[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fxLN3MUwXCdr5RPjwZYIDpOj8CHyjOmngWTgoKXPtZbg":3,"$f-uSzeKBUDkAuwCnDPiAPMe-abE2_8yZwNTLLTs_-9Cw":36,"$f3Ft0rKFJHppdzE-vuveecxx1BUcg9iOlMLtyzf_MJDg":308,"$fucxFBm2ZjZfGSdmdRaSNGBI_F0jJme4f0GTvzUhQfL8":370},[4,8,12,16,20,24,28,32],{"title":5,"slug":6,"path":7},"About Microbeonline.com","about-microbeonline-com","\u002Fabout-microbeonline-com\u002F",{"title":9,"slug":10,"path":11},"About Me","about-me","\u002Fabout-microbeonline-com\u002Fabout-me\u002F",{"title":13,"slug":14,"path":15},"Advertise with Us","advertise-us","\u002Fadvertise-us\u002F",{"title":17,"slug":18,"path":19},"Privacy Policy","privacy-policy","\u002Fprivacy-policy\u002F",{"title":21,"slug":22,"path":23},"Authors","authors","\u002Fauthors\u002F",{"title":25,"slug":26,"path":27},"Microbes","microbes","\u002Fmicrobes\u002F",{"title":29,"slug":30,"path":31},"Books","recommended-books","\u002Frecommended-books\u002F",{"title":33,"slug":34,"path":35},"Tags","tags","\u002Ftags\u002F",{"type":37,"data":38},"blog",{"slug":39,"title":40,"description":41,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":44,"lastUpdatedDate":44,"draft":45,"category":46,"image":42,"body":47,"faq":48,"commentsClosed":45,"tags":73,"related":74,"comments":304},"thermocycler-pcr-machine-parts-working","Thermocycler (PCR Machine): Parts, Working, and Settings","\u003Cp>How a thermocycler runs PCR: its parts, the Peltier block and heated lid, why ramp rate and gradient settings change your result, and common errors.\u003C\u002Fp>",null,"Acharya Tankeshwar","2026-09-10",false,"lab-equipment","Before this machine existed, running a PCR meant standing at the bench moving a rack of tubes between three water baths by hand, over and over, for hours. Worse, the early DNA polymerase was destroyed by the heat of every denaturation step, so a technician had to lift each lid and pipette in fresh enzyme at the start of every single cycle.\n\nThirty cycles meant thirty rounds of manual pipetting into open, contamination-prone tubes. The first attempt to automate this, a prototype nicknamed \"Mr. Cycle,\" was little more than hoses feeding water baths.\n\nTwo things fixed this. First, a heat-stable enzyme, *Taq* polymerase from the hot-spring bacterium *Thermus aquaticus*, which survives the 95°C denaturation step, so it can be added once at the start instead of every cycle.\n\nSecond, a machine that changes its own temperature on a schedule: the thermocycler. Understanding the thermocycler is really about understanding what those temperature changes have to do, and why three settings on the machine, the **heated lid, the ramp rate, and the gradient**, decide whether you get a clean result or a blank gel.\n\n## What Is a Thermocycler?\n\nA thermocycler (also called a thermal cycler, PCR machine, or DNA amplifier) is the instrument that runs the [polymerase chain reaction (PCR)](https:\u002F\u002Fmicrobeonline.com\u002Fpolymerase-chain-reaction-pcr-steps-types-applications\u002F). Its whole job is to hold a set of reaction tubes and take them through a precise, repeated sequence of temperatures, cycle after cycle, with no human intervention.\n\n\u003Cfigure>\n\u003Cimg src=\"https:\u002F\u002Fassets.microbeonline.com\u002Fblogs\u002Fpcr-cycle-temperature-profile.png\" alt=\"Temperature-versus-time graph of one PCR cycle showing denaturation at 95C, annealing near 55C, and extension at 72C, with the sloped ramp segments between the plateaus highlighted\" width=\"1653\" height=\"952\" draggable=\"false\" contenteditable=\"false\">\u003Cfigcaption>Figure:One PCR cycle as the thermocycler runs it. The sloped segments between the flat holds are the ramps; ramp rate is how steep they are.\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\nEach PCR cycle needs three temperatures in order:\n\n- **Denaturation (\\~94–95°C):** the double-stranded DNA is split into two single strands.\n- **Annealing (\\~50–65°C):** short primers bind to their matching sequence on each strand.\n- **Extension (\\~72°C):** *Taq* polymerase builds a new complementary strand from each template.\n\nThe thermocycler repeats this loop 25–40 times. Because each cycle doubles the target, a single starting molecule becomes over a billion copies in a couple of hours.\n\nIn the clinical laboratory this is how a pathogen's genetic material is amplified from a patient sample until there is enough to detect, which is the basis of molecular diagnostics for organisms that are slow or impossible to culture ([*Mycobacterium tuberculosis*](https:\u002F\u002Fmicrobeonline.com\u002Fmycobacterium-tuberculosis\u002F), many viruses, *Bordetella pertussis*, and more).\n\n**The machine does not \"do\" PCR chemistry. It only controls temperature.** Everything biological happens in the tube; the thermocycler's only skill is reaching each temperature quickly, holding it accurately, and moving to the next one on schedule. Keep that in mind, because it explains every part and every setting that follows.\n\n## Principle: How a Thermocycler Heats and Cools Itself\n\nThe heart of a modern thermocycler is the **Peltier element** (a thermoelectric module) sitting under the metal sample block.\n\n\u003Cfigure>\n\u003Cimg src=\"https:\u002F\u002Fassets.microbeonline.com\u002Fblogs\u002Fpeltier-block-mechanism.png\" alt=\"Cross-section of a thermocycler showing a Peltier element heating and cooling the metal thermal block beneath the sample tubes, with current reversed between the heating and cooling states\" width=\"1554\" height=\"1012\" draggable=\"false\" contenteditable=\"false\">\u003Cfigcaption>Figure:How a Peltier element works: passing current one way heats the block, reversing it cools the block, so a single solid-state device drives every temperature step.\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\nA Peltier element is a solid-state device made of two dissimilar semiconductors. When current passes through it in one direction, one face heats up and the other cools down. Reverse the current, and heating and cooling swap faces.\n\nThere are no moving parts and no water baths: the same small device both heats and cools the block simply by switching the direction of the current. This is why a thermocycler can jump from 95°C down to 55°C and back up to 72°C in a controlled, repeatable way.\n\nThe block itself is usually **aluminum** (good heat conduction, affordable) or, in high-end instruments, **silver** (even faster and more uniform, gold-plated to stop corrosion). The better the block conducts heat, the faster and more evenly every well reaches the target temperature.\n\n## Parts of a Thermocycler\n\n**Thermal (sample) block** The metal block with wells that hold the reaction tubes or plate. Common formats are 96-well and 384-well; smaller personal cyclers may hold fewer. The block is what actually heats and cools, so its material and design decide speed and uniformity.\n\n**Peltier element (thermoelectric module)** Sits beneath the block and drives both heating and cooling by switching current direction, as described above. This is the component that replaced the old water baths.\n\n**Heated lid (hot bonnet)** A heated plate that presses down onto the tube caps or the sealing film. It does two things: it applies force to seal the tubes, and it keeps the top of each tube hot (usually \\~100–105°C). This matters more than students expect, and it is covered in its own section below.\n\n**Control panel \u002F interface** Where you program the temperatures, hold times, number of cycles, ramp rates, and lid temperature. Modern cyclers store protocols and show the run on a touchscreen.\n\n**Internal control system** Temperature sensors and the controller that regulate the Peltier elements and the lid heater, and that flag faults on screen.\n\n## The Three Settings That Decide Your Result\n\nA thermocycler has few settings, but three of them silently change whether PCR works.\n\n### 1. The heated lid: why your tubes must not lose water\n\nDuring a run, the block sits near 95°C for long stretches. Water inside an open-topped or poorly heated tube evaporates, rises, and condenses on the cooler cap. That lost water concentrates your reactants and can wreck the reaction, and the condensation itself changes the volume.\n\nThe heated lid solves this by keeping the cap as hot as the reaction, so water has nowhere cooler to condense. It also presses the caps down to seal them. **If the heated lid is switched off or set wrong, you can get failed or inconsistent reactions purely from evaporation, with nothing wrong in your chemistry at all.** This is a classic \"the PCR failed but my recipe was fine\" cause.\n\n### 2. Ramp rate: how fast the machine changes temperature\n\nThe **ramp rate** is how quickly the block moves between temperatures, in °C per second. It is not the same as the hold temperature; it is the *slope* between holds.\n\nRamp rate is not just about speed. It can change your result. A slower ramp means the sample spends longer passing through intermediate temperatures on its way to the annealing target, which can let primers bind to the wrong place and produce extra, unwanted bands.\n\nResearchers have reported that the identical reaction run on two thermocyclers with different ramp rates gives different band patterns, one clean, one smeared, with everything else held constant. If you move a working protocol to a new machine and the result changes, a different ramp rate is a prime suspect.\n\n### 3. Gradient function: finding the right annealing temperature fast\n\nThe best annealing temperature for a new primer pair is not always obvious, and testing one temperature per run is slow. A **gradient thermocycler** applies a range of temperatures across the block at once (cooler at one end, warmer at the other), so a single run tests, say, 55°C through 65°C across the rows. You read the gel, see which temperature gave the cleanest band, and lock it in.\n\nOne honest limitation students should know: most gradient blocks are controlled by only two heating\u002Fcooling elements, one at each end, so the spread across the block is not a perfectly even (\"linear\") gradient. The two end temperatures are exact; the middle rows follow a slightly curved distribution. It is excellent for *finding the right ballpark* annealing temperature, not for claiming an exact temperature in a middle row.\n\n## Operation of a Thermocycler\n\n1. Prepare your PCR reaction mix and aliquot it into thin-walled PCR tubes, strips, or a plate.\n2. Seat the tubes fully into the block wells so each tube bottom contacts the metal. Poor contact means poor heat transfer and uneven results.\n3. Close the heated lid until it seats against the caps.\n4. Program (or load) the protocol: initial denaturation, then the cycle of denaturation \u002F annealing \u002F extension with the correct temperatures, hold times, and cycle number, then a final extension and a hold (often 4°C).\n5. Set the **lid temperature** on (typically \\~105°C) and set the **ramp rate** if your protocol specifies one.\n6. Start the run and let it complete. Retrieve tubes for the next step (gel electrophoresis, sequencing, or detection).\n\n## Types of Thermocycler\n\n**Conventional (end-point) thermocycler** Runs the cycles and stops. You detect the product afterward, usually on a gel. This is the basic machine.\n\n**Gradient thermocycler** A conventional cycler with the added ability to apply a temperature range across the block, used to optimize annealing temperature (see above).\n\n**Real-time thermocycler (qPCR machine)** Has an optical system that reads fluorescence from each well *during* the run, so the amount of product is measured cycle by cycle, no gel needed. This is the basis of [real-time PCR (qPCR)](https:\u002F\u002Fmicrobeonline.com\u002Freal-time-pcr-principles-and-applications\u002F), widely used in clinical diagnostics for quantifying viral load and detecting pathogens.\n\n**RT-PCR thermocycler** Runs [reverse-transcription PCR](https:\u002F\u002Fmicrobeonline.com\u002Frt-pcr-principles-applications\u002F), where an initial step converts RNA to cDNA before amplification. Note the acronym trap: **RT-PCR** (reverse transcription) and **real-time PCR** (qPCR) are different things, though a single instrument can often do both.\n\n## Handling and Maintenance\n\n**Keep the block clean and its wells clear.** Spilled reaction mix in a well ruins heat contact for that position. Clean wells with the manufacturer-recommended method; do not gouge them.\n\n**Verify block temperature periodically.** Blocks drift over time. A temperature-verification kit or a vendor validation check confirms the block still reaches and holds the set temperatures. Uneven wells are a real cause of \"some samples worked, some didn't.\"\n\n**Keep vents and exterior clean.** The instrument sheds heat through vents; blocked vents cause overheating and errors.\n\n**Use the right consumables.** Tubes and plates must fit the block format and tolerate the heated lid. The wrong plastic deforms under the lid and breaks the seal.\n\n**Common on-screen faults.** Messages like a \"room error\" (ambient temperature out of range) or a lid\u002Fblock sensor fault usually mean the machine cannot reach or trust a temperature. The first step is almost always to power-cycle the unit and check the manual; persistent faults need service.\n\n## How to Remember\n\n**The machine only changes temperature; the tube does the biology.** Every part exists to hit a temperature fast, hold it accurately, and move on. If you remember that, the parts explain themselves.\n\n**Heated lid = no evaporation.** Cap stays as hot as the reaction, so water cannot condense on it. Lid off or wrong is a silent PCR killer with a perfectly good recipe.\n\n**Ramp rate is the slope, not the stop.** It is how fast the machine travels between temperatures, and a different ramp rate on a new machine can change your bands even when everything else is identical.\n\n**Gradient finds the annealing temperature; it does not certify a middle-row exact value.** Great for optimization, not for claiming a precise mid-block temperature.\n\n## Key Exam Facts\n\n| Fact | Detail |\n| --- | --- |\n| What it is | Instrument that runs PCR by cycling temperatures automatically |\n| Also called | Thermal cycler, PCR machine, DNA amplifier |\n| Core principle | Peltier element heats and cools the block by switching current direction |\n| Block material | Aluminum (standard) or silver (faster, more uniform, gold-plated) |\n| Three PCR temperatures | Denaturation \\~95°C, annealing \\~50–65°C, extension \\~72°C |\n| Heated lid (hot bonnet) purpose | Prevents evaporation\u002Fcondensation and seals tube caps |\n| Ramp rate | Speed of temperature change (°C\u002Fs); can alter band pattern |\n| Gradient function | Range of temperatures across block to optimize annealing temp |\n| Real-time (qPCR) cycler | Reads fluorescence during the run; no gel needed |\n| RT-PCR vs real-time PCR | RT = reverse transcription (RNA→cDNA); real-time = qPCR; not the same |\n| Common formats | 96-well, 384-well |\n| Clinical use | Amplifies pathogen nucleic acid for molecular diagnosis |\n\n## Where Students Get Confused\n\n**\"Thermocycler\" and \"PCR\" are not the same thing.** PCR is the *technique* (the biochemistry of amplifying DNA). The thermocycler is the *instrument* that provides the temperature schedule PCR needs. The tube does the reaction; the machine only manages temperature.\n\n**RT-PCR versus real-time PCR.** RT-PCR means reverse-transcription PCR (starting from RNA). Real-time PCR means qPCR (product measured during the run). They share the letters \"RT\" in speech but mean different things. One instrument may do both, which adds to the confusion.\n\n**The heated lid is not optional decoration.** Its job is to stop evaporation and condensation. Switching it off, or a poor seal, concentrates the reaction and can cause failure with no fault in the chemistry.\n\n**Ramp rate can change results, not just run time.** Students assume a faster or slower ramp only changes how long the run takes. It can also change which products form, which is why a validated protocol can behave differently on a new machine.\n\n**A gradient block is not a perfectly even gradient.** The two end temperatures are exact; the middle rows follow a curved distribution because only two elements control the spread. Use it to find the best annealing temperature, not to certify an exact mid-block value.\n\n**A blank gel is not always \"bad PCR.\"** Before blaming reagents, check the machine: lid off, wrong ramp, a well with poor tube contact, or a block that has drifted out of calibration all produce failures that look like chemistry problems.\n\n**References**\n\n- Tille, P. M. (2022). *Bailey & Scott's Diagnostic Microbiology* (15th ed.). Elsevier.\n- Sambrook, J., & Green, M. R. (2012). *Molecular Cloning: A Laboratory Manual* (4th ed.). Cold Spring Harbor Laboratory Press.\n- Cheesbrough, M. (2006). *District Laboratory Practice in Tropical Countries, Part 2* (2nd ed.). Cambridge University Press.\n- Thermo Fisher Scientific (2021). Six Key Considerations for Selecting a PCR Thermal Cycler. Molecular Biology Resource Library. \u003Chttps:\u002F\u002Fwww.thermofisher.com\u002F>",[49,52,55,58,61,64,67,70],{"question":50,"answer":51},"\u003Cp>What is a thermocycler used for?\u003C\u002Fp>","\u003Cp>A thermocycler runs the polymerase chain reaction (PCR). It holds reaction tubes and takes them through repeated cycles of heating and cooling, denaturation at about 95°C, annealing at about 50–65°C, and extension at about 72°C, so that a target piece of DNA is copied over and over into millions of copies. In clinical microbiology this is how a pathogen's genetic material is amplified from a patient sample until there is enough to detect.\u003C\u002Fp>",{"question":53,"answer":54},"\u003Cp>Is a thermocycler the same as a PCR machine?\u003C\u002Fp>","\u003Cp>Yes. \"Thermocycler,\" \"thermal cycler,\" \"PCR machine,\" and \"DNA amplifier\" all name the same instrument. Note that the instrument is not the same as PCR itself: PCR is the technique, and the thermocycler is the machine that provides the temperature cycling the technique requires.\u003C\u002Fp>",{"question":56,"answer":57},"\u003Cp>How does a thermocycler heat and cool so quickly?\u003C\u002Fp>","\u003Cp>Most modern thermocyclers use a Peltier element, a solid-state device that heats on one face and cools on the other depending on the direction of the current. Reversing the current swaps heating and cooling, so the same device can drive the block up to 95°C and back down to 55°C without water baths or moving parts. Silver blocks change temperature faster and more evenly than aluminum ones.\u003C\u002Fp>",{"question":59,"answer":60},"\u003Cp>What is the heated lid on a thermocycler for?\u003C\u002Fp>","\u003Cp>The heated lid keeps the top of each tube as hot as the reaction below, so water cannot evaporate and condense on the cap during the long high-temperature steps. It also presses the caps down to seal them. If the heated lid is off or set incorrectly, evaporation can concentrate the reaction and cause it to fail even when the chemistry is correct.\u003C\u002Fp>",{"question":62,"answer":63},"\u003Cp>Does ramp rate affect PCR results?\u003C\u002Fp>","\u003Cp>Yes. Ramp rate is how fast the machine moves between temperatures. A slower ramp keeps the sample longer at intermediate temperatures, which can let primers bind non-specifically and produce extra bands. Running the same reaction on two machines with different ramp rates can give different results, so ramp rate is a common reason a working protocol behaves differently on a new instrument.\u003C\u002Fp>",{"question":65,"answer":66},"\u003Cp>What is a gradient thermocycler?\u003C\u002Fp>","\u003Cp>A gradient thermocycler applies a range of temperatures across the block in a single run, cooler at one end and warmer at the other. This lets you test several annealing temperatures at once and pick the one that gives the cleanest product, instead of running many separate PCRs. The two end temperatures are exact, but the middle rows are not perfectly evenly spaced, so a gradient is best for finding the right annealing temperature rather than certifying an exact middle value.\u003C\u002Fp>",{"question":68,"answer":69},"\u003Cp>What is the difference between RT-PCR and real-time PCR?\u003C\u002Fp>","\u003Cp>RT-PCR stands for reverse-transcription PCR, which begins by converting RNA into cDNA before amplifying it. Real-time PCR (qPCR) measures the amount of product during the run using fluorescence, with no gel needed afterward. They are different things despite the similar names, though one instrument can often perform both.\u003C\u002Fp>",{"question":71,"answer":72},"\u003Cp>Why did my PCR give a blank gel when my reagents were fine?\u003C\u002Fp>","\u003Cp>Before blaming the chemistry, check the machine. A heated lid that was off, a ramp rate that differs from your validated protocol, a well where the tube did not seat properly, or a block that has drifted out of calibration can all cause a failed run that looks like a reagent problem. Verifying the block temperature and confirming the lid and ramp settings often solves it.\u003C\u002Fp>",[],[75,104,138,161,183,216,241,271],{"slug":76,"title":77,"description":78,"seoTitle":79,"seoDescription":80,"author":43,"createdDate":81,"lastUpdatedDate":82,"draft":45,"category":46,"image":42,"faq":83,"tags":102},"polymerase-chain-reaction-pcr-steps-types-applications","Polymerase Chain Reaction (PCR): Steps, Types, and Applications","PCR amplifies DNA exponentially in three steps: denaturation, annealing, and extension. Learn the components, steps, types: nested, multiplex, real-time, RT-PCR and clinical applications in diagnostic microbiology.","PCR: Steps, Reagents, Result Interpretation, and Applications","Review PCR reagents and the denaturation, annealing, and extension cycle, then compare major PCR variants, controls, interpretation, and applications.","2016-07-07","2026-09-06",[84,87,90,93,96,99],{"question":85,"answer":86},"What is polymerase chain reaction (PCR) and what does it do?","\u003Cp>Polymerase chain reaction (PCR) is an in vitro molecular technique that amplifies a specific DNA or RNA sequence exponentially, producing up to 10 million copies from a single starting template within a few hours. It works by repeatedly cycling through three temperature-controlled steps (denaturation, annealing, and extension), using a heat-stable DNA polymerase (Taq polymerase) and short synthetic primers that define the target sequence. In clinical microbiology, PCR directly detects a pathogen's nucleic acid in a patient specimen, regardless of whether the organism is alive, cultivable, or present in small quantities.\u003C\u002Fp>",{"question":88,"answer":89},"What are the three steps of PCR and what temperature is used for each?","\u003Cp>PCR has three steps that repeat in each cycle. Denaturation occurs at 94–96°C, heat breaks the hydrogen bonds between the two DNA strands, separating them into single-stranded templates. Annealing occurs at 45–65°C, the temperature is lowered so primers can bind to their complementary sequences on each strand. Extension occurs at 72°C, Taq polymerase synthesizes a new complementary DNA strand starting from each primer. After 30–40 cycles, the target sequence is amplified by a factor of approximately 10 million.\u003C\u002Fp>",{"question":91,"answer":92},"What is Taq polymerase and why is it used in PCR?","\u003Cp>Taq polymerase is a thermostable DNA polymerase originally isolated from Thermus aquaticus, a bacterium that lives in boiling hot springs. Its defining property is heat stability, it remains active at 72°C and survives the 94°C denaturation step without being destroyed. This allows automated PCR cycling without adding fresh enzyme after every cycle. Without a heat-stable polymerase, PCR as an automated process would not be possible.\u003C\u002Fp>",{"question":94,"answer":95},"What is the difference between RT-PCR and real-time PCR?","\u003Cp>These two terms describe different aspects of PCR and are frequently confused. RT-PCR (reverse transcriptase PCR) refers to the template type: it adds a reverse transcription step that converts RNA into complementary DNA before amplification, making it possible to detect RNA viruses such as HIV, hepatitis C, dengue, and SARS-CoV-2. Real-time PCR (quantitative PCR or qPCR) refers to the detection method: fluorescence is measured during each amplification cycle, allowing quantitation of the target. A test can be both simultaneously: the COVID-19 PCR test is technically RT-qPCR, using reverse transcriptase for the RNA template and real-time detection for quantitation.\u003C\u002Fp>",{"question":97,"answer":98},"When should nested PCR be used instead of standard PCR?","\u003Cp>Nested PCR should be used when the target organism is present in very low quantities, below the detection threshold of standard single-round PCR. It uses two successive PCR reactions with two primer sets: outer primers amplify a large fragment first, then inner (nested) primers amplify a smaller specific region within that product. The double amplification dramatically increases sensitivity. Clinical applications include detection of \u003Cem>Rickettsia\u003C\u002Fem> and \u003Cem>Bartonella\u003C\u002Fem> in blood, \u003Cem>M. tuberculosis\u003C\u002Fem> in paucibacillary samples, herpesviruses and enteroviruses in CSF, and \u003Cem>Leishmania\u003C\u002Fem> in tissue.\u003C\u002Fp>",{"question":100,"answer":101},"What are the advantages of PCR over culture in clinical microbiology?","\u003Cp>PCR offers four key advantages over culture. Speed: results in hours rather than days: TB culture takes 6–8 weeks; PCR confirms TB the same day. Sensitivity: detects as few as 1–10 DNA copies per reaction, far below the threshold for culture positivity. Specificity: primers target a defined sequence, identifying the exact organism or resistance gene rather than just confirming growth. Versatility: works on organisms that cannot be cultured (many viruses, some parasites), on degraded specimens (formalin-fixed tissue, dried blood), and on samples with mixed flora where culture is uninterpretable.\u003C\u002Fp>",[103],"pcr-techniques",{"slug":105,"title":106,"description":107,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":108,"lastUpdatedDate":109,"draft":45,"category":110,"image":42,"faq":111,"tags":136},"mycobacterium-tuberculosis","Mycobacterium tuberculosis and Tuberculosis: Pathogenesis, Clinical Disease, and Diagnosis","\u003Cp>How \u003Cem>Mycobacterium tuberculosis \u003C\u002Fem>causes tuberculosis: why it survives inside macrophages, how the granuloma leads to latent and active TB, the clinical picture, drug-resistant TB, and how TB is diagnosed.\u003C\u002Fp>","2026-08-06","2026-09-05","bacteriology",[112,115,118,121,124,127,130,133],{"question":113,"answer":114},"\u003Cp>How does \u003Cem>Mycobacterium tuberculosis\u003C\u002Fem> cause disease?\u003C\u002Fp>","\u003Cp>It is inhaled and engulfed by alveolar macrophages, but instead of being killed it survives inside them by blocking the macrophage's killing machinery. The immune system walls it off in structures called granulomas, which contain the infection but also shelter living organisms that can reactivate later.\u003C\u002Fp>",{"question":116,"answer":117},"\u003Cp>What is the difference between latent and active TB?\u003C\u002Fp>","\u003Cp>Latent TB means the organism is present but walled off by the immune system: the person is infected, has a positive tuberculin or IGRA test, but is not ill and not infectious. Active TB means the organism has broken out and is causing disease; pulmonary active TB is infectious.\u003C\u002Fp>",{"question":119,"answer":120},"\u003Cp>Is latent TB contagious?\u003C\u002Fp>","\u003Cp>No. Only active pulmonary or laryngeal TB spreads through the air. People with latent TB do not transmit the organism.\u003C\u002Fp>",{"question":122,"answer":123},"\u003Cp>Why does tuberculosis affect the upper lungs?\u003C\u002Fp>","\u003Cp>Because \u003Cem>M. tuberculosis\u003C\u002Fem> is a strict aerobe and prefers the most oxygen-rich parts of the lung, which are the upper lobes. This is where reactivation TB typically causes cavities.\u003C\u002Fp>",{"question":125,"answer":126},"\u003Cp>Why does TB treatment take so many months and so many drugs?\u003C\u002Fp>","\u003Cp>Because the organism grows slowly, survives inside cells, and lies dormant in granulomas, so it cannot be cleared quickly. Several drugs are given together for months. Using one drug or stopping early causes relapse and drug resistance.\u003C\u002Fp>",{"question":128,"answer":129},"\u003Cp>What is MDR-TB?\u003C\u002Fp>","\u003Cp>Multidrug-resistant TB is tuberculosis resistant to at least isoniazid and rifampicin, the two most important first-line drugs. It needs longer treatment with more toxic second-line drugs. It arises mainly from incomplete or improper treatment.\u003C\u002Fp>",{"question":131,"answer":132},"\u003Cp>What is the Ghon complex?\u003C\u002Fp>","\u003Cp>The combination of the initial lung lesion of primary TB plus the involved draining lymph node. It is the pathological hallmark of primary (first-time) tuberculosis infection.\u003C\u002Fp>",{"question":134,"answer":135},"\u003Cp>Does the BCG vaccine prevent tuberculosis?\u003C\u002Fp>","\u003Cp>BCG mainly protects young children against the severe forms of TB (miliary TB and TB meningitis). Its protection against adult pulmonary TB is variable, so it does not reliably prevent the common adult form.\u003C\u002Fp>",[137],"mycobacteria",{"slug":139,"title":140,"description":141,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":142,"lastUpdatedDate":143,"draft":45,"category":46,"image":42,"faq":144,"tags":160},"real-time-pcr-principles-and-applications","Real-time PCR (qPCR): Principles and Applications","Real-time PCR (qPCR) amplifies and quantifies DNA simultaneously using fluorescent probes. Learn SYBR Green vs TaqMan, Ct values, and clinical uses in viral load testing.","2019-12-26","2026-07-05",[145,148,151,154,157],{"question":146,"answer":147},"What is the Ct value in real-time PCR and how is it interpreted?","The Ct value (cycle threshold) is the PCR cycle number at which the fluorescent signal from the reaction crosses a pre-set detection threshold. It is inversely proportional to the amount of starting template: a sample with high viral load reaches the threshold in fewer cycles (low Ct value), while a sample with low viral load requires more cycles (high Ct value). In HIV viral load monitoring, a Ct of approximately 20 corresponds to a high viral load, while a Ct above 34 indicates very low or undetectable levels. An important caveat: Ct values are not directly comparable between different assays, instruments, or laboratories.",{"question":149,"answer":150},"What is the difference between SYBR Green and TaqMan probes in real-time PCR?","SYBR Green is a fluorescent dye that binds to any double-stranded DNA and fluoresces — it is non-specific, detecting all amplification products including primer dimers and non-specific products. It is cheaper and simpler but requires melting curve analysis to confirm the correct product was amplified. TaqMan probes are sequence-specific — a labelled probe complementary to an internal target sequence is cleaved by Taq polymerase during extension, releasing a fluorescent reporter only when the correct sequence is amplified. TaqMan is more specific, suitable for multiplex detection, and is the standard for clinical diagnostic assays. SYBR Green is used in research settings where cost matters and melting curve verification is feasible.",{"question":152,"answer":153},"How does real-time PCR differ from conventional PCR?","In conventional PCR, amplification and detection are separate steps — the tube is opened after cycling and products are detected by gel electrophoresis. In real-time PCR, amplification and detection occur simultaneously in a closed tube — fluorescence is measured after each cycle as amplicon accumulates. The closed-tube design eliminates post-PCR handling and the carry-over contamination risk it creates. Real-time PCR is also quantitative, measuring the amount of starting template, while conventional PCR is qualitative (presence or absence only). Real-time PCR is faster because no gel electrophoresis step is required.",{"question":155,"answer":156},"What are the clinical applications of real-time PCR in microbiology?","Real-time PCR is used for viral load quantification — HIV, HCV, HBV, and CMV monitoring in transplant patients all rely on qPCR to measure virus copy numbers and guide treatment decisions. It is used for COVID-19 (SARS-CoV-2) detection, TB quantification, and diagnosis of infections where pathogen load correlates with disease severity or treatment response. It is also used for SNP detection, allelic discrimination, and — when combined with reverse transcription — for mRNA expression analysis and RNA virus detection.",{"question":158,"answer":159},"Why is real-time PCR preferred over conventional PCR in clinical diagnostic laboratories?","Real-time PCR is preferred for three reasons. First, the closed-tube format eliminates post-PCR amplicon manipulation, dramatically reducing the risk of carry-over contamination that causes false positives — a major problem in high-throughput diagnostic laboratories. Second, it is quantitative, providing viral load or copy number data that guides clinical decisions such as when to start or switch antiviral therapy. Third, it is faster — results are available in 1–3 hours compared to 4–6 hours for conventional PCR followed by gel electrophoresis.",[103],{"slug":162,"title":163,"description":164,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":165,"lastUpdatedDate":143,"draft":45,"category":46,"image":42,"faq":166,"tags":182},"rt-pcr-principles-applications","Reverse transcriptase (RT)-PCR: Principles, Applications","RT-PCR converts RNA to cDNA using reverse transcriptase before PCR amplification. Learn one-step vs two-step methods, primer types, and clinical uses in RNA virus detection.","2019-12-16",[167,170,173,176,179],{"question":168,"answer":169},"What does reverse transcriptase PCR (RT-PCR) detect that standard PCR cannot?","RT-PCR detects RNA targets — standard PCR cannot, because it requires a DNA template. RT-PCR adds a reverse transcription step before amplification: the enzyme reverse transcriptase converts single-stranded RNA into complementary DNA (cDNA), which is then amplified by standard PCR. This makes RT-PCR essential for detecting RNA viruses — HIV, hepatitis C, dengue, influenza, SARS-CoV-2, enteroviruses, and West Nile virus all have RNA genomes. RT-PCR can also detect bacterial and parasitic rRNA, and is used to study mRNA gene expression.",{"question":171,"answer":172},"What is the difference between one-step and two-step RT-PCR?","In one-step RT-PCR, reverse transcription and PCR amplification occur in the same tube using a single reaction buffer and gene-specific primers. This minimises sample handling, reduces contamination risk, and is faster — making it the preferred format for clinical diagnostics where a single RNA target needs detection. In two-step RT-PCR, reverse transcription is performed in a first reaction to generate cDNA, which is then stored and used as template for subsequent PCR reactions. This is slower and requires more handling, but the cDNA can be used to amplify multiple different gene targets — making it the preferred format for research and gene expression studies.",{"question":174,"answer":175},"What types of primers are used for cDNA synthesis in RT-PCR?","Three primer types are used for the reverse transcription step. Random hexamers are mixtures of all possible six-nucleotide combinations that bind randomly to any RNA and generate cDNA from the entire RNA pool. Oligo-dT primers are complementary to the poly-A tail present on mRNA molecules, producing cDNA from mRNA only. Gene-specific primers bind selectively to the mRNA of interest, making reverse transcription a targeted process. Random hexamers give the broadest coverage; oligo-dT targets mRNA specifically; gene-specific primers are the most restricted and most targeted.",{"question":177,"answer":178},"Why does RT-PCR detect viable organisms better than standard DNA PCR?","DNA is chemically stable and persists in dead cells for extended periods after an organism has been killed — meaning standard PCR can return a positive result from non-viable organisms weeks after successful treatment. RNA, by contrast, degrades rapidly after cell death because RNA molecules are intrinsically unstable and are immediately targeted by cellular RNases when the organism dies. Detecting rRNA by RT-PCR therefore indicates the presence of metabolically active, viable organisms. This makes RT-PCR targeting rRNA more informative than DNA PCR when assessing treatment response or distinguishing active infection from residual nucleic acid.",{"question":180,"answer":181},"What is RT-qPCR and how does it differ from RT-PCR?","RT-qPCR (reverse transcriptase quantitative PCR) combines two methods: the reverse transcription step of RT-PCR (converting RNA to cDNA) with the real-time fluorescent detection of qPCR (measuring amplification during each cycle). RT-PCR alone detects presence or absence of an RNA target qualitatively. RT-qPCR quantifies how much RNA is present — expressed as copy number or viral load. HIV viral load and HCV viral load assays are RT-qPCR: they use reverse transcriptase because the targets are RNA viruses, and real-time detection to quantify the viral load for treatment monitoring.",[103],{"slug":184,"title":185,"description":186,"seoTitle":187,"seoDescription":42,"author":188,"createdDate":189,"lastUpdatedDate":109,"draft":45,"category":46,"image":42,"faq":190,"tags":215},"ph-meter-parts-principle-and-applications","pH Meter: Parts, Working Principle, Labeled Diagram, and Applications","\u003Cp>What a pH meter is made of, how the glass electrode turns voltage into pH, a labeled diagram, its types, and where it is used in the lab.\u003C\u002Fp>","","Samikshya Acharya","2022-10-20",[191,194,197,200,203,206,209,212],{"question":192,"answer":193},"\u003Cp>What are the main parts of a pH meter?\u003C\u002Fp>","\u003Cp>A pH meter has three functional parts: a glass (measuring) electrode with a thin pH-sensitive bulb, a reference electrode that holds a stable potential, and a meter that reads the voltage between them and displays the pH. In most modern meters the glass and reference electrodes are built into a single combination electrode, often with a temperature sensor included.\u003C\u002Fp>",{"question":195,"answer":196},"\u003Cp>What is the working principle of a pH meter?\u003C\u002Fp>","\u003Cp>The pH-sensitive glass bulb develops a small voltage (a boundary potential) when the hydrogen ion activity of the sample differs from that of the fixed buffer inside the bulb. The meter measures this voltage against the stable reference electrode and converts it to a pH value using the Nernst equation. Hydrogen ions do not pass through the glass; it is the difference in H⁺ activity on the two sides that produces the voltage.\u003C\u002Fp>",{"question":198,"answer":199},"\u003Cp>What are the types of pH meter?\u003C\u002Fp>","\u003Cp>By portability they are grouped as pen (pocket) meters, handheld or portable meters, and benchtop meters. By use they are laboratory meters and industrial online meters. Benchtop laboratory meters give the most accurate readings, while pen meters are the cheapest and most convenient for quick field checks.\u003C\u002Fp>",{"question":201,"answer":202},"\u003Cp>Where is a pH meter used?\u003C\u002Fp>","\u003Cp>In water quality testing, clinical and biological fluid analysis, soil and agriculture, food and beverage production, industrial process control, and in microbiology laboratories to prepare and quality-check culture media and reagents at an exact pH.\u003C\u002Fp>",{"question":204,"answer":205},"\u003Cp>How is a pH meter used in microbiology?\u003C\u002Fp>","\u003Cp>Culture media must be adjusted to a defined pH, usually near neutral, before sterilization, because growth and test results are sensitive to it. For example, Mueller-Hinton medium is standardized to pH 7.3 plus or minus 0.1 at 25°C. The pH meter is used both to adjust media during preparation and to verify pH during quality control.\u003C\u002Fp>",{"question":207,"answer":208},"\u003Cp>Why does a pH meter need to be calibrated with two buffers instead of one?\u003C\u002Fp>","\u003Cp>The meter converts voltage to pH using a straight line defined by an offset and a slope. A single buffer (pH 7) only sets the offset (the zero point). A second buffer sets the slope. Two points are needed to define the line, so one-point calibration leaves readings away from pH 7 unreliable.\u003C\u002Fp>",{"question":210,"answer":211},"\u003Cp>How should I store the electrode?\u003C\u002Fp>","\u003Cp>In its storage solution, usually pH 4 buffer or 3M potassium chloride. Never store it dry, because the glass bulb loses response when it dehydrates, and never store it long-term in deionized or distilled water, because pure water leaches ions out of the electrode and degrades it. If an electrode dries out, soak it overnight in storage solution before use.\u003C\u002Fp>",{"question":213,"answer":214},"\u003Cp>Why is my pH reading drifting and not stabilizing?\u003C\u002Fp>","\u003Cp>Most often the electrode, not the meter. A dirty or aging glass bulb or a clogged reference junction causes drift; clean the electrode and recalibrate, and check whether the slope has dropped below 95 percent. Very pure or poorly buffered samples also drift by nature and need gentle stirring and extra time\u003C\u002Fp>",[],{"slug":217,"title":218,"description":219,"seoTitle":42,"seoDescription":42,"author":220,"createdDate":221,"lastUpdatedDate":222,"draft":45,"category":46,"image":42,"faq":223,"tags":239},"pocket-microscope-parts-working-principle-and-uses","Pocket Microscope: Parts, Working Principle, and Uses","\u003Cp>A pocket microscope is a small optical microscope you look through with your eye, magnifying about 20x to 250x. Here is how it works, its parts, its uses, and how it differs from a handheld digital microscope.\u003C\u002Fp>","Ashma Shrestha","2022-08-19","2026-08-18",[224,227,230,233,236],{"question":225,"answer":226},"\u003Cp>What is a small handheld microscope called?\u003C\u002Fp>","\u003Cp>A small handheld microscope that you look through with your eye is called a pocket microscope, or a field microscope. If it has no eyepiece and shows the image on a phone or computer screen instead, it is a handheld digital microscope, which is a different instrument.\u003C\u002Fp>",{"question":228,"answer":229},"\u003Cp>How does a pocket microscope work?\u003C\u002Fp>","\u003Cp>It works as a high-power magnifier. You hold it over the object with the lens end close to the surface and look through the eyepiece. A lens system produces an enlarged image that the eye views directly, and an LED lights the object, usually by reflected light off the surface.\u003C\u002Fp>",{"question":231,"answer":232},"\u003Cp>What is the difference between a pocket microscope and a handheld digital microscope?\u003C\u002Fp>","\u003Cp>A pocket microscope is optical: you look through an eyepiece. A handheld digital microscope uses an electronic image sensor instead of an eyepiece and shows the image on a screen. Both are small and portable, but the detector is different.\u003C\u002Fp>",{"question":234,"answer":235},"\u003Cp>Can a pocket microscope see bacteria?\u003C\u002Fp>","\u003Cp>No. Its magnification is about 20x to 250x, far below the roughly 1000x with oil immersion needed to see bacteria. A pocket microscope is made for surface detail on coins, insects, plants, and circuit boards, not for stained bacterial slides.\u003C\u002Fp>",{"question":237,"answer":238},"\u003Cp>What magnification pocket microscope should I choose?\u003C\u002Fp>","\u003Cp>For general field and inspection use, about 20x to 40x is easiest, giving a wide, steady view. Higher magnifications (up to 250x) show finer detail but have a very small field and are hard to hold steady by hand.\u003C\u002Fp>",[240],"microscopy",{"slug":242,"title":243,"description":244,"seoTitle":42,"seoDescription":42,"author":220,"createdDate":245,"lastUpdatedDate":246,"draft":45,"category":46,"image":42,"faq":247,"tags":269},"automated-pipette-liquid-handling-system","Automatic Pipette and Liquid Handling System: Parts, Working, Uses","\u003Cp>Automated pipettes use software-controlled robotic arms for precise high-throughput liquid handling. Learn their working principles, parts, benefits, and limitations in microbiology.\u003C\u002Fp>","2022-07-10","2026-09-01",[248,251,254,257,260,263,266],{"question":249,"answer":250},"What is an automated pipette and how does it differ from a manual micropipette?","An automated pipette (also called a liquid handling robot or automated liquid handling system) is a software-controlled instrument where robotic arms aspirate and dispense defined volumes without continuous human intervention. A manual micropipette requires the operator to perform every aspiration, dispensation, tip change, and plate movement individually. Automated systems process more than 100 samples per hour with coefficient of variation values typically below 1%, eliminating fatigue-related error and throughput limitations of manual pipetting.",{"question":252,"answer":253},"What is the difference between semi-automatic and fully automatic pipetting systems?","\u003Cp>Semi-automatic pipetting systems handle aspiration and dispensation mechanically but require human intervention for moving plates or tubes between steps and for changing tips. They process 10–100 samples at a time. \u003C\u002Fp>\u003Cp>\u003C\u002Fp>\u003Cp>Fully automatic (robotic) systems use robotic arms to move plates, change tips, and manage all physical steps. The only human input required is programming the run parameters at the start. Fully automatic systems provide a walk-away facility, allowing the technician to perform other tasks while the system processes samples.\u003C\u002Fp>",{"question":255,"answer":256},"What is acoustic droplet ejection (ADE) and how is it different from standard pipetting?","\u003Cp>Acoustic droplet ejection (ADE) is a contactless pipetting method that uses focused sound energy to eject precise droplets of liquid from a source well up into an inverted target plate, with no tip and no physical contact, and therefore no contamination risk from tip-to-liquid contact. Each acoustic pulse ejects a fixed, very small droplet, on the order of a few nanoliters, and larger volumes are built up by ejecting more droplets. The acoustic power is tuned to the fluid, because viscous or high-surface-tension liquids need more energy to eject a drop. ADE achieves the lowest contamination risk of any liquid transfer method but is also the most expensive, and it is used mainly in high-throughput drug discovery and genomics.\u003C\u002Fp>",{"question":258,"answer":259},"What are the main advantages of automated liquid handling in clinical microbiology?","The main advantages are: higher throughput (>100 samples per hour versus 48–96 by a manual technician), improved reproducibility (identical volume and timing across all samples), reduced fatigue-related error (no drift in technique over long processing sessions), reduced contamination risk (fewer human touchpoints during the run), and walk-away operation (technician time is freed for other tasks). These advantages were demonstrated clearly during the COVID-19 pandemic, when reference laboratories used robotic extraction systems to process hundreds of PCR samples per day.",{"question":261,"answer":262},"Why are automated pipetting systems not commonly used in district-level laboratories in low- and middle-income countries?","\u003Cp>The primary barriers are cost and maintenance. Entry-level automated liquid handling systems cost from approximately $10,000; fully integrated high-throughput platforms cost $150,000 or more. Ongoing maintenance requires trained service engineers, regular calibration, and replacement parts. \u003C\u002Fp>\u003Cp>\u003C\u002Fp>\u003Cp>Most district-level diagnostic laboratories in Nepal, Nigeria, the Philippines, and similar settings rely on manual micropipettes and glass pipettes for routine work, with automation limited to national reference laboratories or large urban hospital laboratories.\u003C\u002Fp>",{"question":264,"answer":265},"\u003Cp>What are the parts of an automatic pipette?\u003C\u002Fp>","\u003Cp>An automatic pipette, or automated liquid handling system, has two levels of parts. The pipetting head is a motorized version of a micropipette, with a piston, shaft, and tip cone, driven by a stepper motor instead of a thumb plunger; it can be single-channel or multichannel. Around it sits the robotic workstation: a robotic arm that moves the head across a deck of labware, a tip-loading and ejection station, liquid-level and tip-presence sensors, an optional wash station on fixed-tip systems, and the control software that stores the protocol and drives the run. During use the operator interacts only with the software.\u003C\u002Fp>",{"question":267,"answer":268},"\u003Cp>How does an automatic pipette work, and how is it different from a manual one?\u003C\u002Fp>","\u003Cp>An automatic pipette uses a motor-driven piston to aspirate and dispense set volumes, and a robotic arm to move plates and change tips, so it can run more than 100 samples per hour without continuous human input once programmed. A manual pipette requires the operator to perform every aspiration, dispensation, tip change, and plate move by hand, one sample at a time. The mechanism of liquid movement is the same in both (usually air displacement, sometimes positive displacement for viscous samples); the difference is that automation replaces the human thumb and hand with a motor and a robotic arm, which raises throughput and reproducibility at the cost of price and maintenance.\u003C\u002Fp>",[270],"pipette",{"slug":272,"title":273,"description":274,"seoTitle":42,"seoDescription":42,"author":275,"createdDate":276,"lastUpdatedDate":277,"draft":45,"category":46,"image":42,"faq":278,"tags":303},"parts-of-microscope-and-their-functions","Parts of a Microscope and Their Functions: Which Objective and Settings for Each Examination","Every part of the compound microscope and what it does, why oil immersion works only at 100X, when to close the iris and when to open it, plus a clinical guide to objectives and settings for Gram stains, wet preps, blood films, and AFB smears","Sushmita Baniya","2022-05-09","2026-09-04",[279,282,285,288,291,294,297,300],{"question":280,"answer":281},"What is the difference between magnification and resolution in a microscope?","\u003Cp>Magnification is how much larger the image appears, which is calculated by multiplying eyepiece by objective magnification. Resolution is the ability to distinguish two adjacent points as separate structures. The resolving power of a light microscope is ~0.2 μm, structures closer than this appear blurred regardless of magnification. Resolution is the more important property for scientific work.\u003C\u002Fp>",{"question":283,"answer":284},"Why can we not see viruses with a light microscope?","\u003Cp>Viruses (20–300 nm) fall below the ~0.2 μm resolution limit of light microscopes. Electron microscopes use electrons with wavelengths of ~0.005 nm (achieving resolutions of 0.1–0.2 nm) sufficient to visualize individual virus particles.\u003C\u002Fp>",{"question":286,"answer":287},"Why is immersion oil used with the 100X objective?","Glass and air have different refractive indices (1.515 vs 1.0), causing light refraction and scatter. Immersion oil (RI 1.515) matches glass, eliminating bending at interfaces and allowing the full numerical aperture of the 100X lens to be used for maximum resolution. Never use 40X or lower with oil.",{"question":289,"answer":290},"What is the correct order of steps when using a compound microscope?","Always start at 4X or 10X. Find and focus the specimen at low power using coarse adjustment. Switch to higher objectives using only fine adjustment. Apply immersion oil before using 100X. Never use the coarse adjustment knob at 40X or 100X.",{"question":292,"answer":293},"What is the function of the condenser?","The condenser collects scattered light from the illuminator and focuses it into a concentrated cone aimed precisely at the specimen. Raise it to its highest position for oil immersion work. Lower slightly for low-power wet preparations to increase contrast.",{"question":295,"answer":296},"What is the function of the iris diaphragm?","\u003Cp>Controls the width of the light cone entering the condenser. For stained preparations at 100X: fully open for maximum resolution. For unstained wet preparations at low power: partially closed to increase contrast. Never use the iris to reduce light intensity for routine work.\u003C\u002Fp>",{"question":298,"answer":299},"What is the difference between a monocular and binocular microscope?","\u003Cp>Monocular: single eyepiece, one eye. Binocular: two eyepieces, both eyes simultaneously. Binocular is strongly preferred for laboratory work as it reduces eye strain, better depth perception. Some microscopes are trinocular: two eyepieces plus a camera\u002Fteaching port.\u003C\u002Fp>",{"question":301,"answer":302},"Why should the coarse adjustment knob never be used with high-power objectives?","The coarse knob moves the stage rapidly. At 40X and 100X, even a small movement can crash the objective into the slide, cracking the coverslip and scratching the lens. Only the fine adjustment knob should be used at 40X and 100X.",[240],{"enabled":305,"threads":306,"total":307},true,[],0,[309,315,321,327,332,337,343,348,354,357,364],{"slug":310,"name":43,"description":311,"image":312,"body":313,"postCount":314},"acharya-tankeshwar","Editor-in-chief","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Ftankeshwar-acharya-author-microbeonline.jpg","***Tankeshwar Acharya, MSc (Medical Microbiology)***\n\n*Tankeshwar Acharya is an Assistant Professor in the Department of Microbiology at Patan Academy of Health Sciences (PAHS), Nepal, where he has been teaching and practicing clinical microbiology for over 14 years. He is the founder of Microbe Online, one of the leading free microbiology education resources on the web, covering bacteriology, mycology, parasitology, immunology, and clinical laboratory diagnostics written from direct experience in both the classroom and the diagnostic laboratory.*",516,{"slug":316,"name":220,"description":317,"image":318,"body":319,"postCount":320},"ashma-shrestha","SEO Copywriter and Science Communicator\nKathmandu, Nepal","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fashma-shrestha.png","Ashma Shrestha holds a Master of Science in Medical Microbiology from the Institute of Science and Technology (IOST), Tribhuvan University, Nepal, where she developed a strong foundation in virology, molecular biology, and diagnostic microbiology.\n\nShe now works as an SEO Copywriter at Resolution Digital, where she combines her scientific training with research-driven content strategy. She is certified in Google Analytics and Google Business Profile (GBP), and brings a data-informed approach to science communication writing content that is not only accurate but structured to reach and serve the students who need it most.\n\nAt microbeonline, Ashma contributes articles primarily in virology and molecular biology, areas she finds most compelling for their mechanistic depth and their growing clinical relevance. Her writing reflects the same standard the site is built on: factual rigor, clear explanation of the *why* behind microbiology concepts, and content that helps students move from memorization to genuine understanding.\n\nShe is passionate about making complex microbiological concepts accessible without sacrificing accuracy; a skill that sits at the intersection of her scientific training and her professional work in content and SEO.",88,{"slug":322,"name":275,"description":323,"image":324,"body":325,"postCount":326},"sushmita-baniya","Author \u002F Contributor","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fsushmita-baniya-1.png","Sushmita Baniya holds an M.Sc. in Medical Microbiology from Tribhuvan University (National College), with a research focus in Genetics and Molecular Biology. She is actively involved in teaching and research in the field of microbiology.",26,{"slug":328,"name":188,"description":323,"image":329,"body":330,"postCount":331},"samikshya-acharya","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fsamikshya-acharya.jpeg","Samikshya Sharma completed her postgraduate studies in Medical Microbiology at the Central Department of Microbiology, Tribhuvan University, Nepal. She contributes to Microbeonline with the goal of making foundational and clinical microbiology concepts clear and useful for students in medical, laboratory science, and allied health programs.",20,{"slug":333,"name":334,"description":323,"image":42,"body":335,"postCount":336},"alisha-tripathi","Alisha Tripathi","Alisha Tripathi holds an M.Sc. in Medical Microbiology from National College, Tribhuvan University. With over a year of teaching experience, her academic interests span Molecular Biology, Immunology, and Genetics.",6,{"slug":338,"name":339,"description":340,"image":42,"body":341,"postCount":342},"aastha-shrestha","Aastha Shrestha"," Author \u002F Contributor","Aastha Shrestha is a Biotechnology graduate with an M.Sc. from National College, Tribhuvan University. Her academic interests center on Molecular Biology and Immunology; two fields that are increasingly converging in modern diagnostic and clinical microbiology. \n\nShe contributes to Microbeonline with the goal of making complex concepts in these areas approachable and exam-relevant for students across medical, biotechnology, and laboratory science programs.",9,{"slug":344,"name":345,"description":346,"image":42,"body":42,"postCount":347},"guest-author","Guest Author","Guest Author \u002F Contributor",1,{"slug":349,"name":350,"description":323,"image":351,"body":352,"postCount":353},"srijana-khanal","Srijana Khanal","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fsrijana-khanal-1.png","Srijana Khanal is a microbiology educator with nearly a decade of teaching experience, including her role as faculty in the Microbiology Department at National College, NIST. \n\nHer time in the classroom has given her a clear sense of where students struggle and what explanations actually work, a perspective that directly shapes how she writes.\n\nHer academic interests span Immunology, Genetics, Basic Sciences, and Research Methodology, and she brings the same rigor to her writing that she brought to teaching. Alongside academic writing, she has a passion for creative writing -- an instinct that shows in her ability to make dense scientific material readable without sacrificing accuracy.\n\nShe contributes to Microbeonline to extend her teaching reach beyond the classroom, helping medical and laboratory science students across the region build a stronger foundation in microbiology.",15,{"slug":355,"name":356,"description":346,"image":42,"body":42,"postCount":347},"dr-poonam-acharya","Dr. Poonam Acharya",{"slug":358,"name":359,"description":360,"image":361,"body":362,"postCount":363},"nisha-rijal","Nisha Rijal","Microbiologist and AMR Specialist Kathmandu, Nepal","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fnisha-rijal-1.png","Nisha Rijal is a microbiologist with nearly 15 years of frontline diagnostic and surveillance experience at the National Public Health Laboratory (NPHL), national reference laboratory under the Department of Health Services, Nepal. She currently works as an AMR Support Officer at the World Health Organization (WHO), Nepal, where her work focuses on strengthening antimicrobial resistance surveillance systems and translating AMR data into actionable public health response.\n\nHer research, published in peer-reviewed journals and cited over 220 times, spans some of the most clinically significant infectious disease challenges in Nepal and South Asia: antimicrobial resistance trends in *Vibrio cholerae* across an 11-year national surveillance dataset, sero-epidemiology of scrub typhus in patients with acute febrile illness, lower respiratory tract infections in HIV-positive patients, and gonococcal resistance surveillance. She was a contributor to Nepal's National Antimicrobial Resistance Containment Action Plan, a foundational policy document for AMR governance in Nepal. You can find list of [Nisha Rijal's article here in Google Scholar.](https:\u002F\u002Fscholar.google.com\u002Fcitations?user=N-Ruq54AAAAJ&hl=en)\n\nThis depth of experience is visible in her writing at Microbeonline. Her 53 published articles cover bacteriology, parasitology, mycology, immunology, and laboratory techniques, and are consistently among the most detailed and clinically grounded content on the site. She brings to every article the same standard that national reference laboratory work demands: methodological precision, awareness of real diagnostic constraints, and an understanding of what results actually mean for patient care in resource-limited settings.\n\nHer areas of particular expertise include antimicrobial susceptibility testing and resistance mechanism detection, quality assurance in clinical microbiology, and laboratory-based infectious disease surveillance.\n\n---\n\n*Nisha Rijal contributes to Microbeonline in a personal capacity. Her views and writing do not represent the positions of the World Health Organization or any other institution.*",55,{"slug":365,"name":366,"description":367,"image":368,"body":369,"postCount":347},"padma-shrestha","Padma Shrestha","Author","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fpadma-shrestha.png","Padma Shrestha is from Kathmandu, Nepal. She has completed Masters degree in Medical microbiology from Tribhuvan University. She has great interest in Microbiology and Molecular Biology.",[371,377,382,386,391,396,399,403,407,412,417,422,426,431,435,440,444,448,453,457,461,465,469,473,477,481,484,488,493,498,503,507,511,516,520,524,528,532,536,540,544,548,552,555,559,564,568,572,577,581,585,589,593,597,601,606,610,614,618,622,626,630,634,638,642,646,650,654,657,661,664,667,670,673,676,679,682,685,688,691,694,697,700,703,706,709,713,716],{"slug":372,"name":373,"description":374,"image":375,"body":376,"postCount":353},"gram-negative-cocci","Gram-Negative Cocci and Coccobacilli","Neisseria, Moraxella, Haemophilus and related gram-negative coccal organisms","https:\u002F\u002Fassets.microbeonline.com\u002Ftags\u002Fgram-negative-cocci.png","# Gram Negative Cocci\n\nNeisseria gonorrhoeae, Neisseria meningitides, Moraxella catarrhalis, and other Neisseria spp. are clinically relevant gram-negative cocci.\n\nN. gonorrhoeae is the leading cause of sexually transmitted disease whereas N. meningitides is a leading cause of fatal bacterial meningitis.",{"slug":240,"name":378,"description":379,"image":42,"body":380,"postCount":381},"Microscopy","Microscope types, components, and microscopy techniques","These are list of blog posts related to microscopy. ",12,{"slug":383,"name":384,"description":385,"image":42,"body":42,"postCount":381},"gram-positive-cocci","Gram-Positive Cocci","Staphylococcus, Streptococcus, Enterococcus, Micrococcus — organisms, diseases, and identification tests",{"slug":387,"name":388,"description":389,"image":42,"body":42,"postCount":390},"gram-negative-rods","Gram-Negative Rods (Other than Enterobacteriaceae)","\u003Cp>Gram negative rods other than members of Enterobacteriaceae family such as  Pseudomonas, Acinetobacter and related organisms\u003C\u002Fp>",5,{"slug":392,"name":393,"description":394,"image":42,"body":42,"postCount":395},"gram-positive-rods","Gram-Positive Rods","Bacillus, Clostridium, Listeria, Corynebacterium, Actinomyces and related organisms",8,{"slug":137,"name":397,"description":398,"image":42,"body":42,"postCount":381},"Mycobacteria","Mycobacterium tuberculosis, leprosy, atypical mycobacteria, and acid-fast organism diagnosis",{"slug":400,"name":401,"description":402,"image":42,"body":42,"postCount":381},"anaerobic-bacteriology","Anaerobic Bacteriology","Anaerobic organisms, anaerobic culture methods, and anaerobic infection diagnosis",{"slug":404,"name":405,"description":406,"image":42,"body":42,"postCount":381},"enterobacteriaceae","Enterobacteriaceae","Identification, differentiation, and clinical significance of Enterobacteriaceae family members",{"slug":408,"name":409,"description":410,"image":42,"body":42,"postCount":411},"spirochetes","Spirochetes","Treponema, Leptospira, Borrelia and spirochetal infections",7,{"slug":413,"name":414,"description":415,"image":42,"body":42,"postCount":416},"food-microbiology","Food Microbiology","Food-borne pathogens, food safety, spoilage, and preservation",14,{"slug":418,"name":419,"description":420,"image":42,"body":42,"postCount":421},"antimicrobial-susceptibility-testing","Antimicrobial Susceptibility Testing","Methods for testing antibiotic susceptibility in clinical microbiology",22,{"slug":423,"name":424,"description":425,"image":42,"body":42,"postCount":416},"antimicrobials-moa-amr","Antimicrobials (MOA & AMR)","Mechanisms, detection, and clinical significance of antimicrobial resistance",{"slug":427,"name":428,"description":429,"image":42,"body":42,"postCount":430},"sterilization-disinfection","Sterilization and Disinfection","Methods of sterilization and disinfection in healthcare and laboratory settings",10,{"slug":432,"name":433,"description":434,"image":42,"body":42,"postCount":326},"specimen-collection-transport","Specimen Collection and Transport","Collection, handling, and transport of clinical specimens for microbiological testing",{"slug":436,"name":437,"description":438,"image":42,"body":42,"postCount":439},"bacterial-structure-physiology","Bacterial Structure and Physiology","Bacterial cell structure, growth, physiology, and environmental factors affecting growth",21,{"slug":441,"name":442,"description":42,"image":42,"body":443,"postCount":336},"horizontal-gene-transfer","Horizontal Gene Transfer","Articles related to **Horizontal Gene Transfer**",{"slug":445,"name":446,"description":42,"image":42,"body":447,"postCount":430},"chromatography","Chromatography","Information about chromatographic techniques.",{"slug":449,"name":450,"description":451,"image":42,"body":452,"postCount":411},"electrophoresis","Electrophoresis","Information about Electrophoresis Techniques ","Detailed information  about Electrophoresis Techniques ",{"slug":103,"name":454,"description":455,"image":42,"body":456,"postCount":336},"PCR Techniques","Information about various types of Polymerase Chain Reaction Techniques ","More detailed information about various types of Polymerase Chain Reaction Techniques ",{"slug":458,"name":459,"description":460,"image":42,"body":42,"postCount":336},"bacteriophage","Bacteriophage","Description about Bacteriophage.",{"slug":462,"name":463,"description":464,"image":42,"body":42,"postCount":336},"malaria","Malaria","It is the collections of articles regarding malarial disease. ",{"slug":466,"name":467,"description":468,"image":42,"body":42,"postCount":336},"anaerobic-culture-techniques","Anaerobic Culture Techniques","Posts related with Anaerobic Culture Techniques.",{"slug":470,"name":471,"description":472,"image":42,"body":42,"postCount":439},"immunoassays","Immunoassays","You will get information about all the diagnostic tests that rely on the specific binding between an antigen and an antibody to detect or quantify a substance.",{"slug":474,"name":475,"description":476,"image":42,"body":42,"postCount":411},"biosafety-levels","Biosafety levels ","Articles related to Biosafety Levels",{"slug":478,"name":479,"description":480,"image":42,"body":42,"postCount":390},"environmental-factors","Environmental Factors ","In this case we are talking about growth requirements of microorganisms with deep dive in environmental factors that affect the growth. ",{"slug":270,"name":482,"description":483,"image":42,"body":42,"postCount":336},"Pipette","Posts related with Pipette. ",{"slug":485,"name":486,"description":487,"image":42,"body":42,"postCount":411},"bacteriology-mcqs","Bacteriology MCQs","This sections lists MCQs in Bacteriology.",{"slug":489,"name":490,"description":491,"image":42,"body":42,"postCount":492},"parasitology-mcqs","Parasitology MCQs","This section lists MCQs in Parasitology.",2,{"slug":494,"name":495,"description":496,"image":42,"body":42,"postCount":497},"virology-mcqs","Virology MCQs","This is the collections of Multiple Choice Questions in Virology.",4,{"slug":499,"name":500,"description":501,"image":42,"body":42,"postCount":502},"mcqs-in-microbiology","MCQs in Microbiology","This section lists the collections of Multiple Choice Questions in General Microbiology Topics. ",3,{"slug":504,"name":505,"description":506,"image":42,"body":42,"postCount":411},"immunology-mcqs","Immunology MCQs","In this section; we are posting collections of Multiple Choice Questions about Immunology. ",{"slug":508,"name":509,"description":510,"image":42,"body":42,"postCount":430},"microbial-curiosities","Microbial Curiosities","In this clusters, we are posting interesting and unique information about Microorganisms. ",{"slug":512,"name":513,"description":514,"image":42,"body":42,"postCount":515},"bacterial-culture-media","Bacterial Culture Media","Posts related to Bacterial Culture Media. ",23,{"slug":517,"name":518,"description":519,"image":42,"body":42,"postCount":336},"fungal-culture-media","Fungal Culture Media","Posts related to Fungal Culture Media.",{"slug":521,"name":522,"description":523,"image":42,"body":42,"postCount":390},"motility-test","Motility Test","This lists the procedure regarding various tests methods for bacterial motility.",{"slug":525,"name":526,"description":527,"image":42,"body":42,"postCount":430},"bacterial-enumeration","Bacterial enumeration","These posts are related to isolation and enumeration of bacteria. ",{"slug":529,"name":530,"description":531,"image":42,"body":42,"postCount":492},"gram-positive-coccobacillus","Gram-positive coccobacillus","List of Gram Positive Coccobacilli",{"slug":533,"name":534,"description":535,"image":42,"body":42,"postCount":336},"dimorphic-fungi","Dimorphic Fungi","This is about various dimorphic fungi. ",{"slug":537,"name":538,"description":539,"image":42,"body":42,"postCount":411},"bacterial-classification","Bacterial Classification","These posts are related with various approaches used for the classification of Bacteria. ",{"slug":541,"name":542,"description":543,"image":42,"body":42,"postCount":390},"immunofluorescence","Immunofluorescence ","Various Tests related to Immunofluorescence ",{"slug":545,"name":546,"description":547,"image":42,"body":42,"postCount":342},"antibody-mediated-immunity","Antibody-mediated Immunity","This clusters links the articles that are sharing insights about Antibody-mediated immunity. ",{"slug":549,"name":550,"description":551,"image":42,"body":42,"postCount":411},"hypersensitivity","Hypersensitivity","Articles related to Hypersensitivity.",{"slug":553,"name":554,"description":42,"image":42,"body":42,"postCount":502},"haemophilus","Haemophilus",{"slug":556,"name":557,"description":558,"image":42,"body":42,"postCount":336},"sexually-transmitted-infections-stis","Sexually transmitted infections (STIs)","This is the clusters of infections that are transmitted sexually. ",{"slug":560,"name":561,"description":562,"image":42,"body":42,"postCount":563},"adaptive-immunity","Adaptive Immunity","Blog posts related to B Cell Immunity and T Cell Immunity.",13,{"slug":565,"name":566,"description":567,"image":42,"body":42,"postCount":416},"fungal-diagnostics","Fungal Diagnostics","Various methods used for the Diagnosis of Fungal Infections. ",{"slug":569,"name":570,"description":571,"image":42,"body":42,"postCount":390},"laboratory-storage-and-preservation","Laboratory Storage and Preservation","Articles about Laboratory Storage of Antimicrobial Disk, Test organisms and Equipment used for this process. ",{"slug":573,"name":574,"description":575,"image":42,"body":576,"postCount":336},"laboratory-heating-equipment","Laboratory Heating Equipment","A guide to laboratory heating equipment, including hot plates, water baths, Bunsen burners, incubators, and dry baths, and how to choose the right one for each task.","Laboratory heating equipment covers the instruments that warm, melt, incubate, or sterilize samples and media in a microbiology laboratory. Each one delivers heat differently. \n\nA hot plate gives high, direct, dry heat; a water bath gives gentle, even, wet heat up to about 100°C; a Bunsen burner gives an open flame for rapid, very high heat; an incubator holds cultures at a steady temperature over hours or days; and a dry bath heats small tubes without water. Choosing the right one depends on the temperature you need, how precise it must be, and whether the sample can tolerate direct or open-flame heat.\n\nThe articles below cover each piece of heating equipment in detail, including its parts, working principle, uses, and the mistakes that most often go wrong at the bench.",{"slug":578,"name":579,"description":580,"image":42,"body":42,"postCount":342},"laboratory-glassware","Laboratory Glassware","Posts about Laboratory Glassware. ",{"slug":582,"name":583,"description":584,"image":42,"body":42,"postCount":342},"helminths","Helminths","In this section, we are covering properties, life cycle, pathogenesis and laboratory diagnosis of Helminths\u002FHelminthic infestations. ",{"slug":586,"name":587,"description":588,"image":42,"body":42,"postCount":336},"protozoan-parasite","Protozoan Parasite","In this cluster, we are covering protozoan parasites. ",{"slug":590,"name":591,"description":592,"image":42,"body":42,"postCount":347},"tests-for-gram-positive-cocci","Biochemical Tests for Gram Positive Cocci","This is the lists of Biochemical Tests that are used for Gram Positive Cocci. ",{"slug":594,"name":595,"description":596,"image":42,"body":42,"postCount":430},"bacterial-staining-technique","Bacterial Staining Technique","Lists of various staining techniques that are used to stain bacteria. ",{"slug":598,"name":599,"description":600,"image":42,"body":42,"postCount":439},"enzyme-tests","Enzyme Tests","\u003Cp>Various Biochemical Test that are based on enzymatic activity of the microorganisms. \u003C\u002Fp>",{"slug":602,"name":603,"description":604,"image":42,"body":42,"postCount":605},"carbohydrate-utilization","Carbohydrate Utilization","\u003Cp>Various biochemical tests which are related to Carbohydrate fermentation or Utilization\u003C\u002Fp>",11,{"slug":607,"name":608,"description":609,"image":42,"body":42,"postCount":390},"susceptibility-based-id","Susceptibility-based ID","\u003Cp>These are susceptibility based identification test such as optochin sensitivity, bacitracin sensitivity etc. \u003C\u002Fp>",{"slug":611,"name":612,"description":613,"image":42,"body":42,"postCount":497},"microbial-metabolism","Microbial Metabolism","\u003Cp>Tests about Microbial Metabolism. \u003C\u002Fp>",{"slug":615,"name":616,"description":617,"image":42,"body":42,"postCount":395},"substrate-utilization","Substrate Utilization","\u003Cp>The test in which a non-sugar carbon\u002Fnitrogen source is used or degraded (citrate, malonate, decarboxylases, indole, PAD).\u003C\u002Fp>",{"slug":619,"name":620,"description":621,"image":42,"body":42,"postCount":502},"atypical-pneumonia","Atypical Pneumonia","\u003Cp>Organisms responsible for Atypical Pneumonia. \u003C\u002Fp>",{"slug":623,"name":624,"description":625,"image":42,"body":42,"postCount":390},"antigen","Antigen","\u003Cp>Various articles related to Antigens.\u003C\u002Fp>",{"slug":627,"name":628,"description":629,"image":42,"body":42,"postCount":411},"innate-immunity","Innate Immunity","\u003Cp>Articles related to Innate Immunity. \u003C\u002Fp>",{"slug":631,"name":632,"description":633,"image":42,"body":42,"postCount":497},"respiratory-tract-infection","Respiratory Tract Infection","\u003Cp>In this cluster, you can see various etiological agents that causes respiratory tract infection. \u003C\u002Fp>",{"slug":635,"name":636,"description":637,"image":42,"body":42,"postCount":390},"torch-infection","TORCH Infection","\u003Cp>In this section; you can find articles related with TOCH infection. \u003C\u002Fp>",{"slug":639,"name":640,"description":641,"image":42,"body":42,"postCount":395},"microbiology-for-beginners","Microbiology for Beginners","\u003Cp>These articles are very basic articles, which will share general concepts in Microbiology. \u003C\u002Fp>",{"slug":643,"name":644,"description":645,"image":42,"body":42,"postCount":336},"dna-replication","DNA Replication","\u003Cp>Articles related to DNA and Replication of DNA. \u003C\u002Fp>",{"slug":647,"name":648,"description":649,"image":42,"body":42,"postCount":336},"genetic-code","Genetic Code","\u003Cp>Articles related to Genetic Code.\u003C\u002Fp>",{"slug":651,"name":652,"description":653,"image":42,"body":42,"postCount":411},"molecular-technique","Molecular Technique","\u003Cp>Posts related to Molecular Techniques. \u003C\u002Fp>",{"slug":655,"name":656,"description":42,"image":42,"body":42,"postCount":347},"colorimetric-assay","Colorimetric Assay ",{"slug":658,"name":659,"description":660,"image":42,"body":42,"postCount":390},"pharmaceutical-microbiology","Pharmaceutical Microbiology","\u003Cp>Various articles related to Pharmaceutical Microbiology\u003C\u002Fp>",{"slug":662,"name":663,"description":42,"image":42,"body":42,"postCount":502},"blood-and-immune-cells","Blood and Immune Cells",{"slug":665,"name":666,"description":42,"image":42,"body":42,"postCount":390},"host-pathogen-interaction","Host Pathogen Interaction",{"slug":668,"name":669,"description":42,"image":42,"body":42,"postCount":497},"blood-culture","Blood Culture",{"slug":671,"name":672,"description":42,"image":42,"body":42,"postCount":497},"environmental-microbiology","Environmental microbiology ",{"slug":674,"name":675,"description":42,"image":42,"body":42,"postCount":411},"copromicroscopic-technique","Copromicroscopic Technique",{"slug":677,"name":678,"description":42,"image":42,"body":42,"postCount":502},"quality-control","Quality Control",{"slug":680,"name":681,"description":42,"image":42,"body":42,"postCount":411},"dermatophytes","Dermatophytes",{"slug":683,"name":684,"description":42,"image":42,"body":42,"postCount":502},"viral-hemorrhagic-fevers","Viral Hemorrhagic Fevers",{"slug":686,"name":687,"description":42,"image":42,"body":42,"postCount":497},"h2s-production","H2S Production",{"slug":689,"name":690,"description":42,"image":42,"body":42,"postCount":492},"water-quality-testing","Water Quality Testing",{"slug":692,"name":693,"description":42,"image":42,"body":42,"postCount":390},"virology-basics","Virology basics",{"slug":695,"name":696,"description":42,"image":42,"body":42,"postCount":497},"typing-methods","Typing Methods",{"slug":698,"name":699,"description":42,"image":42,"body":42,"postCount":502},"blotting-technique","Blotting Technique",{"slug":701,"name":702,"description":42,"image":42,"body":42,"postCount":497},"history-microbiology","History of Microbiology",{"slug":704,"name":705,"description":42,"image":42,"body":42,"postCount":336},"trematodes","Trematodes",{"slug":707,"name":708,"description":42,"image":42,"body":42,"postCount":497},"coccidian-parasites","Coccidian Parasites",{"slug":710,"name":711,"description":712,"image":42,"body":42,"postCount":416},"cell-structure","Cell Structure","\u003Cp>Articles related to Cell Structure. \u003C\u002Fp>",{"slug":714,"name":715,"description":42,"image":42,"body":42,"postCount":307},"automation-in-microbiology","Automation in Microbiology",{"slug":717,"name":718,"description":42,"image":42,"body":42,"postCount":336},"laboratory-management","Laboratory Management"]