[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fxLN3MUwXCdr5RPjwZYIDpOj8CHyjOmngWTgoKXPtZbg":3,"$fq4rE05VVuMqVB7F0_5fDMMTKuV17DEKeKsGmCIkdouQ":36,"$f3Ft0rKFJHppdzE-vuveecxx1BUcg9iOlMLtyzf_MJDg":210,"$fucxFBm2ZjZfGSdmdRaSNGBI_F0jJme4f0GTvzUhQfL8":273},[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":45,"draft":46,"category":47,"image":42,"body":48,"faq":49,"commentsClosed":46,"tags":50,"related":52,"comments":206},"sabouraud-dextrose-agar-sda-principle-composition-uses-colony-morphology","Sabouraud Dextrose Agar (SDA): Composition, Principle, Uses, and Colony Morphology","Sabouraud Dextrose Agar (SDA) is the standard medium for fungal isolation. Learn its composition, how its acidic pH selects for fungi, colony morphology of dermatophytes and yeasts, cycloheximide modification, and clinical uses.",null,"Nisha Rijal","2015-07-05","2026-08-03",false,"culture-media","A 35-year-old man presents with a slowly spreading, scaly, ring-shaped lesion on his inner thigh. His clinician suspects tinea cruris, a dermatophyte infection. Skin scrapings are sent to the microbiology laboratory. The technician inoculates two media: a [KOH preparation for direct microscopy](https:\u002F\u002Fmicrobeonline.com\u002Fkoh-preparation-test-principle-procedure-results-uses\u002F) and a Sabouraud Dextrose Agar plate for culture. The KOH prep gives a result within minutes; the SDA plate will take 1 to 4 weeks, but it will provide the species-level identification needed to guide treatment and confirm whether the infection is from *Trichophyton rubrum* (the most common cause worldwide) or another dermatophyte.\n\nThat slow-growing, acid-tolerant, dextrose-rich environment is what Sabouraud Dextrose Agar was specifically designed to provide.\n\nSabouraud Agar or Sabouraud Dextrose Agar (SDA) is **a selective medium** primarily used for the isolation of dermatophytes. Other fungi, yeasts, and filamentous bacteria such as  *Nocardia* can also grow in SDA. The acidic pH of this medium (pH about 5.6) inhibits the growth of bacteria but permits the growth of yeasts and most filamentous fungi. Antibacterial agents can also be added to augment the antibacterial effect.\n\n![Various fungal colonies in SDA agar - Fungal colonies (front-side) on Sabourad Dextrose Agar](\u002Fblogs\u002FFungal-Colonies-in-SDA.jpg)Figure: Fungal colonies (front-side) on Sabourad Dextrose Agar\n\nThis medium is also helpful to determine the mycological evaluation of food, contamination in cosmetics, and clinically to aid in the diagnosis of yeast and fungal infections.\n\nAddition of antibiotics like chloramphenicol, gentamicin, and tetracycline as selective agents can inhibit the overgrowth of competing bacteria while permitting the successful isolation of fungi and yeasts. Various other modifications are also reported by using cycloheximide, penicillin, streptomycin, neomycin depending upon the intended use.\n\n## Principle\n\nSabouraud Dextrose Agar comprises of **enzymatic digest of casein** and animal tissues which provide a nutritious source of amino acids and nitrogenous compounds for the growth of fungi and yeasts.\n\n**Dextrose** is a fermentable carbohydrate incorporated in high concentrations as a carbon and energy source. **Agar** is the solidifying agent. The addition of **antibiotics** like chloramphenicol and\u002For tetracycline acts as broad-spectrum antimicrobials to inhibit the growth of a wide range of gram-positive and gram-negative bacteria. Gentamicin is added to further inhibit the growth of gram-negative bacteria.\n\n**Why acidic pH selects for fungi:**\n\nMost clinically significant bacteria grow optimally at pH 7.2–7.4 and are significantly inhibited or killed at pH 5.0–5.6. Fungi, by contrast, have a much wider pH tolerance and grow well across a range of pH 2.0–9.0, with optimal growth around pH 5.0–6.0 for most species. Sabouraud Dextrose Agar exploits this difference: its acidic pH (approximately 5.6) creates an environment that favors fungal growth while suppressing most bacteria, particularly the rapidly growing Gram-negative organisms that would otherwise overgrow slow-growing fungal colonies in clinical specimens.\n\nThe high dextrose concentration (40 g\u002FL: four times that of standard bacteriological media) provides an abundant carbon and energy source that particularly favors fungi adapted to carbohydrate-rich environments, including dermatophytes infecting keratinized skin, hair, and nails.\n\n**Important limitation:** The acidic pH and absence of blood or serum means SDA is not reliable for primary isolation of dimorphic fungi (*Histoplasma capsulatum, Blastomyces dermatitidis, Coccidioides immitis*) from clinical specimens. At 37°C these fungi convert to their yeast phase, which requires the richer conditions that SDA lacks. Brain Heart Infusion (BHI) agar is preferred for primary isolation of dimorphic fungi suspected from clinical specimens.\n\n## Composition of SDA\n\n| Ingredients | G\u002FL |\n| --- | --- |\n| Mycological peptone (enzymatic digest of casein and animal tissues) | 10  |\n| Dextrose | 40  |\n| Agar | 15  |\n\nFinal pH: 5.6 ± 0.2 at 25°C\n\n## Preparation of SDA\n\n1. Suspend 65 gm of the medium in one liter of purified water.\n2. Heat with frequent agitation and boil for one minute to completely dissolve the medium.\n3. [Autoclave at 121°C for 15 minutes.](\u002Fautoclave-principle-procedure-types-and-uses\u002F)\n4. Cool to 45 to 50°C and pour into Petri dishes or tubes for slants.\n5. To process specimens, streak the specimen onto the medium with a sterile [inoculating loop](\u002Finoculating-loop-types-and-uses\u002F) to obtain isolated colonies.\n6. Incubate the plates at 25 – 30°C in an inverted position (agar side up) with increased humidity.\n7. Cultures should be examined weekly for fungal growth and held for 4 – 6 weeks before being reported as negative.\n\n![Mold colony with Black pigmentation in SDA - Mold colony with black pigmentation in SDA](\u002Fblogs\u002FSDA-plate.jpg)Figure: Mold colony with black pigmentation in SDA\n\n### Result and interpretation\n\nAfter sufficient incubation, SDA plates should show isolated colonies in streaked areas and confluent growth in areas of heavy inoculation. Examine plates for fungal colonies exhibiting typical color and morphology. Additional procedures should be performed to confirm the findings.\n\nYeasts will grow as creamy to white colonies. Molds will grow as filamentous colonies of various colors.\n\n## Colony Morphology on SDA\n\nFungal colonies on SDA are examined for two sides: the **obverse (front)**; the top surface showing colony color, texture, and surface morphology and the **reverse (underside),** which often shows pigmentation that is diagnostically important, particularly for dermatophytes.\n\nIncubation temperature matters: dermatophytes are incubated at 25–28°C; *Candida* and other yeasts grow well at both 25°C and 37°C; dimorphic fungi grow in their mold phase at 25°C on SDA.\n\n| Organism | Obverse color\u002Ftexture | Reverse color | Incubation | Clinical significance |\n| --- | --- | --- | --- | --- |\n| *Candida albicans* | Cream to white, smooth, pasty, yeast-like odor | Cream | 25–37°C, 24–48 hrs | Most common fungal pathogen; oral, vaginal, invasive candidiasis |\n| *Trichophyton rubrum* | White to buff, flat or granular, powdery surface | **Deep wine-red to cherry-red** | 25–28°C, 1–3 weeks | Most common cause of tinea pedis, onychomycosis, tinea cruris |\n| *Trichophyton mentagrophytes* | White to cream, flat or granular, may be powdery | Yellow-brown to tan | 25–28°C, 1–2 weeks | Tinea pedis, tinea unguium; zoophilic strains cause inflammatory ringworm |\n| *Microsporum canis* | White to pale yellow, flat, fluffy | **Bright lemon-yellow to golden-yellow** | 25–28°C, 1–2 weeks | Tinea capitis and tinea corporis; most common dermatophyte from animals |\n| *Microsporum gypseum* | Cinnamon-brown, granular, powdery | Pale yellow to tan | 25–28°C, 1–2 weeks | Geophilic; soil exposure; granular texture due to abundant macroconidia |\n| *Aspergillus fumigatus* | Blue-green, powdery | Pale yellow | 37°C (grows well), 2–5 days | Invasive aspergillosis in immunocompromised patients |\n| *Aspergillus flavus* | Yellow-green, powdery | Pale yellowish | 25–37°C, 3–5 days | Aflatoxin production; opportunistic infection |\n| *Aspergillus niger* | Initially white, then **black (\"salt and pepper\")** | Pale yellow | 25–37°C, 3–5 days | Otomycosis; rarely invasive |\n| *Aspergillus nidulans* | Greenish-blue with whitish edge | Yellow to brownish | 25–37°C | Less common Aspergillus species |\n| *Rhodotorula* spp. | Pinkish-orange, creamy, salmon-colored | Pink-orange | 25–37°C, 2–4 days | Emerging opportunist in immunocompromised patients; catheter-associated |\n| *Trichosporon mucoides* | White to cream, yellowish, wrinkled | White to cream | 25–37°C | Superficial and invasive infections in immunocompromised |\n| *Geotrichum candidum* | White to cream, flat with aerial mycelium | White | 25°C | Geotrichosis; dairy-associated contaminant |\n\n> **Reverse pigmentation is the key to dermatophyte identification.** The deep wine-red to cherry-red reverse of *T. rubrum* is one of the most reliable macroscopic identifiers in clinical mycology. When examining a slow-growing, white, powdery colony on SDA, always flip the plate and examine the underside before proceeding to microscopy.\n\n## Modifications of Sabouraud Agar\n\n### Cycloheximide Modification\n\nCycloheximide (actidione) is added to SDA at 0.4–0.5 g\u002FL to inhibit the growth of saprophytic (environmental) fungi that would otherwise overgrow slow-growing pathogenic dermatophytes in clinical specimens. This modification is particularly useful for skin, hair, and nail cultures where environmental molds are expected as contaminants.\n\n**Critical limitation of cycloheximide-containing SDA:**\n\nCycloheximide is not selective only for saprophytes. It also inhibits several clinically important fungi:\n\n| Fungi inhibited by cycloheximide | Clinical significance |\n| --- | --- |\n| *Candida* spp. (most) | Common cause of mucosal and invasive infections |\n| *Cryptococcus neoformans* | Serious opportunistic meningitis in HIV patients |\n| *Aspergillus* spp. | Leading cause of invasive mold infections |\n| *Trichosporon* spp. | Systemic infections in immunocompromised |\n| *Pseudallescheria boydii (Scedosporium apiospermum)* | Mycetoma; keratitis |\n\n**Practical rule:** When a specimen may contain *Candida*, *Cryptococcus*, or *Aspergillus* (e.g., BAL, blood, CSF), SDA **without** cycloheximide must be used alongside or instead of cycloheximide-containing SDA. Many laboratories therefore routinely inoculate two SDA plates: one with cycloheximide (for dermatophytes), one without (for all other fungi).\n\n**Exam mnemonic**\n\n**\"Cycloheximide CCAT\":** Cycloheximide inhibits ***C****andida, **C**ryptococcus, **A**spergillus, and **T**richosporon*. These are the four genera you must specifically consider when choosing whether to use the cycloheximide modification.\n\n### SabHI Agar (Sabouraud-Brain Heart Infusion Agar)\n\nSabHI agar is formulated by combining equal parts Sabouraud Dextrose Agar and Brain Heart Infusion (BHI) agar. This hybrid medium retains some of SDA's selectivity against bacteria while gaining BHI's richness and ability to support fastidious organisms.\n\n**Why it was developed:** Standard SDA does not reliably recover dimorphic fungi (*Histoplasma*, *Blastomyces*, *Coccidioides*, *Sporothrix*) from primary clinical specimens because these organisms require richer nutrient conditions for primary isolation, particularly at 37°C in their yeast phase. BHI alone supports them but also permits bacterial overgrowth. SabHI balances both requirements.\n\n**Key property:** SabHI does not promote conidiation of filamentous fungi as effectively as SDA. This means that while recovery rates are higher on SabHI, characteristic sporulation patterns used for identification may be less pronounced, subcultural onto plain SDA is often required for definitive identification.\n\n## How to Remember\n\n**SDA is defined by three features, and each one is clinically meaningful:**\n\n1. **Low pH (\\~5.6)** = selects for fungi over bacteria. Think: \"fungi like acid, bacteria do not.\"\n2. **High dextrose (40 g\u002FL)** = energy-rich environment that fuels slow-growing fungi. Four times the glucose of standard media.\n3. **Incubation at 25–28°C for dermatophytes** = room temperature, not body temperature. Dermatophytes grow in keratinized skin at the body surface (cooler than core temperature). Their lab growth temperature mirrors their natural niche.\n\n**The reverse side rule:** Always examine the reverse of a dermatophyte colony on SDA. The pigment on the underside is often more diagnostic than the surface.\n\n- Wine-red reverse = *T. rubrum* (most common worldwide)\n- Lemon-yellow reverse = *Microsporum canis* (from cats and dogs)\n- Tan\u002Fbrown reverse = *T. mentagrophytes*\n\n**Cycloheximide = a trade-off:**\n\n- With cycloheximide: good for dermatophytes, bad for *Candida*, *Cryptococcus*, *Aspergillus*\n- Without cycloheximide: grows everything including saprophytic molds that contaminate\n- When in doubt: use both plates\n\n**How SDA fits in the mycology media battery:**\n\n| Specimen | First choice | Why |\n| --- | --- | --- |\n| Skin scraping, nail, hair | SDA + cycloheximide | Select for dermatophytes, inhibit saprophytes |\n| BAL, CSF, blood | SDA without cycloheximide + BHI | Cannot miss *Candida*, *Cryptococcus*, *Aspergillus* |\n| Vaginal swab | SDA without cycloheximide | *Candida* must grow |\n| Suspected dimorphic fungi | BHI agar (primary), SDA (subculture) | BHI better for primary recovery |\n\n## Limitations of Sabouraud Agar\n\n1. It does not promote the conidiation of filamentous fungi.\n2. Antimicrobial agents added into a medium to inhibit bacteria may also inhibit certain pathogenic fungi.\n3. Avoid overheating a medium with an acidic pH; this may result in a soft medium.\n\nPhoto credit: several fungal colony images courtesy of Yuri ([thunderhouse4-yuri.blogspot.com](http:\u002F\u002Fthunderhouse4-yuri.blogspot.com)), used with permission.\n\n**References and further readings**\n\n1. Acharya T., Hare J. (2022) Sabouraud Agar and Other Fungal Growth Media. In: Gupta V.K., Tuohy M. (eds) Laboratory Protocols in Fungal Biology. Fungal Biology. Springer, Cham. [https:\u002F\u002Fdoi.org\u002F10.1007\u002F978-3-030-83749-5_2](https:\u002F\u002Flink.springer.com\u002Fbook\u002F10.1007\u002F978-3-030-83749-5)\n2. Larone, D. H. (2018). *Medically Important Fungi: A Guide to Identification* (6th ed.). ASM Press.\n3. Tille, P. M. (2022). *Bailey and Scott's Diagnostic Microbiology* (15th ed.). Elsevier.\n4. Procop, G. W., et al. (2017). *Koneman's Color Atlas and Textbook of Diagnostic Microbiology* (7th ed.). Wolters Kluwer.",[],[51],"fungal-culture-media",[53,79,115,142,156,169,183],{"slug":54,"title":55,"description":56,"seoTitle":42,"seoDescription":42,"author":57,"createdDate":58,"lastUpdatedDate":59,"draft":46,"category":60,"image":42,"faq":61,"tags":77},"koh-preparation-test-principle-procedure-results-uses","KOH Mount: Principle, Procedure, Results, Uses","\u003Cp>KOH preparation: principle, procedure, 10% concentration rationale, organism-specific findings (dermatophytes, \u003Cem>Candida\u003C\u002Fem>, Mucorales, \u003Cem>Coccidioides\u003C\u002Fem>), troubleshooting artifacts vs true fungal elements, and comparison with calcofluor white.\u003C\u002Fp>","Acharya Tankeshwar","2016-04-30","2026-08-21","mycology",[62,65,68,71,74],{"question":63,"answer":64},"Is KOH a stain?","No. KOH is a clearing agent, not a stain. It dissolves keratin and other tissue material so that the fungus, which resists the alkali, becomes visible against a cleared background. It does not color or bind the fungus the way true stains such as PAS, GMS, or calcofluor white do.",{"question":66,"answer":67},"Why is 10% KOH used for skin but 20% for nails?","The concentration has to be strong enough to dissolve keratin in a reasonable time without distorting the fungal elements. Skin scrapings clear quickly in 10% KOH. Nails are far more heavily keratinized, so they need 20% (sometimes with gentle warming) to clear in a practical timeframe.",{"question":69,"answer":70},"What is the most common false-positive in KOH microscopy?","The outlines of normal skin cell borders, sometimes called \"mosaic fungus.\" These can mimic pseudohyphae. The distinguishing feature is that true hyphae cross over cell borders, whereas the artifact follows the cell boundaries exactly and does not cross into neighboring cells.",{"question":72,"answer":73},"How can I tell true hyphae from a cotton fiber?","True hyphae have a consistent width, show true branching, and usually show septa (cross-walls). Cotton and textile fibers are typically wider, do not branch, have sharp broken ends, and often shine brightly (birefringent) under polarized light. When in doubt, add calcofluor white, fibers do not fluoresce the way chitin-containing fungi do.",{"question":75,"answer":76},"Does a positive KOH mount identify the fungal species?","No. KOH confirms that fungal elements are present and can suggest a broad category (for example, septate hyphae versus broad aseptate hyphae versus yeast with pseudohyphae), but it does not identify the species. Culture is needed for definitive identification.",[78],"fungal-diagnostics",{"slug":80,"title":81,"description":82,"seoTitle":81,"seoDescription":83,"author":43,"createdDate":84,"lastUpdatedDate":85,"draft":46,"category":86,"image":42,"faq":87,"tags":112},"autoclave-principle-procedure-types-and-uses","Autoclave Sterilization: Cycles, Validation, Uses, and Failures","How steam sterilization actually works, the cycles and pressures for each load type, how to validate a run with biological and chemical indicators, what cannot be autoclaved, and the practical reasons cycles fail (trapped air, wet packs, and false-passing tape).","Understand autoclave steam sterilization cycles, loading, validation indicators, common uses, and the practical causes of wet packs and failed runs.","2019-10-03","2026-07-29","lab-equipment",[88,91,94,97,100,103,106,109],{"question":89,"answer":90},"What is the standard autoclave temperature, pressure, and time?","121°C at 15 psi for 15-20 minutes minimum. Holding time measured from when all materials in the load reach 121°C — not just the chamber gauge.",{"question":92,"answer":93},"Why is it temperature not pressure that sterilizes?","Pressure only raises boiling point to generate 121°C steam. High temperature denatures proteins and destroys nucleic acids. Steam at 100°C (atmospheric) cannot kill bacterial endospores.",{"question":95,"answer":96},"Why must all air be removed?","Air pockets prevent steam contact. Air-steam mixtures at 15 psi reach only ~112°C — too low. Complete air removal ensures 121°C throughout the entire load.",{"question":98,"answer":99},"What biological indicator tests autoclave effectiveness?","Geobacillus stearothermophilus spores — D-value 1.5-2.5 min at 121°C. CDC recommends weekly testing. For dry heat (hot air oven): Bacillus atrophaeus spores.",{"question":101,"answer":102},"Can you autoclave liquids in sealed containers?","Never — pressure differential when cycle ends can cause explosive rupture. Always loosen caps before autoclaving.",{"question":104,"answer":105},"Why are oils and powders not sterilized by autoclave?","Oils repel steam; powders trap air — both prevent steam penetration. Use dry heat sterilization (160-170°C) where conduction-based heat penetration is independent of steam.",{"question":107,"answer":108},"What is the difference between gravity displacement and pre-vacuum autoclave?","Gravity: steam slowly pushes air out — may leave air pockets. Pre-vacuum: pump actively removes air first ensuring complete steam penetration. Required for wrapped surgical packs.",{"question":110,"answer":111},"What cycle is recommended for prion-contaminated materials?","134°C for 18 minutes (pre-vacuum) OR NaOH\u002Fhypochlorite treatment + 134°C for 1 hour. Standard 121°C cycles do not inactivate prions. Single-use instruments preferred for CJD\u002FvCJD cases.",[113,114],"sterilization-disinfection","laboratory-heating-equipment",{"slug":116,"title":117,"description":118,"seoTitle":42,"seoDescription":42,"author":119,"createdDate":120,"lastUpdatedDate":121,"draft":46,"category":86,"image":42,"faq":122,"tags":141},"inoculating-loop-types-and-uses","Inoculating Loop: Types, Parts, Uses, and Sterilisation in Microbiology","\u003Cp>The inoculating loop is the primary instrument for transferring and streaking bacteria in microbiology. Learn its types (nichrome, platinum, disposable, calibrated), how to sterilize and cool it correctly, clinical uses including semi-quantitative urine culture, and common errors.\u003C\u002Fp>","Sushmita Baniya","2022-10-18","2026-08-14",[123,126,129,132,135,138],{"question":124,"answer":125},"What is the difference between an inoculating loop and an inoculating needle?","\u003Cp>An inoculating loop has a circular wire end and is used for surface transfers: streak plates, smear preparation, and broth inoculation. An inoculating needle has a straight wire end and is used for depth inoculation: stabbing semi-solid media such as SIM, TSI butt, gelatin, and motility media. The rule is: loop for surface, needle for depth.\u003C\u002Fp>",{"question":127,"answer":128},"Why must the inoculating loop be cooled before touching the specimen or agar?","\u003Cp>After flaming to red heat (above 800°C), the loop is hot enough to kill bacteria on contact and melt agar on touch. Cooling for 15–30 seconds allows the wire to reach a safe temperature. You can test the loop by briefly touching the agar edge away from any growth, if the agar crackles or the loop hisses, wait longer before proceeding.\u003C\u002Fp>",{"question":130,"answer":131},"Why are disposable plastic loops preferred for handling infectious specimens?","\u003Cp>Flaming a metal loop that carries infectious material generates aerosols, fine droplets containing viable organisms that become airborne. Disposable plastic loops are pre-sterilized and discarded after a single use, eliminating both the aerosol risk from flaming and the need for a Bunsen burner. They are the preferred choice in BSL-2 and BSL-3 work and in anaerobic chambers where open flames are prohibited.\u003C\u002Fp>",{"question":133,"answer":134},"What is a calibrated loop and what is it used for?","\u003Cp>A calibrated loop delivers a precise, defined volume of liquid  (either 1 µL or 10 µL) rather than an approximate loopful. In clinical microbiology, calibrated loops are used for semi-quantitative urine culture: the loop delivers a known volume of urine onto a CLED plate, colonies are counted after 24 hours of incubation, and the count is multiplied by the dilution factor to estimate CFU\u002FmL. Significant bacteriuria is defined as ≥10⁵ CFU\u002FmL. For full details on the urine culture procedure, see the Laboratory Diagnosis of UTI article.\u003C\u002Fp>",{"question":136,"answer":137},"What is the most common error when using an inoculating loop for a streak plate?","The most common error is re-entering a previous streak area without first re-sterilising the loop. This carries organisms back into an area already diluted, destroying the dilution gradient that produces isolated colonies. Each new quadrant must be entered only from the last few streaks of the previous area, and the loop must be flamed and cooled between quadrants.",{"question":139,"answer":140},"Why is nichrome wire preferred over platinum for routine laboratory loops?","\u003Cp>Nichrome wire (a nickel-chromium alloy) heats and cools rapidly, is resistant to corrosion, and costs significantly less than platinum, typically 10 to 20 times cheaper. It is durable enough for repeated flaming in routine bacteriology. Platinum wire is reserved for specialized applications where its superior acid resistance or longer working life under extreme conditions justifies the higher cost.\u003C\u002Fp>",[],{"slug":143,"title":144,"description":145,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":146,"lastUpdatedDate":147,"draft":46,"category":47,"image":42,"faq":148,"tags":155},"potato-dextrose-agar-pda-principle-composition-colony-characteristics","Potato Dextrose Agar (PDA): Composition, Preparation, Uses, and Fungal Colony Characteristics","Potato dextrose agar promotes sporulation in fungi that fail to produce conidia on richer media. Learn the composition, why potato infusion induces sporulation, typical colony characteristics of dermatophytes, and how PDA compares to Sabouraud agar.","2015-06-01","2026-07-13",[149,152],{"question":150,"answer":151},"Why does potato dextrose agar induce better sporulation than Sabouraud dextrose agar in some fungi?","PDA provides a nutritionally restricted environment — the potato infusion is low in amino acids and complex growth factors compared to the peptone-rich Sabouraud agar. This nutritional restriction creates metabolic stress that triggers fungi to reproduce by sporulation as a survival mechanism. On richer media like blood agar or BHI, the same fungi grow lush vegetative mycelium without sporulating. The 2% dextrose in PDA provides sufficient carbon for sustained growth, while the restricted nitrogen from potato infusion delivers the stress signal. This is why PDA is the preferred medium for inducing sporulation in dermatophytes that fail to produce diagnostic conidia on standard media.",{"question":153,"answer":154},"What is the diagnostic significance of red\u002Fwine-coloured reverse pigment on PDA?","A characteristic red to wine-red reverse pigment on the underside of colonies on PDA is highly characteristic of Trichophyton rubrum — the most common cause of tinea pedis (athlete's foot), tinea unguium (onychomycosis), and tinea corporis worldwide. This red reverse pigment is more prominently expressed on PDA than on Sabouraud agar, making PDA subculture valuable for confirming T. rubrum identity when reverse pigment is absent or faint on primary isolation plates. In combination with the microscopic appearance (thin-walled pencil-shaped macroconidia and tear-drop microconidia) and clinical presentation, the red reverse on PDA is an important identification feature.",[51],{"slug":157,"title":158,"description":159,"seoTitle":42,"seoDescription":42,"author":119,"createdDate":160,"lastUpdatedDate":147,"draft":46,"category":47,"image":42,"faq":161,"tags":168},"czapek-dox-agar-principle-composition-colony-characteristics","Czapek Dox Agar: Composition, Principle, and Colony Characteristics of Aspergillus and Penicillium","Czapek Dox agar is a synthetic medium with sucrose as the sole carbon source and nitrate as the sole nitrogen source — used for identification of Aspergillus, Penicillium, and other environmental fungi.","2022-06-11",[162,165],{"question":163,"answer":164},"What makes Czapek Dox agar different from Sabouraud dextrose agar for fungal identification?","Czapek Dox agar is a synthetic (chemically defined) medium with sucrose as the sole carbon source and sodium nitrate as the sole nitrogen source — providing minimal, standardised nutrition. Sabouraud dextrose agar contains peptone as a complex nitrogen source, supporting more luxuriant growth. On Czapek Dox, the nutritional restriction reveals phenotypic differences in colony texture, colour, and growth rate that are suppressed on richer media. This makes Czapek Dox particularly useful for taxonomic characterisation of Aspergillus and Penicillium species, where colony morphology on a defined medium is part of the formal species description. It is not used for primary isolation from clinical specimens as it does not support fastidious organisms.",{"question":166,"answer":167},"Which fungi are best identified on Czapek Dox agar?","Czapek Dox agar is primarily used for identification of Aspergillus and Penicillium species — both common environmental moulds that may cause opportunistic infections in immunocompromised patients. On Czapek Dox, Aspergillus fumigatus produces characteristic blue-grey to grey-green colonies, A. flavus produces yellow-green colonies with granular texture, and A. niger produces dense black colonies. Penicillium species produce characteristic blue-green powdery colonies with the brush-like conidiophore arrangement visible on LPCB mount. The standardised composition ensures reproducible colony morphology that matches published species descriptions used in formal identification.",[51],{"slug":170,"title":171,"description":172,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":173,"lastUpdatedDate":174,"draft":46,"category":47,"image":42,"faq":175,"tags":182},"bird-seed-agar-principle-composition-uses","Bird Seed Agar (Niger Seed Agar): Composition, Uses, and Cryptococcus Identification","\u003Cp>Bird seed agar selectively detects \u003Cem>Cryptococcus neoformans\u003C\u002Fem> by its brown-black melanin production from caffeic acid. Learn the principle, composition, colony appearance, and how it differentiates \u003Cem>C. neoformans\u003C\u002Fem> from other \u003Cem>Cryptococcus \u003C\u002Fem>species.\u003C\u002Fp>","2018-10-31","2026-08-17",[176,179],{"question":177,"answer":178},"\u003Cp>How does bird seed agar identify \u003Cem>Cryptococcus neoformans\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>Bird seed agar (Niger seed\u002FStaib medium) contains caffeic acid derived from Guizotia abyssinica (Niger seeds). \u003Cem>Cryptococcus neoformans\u003C\u002Fem> possesses the enzyme laccase (phenol oxidase), which oxidises caffeic acid to melanin. This melanin deposits in the cell wall, producing distinctive brown-black colonies within 72 hours to 5 days at 30°C. Most other pathogenic yeasts, including all \u003Cem>Candida\u003C\u002Fem> species, lack laccase and remain white or cream colored. The brown-black colony color on bird seed agar is essentially diagnostic for \u003Cem>Cryptococcus neoformans\u003C\u002Fem> or \u003Cem>C. gattii\u003C\u002Fem> (both possess laccase) in the clinical laboratory.\u003C\u002Fp>",{"question":180,"answer":181},"\u003Cp>Can bird seed agar differentiate \u003Cem>Cryptococcus neoformans\u003C\u002Fem> from \u003Cem>Cryptococcus gattii\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>No. Both \u003Cem>C. neoformans\u003C\u002Fem> and \u003Cem>C. gattii \u003C\u002Fem>produce laccase and give identical brown-black colonies on bird seed agar. They cannot be differentiated by this medium alone. Differentiation requires CanaVanine-Glycine-Bromothymol blue (CGB) agar: \u003Cem>C. gattii \u003C\u002Fem>grows on CGB agar and turns the medium blue (produces ammonia from glycine), while \u003Cem>C. neoformans \u003C\u002Fem>does not grow on CGB. This distinction matters clinically because \u003Cem>C. gattii \u003C\u002Fem>primarily infects immunocompetent hosts (unlike\u003Cem> C. neoformans\u003C\u002Fem> which predominantly causes disease in immunocompromised patients), affects different geographic areas, and may respond differently to antifungal therapy.\u003C\u002Fp>",[51],{"slug":184,"title":185,"description":186,"seoTitle":42,"seoDescription":42,"author":57,"createdDate":187,"lastUpdatedDate":59,"draft":46,"category":60,"image":42,"faq":188,"tags":204},"dermatophyte-test-medium-dtm-composition-preparation-and-uses","Dermatophyte Test Medium (DTM): Composition, Preparation, and the Pathogens It Can Miss","Why a clean, unchanged DTM tube after two weeks doesn't always mean no fungal infection, the color-change logic explained, and the one ingredient that can silently suppress a true pathogen along with the contaminants.","2021-01-30",[189,192,195,198,201],{"question":190,"answer":191},"What is Dermatophyte Test Medium (DTM) used for?","Screening for dermatophytes (ringworm-causing fungi) in samples like hair, skin scrapings, or nail clippings, using a color change from yellow to red\u002Fpink as the presumptive positive signal.",{"question":193,"answer":194},"Why does DTM turn red when dermatophytes grow?","Dermatophyte metabolism shifts the medium's pH alkaline, and the phenol red indicator turns pink at pH ≥ 8.2. Saprophytic fungi, by contrast, ferment sugars into acid and leave the medium yellow.",{"question":196,"answer":197},"Can DTM give a false negative result?","Yes. Cycloheximide, included to suppress saprophytic contaminants, can also suppress genuine pathogenic fungi that happen to be cycloheximide-sensitive, producing a \"no growth\" result indistinguishable from a true negative.",{"question":199,"answer":200},"Should DTM be used as the only fungal culture medium?","No. It should be paired with a cycloheximide-free medium whenever a broader fungal differential is clinically relevant, to avoid missing a cycloheximide-sensitive true pathogen.",{"question":202,"answer":203},"Why should DTM results be read within two weeks?","Because incubation beyond two weeks increases the risk of false positives, as slow-growing saprophytic fungi can eventually produce alkaline byproducts too.",[51,205],"dermatophytes",{"enabled":207,"threads":208,"total":209},true,[],0,[211,217,224,230,236,241,247,252,258,261,267],{"slug":212,"name":57,"description":213,"image":214,"body":215,"postCount":216},"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.*",479,{"slug":218,"name":219,"description":220,"image":221,"body":222,"postCount":223},"ashma-shrestha","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.",78,{"slug":225,"name":119,"description":226,"image":227,"body":228,"postCount":229},"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":231,"name":232,"description":226,"image":233,"body":234,"postCount":235},"samikshya-acharya","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":237,"name":238,"description":226,"image":42,"body":239,"postCount":240},"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":242,"name":243,"description":244,"image":42,"body":245,"postCount":246},"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":248,"name":249,"description":250,"image":42,"body":42,"postCount":251},"guest-author","Guest Author","Guest Author \u002F Contributor",1,{"slug":253,"name":254,"description":226,"image":255,"body":256,"postCount":257},"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":259,"name":260,"description":250,"image":42,"body":42,"postCount":251},"dr-poonam-acharya","Dr. Poonam Acharya",{"slug":262,"name":43,"description":263,"image":264,"body":265,"postCount":266},"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.*",54,{"slug":268,"name":269,"description":270,"image":271,"body":272,"postCount":251},"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.",[274,281,287,292,297,302,306,310,314,319,323,328,332,336,341,345,349,353,358,363,367,371,375,380,384,388,392,396,401,406,410,414,418,423,426,430,434,438,442,446,450,454,458,462,466,470,473,477,481,485,489,493,497,501,505,509,513,517,521,525,529,533,537,541,545,549,553,557,560,564,567,570,573,576,579,582,584,587,590],{"slug":275,"name":276,"description":277,"image":278,"body":279,"postCount":280},"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.",14,{"slug":282,"name":283,"description":284,"image":42,"body":285,"postCount":286},"microscopy","Microscopy","Microscope types, components, and microscopy techniques","These are list of blog posts related to microscopy. ",12,{"slug":288,"name":289,"description":290,"image":42,"body":42,"postCount":291},"gram-positive-cocci","Gram-Positive Cocci","Staphylococcus, Streptococcus, Enterococcus, Micrococcus — organisms, diseases, and identification tests",11,{"slug":293,"name":294,"description":295,"image":42,"body":42,"postCount":296},"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":298,"name":299,"description":300,"image":42,"body":42,"postCount":301},"gram-positive-rods","Gram-Positive Rods","Bacillus, Clostridium, Listeria, Corynebacterium, Actinomyces and related organisms",8,{"slug":303,"name":304,"description":305,"image":42,"body":42,"postCount":291},"mycobacteria","Mycobacteria","Mycobacterium tuberculosis, leprosy, atypical mycobacteria, and acid-fast organism diagnosis",{"slug":307,"name":308,"description":309,"image":42,"body":42,"postCount":291},"anaerobic-bacteriology","Anaerobic Bacteriology","Anaerobic organisms, anaerobic culture methods, and anaerobic infection diagnosis",{"slug":311,"name":312,"description":313,"image":42,"body":42,"postCount":286},"enterobacteriaceae","Enterobacteriaceae","Identification, differentiation, and clinical significance of Enterobacteriaceae family members",{"slug":315,"name":316,"description":317,"image":42,"body":42,"postCount":318},"spirochetes","Spirochetes","Treponema, Leptospira, Borrelia and spirochetal infections",7,{"slug":320,"name":321,"description":322,"image":42,"body":42,"postCount":257},"food-microbiology","Food Microbiology","Food-borne pathogens, food safety, spoilage, and preservation",{"slug":324,"name":325,"description":326,"image":42,"body":42,"postCount":327},"antimicrobial-susceptibility-testing","Antimicrobial Susceptibility Testing","Methods for testing antibiotic susceptibility in clinical microbiology",21,{"slug":329,"name":330,"description":331,"image":42,"body":42,"postCount":246},"antimicrobials-moa-amr","Antimicrobials (MOA & AMR)","Mechanisms, detection, and clinical significance of antimicrobial resistance",{"slug":113,"name":333,"description":334,"image":42,"body":42,"postCount":335},"Sterilization and Disinfection","Methods of sterilization and disinfection in healthcare and laboratory settings",10,{"slug":337,"name":338,"description":339,"image":42,"body":42,"postCount":340},"specimen-collection-transport","Specimen Collection and Transport","Collection, handling, and transport of clinical specimens for microbiological testing",27,{"slug":342,"name":343,"description":344,"image":42,"body":42,"postCount":327},"bacterial-structure-physiology","Bacterial Structure and Physiology","Bacterial cell structure, growth, physiology, and environmental factors affecting growth",{"slug":346,"name":347,"description":42,"image":42,"body":348,"postCount":240},"horizontal-gene-transfer","Horizontal Gene Transfer","Articles related to **Horizontal Gene Transfer**",{"slug":350,"name":351,"description":42,"image":42,"body":352,"postCount":335},"chromatography","Chromatography","Information about chromatographic techniques.",{"slug":354,"name":355,"description":356,"image":42,"body":357,"postCount":318},"electrophoresis","Electrophoresis","Information about Electrophoresis Techniques ","Detailed information  about Electrophoresis Techniques ",{"slug":359,"name":360,"description":361,"image":42,"body":362,"postCount":240},"pcr-techniques","PCR Techniques","Information about various types of Polymerase Chain Reaction Techniques ","More detailed information about various types of Polymerase Chain Reaction Techniques ",{"slug":364,"name":365,"description":366,"image":42,"body":42,"postCount":240},"bacteriophage","Bacteriophage","Description about Bacteriophage.",{"slug":368,"name":369,"description":370,"image":42,"body":42,"postCount":240},"malaria","Malaria","It is the collections of articles regarding malarial disease. ",{"slug":372,"name":373,"description":374,"image":42,"body":42,"postCount":240},"anaerobic-culture-techniques","Anaerobic Culture Techniques","Posts related with Anaerobic Culture Techniques.",{"slug":376,"name":377,"description":378,"image":42,"body":42,"postCount":379},"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.",19,{"slug":381,"name":382,"description":383,"image":42,"body":42,"postCount":318},"biosafety-levels","Biosafety levels ","Articles related to Biosafety Levels",{"slug":385,"name":386,"description":387,"image":42,"body":42,"postCount":296},"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":389,"name":390,"description":391,"image":42,"body":42,"postCount":240},"pipette","Pipette","Posts related with Pipette. ",{"slug":393,"name":394,"description":395,"image":42,"body":42,"postCount":301},"bacteriology-mcqs","Bacteriology MCQs","This sections lists MCQs in Bacteriology.",{"slug":397,"name":398,"description":399,"image":42,"body":42,"postCount":400},"parasitology-mcqs","Parasitology MCQs","This section lists MCQs in Parasitology.",2,{"slug":402,"name":403,"description":404,"image":42,"body":42,"postCount":405},"virology-mcqs","Virology MCQs","This is the collections of Multiple Choice Questions in Virology.",4,{"slug":407,"name":408,"description":409,"image":42,"body":42,"postCount":296},"mcqs-in-microbiology","MCQs in Microbiology","This section lists the collections of Multiple Choice Questions in General Microbiology Topics. ",{"slug":411,"name":412,"description":413,"image":42,"body":42,"postCount":301},"immunology-mcqs","Immunology MCQs","In this section; we are posting collections of Multiple Choice Questions about Immunology. ",{"slug":415,"name":416,"description":417,"image":42,"body":42,"postCount":246},"microbial-curiosities","Microbial Curiosities","In this clusters, we are posting interesting and unique information about Microorganisms. ",{"slug":419,"name":420,"description":421,"image":42,"body":42,"postCount":422},"bacterial-culture-media","Bacterial Culture Media","Posts related to Bacterial Culture Media. ",23,{"slug":51,"name":424,"description":425,"image":42,"body":42,"postCount":240},"Fungal Culture Media","Posts related to Fungal Culture Media.",{"slug":427,"name":428,"description":429,"image":42,"body":42,"postCount":296},"motility-test","Motility Test","This lists the procedure regarding various tests methods for bacterial motility.",{"slug":431,"name":432,"description":433,"image":42,"body":42,"postCount":335},"bacterial-enumeration","Bacterial enumeration","These posts are related to isolation and enumeration of bacteria. ",{"slug":435,"name":436,"description":437,"image":42,"body":42,"postCount":400},"gram-positive-coccobacillus","Gram-positive coccobacillus","List of Gram Positive Coccobacilli",{"slug":439,"name":440,"description":441,"image":42,"body":42,"postCount":405},"dimorphic-fungi","Dimorphic Fungi","This is about various dimorphic fungi. ",{"slug":443,"name":444,"description":445,"image":42,"body":42,"postCount":318},"bacterial-classification","Bacterial Classification","These posts are related with various approaches used for the classification of Bacteria. ",{"slug":447,"name":448,"description":449,"image":42,"body":42,"postCount":296},"immunofluorescence","Immunofluorescence ","Various Tests related to Immunofluorescence ",{"slug":451,"name":452,"description":453,"image":42,"body":42,"postCount":246},"antibody-mediated-immunity","Antibody-mediated Immunity","This clusters links the articles that are sharing insights about Antibody-mediated immunity. ",{"slug":455,"name":456,"description":457,"image":42,"body":42,"postCount":318},"hypersensitivity","Hypersensitivity","Articles related to Hypersensitivity.",{"slug":459,"name":460,"description":42,"image":42,"body":42,"postCount":461},"haemophilus","Haemophilus",3,{"slug":463,"name":464,"description":465,"image":42,"body":42,"postCount":405},"sexually-transmitted-infections-stis","Sexually transmitted infections (STIs)","This is the clusters of infections that are transmitted sexually. ",{"slug":467,"name":468,"description":469,"image":42,"body":42,"postCount":286},"adaptive-immunity","Adaptive Immunity","Blog posts related to B Cell Immunity and T Cell Immunity.",{"slug":78,"name":471,"description":472,"image":42,"body":42,"postCount":280},"Fungal Diagnostics","Various methods used for the Diagnosis of Fungal Infections. ",{"slug":474,"name":475,"description":476,"image":42,"body":42,"postCount":296},"laboratory-storage-and-preservation","Laboratory Storage and Preservation","Articles about Laboratory Storage of Antimicrobial Disk, Test organisms and Equipment used for this process. ",{"slug":114,"name":478,"description":479,"image":42,"body":480,"postCount":240},"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":482,"name":483,"description":484,"image":42,"body":42,"postCount":246},"laboratory-glassware","Laboratory Glassware","Posts about Laboratory Glassware. ",{"slug":486,"name":487,"description":488,"image":42,"body":42,"postCount":240},"helminths","Helminths","In this section, we are covering properties, life cycle, pathogenesis and laboratory diagnosis of Helminths\u002FHelminthic infestations. ",{"slug":490,"name":491,"description":492,"image":42,"body":42,"postCount":318},"protozoan-parasite","Protozoan Parasite","In this cluster, we are covering protozoan parasites. ",{"slug":494,"name":495,"description":496,"image":42,"body":42,"postCount":251},"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":498,"name":499,"description":500,"image":42,"body":42,"postCount":335},"bacterial-staining-technique","Bacterial Staining Technique","Lists of various staining techniques that are used to stain bacteria. ",{"slug":502,"name":503,"description":504,"image":42,"body":42,"postCount":327},"enzyme-tests","Enzyme Tests","\u003Cp>Various Biochemical Test that are based on enzymatic activity of the microorganisms. \u003C\u002Fp>",{"slug":506,"name":507,"description":508,"image":42,"body":42,"postCount":291},"carbohydrate-utilization","Carbohydrate Utilization","\u003Cp>Various biochemical tests which are related to Carbohydrate fermentation or Utilization\u003C\u002Fp>",{"slug":510,"name":511,"description":512,"image":42,"body":42,"postCount":296},"susceptibility-based-id","Susceptibility-based ID","\u003Cp>These are susceptibility based identification test such as optochin sensitivity, bacitracin sensitivity etc. \u003C\u002Fp>",{"slug":514,"name":515,"description":516,"image":42,"body":42,"postCount":405},"microbial-metabolism","Microbial Metabolism","\u003Cp>Tests about Microbial Metabolism. \u003C\u002Fp>",{"slug":518,"name":519,"description":520,"image":42,"body":42,"postCount":301},"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":522,"name":523,"description":524,"image":42,"body":42,"postCount":461},"atypical-pneumonia","Atypical Pneumonia","\u003Cp>Organisms responsible for Atypical Pneumonia. \u003C\u002Fp>",{"slug":526,"name":527,"description":528,"image":42,"body":42,"postCount":296},"antigen","Antigen","\u003Cp>Various articles related to Antigens.\u003C\u002Fp>",{"slug":530,"name":531,"description":532,"image":42,"body":42,"postCount":318},"innate-immunity","Innate Immunity","\u003Cp>Articles related to Innate Immunity. \u003C\u002Fp>",{"slug":534,"name":535,"description":536,"image":42,"body":42,"postCount":405},"respiratory-tract-infection","Respiratory Tract Infection","\u003Cp>In this cluster, you can see various etiological agents that causes respiratory tract infection. \u003C\u002Fp>",{"slug":538,"name":539,"description":540,"image":42,"body":42,"postCount":296},"torch-infection","TORCH Infection","\u003Cp>In this section; you can find articles related with TOCH infection. \u003C\u002Fp>",{"slug":542,"name":543,"description":544,"image":42,"body":42,"postCount":318},"microbiology-for-beginners","Microbiology for Beginners","\u003Cp>These articles are very basic articles, which will share general concepts in Microbiology. \u003C\u002Fp>",{"slug":546,"name":547,"description":548,"image":42,"body":42,"postCount":240},"dna-replication","DNA Replication","\u003Cp>Articles related to DNA and Replication of DNA. \u003C\u002Fp>",{"slug":550,"name":551,"description":552,"image":42,"body":42,"postCount":318},"genetic-code","Genetic Code","\u003Cp>Articles related to Genetic Code.\u003C\u002Fp>",{"slug":554,"name":555,"description":556,"image":42,"body":42,"postCount":296},"molecular-technique","Molecular Technique","\u003Cp>Posts related to Molecular Techniques. \u003C\u002Fp>",{"slug":558,"name":559,"description":42,"image":42,"body":42,"postCount":251},"colorimetric-assay","Colorimetric Assay ",{"slug":561,"name":562,"description":563,"image":42,"body":42,"postCount":296},"pharmaceutical-microbiology","Pharmaceutical Microbiology","\u003Cp>Various articles related to Pharmaceutical Microbiology\u003C\u002Fp>",{"slug":565,"name":566,"description":42,"image":42,"body":42,"postCount":461},"blood-and-immune-cells","Blood and Immune Cells",{"slug":568,"name":569,"description":42,"image":42,"body":42,"postCount":296},"host-pathogen-interaction","Host Pathogen Interaction",{"slug":571,"name":572,"description":42,"image":42,"body":42,"postCount":405},"blood-culture","Blood Culture",{"slug":574,"name":575,"description":42,"image":42,"body":42,"postCount":405},"environmental-microbiology","Environmental microbiology ",{"slug":577,"name":578,"description":42,"image":42,"body":42,"postCount":240},"copromicroscopic-technique","Copromicroscopic Technique",{"slug":580,"name":581,"description":42,"image":42,"body":42,"postCount":461},"quality-control","Quality Control",{"slug":205,"name":583,"description":42,"image":42,"body":42,"postCount":405},"Dermatophytes",{"slug":585,"name":586,"description":42,"image":42,"body":42,"postCount":461},"viral-hemorrhagic-fevers","Viral Hemorrhagic Fevers",{"slug":588,"name":589,"description":42,"image":42,"body":42,"postCount":405},"h2s-production","H2S Production",{"slug":591,"name":592,"description":42,"image":42,"body":42,"postCount":400},"water-quality-testing","Water Quality Testing"]