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2009 MicrobeLibrary Editor's Choice Award Winner: Fruiting Bodies and Mature Basidiospores of the Stalked Puffball Mushroom, Calostoma sp.

Each year the ASM's MicrobeLibrary Visual Collection Editorial Committee presents the Editor's Choice Award to three visual resources (one animation, one still image, and one video) published over the past year. The chosen resources exemplify the criteria for publication in the MicrobeLibrary. T... Read More

Tube morphology

Three organisms inoculated in TSB to look at tube morphology. From left to right:
Staphylococcus aureus: flocculent growth/turbid, growth throughout the tube.
Mycobacterium smegmatis: pellicle, growth at the top of the tube. M. smegmatis tends to stick to the tube and grow up the side.
Ba... Read More

Shoe Swab

Unknown organism isolated from a swab taken off the bottom of a shoe. Students were asked to swab something in the classroom. One swab was done on the bottom of a shoe and incubated on a TSA plate for 48 hrs at 37 degree’s C. The organism was difficult to scrape so a small chunk of the organis... Read More

Aspergillus fumigatus

Fragments from above compost pile, covered with Aspergillus fumigatus Read More

Salmonella grown on Salmonella-Shigella (S-S) Agar

The following picture shows the isolated black colonies of Salmonella on Salmonella-Shigella (S-S) Agar. S-S Agar is used as a selective and differential medium for the isolation of Salmonella and some Shigella species. The inclusion of bile salts is to inhibit gram-positive organisms. Ferric ci... Read More

Beauty of Nocardia asteroides Colonies on Blood Agar

Nocardia asteroides isolation from blood specimen. On culture, chalky white colonies were seen on blood agar. Image courtesy MicrobeWorld user Kyriakos Zaragkoulias, Specialty Registrar (StR) in Medical Microbiology at General Hospital of Thessaloniki “G. Papanikolaou”, Greece.


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HIV-infected H9 T Cell

Scanning electron micrograph of an HIV-infected H9 T cell. Credit: National Institutes of Health/Department of Health and Human Services (NIAID). Read More

Multidrug resistance Pseudomonas aeruginosa

Pseudomonas aeruginosa is one of the most notorious organisms that have brought the therapeutic dilemmas to clinicians as well as challenge to microbiologist throughout the world. It carries gene of intrinsic resistance (AmpC cephalosporinase, the OprD outer membrane porin, and the multidrug ef... Read More

Listeria monocytogenes on chromogenic agar

It's Friday and I can finally enjoy the beach! So I thought it would be nice to reflect my excitement at work growing this happy Listeria monocytogenes ;) Read More

"Come over baby/whole lot of shakin' goin' on"

Perhaps Jerry Lee Lewis's rock n' roll classic will soon be topping the charts of virologists world wide! Read More

Methyl Red/Vogoes-Proskauer (MR-VP)

Methyl Red/Vogoes-Proskauer (MR-VP)
One medium used for two separate but related tests, identifying butanediol (VP) or acidic fermentation products (MR) as part of the IMViC test used in the identification of Enterobacteriaceae.

•Methyl Red (MR): detects the ability of an organism to produc... Read More

Evidence-based antibiotic usage

New recommendation encourages physicians to prescribe _antibacterials_ instead of antibiotics for bacterial infections. This recommendation is based on compelling evidence that the word "antibiotic" confuses almost everyone, including some doctors. The confusion leads to strong patient demands... Read More

Bacitracin test on Streptococcus pyogenes

Bacitracin test done on a lawn of Streptococcus pyogenes grown on blood agar. The zone of inhibition around the bacitracin disc, approx 14mm measuring the entire length of the zone, indicates sensitivity. The zone of inhibition is red because the red blood cells did not lyse. Grown for 24 hr... Read More

Worms from Hell lecture at the Smithsonian (Picture)

(From left to right) NASA astrobiologist Danny Glavin, science writer Marc Kaufman, and geomicrobiologist and Princeton University professor Tullis Onstott, take questions from the audience at last night's Smithsonian-sponsored evening lecture entitled "Worms from Hell" that focused on the lates... Read More

Neoscytalidium dimidiatum arthrospore

It is a well recognized uncommon cause of skin and nail infection of the hands and feet . Unlike Dermatophytosis these mould infections are not contagious. There are few reports of invasive infection caused by N. dimidiatum; most infections occurred in immunocompromised hosts. Arthrospores are ... Read More

Unknown environmental Contaminant on blood agar plate streaked with S. pyogenes

A streak plate of Strep pyogenes on blood agar, stock culture used for class, was kept at room temp for 1 month. Before disposal a contaminant, presumably environmental, was seen on the plate. The pigment was opaque tan/yellow and with a mucoid surface. Lobate marigins with raised irregular-rh... Read More

Bacillus subtilis

Streak plate isolation showing colonial morphology of Bacillus subtilis on trypticase soy agar (TSA) incubated for 24 hours at 37oC. Note the rough and dry/matte texture characteristic of this organism’s growth. Read More

Salmonella sp.

Salmonella sp. on XLT4 agar and Miller Mallinson Agar Read More

Herpes simplex, type 1

Herpes simplex, type 1. Isolate in human fetal diploid cell cultures, identified by direct FA staining (R.W. Emmons) Read More

Bacillus subtilis

Gram stain of B. subtilis showing characteristic G +streptobacillus morphology. Read More
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