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Streptococcal bacteria

This image depicts the quantitative difference in hemolytic reactivity seen in a trypticase soy agar culture plate containing 5% sheep’s blood growing group-D Streptococci (left wedge), group-B Streptococci (middle wedge), and group-A Streptococci (right wedge) bacteria. This plate was grown u... Read More

Tropical Fish and Bacterial Mat

At East Diamante volcano (195 m, 640 ft depth), tropical fish swim above boulders covered with bacterial mat, which indicates the presence of hydrothermal venting. These fish live in the reef community above and are about 15 cm long (6 in). Read More

Euglena species

Microscopic view of a swarm of Euglena species. (approx. X 100). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Arsenic Tolerant Plant

The sporophyte of the fern Pteris vittata, which tolerates and accumulates very high levels of the deadly toxin arsenic. Researchers from Purdue University have identified a gene (ACR3) from P. vittata that is necessary for the plant's tolerance to arsenic.

Jody Banks, professor of botany an... Read More

Halloween microbes

Strep agalactiae (Group B Strep) streaked out on Granada plates. Usually this media is used to screen for Group B in pregnant patients, the strep will grow as bright orange colonies while any other growth will be colorless. Perfect for a little Halloween fun...follow me on instagram @stylish_str... Read More

Gram-negative rods

Gram-negative rods. (approx. 1000 X). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Sebaldella termitidis bacteria

This digitally-colorized scanning electron micrograph (SEM) depicted a small grouping of Gram-negative Sebaldella termitidis bacteria.
Recently, “the genome of ATCC 33386 S. termitidis was recently sequenced as part of the U.S. Department of Energy - Joint Genome Institute’s (DOE-JGI) Genomic E... Read More

Rockweed algae

Rockweed algae on rocks in cold ocean water. From the Wistreich Collecction, appearing exclusively on MicrobeWorld. Read More

Filamentous bacterium

Raw sewage. Filamentous bacterium, note the polymeric material Read More

1918 influenza virions

This negative stained transmission electron micrograph (TEM) shows recreated 1918 influenza virions that were collected from supernatants of 1918-infected Madin-Darby Canine Kidney (MDCK) cells cultures 18 hours after infection.

To separate these virions, the MDCK cells are spun down (centrif... Read More

Unknown - Identification Help Please

I am in need of some assistance in Identifying a bacteria species. I am unable to locate a match in Bergey's Manual. Our copy is 20 years out of date. I know the photo isnt great, it was taken with a cell phone. The colonies are hot pink and were cultured on TSA slant. It is gram + micrococci, i... Read More

Contaminant snowman

Some holiday fun from last winter composed of different collected plate contaminants. Based on colony morphology and wet mounts, these bacteria are likely to be: Staphylococcus sp. (white), Serratia marcescens (dark orange), and Micrococcus luteus (creamy yellow). The design was incubated for 5-... Read More

Mycobacterium tuberculosis. Young colony on brain heart infusion. A virulent strain

Mycobacterium tuberculosis. Young colony on brain heart infusion. A virulent strain Read More

Escherichia coli

Escherichia coli showing lactose fermentation EMB agar. Note green sheen on colony. Read More

Coiled filamentous cyanobacterium Anabaena sp.

Nikon Small World Honorable Mention 2008 photomicrography competition, Dr. Petr Znachor, Institute of Hydrobiology, Ceske Budejovice, Czech Republic

Coiled filamentous cyanobacterium Anabaena sp. (600x)
Technique: Nomarski Differential Interference Contrast Read More

The incredible tiny world of microbiology

The winners of Olympus' annual live sciences photography competition are in, with the top 10 submissions revealing an entire world of microscopic wonder.

It's the 10th year of Olympus' BioScapes international digital-imaging competition — where photographers from around the globe can send in ... Read More

Bacteroides fragilis

Bacteroides fragilis in a roll tube culture Read More

Trichophyton mentagrophytes

Trichophyton mentagrophytes colony on Sabouraud's agar (1.54) Read More

Mycobacterium tuberculosis culture

This is a close-up of a Mycobacterium tuberculosis culture revealing this organism’s colonial morphology.

Note the colorless rough surface, which are typical morphologic characteristics seen in Mycobacterium tuberculosis colonial growth. Macroscopic examination of colonial growth patterns is ... Read More


Researchers have discovered the largest virus ever, and they've given it a terrifying name: Pandoravirus.

A typical virus is a tiny sack of genetic material that injects itself into a much larger cell and uses it to make more viruses. The Pandoravirus is enormous by comparison—large enough to... Read More
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