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Viral desserts

At the Harvard Virology Program Retreat for 2011, the students ran a viral dessert contest. I posted some of the images at VirusTalk. Have a look at them – they are truly delicious. Read More

Nitrification floc

Nitrification floc. Note the unusual crown shaped bacterium (11000X) Read More

Gram-positive Listeria monocytogenes

Microscopic view of gram-positive Listeria monocytogenes (rods) (approx. original X 1,000). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

The actin-based movement of Listeria monocytogenes within and between host cells

These bacteria induce the assembly of actin-rich tails in the host cell cytoplasm, which enable them to move rapidly. Motile bacteria spread from cell to cell by forming membrane-enclosed protrusions that are engulfed by neighboring cells. (B) Fluorescence micrograph of the bacteria moving in a ... Read More

Mycoplasma - adhesion of symbiont infection structure to host

This scanning electron micrograph shows mycoplasma (colorized pink), a genus of bacteria that lack a cell wall. Without a cell wall they are unaffected by many common antibiotics, such as penicillin, or other beta-lactam antibiotics that work by targeting cell wall synthesis. These mycoplasma ar... Read More

A single virus particle, or “virion”, of measles virus

This thin-section transmission electron micrograph (TEM) revealed the ultrastructural appearance of a single virus particle, or “virion”, of measles virus. The measles virus is a paramyxovirus, of the genus Morbillivirus. It is 100-200 nm in diameter, with a core of single-stranded RNA, and is c... Read More

Vibrio vulnificus bacterium

This colorized scanning electron micrograph (SEM) depicted a flagellated Vibrio vulnificus bacterium; Mag. 26367x.

Vibrio vulnificus is a bacterium in the same family as those that cause cholera. It normally lives in warm seawater and is part of a group of vibrios that are called "halophilic"... Read More

Chlamydospores of Candida albicans

Chlamydospores of Candida albicans Read More

MPN test for water pollution

MPN test for water pollution (heavily contaminated) Read More

Clostridium botulinum from food 1000x

Clostridium botulinum from food 1000x Read More

Clostridium perfringens

Clostridium perfringens. India ink preparation showing capsules Read More

Haemophilus haemolyticus

Haemophilus haemolyticus. Blood agar colonies. Read More

Staphylococcus aureus bacteria, MRSA

Recently recognized outbreaks, or clusters of MRSA in community settings have been associated with strains that have some unique microbiologic and genetic properties, compared with the traditional hospital-based MRSA strains, which suggests some biologic properties, e.g., virulence factors like ... Read More

Fusobacterium russii

This is a photomicrograph of Fusobacterium russii cultured in a thioglycollate medium for 48 hours.

Like the genus Bacteroides, Fusobacterium are anaerobic, gram-negative bacteria that are normal inhabitors of the intestine. Fusobacterium spp. are associated with pleuropulmonary and oral infe... Read More

Colonies of Bacteria Do Battle - Paenibacillus dendritiformis

Poisons are unleashed when colonies of bacteria get too close, creating a toxic no-man's land in between.

Research by Eshel Ben-Jacob of the University of California, San Diego's, Center for Theoretical Biological Physics, Ben-Jacob of Tel Aviv University, Avraham Be'er of the University of T... Read More

Fluid Thioglycollate Media

Organisms grown in Fluid Thioglycollate Media w/out resazurin dye is a reducing media that uses sodium thioglycollate to chemically combine with dissolved oxygen to deplete the oxygen in the media. All organism except for Neisseria sicca were grown for 48 hours at 37 degrees C. Neisseria sicca i... Read More

clostridium perfringens lecithinase activity 6x

clostridium perfringens lecithinase activity 6x Read More

Bacillus cereus on blood agar

Bacillus cereus growed at 30ºC/24 h on blood agar. Read More

Actinomyces israelii

Actinomyces israelii. Gram stain broth culture Read More

clostridium sporogenes - sporoangia and sports, crystal violet (1000x)

clostridium sporogenes - sporoangia and sports, crystal violet (1000x) Read More
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