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Coloured TEM of a group of Coxsackie viruses

Coxsackie viruses. Coloured transmission electron micrograph (TEM) of a group of Coxsackie viruses. These viruses were named after the town in the USA where they were isolated. They are entero- viruses, part of the Picornaviridae group. This group contains small, non-enveloped, icosahedral- shap... Read More

Virions of a hantavirus known as the Sin Nombre virus (SNV).

This transmission electron micrograph (TEM) revealed the ultrastructural appearance of a number of virus particles, or “virions”, of a hantavirus known as the Sin Nombre virus (SNV).

In November 1993, the specific hantavirus that caused the Four Corners outbreak was isolated. Using tissue fro... Read More

Micrococcus lutea

Gram-stain of Micrococcus lutea. (approx. 1000 X). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Micrococcus luteus

Safranin-stained Micrococcus luteus showing sarcinae and other arrangements. (approx. 1000 X). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Mycobacterium fortuitum

Under a magnification of 3841X, this scanning electron micrograph SEM) revealed some of the ultrastructural morphologic details exhibited by a number of Gram-positive bacilli, or “rod-shaped”, Mycobacterium fortuitum bacteria.

M. fortuitum is classified as a “rapidly-growing” Mycobacterium, ... Read More

Acid-fast rods

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

Trichomonas vaginalis Parasite

An electron micrograph depicts the Trichomonas vaginalis parasite adhering to vaginal epithelial cells collected from vaginal swabs. A non-adhered parasite (right) is pear-shaped, whereas the attached parasite is flat and amoeboid.

Credit: Image courtesy of: Antonio Pereira-Neves and Marlene... Read More

Non-acid-fast rods

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

Gram-stained preparation of Bacillus subtilis

Gram-stained preparation of Bacillus subtilis showing rods, and spores (empty areas). (approx. 1000 X). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Entamoeba

Entamoeba, an amoeba that includes pathogens of the intestinal tracts of a range of hosts - humans are included. They have no mitochondria and seem to have adapted secondarily to an anoxic way of life. Cytoplasm of a thick and dense consistency, and like that of pelobionts (to which we think the... Read More

Viruses in Yellowstone

Viruses are not usually regarded as living cells. A virus 'particle' requires a living host cell in order to reproduce. Although we usually think of viruses as causing diseases, they also are an integral part of natural ecosystems controlling the size of bacterial populations by preying on them.... Read More

Gram-negative rods

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

Salmonella typhi.

Flagella stain of Salmonella typhi. (approx. 1000 X). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Engineered Ecosystem

“Predator” bacteria (green) surround “prey” bacteria (red) in this petri dish version of the Serengeti. Rather than eating their prey, however, predator cells release a chemical that activates a suicide gene in the prey. Prey cells also release a chemical, but one that promotes survival of the p... Read More

Gram-negative rods and coccobacilli

Gram-negative rods and coccobacilli. (Proteus vulgaris) (approx X1000). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Fighting Infection by Clonal Selection

In 1960, Australian immunologist Frank Burnet won a Nobel Prize for his contributions to immunology. Etsuko Uno and colleagues at the Walter and Eliza Hall Institute of Medical Research in Melbourne, Australia, explain Burnet's clonal selection theory in an animation of the body's response to St... Read More

Gram-negative rods

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

Treponema pallidum

Dark-field preparation of Treponema pallidum. (approx X1000). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Crystal violet stained cocci

Crystal violet stained cocci. Tetrads, and diplococcal and staphylococcal arrangements are present. (approx. 1000 X). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Vibrio vulnificus

This scanning electron micrograph (SEM) depicts a grouping of Vibrio vulnificus bacteria; Mag. 13184x.
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" because they ... Read More
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