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Pulsating response to stress in bacteria

By attaching fluorescent proteins to the genetic circuit responsible for B. subtilis's stress response, researchers can observe the cells' pulses as green flashes.

In response to a stressful environment like one lacking food, B. subtilis activates a large set of genes that help it respond to ... Read More

Aspergillus spp.

(Eurodium) Sexual phase of Aspergillus spp. Asci and ascospores Read More

Swarm of paramecia surrounding an unidentified protozoan

Swarm of paramecia surrounding an unidentified protozoan. From the Wistreich Collection. Read More

Quantitative precipitin test

Quantitative precipitin test. Constant antibody with 2-fold increase in antigen concentration. Note inhibition in antigen excess and precipitation in equivalence zone. Read More

Microscopy Slide Show

Nature has just published a news special on microscopes and microscopy. Most of the associated articles are pay-per-view but the slideshow of images is free to check out. Click the source link above. Read More

photograph of carcass of swine showing lesions of swine erysipelas (b&w)

photograph of carcass of swine showing lesions of swine erysipelas (b&w) Read More

Gram stain of mixed culture of cocci and rods

Gram stain of mixed culture of cocci and rods.Streptobacillus morphological arrangement is shown. (Approx X1000). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

Influenza Virus

Electron micrograph of influenza virus negatively stained with phosophotungstic acid Read More

Absidia sp.

Absidia sp. Interference phase microscopy (1000X) Read More

Nitrification floc.

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

Plasmodium vivax

Plasmodium vivax mature schizont (1000X) Read More

Activated Sludge

Activated sludge. Stalked ciliates grazing the sludge material (1000X) Read More

Haematococcus pluvialis

Phase contrast image of fresh water unicellular algae Haematococcus pluvialis colelcted at 100X. This species is well known for its high content of the strong antioxidant astaxanthin, which is important in aquaculture, various pharmaceuticals, and cosmetics. Fourth Prize, 2009 Olympus BioScapes ... Read More

Bacteroides fragilis colonies on blood agar

Bacteroides fragilis colonies on blood agar (1:5) Read More

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

Mycobacterium tuberculosis. young colony on a brain heart infusion. typical virulent strain

Mycobacterium buberculosis. young colony on a brain heart infusion. typical virulent strain Read More

SEM showing bacteria in close association with human intestinal brush border cells (12000X)

SEM showing bacteria in close association with human intestinal brush border cells (12000X) Read More

Infected guinea pig eye Shigella - Sereny test

Infected guinea pig eye Shigella - Sereny test Read More

photograph of the skin lesions in man with the septicemic type of infection with erysipelothrix rhusiopathiae

photograph of the skin lesions in man with the septicemic type of infection with erysipelothrix rhusiopathiae Read More

Absidia sp.

Absidia sp. Unstained, interference phase Read More

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