Staph infections are caused by a strain of this bacteria. This gram-positive bacteria is typically harmless and resides on the skin and in mucous membranes. Staphylococcus microscope prepared slide image at left was captured at 400x magnification. The Sarcina prepared microscope slide at left was captured at 400x magnification. Sarcina is a gram-positive bacterium that may be found on human skin or in the large intestine. Also known as Sinorhizobium Meliloti, this gram-negative nitrogen-fixing bacterium forms a symbiotic relationship with legumes that results in a new plant organ termed a root nodule. Rhizobium Meliloti microscope prepared slide image at left was captured at 400x magnification. Rhizobium Meliloti (Nitrogen fixing in root on legume spear) The Lactobacillus microscope prepared slide image at left was captured at 400x magnification. Lactobacillus bacteria that is found in the mouth (not from yogurt bacteria) can be responsible for tooth decay and dental cavities. Most of the members of this bacteria group convert lactose to sugar and lactic acid. Lactobacillus is a gram-positive rod-shaped bacteria, and is a part of the lactic-acid bacteria group. However, over 80% of the individuals infected with Helicobacter Pylori are asymptomatic and it has been theorized that the bacterium may play an important role in natural stomach ecology. Helicobacter Pylori is a gram-negative bacterium linked to the development of duodenal ulcers and stomach cancer. The prepared microscope slide image of Helicobacter Pylori at left was captured at 400x magnification. The harmless strains are part of the normal flora of the gut. Coli strains are harmless, but some serotypes can cause food poisoning in their hosts. Coli (Escherichia Coli) is a gram-negative, rod-shaped bacterium. The prepared microscope slide image of Bacillus Subtilis at left was captured at 400x magnification. It is rod shaped and is found in the human intestines. This bacteria is known as hay bacillus or grass bacillus. Looking for a prepared slide kit? Check out our General Slide Kit. All bacteriology microscope prepared slide images below were captured using the Richter Optica U2D digital biological microscope.
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