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Microbiology Reference Libraries

Page 4 of about 145 Articles
Mycobacterium leprae
2011-04-25 15:36:41

Mycobacterium leprae, mostly found in warm tropical countries, is a bacterium that causes leprosy (Hansen's disease). It is an intracellular, pleomorphic, acid-fast bacterium. M. leprae is an aerobic rod-shaped surrounded by the characteristic waxy coating unique to mycobacteria tuberculosis. Due to its thick waxy coating, M. leprae stains with a carbol fuscin rather than with the traditional...

Mycobacterium bovis
2011-04-18 22:11:24

Mycobacterium bovis is a slow-growing, aerobic bacterium and the causative agent of tuberculosis in cattle. Similar to M. tuberculosis, M. bovis can jump the species barrier and cause tuberculosis in humans. It is estimated that M. bovis was responsible for more losses among farm animals than all other diseases combined in the first half of the 20th century. Infection happens after...

Lactobacillus casei
2011-04-18 21:59:17

Lactobacillus casei is a species of genus Lactobacillus found in the human intestine and mouth. Since it produces lactic acid it helps with the propagation of desirable bacteria. This species is documented to have a wide pH and temperature range. It also improves digestion and reduces lactose intolerance and constipation. Most often L. casei is industrial, specifically for diary production....

Lactobacillus acidophilus
2011-04-18 21:52:41

Lactobacillus acidophilus is a species in the genus Lactobacillus. It is a homo-fermentative species, fermenting sugars into lactic acid, which grows readily at rather low pH values and has an optimum growth temperature of 37 °C. It occurs naturally in the human and animal gastrointestinal tract, mouth, and vagina. Some strains have probiotic characteristics. Strains are commercially used in...

Klebsiella pneumoniae
2011-04-18 21:37:33

Klebsiella pneumoniae is a Gram-negative, non-motile, encapsulated, lactose fermenting, facultative anaerobic, rod shaped bacterium found in the normal flora of the mouth, skin, and intestines. It is the most important member of the Klebsiella genus of Enterobacteriaceae. It is naturally occurring in soil and about 30% of strains can fix nitrogen in anaerobic conditions. Hans Christian Gram...

Haemophilus influenzae
2011-04-15 15:26:30

Haemophilus influenzae is a Gram-negative, rod-shaped bacterium first described in 1892 by Richard Pfeiffer during an influenza pandemic. It is generally aerobic but can grow as a facultative anaerobe. H. influenzae was mistakenly considered to be the cause of influenza until 1933 when the flu virology became apparent. It was the first free-living organism to have its entire genome...

Gardnerella
2011-04-15 15:11:42

Gardnerella is a genus of gram-variable-staining facultative anaerobic bacteria of which G. vaginalis is the only species. It grows as small, circular, convex, gray colonies on chocolate agar. Colistin-oxolinic acid blood agar is a selective medium for G. vaginalis. Bacterial vaginosis results in some women as a result of disruption of the normal vaginal microflora. Lactobacillus population...

Francisella tularensis
2011-04-15 15:02:18

Francisella tularensis is a pathogenic species of gram-negative bacteria and the causative agent of tularemia or rabbit fever. It is a facultative intracellular bacterium. It is classified as a Class A agent by the U.S. government due to its ease of spread by aerosol and its high virulence. In 1911 the species was found in ground squirrels in California. There are four subspecies that have...

Escherichia coli
2011-04-15 14:54:29

Escherichia coli is a Gram-negative rod-shaped bacterium that is commonly found in the lower intestine of warm-blooded organisms. Most strains are harmless; however, some such as O157:H7 can cause food poisoning in humans and are often responsible for product recalls. The normal flora of the gut normally contains the harmless strains and often provide K2 to the body. They are not always...

Enterococcus faecalis
2011-04-15 14:36:05

Enterococcus faecalis "“ formerly classified as part of the Group D Streptococcus system "“ is a Gram-positive, commensal bacterium inhabiting the gastrointestinal tracts of humans and other mammals. It is one of the main constituents of some probiotic food supplements. E. faecalis can cause life-threatening infections in humans. It is frequently found in root canal-treated teeth in...

Word of the Day
tessitura
  • The prevailing range of a vocal or instrumental part, within which most of the tones lie.
This word is Italian in origin and comes from the Latin 'textura,' web, structure.