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Microbiology Reference Libraries

Page 5 of about 145 Articles
Corynebacterium diphtheriae
2011-04-15 14:19:47

Corynebacterium diphtheriae is a pathogenic bacterium that causes diphtheria. It was discovered in 1884. There are four subspecies C. diphtheriae mitis, C. diphtheriae intermedius, C. diphtheriae gravis, and C. diphtheriae belfanti. They all are a little bit different in their colonial morphology and biochemical properties such as the ability to metabolize certain nutrients. The diphtheria...

Clostridium tetani
2011-04-15 14:14:43

Clostridium tetani is a rod-shaped, anaerobic bacterium of the genus Clostridium. It's a gram-positive and resembles tennis rackets or drumsticks on a gram stain. It can be found as spores in soil and the gastrointestinal tract of animals. It produces a potent biological toxin which is the causative agent of tetanus. Ancient people recognized the relationship between wounds and fatal muscle...

Clostridium perfringens
2011-04-15 14:02:16

Clostridium perfringens (formerly known as C. welchii) is a Gram-positive, rod-shaped, anaerobic, spore-forming bacterium of the genus Clostridium. It is always present in nature and is a normal component of decaying vegetation, marine sediment, the intestinal tract of humans, other vertebrates, insects, and soil. It can be a human pathogen and also harmlessly ingested. Commonly it is...

Clostridium difficile
2011-04-15 13:50:01

Clostridium difficile, also known as "CDF/cdf", or "C. diff", is a Gram-positive bacteria of the genus Clostridium that causes severe diarrhea and other intestinal disease when competing bacteria in the gut flora are wiped out by antibiotics. They are anaerobic, spore-forming rods and is the most serious cause of antibiotic-associated diarrhea and potentially to pseudomembranous colitis. C....

Clostridium botulinum
2011-04-15 13:32:47

Clostridium botulinum is a gram-positive, rod-shaped bacterium that produces neurotoxins, known as botulinum neurotoxins types A-G, that cause the flaccid muscular paralysis seen in botulism. It is the main paralytic agent in botox and is commonly found in soil. It is also an obligate anaerobe, meaning oxygen is poisonous to the cells. Superoxide dismutase helps C. botulinum tolerate traces...

Chlamydophila psittaci
2011-04-15 13:07:05

Chlamydophila psittaci is a lethal intracellular bacterial species that causes endemic avian chlamydiosis, epizootic outbreaks in mammals, and respiratory psittacosis in humans. It can be transmitted through inhalation, contact, or ingestions among birds and mammals. It generally starts with flu-like symptoms and becomes a life-threatening pneumonia. Many stay dormant until activated by stress....

Campylobacter jejuni
2011-04-14 16:27:41

Campylobacter jejuni is a species of curved, helical shaped, non-spore forming, Gram-negative microaerophilic, bacteria commonly found in animal feces. It is one of the most common causes of human gastroenteritis in the world. This food poisoning can be severely debilitating but rarely life-threatening. It has also been linked to Guillain-Barre syndrome which generally develops two to three...

Campylobacter fetus
2011-04-14 16:18:37

Campylobacter fetus is a species of Gram-negative, motile bacteria with characteristic "S-shaped" rod morphology similar to members of the genus Vibrio. It is oxidase-positive like other members of the Campylobacter genus. C. fetus can cause abortion in cattle and sheep as well as being an opportunistic human pathogen and can cause bacteremia and thrombophlebitis. It is rare but it can lead...

Burkholderia pseudomallei
2011-04-14 16:11:25

Burkholderia pseudomallei is a Gram-negative, bipolar, aerobic, motile rod-shaped bacterium. It causes the disease melioidosis in humans and animals and is also capable of infecting plants. The bacteria can from in a number of artificial environments. Optimal temperature is around 40°C in pH-neutral or slightly acidic environments. Most strains can ferment sugars without gas formation. The...

Burkholderia mallei
2011-04-14 16:00:01

Burkholderia mallei is a gram-negative bipolar aerobic bacterium. The human and animal pathogen causes Glanders. The Latin name of this disease gave name to the causative agent species. It is related to B. pseudomallei although the bacterium is nonmotile. The bacterium can be eliminated through numerous disinfectants including benzalkonium chloride, iodine, mercuric chloride, potassium...

Word of the Day
humgruffin
  • A terrible or repulsive person.
Regarding the etymology of 'humgruffin,' the OED says (rather unhelpfully) that it's a 'made-up word.' We might guess that 'hum' comes from 'humbug' or possibly 'hum' meaning 'a disagreeable smell,' while 'gruffin' could be a combination of 'gruff' and 'griffin.'