|
|
|
|
|
|
Bacteria are minute, with physical dimensions typically in the range of 0.5 to 5.0 micrometers. Because of this, they are not visible without a microscope. Exceptions are known, the largest reported bacteria, the size of a full stop (period), were isolated in the gut of a fish in the early 1990s. Antony van Leeuwenhoek was the first to report viewing bacteria, which he did in 1683 with the aid of a single-lens microscope of his own design. Salmonella typhi is a type of Salmonella bacteria. It causes the disease typhoid fever. The organism can be transmitted by the fecal-oral route -- it is excreted by humans in feces and may be transmitted by contaminated water, food, or by person to person contact (with inadequate attention to personal hygiene). In the developed world, Salmonella are readily removed/inactivated by drinking water treatment and by wastewater treatment. Click on following items to see more information: Agrobacterium, Antibiotics, Antibiotics, Antimicrobial, Bacillus, Bacillus subtilis, Bacteria, Microbial, Bacteriological, Bacteroides, Botulin, Candida albicans, Cell suspensions, Clostridia, Culture medium, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Enterobacters, Fermentations, Yeasts, Gram negative, Haemophilus, Lactococci, Bacteria, Microbial, Microorganism, Neisseria, Petri dish, Pseudomonas, Pseudomonas, S. cerevisiae, S. cerevisiae, Salmonella typhimurium, Sepsis, Staphylococcus aureus, Streptococcal, Streptococci, Thermophiles, Yeasts The Proteobacteria are a major group of bacteria. They include a wide variety of pathogens, such as Escherichia, Salmonella, Vibrio, Helicobacter, and many other notable genera. Others are free-living, and include many of the bacteria responsible for nitrogen fixation. The group is defined mainly in terms of ribosomal RNA sequences, and is named for the Greek god Proteus, who could change his shape, because of the great diversity of forms found in it. All Proteobacteria are Gram-negative, with an outer membrane mainly composed of liposaccharides. Many move about using flagella, but some are non-motile or rely on bacterial gliding. The last include the myxobacteria, a unique group of bacteria that can aggregate to form multicellular fruiting bodies. There is also a wide variety in the types of metabolism. Most members are anaerobic and heterotrophic, but there are numerous exceptions. P. aeruginosa usually causes problems to humans who have already have had their immune systems weakened. This bacteria usually infects the urinary tract, burns, wounds, and also causes other blood infections. One in ten hospital acquired infections is from Pseudomonas. Cystic fibrosis patients are also predisposed to aeruginosa infection of the lungs.
|
© 2005
Transgalactic Ltd (manufacturer of Bioscreen C software) |
Privacy Statement | P.O. Box
1393, 00101 Helsinki, Finland,
Last modified: May 25, 2005
| ||||||
