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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: Agrobacteria, Antibiotic, Antibiotic, Antibacterial, Bacilli, Bacillus subtilis, Bacterium, Bacterial, Bacterial, Bacterium, Bioremediation, C. albicans, Cell suspension, Clostridium, Culture media, E. coli, E. coli, E. coli, E. coli, E. coli, Enterobacter, Fermentation, Yeast, Gram negative, Haemophilus, Lactobacilli, Bacterium, Bacterial, Bacterium, Neisseria, Penicillin, Proteus, Pseudomonas, Saccharomyces cerevisiae, Saccharomyces cerevisiae, Salmonella typhimurium, Bacteremia, S. aureus, Staphylococci, Streptococcus, Thermophilic, Xanthomonas Algae are plant-like microorganisms that preceded plants in developing photosynthesis, the ability to turn sunlight into energy. Algae cells contain light-absorbing chloroplasts and produce oxygen through photosynthesis. Although plants generally get the credit for producing the oxygen we breathe, some 75% or more of the oxygen in the planet’s atmosphere is actually produced by photosynthetic algae and cyanobacteria. As microscopes improved over the years, scientists began noticing striking similarities in the appearances of mitochondria, chloroplasts, and bacterial cells. They discovered that these two organelles contain their own DNA, or gene set, organized very much like the DNA in bacterial cells. Mitochondria and chloroplasts also reproduce independently from the cells in which they reside, in a manner very like bacterial fission.
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