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Microorganisms are found everywhere in nature, owing to the existence of extremophiles, microorganisms that have adapted to generally hostile environments. Extremophiles may be found in environments such as the poles, deserts, geysers, just beneath the surface of rocks, and the bottom of the deep sea. Some are known to survive prolonged time in vacuum, or to be unusually resistant to radiation. Salmonella enterica is a species of Salmonella bacterium. S. enterica has a number of varieties or serovars. Serovar Typhi (sometimes elevated to species status as S. typhi) is the disease agent in typhus. Other serovars such as Typhimurium (also known as S. typhimurium) can lead to a form of human gastroenteritis sometimes referred to as salmonellosis. Most cases of salmonellosis are caused by food infected with S. enterica, which often infects cattle, though also other animals such as domestic cats. However, investigations of vacuum cleaner bags have shown that households can act as a reservoir of the bacterium; this is more likely if the household has contact with an infection source, for example through members working with cattle or in a veterinary clinic. Click on following items to see more information: Activated sludge, Antimicrobial, Antibiotics, Antimicrobial, Bacillus, Bacillus subtilis, Microorganisms, Microorganism, Microbial, Bacteria, Biological reactors, Candida albicans, Cell cultures, Clostridia, Cryptococci, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Edwardsiella, Eubacter, Yeasts, Gram negative, Haemophilus, Lactobacillus, Minimum inhibiting concentration, Bacteriological, Microorganisms, Multidrug resistant, Penicillin, Proteus, Pseudomonas, S. cerevisiae, S. cerevisiae, Salmonella, Schizosaccharomyces, Staphylococcus, Staphylococcus, Streptococci, Thermophile, Wastewater Like bacteria, archaea lack a true nucleus. Both bacteria and archaea usually have one DNA molecule suspended in the cell's cytoplasm contained within a cell membrane. Most, but not all, have a tough, rigid outer cell wall. Although many archaea have tough outer cell walls, these walls contain different kinds of amino acids and sugars than those found in bacteria. Archaeal cell membranes also are chemically distinct from bacterial membranes with differing lipid structures and chemical links. This means that drugs that slow or kill bacteria by interfering with their ability to produce certain key proteins have no effect on archaea. Ciliates are among the most complex of all single-celled creatures, with a diverse array of structures and organelles that perform a range of activities, from finding and catching food, digesting it, excreting it, moving about, respiring, sensing environmental conditions, and balancing the fluids inside their cells. A few ciliates can grow up to 2 millimeters in length, big enough to be seen without a microscope.
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