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Bacteria are both harmful and useful to the environment, humans, and animals. The role of bacteria in disease and infection is important. Some bacteria act as pathogens and cause tetanus, typhoid fever, pneumonia, syphilis, cholera, foodborne illness and tuberculosis. Sepsis, a systemic infectious syndrome characterized by shock and massive vasodilation, or localized infection, can be caused by bacteria such as streptococcus, staphylococcus, or many gram-negative bacteria. Some bacterial infections can spread throughout the host's body and become systemic. Top-fermenting yeasts (so-called because they float to the top of the beer) can produce higher alcohol concentrations and prefer higher temperatures. An example is Saccharomyces cerevisiae, known to brewers as ale yeast. They produce fruitier, sweeter, real ale type beers. Bottom-fermenting yeasts ferment more sugars leaving a crisper taste and work well at low temperatures. An example is Saccharomyces uvarum, formerly known as Saccharomyces carlsbergensis. They are used in producing lager-type beers. Brewers of wheat beers often use varieties of Torulaspora delbrueckii. Click on following items to see more information: Antimicrobial, Antibiotics, Antibiotic treatment, Bactericidal, Bacillus, Microorganisms, Microorganism, Microorganisms, Phage, Biodegradation, Campylobacter, Cell cultures, Cholera, Corynebacterium, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Erythromycin, Flavobacterium, Yeasts, Growth media, Klebsiella, Meningococcus, Bacteriological, Micrococci, Multidrug resistant, Pasteurella, Prokaryotes, Pseudomonas aeruginosa, S. cerevisiae, S. cerevisiae, Salmonella, Salmonella typhimurium, Shigella, Staphylococcus aureus, Streptococcal, Streptococcal, Vibriosis, Yeasts Beijerinck discovered that by adding or removing certain compounds from the medium or incubating under different conditions, it was possible to favor the growth of certain microbes and prevent the growth of others. An example is Beijerinck's work with nitrogen-fixing bacteria, which are important in agriculture and the global cycling of nitrogen. They are capable of taking nitrogen gas (N2) from the air and reducing it to ammonia (NH3). This is an important property since reduced nitrogen compounds such as ammonia are the only compounds most organisms, including agriculturally important plants, are able to use as a nitrogen source. Biotechnology in one form or another has flourished since prehistoric times. When the first human beings realized that they could plant their own crops and breed their own animals, they learned to use biotechnology. The discovery that fruit juices fermented into wine, or that milk could be converted into cheese or yogurt, or that beer could be made by fermenting solutions of malt and hops began the study of biotechnology. When the first bakers found that they could make a soft, spongy bread rather than a firm, thin cracker, they were acting as fledgling biotechnologists. The first animal breeders, realizing that different physical traits could be either magnified or lost by mating appropriate pairs of animals, engaged in the manipulations of biotechnology.
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