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In soil, microorganisms help in the transformation of nitrogen to ammonia with enzymes secreted by these microbes, which reside in the rhizosphere (a zone that includes the root surface and the soil that adheres to the root after gentle shaking). Some bacteria are able to use molecular nitrogen as their source of nitrogen, converting it to nitrogenous compounds, a process known as nitrogen fixation. Many other bacteria are found as symbionts in humans and other organisms. For example, their presence in the large intestine can help prevent the growth of potentially harmful microbes. Candida albicans, a diploid sexual fungus (a form of yeast) is the causal agent of opportunistic infections in humans, the most common being oral and vaginal infections. Systemic fungal infections have emerged as important causes of morbidity and mortality in immunocompromised patients (e.g., AIDS, cancer chemotherapy, organ or bone marrow transplantation). In addition, hospital-related infections in patients not previously considered at risk (e.g. patients on an intensive care unit) have become a cause of major health concern. Click on following items to see more information: Alcaligenes, Antibiotics, Antibiotics, Antimicrobial, Bacillus, Bacillus subtilis, Microorganisms, Bacteriological, Bacteriophage, Bacteroides, Botulin, Candida albicans, Cell suspensions, Clostridia, Culture medium, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Enterobacters, Fermentations, Yeasts, Gram positive, Haemophilus, Listeriosis, Microbial, Microbial, Microorganism, Neisseria, Pichia, Pseudomonas aeruginosa, Ps. putida, S. cerevisiae, S. cerevisiae, Salmonella typhimurium, Serratia, Staphylococcus aureus, Streptococcal, Streptococci, Thermophile, Yeasts Plesiomonas shigelloides is a Gram-negative bacterium which has been isolated from freshwater, freshwater fish, and shellfish and from many types of animals including cattle, goats, swine, cats, dogs, monkeys, vultures, snakes, and toads. It has been associated with causing human disease, but this has not yet been proven. It is placed among the Enterobacteriaceae. Serratia marcescens is a Gram negative bacterium, a human pathogen of the family Enterobacteriaceae. It is involved in nosocomial infections, particularly urinary tract infections and wound infections. Most strains are resistant to several antibiotics because of the presence of R-factors on plasmids. In the 1950s it was erroneously believed to be non-pathogenic and its reddish coloration was used in school experiments to track infections. Because of its red pigmentation, and its ability to grow on bread. Diatoms These algae hardly look like plants, but more like flying saucers, tiny canoes or cigars, lobed leaves, the undersides of mushroom caps, striated ribbons, or filigreed Christmas ornaments. Whatever their shape, all diatoms have shell-like, brittle cell walls made out of silica (glass) and pectin. The walls are two interlocking halves or shells that fit together like a pillbox. Because they depend on sunlight for photosynthesis, diatoms generally live in the upper 200 meters of oceans and bodies of fresh water.
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