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Q: conditions needed for the growth of micro-organisms
A: Growth Requirements/conditions for Microorganisms are chemical and physical requirements. Chemical requirements. [ In order to grow successfully, microorganisms must have a supply of water as well as numerous other substances including mineral elements, growth factors, and gas, such as oxygen. Virtually all chemical substances in microorganisms contain carbon in some form, whether they be
proteins, fats, carbohydrates, or lipids. Perhaps 50 percent of a bacterium's dry weight is carbon. Carbon can be obtained from organic materials in the environment, or it may be derived from carbon dioxide. Both chemoautotrophic and photoautotrophic microorganisms obtain their energy and produce their nutrients from simple inorganic compounds such as carbon dioxide. Chemoautotrophs do so through chemical reactions, while photoautotrophs use photosynthesis.Physical requirements. Certain physical conditions affect the type and amount of microbial growth. For example, enzyme activity depends on the temperature of the environment, and microorganisms are classified in three groups according to their temperature preferences: psychrophilic organisms (psychrophiles) prefer cold temperatures of about 0?C to 20?C; mesophilic organisms (mesophiles) prefer temperatures at 20?C to 40?C; thermophilic organisms (thermophiles) prefer temperatures higher than 40?C (Figure 1 ). A minimum and a maximum growth temperature range exist for each species. The temperature at which best growth occurs is the optimum growth temperature. ]
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User: identify poor practices that may lead to the spread of infection

User: conditions needed for the growth of micro-organisms

Weegy: Growth Requirements/conditions for Microorganisms are chemical and physical requirements. Chemical requirements. [ In order to grow successfully, microorganisms must have a supply of water as well as numerous other substances including mineral elements, growth factors, and gas, such as oxygen. Virtually all chemical substances in microorganisms contain carbon in some form, whether they be proteins, fats, carbohydrates, or lipids. Perhaps 50 percent of a bacterium's dry weight is carbon. Carbon can be obtained from organic materials in the environment, or it may be derived from carbon dioxide. Both chemoautotrophic and photoautotrophic microorganisms obtain their energy and produce their nutrients from simple inorganic compounds such as carbon dioxide. Chemoautotrophs do so through chemical reactions, while photoautotrophs use photosynthesis.Physical requirements. Certain physical conditions affect the type and amount of microbial growth. For example, enzyme activity depends on the temperature of the environment, and microorganisms are classified in three groups according to their temperature preferences: psychrophilic organisms (psychrophiles) prefer cold temperatures of about 0?C to 20?C; mesophilic organisms (mesophiles) prefer temperatures at 20?C to 40?C; thermophilic organisms (thermophiles) prefer temperatures higher than 40?C (Figure 1 ). A minimum and a maximum growth temperature range exist for each species. The temperature at which best growth occurs is the optimum growth temperature. ]
ephraimzRN|Points 2002|

User: explain the ways an infective agent might enter the body

Weegy: They can enter the body in various ways. Mouth, nose, skin, ear, eyes, etc. Any entry way for bacteria is an entry way for disease- causing agents. [ Hand contact with someone who has those agents can cause one to Once contact occurs, disease-causing agents, such as viruses and bacteria, may enter a person through breaks in the skin, or they may be inhaled or swallowed. Others may enter the body through the moist linings of the eyes, ears, nose, mouth, or other body openings. source: WikiAnswers ]
sharpies|Points 7288|

User: common sources of infection

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Asked 4/5/2012 5:05:32 AM
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