what are the physical and chemical requirements for microbial growth?
312943
The physical and chemical requirements for growth can vary widely among different species of bacteria, and some are found in environments as extreme as cold polar regions and hot, acid springs. In general, the physical requirements for bacteria include proper temperature, pH and osmotic pressure.
32868
Warmth – the 'danger zone' temperatures at which bacteria grow best are between 5ºC and 63ºC. Food – like any other living things, germs need food to grow. High-risk foods that bacteria love best include dairy products, meat, poultry, fish and shellfish. Water – bacteria need moisture to grow.
1158437
Fungal and bacterial growth rates had optimum temperatures around 25-30 degrees C, while at higher temperatures lower values were found. This decrease was more drastic for fungi than for bacteria, resulting in an increase in the ratio of bacterial to fungal growth rate at higher temperatures.
212781
['A mesophile is an organism that grows best in moderate temperature, neither too hot nor too cold, typically between 20 and 45 °C (68 and 113 °F). ... ', 'All bacteria have their own optimum environmental surroundings and temperatures in which they thrive the most.']
1361848
Answer: Bacteriological Incubators give explicit temperature which is required for the development of the microorganisms.
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Aerobic bacteria require oxygen for survival. They are present in aerated moist soil containing organic carbon sources. ... The obligate aerobes that compulsorily require oxygen for deriving energy, growth, reproduction, and cellular respiration. These organisms do not survive in the absence of oxygen or flooding.
929205
Nutrients, such as nitrogen (N), phosphorus (P), and carbon (C), are among the 16 chemical elements necessary for growth. Plants, microbes, animals, and organic matter are the biotic locations of nutrients. The atmosphere, water, and soil represent the abiotic locations.
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['reabsorption of water and mineral ions such as sodium and chloride.', 'formation and temporary storage of faeces.', 'maintaining a resident population of over 500 species of bacteria.', 'bacterial fermentation of indigestible materials.']
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Microorganisms are controlled by means of physical agents and chemical agents. Physical agents include such methods of control as high or low temperature, desiccation, osmotic pressure, radiation, and filtration.
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Bacterial cells are placed into a 250mL liquid growth medium in a closed laboratory flask. According to Malthusian theory, they will reproduce exponentially and then: Continue reproducing geometrically until the food supply is used up, then they will cease to grow.
212602
Like all living things, bacteria need food, water and the proper environment to live and grow. ... Most bacteria grow best within certain ranges of temperature, and have specific requirements related to their need for air, the proper amount of water, acid and salt.
1081612
The basic requirements for culture media are: Energy source. Carbon source. Nitrogen source.
1107535
['cellular composition. the cell is considered the basic unit of life as it is the smallest unit that can carry it out functions of life. ... ', 'metabolism. chemicals are substances with unique molecular composition that are used in or produced by chemical processes. ... ', 'growth. ... ', 'excretion. ... ', 'responsiveness. ... ', 'movement. ... ', 'reproduction. ... ', 'growth.']
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Most bacteria grow best within certain ranges of temperature, and have specific requirements related to their need for air, the proper amount of water, acid and salt. By controlling nutrients, water, temperature and time, air, acidity, and salt, you can eliminate, control, or reduce the rate at which bacteria grow.
1133653
['Food, Waste, and Gas Exchange. They need to maintain a workable ratio of surface area to volume to allow an efficient transfer of materials in and out of the cell.', 'Growth. In order for an organism to grow, they must divide so they can get larger.', 'Repair. ... ', 'Reproduction.']
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Microorganisms (or microbes) vary significantly in terms of the source, chemical form, and amount of essential elements they need. Some examples of these essential nutrients are carbon, oxygen, hydrogen, phosphorus, and sulfur. ... Macro-nutrients usually help maintain the cell structure and metabolism.
1009401
The principal environmental requirements for plant growth include adequate space for root and canopy development, sufficient light, water, oxygen, carbon dioxide, and mineral elements, and temperature suitable for essential physiologic processes.