Factors that influence the growth of microorganisms. Bacterial Growth & Genetics Flashcards 2019-02-18

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Influence of environmental factors on microorganisms

factors that influence the growth of microorganisms

A balanced diet should include all essential nutrients like carbs, protein, fats, vitamins and minerals. Halobacterium, a halophilic archaebacterium, inhabits Dead Sea a salt lake situated between Israel and Jordan and the lowest lake in the world , the Great Salt Lake in Utah and other aquatic habitats possessing salt concentrations approaching salt water. Amino acids, purines, and pyrimidines should also be available. Some Archaea with an optimum T of 80 degrees or higher and a maximum T as high as 115 degrees, are now referred to as extreme thermophiles or hyperthermophiles. Most microorganisms fall within this category. Chemical factors Some chemicals can have a harmful effect on microorganisms.

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Factors Affecting the Growth of Microorganisms in Food

factors that influence the growth of microorganisms

Their optimum growth temperature is between 25C and 45C. On the other hand, high grade intelligence is associated with acceleration, quick learning and excellent performance. Cofactors usually function as electron donors or electron acceptors during enzyme reactions. Shine Some microorganisms need light for normal development, but for most of them it is disastrous. Water is necessary for all metabolic processes of microorganisms, for normal osmotic pressure in the microbial cell, to maintain its viability. When bacteria grow, they increase in numbers not in size.

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Growth Requirements for Microorganisms

factors that influence the growth of microorganisms

Solutes and Water Acidity Water is one of the most essential requirements for life. Temperature range: 20°C to 45°C. Have optimal and maximal growth temperatures above 15 and 20°C, respectively. Microaerophiles therefore require oxygen typically 2-10% O2 for growth. The term psychrophile was first used by S. Genes, diet, environmental factors all affect human growth and development.

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Influence of environmental factors on microorganisms

factors that influence the growth of microorganisms

Microbial growth and activities are strongly affected by the pH of the medium. Elements Present In addition to water, microorganisms usually require the presence of certain elements in the air--gases that they absorb to produce needed nutrients. They obtain their energy through aerobic respiration if oxygen is present, but use fermentation or anaerobic respiration if it is absent. Thus, water always diffuses from a region of its higher concentration to a region of the lower concentration. For example thermophilic bacteria will grow best if the temperature is greater than 104 degrees Fahrenheit. However, the egg will rapidly regain its original size and shape when it is transferred to a beaker of pure water. Example: Thiobacillus ferrooxidans, Picrophilus oshimae.

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Factors Affecting the Growth of Microorganisms in Food

factors that influence the growth of microorganisms

Authoritative parenting style makes the child responsible, encourages autonomy and independe … nce. Physical and chemical factors that influence microbial growth Mesophiles Mesophiles are bacteria that grow best at moderate temperatures. Organisms that can grow at relatively high salt concentration up to 10% are said to be osmotolerant. Some bacteria, such as Staphylococcus aureus and Listeria monocytogenes can grow on refrigerated food and cause food-borne illness. Iron Part of certain enzymes.


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Growth of Microorganisms: 6 Factors

factors that influence the growth of microorganisms

Each bacterium cell is self-sufficient and so is able to live independently. Nitrogen, which is used to synthesize proteins, can be taken from the surrounding atmosphere or from other organic matter. Microbes will therefore better when they are in their optimum environment. Low levels of these radiations may cause mutations and may indirectly result in death whereas high levels may directly cause death of the microbes. Some are beneficial, such as those used to make fermented dairy and meat products.

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Factors Affecting the Growth of Microorganisms in Food

factors that influence the growth of microorganisms

The maximum growth temperature of psychrophiles is around 20°C. Halobacterium, a halophilic archaebacterium, inhabits Dead Sea a salt lake situated between Israel and Jordan and the lowest lake in the world , the Great Salt Lake in Utah and other aquatic habitats possessing salt concentrations approaching salt water. Other photosynthetic bacteria the green sulfur bacteria and purple sulfur bacteria carry out an anoxygenic process, using sulfur, sulfur compounds or hydrogen gas to reduce carbon dioxide and form organic compounds. Milk is sterilized by ultra high temperature treatment at temperatures above 130 ° C for a few seconds, which allows you to preserve all the beneficial properties of milk. For practical purposes, there are three categories of anaerobe: Obligate anaerobes, which are harmed by the presence of oxygen.


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Food Safety Education

factors that influence the growth of microorganisms

When micro-organisms are inoculated in a medium originally adjusted to a given pH, it is very likely that this pH will change, depending upon the type of the microbial activity and the composition of the medium. The rate at which bacteria grow is different for each type or organism and is affected by many factors. Oxygen is used by aerobic bacteria during the process of cellular respiration as a final electron acceptor. Poor moisture in … filtration and percolation. Microorganisms are similar to more complex organisms in that they need a variety of materials from their environment to function and accomplish two primary goals--supply enough energy to manage their processes and extract building blocks to repair themselves or procreate. Combining their nutritional patterns, all organisms in nature can be placed into one of four separate groups: photoautotrophs, photoheterotrophs, chemoautotrophs, and chemoheterotrophs.

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