Oxygen requirements for bacterial growth: Aerobic: require O 2 for growth. An organism that can grow under either aerobic or anaerobic conditions is a facultative anaerobe. In tube A, all the growth is seen at the top of the tube. The growth of bacteria with varying oxygen requirements in thioglycolate tubes is illustrated in Figure 9.29. The many requirements for successful growth include those both chemical and physical. temperature; and oxygen requirements that will sustain growth for the bacterial pathogens that are ... Because the nature of bacterial growth is logarithmic, linear interpolation using the The nutrients means the organic and inorganic material obtained from environment for the Bacterial Growth and multiplication. An organism whose growth cannot occur in the presence of oxygen is anaerobic. In tube A, all the growth is seen at the top of the tube. Tube B looks like the opposite of tube A. Bacteria grow at the bottom of tube B. Microaerophilic organisms require free oxygen but at a very limited concentration. They may be: Obligate aerobes—which can grow only in the presence of oxygen (e.g., P. aeruginosa). In tube A, all the growth is seen at the top of the tube. Over time, oxygen slowly diffuses throughout the thioglycolate tube culture from the top. The bacteria are obligate (strict) aerobe s that cannot grow without an abundant supply of oxygen. Facultative anaerobe A facultative anaerobe is a microorganism that can grow with or without oxygen but usually grows faster (produces more ATP) in its presence. 9.2 Oxygen Requirements for Microbial Growth Bacterial density increases in the area where oxygen concentration is best suited for the growth of that particular organism. Oxygen requirements of different bacteria Almost all plants and animals are dependent upon supply of atmospheric oxygen which is unlikely in bacteria. Depending upon the oxygen need in bacteria, they are classified into 4 groups: strict or obligate aerobic that grow only in the presence of oxygen. The bacteria need the nutrition and optimum physical environment to conduct its molecular, physiological activity and to multiply. Obligate Anaerobes: killed by O 2 Oxygen requirements are determined by enzyme systems which may or may not be adapted to handle oxygen toxicity. Oxygen requirements of bacteria reflect the mechanism used by them, to satisfy their energy needs. 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. Aerobic bacteria: They require oxygen for their growth. Tube B looks like the opposite of tube A. Bacteria grow at the bottom of tube B. Tube B looks like the opposite of tube A. Bacteria grow at the bottom of tube B. The growth of bacteria with varying oxygen requirements in thioglycolate tubes is illustrated in Figure 9.20. An obligate aerobe is a bacterium that requires atmospheric levels of oxygen for normal growth. Chemical requirements. The growth of bacteria with varying oxygen requirements in thioglycolate tubes is illustrated in . The growth of bacteria with varying oxygen requirements in thioglycolate tubes is illustrated in Figure 2. The bacteria are obligate (strict) aerobe s that cannot grow without an abundant supply of oxygen. An organism that requires oxygen for growth is called aerobic. 9.2 Oxygen Requirements for Microbial Growth. Bacteria on the basis of their oxygen requirements can be classified broadly into aerobic and anaerobic bacteria. The bacteria are obligate (strict) aerobes that cannot grow without an abundant supply of oxygen. Anaerobic: O 2 not required, often toxic Facultative Anaerobes: may grow both ways but prefer O 2. The nutrients are categorized into two – major and minor nutrients. On the basis of oxygen requirements, bacteria can be divided into following different categories: Aerobes : Aerobes grow in ambient air, which contains 21% oxygen and small amount of (0.03%) of carbon dioxide.
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