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Aerotolerant anaerobes are incapable of aerobic respiration, but can nevertheless grow in the presence of air. Many lactic acid bacteria fall into this category. They can only generate energy by fermentation and lack both catalase and superoxide dismutase, but are able to grow in the presence of oxygen because they have a mechanism for destroying superoxide. Microorganisms affect the Eh of their environment during growth. This is true especially of aerobes, which can lower the Eh of their environment while anaerobes cannot. As aerobes grow, oxygen in the medium is depleted, resulting in the lowering of Eh. Growth is not slowed, however, due to the ability of cells to make use of oxygen donating or hydrogen-accepting substances in the medium. The result of this is that the medium becomes poorer in oxidizing and richer in reducing substances. Microorganisms canreduce the Eh of a medium by their production of certain metabolic by-products such as hydrogen sulphide, which has the capacity to lower Eh to -300 mv.
What is the Mendel's first law? The Mendel's first law postulates that a characteristic (trait) of an individual is always verified by two factors, one inherited from the fathe
Explain in details Class Hirudenia - Leeches? This group includes the leeches. Most leeches grow in tropical freshwater habitats, and are familiar to most people as bloodsucker
Define protein requirements of children up to age of 2 years? Infants and children up to age of 2 years should consume about 40% energy from fat (i.e. 40 en%). Fat is an import
EXAMPLES OF NATURAL SELECTION - 1 . INDUSTRIAL MELANISM - First studied by Fischer & Ford (1845) on pepperd moth (Biston betularia) of two types : grey moth (B.
The non-oxidative phase generates ribose precursors The non-oxidative phase of the pathway, including the following reactions, converts pentose-5-phosphate to other sugars.
What do facilitated diffusion and active transport have in common? What are the differences between them? Facilitated diffusion can be confused with active transport because in
Q. Explain the use of Benzoates acid? Benzoic acid, sodium benzoate and the parahydroxy esters (parabens) are used as preservatives. Benzoic acid and its sodium salt, sodium be
list the major species of echinodermata
what is atp explain in detail?
Q. What are the Physical Signs of mitral stenosis? A typical malar flush is described in mitral stenosis. It is difficult to appreciate in Indians. Pulse is normal or low volum
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