Aerotolerant anaerobes, Biology

Assignment Help:

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.


Related Discussions:- Aerotolerant anaerobes

Molecular mechanism of hormone action, MOLECULAR MECHANISM OF HORMONE ACTIO...

MOLECULAR MECHANISM OF HORMONE ACTION - Once a hormone enters the bloodstream it can reach almost any cell in the body. However, each hormone affects only certain kinds of c

Mechanism of movements, Normal 0 false false false EN-I...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Extracellular signals, extracellular signals and their characteristics

extracellular signals and their characteristics

Ecology, importance of pyramid of energy to the ecologist

importance of pyramid of energy to the ecologist

What is an effect of increased temperature, What is the effect of increased...

What is the effect of increased temperature on a non enzyme catalyzed reaction? What are the effects of increased temperature on an enzyme catalyzed reaction?

Dimensions of the cells, On a given microscope, the numerical aperture of t...

On a given microscope, the numerical aperture of the objective is 1.5. The microscope is provided with a filter that selects a wavelength of 500 nm. What is the limit of resolution

What is the significance of rhynchocoel, What is the significance of Rhynch...

What is the significance of Rhynchocoel? The unique body cavity of the Nemertean worms, which comprise the retractable proboscis. There is some debate on whether this is a true

Eggs of insect, EGG S OF INSECT This eggs is centrolecithal and it is ...

EGG S OF INSECT This eggs is centrolecithal and it is elliptical. It diameter is 2-3 mm. It has two eggs membrane i.e. vitelline membrane and chitinous capsule. The chit

Explain the composition of blood agar, Explain the Composition of Blood Aga...

Explain the Composition of Blood Agar? Infusion from beef heart - 500 gm Tryptose - 10.0 gm Sodium Chloride -  5.0 gm Agar - 15 gm Distilled water - 1000  ml pH

Define mineral requirements during pregnancy period - iron, Define Mineral ...

Define Mineral Requirements during pregnancy period - Iron? While B 12 and folk acid are needed for the normal erythropoiesis, they must be accompanied by adequate amounts of

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd