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

Angiosperms, why are the microspores in groups of four?

why are the microspores in groups of four?

What is meant by substrates of enzymatic reactions, Substrates are reagent ...

Substrates are reagent molecules upon which enzymes act. The enzyme has spatial binding sites for the attachment of its substrate. These sites are known as activation centers of

Recurrent type, Recurrent Type In this type, euspory (seen in normal ...

Recurrent Type In this type, euspory (seen in normal cases) is replaced by aneuspory (Diplospory) because of irregular meiosis. When the spore mother ceIl functions directly

Gene interactions (post mendelian genetics), GENE INTERACTIONS (POST MENDEL...

GENE INTERACTIONS (POST MENDELIAN GENETICS) Phenotypic expression of a gene may be altered by the influence of other genes. The modification of the normal phenotype of certain

Giant nerve fibres, Giant Nerve Fibres We now know that giant nerve f...

Giant Nerve Fibres We now know that giant nerve fibres take place in the central nervous system of many polychaetes, oligochaetes, insects cephalopod etc. They are broader an

Parasitology, how trematodes/nematodes adapt to their parasitic mode of fee...

how trematodes/nematodes adapt to their parasitic mode of feeding

Describe about the tertiary prevention - food allergy, Describe about the T...

Describe about the Tertiary Prevention - food allergy? The tertiary allergy prevention, as you already know, focus on patients with symptoms. Hence, the strategies will target

Compound leaf, Compound leaf is the leaf in which the blade forms small le...

Compound leaf is the leaf in which the blade forms small leaflets. Compound leaves which have several small leaflets originating from the central axis are termed as pinnately comp

What are the nucleic acids, Q. What are the nucleic acids? What is the hist...

Q. What are the nucleic acids? What is the historic origin of this name? RNA and DNA, the nucleic acids, are the molecules responsible for the hereditary information that comma

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