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

Draw a diagram of transverse section of mammalian bone, Draw a diagram of t...

Draw a diagram of transverse section of mammalian bone and label the following parts in it: (i) Haversian canal (ii) Lacuna containing osteocytes (iii) Canaliculi

Define food processing unit operations, Define Food processing unit operati...

Define Food processing unit operations? Food processing unit operations are involved in the engineering aspects of food processing, packaging and storage. Heating, cooling, dry

Long-term treatment of maple syrup urine disease, Q. Long-term treatment of...

Q. Long-term treatment of maple syrup urine disease? Special feeds containing energy and proteins without the branched chain amino acids can be given to the infants. In some in

What is capillarity, What is capillarity? How this phenomenon is chemical...

What is capillarity? How this phenomenon is chemically explained? What is the relevance of capillarity for water transport in plants? Capillarity is the phenomenon by which

Explain the cultural practices of single crop, Explain the Cultural Practic...

Explain the Cultural Practices of single crop Continuous cultivation of a single crop over years on the same site causes accumulation of a particular group of microbes, which d

What are polyclonal antibodies, Antibodies of dissimilar specificities, whi...

Antibodies of dissimilar specificities, which react to the same antigen, are known as polyclonal antibodies.

St-segment in exercise induced pvc, Q. What do you mean by  ST-Segment in ...

Q. What do you mean by  ST-Segment in Exercise Induced  PVC? Ans. Over the years it has been believed that repolarization in ventricular ectopic beats had no diagnostic si

State the active hyperemia, Which of the following is true for active hyper...

Which of the following is true for active hyperemia, a local control mechanism within the circulatory system? A. There will be a decrease in force developed by smooth muscles s

Areas affected in peptic ulcer, Q. Areas affected in peptic ulcer? The ...

Q. Areas affected in peptic ulcer? The areas affected in peptic ulcer (due to erosion) can be: 1. Lower part of the oesophagus. 2, stomach (lesser curvature - an urn, whe

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