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

Define measuring body composition - underwater weighing, Define Techniques ...

Define Techniques for Measuring Body Composition - Underwater weighing? Underwater weighing (densitometry): It applies the Archimedean principle of water displacement by the fu

Prevention of infection in icu unit, Prevention of Infection 1. Stri...

Prevention of Infection 1. Strict asepsis practiced in ICU.  2. All the invasive lines are covered with sterile-drape.  3. Antibiotics-broad-spectrum ones are adm

Phylum protoazoa, what is the respiratory organ of phylum protozoa?

what is the respiratory organ of phylum protozoa?

Is a gene the same as a dna molecule, Q. Is a gene the same as a DNA molecu...

Q. Is a gene the same as a DNA molecule? Genes are units of heredity. A gene is a section or segment of a DNA molecule. This section of DNA provides a genetic code for synthesi

Sporophytic incompatibility, Sporophytic Incompatibility The recogniti...

Sporophytic Incompatibility The recognition and rejection reactions in a SSI system occur on the stigma surface, placing barriers for pollen germination or penetration of poll

What are the aerobic and anaerobic exercises, Aerobic and Anaerobic Exercis...

Aerobic and Anaerobic Exercises Generally, there are two types of exercises: - Aerobic - Anaerobic Aerobic exercises are those in which the patient spends calories fro

Invasion or migration - ecology, Invasion or Migration - Ecology When ...

Invasion or Migration - Ecology When a habitat is changed it can be a potential site for the establishment of many organisms. Many species actually invade or reach this new si

Open heart surgery, OPEN HEART SURGERY : When patient is connected lo ca...

OPEN HEART SURGERY : When patient is connected lo cardio pulmonary bypass for an operative procedure, it is considered to be open-heart operation. In a routine coronary artery b

Dietary considerations oesophagitis, Q. Dietary considerations oesophagitis...

Q. Dietary considerations oesophagitis? The dietary considerations for this condition are the same as in oesophag it is. The patient should be recommended to: • eat smaller

Define consistency and texture - dysphilgia, Define Consistency and Texture...

Define Consistency and Texture - Dysphilgia? Aspiration of liquids, including water, into the lungs can result in complications. To avoid this problem and yet fulfilling the fl

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