Molecular hydrogen, Biology

Assignment Help:

Molecular Hydrogen

N2-fixing organisms also produce a membrane bound enzyme called uptake-hydrogenase under N2-fixing condition. The physiological significance of the presence of uptake hydrogenase lies in its ability to consume hydrogen produced during nitrogenase activity through aerobic electron transport chain generating ATP in the process. Such nitrogenase uptake-hydrogenase relationship in nitrogen fixing cells provides the following advantages:

  1. By aerobic respiration it restores a major part of energy in the form of ATP
  2. It offers protection of nitrogenase from oxygen.
  3. It prevents inhibitory effect of H2 on nitrogenase activity.

It has been observed that the nitrogenase enzyme catalyses exclusive production of hydrogen provided the N2-fixer is in an atmosphere devoid of nitrogen. Efforts are being made to exploit this special property of the enzyme for photo production of H2 by heterocysts of cyanobacteria on a commercial scale. This would require construction of special strains of cyanobacteria that would be genetically deficient in uptake hydrogenase enzyme. It. is expected that these strains would continuously generate hydrogen in photosynthetic and N2-fixing condition.


Related Discussions:- Molecular hydrogen

Explain methodology required for osazone test, Explain Methodology Required...

Explain Methodology Required for Osazone Test? Take about 250-300 mg of phenylhydrazine mixture in the 3 clean labelled 15 ml dry test tubes. Add 5 ml of the glucose, fructose

Explain adverse effects of adefovir dipivoxil, Adverse Effects of Adefovir ...

Adverse Effects of Adefovir dipivoxil  Doses of adefovir used for HBV are generally well tolerated but may be associated with asthenia, headache, diarrhea and abdominal pain. H

Excreatory organ, what is the excreatory organ of silverfish?

what is the excreatory organ of silverfish?

Why hydrogen bonds are so important, Even though hydrogen bonds are conside...

Even though hydrogen bonds are considered weak chemical bonds, why they are so important, give an example.

Lactose intolerance - modification of carbohydrate intake, Define Lactose i...

Define Lactose intolerance - Modification of carbohydrate intake? This has been covered under the section on digestion and absorption earlier. We learnt that in case of lactose

Describe mitochondria and explain why it would happen, Describe what would ...

Describe what would happen if people lost all of their mitochondria and explain why it would happen.

Adaptations in skeleton for upright posture, ADA PTATIONS IN SKELETON FOR ...

ADA PTATIONS IN SKELETON FOR UPRIGHT POSTURE - 1.      Foramen magnum is directed downward so that the head may rest vertically on the vertebral column. 2.      Four curves

Define about the mid-day meal programme, Define about the Mid-day Meal Prog...

Define about the Mid-day Meal Programme? The National Programme of Nutritional Support to Primary Education commonly known as the Mid Day Meal (MDM) Scheme (was launched in Aug

Show the impressions at first - Transitional Restorations, Q. Show the Impr...

Q. Show the Impressions at first - Transitional Restorations? The dental technique will have modified the abutment to the desired shape and will now be able to fabricate the tr

Discuss briefly the color reactions of proteins, Question 1 List variou...

Question 1 List various methods used for determination of blood glucose. Explain the principle of each test. Add a note on advantages and disadvantages of each method Qu

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