Molecular hydrogen, Biology

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.

Posted Date: 1/17/2013 5:00:06 AM | Location : United States







Related Discussions:- Molecular hydrogen, Assignment Help, Ask Question on Molecular hydrogen, Get Answer, Expert's Help, Molecular hydrogen Discussions

Write discussion on Molecular hydrogen
Your posts are moderated
Related Questions
Embrylogical Devlopment of Hypospadias The development of the penis and scrotum is intluenced by the testes. In the absence of the testes, the female structures of the

green gland is excretory organ of which orthopodic phylem

Q. Concerning their permeability how are membranes classified? Membranes can be classified as permeable, impermeable, selectively permeable or semipermeable. An impermeable

Which of the following best describes the reasons why the sliding clamp is able to confer processivity on DNA polymerase and not DNA primase? A. The sliding clamp coats the tem

Define Hormonal Responses to Injury?  A number of hormonal changes take place in patients following injury. There is a marked rise in the counter regulatory hormones, viz., glu

Dicotyledons (2,00,000 species) The dicot's are of diverse nature. The leaves are net veined, stem contains ring of vascular bundles, cambium tissue is present so secondary

Proteins Protease inhibitors: Protease inhibitors are protein-based substances widely distributed within the plant kingdom, including the seeds of most cultivated legumes wh

name a disorder of human blood that is caused by mutation

Define Planning for nutritional need For Adults? The term 'adult' refers to any individual in the age group of twenty years and above. The period beginning from twenty years an

What is the life cycle type of bryophytes? As in all plants the life cycle of bryophytes is diplobiontic (alternation of generations). In bryophytes the lasting form is the hap