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nitrate uptakenitrate must enter the cells before undergoing assimilatory reduction by the joint action of nitrate reductase and nitrite reductase
measurement of nitrogenase activitythere are various methods to find out whether an organism is a n2-fixer or not if an organism can grow in normal
genetics of nitrogen-fixationthe genetics of nitrogen-fixation is known in detail in klebsiella pneumoniae there are twenty genes required in
leghaemoglobin - factors influencing functions of nitrogenaseleghaemoglobin is a joint product of rhizobium and the host it is produced during the
conformational protection - azotobacterin conformational protection a fe-s redox protein provides protection to the enzyme the protein gets oxidised
respiratory protection - azotobacterin respiratory protection n2-fixing cells adjust the rate of aerobic respiration according to prevailing oxygen
azotobacterazotobacter is known to possess the following two mechanisms to protect its nitrogenase from oxygen inhibition respiratory protection and
oxygen - factors influencing functions of nitrogenaseoxygen is a strong inhibitor of n2-fixation because it blocks both the synthesis as well as the
molecular hydrogenn2-fixing organisms also produce a membrane bound enzyme called uptake-hydrogenase under n2-fixing condition the physiological
molybdenum and vanadium - inorganic nitrogen and sulphur metabolismmolybdenum must be available in nature in order to meet the demand of mo for the
categories of gifted speciesthis group of nitrogen fixers has been divided into three categoriesrhizobium which includes fast growing
biological nitrogen-fixationthe process by which molecular nitrogen n2 is reduced to ammonia nh3 is called nitrogen-fixation n2-fixation this is the
inorganic nitrogen and sulphur metabolismproductivity in agriculture forestry and other ecosystems is basically limited by the availability of
protoplasmic streaming and tubular peristaltic flow modelthe first of the above two models involves the well known phenomenon of cytoplasmic
advantage and disadvantages of fensom and ner electroosmotic flow hypothesisthe model has several advantages over munchs model the presence of p-
mechanism of phloem transportthe efficiency and magnitude of translocation of food material are evident from the annual yields of various crops and
types of transport process in sieve tubesthe metabolites of all the mesophyll cells around the sieve elements join in a common pool to load via the
categories of phloem transportessentially the phloem transport can be subdivided into the following the loading of the organic nutrients from the
necessity of transport in phloemleaves produce photoassimilates and support various tissues including roots the excess photoassimilates and
transport in phloemthe basic necessities of plants water are taken up by the roots another purpose served by the roots is to absorb water soluble
photosynthesisphotosynthesis - the process by which plants utilise energy from sunlight to convert carbon dioxide and water for the synthesis of
cobalt co - micronutrientsthe co concentration in the dry matter of plants grown in soil normally lies around 002 to 05 ppm in soils the content
chlorine cl - micronutrientsthe role of cl- in plant is not clearly understood cl- is required in hill reaction the water splitting reaction of
molybdenum momo is absorbed as molybdate moo2-4 ion by plants its uptake can be competitively reduced by so2-4 the requirement of plants for mo is
zinc zn - micronutrientsin its function in some enzyme systems zn2 resembles mn2 in that it brings about substrate binding and conformational changes