Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Symbiotic Nitrogen Fixers - Nutrient Cycles
Of the symbiotic nitrogen fixing bacteria, species of Rhizobium form root nodules in legumes and are the most studied nitrogen fixers and the best understood. Species of Rhizobium are most specific to particular species of legumes. The rhizobia penetrate the root hair and once inside the root, the bacteria rapidly multiply and form swollen, irregular - shaped bodies in roots of legumes. Some non-legume w6ody plants also have root nodules and fix nitrogen symbiotically.
The organisms that cause the formation of nodule and fixation of nitrogen are actinomycetes (a kind of primitive fungus). Some examples of non-legumes are species of Alnus, Elaeagnus Myrica, Araucaria, Ginkgo, and Casuarina. Unlike legumes, which are largely tropical in origin, these nitrogen fixers originate in the temperate zone. Nitrogen fixation by blue green algae or cyanobacteria may take place in free living forms or in symbiosis with fungi as in certain lichens, mosses ferns and at least one seed plant. The fronds of the small free floating aquatic fern Azolla contain small pores filled with symbiotic blue green algae Anabaena that actively fix nitrogen. For centuries this fern has played an important role in the rice fields of China. Before the rice fields are planted the water filled paddy fields are covered with the aquatic fern which fixes enough nitrogen for the crop as it matures. This practice permits rice to be grown without further addition of nitrogen fertilisers. Symbiotic nitrogen fixers are more efficient than free living ones.
Pneumonia: Pneumonia is an inflammation with consolidation of the parenchyma of the lung. It occurs most commonly in infants and young children and may occur as primary dis
Proteins - classification, composition and biological functions Proteins, as you may already know, are made up of carbon, hydrogen, nitrogen, oxygen and usually sulphur. Prot
Risk Characterization Risk Characterization : Integration of hazard identification, hazard characterization and exposure assessment into an estimation of the adverse e
Hydrocarbon (HC): Hydrocarbons such as methane, ethylene, acetylene is present in air. Most of these are low molecular weight gases and liquids at ordinary temperature. Sour
P o x diseases Small-pox in human beings and pox in a few animal species are closely related to each other. It is shown by the fact that the vaccine for the prevention of sma
Carbon paper leaf prints Cover the vein side of a leaf with a very thin layer of lard or vaseline. Place the greased leaf vein side up on various layers of newspaper and cover
All currently available inotropic agents act to increase Ca 2+ for activation in both normal and failing myocardium (Hurst). The use of inotropic agents in the treatment of CHF is
Hybrid sterility can be regarded as yet another form of interspecific sterility. The offspring of the interspecific crosses are mainly sterile. Geological studies have shown that t
Diabetes mellitm This anabolic hormone exerts its action on key glycolytic enzymes thus leading to the conversion of glucose to pyruvate as explained under the regulation
Q What is the usual reproduction cycle of a DNA virus? A usual virus has proteins on its capsid that bind to the outer membrane of the host cell. In the place where the virus a
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd