Avascular necrosis (AVN) of the hip is an abnormal and possibly crippling condition in which blood cannot get to the hip bone. When the blood supply to the bone is blocked, the area without blood supply can die. This may lead to collapse of the bone requiring replacement with an artificial hip joint.
Nitrogen Fixing Trees for Permaculture Flowers of the leguminous tree, Kowhai, the national flower of New Zealand Nitrogen fixation is a pattern of nutrient cycling which has successfully been used in perennial agriculture for millennia. This article focuses on legumes, which are nitrogen fixers [â¦]
nitrogen fixation. The process by which free nitrogen from the air is combined with other elements to form organic compounds that plants can use as nutrients. Cyanobacteria and certain other forms of bacteria, especially those that live in the roots of legumes, convert gaseous nitrogen into organic compounds.. The conversion of atmospheric nitrogen into compounds, such as ammonia, by natural agencies or various industrial processes. 2. The conversion by certain soil microorganisms, such as rhizobia, of atmospheric nitrogen into compounds that plants and other organisms can assimilate.