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¦]
Ammonia is one of the more common modified forms of nitrogen that plants absorb from the soil. The process by which atmospheric nitrogen is converted into compounds such as ammonia that plants can readily use is known as nitrogen fixation.Just as the term suggests, nitrogen fixation involves the fixing of nitrogen into the soil.mmonia is one of the more common modified forms of nitrogen that plants absorb from the soil. The process by which atmospheric nitrogen is converted into compounds such as ammonia that plants can readily use is known as nitrogen fixation.