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¦]
Ecological Cycles. Nitrogen, Carbon-Oxygen, Phosphorus, Sulfur. The Nitrogen cycle The Nitrogen Cycle Nitrogen is used by living organisms to produce a number of complex organic molecules like amino acids, proteins, and nucleic acids. 78% of the worldâs atmosphere is nitrogen Despite its abundance in the atmosphere, nitrogen is often the most limiting nutrient for plant growth.