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¦]
Non-biological natural nitrogen fixation. Nitrogen can be fixed by lightning converting nitrogen and oxygen into NOx (nitrogen oxides), if there is oxygen in the air. NOx may react with water to make nitric acid, which may end up in the soil, where it makes nitrate, which is of use to growing plants.