IN 1939, it was suggested by one of us 1 that the amide-nitrogen of glutamine was a source of urea-nitrogen and that urea formation was paralleled by a continuous re-synthesis of glutamine.

The use of blood urea nitrogen (BUN) concentration as a measure of renal function is even less reliable, because BUN levels can be affected by the presence of gastrointestinal bleeding or by the ...

Each nephron is made of a tubule and is responsible for 'cleaning' the blood by removing urea and excess water and mineral ions. Blood passes through the nephron inside the kidneys, there are many ...