Perinatal changes in amino acid metabolism of @entity35 brain, especially @entity493 and XXXX .

@entity1522 @entity26 @entity492 @entity367 @entity35 @entity493 @entity413 @entity2388
The changes in both the levels of some free @entity1522 and their metabolism in the @entity35 brain during the first 24 hr of postnatal life were studied. The content of @entity367 decreased for the first 2 hr; it remained at the lowest level for the next 4 hr, when it began to increase. The content of @entity493 decreased for the first 6 hr and approached the adult level. @entity26 consumption, @entity413 oxidation, and @entity2388 formation in the cerebral slices of the 24-hr-old @entity35 were as much as 150% of that of the 19-day-old fetus. The distribution profile of radioactivity incorporated into the cerebral @entity1522 from the subarachnoid-injected [U-14C]glucose was also changed. In the 2- and 6-hr-old @entity35 , 50% of the total radioactivity recovered in the free @entity1522 was in @entity493 . Its rate decreased to 30% in the 24-hr-old and was 2% in the adult, while the radioactivity incorporated into @entity367 increased. @entity493 aminotransferase activity started to increase at birth and had the highest level at 24 hr after birth. It then decreased and finally reached the same level as shown at birth. However, @entity492 aminotransferase increased during the first 6 hr after birth and did not change until the end of the first day of life.
