Atlantic walruses inhabit coastal areas from northeastern Canada to Greenland, while Pacific walruses inhabit the northern seas off Russia and Alaska, migrating seasonally from their southern range in the Bering Seaâwhere they are found on the pack ice in winterâto the Chukchi Sea.alruses use their iconic long tusks for a variety of reasons, each of which makes their lives in the Arctic a bit easier. They use them to haul their enormous bodies out of frigid waters, thus their tooth-walking label, and to break breathing holes into ice from below.
The sulphurous Î±-amino acid L-methionine is an essential amino acid. The human body is not able to manufacture it by itself. That means that a constant blood serum level level therefore has to be maintained through nutrition and diet. The main functions of L-methionine include the building of various protein molecules and the synthesis of the equally sulphurous amino acid L-cysteine.
The synthesis of methionine from homocysteine is catalyzed by methionine synthase, an enzyme that not only folate (as 5-methyltetrahydrofolate) but also vitamin B12. Thus, folate (and/or vitamin B 12) deficiency can result in decreased synthesis of methionine and an accumulation of homocysteine.he only function of folate coenzymes in the body appears to be in mediating the transfer of one-carbon units (2) . Folate coenzymes act as acceptors and donors of one-carbon units in a variety of reactions critical to the metabolism of nucleic acids and amino acids (Figure 2) (3) .