L-Ornithine is a non-proteinogenic recycled component of the Urea Cycle leading to the production of arginine. L-ornithine is the starting compound for polyamine biosynthesis via ornithine decarboxylase.
The urea cycle is the final pathway for removal of surplus nitrogen from the body, and the major route in humans for detoxification of ammonia. The full complement of enzymes is expressed only in liver. Inherited deficiencies of urea cycle
Frontiers in bioscience (Landmark edition), 16, 1331-1343 (2011-01-05)
Colon epithelium is renewed within few days through asymmetric mitosis of pluripotent cells followed by differentiation and exfoliation. Absorptive colonocytes do not transport amino acids from lumen to bloodstream but import amino acids from plasma. Among amino acids, colonocytes can
British journal of pharmacology, 158(3), 638-651 (2009-09-22)
The enzyme arginase metabolizes L-arginine to L-ornithine and urea. Besides its fundamental role in the hepatic urea cycle, arginase is also expressed the immune system of mice and man. While significant interspecies differences exist regarding expression, subcellular localization and regulation
Applied microbiology and biotechnology, 91(1), 17-30 (2011-05-10)
In Bacteria, the pathways of polyamine biosynthesis start with the amino acids L-lysine, L-ornithine, L-arginine, or L-aspartic acid. Some of these polyamines are of special interest due to their use in the production of engineering plastics (e.g., polyamides) or as
Critical reviews in immunology, 32(6), 463-488 (2013-02-23)
The purpose of immunology is simple. Cure or prevent disease. M1/M2 is useful because it is simple. M1/M2 describes the two major and opposing activities of macrophages. M1 activity inhibits cell proliferation and causes tissue damage while M2 activity promotes
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