Metabolism of nitrogenous compounds by ruminant liver

Article Abstract:

Ruminants take in considerable amounts of nitrogen in the form of ammonia, which is absorbed and converted to urea in the liver. Rising nitrogen intake causes an increase in both ammonia and urea production. This is associated with an increase in the liver clearance of amino acids. The cause of this association is undetermined, but the utilization of aspartate or glutamate in ureagenesis and its connection to other liver functions are implicated. Amino acids are also potential sources of carbon for glucose synthesis, therefore, gluconeogenesis may also contribute to the amino acid clearance rate of the liver.

Research, Organic compounds, Gluconeogenesis, Nitrogen metabolism

---

Cytochrome b5/cytochrome b5 reductase complex in rat liver microsomes has NADH-linked aquacobalamin reductase activity

Article Abstract:

Rat liver microsomal NADH-linked aquacobalamin reductase was characterized to elucidate its possible physiological role. Elution profiles of the solubilized enzyme showed that NADH-linked aquacobalamin reductase activity is derived from the cytochrome b5/cytochrome b5 reductase complex. This finding was further confirmed by enzyme activity and inhibition experiments. These results demonstrate that a microsomal electron transfer protein also mediates the synthesis of cobalamin coenzymes.

Identification and classification, Oxidoreductases, Vitamin B12, Microsomes

---

Comparative metabolism of phylloquinone and menaquinone-9 in rat liver

Article Abstract:

Vitamin K requirement can be satisfied either by phylloquinone or manaquinones (MK), obtained from plants and intestinal microflora, respectively. The turnover of phylloquinone and MK-9 in rat liver was determined and their efficiencies in satisfying vitamin K requirement were assessed. The results showed that the turnover of MK-9 is much slower than that of phylloquinones. In addition, phylloquinones have a generally higher biological activity than MK-9.

Vitamin K

Similar abstracts:

• Abstracts: The effects of dairy products on body composition, bone mineralization, and weight loss in adolescent girls. Role of calcium in bone health during childhood
• Abstracts: Type of dietary carbohydrate affects thyroid hormone deiodination in iron-deficient rats. Potential of diet therapy on murine AIDS
• Abstracts: Dietary fat type and cholesterol quantity interact to affect cholesterol metabolism in guinea pigs. Modification of plasma and hepatic lipids of guinea pigs by feeding high oleic acid pork compared with regular pork
• Abstracts: Atherogenic diets enhance endotoxin-stimulated interleukin-1 and tumor necrosis factor gene expression in rabbit aortae
• Abstracts: Adrenalectomy attenuates the effect of chemical castration on energy balance in rats. Colonic absorption of menaquinone-4 and menaquinone-9 in rats

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.