Introduction to Human Nutrition

166 Introduction to Human Nutrition basal conditions. However, as discussed below, homo- cysteine metabolism is more affected by ...

The Vitamins 167 Doses of 50–200 mg of vitamin B 6 /day have an antiemetic effect, and the vitamin is widely used, alone or in c ...

168 Introduction to Human Nutrition of bacterial contamination of the lakes where the algae were harvested. Absorption and metab ...

The Vitamins 169 Vitamin B 12 is absorbed from the distal third of the ileum. There are intrinsic factor–vitamin B 12 binding si ...

170 Introduction to Human Nutrition Assessment of vitamin B 12 status Measurement of plasma concentrations of vitamin B 12 is th ...

The Vitamins 171 Tetrahydrofolate can carry one-carbon fragments attached to N-5 (formyl, formimino, or methyl groups), N-10 (fo ...

172 Introduction to Human Nutrition and choline. Serine is the most important source of substituted folates for biosynthetic rea ...

The Vitamins 173 administration of methotrexate to inhibit tumor growth, and folate (normally as 5-formyl-tetrahydro- folate, le ...

174 Introduction to Human Nutrition this is the only way in which methyl-tetrahydrofolate can be demethylated to yield free fola ...

The Vitamins 175 methylation of CpG islands in DNA, and there is evidence that some cancers (and especially colorectal cancer) a ...

176 Introduction to Human Nutrition much of the [^3 H]-thymidine after incubation with dUMP as they do without preincubation. Ei ...

The Vitamins 177 both free and bound to a serum glycoprotein that has biotinidase activity, catalyzing the hydrolysis of biocyti ...

178 Introduction to Human Nutrition Glucose metabolism in biotin defi ciency Biotin is the coenzyme for one of the key enzymes o ...

The Vitamins 179 other fatty acyl) moieties in a variety of biosynthetic and catabolic reactions, including: ● cholesterol and s ...

180 Introduction to Human Nutrition ● decreased serum cholesterol and decreased urinary excretion of 17-ketosteroids, refl ectin ...

The Vitamins 181 they are cut, as a result of the release of ascorbate oxidase from the plant tissue. Signifi cant losses of the ...

182 Introduction to Human Nutrition substrate is linked to decarboxylation of 2- oxoglutarate. Many of these enzymes are involve ...

The Vitamins 183 becomes rarefi ed, so that the bones fracture with minimal trauma. The name scurvy is derived from the Italian ...

184 Introduction to Human Nutrition An intake of 40 mg/day is more than adequate to maintain a total body content of 900 mg of v ...

The Vitamins 185 therefore require signifi cantly more than 100 mg of vitamin C/day. Inhibition of nitrosamine formation The saf ...