J a troelstra (59 risultati)

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Paperback or Softback. Condizione: New. Metabolic Processes in the Foetus and Newborn Infant: Rotterdam 22-24 October 1970. Book.

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Paperback or Softback. Condizione: New. Therapeutic Aspects of Nutrition: Groningen 9-11 May 1973. Book.

Paperback or Softback. Condizione: New. Aspects of Praematurity and Dysmaturity: Groningen 10-12 May 1967. Book.

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Paperback or Softback. Condizione: New. Constructivism in Mathematics, 121: An Introduction. Book.

Condizione: Gebraucht / Used. 1968. Or.cloth with damaged d.j. 356pp. 8°. Index.

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Condizione: New. pp. 332 Index.

Paperback. Condizione: Brand New. 332 pages. 9.02x5.98x0.75 inches. In Stock.

Condizione: New. pp. 388 Indexes.

Paperback. Condizione: Brand New. reprint edition. 378 pages. 9.01x5.98x0.90 inches. In Stock.

Paperback. Condizione: Brand New. 388 pages. 9.02x5.98x0.88 inches. In Stock.

Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - The concept of the foeto-placental unit as an integrated endocrine organ has been defined recently by many in vivo studies at the 17th- 20th week of gestation. A functioning foeto-placental unit is necessary for most of the increased oestrogen production of pregnancy and for the provision of glucocorticoids and aldosterone to the foetus. Neither the foetus nor the placenta alone have the necessary enzyme systems for the synthesis of these groups of steroids. However, when the foetus and placenta function as a unit, all of the enzyme systems are present for the synthesis of these steroids from circulating cholesterol. The placenta, but not the mid-gestation foetal adrenal, can synthesize physiologically significant amounts of pregnenolone from circulating cholesterol. Part of the pregnenolone is converted to progesterone in the placenta by the 3~-HSD system (absent in the foetus). The progesterone is transferred to the foetus where it is transformed by C-II, C-17, C-18 and C-21 hydroxylases (all absent in the placenta) to cortisol, corticosterone and aldosterone. Pregnenolone transferred from the placenta to the foetus undergoes 171X-hydroxylation, side chain splitting and sulfurylation (absent in the placenta) and is converted to DHAS. The DHAS may undergo 161X-hydroxylation (absent in the placenta) in the foetal liver and be transported to the placenta as 161X-OH-DHAS. There it is subjected to a neutral steroid sulfatase (absent in the foetus) and is converted to oestriol by action of the 3~-HSD system and the aromatizing enzyme system.…

Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - Session I The Development of Enzyme Systems in the Mammal.- Development of enzyme systems in glycolysis.- Computer representation of fetal and adult glycolysis.- The development of some enzymes of amino acid metabolism in the human liver.- Control and interference by endogenous and exogenous substances on normal liver development.- Effects of hormones on the development of enzyme systems.- Drug susceptibility and the development of erythrocyte enzyme systems.- Discussion.- Session II Aminoacid Metabolism.- Placental transport of free amino-acids.- The plasma aminogram in ¿small for date¿ newborn infants.- The protein and amino-acid requirements of the premature infant.- Protein requirement of normal infants between 8 and 56 days of age.- Protein status of ¿small for date¿ animals.- Infantile malnutrition: its production and effects.- Discussion.- Session III Carbohydrate-Fat Metabolism.- The development of insulin secretion in man.- The development of glucagon secretion.- Functional development in brown adipose tissue.- The development of carbohydrate tolerance.- Effect of undernutrition on intestinal active transport of sugar and aminoacids.- Metabolism of carbohydrates and fat components in the premature and full-term newborn after infusions of triglycerides and glycerol.- Carbohydrate metabolism in the newborn rat.- Discussion.- Index of authors.- Index of subjects.…