By G. Pethes

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Despite this maternal placental blood flow may show large variations [15, 19]. Ihis is an important fact in interpreting studies on the experimental reduction of fetal growth and will be discussed later. Most studies have concentrated on their regulation of fetal growth by nutrient supply to the fetus and on the inherent control by the fetus through the modulation of its endocrine state. Nutrient supply to the fetus Large changes in maternal nutritional state can be elicited by a restriction of food intake, but gross effects on fetal growth are not seen until the reduction of food intake is severe and sustained [20-22] and may not be seen in man [23].

2) :— — metabolic energy input goes from a positive number when the muscle shortens, to zero when length is unchanged, to a negative value when it is stretched. Under optimal conditions vertebrate striated muscles can be quite efficient machines. As a general rule they are able to convert about 25% of the chemical energy stored in carbohydrates, lipids or proteins into mechanical work. Muscle physiologists often report much higher efficiencies of 50-75% in experi­ ments using isolated muscles.

2_, 319. 45. Kyle, F. C. (1963) Ann. Int. Med. 59 Suppl. 3, 1. 46. Van Assche, F. , Aerts, L. and Verjaus, M. (1977) Brit. J. Obstet. Gynec. 84, 751. 47. Picon, L. (1967) Endocrinol. 81, 1419. 48. Susa, J. , McCormick, K. , Widness, J. , Singer, D. , Adamson, K. and Schwartz, R. (1979) Diabetes 28, 1058. 59 49. D'Ercole, A. , Foushee, D. B. and Underwood, L. E. (1976) J. Clin. Endocrinol. Metab. 43, 1069. 50. Gluckman, P. D. and Brinsmead, M. W. (1976) J. Clin Endo. Metab. 43, 1378. 51. , Hall, K.

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Advances in Animal and Comparative Physiology. Advances in by G. Pethes
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