Download e-book for iPad: Andrology: Male Reproductive Health and Dysfunction by E. Nieschlag (auth.), Prof. Dr. med., FRCP Eberhard

By E. Nieschlag (auth.), Prof. Dr. med., FRCP Eberhard Nieschlag, Prof. Dr. med. Hermann M. Behre (eds.)

ISBN-10: 3662044919

ISBN-13: 9783662044919

ISBN-10: 3662044935

ISBN-13: 9783662044933

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In: Short RV, Balaban E (eds) The differences between the sexes. Cambridge University Press, Cambridge, pp 419-431 Gallardo MH, Bickham GW, Honeycutt RL, Ojeda RA, Köhler N (1999) Karyotyping: a mammal with tetraploidy. Nature 401:341 Gil D, Graves 1, Hazon N, Wells A (1999) Male attractiveness and different testosterone investment in zebra finch eggs. Seience 286:126-128 Goldman AS, Fomina Z, Knights PA, Hill q, Walker AP, Hulten MA (1993) Analysis of the primary sex ratio, sex chromosome aneuploidy and diploidy in human sperm using dualcolour fluorescence in situ hybridisation.

Men's testes are quite small, compared with our ape relatives, while the ejaculates contain a comparatively high number of malformed sperm. There is no visible sign of ovulation in women, and intercourse does not happen exdusively during the fertile phase of the cyde. On the other hand, humans have two very pronounced secondary sex characteristics, namely large breasts and a large penis. This combination led Potts and Short (1999) to speculate that humans belong to a category of polygamous primates with a special kind of partnership, called "serial monogamy".

The most extreme forms are called r-strategies and K-strategies, respectively. Both terms stern from the formula for the growth of populations: ~~ = r. N where dN/dt is the growth rate of the population, expressed as new individuals (dN) per time unit (dt), often expressed as per cent growth rate. It is a function of two variables, the reproduction rate rand a variable K, representing the maximum capacity of the environment for individuals of the particular species. If K is unlimited, the term K-N T=I, is equal to 1, thus the growth of the population is merely a function of the present size (N) and the reproduction rate r, which means a pure, exponential growth rate.

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Andrology: Male Reproductive Health and Dysfunction by E. Nieschlag (auth.), Prof. Dr. med., FRCP Eberhard Nieschlag, Prof. Dr. med. Hermann M. Behre (eds.)

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