By for the National Academy of Sciences, Francisco J. Ayala, Walter M. Fitch

ISBN-10: 0309051916

ISBN-13: 9780309051910

Considering that George Gaylord Simpson released pace and Mode in Evolution in 1944, discoveries in paleontology and genetics have abounded. This quantity brings jointly the findings and insights of ultra-modern top specialists within the examine of evolution, together with Francisco J. Ayala, W. Ford Doolittle, and Stephen Jay Gould. It covers morphological and genetic alterations in human populations, contradicting the preferred declare that glossy people descend from a unmarried lady.

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Read e-book online Tempo and Mode in Evolution: Genetics and Paleontology 50 PDF

Seeing that George Gaylord Simpson released pace and Mode in Evolution in 1944, discoveries in paleontology and genetics have abounded. This quantity brings jointly the findings and insights of modern major specialists within the research of evolution, together with Francisco J. Ayala, W. Ford Doolittle, and Stephen Jay Gould.

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Extra info for Tempo and Mode in Evolution: Genetics and Paleontology 50 Years After Simpson

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Chronically affected mice also s h o w e d inactivity, weight loss, r o u g h hair coats, and d y s p n e a . A mortality of 9 5 % was observed over a period of 11 m o n t h s ( N e l s o n , 1937a). In subsequent y e a r s . N e l s o n ( 1 9 5 5 , 1 9 6 3 , 1967a,b) c o n ­ tended that the erratic p n e u m o n i a o b s e r v e d in such cases w a s viral in origin. B e c a u s e of this belief, the p n e u m o n i a w a s first designated endemic pneumonia ( N e l s o n , 1955) and later en­ zootic bronchiectasis ( N e l s o n , 1963).

T h u s , there is a m p l e reason to believe that offspring of infected d a m s most c o m m o n l y acquire the infection by aerosol t r a n s m i s s i o n during the first few d a y s of life ( K l i e n e b e r g e r and N o b e l , 1962; L e m c k e , 1961). T r a n s p l a c e n t a l t r a n s m i s s i o n also a p p e a r s p o s ­ sible ( G a n a w a y et aL, 1973; J u h r et aL, 1970; T r a m et aL, 1970). D a t a c o n c e r n e d with survival of the o r g a n i s m outside the host, as in c o n t a m i n a t e d food and w a t e r , are contradictory (Juhr, 1 9 7 1 ; V o g e l z a n g , 1975).

A l s o , tissues m a y contain a g r o w t h inhibitor (Tully and R a s k - N i e l s e n , 1967), thought to be lysolecithin. Addition of lysophospholipase ( K a k l a m a n i s et aL, 1969; M a r d h and T a y l o r - R o b i n s o n , 1973) or serial dilution of tissue suspensions in broth (Tully and R a s k - N i e l s e n , 1967) abolishes this a n t i - m y c o p l a s m a l activity. M y c o p l a s m a s are m o r e difficult to g r o w on artificial m e d i a than most bacteria. In k e e p i n g with their small g e n o m e s i z e , m y c o p l a s m a s have a limited biosynthetic capacity and there­ fore require a wide array of precursor m o l e c u l e s for m a c r o m o l e c u l a r synthesis (Rodwell and M i t c h e l l , 1979).

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Tempo and Mode in Evolution: Genetics and Paleontology 50 Years After Simpson by for the National Academy of Sciences, Francisco J. Ayala, Walter M. Fitch


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