Jf danielli eds (6 resultados)

Condición: Good. Ex reference library copy, with sticker to front board to that effect. Otherwise VG condition, with little wear and clean and bright contents.

Condición: Fair. Volume 11B. This is an ex-library book and may have the usual library/used-book markings inside.This book has hardback covers. Clean from markings. In fair condition, suitable as a study copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item,800grams, ISBN:0123643724.…

Condición: Fair. Volume 9. This is an ex-library book and may have the usual library/used-book markings inside.This book has hardback covers. Clean from markings. In fair condition, suitable as a study copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item,850grams, ISBN:0123643694.…

Condición: Fine. NY 1972 Academic. Hardcover. Octavo, 353pp., index, cloth. Fine in Fine DJ.

Condición: Very Good. vii, 290 pp; illustrations. Original cloth. Very Good. This copy does NOT have any library markings. First Edition. "Contains the papers read at a Symposium of the Society, which was held at Cambridge in July, 1946." One of the noteworthy papers is W. T. Astbury, "X-Ray Studies of Nucleic Acids" (pp. 66-76, with 2 plates and 1 text figure; see photos). To quote just one passage from this paper: "It seems improbable . . . to judge by the degree of perfection in the X-ray fibre diagram, that these four different kinds of nucleotides are distributed simply at random; rather must they follow one another in some definite order--at least, in more crystalline regions of the structure that give rise to the regular diffraction pattern. It is necessary to make this proviso, because in high-polymeric aggregates there is always the possibility that there are long portions of chains (or columns in this case) of sufficient regularity to build up crystallographically more perfect regions, while at the same time there occurs every so often some chemical peculiarity that might indeed confer specificity on a structure that is otherwise designed to perform some more standard function" (pp. 67-68). Kersten Hall, "William Astbury and the biological significance of nucleic acids, 19381951", Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, Vol. 42, issue 2, June 2011, pp. 119-128.…

Hardcover. Condición: Very Good. No Jacket. 1st Edition. xix, 448 pp; illus. Original cloth. Very Good, without dust jacket. Other contributors include Haldane, Hinshelwood, Sheppard, Medawar, Danielli, et al. 'In his 1953(b) essay, 'Epigenetics and Evolution,' Waddington analysed the shortcomings of the population genetic account of evolution. . . . Waddington (1953b) claimed that the Modern Synthesis failed to work in at least three areas. First, much adaptation appeared to be non-genetic and regulated by the environment, not by the inherited genotype. Second, as Goldschmidt had noted, large groups of animals differ from each other in ways not compatible with local races branching off. Accumulations of small mutations in a local group could not separate amphibians from fish or reptiles from amphibians. Waddington noted that Goldschmidt's own hypotheses were so unconvincing to geneticists that they obscured the cogency of Goldschmidt's arguments for these 'unbridgeable gaps.' Third, Waddington noted the different rates of evolution seen in the paleontological record. Waddington (1953b, p. 190) concluded that "It is by paying further attention to the nature of the evolving animal, rather than to that of the environment, that we seem likely to make the most rapid progress in our understanding of evolution." He claimed that in conventional studies of evolution, the animal is considered either as a genotype (and is studied by geneticists) or as a phenotype (and is studied by taxonomists). What is needed, said Waddington, is an evolutionary study of those processes that get the genotype to the phenotypethe epigenetics of development. . . . Waddington (1953b, p. 191) then launched into a critique of the notion of 'random mutation,' noting that there are developmental constraints placed on what changes are possible. . . . Waddington distinguishes here normalizing selection working on adults and stabilizing selection working during development. . . . Waddington's notions of normalizing and stabilizing selection have become stabilized in our changing concepts of the roles of genes in evolution' (Scott F. Gilbert, 'Diachronic Biology Meets Evo-Devo: C. H. Waddington's Approach to Evolutionary Developmental Biology', American Zoologist, Volume 40, Issue 5, October 2000, pp. 729737).…