[PDF] The Significance Of Zoochromes eBook

Author : A.E. Needham
Publisher : Springer Science & Business Media
Page : 434 pages
File Size : 32,13 MB
Release : 2012-12-06
Category : Science
ISBN : 3642807666

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As the title indicates, the theme of this book is the functions of biochromes in animals. Recent works on zoochromes, such as those of D. L. Fox (1953), H. M. Fox and VEVERS (1960) and VUILLAUME (1969), have been concerned primarily with the chemical nature and the taxonomic distribution of these materials, and although function has been considered where relevant this has not been the centre of interest and certainly not the basis for the arrangement of the subject matter. Functional significance is a profitable focus of interest, since it is the one theme which can make biochromatology a discrete and integral subject, and because it is the main interest in all biological fields. At present chromatology seems to be a particularly schizoid subject since it is clear that in metabolic functions biochromes are acting in a chemical capacity whereas integumental pigments function mainly biophysically, in neurological and behavioural contexts. It is profitable to attempt an integration by studying the functions of as many chromes as possible, from all aspects.

Author : A.C. Neville
Publisher : Springer Science & Business Media
Page : 460 pages
File Size : 47,52 MB
Release : 2012-12-06
Category : Science
ISBN : 3642809103

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Mention the words 'arthropod cuticle' to most biologists and they usually provoke a glazed expression. This is because the cuticle is commonly regarded as an inert substance. It is hoped that this book will dispel this fallacy. The study of cuticle in its proper context now involves many of the wider aspects of biology which are currently in vogue (e. g. how a hormone like ecdyson induces a specific enzyme like dopa decarboxylase; the unsolved major problem of cell gradient and polarity; the involvement of cyclic AMP in hormonal mechanisms; the extra cellular control of cuticular enzymes, of the mechanical proper ties of cuticle structural proteins, and of the orientation of fibrous molecules; and the relation of chromosome puffing to the synthesis of specific proteins). Studies on cuticle demand a variety of techniques, and examples of the following are illustrated in this book (fluorescence, phase contrast, polariza tion and Nomarski interference microscopy; infrared absorp tion; transmission and scanning electron microscopy; autora diography analyzed by electron microscopy; negative staining in the electron microscope; optical diffraction, high angle X-ray diffraction, low angle X -ray diffraction and selected area electron diffraction). I am well aware that the biophysical parts of this book are less incomplete than other aspects. A developmental biologist or a biochemist would have further elaborated other parts ofthe subject matter. Only one previous author, RICHARDS (1951)hasdevoted a book to arthropod cuticle.

Author : Walter Leuthold
Publisher : Springer Science & Business Media
Page : 312 pages
File Size : 20,59 MB
Release : 2012-12-06
Category : Science
ISBN : 364281073X

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This book has been written mostly within sight of wild African ungulates, at the research center in Tsavo East National Park, V oi, Kenya. While this had many positive aspects, there were also a few drawbacks. The main one of these is the fact that Voi is not exactly at the hub of scientific activity, even if we restrict ourselves to African ungulates. Thus, whereas I had felt initially that I was sufficiently familiar with ethological work on these animals to write a useful review, it soon became woefully evident that this assumption was erroneous. Over the last few years studies on African ungulates have pro liferated and results are being published in journals almost all over the world. My location in East Africa was sometimes less than ideal with respect to access to the most recent literature, and I depended to a considerable extent on the goodwill of colleagues in giving or lending me relevant papers. I am happy to report that I received a great deal of support and cooperation in this respect. Nevertheless, I may have over looked some important papers inadvertently; their authors should not feel slighted by such omissions, which only reflect availability of literature to me. Readers may also notice a considerable geographical bias in favor of East Africa, at the expense of other African regions, particularly South Africa.

Author : A.D. Hasler
Publisher : Springer Science & Business Media
Page : 152 pages
File Size : 14,79 MB
Release : 2012-12-06
Category : Science
ISBN : 3642820700

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Chance Favors Only the Prepared Mind How does a scientist go about the task of pushing back the curtains of the unknown? Certainly the romance of tackling the mysteries of nature provides the motivation, for who would not be inspired by the remarkable life history of this romantic beast, the salmon. After living in the Pacific Ocean for several years, salmon swim thousands of kilometers back to the stream of their birth to spawn. I have always been fascinated by the homing migration of salmon. Noone who has seen a 20-kilogram salmon fling itself into the air repeatedly until it is exhausted in a vain effort to surmount a waterfall can fail to marvel at the strength of the instinct that draws the salmon upriver to the stream where it was born. But how does it find its way back? I was puzzling over this problem during a family vacation in 1946. Inspired by the work of the great German Nobel Laureates, Karl von Frisch and Konrad Lorenz, I had been conducting research with my graduate student Theodore Walker, since 1945, on the ability of fishes to discriminate odors emanating from aquatic plants. Von Frisch had studied schooling minnows and discovered that, if broken, their skin emitted a con specific chemical substance, termed Schreckstoff, which caused other members of its school to disperse and hide.

Author : E. B. Edney
Publisher : Springer Science & Business Media
Page : 295 pages
File Size : 34,46 MB
Release : 2012-12-06
Category : Science
ISBN : 3642811051

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Writers on arthropod water relationships range from bio physicists and biochemists to population ecologists-a fact that gives cause to wonder whether the field is already too heterogeneous to be written about in a single book by a single author. I have partly avoided the problem by concentrating largely on physiological mechanisms and by omitting most aspects of behavioural regulation and most aspects of heat balance and body temperature, except when these impinge directly on water balance. Even within this limited field there has been a lot of work during the past twenty years, as a result of which some problems have been solved (or at least more clearly defined), and many others have been opened up. On the whole there has been a welcome change to a more rigorous experimental approach and it is now possible for water balance people to state their problems in physiological terms. Good progress has been made towards understanding the mechanisms involved in nearly all avenues of water uptake and loss, although problems indeed remain. The cuticle has yielded part of its secrets to electron micrography, but ex ploration by means oflipid biochemistry among other techniques is necessary for a real understanding of cuticle permeability.

Author : Wolfgang Wieser
Publisher : Springer Science & Business Media
Page : 295 pages
File Size : 39,31 MB
Release : 2012-12-06
Category : Science
ISBN : 3642657036

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The study of thermoregulation in endotherms has contributed much to the emergence of the concept of control theory in biology. By the same token, the study of tempera ture adjustment in ectotherms is likely to have a far-reaching influence on ideas on the regulation of metabolism in general. The reason for this is that ectotherms, in adapting to the vagaries of a thermally unstable environment, deploy a range of subtle molecular and organismic strategies. Thus the experimenter, using temperature changes as a tool, is well equipped to analyze some of these strategies. This approach has enabled some important mechanisms of temperature-induced adaptation to be elucidated; the most striking of these are the effects on metabolism of changes in the conformation of enzymes and the transfer properties of membranes. Furthermore, there is a vague but persistent feeling among those working in this field that changes in the nervous system will ultimately prove to be the agency by which many of the molecular mechanisms of temperature adaptation are controlled. Should this indeed be the case, a new phase would soon begin in our understanding of the interactions between the systemic and the cellular levels of organization. However, it is not only questions about the causes of temperature adaptation that can provide answers of potential importance to the general biologist; of equal significance are questions as to the meaning of temperature adaptation in a particular organism.

Author : National Library of Medicine (U.S.)
Publisher :
Page : 1242 pages
File Size : 42,72 MB
Release : 1974
Category : Medicine
ISBN :

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First multi-year cumulation covers six years: 1965-70.

Author : G.P. Moretti
Publisher : Springer Science & Business Media
Page : 470 pages
File Size : 41,49 MB
Release : 2012-12-06
Category : Science
ISBN : 9400986416

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G.P. MORETTI The Triennial Symposium of Trichoptera would seem to have become a regular event on the calendar. Initiated by Prof. Malicky at Lunz in Austria in 1974, they continued at Reading in England in 1977 (Convenor: Dr M.I. Crichton), the last, this year, took place in Perugia, Italy (Convenor: Prof. G.P. Moretti) and the next will be hosted by Dr J.C. Morse in Clemson, U.S.A. in 1983. The most outstanding points of the 3rd International Symposium on Trichoptera held at Perugia from July 28 to August 2, 1980 were I) the high number of participants; 2) the extent, scientific interest and coverage of the papers presented and 3) the warmth and immediate contact which drew everyone together from the first moment. Twenty-one nations (Australia, Austria, Belgium, Bulgaria, Canada, Czechoslavakia, Denmark, France, Germany-F.G.R., Germany-G.D.R., Hungary, Iceland, Italy, Mexico, Netherlands, Poland, Spain, Sweden, Switzerland, United Kingdom, United States) were represented by a total of 63 trichopterologists who presented 54 papers and 8 posters during in 8 sessions chaired by M.I. Crichton, H. Malicky, A. Nielsen, O. Flint, L.