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Author : H Breucker
Publisher :
ISBN 13 : 9783642684616
Total Pages : 108 pages
Book Rating : 4.6/5 (846 download)
Download or read book Seasonal Spermatogenesis in the Mute Swan (Cygnus Olor) written by H Breucker and published by . This book was released on 1982-03-01 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. Breucker
Publisher : Springer Science & Business Media
ISBN 13 : 3642684602
Total Pages : 103 pages
Book Rating : 4.6/5 (426 download)
Download or read book Seasonal Spermatogenesis in the Mute Swan (Cygnus olor) written by H. Breucker and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of all the classes in the animal kingdom, birds represent the best known. There are in total about 8600 living species, and the systematic study of this class is more or less complete. Extensive observations - to a large extent by amateur ornithologists - with respect to geographical distribution, life cycles, demands on and adaptations to the environment, breeding habits, migration, and so forth have contributed towards basic and more widely relevant knowledge, e. g. , in the areas of ethology, ecology, and evo lution and also in social biology (Hilprecht 1970; Farner and King 1971). Together, all these aspects are affected by the reproductive biology of birds, and studies have therefore been carried out for many years with special emphasis on this subject. How ever, until now this emphasis in avian reproductive biology has been physiological and in particular endocrinological (Murton and Westwood 1977; Roosen-Runge 1977). The morphology of the gonads has been treated in far less detail, and has been confined to a comparatively small number of species, compared with other classes of vertebrates. Reproduction is the section in the life cycle of an animal which is most dependent upon environmental conditions. Reproduction therefore usually takes place at a par ticular time, when stress for the adult animals is at its lowest and the chances of sur vival for the newborn are at their highest, i. e.
Author : Haide Breuker
Publisher : Springer Verlag
ISBN 13 : 9780387113265
Total Pages : 94 pages
Book Rating : 4.1/5 (132 download)
Download or read book Seasonal Spermatogenesis in the Mute Swan (Cygnus Olor) written by Haide Breuker and published by Springer Verlag. This book was released on 1982-01-01 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard Johnston
Publisher : Springer Science & Business Media
ISBN 13 : 1461567874
Total Pages : 432 pages
Book Rating : 4.4/5 (615 download)
Download or read book Current Ornithology written by Richard Johnston and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 5 of this series continues its coverage of currently active re search fields in ornithology. Because an editor can never be a disin terested observer of his or her own editorial efforts, any claim for su periority of this volume is not without conflict of interest. Even so, Volume 5 has certain merits that even a parent should acknowledge, and I find the current chapters not merely timely and authoritative but compelling in their demand for a reader's attention. Wolfgang and Roswitha Wiltschko provide a perceptive review of magnetic orientation in birds, a piece dedicated to Fritz Merkel, the pioneer in studies of magnetic orientation. Sergei Kharitonov and Doug las Siegel-Causey are concerned with the behavioral ecology of seabird coloniality, emphasizing their field experiences in the USSR and the United States. Ted Miller examines the application of studies of bird behavior to comparative biology, pursuing the interface of behavior and evolutionary biology adumbrated by Konrad Lorenz in the 1930s. Jeremy Raynor gives us a summary of the work over the past decade on bird flight, which is not, by turns, as complex or as simple as we had formerly believed. Carrol Henderson describes recent develop ments in nongame bird conservation, based on his pioneering work in the State of Minnesota. Alan Kamil discusses optimal experimental design for research in ornithology, a field in which experimental work is frequently difficult to pursue.
Author :
Publisher :
ISBN 13 :
Total Pages : 1094 pages
Book Rating : 4.:/5 (31 download)
Download or read book Wildlife Review written by and published by . This book was released on 1982 with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Library of Medicine (U.S.)
Publisher :
ISBN 13 :
Total Pages : 988 pages
Book Rating : 4.F/5 ( download)
Download or read book National Library of Medicine Current Catalog written by National Library of Medicine (U.S.) and published by . This book was released on with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher : U of Minnesota Press
ISBN 13 : 9781452900162
Total Pages : 812 pages
Book Rating : 4.9/5 (1 download)
Download or read book The Ecology and Management of Breeding Waterfowl written by and published by U of Minnesota Press. This book was released on 1992 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. Kugler
Publisher : Springer Science & Business Media
ISBN 13 : 3642685528
Total Pages : 95 pages
Book Rating : 4.6/5 (426 download)
Download or read book On Angiotensin-Degrading Aminopeptidases in the Rat Kidney written by P. Kugler and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: The octapeptide angiotensin II (ANG II, Fig. 1) is the key effector substance of the renin-angiotensin system (RAS) (Werning 1972, Page and Bumpus 1974, Hierholzer 1977, Vecsei et al. 1978, Johnson and Anderson 1980 lit.). ANG II is formed in two enzymatic steps. Renin acts on renin substrate, a glycoprotein, to produce angiotensin I (ANG I, a decapeptide), which in turn is acted upon by converting enzyme to form ANG II (Skeggs et al. 1968, Fig. 1). Renin substrate (angiotensinogen) is produced mainly in the liver (Page et al. 1941) and is a constituent of the ~-globulin fraction in the circulating plasma (Plentl et al. 1943). The two enzymes involved in the formation of ANG II from renin substra te are formed at various sites in the body. Renin (E.C. 3. 4. 99. 19) is produced mainly in the granular epithelioid cells of the kidney (Cook 1971, Taugner et al. 1979, Davi doff and Schiebler 1981), and converting enzyme (CE, E.C. 3. 4. 15. 1) occurs chiefly in the lung (Ng and Vane 1967, Bakhle 1974 lit.) as well as in numerous other tissues, such as the juxtaglomerular apparatus of the kidney (Granger et al. 1969, 1972) and the brush border of the renal proximal tubule (Ward et al. 1975, 1976; Ward und Erdos 1977). The biological effects of ANG II are numerous.
Author : Henning Scheich
Publisher : Springer Science & Business Media
ISBN 13 : 3642691668
Total Pages : 78 pages
Book Rating : 4.6/5 (426 download)
Download or read book Multimodal Torus in the Weakly Electric Fish Eigenmannia written by Henning Scheich and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ever since the behavioral work of Lissrnann (1958), who showed that the weak electric discharges of some families of fish (hitherto considered useless for prey capture or for scaring away enemies) are part of a strange sensory system, these fish have attracted attention from biologists. The subsequent discovery of the electroreceptors in the skin of gymnotids and mormyrids (Bullock et al. 1961; Fessard and Szabo 1961) and the evidence that the ampullae of Lorenzini of nonelectric sharks and rays are also electro receptors (Digkgraaf and Kalmijn 1962) was a start for a lively branch of physiological, anatomical, and behavioral research. Many fmdings of general importance for these fields have made the case to which extremes the performance of the central and peri pheral nervous systems can be driven. Among those fmdings is the temporal accuracy of the pacemaker of some high-frequency fish which controls the electric organ, pro bably the most accurate biological clock (coefficient of variation
Author : V. Grouls
Publisher : Springer Science & Business Media
ISBN 13 : 3642685145
Total Pages : 79 pages
Book Rating : 4.6/5 (426 download)
Download or read book The Development of the Red Pulp in the Spleen written by V. Grouls and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: In many aspects hematopoiesis in newborn rodents, especially in rats, resembles hema topoiesis in the human fetus in the 6th-7th month of gestation. In man the transition from the stage of liver to bone marrow erythropoiesis takes place at this time (Bessis, 1973). In rodents, however, the liver is almost the only place where hematopoiesis occurs until birth. Thereafter it is replaced to a growing extent by the bone marrow, which so far consists mainly of immature mesenchymal cells (Maximow, 1910; Cuda, 1970). Thus hematopoietic precursor cells appear in the sternum only around 30 h after birth. Just as in premature human infants, a macrocytic anemia can be demonstrat ed in normal neonatal rats (Lucarelli et aI., 1964, 1968). Beside liver (fetal) and bone marrow, the spleen is involved in hematopoiesis. In rodents like rats and mice, splenic hematopoiesis persists more or less markedly until adulthood; in man, however, it ceases after birth and reappears only under certain pathological conditions (Fischer et aI., 1970; Hennekeuser et aI., 1967; Fresen, 1960).
Author : G. Grün
Publisher : Springer Science & Business Media
ISBN 13 : 3642687199
Total Pages : 96 pages
Book Rating : 4.6/5 (426 download)
Download or read book The Development of the Vertebrate Retina written by G. Grün and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mature vertebrate retina is a highly complicated array of several kinds of cells, capable of receiving light impulses, transforming them into neuronal membrane currents, and transmitting these in a meaningful way to central processing. Before it starts to develop, it is a small sheet of unconspicuous cells, which do not differ from other cells of the central nervous system. The chain of events which lead to the trans formation from this stage into that of highly specialized cells ready to fulfll a specific task, is usually called "differentiation. " Originally, this word indicated firstly the proc ess of divergence from other cells which were previously alike, and secondly, the change from an earlier stage of the same cello lt has become widespread practice to imply by the word "differentiation" also the acquisition of specific properties and capacities which are characteristic of a mature, Le. , specifically active, cello Every cell is active at any stage of development, but certain activities are shared by most cells (e. g. , the activities of preparing and accomplishing proliferation, that of initiating development, that of maintaining a certain level of metabolism), while there are others which are shared by only a small number of - originally relate- cells. In most cases these latter activities are acquired by the fmal steps of cellular development, the terminal "differentiation. " In the context of the present paper, the word "function" will refer to this latter type of specific activity.
Author : Steven F. Perry
Publisher : Springer Science & Business Media
ISBN 13 : 3642689647
Total Pages : 90 pages
Book Rating : 4.6/5 (426 download)
Download or read book Reptilian Lungs written by Steven F. Perry and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph has attempted to bring together morphological and physiological studies of reptilian lungs, to analyze the nature of the resulting correlations, and to risk some speculations regarding the evolution of reptilian lung structure. Central to this work is the morphometric evaluation of the lungs in two species of lizard: "the teju (Tupinambis nigropunctatus Spix) and the savanna monitor (Varanus exanthema ticus [Bosc]) which is presented here for the first time. These two species are similar in body form, and both are diurnally active predators, but their lungs are of basic ally different structural types. The teju possesses relatively small, single-chambered (unicameral) lungs in which the homeycomb-like (faveolar) parenchyma is more or less evenly distributed along their length. In the monitor the lungs are large and many-chambered (multicameral), the individual chambers connecting to an unbranched, intrapulmonary bronchus. The parenchyma is in the form of shallow cubicles (ediculae), which are elaborated on the intercameral septa. The parenchyma is heterogeneously distributed within the lungs, tending to be most concentrated near the intrapulmonary bronchus and the middle third of the lung length. The ventral and caudal portions of these lungs are thin-walled and highly flexible. In both species those portions of the lungs which are most exposed to air convection possess dense capillary nets which almost completely cover both sides of the parenchymal partitions. In more distal regions of the parenchy ma or of the lung, the intercapillary spaces become larger, creating a pseudo-single capillary net.
Author : National Library of Medicine (U.S.)
Publisher :
ISBN 13 :
Total Pages : 1964 pages
Book Rating : 4.3/5 (91 download)
Download or read book Current Catalog written by National Library of Medicine (U.S.) and published by . This book was released on with total page 1964 pages. Available in PDF, EPUB and Kindle. Book excerpt: First multi-year cumulation covers six years: 1965-70.
Author :
Publisher :
ISBN 13 :
Total Pages : 980 pages
Book Rating : 4.:/5 (31 download)
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1982 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Annals of Zoology written by and published by . This book was released on 1982 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 834 pages
Book Rating : 4.3/5 (91 download)
Download or read book Acta Biologica Hungarica written by and published by . This book was released on 1983 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 498 pages
Book Rating : 4.:/5 (48 download)
Download or read book Anatomy and Embryology written by and published by . This book was released on 1983 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
