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Author:
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ISBN:
Category : Amphibians
Languages : en
Pages : 398
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Book Description
Author:
Publisher:
ISBN:
Category : Amphibians
Languages : en
Pages : 398
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Book Description
Author:
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ISBN:
Category : Wildlife conservation
Languages : en
Pages : 1266
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Book Description
Author:
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Category : Biology
Languages : en
Pages : 768
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Book Description
Author: Daniel Escoriza
Publisher: Academic Press
ISBN: 0128158352
Category : Science
Languages : en
Pages : 351
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Book Description
Amphibians of North Africa is a comprehensive compilation of available data on the amphibians and reptiles found in various ecosystems across North West Africa and parts of the Mediterranean region. It is essential to identifying and understanding the ecological role of regional herpetofauna and its conservational importance. It examines the biological origins and diversity of amphibians in North Africa, along with their diverse ecosystems, including deserts, grasslands and subtropical forests. The book features detailed descriptions of the adult and larvae stages of species, such as the North African fire salamander, the common painted frog, Brongersma's toad and the Mediterranean tree frog. This book is a vital resource for herpetology and ecology students and researchers, helping them identify, understand and conserve these amphibians and reptiles in their various habitats across the North African and Mediterranean regions. - Presents the only book on research and species recognition of North West African and Mediterranean amphibians and reptiles in all life phases - Provides novel, iconographic material about little-known species - Features helpful visuals, including ink-drawings, photographs of adult and larvae stages, habitat photographs and distributional maps
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Category : Animal sounds
Languages : en
Pages : 400
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Book Description
Author: W. Arber
Publisher: Springer Science & Business Media
ISBN: 3642655319
Category : Medical
Languages : en
Pages : 211
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Book Description
At the end of the last century and the beginning of this century, the prob lems of immunity in lower vertebrates and the influence of environmental temperature attracted attention for the first time (ERNST, 1890; WIDAL and SICARD, 1897; METCHNIKOFF, 1901). However, relatively little work has been done on this subject until recently. The early investigators were chiefly in terested in the immuno-pathological problems. They immunized various species of lower vertebrates essentially with bacterial vaccines; agglutinating, neutralizing and protective antibodies were detected in their blood. The in fluence of environmental temperature on the immune response was investigated, since this subject represented great economical and theoretical importance. Epizootic diseases were observed to occur in relation to the cold season of the year, when the decrease or spontaneous increase of water temperature occurred (SCHAPERCLAUS, 1965; BESSE et al. , 1965; KLONTZ et al. , 1965 WOOD,1966). The immunological deficiency of fish, caused by their natural or experimental stay in cold water, is now evident for both humoral and cellular immunity. In this review we will focus on two points: We shall attempt (1) to explain the mechanism by which the environmental temperature influences the immune resistance of fish to pathogens, (2) to determine the chronological location of this temperature-sensitive stage in the process of antibody formation, and to make some approaches to the general antibody formation mechanism.
Author:
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Category : Science
Languages : en
Pages : 600
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Book Description
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Category : Botany
Languages : en
Pages : 888
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Book Description
Author:
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Category : Science
Languages : en
Pages : 596
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Book Description
Records of meetings 1808-1916 in v. 11-27.
Author: Fredric M. Menger
Publisher: World Scientific
ISBN: 1848163363
Category : Science
Languages : en
Pages : 313
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Book Description
This book delves into one of the greatest riddles perplexing modern science: ?Why are humans so smart?? In a format understandable even by the non-expert, the author investigates the origins of human intelligence, starting with classical Darwinian concepts. Thus, the strengths and beauty of natural selection are presented with many examples taken from natural history. Common criticisms of Darwin, from scientists and non-scientists alike, are confronted and shown to be either inconclusive or outright false.The author then launches into a discussion of human intelligence, the most important feature of human evolution, and how it cannot be fully explained by mutational selection. Modern humans are smarter than what is demanded by our evolutionary experience as hunter-gatherers. The difficulty lies in the inability of natural selection to answer the following question: how can a complex set of genes, controlling expensive traits with little immediate benefit, come into permanent existence within a short time period in every member of a small population (which was dispersed and geographically isolated over a huge planet) which had a low reproductive output and a low mutation rate?The book concludes with a speculative epigenetic theory of intelligence that does not require DNA mutations as a source of evolution. Although the book is comprehensible by anyone with a college education, this last section in particular should intrigue both layman and expert alike.
