Growth And Aging In Insects
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Growth And Aging In Insects
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Author : Howard A. Schneiderman
language : en
Publisher:
Release Date : 1955
Growth And Aging In Insects written by Howard A. Schneiderman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1955 with Insect growth categories.
Insect Aging
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Author : Klaus-Günter Collatz
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Insect Aging written by Klaus-Günter Collatz and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
"Leben ist die schonste Erfindung der Natur und der Tod ist ihr Kunstgriff, viel Leben zu haben" . J. W. v. Goethe Life is the most beautiful invention of nature, and death is her device to exhibit most life. The eminent British biologist Sir Vincent B. Wigglesworth noted in 1939 that insects are an ideal medium in which to study all problems of physiology. Many fundamental discoveries in biology, particularly genetics and development, have been made on the basis of studies conducted in insects. Because of their ex treme adaptability and diversity, an appropriate insect model is available for the study of virtually any biological problems. The applicability to other groups, including mammals, of basic studies conducted on insects has helped in the gradual acceptance of the fundamental unity of biochemical principles as a dogma among biologists, as well as among enlightened medical scientists. With the recent upsurge of interest in the study of the aging process, in sects have been increasingly employed not only for the investigation of basic mechanisms of aging, but also to gain insight into the evolution of aging and senescence. If only one aging mechanism exists, it is foreseeable that some in sects, especially Drosophila, will help to unravel its molecular basis. Because of their diversity, existing studies in the gerontology of insects are widely scat tered in various specialized journals. This wealth of existing information has not, as yet, been brought together in a synthesized and comprehensive form.
Molecular Genetic Mechanisms In Development And Aging
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Author : Morris Rockstein
language : en
Publisher: Elsevier
Release Date : 2012-12-02
Molecular Genetic Mechanisms In Development And Aging written by Morris Rockstein and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-02 with Science categories.
Molecular Genetic Mechanisms in Development and Aging discusses the mechanisms of aging at the level of the genome. This book explores the fundamental knowledge concerning the regulation and expression of gene, which is derived from investigations on microbial organisms. Organized into nine chapters, this book starts with an overview of the molecular genetic basis for the processes of aging. This text then explores the highly complex multicellular members of the class Insecta, which provide the researcher with many distinct and unique advantages for aging studies. Other chapters discuss the mechanisms of genetic control and organization during the development and aging of eukaryotes, which pose some challenging problems in cellular and developmental biology. The final chapter deals with the limitations of previous studies, including the lack of comparability due to differences in techniques, the measuring of free amino acid titers in hemolyph only, and differing diet and environmental variations. Biologists and students interested in developmental and molecular genetics will find this book useful.
Part A Biology Development And Aging
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Author : Ivar Agrell
language : en
Publisher:
Release Date : 1964
Part A Biology Development And Aging written by Ivar Agrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with categories.
The Physiology Of Insecta
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Author :
language : en
Publisher:
Release Date : 1964
The Physiology Of Insecta written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with categories.
The Physiology Of Insecta
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Author : Morris Rockstein
language : en
Publisher: Academic Press
Release Date : 2013-10-22
The Physiology Of Insecta written by Morris Rockstein and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Science categories.
The Physiology of Insecta, Second Edition, Volume I, is part of a multivolume treatise that brings together the known facts, the controversial material, and the many still unsolved and unsettled problems of insect physiology. Since the first edition of this multivolume treatise was published, there has been a notable expansion of scientific endeavor in each of the various aspects of insect physiology. The original three-volume work has now grown to a thoroughly revised six-volume treatise. The present volume contains six chapters and begins with a discussion of the biology of the Insecta. This is followed by separate chapters on the structure and origin of the female reproductive system; the control of oogenesis, semen production, sexual behavior, and ovipostion; physiological and biochemical changes during insect development; insect endocrinology; and aging in insects.
The Physiology Of Insecta
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Author : Morris Rockstein
language : en
Publisher:
Release Date : 1964
The Physiology Of Insecta written by Morris Rockstein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Insects categories.
Vol. 1, pt. A. Biology, development, and aging. pt. B. The insect and the external environment I -- v. 2, pt. B. The insect and the external environment II. pt. C. The insect and the internal environment-homeostasis I -- v. 3, pt. C. The insect and the environment-homeostasis II.
Developmental Systems Insects
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Author : S. J. Counce
language : en
Publisher:
Release Date : 1972
Developmental Systems Insects written by S. J. Counce and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Nature categories.
The causal analysis of insect embryogenesis; The development of spatial patterns in the integument of insects; The imaginal discs of drosophila; Role of hormones in insect development; The morphogenesis of patterns in drosophila.
The Biology Of Human Ageing
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Author : Society for the Study of Human Biology
language : en
Publisher: Cambridge University Press
Release Date : 1986-03-20
The Biology Of Human Ageing written by Society for the Study of Human Biology and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986-03-20 with Medical categories.
This book discusses the findings of a joint symposium held in 1984 to consider human ageing and longevity from an interdisciplinary point of view.
Molecular Basis Of Life History Evolution A Tale Of Two Insects
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Author : Silvia C. Remolina
language : en
Publisher:
Release Date : 2011
Molecular Basis Of Life History Evolution A Tale Of Two Insects written by Silvia C. Remolina and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The field of life-history evolution is aimed at understanding the diversity of fertility and longevity patterns observed in nature. These patterns are influenced by the interplay of traits that directly affect the fitness of individuals, including age at first reproduction, growth rate, age-specific fecundity, and age-specific survival. Variation in life-history strategies occurs because of phylogenetic constraints on organisms, influence of extrinsic factors on mortality (i.e. predation), and tradeoffs in energy allocation between competing physiological processes. Differences in life-history strategies have been well documented at the phenotypic level but their causal genetic mechanisms remain largely unknown. At the genetic level, tradeoffs between lifespan and reproduction have been hypothesized to arise because the force of natural selection decreases with advancing age and favors pleiotropic alleles that have beneficial effects on reproduction early in life even at the cost of survival later in life. Experimental evolution studies in Drosophila have highlighted the existence of tradeoffs between lifespan and reproduction that seem to be consistent with the concept of antagonistic pleiotropy. Selection for increased age at first reproduction, as well as selection for lifespan led to increases in lifespan and reduced early life fecundity in these flies. The underlying physiological cause of tradeoffs has been difficult to study because of the diversity of processes that influence life-history traits. Given that increases in lifespan have widespread influence on reproductive output, molecular geneticists interested in aging have documented survival costs of reproduction in long-lived individuals. Mutations in signaling pathways that couple environmental signals to key physiological processes affect growth, reproduction and lifespan. These studies have provided molecular mechanisms that are excellent candidates for regulating life history traits. However, whether natural variation in any of these genes is important in life history evolution remains an open question. My dissertation research focused on understanding differences in life histories in one eusocial and one non-social insect. Eusocial insects are good candidates to study mechanisms of tradeoffs between fecundity and survival. Eusocial insect queens enjoy a long lifespan that does not come at the cost of reduced fecundity, whereas workers are usually short lived and non-reproductive. Both queens and workers can potentially develop from larvae with identical genotypes but yet show strikingly different phenotypes as adults. My work on honey bee aging established the importance of intrinsic physiological factors in regulating differences in lifespan between queen and worker bees, and provided a potential mechanism for such differences. For the second part of my dissertation, I generated fruit fly strains with divergent life-histories to study the molecular underpinnings of life-history evolution. These studies were designed to investigate how phenotypic tradeoffs are regulated at the molecular level. I used a candidate gene approach to evaluate the role of insulin signaling in differential survival and reproduction. Results from this study do not support the involvement of genes in this pathway in life history divergence. A genome-wide screen was also employed to evaluate if other genes were involved in regulating the tradeoff between reproduction and lifespan in my fly strains. Genes involved in nutrient reservoir activity, stress response, and detoxification were differentially expressed between strains. This suggests that life history divergence in my fly lines was possible through differential energy allocation to competing processes (i.e. somatic maintenance vs. reproduction). Understanding variation among organisms in patterns of longevity and reproduction is a key goal of evolutionary biology. Research on the molecular mechanisms that regulate the evolution of life history traits will allow us to link the genetic architecture of these traits to the ecological factors that shape them and this will ultimately help us understand how organisms adapt to their environment. The study of the mechanistic basis of tradeoffs between lifespan and reproduction is also fundamental given the relationship between aging and other life-history traits.