Comparative Biology Of Aging

determined by an inability to move in response to touch. C. elegans develop through four larval stages following hatching and prior to adulthood. Adult C. elegans are reproductive for about the rst week of adulthood followed by approximately two weeks of post-reproductive adulthood prior to death. Life span is most commonly measured in the laboratory by maintaining the worms on the surface of a nutrie- agar medium (Nematode Growth Medium, NGM) with E. coli OP50 as the bacterial food source (REF). Alternative culture conditions have been described in liquid media; however, these are not widely used for longevity studies. Longevity of the commonly used wild type C. elegans hermaphrodite (N2) varies ? from 16 to 23 days under standard laboratory conditions (20 C, NGM agar, E. coli OP50 food source). Life span can be increased by maintaining animals at lower ambient temperatures and shortened by raising the ambient temperature. Use of a killed bacterial food source, rather than live E. coli, increases lifespan by 2–4 days, and growth of adult animals in the absence of bacteria (axenic growth or bac- rial deprivation) increases median life span to 32–38 days [3, 23, 24]. Under both standard laboratory conditions and bacterial deprivation conditions, wild-derived C. elegans hermaphrodites exhibit longevity comparable to N2 animals [25].

This unique book looks at the biology of aging from a fundamentally new perspective, one based on evolutionary theory rather than traditional concepts which emphasize molecular and cellular processes. The basis for this approach lies in the fact that natural selection, as a powerful determining force, tends to decline in importance with age. Many of the characteristics we associate with aging, the author argues, are more the result of this decline than any mechanical imperative contained within organic structures. This theory in turn yields the most fruitful avenues for seeking answers to the problem of aging, and should be recognized as the intellectual core of gerontology and the foundation for future research. The author ably surveys the vast literature on aging, presenting mathematical, experimental, and comparative findings to illustrate and support the central thesis. The result is the first complete synthesis of this vital field. Evolutionary biologists, gerontologists, and all those concerned with the science of aging will find it a stimulating, strongly argued account.

Demographers and public health specialists have been surprised by the rapid increases in life expectancy, especially at the oldest ages, that have occurred since the early 1960s. Some scientists are calling into question the idea of a fixed upper limit for the human life span. There is new evidence about the genetic bases for both humans and other species. There are also new theories and models of the role of mutations accumulating over the life span and the possible evolutionary advantages of survival after the reproductive years. This volume deals with such diverse topics as the role of the elderly in other species and among human societies past and present, the contribution of evolutionary theory to our understanding of human longevity and intergenerational transfers, mathematical models for survival, and the potential for collecting genetic material in household surveys. It will be particularly valuable for promoting communication between the social and life sciences.

Conn's Handbook of Models for Human Aging, Second Edition, presents key aspects of biology, nutrition, factors affecting lifespan, methods of age determination, use in research and the disadvantages/advantages of use. Using a multidisciplinary approach, this updated edition is designed as the only comprehensive, current work that covers the diversity in aging models. Chapters on comparative models explore age-related diseases, including Alzheimer's, joint disease, cataracts, cancer and obesity. Also included are new tricks and approaches not available in primary publications. This must-have handbook is an indispensable resource for researchers interested in the mechanisms of aging, gerontologists, health professionals, allied health practitioners and students. Combines both the methods of study for human aging and animal models Provides a historical overview and discussion of model availability, key methods and ethical issues Contains over 200 full color illustrations

Comparative Biology of the Normal Lung, Second Edition, offers a rigorous and comprehensive reference for all those involved in pulmonary research. This fully updated work is divided into sections on anatomy and morphology, physiology, biochemistry, and immunological response. It continues to provide a unique comparative perspective on the mammalian lung. This edition includes several new chapters and expanded content, including aging and development of the normal lung, mechanical properties of the lung, genetic polymorphisms, the comparative effect of stress of pulmonary immune function, oxygen signaling in the mammalian lung and much more. By addressing scientific advances and critical issues in lung research, this 2nd edition is a timely and valuable work on comparative data for the interpretation of studies of animal models as compared to the human lung. Edited and authored by experts in the field to provide an excellent and timely review of cross-species comparisons that will help you interpret and compare data from animal studies to human findings Incorporates lung anatomy and physiology, cell specific interactions and immunological responses to provide you with a single and unique multidisciplinary source on the comparative biology of the normal lung Includes new and expanded content on neonatal and aged lungs, developmental processes, cell signaling, antioxidants, airway cells, safety pharmacology and much more Section IV on Physical and Immunological Defenses has been significantly updated with 9 new chapters and an increased focus on the pulmonary immunological system

Most of the DNA in the human genome does not encode proteins but is involved in regulatory functions. In addition, the human genome is characterized by an extensive array of structural DNA variants arising from de novo mutations plus accumulated structural variants transmitted through an individual's lineage. The result is that each person has a unique genome which is expressed as that person's unique phenotype. Ageing can be understood on both the species and individual level. Each species has a programmed ageing and mortality pattern, but within those broad species-specific boundaries there is considerable individual variation. At the individual level, ageing reflects the integrated effects of that individual's unique mix of DNA structural variants, unique experience-specific epigenetic marks and imperfectly repaired genomic and cellular damage. This book examines human "chronic degenerative" diseases which are not diseases, but rather variations of the ageing process across individuals.

Robert Arking's Biology of Aging is an introductory text to the biology of aging which gives advanced undergraduate and graduate students a thorough review of the entire field. The mass of data related to aging is summarized into fifteen focused chapters, each dealing with some particular aspect of the problem. His prior two editions have also served admirably as a reference text for clinicians and scientists. This new edition captures the extraordinary recent advances in our knowledge of the ultimate and proximal mechanisms underlying the phenomenon of aging.

"This book is exemplary in amassing demographic, policy, and sociopsychological data from around the world to refute both premises: that countriesí aging is not occurring in developing nations and that aging of the population presents intractable predicaments. The content of the book is rich with current information seldom accumulated into one source. For a scholar of aging studies, the topics are comprehensive, including demographics, political systems, health and long-term care provision, employment/retirement, and formal and informal support systems. Structurally, the book adds value with the inclusion of Web resources and a robust index. The design is conducive for a classroom setting by incorporating discussion questions and key words at the end of each chapter." -- Dr. Carol A. Gosselink, PsycCritiques Using a comparative, cross-national perspective, Global Aging: Comparative Perspectives on Aging and the Life Course explores the major topics in social gerontology worldwide and the demands that the aging population places on a society. This comprehensive and timely guide includes contributions from international gerontology scholars and illustrates both universal and socioculturally unique aspects of aging across nations. It is organized thematically for ease of use and includes an abundance of photographs and illustrations to highlight key points. Key features: Discussions on various nations' policies and programs designed to meet the unique needs of an older population An essay on pension and income maintenance policies and programs An analysis of the role of local and national governments, as well as non-governmental organizations, in serving older adults Case studies on specific aspects of aging: family life, caregiving, policies and politics, health and long-term care, and work and retirement The most current demographic data on aging around the world

Featuring extensive references, updated for this paperback edition, Longevity, Senescence, and the Genome constitutes a landmark contribution to biomedicine and the evolutionary biology of aging. To enhance gerontology's focus on human age-related dysfunctions, Caleb E. Finch provides a comparative review of all the phyla of organisms, broadening gerontology to intersect with behavioral, developmental, evolutionary, and molecular biology. By comparing species that have different developmental and life spans, Finch proposes an original typology of senescence from rapid to gradual to negligible, and he provides the first multiphyletic calculations of mortality rate constants.