Ebook {Epub PDF} How and Why We Age by Leonard Hayflick

 · During the twentieth and twenty-first centuries in the United States, Leonard Hayflick studied the processes by which cells age. In at the Wistar Institute in the US, Hayflick researched a phenomenon later called the Hayflick Limit, or the claim that normal human cells can only divide forty to sixty times before they cannot divide any further. Learning more about the way cells age is important because old cells make us vulnerable to age related diseases. Hayflick discovered that normal cells have a counting mechanism that is tied to DNA replication. He also found that, unlike normal cells, cancer cells are immortal. Hundreds of researchers have built upon Hayflick's discoveries. Hayflick, Leonard. Ho w and Why We Age. New York: B allantine. 6. Caplan, Arthur. Is aging a disease? In Arthur. Caplan, If I W ere a Rich Man Could I Buy a Pancreas? www.doorway.ruted Reading Time: 6 mins.

In the early s we overthrew this dogma after finding that normal cells do have a finite replicative capacity, and we interpreted this phenomenon to be aging at the cellular level Hayflick and Moorhead , Hayflick We pointed out that there are two classes of cells, normal mortal cells and immortal cancer cells (Hayflick, ). With this book, Hayflick, a professor of biology (Univ. of California Medical School) who specializes in the study of aging, makes a valiant—and largely successful—attempt to summarize for lay readers the current research and theories in his field. Old age, as Hayflick points out, is in its infancy: Only during this century, and only in industrialized nations, have people lived long enough. In rich countries, more than 80% of the population today will survive past the age of About years ago, only 20% did. In all this while, though, only one person lived beyond the age of

How and why we age by Leonard Hayflick. Publication date Topics Aging -- Popular works, Aging -- Physiological aspects Publisher Ballantine Books Collection. Synopsis. About this title. Preeminent cell biologist Leonard Hayflick reveals the results of more than thirty years of pioneering research in the field of aging. Gracefully written, clearly organized, and packed with essential facts and statistics, "How and Why We Age" is a landmark study of the aging process for readers of all ages. His book, How and Why We Age, which is written "for the intelligent reader of any age who is curious about biogerontology, the biology of aging," is the first comprehensive, unbiased account of its kind to document what is presently known in this field. He distinguishes the biological aspects of aging - normal, genetically programmed phenomena - from the medical aspects - abnormalities such as diseases or illnesses which may occur as normal age increases the body’s vulnerability.