By Joseph Panno
Makes an attempt to appreciate the getting older technique have generated quite a few theories yet few useful cures. conventional cures deal with age-related ailments akin to melanoma and arthritis yet don't opposite the getting older method itself. a standard development in gerontology is to go looking for genes that experience a demonstrable influence on lifespan, the so-called durability genes. Many such genes were pointed out, and even if the manipulation of those genes doesn't cease the getting older procedure, they supply many helpful insights into the mobile mechanisms of getting older. extra lately, curiosity has became to using cloning expertise, stem mobilephone research, and genetic manipulation which will produce an efficient rejuvenation treatment for cells and the physique as a complete.
getting older, Revised variation describes the sphere of gerontology and the numerous theories that scientists have constructed through the years to provide an explanation for the age-related alterations that ensue in approximately all animals.
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Extra resources for Aging. Modern theories and therapies
The first, covering the early years, began around 1870, with the invention of the compound microscope and ended in the 1950s. The second epoch began with the discovery of the DNA double helix in 1952 and extended to the early 1970s. The third epoch began with the introduction of recombinant DNA technology in 1973, ending in the early 1990s. The current epoch, known as the post-genomic era, began with the formation of a genome-sequencing consortium in 1990 and continues to the present day. 4 The History of Gerontology 15 Gerontological research has always been driven by the same questions: Why do people grow old?
This proliferation of a segment of DNA is called amplification. To amplify a mammalian gene, bacteria are coaxed to take up a recombinant plasmid in a small test tube containing a special medium, after which they are transferred to a large flask containing nutrient broth and allowed to grow for 24 hours. By the end of the culturing period, the amount of cloned insert has increased more than a million fold. In 1977 Fred Sanger, a professor at Cambridge University, and Walter Gilbert, a professor at Harvard, developed methods for sequencing DNA.
Just as a suitcase makes it possible for us to take our clothes on a trip, histones and the chromatin structure they produce make it possible for the cell to package its genes in preparation for cell division (see Cell Biology in chapter 10 for additional information). Chromatin compaction, or condensation, is also used during interphase (the period between cell divisions) to help manage the chromosomes. It is also one mechanism for controlling gene expression. The packing ratio of interphase chromatin (condensed length divided by relaxed length) is about 1:1,000 overall, but there are highly condensed regions where it can be as low as 1:10,000.