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4 days ago · The Germ Plasm: A Theory of Heredity In this work, Weismann argued that inheritance (in a multicellular organism) only takes place by means of the germ cells &mdash
4 days ago · August Weismann was one of the most influential biologists of the late nineteenth century. In The Germ-Plasm he lays out a new theory of heredity, one based on the continuity of the germ-plasm (the gametes and the cells that give rise to the gametes) as opposed to the finite existence of the soma (the cells of the body).
5 days ago · It includes distinct sections on ideas of contagion and epidemics, humoral and germ theories, and public health and vaccination. The introductory essay to the section on ‘Concepts of contagion and epidemics’ does a pretty good job of rendering what were often very imprecise notions of contagiousness intelligible to non-expert readers.
5 days ago · Hint:August Weismann was a biologist who proposed the germ plasm theory in his book Das Keimplasa. Weismann’s germ plasm theory states that germplasm is independent of all the other cells of the body and carries the genetic material that is passed through generations.
3 days ago · 1892: Weismann barrier and germ plasm by August Weismann; 1908: Hardy–Weinberg principle by Wilhelm Weinberg; 1928: First reliable pregnancy test by Selmar Aschheim and Bernhard Zondek; 1928: Artificial cloning of organisms by Hans Spemann and Hilde Mangold; 1932: Urea cycle by Kurt Henseleit and Hans Adolf Krebs
6 days ago · Researchers create GF animals in laboratories by delivering the newborn animals in a way that protects them from microbes, which are microscopic organisms such as bacteria and viruses. They then house the GF animals in sterile conditions to ensure that the animals stay germ free. The creation of GF animals began in the late nineteenth century.
2 days ago · The DNA damage theory of aging proposes that aging is a consequence of unrepaired accumulation of naturally occurring DNA damage. Damage in this context is a DNA alteration that has an abnormal structure. Although both mitochondrial and nuclear DNA damage can contribute to aging, nuclear DNA is the main subject of this analysis.
