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effect hypothesis effect hypothesis
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Signal Hypothesis Signal Hypothesis
Signal hypothesis The signal hypothesis was proposed to explain how proteins that were destined for export from bacteria or for targeting to certain regions within eucaryotic microorganisms (e.g., yeast ) achieved their target. The hypothesis was proposed in the 1970s by Günter Blobel,... Read more
hypothesis hypothesis
Hypothesis TestingBIBLIOGRAPHYThe formulation of hypotheses and their testing through observation are essential steps in the scientific process. A detailed discussion of their role in the development of scientific theories is given by Popper (1934). On the basis of observational evidence, a... Read more
Gaia Hypothesis Gaia Hypothesis
Gaia hypothesis The Gaia (pronounced GAY-ah) hypothesis is the idea that Earth is a living organism and can regulate its own environment. This idea argues that Earth is able to maintain conditions that are favorable for life to survive on it, and that it is the living things on Earth that give the... Read more
endosymbiotic hypothesis endosymbiotic hypothesis
endosymbiotic hypothesis The hypothesis that the plastid and mitochondrial organelles evolved from prokaryotic endosymbionts within eukaryotic cells early in eukaryotic evolution. At least two endosymbiotic events are postulated, one each for plastid and mitochondrial origins. It is contentious... Read more
individualistic hypothesis individualistic hypothesis
individualistic hypothesis The view, first proposed by H. A. Gleason in 1917, that vegetation is continuously variable in response to a continuously varying environment. Thus, no two vegetation communities are identical. It implies also that vegetation cannot be classified, and that recognition of... Read more
William Prout William Prout
William Prout 1785-1850, English chemist and physician. Prout's hypothesis, advanced in 1815-16, suggested that atomic weights of elements are multiples of that of hydrogen and that elements are formed by a condensation or grouping of hydrogen atoms. Later work on the determination of atomic... Read more
age-and-area hypothesis age-and-area hypothesis
age-and-area hypothesis J. C. Willis suggested in 1922 that, all other things being equal, the area occupied by a taxon is directly proportional to the age of that taxon. Thus in a polytypic genus, the species with the smallest area of distribution would be the youngest in the genus. However,... Read more
science science
science [Lat. scientia =knowledge]. For many the term science refers to the organized body of knowledge concerning the physical world, both animate and inanimate, but a proper definition would also have to include the attitudes and methods through which this body of knowledge is formed; thus, a... Read more
Crime reconstruction Crime reconstruction
Crime Scene Reconstruction The process of working out the sequence of events before, during, and after a crime is known as crime scene reconstruction. It is perhaps one of the aspects of forensic science that fascinates the public most, featuring in most police dramas. Reconstruction requires not... Read more

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