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The metabolic stability theory of aging suggests it is the cells ability to maintain stable concentration of ROS which is the primary determinant of lifespan. [37] This theory criticizes the free radical theory because it ignores that ROS are specific signalling molecules which are necessary for maintaining normal cell functions. [37]
The Rice–Ramsperger–Kassel–Marcus (RRKM) theory is a theory of chemical reactivity. [ 1 ] [ 2 ] [ 3 ] It was developed by Rice and Ramsperger in 1927 [ 4 ] and Kassel in 1928 [ 5 ] (RRK theory [ 6 ] ) and generalized (into the RRKM theory) in 1952 by Marcus [ 7 ] who took the transition state theory developed by Eyring in 1935 into account.
In organic chemistry, olefin metathesis is an organic reaction that entails the redistribution of fragments of alkenes (olefins) by the scission and regeneration of carbon-carbon double bonds. [1] [2] Because of the relative simplicity of olefin metathesis, it often creates fewer undesired by-products and hazardous wastes than alternative ...
Regeneration in biology is the process of renewal, restoration, and tissue growth that makes genomes, cells, organisms, and ecosystems resilient to natural fluctuations or events that cause disturbance or damage. [1] Every species is capable of regeneration, from bacteria to humans.
Methionine synthase catalyzes the final step in the regeneration of methionine (Met) from homocysteine (Hcy). Both the cobalamin-dependent and cobalamin-independent forms of the enzyme carry out the same overall chemical reaction, the transfer of a methyl group from 5-methyltetrahydrofolate (N 5 -MeTHF) to homocysteine, yielding ...
Description: This book explained Dalton's theory of atoms and its applications to chemistry. Importance: The book was one of the first to describe a modern atomic theory, a theory that lies at the basis of modern chemistry. [3]: 251 It is the first to introduce a table of atomic and molecular weights.
J.W. "Hans" Niemantsverdriet is a Dutch experimental physical chemist, surface scientist, author, and academic.He is a Professor Emeritus of Physical Chemistry of Surfaces at the Eindhoven University of Technology in the Netherlands and an Honorary Distinguished Professor at the Cardiff Catalysis Institute of Cardiff University.
The regeneration stage of Calvin's cycle. Substances and their parts are outlined in colors: green - carbon accepting aldoses, pink - ketoses-donors of three-carbon groups, yellow - parts of ketoses remaining after donation of two-carbon keto-groups highlighted in orange. Enzymes are also highlighted: aldolases in purple and transketolases in red.