By Gennady Zaikov, Sharpatyi
This monograph—based at the authors direction lectures on radiation chemistry of biopolymers—deals with the first levels of radiation-chemical transformation of major biopolymers. distinct realization is given to radiolysis in their aqueous recommendations, formation and conversion mechanisms of macroradicals, synthesized in acts of solvent radical interplay with biopolymer molecules and of their ordinary complexes.
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Extra resources for Radiation chemistry of biopolymers
Chaotic disposition of solvent and dissolved substance molecules is preserved, the yield of water radiolysis primary products will approach its value for the liquid-phase radio lysis. For such solvents-matrices, used for observation of radiolytic properties of substances, acid, alkaline and mixed salt solutions are taken organic compounds and water solutions forming transparent quasi glassy-like structures at quick freezing (by steeping to liquefied nitrogen). Variation of the composition of these matrices creates conditions for accumulating one water radiolysis product or another with the maximum yield and inspecting their interactions with the substances under study.
3. Energy may be transmitted, if excited molecule is somehow regulated with the surrounding ones, as, for example, excited molecule in a crystal. The electronic excitation (exciton) is quickly transmitted from one molecule to another, remaining each molecule in the excited state for a very short time (about a single vibration period). The lifetime of exciton equals ~ 1o- 8 s (in solids, activated admixtures, scintillating fluids, crystals, polymeric molecules, and less frequently in liquids). For many cases, to explain high exciton transmission rate in some scintillating fluids, the existence of domains - small regulated groups of molecules (1 0 - 15 molecules each) - was suggested.
Sharpatyi 36 For the majority of paramagnetic particles, the resonance absorption represents a complex curve, which is ESR spectrum characterized by the following parameters: band intensity, width and shape, g-factor value, and hyperfine structure (HFS) of the spectrum. These parameters define the origin and structure of paramagnetic particles, their interaction with one another and the environment. 1e or H = gfJHSz. The interaction between a nucleus and electron (hydrogen atom is the simplest example) is described by the following Hamiltonian: where lz is the Z-axis component of the nuclear spin.