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Inter-specific interactions

During the evolution of living systems and the interdependent coevolution of new metabolic and regulatory qualities some so-called secondary products have acquired a physiological role not only for intra- or inter-specific interactions of individuals (e.g. pheromones, phytoalexins etc.) but also for the interaction between cells of the producing organisms themselves (e.g. hormones and hormone-like regulatory effectors) (Ref. 1). Thus, as indicated by the pathways of biosynthesis and metabolism, the plant hormones so far... [Pg.2]

This refinement of the constrained-junction model is based on re-examination of the constraint problem and evaluation of some neutron-scattering estimates of actual junction fluctuations [158, 159]. It was concluded that the suppression of the fluctuations was over-estimated in the theory, presumably because the entire effect of the inter-chain interactions was arbitrarily placed on the junctions. The theory was therefore revised to make it more realistic by placing the effects of the constraints along the network-chain contours, specifically at their mass centers [4, 160, 161]. This is illustrated in the second portion of Figure 2. Relocating the constraints in this more realistic way provided improved agreement between theory and experiment. [Pg.227]

Benzophenone is another example of a molecule showing small-molecule behavior in a specific region of its absorption spectrum 30<31). Here it concerns intersystem crossing between the lowest excited singlet and triplet states, which are separated by about 2800 cm-1. Very fast intersystem crossing is induced by inter molecular interactions 3°). Under isolated-molecule conditions relative to the radiative lifetime as calculated from the integrated oscillator strength, irreversible behavior is not obtained. [Pg.127]

H. Taketomi, Y. Ueda, N. Go (1975) Studies on protein folding, unfolding and fluctuations by computer-simulation. 1. effect of specific amino-acid sequence represented by specific inter-unit interactions. Int. J. Pept. Protein Res. 7, p. 445... [Pg.430]

In discotics, the interdisk stacking interaction is several orders of magnitude stronger than the inter-columnar interactions, because of the phase separation induced by the side-chains whose van der Waals interactions are much weaker. Generally, long polymers are obtained via discotics that have strong and specific intermolecular interactions, either via a large aromatic core or via additional specific intermolecular... [Pg.317]

Woo the temperature dependence of pitch for chiral nematic polymers does not seem to follow any particular pattern. It is believed that as temperature is increased, specific interactions, e.g., hydrogen bonding, whether inter- or intramolecular or polymer-solvent interactions are destroyed. The polymer chains become more flexible and the side groups more easily relaxed, thereby changing the physical properties of the chiral nematic structure. Similarly, an increase in concentration leads to a decrease in pitch for most lyotropic cellulosic liquid crystals with the exception of cellulose tricarbanilate (CTC) in ethyl methyl ketone, 2-penta-none, or tiiethylene glycol monoether and the chlorophenyl urethane derivative in diethylene glycol monoether. ... [Pg.2666]

A series of polymer blends with inter-polymer specific interactions were... [Pg.183]

Kazarian SG, Vincent MF, Bright FV, Liotta CL, Eckert CA. Specific inter-molecular interaction of carbon dioxide with pol5uners. J Am Chem Soc 1996 118 1729-1736. [Pg.23]


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