The gelatinization rate of rice and potato starches were investigated. The rheological method, using a capillary tube viscometer, was applied for the measurement of the gelatinization degree. The gelatinization rates were measured for the rice and potato starches at temperature ranges of 70-85 and 60~63°C respectively. The rate parameter in the rate equation was given as the Arrhenius equation. The equivalent values of the activation energy for the rice and potato starches were about 14 and 230 k&/g-mol respectively. We concluded that the gelatinization rate of starches is limited by the chemical reaction rate and/or the physical transforming rate of starch components wi-ih water.

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We started to explore the proton-electron cooperative-interacting systems as new molecular materials which might have interesting solid state properties. Our current efforts are concentrated on the design and synthesis of a wide range of hydrogenbonded charge-transfer (HBCT) systems in both organic materials and transition metal complexes. The solid state properties of such systems are expected to depend on the type and strength of the cooperativity. In this report, we present the design and synthesis of new H-bonded transition metal complexes. In such transition metal complexes, the redox property of metal atoms and the intermolecular interactions through metal atoms can be utilized as the intermolecular CT interactions. In order to form the NH-N type H-bonding chains, 2,2'biimidazole ligand (Hbim) is selected. We prepared Ni2+ complexes ([Ni (Hbim)3] 1-) which contain a variety of crystal structures with H-bonding networks depending on the kind of the counter cations. The magnetic and electrical conducting properties of these complexes also will be presented.The spin lattice relaxation rate Tl-' of ' H was measured in the spin-density wave (SDW) phase of (TMTSF),AsF, and (TMTSF),CIO,. The temperature dependence of Tl-' shows a sharp peak at the SDW transition temperature T , , , .We found another divergent peak at the temperature T* much lower than TsDw in both materials. The ratio TsDw/r* is about 4 for (TMTSF),AsF,.In (TMTSF),ClO, T* decreases with decreasing TsDw according to the anion ordering but the ratio remains almost constant as Ts,,/"'*-3.5. These behaviors indicate that the mechanism of the divergent peak in Tl-' at T* is common to the SDW phase of (TMTSF),X salts and is closely related to the SDW transition. It is suggested that the structural change occurs in the SDW condensate. We propose the new phase boundary which divides the SDW phase into two sub-phases. 615

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