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Itsuro Matsuo Muneo Ohkido Hitoshi Fujita Kenshi Suzuki 《Photochemistry and photobiology》1980,31(2):175-178
Abstract— When a suspension of Escherichia coli was irradiated with near-UV light in the presence of chlorpromazine (at a concentration below a cytotoxic level), the cells were killed. Efficiency of the photodynamic killing was not influenced by the deficiency of the uvrA gene or the recA gene. Neither phenotypic reversion of E. coli Hs30R (arginine auxotroph) nor induction of lambda prophage in lysogenic bacteria was detected after this treatment. 相似文献
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Abstract— The relative photoinduced toxicity of five benzothiadiazine diuretics was assessed with respect to their potentiality to inactivate bacteriophage lambda by exposure to near-UV light in a semi-aqueous solution of 40% N,N-dimethylformamide. The results showed the following order for the toxicity on a quantum yield basis: penflutizide > trichlormethiazide > methichlothiazide > benzylhydrochlorothiazide > hydrochlorothiazide. Since the bacteriophage was inactivated even when mixed with preirradiated solutions of the diuretics, some photoproducts are responsible for the photoinduced toxicity of the diuretics. Although a lowered pH affected the infectivity, it was a minor factor. 相似文献
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Abstract Polarographic reduction and electrolytically initiated anionic polymerization of various monomers have been investigated with tetra-n-butylammonium perchlorate in dimethoxyethane. 相似文献
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Hideaki Ishihara Itsuro Kimura Nori Yoshihara 《Journal of Macromolecular Science: Physics》2013,52(5-6):713-733
Structure studies on the segmented polyurethane-urea based on poly(tetramethylene glycol), 4,4'-diphenylmethane diisocyanate, and 4,4'-diaminodiphenylmethane have been made using wide- and small-angle x-ray diffraction. It was found that the hard segments have a well-defined crystal structure indexed by a monoclinic unit cell with dimensions a = 4.72 Å, b = 11.33 Å, c (chain axis) = 11.64 Å, and γ = 116.5°. Further, the hard segments have an anisotropic supermolecular structure, that is, a spherulitic crystalline texture. The microdomain structure depends on the molecular weight of the soft segments, with phase separation becoming distinct with an increase in the molecular weight of the soft segment. Based on the long period observed in small-angle x-ray patterns of heat-set specimens, the thickness of lamellae was estimated to be about 93 Å. This corresponds to an average hard segment sequence length of 8. On deformation, the hard segment orients preferably transverse to the stretch direction up to high elongations, and it shows a hysteresis of orientation. This phenomenon can be explained in terms of the anisotropic supermolecular structure. Further, deviation from ideal rubber elasticity observed in the stress-strain relationships of the segmented polyure-thane-urea elastomers might also be caused by the anisotropic structure. 相似文献
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Shunji Nomura Hiromichi Kawai Itsuro Kimura Mitsuyasu Kagiyama 《Journal of Polymer Science.Polymer Physics》1970,8(3):383-400
A mathematical representation of orientation distribution of structural units within the bulk polymer is given in terms of an expansion of the distribution function in a series of spherical harmonics. Each coefficient of the expanded series is discussed in general relation to the orientation factors, average degrees of orientation distribution, defined by several different authors independently. Several optical techniques to evaluate the orientation factors, the second and fourth moments of orientation distribution of crystalline and noncrystalline structural units from optical dichroic quantities, are discussed. Some graphical representations of the state of orientation are proposed, and the estimation of orientation distribution from the orientation factors of different orders is discussed quantitatively. 相似文献