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81.
Raman scattering and relaxed fluorescence is observed upon cw laser excitation resonant with the lower vibrational manifold of the X(1Σo+u) → B(3Πo+u) transition of matrix isolated Br2 at liquid He temperatures. The excitation profile of the relaxed fluorescence maps out the resonances, but neither detectable enhancement of Raman scattering nor resonance fluorescence is observed. 相似文献
82.
Applied Biochemistry and Biotechnology - Although lignocellulosic biomass and wastes are targeted as an attractive alternative fermentation feedstock for the production of fuel ethanol, cellulosic... 相似文献
83.
Alain Valtz 《Thermochimica Acta》2006,443(2):251-255
Densities of the water + ethylenediamine binary system were measured at atmospheric pressure over the whole range of compositions at temperatures from 288.15 to 353.15 K using an Anton Paar digital vibrating glass tube densimeter. Density increases with water content. The experimental excess molar volume data have been correlated with the Redlich-Kister equation, and partial molar volumes calculated at infinite dilution for each component. 相似文献
84.
Alain Escassut 《Journal of Number Theory》1983,16(3):395-402
Let (K, ∥ · ∥) be a valued transcendence degree 1 extension of p. An element x ∈ K transcendental over p is said to have order ≤a (a > 0) if there exists Cx > 0 such that every polynomial P(X) ∈ p [X] satisfies when ∥ · ∥ is the Gauss norm on p[X]. No x ∈ p can have order ≤α if α < 1 but we construct some x ∈ p with order ≤ 1. Furthermore, we prove order ≤α is stable by algebraic extension. 相似文献
85.
Kanibolotsky A Roquet S Cariou M Leriche P Turrin CO de Bettignies R Caminade AM Majoral JP Khodorkovsky V Gorgues A 《Organic letters》2004,6(13):2109-2112
[structure: see text] In four new dendrimers terminated by 12 electroactive tetrathiafulvalenyl substituents, the tridimensional character of the inter- and intradendrimeric charge and electron transfer, and hence of the electroconductivity, is evidenced by examination of the electronic spectra of their corresponding neutral state and cation radical, dication, and mixed-valence salts, including a closed-shell anion. 相似文献
86.
Max Winter Karl H. Schulte-Elte Alain Velluz Josef Limacher Wilhelm Pickenhagen Günther Ohloff 《Helvetica chimica acta》1979,62(1):131-134
Aroma Constituents of the Purple Passion Fruit. Two New Edulan Derivatives The isolation of (2R*, 4S*, 4aS*, 8aS*)-4,4a-epoxy-4,4a-dihydroedulan ( 1 ), and (2R*, 3S*, 8aS*)-3-hydroxyedulan ( 2 ), two new constituents of the purple passion-fruit (Passiflora edulis SIMS ), is reported. Racemic epoxide 1 was synthesized by oxidation of edulan 6 with peracidic acid, and racemate of alcohol 2 was obtained by reduction of ketone 7 , one of the chromic acid oxidation-products of edulan 6 . 相似文献
87.
88.
Understanding the interactions between molecules and living organisms is of paramount importance for the evaluation of pharmaceutical activity, chemical toxicity and all manner of microbiological studies. The capability of capillary electrophoresis (CE) in the evaluation of molecule-microbe interactions is examined in the present paper. The fundamental chemical concept of the binding or association constant for molecular systems measured in free solution is discussed for biological systems where microorganisms uptake or associate with molecules from their environment. The heterogeneity of the living organisms must be understood and accounted for including differences related to semantics such as concentration units and the nature of the associations between two entities and large differences in the size and number of microorganisms as compared to molecules. Finally, the added complexity and even inhomogeneity of a cell compared to most molecular systems must be considered and possibly controlled. The binding of specific molecules to viruses is discussed. CE can be utilized to quickly determine if a molecule binds very strongly or not at all to a cell (i.e., a binary yes/no answer). This could be useful for initial high-throughput screening purposes when using capillary arrays, for example. CE can be useful for determining unusual (large) molecule/microbe stoichiometries. Finally, CE can sometimes be used to determine the size of binding constants (K(RL)) within certain limits provided experimental conditions can be formulated that minimize problems of biological heterogeneity. 相似文献
89.
A primary cleavage of aliphatic ozonides by electron-impact, implying O? O and C? C bond breaking, is described. This mode of degradation, which is not observed for aromatic ozonides, is fav oured by electron releasing substituents. For the cis and trans 4-methyl-2pentene ozonides, the ionization potentials are 8.81 and 8.86 (±0.5) eV, respectively. Two formation thresholds are observed for the [RCHO2]+ion which are interpreted in terms of different modes of ozonide cleavage. 相似文献
90.
Jean-Luc Decout Alain Lablache-Combier Claude Loucheux 《Journal of polymer science. Part A, Polymer chemistry》1980,18(7):2371-2390
Vinylpyridine-N-oxide units were introduced in polymeric chains in order to study their photocrosslinking. Copolymers of styrene and 4-vinylpyridine-N-oxide were especially synthesized and studied. The methods used for characterization of photocrosslinked films were a “photoresist test” or the measurement of the insolubility and of the swelling ratio. The Cleavage of the N-oxide bond was responsible for the photocrosslinking. The competitive formation of carbonyl compounds took place and decreased the rate of photocrosslinking. This last reaction is favored by triplet-state quenchers. The photosensitivity of the copolymers was determined as a function of the wavelength of the radiation used. When the photocrosslinking proceeded, a film of the copolymeric material became transparent in the 280–320-nm range. Thick films could therefore be completely photocrosslinked when irradiated in this range of wavelength. 相似文献