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排序方式: 共有47条查询结果,搜索用时 62 毫秒
1.
Dunahay Terri G. Jarvis Eric E. Dais Sonja S. Roessler Paul G. 《Applied biochemistry and biotechnology》1996,57(1):223-231
Applied Biochemistry and Biotechnology - Genetic transformation of two species of diatoms has been accomplished by introducing chimeric plasmid vectors containing a bacterial antibiotic resistance... 相似文献
2.
C. M. Paleos C. Christias G. P. Evangelatos Photis Dais 《Journal of polymer science. Part A, Polymer chemistry》1982,20(9):2565-2573
The synthesis of a novel vesicle-forming surfactant monomer, i.e., of di(undecenyl) phosphate is reported. Vesicles formed from this monomer were irradiated by γ rays for the production of polymeric vesicles. Polymerization was studied in conjunction with the model of the monomeric vesicles and the structure of the polymers was primarily studied with 1H-NMR spectra. It was further established that polymerized vesicles retain the structure of their monomeric counterparts while exhibiting higher stability than the unpolymerized vesicles. 相似文献
3.
C. M. Paleos Photis Dais Angelos Malliaris 《Journal of polymer science. Part A, Polymer chemistry》1984,22(11):3383-3391
To study the effect of micellar aggregation upon polymerization and polymer products, the polymerization of the micelle forming monomer allyldimethyldodecylammonium bromide (I) was investigated under both micellar and isotropic conditions. NMR spectroscopy and fluorescence quenching were employed to elucidate the structural characteristics and molecular weight of the polymer obtained by γ-ray irradiation. It was found that (I) undergoes effective polymerization in the micellar state, producing a polymer which consists of a mixture of head to tail and head to head configurations at the ratio 85/15, and has a mean molecular weight of 11,000 ± 1000 daltons. 相似文献
4.
The polymerization in micellar and isotropic media of a head-tail pair of surfactants, i.e. of monomers bearing the methacrylate group either at the polar head or at the end of the lipophilic chain is investigated in this study. Owing to the tailor-made structure of these monomers, any differentiations observed in their polymerization can be primarily attributed to topochemical effects resulting from the different location of the polymerizable group in the two monomers. Both monomers exhibited mesomorphic-like textures, which were examined by optical microscopy and DSC studies. Also, their respective polymers showed mesomorphic behaviour, which was found to be dependent on the position of the backbone relative to the polar head. 相似文献
5.
An immediate generalization of the classical McKay correspondence for Gorenstein quotient spaces ? r /G in dimensions r ≥ 4 would primarily demand the existence of projective, crepant, full desingularizations. Since this is not always possible, it is natural to ask about special classes of such quotient spaces which would satisfy the above property. In this paper we give explicit necessary and sufficient conditions under which 2-parameter series of Gorenstein cyclic quotient singularities have torus-equivariant resolutions of this specific sort in all dimensions. 相似文献
6.
James M. Photis 《Journal of heterocyclic chemistry》1971,8(5):729-733
Various alkyl and aryl carboxynitrenes generated thermally from the azidoformates react with para-di-t-butylbenzene with a high degree of selectivity to yield predominantly, or exclusively, 3,6-di-t-butylazepine-N-carboxylates. 3,6-Dialkylazepines react readily with tetracyanoethylene to afford the first known TCNR-1H-azepine cycloadducts of the 1,6 type. 相似文献
7.
D. Tsiourvas C. M. Paleos Photis Dais 《Journal of polymer science. Part A, Polymer chemistry》1990,28(5):1263-1271
Polymaleic anhydride prepared by γ-rays irradiation of maleic anhydride was used as a reactive polymer and reacted with certain long-chain aliphatic amines and/or alcohols as well as with the mesogenic biphenylamine. The homopolymers and copolymers that were prepared, i.e., derivatives of N-alkyl polymaleamic acid, monoesters of polymaleic acid, or mixed amide-ester derivatives, were primarily investigated as far as their property to show thermotropic liquid crystalline character is concerned. By this investigation the structural features for the exhibition of mesomorphism by these polymers were determined. 相似文献
8.
Leonid I. Galtchouk Photis P. Nobelis 《Statistical Inference for Stochastic Processes》1999,2(1):31-56
This paper proposes a sequential procedure for testing the null hypothesis absence of a drift in the Wiener process against the hypothesis that the drift is present. The decision is taken on the basis of current and randomly delayed observations. For any given error probabilities, the optimal decision rule minimizes a certain convex combination of the mean durations corresponding to these hypotheses. By a special geometric result, a convex characterization of the risk is obtained, and the initial problem is reduced to the optimal stopping problem. 相似文献
9.
C. M. Paleos S. Voliotis G. Margomenou-Leonidopoulou Photis Dais 《Journal of polymer science. Part A, Polymer chemistry》1980,18(12):3463-3468
In the present study radiation-induced polymerization of 3n-dodecyl-1-vinylimidazolium iodide (I) in micellar aggregates was investigated. For comparison, the corresponding isotropic polymerization of I was also studied. Micellization was obtained in concentrated aqueous solutions; that is, above the monomer's critical micelle concentration (CMC) polymers obtained by both modes of polymerization were treated similarly and subsequently subjected to physical characterization. The main purpose of this study was to investigate whether the degree of organization of the monomer in micelles would affect polymer properties. Attempts to determine tacticity by 13C-NMR spectrometry failed because of the particular structure of the polymer. Crystallization of these polymers from ethyl alcohol or acetone was not possible as indicated by x-ray powder diffraction patterns that were characteristic of amorphous polymers. On the other hand, viscosity data of polymers do not depend on the mode of polymerization. It is therefore concluded that micellar aggregates are not sufficiently organized to affect polymer properties. 相似文献
10.
P NMR spectroscopy in food analysis 总被引:1,自引:0,他引:1