全文获取类型
收费全文 | 111篇 |
免费 | 0篇 |
专业分类
化学 | 87篇 |
数学 | 1篇 |
物理学 | 23篇 |
出版年
2022年 | 2篇 |
2021年 | 3篇 |
2019年 | 4篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 7篇 |
2015年 | 4篇 |
2014年 | 4篇 |
2013年 | 7篇 |
2012年 | 6篇 |
2011年 | 3篇 |
2010年 | 8篇 |
2009年 | 2篇 |
2008年 | 4篇 |
2007年 | 9篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 5篇 |
2002年 | 5篇 |
2001年 | 2篇 |
2000年 | 5篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1982年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有111条查询结果,搜索用时 31 毫秒
31.
Arkhipova D. M. Ermolaev V. V. Milyukov V. A. Valeeva F. G. Gaynanova G. A. Zakharova L. Ya. 《Russian Chemical Bulletin》2022,71(4):804-811
Russian Chemical Bulletin - Self-aggregation processes in an H2O—DMF (10%) medium were studied for a homologous series of tri-tert-butyl(n-alkyl)phosphonium tetrafluoroborates (PIL-n, where n... 相似文献
32.
33.
A. I. Litvinov F. G. Valeeva L. Ya. Zakharova S. E. Solovieva I. S. Antipin M. K. Kadirov 《Russian Chemical Bulletin》2013,62(6):1350-1353
The critical micelle formation concentrations of oxyethylated calixarenes 9CO8 and 9CO16 were determined by the spin probe ESR method. A decrease in the current passing through the system was revealed during the electrochemical oxidation of the probe in the presence of 9CO8. The current decrease depends on the amphiphile concentration and is due to the fact that the surface of micellar and pre-micellar aggregates impedes the access of charged particles to the probe. The pre-micellar aggregation phase was found by ESR and electrochemistry of spin probes. The concentrations of amphiphilic substances, at which structural rearrangements for pre-micellar aggregation are observed, were elucidated. 相似文献
34.
Ludmila V Roze Anindya Chanda Maris Laivenieks Randolph M Beaudry Katherine A Artymovich Anna V Koptina Deena W Awad Dina Valeeva Arthur D Jones John E Linz 《BMC biochemistry》2010,11(1):33
Background
Filamentous fungi in the genus Aspergillus produce a variety of natural products, including aflatoxin, the most potent naturally occurring carcinogen known. Aflatoxin biosynthesis, one of the most highly characterized secondary metabolic pathways, offers a model system to study secondary metabolism in eukaryotes. To control or customize biosynthesis of natural products we must understand how secondary metabolism integrates into the overall cellular metabolic network. By applying a metabolomics approach we analyzed volatile compounds synthesized by Aspergillus parasiticus in an attempt to define the association of secondary metabolism with other metabolic and cellular processes. 相似文献35.
M. A. Voronin F. G. Valeeva L. Ya. Zakharova R. Kh. Giniyatullin V. E. Semenov V. S. Reznik 《Kinetics and Catalysis》2010,51(5):644-652
The aggregation and catalytic activity of supramolecular systems based on new macrocyclic dimeric surfactants (pyrimidinophanes)
was studied both in the absence and in the presence of polyethyleneimine (PEI). It was found that the critical micelle concentrations
measured by tensiometry were independent of the structure of surfactants. The morphology of aggregates was responsible for
various characters of the catalytic effects of pyrimidinophanes in the hydrolysis of phosphonic acid esters. A less hydrophobic
pyrimidinophane exhibited a typical effect of cationic surfactants to accelerate the reaction both in the absence and in the
presence of PEI. Unlike cationic micelles, a heminal-type pyrimidinophane exhibited an anomalous behavior: it had no effect
on the rates of hydrolysis of the substrates and did not inhibit the hydrolysis. Upon the addition of lanthanum ions, the
catalytic activity of dimeric surfactants increased. The overall catalytic effect due to the action of supramolecular systems
based on pyrimidinophanes, PEI, and lanthanum ions can increase the rates of hydrolysis of the substrates by three orders
of magnitude, as compared with that of alkaline hydrolysis. 相似文献
36.
Yu. R. Ablakova A. B. Mirgorodskaya L. Ya. Zakharova F. G. Valeeva 《Russian Chemical Bulletin》2010,59(4):784-789
The micellization properties, solubilization capability, and catalytic effect of conventional nonionic surfactants and amphiphilic
compounds of oligomeric (Tyloxapol) and polymeric (Synperonic F-68, Pluronic F-127) structure were compared. The systems studied
demonstrate a marked catalytic effect toward basic hydrolysis of p-nitrophenyl laurate, which exceeds the effect of aqueous alkali solutions by two orders of magnitude. Correlations between
the solubilization capacity of aggregates and their catalytic effect were observed. The maximum efficiency was found for the
Tyloxapol solution. The synergetic enhancement of the catalytic effect was observed for the mixed Tyloxapol-cetyltrimethylammonium
bromide systems in the presence of small amounts of cationic surfactant 相似文献
37.
38.
Zakharova L. Ya. Kudryavtsev D. B. Valeeva F. G. Kudryavtseva L. A. 《Russian Journal of General Chemistry》2002,72(8):1215-1221
The rate of alkaline hydrolysis of ethyl p-nitrophenyl (chloromethyl)phosphonate in micellar solutions of cationic surfactants decreases with increasing concentration of chloride, bromide, and salicylate ions. In the presence of electrolytes, the critical micell concentration of surfactants and the surface potential of micelles also decrease. 相似文献
39.
L. Ya. Zakharova A. R. Mustafina F. G. Valeeva A. R. Ibragimova Yu. R. Ablakova Yu. G. Elistratova V. V. Syakaev L. A. Kudryavtseva A. I. Konovalov 《Colloid Journal》2008,70(4):444-454
The aggregation and catalytic effect in the reaction of hydrolytic decomposition of phosphorous acid esters are studied for
series of systems such as calixarene (CA)-sodium dodecyl sulfate (SDS), CA-poly(ethylene imine) (PEI), SDS-PEI, and CA-SDS-PEI.
Using dynamic light scattering, sizes of aggregates are determined, cloud point is estimated, and catalytic effect is studied.
Data obtained are consistent with the assumption of the joint aggregation in systems studied. The possibility of the passage
from 20-fold inhibiting effect to the catalysis (higher than the order of magnitude) of studied reaction by the immobilization
of anionic nanoaggregates (nanoreactors) on a catalytically active polymer matrix is demonstrated. The possibility of the
passage from microheterogeneous to heterogeneous system and the separation of catalyst from the products are established. 相似文献
40.
The structure of annealed titanium monoxide TiO1.087 containing monoclinic ordered phase Ti5O5 was studied by electron diffraction. Along with the set of structural, superstructural, and extra reflections, the diffraction pattern of titanium monoxide shows a set of plane diffuse fringes in the (112)B1* section of the reciprocal lattice of the basis cubic structure B1. It is shown that some of the extra reflections are due to the twinning of the monoclinic superstructure along the (?1?11) plane of the reciprocal lattice of the basis cubic structure. The diffuse contours enclose plane areas of the reciprocal space with the fixed values of wave vectors K100 ~ ±(h+0.07)k100, K010 ~ ±(k+0.07)k010, and K001 ~± (l+0.07)k001 of the B1 structure. Their appearance is associated with the short-range displacement order. 相似文献