首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   108篇
  免费   2篇
化学   78篇
晶体学   1篇
力学   3篇
数学   6篇
物理学   22篇
  2023年   1篇
  2022年   5篇
  2021年   2篇
  2020年   4篇
  2019年   3篇
  2018年   12篇
  2017年   9篇
  2016年   13篇
  2015年   1篇
  2014年   2篇
  2013年   5篇
  2012年   1篇
  2011年   4篇
  2010年   5篇
  2009年   4篇
  2008年   6篇
  2007年   4篇
  2006年   2篇
  2002年   1篇
  2000年   2篇
  1997年   1篇
  1996年   1篇
  1995年   1篇
  1994年   2篇
  1990年   3篇
  1989年   1篇
  1985年   2篇
  1984年   1篇
  1979年   1篇
  1978年   1篇
  1976年   1篇
  1974年   4篇
  1970年   2篇
  1967年   3篇
排序方式: 共有110条查询结果,搜索用时 15 毫秒
71.
A scheme was developed to explain the transformation of phase diagrams for KBr–oxyethylated surfactant–water systems in response to varying temperature. This scheme was shown to correspond with the respective scheme for salt–binary solvent systems. The surfactant structure was shown to have an effect on the temperature ranges of existence of a liquid–liquid two-phase equilibrium field and the positions of critical points. The elucidated trends serve as the basis for selecting components and optimizing parameters of surfactant- involving extraction processes.  相似文献   
72.
Variational methods are applied to give approximate solutions for the temperature distribution in a right equilateral triangular prism.  相似文献   
73.
Reverse micelles system is suggested as a direct tool to study the influence of membrane matrix composition on the activity and structure of membrane-associated enzymes with the use of acid phosphatase (AP) as an example. In reverse micelles the functioning of the monomeric and dimeric forms of AP could be separately observed by variation of the size of the micelles. We found that including the lipids into the micellar system can dramatically affect the enzyme functioning even at low lipid content (2% w/w), and this effect depends on the lipid nature. Structural studies using CD spectroscopy and DLS methods have shown that the influence of lipid composition on the enzyme properties might be caused by the interaction of lipids with the enzyme as well as by the influence of lipids on structure and properties of the micellar matrix.  相似文献   
74.
75.
76.
Conclusions (2S,5S)-Dimethoxyadipic acid was synthesized from the D-mannitol derivative.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2151–2153, September, 1974.  相似文献   
77.
78.
Measurements have been made of the absorption of EHF radiation ( 5 cm–1) by aqueous solutions of urea at 20–70°C, over the entire interval of urea solubility. Excess absorption has been found in comparison with the additive magnitude, and this has been attributed to an increase in the fraction of water molecules in the solution with rotational degrees of freedom. A model has been proposed for the hydration of urea, based on the concept of inhomogeneity of the hydrate shell of urea: stabilization of the structure of water under the influence of carbonyl oxygen and Hcis atoms (positive hydration) and a simultaneous breakdown of the structure of water in the region of two Htrans atoms that have approached to a distance of 2.14 » (negative hydration).For Previous Communication, See [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 314–320, February, 1990.  相似文献   
79.
Lytic enzymes of bacteriophages K, phi11, and phi80α can lyse (destroy) cells of antibiotic-resistant strains of Staphylococcus aureus, which makes these enzymes promising antimicrobial agents. The stability of recombinant lysins of phages K, phi11, and phi80α was investigated under the conditions of storage and functioning, and the correlation between the stability and the secondary structure of the enzymes was found. It has been shown that the lower the content of disordered structures in the enzyme molecules, the greater the stability (half-inactivation time) of the lysins. At the storage temperature, the beta-structural lysin of phage phi11 shows the highest stability, while the phage K lysin with an alpha-helical structure and the phi80α lysin with a disordered secondary structure are less stable.  相似文献   
80.
The effect the salting-out agent anion nature has on the temperature and concentration intervals of the existence of the separation area is established by analyzing the phase diagrams of pseudoternary KCl (KBr, KI, KNO3, K2SO4, K4P2O7)–potassium bis(alkyl polyoxyethylene)phosphate (oxyphos B)–water systems. It is concluded that the anionic salting-out capability is reduced in the order P2O74-> SO42-> Cl? > Br?> NO74-> SO3-> I?. The thermodynamic parameters of phase separation used to interpret the results are calculated. The observed pattern of a change in the salting-out ability of the investigated salts relative to aqueous solutions of the surfactants is in good agreement with the lyotropic (Hofmeister) series.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号