全文获取类型
收费全文 | 166篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
化学 | 120篇 |
晶体学 | 4篇 |
力学 | 2篇 |
数学 | 1篇 |
物理学 | 41篇 |
出版年
2022年 | 10篇 |
2021年 | 8篇 |
2020年 | 8篇 |
2019年 | 20篇 |
2018年 | 7篇 |
2017年 | 14篇 |
2016年 | 2篇 |
2015年 | 4篇 |
2014年 | 4篇 |
2013年 | 14篇 |
2012年 | 6篇 |
2011年 | 9篇 |
2010年 | 2篇 |
2009年 | 5篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 7篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1971年 | 1篇 |
1968年 | 2篇 |
排序方式: 共有168条查询结果,搜索用时 15 毫秒
31.
A local Frédericksz transition caused by electrically controlled surface anchoring in a nematic liquid crystal has been implemented owing to the displacement of surface-active ions. In the initial case, the nematic is homeotropically aligned by monomolecular layers of cetyltrimethylammonium bromide cations adsorbed on the surface of substrates. One of the substrates in a static electric field becomes free of a cation layer and specifies planar boundary conditions; as a result, a homeoplanar orientation structure is formed. The features of the dynamics of the optical response of the cell under study that are characteristic of the effect under consideration are discussed. 相似文献
32.
The transformation of the director configuration upon changing boundary conditions from planar to homeotropic for bipolar nematic droplets dispersed in a polymeric matrix was studied. The characteristic textural patterns are presented for droplets with different concentrations of homeotropic surfactants, and their orientational structure is identified. The scenario predicted earlier by G.E. Volovik and O.D. Lavrentovich (ZhETF 85, 1997 (1983)) for the transformation of orientational structure of nematic droplets from bipolar to radial, without the formation of additional disclinations, is revealed. It is shown that, by using the computational method of minimization of the director elastic-strain energy in the droplet bulk and by introducing the inhomogeneous boundary conditions, one can obtain orientational structures that are analogous to the observed ones. 相似文献
33.
Kopchuk D. S. Krinochkin A. P. Starnovskaya E. S. Shtaitz Ya. K. Kovalev I. S. Zyryanov G. V. Rusinov V. L. Chupakhin O. N. 《Russian Journal of Organic Chemistry》2018,54(3):509-511
Russian Journal of Organic Chemistry - The possibility of substitution of the 5-cyano group in 1,2,4-triazines by carbohydrazide residues under solvent-free conditions with high yields has been... 相似文献
34.
Shabunina O. V. Krinochkin A. P. Kopchuk D. S. Zyryanov G. V. Rusinov V. L. Chupakhin O. N. 《Russian Journal of Organic Chemistry》2018,54(5):812-814
Russian Journal of Organic Chemistry - Convenient one-pot method was developed for the preparation of 5-alkyl-3-(2-pyridyl)-, 5-alkyl-3-(4-pyridyl)- or 5-alkyl-3-(quinolin-2-yl)-1,2,4-triazines in... 相似文献
35.
3-Aryl-1,2,4-triazin-5(4H)-ones, in the presence of N-protected amino acids, react with C-nucleophiles to form 1-acyl-6-Nu-3-aryl-1,6-dihydro-1,2,4-triazin-5(4H)-ones in high diastereomeric excess. This is the first case of the use of amino acids as chiral auxiliaries in nucleophilic additions to triazinones. 相似文献
36.
V. L. Rusinov T. V. Dragunova V. A. Zyryanov G. G. Aleksandrov O. N. Chupakhin 《Chemistry of Heterocyclic Compounds》1986,22(12):1350-1354
Condensation of tetrazolylhydrazone of ethyl nitroglyoxalate with aromatic amines gives rise to derivatives of 5-arylamino-6-oxo-6,7-dihydrotetrazolo[5,1-b][1,2,4]triazine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1668–1672, December 1986. 相似文献
37.
Baikalova L. V. Zyryanov I. A. Afonin A. V. Trofimov B. A. 《Russian Journal of Organic Chemistry》2002,38(11):1674-1680
Condensation of 2-, 3-aminopyridines and 2-aminopyrimidine with 1-vinyl- and 1-ethylimidazole-2-carbaldehydes and 1-vinyl-, 1-ethylbenzimidazole-2-carbaldehydes takes two paths depending on the reagents structure: either form Schiff bases or aminals of the corresponding heterocyclic carbaldehydes. 相似文献
38.
Nataliya V. Slovesnova Artem S. Minin Anna V. Belousova Aleksey A. Ustyugov Kirill D. Chaprov Alexey P. Krinochkin Maria I. Valieva Yaroslav K. Shtaitz Ekaterina S. Starnovskaya Igor L. Nikonov Anton N. Tsmokalyuk Grigory A. Kim Sougata Santra Dmitry S. Kopchuk Emiliya V. Nosova Grigory V. Zyryanov 《Molecules (Basel, Switzerland)》2022,27(23)
Linked to Alzheimer’s disease (AD), amyloids and tau-protein are known to contain a large number of cysteine (Cys) residues. In addition, certain levels of some common biogenic thiols (cysteine (Cys), homocysteine (Hcy), glutathione (GSH), etc.) in biological fluids are closely related to AD as well as other diseases. Therefore, probes with a selective interaction with the above-mentioned thiols can be used for the monitoring and visualizing changes of (bio)thiols in the biological fluids as well as in the brain of animal models of Alzheimer’s disease. In this study, new Eu(III), Tb(III), Gd(III) and Sm(III) complexes of 2,2′-bipyridine ligands containing TEMPO fragments as receptor units for (bio)thiols are reported. The presence of free radical fragments of the ligand in the complexes was proved by using the electronic paramagnetic resonance (EPR) method. Among all the complexes, the Eu(III) complex turned out to be the most promising one as luminescence- and spin-probe for the detection of biogenic thiols. The EPR and fluorescent titration methods showed the interaction of the resulting complex with free Cys and GSH in solution. To study the practical applicability of the probes for the monitoring of AD in-vivo, by using the above-mentioned Eu(III)-based probe, the staining of the brain of mice with amyloidosis and Vero cell cultures supplemented with the cysteine-enriched medium was studied as well as the fluorescence titration of Bovine Serum Albumin, BSA (as the model for the thiol moieties containing protein), was carried out. Based on the results of fluorescence titration, the formation of a non-covalent inclusion complex between the above-mentioned Eu(III) complex and BSA was suggested. 相似文献
39.
40.
Ekaterina S. Starnovskaya Dmitry S. Kopchuk Albert F. Khasanov Olga S. Taniya Igor L. Nikonov Maria I. Valieva Dmitry E. Pavlyuk Alexander S. Novikov Grigory V. Zyryanov Oleg N. Chupakhin 《Molecules (Basel, Switzerland)》2022,27(20)
A series of new α-(N-biphenyl)-substituted 2,2′-bipyridines were obtained through the combination of the ipso-nucleophilic aromatic substitution of the C5-cyano group, aza-Diels–Alder and Suzuki cross-coupling reactions, starting from 5-cyano-1,2,4-triazines. For the obtained compounds, photophysical and fluorosolvatochromic properties were studied. Fluorophores 3l and 3b demonstrated unexpected AIEE activity, while 3a and 3h showed promising nitroexplosive detection abilities. 相似文献