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排序方式: 共有222条查询结果,搜索用时 15 毫秒
151.
152.
T. -S. Balaban A. T. Balaban D. E. Daia K. M. Turdybekov S. V. Lindeman Yu. T. Struchkov 《Structural chemistry》1992,3(3):191-194
The molecular structure of the title compound indicates that it possesses a transoid structure of the O=C-C-O group, and a dihedral angle of about 40° between the furan and phenyl rings. The same conformation is predominant also in CDCl3 solution as indicated by europium chelate induced proton shifts. The corresponding 2,4-dinitrophenyhydrazone has, however, the cisoid isomer stabilized by an intramolecular hydrogen bond. 相似文献
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154.
Dipole moments were determined for the chelates 2-6 of benzodioxaborole or diphenylborinic acid with tropolone derivatives or with 1,3-diketones (acetylacetone, dibenzoylmethane). Correlations with the structure were attempted. 相似文献
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Structural factors influencing the reaction rates of 4-aryloxy-7-nitrobenzofurazans with amino acids
Marioara Bem Marilena Vasilescu Miron T. Caproiu Constantin Draghici Adrian Beteringhe Titus Constantinescu Mircea D. Banciu Alexandru T. Balaban 《Central European Journal of Chemistry》2004,2(4):672-685
An interesting observation was made when studying the S
N
Ar reaction between several 4-aryloxy-7-nitrobenzofurazans (2) and several amino acids leading to the apparition of detectable fluorescence from the substitution products3. Acidic amino acids reacted very slowly=while basic amino acids react fastest with2 having an unsubstituted phenyl or a 4-formyl-phenyl Ar group. Amongst neutral amino acids, proline reacts fastest at room
temperature after 100 min. With2 having a methoxy-subtituted Ar group. 相似文献
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Chappaz-Gillot C Marek PL Blaive BJ Canard G Bürck J Garab G Hahn H Jávorfi T Kelemen L Krupke R Mössinger D Ormos P Reddy CM Roussel C Steinbach G Szabó M Ulrich AS Vanthuyne N Vijayaraghavan A Zupcanova A Balaban TS 《Journal of the American Chemical Society》2012,134(2):944-954
Being able to control in time and space the positioning, orientation, movement, and sense of rotation of nano- to microscale objects is currently an active research area in nanoscience, having diverse nanotechnological applications. In this paper, we demonstrate unprecedented control and maneuvering of rod-shaped or tubular nanostructures with high aspect ratios which are formed by self-assembling synthetic porphyrins. The self-assembly algorithm, encoded by appended chemical-recognition groups on the periphery of these porphyrins, is the same as the one operating for chlorosomal bacteriochlorophylls (BChl's). Chlorosomes, rod-shaped organelles with relatively long-range molecular order, are the most efficient naturally occurring light-harvesting systems. They are used by green photosynthetic bacteria to trap visible and infrared light of minute intensities even at great depths, e.g., 100 m below water surface or in volcanic vents in the absence of solar radiation. In contrast to most other natural light-harvesting systems, the chlorosomal antennae are devoid of a protein scaffold to orient the BChl's; thus, they are an attractive goal for mimicry by synthetic chemists, who are able to engineer more robust chromophores to self-assemble. Functional devices with environmentally friendly chromophores-which should be able to act as photosensitizers within hybrid solar cells, leading to high photon-to-current conversion efficiencies even under low illumination conditions-have yet to be fabricated. The orderly manner in which the BChl's and their synthetic counterparts self-assemble imparts strong diamagnetic and optical anisotropies and flow/shear characteristics to their nanostructured assemblies, allowing them to be manipulated by electrical, magnetic, or tribomechanical forces. 相似文献
160.
Fatma Hamurcu Ayla Balaban Gündüzalp Servet ?ete Birgül Erk 《Transition Metal Chemistry》2008,33(1):137-141
Metal complexes derived from amides; N,N′-bis(2-thiophenecarboxamido)-1,3-diamino propane (1) and N,N′-bis(2-furancarboxamido)-1,3-diaminopropane (2) were characterized by elemental analysis, spectral (NMR, FT-IR, LC-MS) methods, magnetic moment, molar conductance, and TGA/DTA
studies. The complexes were dimeric and have the general formula [ML.Clm.(H2O)n]2Cl2 where M=Cu(II), Zn(II), Co(III); m = 1, 2; n = 0, 1. The antimicrobial activities of the amides and their complexes were studied against the bacteria; Escherichia coli (ATCC 11230), Yersinia enterocolitica (ATCC 1501), Bacillus magaterium (RSKK 5117), Bacillus cereus (RSKK 863), Bacillus subtilis (RSKK 863) and yeast; Candida albicans (ATCC 10239). 相似文献