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排序方式: 共有124条查询结果,搜索用时 31 毫秒
21.
Sergey Belyakov Edgars Alksnis Velta Muravenko Edmunds Lukevics 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(1):o63-o64
The title compound, C14H11Cl3N4O2, consists of two planar fragments which are nearly perpendicular to one another. The crystal packing is controlled by intra‐ and intermolecular C—H·O hydrogen bonds, and Cl·phenyl‐ring‐centroid and weak stacking interactions. 相似文献
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以(R)/(S)-4-苄基-2-噁唑烷酮为手性助剂,采用不对称合成方法制备了18个具有光学活性的2-甲氧羰基-4-氟苯基-1,5-苯并硫氮杂卓类化合物9a~9i和14a~14i,经HPLC分析e.e.值较为理想;通过核磁共振谱、红外光谱和高分辨质谱表征了其结构,通过单晶X射线衍射法确定化合物9h的相对构型;用抑菌圈法测试了目标化合物对新生隐球菌的抑菌活性.研究结果表明,由S型手性助剂诱导不对称合成的杂卓对新生隐球菌的抑制作用普遍高于由R型手性助剂诱导合成的杂卓及外消旋体.测试了抑菌活性较好的化合物14a~14f的最小抑菌浓度(MIC)和最小杀菌浓度(MFC),发现其对新生隐球菌的MIC和MFC均低于抗真菌药物氟康唑. 相似文献
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Selective Cell Adhesion and Biosensing Applications of Bio‐Active Block Copolymers Prepared by CuAAC/Thiol‐ene Double Click Reactions
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Sevinc Tuncagil Dilek Odaci Serhat Varis Suna Timur Levent Toppare 《Bioelectrochemistry (Amsterdam, Netherlands)》2009,76(1-2):169
Two types of bacterial biosensor were constructed by immobilization of Gluconobacter oxydans and Pseudomonas fluorescens cells on graphite electrodes modified with the conducting polymer; poly(1-(4-nitrophenyl)-2,5-di(2-thienyl)-1 H-pyrrole) [SNS(NO2)]. The measurement was based on the respiratory activity of cells estimated by the oxygen consumption at − 0.7 V due to the metabolic activity in the presence of substrate. As well as analytical characterization, the linear detection ranges, effects of electropolymerization time, pH and cell amount were examined by using glucose as the substrate. The linear relationships were observed in the range of 0.25–4.0 mM and 0.2–1.0 mM for G. oxydans and P. fluorescens based sensors, respectively. 相似文献
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Suna Wang Dacheng Li Jianmin Dou Daqi Wang 《Acta Crystallographica. Section C, Structural Chemistry》2010,66(4):m118-m121
In the title coordination compound, catena‐poly[[[bis[diaquacadmium(II)]‐μ2‐trans‐1,2‐bis(4‐pyridyl)ethene]bis{μ2‐2,2′‐[(5‐carboxymethoxy‐m‐phenylene)dioxy]diacetato}] trans‐1,2‐bis(4‐pyridyl)ethene solvate dihydrate], {[Cd2(C12H10O9)2(C12H10N2)(H2O)4]·C12H10N2·2H2O}n, (I), each CdII centre adopts a pentagonal–bipyramidal coordination geometry. The incompletely deprotonated 2,2′‐[(5‐carboxymethoxy‐m‐phenylene)dioxy]diacetate (TCMB) ligands and trans‐1,2‐bis(4‐pyridyl)ethene (bpe) ligands both act as bidentate bridges, linking the CdII centres into one‐dimensional ladders, which are connected into an undulating two‐dimensional (6,3) layer through O—H...N hydrogen bonds between the carboxylate groups of the TCMB ligands and the N atoms of the uncoordinated bpe ligands. Each undulating layer polycatenates two other identical layers, exhibiting the unusual combination of both 2D → 2D parallel and 2D → 3D parallel interpenetration (2D and 3D are two‐ and three‐dimensional, respectively). 相似文献
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Zinc porphyrin-appended dendrimers, 12PZn, 18PZn, 24PZn, and 36PZn, containing 12, 18, 24, and 36 zinc porphyrin units, respectively, were synthesized using zinc porphyrin dyad (2PZn) and triad (3PZn) as precursors. Although these dye-functionalized dendrimers all serve as chiroptical sensors for an asymmetric bipyridine (RR- and SS-Py2), the sensing capability is highly dependent on the structure of the dendritic scaffold. 2PZn, which is chiroptically silent toward Py2, turns cooperative and displays a large ICD (induced circular dichroism) response in the visible region when incorporated into 12PZn. Judging from the extents of contribution of each zinc porphyrin unit to the CD amplitudes ([Deltaepsilonmax]), the cooperativity in 24PZn (112 M-1 cm-1) is lower than that in 12PZn (196 M-1 cm-1) and much lower in dendron 4PZn (59 M-1 cm-1). In contrast, 3PZn, which is ICD-active toward Py2, hardly shows such an enhanced cooperativity when incorporated into 18PZn and 36PZn and dendron 6PZn, as well. Absorption spectroscopy suggests some unique conformational characteristics of the zinc porphyrin units in highly cooperative 12PZn. 相似文献
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Shao Yong Li Bei Sun Zhi Chao Xiao Ming Hui Huang Wei Xue Xie Jun Min Liu 《中国化学快报》2009,20(6):640-642
A one-step procedure is developed to synthesize inherently chiral p-tert-butylcalix[4]azacrown 1 through etherification between p-tert-butylcalix[4]arene and compound 3, which can be amplified to efficiently prepare more inherently chiral calix[4]arenes in ABHH substitution pattern. 相似文献
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