全文获取类型
收费全文 | 103篇 |
免费 | 5篇 |
专业分类
化学 | 77篇 |
力学 | 5篇 |
数学 | 10篇 |
物理学 | 16篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 10篇 |
2015年 | 6篇 |
2014年 | 3篇 |
2013年 | 6篇 |
2012年 | 6篇 |
2011年 | 6篇 |
2010年 | 7篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 5篇 |
2006年 | 6篇 |
2005年 | 5篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 5篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1996年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1980年 | 2篇 |
排序方式: 共有108条查询结果,搜索用时 15 毫秒
31.
Piero Dalla Croce Concetta La Rosa Riccardo Stradi Marzia Ballabio 《Journal of heterocyclic chemistry》1983,20(3):519-521
C,N-Diphenyl nitrones react with substituted α,β-unsaturated phenylsulfones yielding isoxazolidinic cycloadducts whose structure and stereochemistry were assigned on the basis of 1H and 13C nmr data. The ycloaddition regioselectivity is discussed in accordance with frontier orbital considerations. 相似文献
32.
Engaging Copper(III) Corrole as an Electron Acceptor: Photoinduced Charge Separation in Zinc Porphyrin–Copper Corrole Donor–Acceptor Conjugates
下载免费PDF全文
![点击此处可从《Chemistry (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Dr. Thien H. Ngo David Zieba Whitney A. Webre Gary N. Lim Prof. Dr. Paul A. Karr Scheghajegh Kord Dr. Shangbin Jin Dr. Katsuhiko Ariga Marzia Galli Prof. Dr. Steve Goldup Dr. Jonathan P. Hill Prof. Dr. Francis D'Souza 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(4):1301-1312
An electron‐deficient copper(III) corrole was utilized for the construction of donor–acceptor conjugates with zinc(II) porphyrin (ZnP) as a singlet excited state electron donor, and the occurrence of photoinduced charge separation was demonstrated by using transient pump–probe spectroscopic techniques. In these conjugates, the number of copper corrole units was varied from 1 to 2 or 4 units while maintaining a single ZnP entity to observe the effect of corrole multiplicity in facilitating the charge‐separation process. The conjugates and control compounds were electrochemically and spectroelectrochemically characterized. Computational studies revealed ground state geometries of the compounds and the electron‐deficient nature of the copper(III) corrole. An energy level diagram was established to predict the photochemical events by using optical, emission, electrochemical, and computational data. The occurrence of charge separation from singlet excited zinc porphyrin and charge recombination to yield directly the ground state species were evident from the diagram. Femtosecond transient absorption spectroscopy studies provided spectral evidence of charge separation in the form of the zinc porphyrin radical cation and copper(II) corrole species as products. Rates of charge separation in the conjugates were found to be of the order of 1010 s?1 and increased with increasing multiplicity of copper(III) corrole entities. The present study demonstrates the importance of copper(III) corrole as an electron acceptor in building model photosynthetic systems. 相似文献
33.
Marzia Bisi Fiammetta Conforto Giorgio Martalò 《Continuum Mechanics and Thermodynamics》2016,28(5):1295-1324
The shock structure problem for Grad 10-moment equations for an inert binary mixture is investigated: necessary conditions for the formation of sub-shocks in fields of only one gas or of both components are rigorously obtained, and a detailed comparison with the shock-wave structure of its principal sub-system (deduced assuming vanishing viscous stress tensors) and of the equilibrium Euler sub-system is performed. Some numerical simulations for a mixture of argon and helium are presented. 相似文献
34.
35.
A multi-temperature hydrodynamic limit of kinetic equations is employed for the analysis of the steady shock problem in a binary mixture. Numerical results for varying parameters indicate possible occurrence of either smooth profiles or of weak solutions with one or two discontinuities. 相似文献
36.
Alice M Proverbio Valentina Brignone Silvia Matarazzo Marzia Del Zotto Alberto Zani 《BMC neuroscience》2006,7(1):44-10
Background
Current cognitive neuroscience models predict a right-hemispheric dominance for face processing in humans. However, neuroimaging and electromagnetic data in the literature provide conflicting evidence of a right-sided brain asymmetry for decoding the structural properties of faces. The purpose of this study was to investigate whether this inconsistency might be due to gender differences in hemispheric asymmetry. 相似文献37.
Marzia Ballbio Stefano Del Nero Aristide Vigevani 《Magnetic resonance in chemistry : MRC》1980,14(6):538-539
Several analogues of quinoline-8-carboxamide were examined by 1H NMR and IR in order to establish structural requirements for strong intramolecular hydrogen bonding. 相似文献
38.
Antonino Scurria Marzia Sciortino Alessandro Presentato Claudia Lino Elena Piacenza Lorenzo Albanese Federica Zabini Francesco Meneguzzo Domenico Nuzzo Mario Pagliaro Delia Francesca Chillura Martino Rosa Alduina Giuseppe Avellone Rosaria Ciriminna 《Molecules (Basel, Switzerland)》2021,26(1)
An HS-SPME GC-MS analysis of the volatile compounds adsorbed at the outer surface of lemon and grapefruit pectins obtained via the hydrodynamic cavitation of industrial waste streams of lemon and grapefruit peels in water suggests important new findings en route to understanding the powerful and broad biological activity of these new pectic materials. In agreement with the ultralow degree of esterification of these pectins, the high amount of highly bioactive α-terpineol and terpinen-4-ol points to limonene (and linalool) decomposition catalyzed by residual citric acid in the citrus waste peel residue of the juice industrial production. 相似文献
39.
Vibhu Jha Marzia Biagi Valeria Spinelli Miriana Di Stefano Marco Macchia Filippo Minutolo Carlotta Granchi Giulio Poli Tiziano Tuccinardi 《Molecules (Basel, Switzerland)》2021,26(1)
Monoacylglycerol lipase (MAGL) is an important enzyme of the endocannabinoid system that catalyzes the degradation of the major endocannabinoid 2-arachidonoylglycerol (2-AG). MAGL is associated with pathological conditions such as pain, inflammation and neurodegenerative diseases like Parkinson’s and Alzheimer’s disease. Furthermore, elevated levels of MAGL have been found in aggressive breast, ovarian and melanoma cancer cells. Due to its different potential therapeutic implications, MAGL is considered as a promising target for drug design and the discovery of novel small-molecule MAGL inhibitors is of great interest in the medicinal chemistry field. In this context, we developed a pharmacophore-based virtual screening protocol combined with molecular docking and molecular dynamics simulations, which showed a final hit rate of 50% validating the reliability of the in silico workflow and led to the identification of two promising and structurally different reversible MAGL inhibitors, VS1 and VS2. These ligands represent a valuable starting point for structure-based hit-optimization studies aimed at identifying new potent MAGL inhibitors. 相似文献
40.