全文获取类型
收费全文 | 55篇 |
免费 | 3篇 |
专业分类
化学 | 49篇 |
数学 | 6篇 |
物理学 | 3篇 |
出版年
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 4篇 |
2016年 | 1篇 |
2014年 | 1篇 |
2013年 | 6篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2010年 | 6篇 |
2009年 | 4篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2000年 | 1篇 |
1994年 | 1篇 |
1990年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1975年 | 2篇 |
1973年 | 1篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1935年 | 1篇 |
1933年 | 1篇 |
排序方式: 共有58条查询结果,搜索用时 31 毫秒
1.
2.
Madeline J. Simpson Horacio Poblete May Griffith Emilio I. Alarcon Juan C. Scaiano 《Photochemistry and photobiology》2013,89(6):1433-1441
The role of recombinant Type‐I human collagen in the free form or forming AgNP@collagen on the photophysical and photochemical behavior of rose Bengal was analyzed. The formation of dye aggregates on the protein surface was experimentally observed and corroborated by docking calculations. The formation of such aggregates is believed to change the main oxidative mechanism from Type‐II (singlet oxygen) to Type‐I (free radical) photosensitization. Remarkably, the presence of AgNP in the form of AgNP@collagen altered the dynamics of dye triplet deactivation, effectively preventing the dye degradation and reducing the extent of protein crosslinked. Both crosslinked rHC and AgNP@collagen were able to support fibroblasts proliferation, but only the material containing silver was resistant to S. epidermidis infection. 相似文献
3.
4.
5.
This article demonstrates that it is not always beneficial to exfoliate graphitic structures to single-layer graphene to achieve maximum electrochemical performance. Using electrochemical impedance spectroscopy, we show that multilayer graphene nanoribbons with cross sections of 100 × 100 nm provide larger capacitance (15.6 F/g) than do few-layer graphene nanoribbons (14.9 F/g) and far larger capacitance than single-layer graphene nanoribbons (10.9 F/g) with the same cross section. 相似文献
6.
7.
Bromolactonization of 4-hexenoic acids gives a greater percentage of δ-lactones than does iodolactonization. Substituents in the 3-position favor the formation of δ-lactones while substituents in the 6-position favor the formation of γ-lactones. 相似文献
8.
Electrophilic additions involving fluoronium ions. I. Fluoroxy additions to perfluoro-olefinic bonds
The fluoroxy addition of perfluoro-t-butyl hypofluorite to hexafluoro-propene leads predominantly (> 95%) to perfluoro-n-propyl perfluoro-t-butyl ether. The unique structural orientation of this perfluoro-n-propyl product is of interest because the products of fluoride ion addition reactions have previously been reported as perfluoroisopropyl derivatives. The results obtained in this study provide a simple experimental demonstration of electrophilic attack by the O-F group, leading to the addition of the fluoronium ion to the more nucleophilic unsaturated carbon atom.The same mechanism as for a perfluoro-α-olefin applies in fluoroxy addition to a perfluorovinyl ether. The perfluoro-t-butoxy group also adds predominantly (> 95%) to the terminal unsaturated carbon atom. 相似文献
9.
DNA release electrochemically stimulated by applying ?10 mV on the modified electrode was studied. The release process was based on the local (interfacial) pH change produced upon H2O2 reduction electrocatalyzed by the immobilized microperoxidase‐11. SiO2 nanoparticles attached to the electrode surface and functionalized with trigonelline and boronic acid species changed their electrical charge from positive to negative upon the interfacial pH change, thus allowing electrostatic adsorption of negatively charged DNA on the positive interface and then its repulsion/release from the negative interface. The loaded/released DNA molecules were labeled with a fluorescent dye to allow easy detection of the released DNA molecules. The important feature of the developed system is the controlled DNA release upon applying very small electrical potential on the modified electrode. 相似文献
10.
Minkyu Kim Moon Jong Han Hansol Lee Paraskevi Flouda Daria Bukharina Kellina J. Pierce Katarina M. Adstedt Madeline L. Buxton Young Hee Yoon William T. Heller Srikanth Singamaneni Vladimir V. Tsukruk 《Angewandte Chemie (International ed. in English)》2023,62(30):e202305646
Chiral metal–organic frameworks (MOFs) have gained rising attention as ordered nanoporous materials for enantiomer separations, chiral catalysis, and sensing. Among those, chiral MOFs are generally obtained through complex synthetic routes by using a limited choice of reactive chiral organic precursors as the primary linkers or auxiliary ligands. Here, we report a template-controlled synthesis of chiral MOFs from achiral precursors grown on chiral nematic cellulose-derived nanostructured bio-templates. We demonstrate that chiral MOFs, specifically, zeolitic imidazolate framework (ZIF), unc -[Zn(2-MeIm)2, 2-MeIm=2-methylimidazole], can be grown from regular precursors within nanoporous organized chiral nematic nanocelluloses via directed assembly on twisted bundles of cellulose nanocrystals. The template-grown chiral ZIF possesses tetragonal crystal structure with chiral space group of P41, which is different from traditional cubic crystal structure of I-43 m for freely grown conventional ZIF-8. The uniaxially compressed dimensions of the unit cell of templated ZIF and crystalline dimensions are signatures of this structure. We observe that the templated chiral ZIF can facilitate the enantiotropic sensing. It shows enantioselective recognition and chiral sensing abilities with a low limit of detection of 39 μM and the corresponding limit of chiral detection of 300 μM for representative chiral amino acid, D- and L- alanine. 相似文献