全文获取类型
收费全文 | 666篇 |
免费 | 29篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 31篇 |
妇产科学 | 17篇 |
基础医学 | 49篇 |
口腔科学 | 5篇 |
临床医学 | 23篇 |
内科学 | 167篇 |
皮肤病学 | 18篇 |
神经病学 | 32篇 |
特种医学 | 42篇 |
外科学 | 57篇 |
综合类 | 9篇 |
现状与发展 | 1篇 |
预防医学 | 44篇 |
眼科学 | 22篇 |
药学 | 123篇 |
中国医学 | 7篇 |
肿瘤学 | 45篇 |
出版年
2022年 | 8篇 |
2021年 | 18篇 |
2020年 | 7篇 |
2019年 | 18篇 |
2018年 | 28篇 |
2017年 | 16篇 |
2016年 | 14篇 |
2015年 | 20篇 |
2014年 | 31篇 |
2013年 | 38篇 |
2012年 | 52篇 |
2011年 | 53篇 |
2010年 | 21篇 |
2009年 | 29篇 |
2008年 | 26篇 |
2007年 | 36篇 |
2006年 | 29篇 |
2005年 | 18篇 |
2004年 | 16篇 |
2003年 | 16篇 |
2002年 | 19篇 |
2001年 | 9篇 |
2000年 | 10篇 |
1999年 | 5篇 |
1998年 | 6篇 |
1997年 | 7篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 9篇 |
1991年 | 20篇 |
1990年 | 16篇 |
1989年 | 19篇 |
1988年 | 15篇 |
1987年 | 9篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 6篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 6篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1967年 | 2篇 |
1966年 | 1篇 |
排序方式: 共有698条查询结果,搜索用时 15 毫秒
1.
2.
Rahul V. Patel Premlata Kumari Dhanji P. Rajani Kishor H. Chikhalia 《Medicinal chemistry research》2012,21(12):4177-4192
A series of 2-(4-cyano-3-trifluoromethylphenyl amino)-4-(4-quinazolinyloxy)-6-piperazinyl(piperidinyl)-s-triazines have been synthesized in this study by a simple and efficient synthetic protocol. The synthetic route to final piperazinyl s-triazines involved two nucleophilic substitution reactions of 4-amino-2-trifluoromethyl-benzonitrile and 4-hydroxyquinazoline with 2,4,6-trichloro-1,3,5-triazine resulting in 2,4-disubstituted-6-chloro-1,3,5-triazine derivative to introduce the piperazinyl or piperidinyl functionality. The structures of the compounds were elucidated with the aid of IR, 1H NMR, 13C NMR, 19F NMR spectroscopy, and elemental analysis. The antimicrobial activity of the compounds was tested against eight bacteria (Staphylococcus aureus MTCC 96, Bacillus cereus MTCC 619, Escherichia coli MTCC 739, Pseudomonas aeruginosa MTCC 741, Klebsiella pneumoniae MTCC 109, Salmonella typhi MTCC 733, Proteus vulgaris MTCC 1771, Shigella Flexneria MTCC 1457) and four fungi (Aspergillus niger MTCC 282, Aspergillus fumigatus MTCC 343, Aspergillus clavatus MTCC 1323, and Candida albicans MTCC 183). The title compounds were also investigated for their antituberculosis activity against MTB H37 RV strain using BACTEC MGIT and L. J. agar dilution method. The bioassay results showed that compounds 5d, 5n, 5p, 5s, and 5t demonstrated 99% inhibition at the MIC of 6.25?μg/ml, equivalent to standard drug pyrazinamide. 相似文献
3.
Mahajan NN Mahajan KN Soni RN 《European journal of obstetrics, gynecology, and reproductive biology》2007,134(2):268; author reply 268-268; author reply 269
4.
5.
Masamichi Hayashi Nissim Silanikove Xiaofei Chang Rajani Ravi Vui Pham Gilson Baia Keren Paz Mariana Brait David Sidransky Wayne M Koch 《Cancer biology & therapy》2015,16(8):1184-1193
Triple negative breast cancer has an extremely poor prognosis when chemotherapy is no longer effective. To overcome drug resistance, novel drug delivery systems based on nanoparticles have had remarkable success. We produced a novel nanoparticle component ‘MDC’ from milk-derived colloid. In order to evaluate the anti-cancer effect of MDC, we conducted in vitro and in vivo experiments on cancer cell lines and a primary tumor derived breast xenograft. Doxorubicin (Dox) conjugated to MDC (MDC-Dox) showed higher cancer cell growth inhibition than MDC alone especially in cell lines with high EGFR expression. In a mouse melanoma model, MDC-Dox significantly suppressed tumor growth when compared with free Dox. Moreover, in a primary tumor derived breast xenograft, one of the mice treated with MDC-Dox showed partial regression, while mice treated with free Dox failed to show any suppression of tumor growth. We have shown that a novel nanoparticle compound made of simple milk-derived colloid has the capability for drug conjugation, and serves as a tumor-specific carrier of anti-cancer drugs. Further research on its safety and ability to carry various anti-cancer drugs into multiple drug-resistant primary breast models is warranted. 相似文献
7.
8.
9.
Vasanthan Ravichandran Rajani Kant Rai Venkitasamay Kesavan 《Journal of biomaterials science. Polymer edition》2017,28(18):2131-2142
A new approach for the design and synthesis of cyclic N-halamine polymers having anti-bacterial activity based on a vinyl derivative of tyrosine-derived hydantoin is reported. The synthesis of N-halamine polymers generally involves the chemical modification of 5,5′-disubstituted hydantoin to introduce polymerizable vinyl moieties thereby restricting the halogen capture only on the amide nitrogen. Here we show the possibility of synthesizing vinyl monomers of N-halamine from α-amino acids wherein both the amide and imide nitrogens are available for halogen capture. Thus, a hydantoin monomer was synthesized from L-tyrosine and copolymerized with methyl methacrylate and 2-(hydroxyethyl)methacrylate, to obtain random co-polymers. The monomer and its co-polymers were characterized using NMR, IR, HRMS, GPC, DSC, EDAX and TGA analysis. Films of the co-polymers cast from 10% acetone solutions were exposed to sodium hypochlorite solution to activate the hydantoin moieties. The oxidative chlorine content of the films ranged from 0.6 to 0.9%. The activated films were exposed to both Gram positive (S. aureus) and Gram negative (E. coli) bacteria using standard protocols. Polymers having chlorine content as little as 0.6% exhibited 6 log reduction in the bacterial growth within 30 min of exposure. The method allows the halogenation of both amide and imide nitrogens and could be applied to the preparation of a number of vinyl hydantoins from many amino acids. 相似文献
10.