全文获取类型
收费全文 | 1367篇 |
免费 | 60篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 22篇 |
儿科学 | 56篇 |
妇产科学 | 24篇 |
基础医学 | 195篇 |
口腔科学 | 36篇 |
临床医学 | 143篇 |
内科学 | 236篇 |
皮肤病学 | 13篇 |
神经病学 | 121篇 |
特种医学 | 197篇 |
外科学 | 154篇 |
综合类 | 34篇 |
预防医学 | 46篇 |
眼科学 | 23篇 |
药学 | 96篇 |
肿瘤学 | 45篇 |
出版年
2022年 | 9篇 |
2021年 | 25篇 |
2020年 | 8篇 |
2019年 | 10篇 |
2018年 | 16篇 |
2017年 | 11篇 |
2016年 | 12篇 |
2015年 | 26篇 |
2014年 | 32篇 |
2013年 | 39篇 |
2012年 | 39篇 |
2011年 | 57篇 |
2010年 | 36篇 |
2009年 | 37篇 |
2008年 | 38篇 |
2007年 | 66篇 |
2006年 | 53篇 |
2005年 | 52篇 |
2004年 | 40篇 |
2003年 | 36篇 |
2002年 | 31篇 |
2001年 | 20篇 |
2000年 | 29篇 |
1999年 | 42篇 |
1998年 | 47篇 |
1997年 | 56篇 |
1996年 | 41篇 |
1995年 | 44篇 |
1994年 | 27篇 |
1993年 | 30篇 |
1992年 | 31篇 |
1991年 | 34篇 |
1990年 | 33篇 |
1989年 | 22篇 |
1988年 | 37篇 |
1987年 | 35篇 |
1986年 | 35篇 |
1985年 | 25篇 |
1984年 | 11篇 |
1983年 | 14篇 |
1982年 | 21篇 |
1981年 | 13篇 |
1980年 | 26篇 |
1979年 | 9篇 |
1978年 | 16篇 |
1977年 | 24篇 |
1976年 | 13篇 |
1975年 | 15篇 |
1971年 | 3篇 |
1970年 | 3篇 |
排序方式: 共有1441条查询结果,搜索用时 125 毫秒
1.
2.
3.
4.
5.
W Peczyńska-Czoch M Mordarski L Kaczmarek P Nantka-Namirski 《Archivum immunologiae et therapiae experimentalis》1987,35(2):89-95
Microbial transformation of selected azacarbazoles, compounds noted for their activity as antitumor agents, conducted with Kitasatosporia setae strain resulted in N-methylation of pyridine nucleus of alpha-, beta- and gamma-carboline molecule. Formed quaternized intermediates were converted in alkaline conditions into corresponding iso-carbolines. The structure of the final products, alpha-, beta- and gamma-iso-carbolines have been established on the basis of spectral data and confirmed by chemical synthesis. 相似文献
6.
7.
Jan Groetzner Ingo Kaczmarek Bruno Meiser Markus Müller Sabine Daebritz Bruno Reichart 《The Journal of heart and lung transplantation》2004,23(6):770-773
Chronic renal failure triggered by calcineurin inhibitor (CNI)-based immunosuppression is a common complication after cardiac transplantation. Sirolimus and mycophenolate mofetil (MMF) are 2 newer immunosuppressive agents with no documented nephrotoxic side effects. This case report describes a patient with ongoing chronic renal failure 10 months after cardiac transplantation on cyclosporine-based immunosuppressive therapy. Conversion of the immunosuppressive regimen from cyclosporine to sirolimus and MMF resulted in freedom from acute rejection, excellent cardiac graft function and consistently improved renal function. This case illustrates the beneficial potential of sirolimus and MMF as CNI-free and safe long-term immunosuppression in a patient with chronic renal failure after heart transplantation. 相似文献
8.
Prior studies have shown that pneumothorax is one of the more difficult entities to diagnose with digitized radiography. This study was designed to test whether increasing resolution from 1.25 to 2.5 line pairs per millimeter (lp/mm) and image processing (edge enhancement from unsharp masking) would increase accuracy and confidence in the diagnosis of pneumothorax, as well as normal cases and other forms of lung disease. Conventional radiographs were digitized with use of a laser reader and then reformatted as film hard copy. Eleven observers read 35 cases reformatted in three different ways (1.25 lp/mm, 2.5 lp/mm, 1.25 lp/mm unsharp mask). The images with finer resolution (2.5 lp/mm) and unsharp mask images were superior to those with coarser resolution (1.25 lp/mm) for the diagnosis of pneumothorax. There was no difference in diagnostic accuracy for normal patients. For abnormalities other than pneumothorax, the unsharp mask images were significantly worse. Confidence in the diagnosis of pneumothorax and other abnormalities was highest with the finest resolution (2.5 lp/mm). 相似文献
9.
10.
导数光谱系数倍率法测定多组分体系感冒清胶囊中盐酸吗啉胍的含量 总被引:1,自引:0,他引:1
This paper provides a basic principle and experimental technique of derivative signal multiplier spectrophotometry in multicomponent mixture. A microcomputer was used to process the spectral data measured on a manual spectrophotometer (UV-7520) for the determination of moroxydine hydrochloride in Gan Mao Qing capsules. Quantitative analysis of multicomponent mixture can be done without sample separation. The selection of optimal wavelength pairs is performed through the program with a computer. The method needs no special spectrophotometer and is simple, rapid and easy to operate. The mean recovery was 99.98 +/- 0.53% (n = 12). 相似文献