全文获取类型
收费全文 | 8211篇 |
免费 | 385篇 |
国内免费 | 79篇 |
专业分类
耳鼻咽喉 | 72篇 |
儿科学 | 135篇 |
妇产科学 | 166篇 |
基础医学 | 881篇 |
口腔科学 | 146篇 |
临床医学 | 506篇 |
内科学 | 2165篇 |
皮肤病学 | 181篇 |
神经病学 | 551篇 |
特种医学 | 387篇 |
外科学 | 1570篇 |
综合类 | 19篇 |
一般理论 | 1篇 |
预防医学 | 224篇 |
眼科学 | 227篇 |
药学 | 390篇 |
中国医学 | 15篇 |
肿瘤学 | 1039篇 |
出版年
2023年 | 58篇 |
2022年 | 45篇 |
2021年 | 213篇 |
2020年 | 124篇 |
2019年 | 154篇 |
2018年 | 230篇 |
2017年 | 158篇 |
2016年 | 182篇 |
2015年 | 215篇 |
2014年 | 258篇 |
2013年 | 339篇 |
2012年 | 572篇 |
2011年 | 649篇 |
2010年 | 361篇 |
2009年 | 320篇 |
2008年 | 593篇 |
2007年 | 601篇 |
2006年 | 542篇 |
2005年 | 531篇 |
2004年 | 465篇 |
2003年 | 474篇 |
2002年 | 421篇 |
2001年 | 88篇 |
2000年 | 82篇 |
1999年 | 104篇 |
1998年 | 114篇 |
1997年 | 67篇 |
1996年 | 68篇 |
1995年 | 47篇 |
1994年 | 66篇 |
1993年 | 45篇 |
1992年 | 50篇 |
1991年 | 38篇 |
1990年 | 35篇 |
1989年 | 39篇 |
1988年 | 34篇 |
1987年 | 30篇 |
1986年 | 20篇 |
1985年 | 22篇 |
1984年 | 24篇 |
1983年 | 20篇 |
1982年 | 23篇 |
1981年 | 18篇 |
1980年 | 12篇 |
1979年 | 8篇 |
1978年 | 26篇 |
1977年 | 15篇 |
1975年 | 8篇 |
1972年 | 7篇 |
1968年 | 9篇 |
排序方式: 共有8675条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
105.
106.
107.
Katia Herz Alexandra Becker Chenyue Shi Masatsugo Ema Satoru Takahashi Michael Potente Michael Hesse Bernd K. Fleischmann Daniela Wenzel 《Angiogenesis》2018,21(2):349-361
Endothelial cell proliferation is a key process during vascular growth but its kinetics could only be assessed in vitro or ex vivo so far. To enable the monitoring and quantification of cell cycle kinetics in vivo, we have generated transgenic mice expressing an eGFP-anillin construct under control of the endothelial-specific Flt-1 promoter. This construct labels the nuclei of endothelial cells in late G1, S and G2 phase and changes its localization during the different stages of M phase, thereby enabling the monitoring of EC proliferation and cytokinesis. In Flt-1/eGFP-anillin mice, we found eGFP+ signals specifically in Ki67+/PECAM+ endothelial cells during vascular development. Quantification using this cell cycle reporter in embryos revealed a decline in endothelial cell proliferation between E9.5 to E12.5. By time-lapse microscopy, we determined the length of different cell cycle phases in embryonic endothelial cells in vivo and found a M phase duration of about 80 min with 2/3 covering karyokinesis and 1/3 cytokinesis. Thus, we have generated a versatile transgenic system for the accurate assessment of endothelial cell cycle dynamics in vitro and in vivo. 相似文献
108.
Tomohisa Furuya Satoru Sugimoto Chie Kurokawa Shuichi Ozawa Kumiko Karasawa Keisuke Sasai 《Journal of radiation research》2013,54(1):157-165
To evaluate the dosimetric impact of respiratory breast motion and daily setup error on whole breast irradiation (WBI) using three irradiation techniques; conventional wedge (CW), field-in-field (FIF) and irregular surface compensator (ISC). WBI was planned for 16 breast cancer patients. The dose indices for evaluated clinical target volume (CTVevl), lung, and body were evaluated. For the anterior-posterior (AP) respiratory motion and setup error of a single fraction, the isocenter was moved according to a sine function, and the dose indices were averaged over one period. Furthermore, the dose indices were weighted according to setup error frequencies that have a normal distribution to model systematic and random setup error for the entire treatment course. In all irradiation techniques, AP movement has a significant impact on dose distribution. CTVevlD95 (the minimum relative dose that covers 95 % volume) and V95 (the relative volume receiving 95 % of the prescribed dose) were observed to significantly decrease from the original ISC plan when simulated for the entire treatment course. In contrast, the D95, V95 and dose homogeneity index did not significantly differ from those of the original plans for FIF and CW. With regard to lung dose, the effect of motion was very similar among all three techniques. The dosimetric impact of AP respiratory breast motion and setup error was largest for the ISC technique, and the second greatest effect was observed with the FIF technique. However, these variations are relatively small. 相似文献
109.
Hiroki Tojima Satoru Kakizaki Takashi Kosone Norio Horiguchi Yuichi Yamazaki Ken Sato Hitoshi Takagi Masatomo Mori 《Hepatology International》2012,6(3):620-630
Background
Hepatocyte growth factor (HGF) is a potent growth factor involved in liver regeneration that has various effects on epithelial and nonepithelial cells. Although it has been demonstrated that HGF can reduce liver inflammation or fibrosis caused by pharmaceutical or chemical insult, no examination of its effect on liver injury in nonalcoholic steatohepatitis (NASH) has been reported. 相似文献110.