全文获取类型
收费全文 | 64607篇 |
免费 | 5427篇 |
国内免费 | 4071篇 |
专业分类
耳鼻咽喉 | 525篇 |
儿科学 | 863篇 |
妇产科学 | 1078篇 |
基础医学 | 8218篇 |
口腔科学 | 1255篇 |
临床医学 | 7979篇 |
内科学 | 10570篇 |
皮肤病学 | 754篇 |
神经病学 | 3753篇 |
特种医学 | 2562篇 |
外国民族医学 | 52篇 |
外科学 | 6732篇 |
综合类 | 8102篇 |
现状与发展 | 19篇 |
一般理论 | 6篇 |
预防医学 | 4116篇 |
眼科学 | 1719篇 |
药学 | 6537篇 |
62篇 | |
中国医学 | 3016篇 |
肿瘤学 | 6187篇 |
出版年
2024年 | 174篇 |
2023年 | 951篇 |
2022年 | 2407篇 |
2021年 | 3181篇 |
2020年 | 2296篇 |
2019年 | 2165篇 |
2018年 | 2314篇 |
2017年 | 1940篇 |
2016年 | 1974篇 |
2015年 | 2778篇 |
2014年 | 3448篇 |
2013年 | 2949篇 |
2012年 | 4682篇 |
2011年 | 5192篇 |
2010年 | 3138篇 |
2009年 | 2376篇 |
2008年 | 3355篇 |
2007年 | 3452篇 |
2006年 | 3404篇 |
2005年 | 3414篇 |
2004年 | 2424篇 |
2003年 | 2346篇 |
2002年 | 2030篇 |
2001年 | 1285篇 |
2000年 | 1344篇 |
1999年 | 1451篇 |
1998年 | 984篇 |
1997年 | 934篇 |
1996年 | 724篇 |
1995年 | 676篇 |
1994年 | 547篇 |
1993年 | 362篇 |
1992年 | 435篇 |
1991年 | 397篇 |
1990年 | 358篇 |
1989年 | 300篇 |
1988年 | 324篇 |
1987年 | 256篇 |
1986年 | 243篇 |
1985年 | 192篇 |
1984年 | 134篇 |
1983年 | 105篇 |
1982年 | 63篇 |
1981年 | 57篇 |
1980年 | 54篇 |
1979年 | 99篇 |
1978年 | 44篇 |
1977年 | 35篇 |
1975年 | 43篇 |
1974年 | 54篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Jianhui Su Chaoyang Ma Chengxiang Liu Chuanzhong Gao Rongjing Nie 《International journal of food sciences and nutrition》2016,67(1):20-28
This study investigated the hypocholesterolaemic effects of bitter melon aqueous extracts (BMAE) in vitro, the inhibitory effects of BMAE on pancreatic cholesterol esterase (CEase) and incorporation of cholesterol into micelles were investigated. BMAE decreased the in vitro micellar solubility of cholesterol in a dose-dependent manner. The conformation of CEase was investigated by means of circular dichroism (CD) and fluorescence. The result revealed the decrease of α-helix contents, increase of β-sheet and exposure of aromatic amino acid residuals. The incorporation of cholesterol into micelles was inhibited by BMAE. A complex was observed by transmission electron microscopy (TEM), which indicated interaction between cholesterol and BMAE. The result revealed that BMAE can play a role in decreased intestinal cholesterol absorption via inhibition of CEase, and of micelle formation. 相似文献
2.
Shengxuan Cao Chen Wang Xin Ma Xu Wang Jiazhang Huang Chao Zhang Li Chen Xiang Geng Kan Wang 《Journal of orthopaedic research》2019,37(8):1860-1867
Patients with mechanic ankle instability experience increased tibiotalar and subtalar joint laxity. However, in vivo joint kinematics in functional ankle instability (FAI) patients and lateral ankle sprain (LAS) copers, especially during dynamic activities, are poorly understood. Ten FAI patients, 10 LAS copers, and 10 healthy controls were included in this study. A dual fluoroscopic imaging system was used to analyze the tibiotalar and subtalar joint kinematics during stair descent. Five key poses of stair descent were analyzed. Kinematic data from six degrees of freedom were calculated utilizing a solid modeling software. The range of motion and joint positions in each degree of freedom were compared among the three groups. The tibiotalar joints of FAI patients and LAS copers were significantly more inverted than those of healthy controls during the foot strike (p = 0.016, = 0.264). The subtalar joints of FAI patients were significantly more anteriorly translated (pose 2, p = 0.003, = 0.352; pose 3, p < 0.001, = 0.454; pose 4, p = 0.004, = 0.334), inverted (pose 4, p = 0.027, = 0.234; pose 5,p = 0.034, = 0.221), and externally rotated (pose 4, p = 0.037, = 0.217; pose 5; p = 0.004, = 0.331) than those of healthy controls during the mid‐stance and the heel off. The FAI patients showed excessive tibiotalar inversion and subtalar joint hypermobility during stair descent. Meanwhile, the LAS copers maintained subtalar joint stability, and only showed excessive tibiotalar inversion in foot strike. These data provide insight into the mechanisms behind the development of FAI after initial LAS. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1860–1867, 2019 相似文献
3.
4.
5.
6.
Inflammation but not obesity or insulin resistance is associated with increased plasma fibroblast growth factor 23 concentration in the elderly
下载免费PDF全文
![点击此处可从《Clinical endocrinology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
7.
8.
Parallel enzyme‐linked immunosorbent assay screening for human immunodeficiency virus among blood donors in five Chinese blood centres: a retrospective analysis
下载免费PDF全文
![点击此处可从《Transfusion medicine (Oxford, England)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
9.
10.