首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   62531篇
  免费   5825篇
  国内免费   2291篇
耳鼻咽喉   675篇
儿科学   824篇
妇产科学   1160篇
基础医学   9186篇
口腔科学   1664篇
临床医学   5713篇
内科学   11352篇
皮肤病学   1090篇
神经病学   4225篇
特种医学   2031篇
外国民族医学   7篇
外科学   8105篇
综合类   6253篇
现状与发展   3篇
一般理论   5篇
预防医学   3842篇
眼科学   1703篇
药学   6119篇
  22篇
中国医学   1673篇
肿瘤学   4995篇
  2024年   101篇
  2023年   451篇
  2022年   933篇
  2021年   1268篇
  2020年   930篇
  2019年   1063篇
  2018年   1562篇
  2017年   1289篇
  2016年   1200篇
  2015年   1515篇
  2014年   1920篇
  2013年   2261篇
  2012年   3099篇
  2011年   2993篇
  2010年   1931篇
  2009年   1798篇
  2008年   2494篇
  2007年   2533篇
  2006年   2296篇
  2005年   1933篇
  2004年   1607篇
  2003年   1581篇
  2002年   1477篇
  2001年   4770篇
  2000年   4680篇
  1999年   3998篇
  1998年   1435篇
  1997年   1068篇
  1996年   651篇
  1995年   528篇
  1994年   480篇
  1993年   436篇
  1992年   1945篇
  1991年   1689篇
  1990年   1551篇
  1989年   1501篇
  1988年   1313篇
  1987年   1196篇
  1986年   1066篇
  1985年   902篇
  1984年   589篇
  1983年   470篇
  1982年   254篇
  1981年   180篇
  1980年   141篇
  1979年   280篇
  1978年   77篇
  1974年   75篇
  1973年   95篇
  1972年   71篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Clinical and Experimental Medicine - Colon cancer is one of most common cancers. The progression of various cancers is driven by miRNA-570. The role of miRNA-570 in the progression of colon cancer...  相似文献   
2.
3.
Bipolar disorder (BD) is a common psychiatric mood disorder affecting more than 1-2% of the general population of different European countries. Unfortunately, there is no objective laboratory-based test to aid BD diagnosis or monitor its progression, and little is known about the molecular basis of BD. Here, we performed a comparative proteomic study to identify differentially expressed plasma proteins in various BD mood states (depressed BD, manic BD, and euthymic BD) relative to healthy controls. A total of 10 euthymic BD, 20 depressed BD, 15 manic BD, and 20 demographically matched healthy control subjects were recruited. Seven high-abundance proteins were immunodepleted in plasma samples from the 4 experimental groups, which were then subjected to proteome-wide expression profiling by two-dimensional electrophoresis and matrix-assisted laser desorption/ionization-time-of-flight/time-of-flight tandem mass spectrometry. Proteomic results were validated by immunoblotting and bioinformatically analyzed using MetaCore. From a total of 32 proteins identified with 1.5-fold changes in expression compared with healthy controls, 16 proteins were perturbed in BD independent of mood state, while 16 proteins were specifically associated with particular BD mood states. Two mood-independent differential proteins, apolipoprotein (Apo) A1 and Apo L1, suggest that BD pathophysiology may be associated with early perturbations in lipid metabolism. Moreover, down-regulation of one mood-dependent protein, carbonic anhydrase 1 (CA-1), suggests it may be involved in the pathophysiology of depressive episodes in BD. Thus, BD pathophysiology may be associated with early perturbations in lipid metabolism that are independent of mood state, while CA-1 may be involved in the pathophysiology of depressive episodes.  相似文献   
4.
李宝生  张旋 《药品评价》2020,(13):19-22
目的:通过布局网络版色谱工作站,实现色谱系统电子实验数据合规化,提升实验室色谱电子数据的安全性,提高实验室色谱系统管理的效率。方法:布局线上网络版色谱工作站。结果:工作站运行良好,升级数据安全,法规响应更完善,节省了实验室管理及维护成本。结论:值得在有色谱需求的实验室推广。  相似文献   
5.
Porocarcinoma is an unusual, locally aggressive and potentially fatal neoplasm. Several cutaneous malignancies have been described in association with porocarcinoma, including squamous cell carcinoma, basal cell carcinoma and tricholemmal carcinoma. Previous reports have indicated that the occurrence of malignant tumours in combination with porocarcinoma is extremely rare, in particular with regard to Bowen disease (BD). We report an uncommon case of porocarcinoma occurring synchronously in a single BD lesion in a 63‐year‐old woman with multiple BD lesions. The clinical and histological findings confirmed this diagnosis.  相似文献   
6.
Hypertrophic lichen planus (HLP) is a T‐cell‐mediated process typically presenting with hypertrophic or verrucous plaques on the lower limbs. We report the case of a 24‐year‐old woman with a history of HLP since age 3 years presenting with rapid malignant transformation of one lesion into a large squamous cell carcinoma (SCC). Subsequent examination revealed progressive, widespread metastatic involvement, and the patient ultimately died from her disease. SCC associated with HLP is rare, with a review of the literature revealing fewer than 50 cases. This case highlights the need to be aware of suspicious changes in HLP and to educate patients as to when to be reevaluated.  相似文献   
7.
8.
9.
10.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号