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   236390篇
  免费   7531篇
  国内免费   4813篇
耳鼻咽喉   1610篇
儿科学   7197篇
妇产科学   3578篇
基础医学   23636篇
口腔科学   2740篇
临床医学   20690篇
内科学   40254篇
皮肤病学   1260篇
神经病学   19778篇
特种医学   11111篇
外国民族医学   52篇
外科学   34960篇
综合类   13306篇
现状与发展   19篇
一般理论   5篇
预防医学   22343篇
眼科学   4585篇
药学   16183篇
  39篇
中国医学   4103篇
肿瘤学   21285篇
  2024年   270篇
  2023年   1173篇
  2022年   2730篇
  2021年   3429篇
  2020年   2617篇
  2019年   2269篇
  2018年   23953篇
  2017年   19294篇
  2016年   21319篇
  2015年   3850篇
  2014年   4458篇
  2013年   3878篇
  2012年   11723篇
  2011年   26053篇
  2010年   21752篇
  2009年   13823篇
  2008年   22655篇
  2007年   24727篇
  2006年   3609篇
  2005年   5189篇
  2004年   5298篇
  2003年   6211篇
  2002年   4039篇
  2001年   1646篇
  2000年   1824篇
  1999年   1792篇
  1998年   1189篇
  1997年   1161篇
  1996年   781篇
  1995年   738篇
  1994年   735篇
  1993年   449篇
  1992年   598篇
  1991年   507篇
  1990年   509篇
  1989年   399篇
  1988年   367篇
  1987年   293篇
  1986年   238篇
  1985年   209篇
  1984年   116篇
  1983年   80篇
  1982年   69篇
  1981年   41篇
  1980年   58篇
  1979年   44篇
  1938年   61篇
  1934年   34篇
  1932年   57篇
  1930年   47篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Intraosseous ganglia of the glenoid are rare, and their etiology is unknown. This report describes a case of an intraosseous ganglion about to cause fracture of the glenoid. The patient was a 61-year-old woman with a painful left shoulder with a limited range of motion. Her symptoms did not improve after non-operative treatment. Arthroscopic examination showed a cartilage defect and erosion in the posteroinferior portion of the glenoid, behind which computed tomography (CT) showed a cystic lesion of the glenoid. There was no communication between the cyst and the joint space. The patient was treated by curettage and an autogenous cancellous bone graft from the iliac crest. Two years after the operation, the patient was almost free from pain, and CT showed good integration of the bone graft.  相似文献   
102.
103.
104.
105.
脊柱侧弯是青少年的多发病,发病率约1%,不但影响美观,也给患者心理健康造成危害,而且严重影响患者的心肺功能,甚至导致截瘫,目前最好的治疗方法是早期手术.  相似文献   
106.
107.
108.

Background  

It has been observed that ras-transformed cell lines in culture have a higher phosphatidylcholine (PC) biosynthesis rate as well as higher PC-degradation rate (increased PC-turnover) than normal cells. In correspondence to these findings, the concentrations of the PC-degradation product lyso-phosphatidylcholine (LPC) in cancer patients were found to be decreased. Our objective was the systematic investigation of the relationship between LPC and inflammatory and nutritional parameters in cancer patients. Therefore, plasma LPC concentrations were assessed in 59 cancer patients and related to nutritional and inflammatory parameters. To determine LPC in blood plasma we developed and validated a HPTLC method.  相似文献   
109.
110.
Effects of stimulation of brainstem sites on hemodynamics and plasma catecholamine levels were assessed in cats under chloralose-urethane anesthesia. Pressor areas of the dorsal medulla (DM) and ventrolateral medulla (VLM) and the depressor area of the paramedian reticular nucleus (PRN) were stimulated electrically using a monopolar electrode, or chemically using sodium glutamate microinjection. Plasma levels of norepinephrine (NE) and epinephrine (EPI) were measured in caval blood above the adrenal veins. Electrical stimulation of the DM and VLM produced increases in blood pressure and in plasma NE and EPI levels that were enhanced after acute vagotomies. The NE and EPI responses were attenuated after acute, bilateral adrenalectomies, confirming augmented adrenomedullary secretion, whereas the pressor responses were intact. Injection of sodium glutamate into the same pressor regions of the DM or VLM also produced pressor responses and elevated plasma catecholamine levels, indicating that the responses resulted from activation of neuronal perikarya. Stimulation of the PRN attenuated pressor and catecholamine responses during stimulation of the DM and VLM. The results indicate that pressor responses during stimulation of the DM and VLM are due at least partly to activation of perikarya in these regions, are associated with but not dependent on adrenomedullary activation, and are enhanced after vagotomy; and that neurons of the PRN exert inhibitory modulation of the pressor and adrenomedullary responses during stimulation of VLM and DM.  相似文献   
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