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   6531篇
  免费   270篇
  国内免费   513篇
耳鼻咽喉   53篇
儿科学   117篇
妇产科学   102篇
基础医学   804篇
口腔科学   94篇
临床医学   530篇
内科学   1186篇
皮肤病学   47篇
神经病学   343篇
特种医学   150篇
外科学   730篇
综合类   1356篇
现状与发展   93篇
一般理论   2篇
预防医学   563篇
眼科学   115篇
药学   417篇
中国医学   273篇
肿瘤学   339篇
  2024年   29篇
  2023年   142篇
  2022年   102篇
  2021年   95篇
  2020年   54篇
  2019年   39篇
  2018年   68篇
  2017年   63篇
  2016年   35篇
  2015年   58篇
  2014年   87篇
  2013年   304篇
  2012年   504篇
  2011年   557篇
  2010年   191篇
  2009年   148篇
  2008年   831篇
  2007年   470篇
  2006年   551篇
  2005年   431篇
  2004年   361篇
  2003年   328篇
  2002年   335篇
  2001年   252篇
  2000年   303篇
  1999年   166篇
  1998年   39篇
  1997年   22篇
  1996年   8篇
  1995年   9篇
  1993年   9篇
  1991年   9篇
  1959年   70篇
  1958年   111篇
  1957年   92篇
  1956年   76篇
  1955年   62篇
  1954年   45篇
  1949年   16篇
  1948年   19篇
  1945年   8篇
  1931年   11篇
  1930年   12篇
  1929年   14篇
  1928年   16篇
  1927年   15篇
  1926年   11篇
  1925年   14篇
  1924年   19篇
  1923年   11篇
排序方式: 共有7314条查询结果,搜索用时 15 毫秒
1.
Objective We sought to evaluate the relationship between the ST-segment elevation in lead aVR in the acute myocardial infarction and the acute left main coronary artery obstruction.  相似文献   
2.
Since the International Conference on Population and Development held in Cairo in 1994, and the Fourth World Conference on Women held in Beijing in 1995, the international organizations and public health communities have paid more attention to reproductiv…  相似文献   
3.
Objective To investigate the role of poly-lactic acid and agarose gelatin in promoting the functional recovery of the injured spinal cord. Methods Poly-lactic acid ( PLA) or agarose was embedded in the space between two stumps of the hemisectioned spinal cord. Immunohistochemistry was used to show astroglia proliferation and the infiltration of RhoA-positive cells. Locomotor activity recovery was evaluated by testing the function of hindlimbs. Results Astrogli-as and RhoA labeled non-neuronal cells accumulated in the area adjacent to the implant, while the number of RhoA-positive cells was decreased dramatically in the absence of implant. Animals implanted with agarose gelatin recovered more quickly than those with PLA, concomitant with a higher survival rate of the neurons. Conclusion Both PLA and agarose gelatin benefited the recovery of spinal cord after injury by providing a scaffold for astroglia processes. Modulation of the rigidity, pore size and inner structure of PLA and agarose gelatin might make these biodegradable materials more effective in the regeneration of the central nervous system (CNS).  相似文献   
4.
LI 《东方养生》2007,(11):84-85
男人穿衣,不是穿虚荣心,是要穿出“秩序”、穿出“法律”、穿出“思想”、穿出“政治”来的。这是一场男人和服装间有关“政治信仰”和“生活方式”的较量。[编者按]  相似文献   
5.
6.
LI Tao 《现代护理》2007,13(5):1180-1181
I was honored to study the undergraduate course in Hong Kong Polytechnic University for 4 months in 2006, experienced the characteristic and teaching mode of Hong Kong nursing education on undergraduate course personally. Make an introduction from respects such as course offered, teaching method, educational idea, examination way, etc. now, and compare with domestic nursing education.  相似文献   
7.
AIM: To determine the safety, tolerability and pharmacokinetic parameters of a new drug recombinant human parathyroid hormone [ rhPTH (1-84)] in healthy male Chinese subjects. METHODS: domly divided Thirty-six healthy male volunteers were rangroups received into 3 groups. The volunteers in these single subcutaneous injection of rhPTH ( 1-84) in a dosage of 1, 2 and 4 μg/kg respectively. Blood samples were obtained before and after administration within 24 hours. The rhPTH concentrations in sennn were determined by enzyme linked immunosorbent assay (ELISA). The pharmacokinetic parameters determined with use of standard noncompartmental analysis were the maximum serum concentration ( Cmax ), the time to attain that concentration ( tmax ), and the area under the serum concentration-time curve up to 24 hours( AUC0-24 ) and up to infinity (AUC0-∞). Dose proportionality of pharmacokinetic parameters (AUC, Cmax of every volunteer of each dosage and A UC was computed from log transformed data) and was examined by mean of analysis of variance (ANOVA) using SPSS software package. In the study, subjects' symptoms, objective signs, and vital signs, including blood pressure, heart rate, respiratory rate and body temperature, were checked and 12-lead electrocardiography was recorded before and after drug administration within 24 hours. Routine laboratory tests, including hematology, blood biochemistry, serum electrolyte, and urinalysis, were performed before and after drug administration within at 24 hours.[第一段]  相似文献   
8.
ComparisonoftripletherapywithlansoprazoleorfamotidineforHelicobacterpyloriassociatedduodenalulcerWANGXiaoZhong,LIBinandLING...  相似文献   
9.
Objective To observe changes of hepatic hemodynamics and hepatic functional reserve after splenectomy and periesophagogastric devascularization. Methods From July 2006 to August 2007, thirty patients with portal hypertension caused by hepatitis B cirrhosis underwent splenectomy and periesophagogastric devascuiarization. The PVPG (portal venous pressure gradient) was measured by inductor continually during operation. The HAF (hepatic artery flow), PVF (portal venours flow) and hepatic arterial RI(resistant index) were measured with Doppler sonography. The EHBF(effective hepatic blood flow) and ICGR15 (indocyaninegreen retention rate at 15 minutes) were obtained respectively by indocyaninegreen clearance test before and after the operation. Results PVPG after laparotomy (19±4) mm Hg, ligating the splenic artery(14±4) mm Hg, splenectomy(14±3)mm Hg and periesophagogastric devascularization (12±4) mm Hg showed a tendency to decrease progressively. The PVF decreased [from (42±14) ml/s to (16±8) ml/s] and HAF increased in compensation after operation. The EHBF increased [from (0.48±0.10) L/min to (0.56±0.10) L/min], and the ICGR15 decreased (from 23%±8% to 18%±4%) postoperatively. Conclusion After splenectomy and periesophagogastric devascularization, the hepatic functional reserve improves at least in a short term notwithstanding the decrease of PVPG and PVF.  相似文献   
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