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   327064篇
  免费   63059篇
  国内免费   14350篇
耳鼻咽喉   3915篇
儿科学   7444篇
妇产科学   5882篇
基础医学   45954篇
口腔科学   9621篇
临床医学   43192篇
内科学   63305篇
皮肤病学   10426篇
神经病学   27198篇
特种医学   11957篇
外国民族医学   96篇
外科学   42295篇
综合类   34111篇
现状与发展   48篇
一般理论   77篇
预防医学   19243篇
眼科学   8385篇
药学   30852篇
  158篇
中国医学   11999篇
肿瘤学   28315篇
  2024年   435篇
  2023年   3224篇
  2022年   4766篇
  2021年   12569篇
  2020年   13202篇
  2019年   17908篇
  2018年   17858篇
  2017年   17985篇
  2016年   18448篇
  2015年   21882篇
  2014年   24615篇
  2013年   24420篇
  2012年   23112篇
  2011年   24676篇
  2010年   20951篇
  2009年   15196篇
  2008年   16007篇
  2007年   14947篇
  2006年   14427篇
  2005年   14243篇
  2004年   10290篇
  2003年   9214篇
  2002年   8143篇
  2001年   7436篇
  2000年   7470篇
  1999年   7218篇
  1998年   3858篇
  1997年   3854篇
  1996年   2969篇
  1995年   2742篇
  1994年   2378篇
  1993年   1609篇
  1992年   2544篇
  1991年   2190篇
  1990年   1843篇
  1989年   1624篇
  1988年   1412篇
  1987年   1260篇
  1986年   1039篇
  1985年   822篇
  1984年   575篇
  1983年   436篇
  1982年   282篇
  1981年   247篇
  1980年   237篇
  1979年   308篇
  1978年   188篇
  1977年   159篇
  1976年   134篇
  1974年   162篇
排序方式: 共有10000条查询结果,搜索用时 359 毫秒
61.
62.
BackgroundDual antiplatelet therapy (DAPT) is the cornerstone treatment of acute myocardial infarction (AMI).ObjectiveThe present study aimed to investigate the efficacy and safety of triple antiplatelet therapy (TAPT) in elderly female patients with diabetes and ST segment elevation myocardial infarction (STEMI), who had undergone percutaneous coronary intervention (PCI).MethodsWe designed a randomized, single-blind study. Control group A (97 elderly male patients with diabetes and STEMI, whose CRUSADE scores were < 30) received aspirin, ticagrelor, and tirofiban. A total of 162 elderly female patients with diabetes and STEMI were randomly divided into two groups according to CRUSADE score. Group B (69 patients with CRUSADE score > 31) received aspirin and ticagrelor. Group C (93 patients with CRUSADE score < 30) received aspirin, ticagrelor and tirofiban. P values < 0.05 were considered statistically significant.ResultsCompared to the findings in group A, post-PCI Thrombolysis in Myocardial Infarction (TIMI) grade 3 blood flow and TIMI myocardial perfusion grade 3 were significantly less prevalent in group B (p < 0.05). When compared to groups A and C, the incidence of major adverse complications was significantly higher in group B (p < 0.05).ConclusionTAPT could effectively reduce the incidence of major complications in elderly female patients with diabetes and STEMI. However, close attention should be paid to hemorrhage in patients receiving TAPT. (Arq Bras Cardiol. 2020; [online].ahead print, PP.0-0)  相似文献   
63.
64.
目的以基因表达数据集资料为研究对象,分析BCAN基因在肾透明细胞癌中的表达情况以及对患者预后的影响。方法在Oncomine数据库中挖掘BCAN在肾透明细胞癌(ccRCC)中的表达情况。从TCGA数据库中获取ccRCC患者临床资料和目的基因的表达信息并进行统计分析。利用GEO数据库中GSE73731数据集的ccRCC样本进行基因富集分析。利用String数据库分析与BCAN相关的蛋白。结果BCAN低表达组的ccRCC患者在病理分期及T分期方面低于高表达组(P<0.001;P=0.001);N分期及M分期差异无统计学意义(P>0.05)。BCAN低表达组患者的总生存期优于高表达组(P=0.033)。BCAN基因高表达组的样本主要富集在KRAS信号通路。结论BCAN可以通过多种途径来促进肿瘤细胞的侵袭能力,有望成为ccRCC不良预后的重要生物标志物之一。  相似文献   
65.
The current situation in which the humanities are disparaged affects all university disciplines, including nursing, in whose historical evolution the humanities have always been present in one form or another. Looking beyond this disrepute, this study proposes that nursing renew its attention to classical philosophy. Specifically, it invites a close reading of Xenophon's Anabasis and Plato's Meno, to get three related goals: to show how the use of ancient texts are very valuable tools for the philosophical initiation of nursing students and can help them reflect on their choice of nursing as a practical activity; to reflect on the problem of virtue and the nature of the good life; and to show how the interaction with ancient texts allows students to reflect on questions and issues of life, theirs and others, that are not open to investigation through a purely scientific method. Consequently, both Anabasis and Meno readings strengthen the intellectual relationship between philosophy and nursing, enabling the latter to delve deeper into the key questions of its own thought as a discipline.  相似文献   
66.
67.
Wang  Di  Tao  Xiaogen  Fei  Mingming  Chen  Jian  Guo  Wei  Li  Ping  Wang  Jinquan 《Journal of neurovirology》2020,26(3):442-448

Pseudorabies virus (PRV) primarily infects swine but can infect cattle, dogs, and cats. Several studies have reported that PRV can cross the specie barrier and induce human encephalitis, but a definitive diagnosis of human PRV encephalitis is debatable due to the lack of PRV DNA detection. Here, we report a case of human PRV encephalitis diagnosed by the next-generation sequencing (NGS) of PRV sequences in the cerebrospinal fluid (CSF) of a patient. A male pork vendor developed fever and seizures for 6 days. NGS results showed PRV sequences in his CSF and blood. Sanger sequencing showed that PRV DNA in the CSF and PRV antibodies in both the CSF and blood were positive. MRI results revealed multiple inflammatory lesions in the bilateral hemisphere. Based on the clinical and laboratory data, we diagnosed the patient with PRV encephalitis. This case suggests that PRV can infect humans, causing severe viral encephalitis. People at risk of PRV infection should improve their self-protection awareness.

  相似文献   
68.
69.
70.
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