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   534614篇
  免费   28014篇
  国内免费   511篇
耳鼻咽喉   6702篇
儿科学   17106篇
妇产科学   12681篇
基础医学   93307篇
口腔科学   12416篇
临床医学   49154篇
内科学   96165篇
皮肤病学   11915篇
神经病学   34437篇
特种医学   19908篇
外国民族医学   53篇
外科学   78740篇
综合类   7772篇
现状与发展   2篇
一般理论   113篇
预防医学   39009篇
眼科学   11986篇
药学   41662篇
  1篇
中国医学   1131篇
肿瘤学   28879篇
  2021年   4037篇
  2019年   4012篇
  2018年   5873篇
  2017年   4230篇
  2016年   4990篇
  2015年   5479篇
  2014年   7265篇
  2013年   10698篇
  2012年   15857篇
  2011年   17753篇
  2010年   10102篇
  2009年   8955篇
  2008年   15925篇
  2007年   17667篇
  2006年   17159篇
  2005年   16491篇
  2004年   16065篇
  2003年   15426篇
  2002年   14939篇
  2001年   22524篇
  2000年   23070篇
  1999年   19015篇
  1998年   5280篇
  1997年   4391篇
  1996年   4434篇
  1995年   4153篇
  1992年   14462篇
  1991年   15883篇
  1990年   16001篇
  1989年   15674篇
  1988年   14366篇
  1987年   14227篇
  1986年   13212篇
  1985年   12725篇
  1984年   9436篇
  1983年   8040篇
  1982年   4211篇
  1979年   8967篇
  1978年   6401篇
  1977年   5161篇
  1976年   5508篇
  1975年   6626篇
  1974年   7447篇
  1973年   7192篇
  1972年   6616篇
  1971年   6322篇
  1970年   5901篇
  1969年   5484篇
  1968年   5174篇
  1967年   4642篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Neuroscience and Behavioral Physiology - Objectives. To assess the severity of pain syndrome, emotional status, and quantitative levels of humoral serotonin in patients with cervical dystonia (CD)...  相似文献   
92.
Neuroscience and Behavioral Physiology - Objective. To study the association between single-nucleotide polymorphisms (SNP) of the RORA (rs1159814), CLOCK (rs12649507), PER3 (rs2640909), NPSR1...  相似文献   
93.
Neuroscience and Behavioral Physiology - Objective. To assess the dynamics of recovery of motor, speech, and autonomous functions in patients with ischemic stroke (IS) using music therapy....  相似文献   
94.
Neuroscience and Behavioral Physiology - One version of the optogenetic prosthetization of the degenerative retina is an approach based on creation of an ON/OFF receptive field for ganglion neurons...  相似文献   
95.
Neuroscience and Behavioral Physiology - Confocal microscopy was used to analyze double immunolabeling and provided evidence of the locations of a large number of tyrosine...  相似文献   
96.
Neuroscience and Behavioral Physiology - Human behavior in conditions of partial indeterminacy of the outcome is characterized by correspondence between the frequency of actions and the probability...  相似文献   
97.
Neuroscience and Behavioral Physiology - Objective: To study the characteristics of the expression of inducible NO synthase (iNOS) in hippocampal fields CA1 and CA3 in adult male humans and adult...  相似文献   
98.
Vanillylmandelic acid, a catecholamine end-metabolite, has been shown to have several biological properties in previous studies, despite considered biologically inactive. We examined the potential effects of vanillylmandelic acid on the ischemic heart following myocardial infarction and reperfusion on a rat model. Thirty-four female Wistar rats were randomized into two groups, control and experimental. They were anesthetized and subjected to myocardial infarction through left anterior descending artery ligation. A previously studied dose of vanillylmandelic acid (10 mg/kg) was administered and the following parameters were studied during ischemia and reperfusion: a) mortality b) severity of ventricular tachyarrhythmias c) premature ventricular contractions and d) heart rate. Administration of vanillymandelic acid significantly reduced the severity of ventricular tachyarrhythmias and mortality rate during reperfusion, while it did not affect any other of the parameters studied. In conclusion, reperfusion injury was blunted through vanillylmandelic acid administration, which seems to be mediated by parasympathetic activation.  相似文献   
99.
Damage‐sensing and healing are biological functions which are urgently required in structural health monitoring and remediation of engineering structures. The development of a bio‐inspired multiple cycle damage sensing and triggered healing magnet–polymer nanocomposite (Magpol) is reported. Magpol is comprised of an acrylonitrile butadiene co‐polymer (NBR) matrix and a magnetic nanoparticle (MNP) filler. Magpol nanocomposites in a range of MNP filler concentrations are studied. NBR is selected as the matrix due to its extensive use in industrial coatings, for example, in the automotive industry. Mn‐Zn ferrite MNP is chosen due to its appropriate Curie temperature and good specific absorption rate. Exposure of damaged Magpol to a remote external alternating magnetic field results in MNP heating. The MNP heats the surrounding NBR matrix, resulting in triggered healing. Fractured Magpol samples are successfully healed over several cycles. Incorporation of rhodamine b mechano‐chromophore in Magpol results in multicycle damage sensing by photo‐luminescent absorption. Thus, the developed Magpol is attractive for structural health monitoring and remediation application.  相似文献   
100.
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