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   178934篇
  免费   1265篇
  国内免费   72篇
耳鼻咽喉   1150篇
儿科学   6660篇
妇产科学   3081篇
基础医学   17262篇
口腔科学   1591篇
临床医学   12644篇
内科学   31386篇
皮肤病学   756篇
神经病学   16739篇
特种医学   9157篇
外科学   29289篇
综合类   2314篇
一般理论   2篇
预防医学   18143篇
眼科学   2935篇
药学   9797篇
中国医学   672篇
肿瘤学   16693篇
  2022年   83篇
  2021年   173篇
  2020年   75篇
  2019年   157篇
  2018年   22058篇
  2017年   17478篇
  2016年   19667篇
  2015年   1155篇
  2014年   1084篇
  2013年   1052篇
  2012年   7334篇
  2011年   21374篇
  2010年   19050篇
  2009年   11698篇
  2008年   19714篇
  2007年   21888篇
  2006年   707篇
  2005年   2345篇
  2004年   3454篇
  2003年   4416篇
  2002年   2551篇
  2001年   282篇
  2000年   423篇
  1999年   172篇
  1998年   208篇
  1997年   210篇
  1996年   100篇
  1995年   111篇
  1994年   101篇
  1993年   61篇
  1992年   42篇
  1991年   94篇
  1990年   127篇
  1989年   81篇
  1988年   57篇
  1987年   44篇
  1986年   28篇
  1985年   34篇
  1984年   21篇
  1983年   21篇
  1982年   24篇
  1980年   42篇
  1974年   27篇
  1939年   20篇
  1938年   60篇
  1937年   25篇
  1935年   22篇
  1934年   30篇
  1932年   56篇
  1930年   46篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
The specific characteristics of genetic data lead to ethical-legal conflicts in the framework of genetic diagnosis. Several international organisations, including UNESCO and the Council of Europe, have enacted rules referring to the use of genetic information. This paper discusses possible legal and ethical criteria that could be used in genetic testing.  相似文献   
43.
The aim of this research was to assess whether common genetic variants within the C-reactive protein gene ( CRP ) are related to the degree of acute rise in plasma C-reactive protein (CRP) levels following an acute coronary syndrome (ACS). While polymorphisms within CRP are associated with basal CRP levels in healthy men and women, less is known about the relationship of such genetic variants and the degree of CRP rise during and after acute ischemia. Plasma CRP is associated with increased rates of recurrent coronary events. We evaluated seven common genetic variants within CRP and assessed their relationship to the degree of rise in CRP levels immediately following an acute coronary syndrome in 1827 European American patients. Variants in the putative promoter region, −757T > C and −286C > T > A, were associated with the highest CRP elevations after ACS. Patients with two copies of the A allele of SNP −286C > T > A had median CRP values of 76.6 mg/L, compared to 11.1 mg/L in patients with no copies of the rare variant (p-value <0.0001), post ACS. The lowest CRP values were found for patients with minor alleles of the exonic 1059G > C and the 3'untranslated region 1846G > A SNPs. For example, patients homozygous for the minor allele of 1059G > C had 71% lower median CRP values than those homozygous for the major allele [3.5 vs 12.0 mg/L, p < 0.0001]. These trends persisted in the chronic stable phase after ischemia had resolved, and after adjustment for infarct size by peak creatinine kinase levels and clinical status by Killip class. Assessment of CRP genetic variants identified patients with higher and lower CRP elevation after acute coronary syndrome.  相似文献   
44.
45.

Introduction  

This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning.  相似文献   
46.
47.
48.

Introduction  

Although ependymoma is the third most common pediatric brain tumor, we know little about the genetic/epigenetic basis of its initiation, maintenance, or progression. This is due in part to the heterogeneity of the disease, as well as the small sample size of the cohorts analyzed in most studies.  相似文献   
49.
50.
A benign esophageal leiomyoma with abnormally increased fluorine-18-fluorodeoxyglucose uptake on positron emission tomography (PET) was resected thoracoscopically. The tumor, of which the maximum standardized uptake value of the lesion was 4.7, was well defined and 38 mm in diameter. Neither mitotic activity nor degeneration was found histologically; and immunoreactivity for CD34, CD117, MIB-1, and glucose transporter-1 was negative immunohistochemically. A diagnosis of gastrointestinal stromal tumor was ruled out by an oncogenic kinase gene mutation study. This case cautions against PET-dependent evaluation for malignant potential of esophageal submucosal tumors.  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