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   531452篇
  免费   28479篇
  国内免费   493篇
耳鼻咽喉   6697篇
儿科学   16951篇
妇产科学   12619篇
基础医学   92958篇
口腔科学   12396篇
临床医学   48890篇
内科学   95679篇
皮肤病学   11874篇
神经病学   34110篇
特种医学   19793篇
外国民族医学   53篇
外科学   78345篇
综合类   7647篇
现状与发展   2篇
一般理论   107篇
预防医学   38812篇
眼科学   11948篇
药学   41590篇
  1篇
中国医学   1127篇
肿瘤学   28825篇
  2019年   3918篇
  2018年   5757篇
  2017年   4147篇
  2016年   4891篇
  2015年   5388篇
  2014年   7164篇
  2013年   10560篇
  2012年   15658篇
  2011年   17492篇
  2010年   10013篇
  2009年   8872篇
  2008年   15805篇
  2007年   17539篇
  2006年   17043篇
  2005年   16356篇
  2004年   15972篇
  2003年   15346篇
  2002年   14873篇
  2001年   22507篇
  2000年   23061篇
  1999年   19007篇
  1998年   5261篇
  1997年   4393篇
  1996年   4425篇
  1995年   4159篇
  1992年   14481篇
  1991年   15864篇
  1990年   15995篇
  1989年   15676篇
  1988年   14364篇
  1987年   14239篇
  1986年   13206篇
  1985年   12723篇
  1984年   9442篇
  1983年   8024篇
  1982年   4204篇
  1979年   8960篇
  1978年   6403篇
  1977年   5161篇
  1976年   5530篇
  1975年   6629篇
  1974年   7436篇
  1973年   7179篇
  1972年   6607篇
  1971年   6326篇
  1970年   5897篇
  1969年   5474篇
  1968年   5172篇
  1967年   4626篇
  1966年   3969篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Journal of Behavioral Medicine - Evidence supports the use of graphic warnings to educate the public about the health harms of smoking and suggests warnings eliciting negative emotional responses...  相似文献   
2.
The adrenal cortex gives rise to a biologically heterogenous group of neoplasms, each with a distinct morphology, antigen expression and molecular profile. Adrenal cortical adenomas have excellent prognosis and are usually cured by surgical resection alone, while adrenal cortical carcinomas are very aggressive tumors with a poor prognosis regardless of therapy. These tumors are rare and often challenging for a pathologist to diagnose, as significant overlap exists between benign and malignant lesions in some cases. In this review, we attempt to summarize most important histologic and clinical features of adrenal cortical adenomas and carcinomas, clarify the use of different grading systems, the use of special stains and the differential diagnosis for practicing pathologists. Most relevant hereditary syndromes associated with adrenal cortical tumors are listed. Updates in molecular alterations in adrenal cortical neoplasms and hyperplastic diseases as well as their clinical significance and potential therapeutic implications are also discussed.  相似文献   
3.
4.
5.
Gestational trophoblastic neoplasia (GTN) patients are treated according to the eight-variable International Federation of Gynaecology and Obstetrics (FIGO) scoring system, that aims to predict first-line single-agent chemotherapy resistance. FIGO is imperfect with one-third of low-risk patients developing disease resistance to first-line single-agent chemotherapy. We aimed to generate simplified models that improve upon FIGO. Logistic regression (LR) and multilayer perceptron (MLP) modelling (n = 4191) generated six models (M1-6). M1, all eight FIGO variables (scored data); M2, all eight FIGO variables (scored and raw data); M3, nonimaging variables (scored data); M4, nonimaging variables (scored and raw data); M5, imaging variables (scored data); and M6, pretreatment hCG (raw data) + imaging variables (scored data). Performance was compared to FIGO using true and false positive rates, positive and negative predictive values, diagnostic odds ratio, receiver operating characteristic (ROC) curves, Bland-Altman calibration plots, decision curve analysis and contingency tables. M1-6 were calibrated and outperformed FIGO on true positive rate and positive predictive value. Using LR and MLP, M1, M2 and M4 generated small improvements to the ROC curve and decision curve analysis. M3, M5 and M6 matched FIGO or performed less well. Compared to FIGO, most (excluding LR M4 and MLP M5) had significant discordance in patient classification (McNemar's test P < .05); 55-112 undertreated, 46-206 overtreated. Statistical modelling yielded only small gains over FIGO performance, arising through recategorisation of treatment-resistant patients, with a significant proportion of under/overtreatment as the available data have been used a priori to allocate primary chemotherapy. Streamlining FIGO should now be the focus.  相似文献   
6.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
7.
8.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
9.
Bulletin of Experimental Biology and Medicine - Ammonium, an end-product of catabolism, in low doses can promote adaptation of metabolic pathways in erythrocytes under conditions of extreme...  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