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   33977篇
  免费   3197篇
  国内免费   2159篇
耳鼻咽喉   234篇
儿科学   532篇
妇产科学   411篇
基础医学   3914篇
口腔科学   775篇
临床医学   4423篇
内科学   5208篇
皮肤病学   336篇
神经病学   1769篇
特种医学   1441篇
外国民族医学   13篇
外科学   3913篇
综合类   5016篇
现状与发展   7篇
一般理论   4篇
预防医学   2365篇
眼科学   741篇
药学   3444篇
  39篇
中国医学   1731篇
肿瘤学   3017篇
  2024年   392篇
  2023年   669篇
  2022年   1245篇
  2021年   1552篇
  2020年   1210篇
  2019年   1012篇
  2018年   1061篇
  2017年   992篇
  2016年   1017篇
  2015年   1410篇
  2014年   1706篇
  2013年   1606篇
  2012年   2095篇
  2011年   2486篇
  2010年   1587篇
  2009年   1234篇
  2008年   1645篇
  2007年   1734篇
  2006年   1662篇
  2005年   1630篇
  2004年   1267篇
  2003年   1256篇
  2002年   1150篇
  2001年   966篇
  2000年   932篇
  1999年   861篇
  1998年   469篇
  1997年   524篇
  1996年   361篇
  1995年   335篇
  1994年   259篇
  1993年   225篇
  1992年   325篇
  1991年   312篇
  1990年   291篇
  1989年   253篇
  1988年   202篇
  1987年   181篇
  1986年   170篇
  1985年   137篇
  1984年   97篇
  1983年   72篇
  1981年   47篇
  1980年   53篇
  1979年   82篇
  1978年   67篇
  1977年   38篇
  1974年   53篇
  1973年   42篇
  1972年   37篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Abstract

Purpose: We examined underlying psychosocial processes of a behavioral treatment for urinary incontinence (UI) of prostate cancer survivors.

Design: Secondary analysis of data collected from a clinical trial.

Sample: Two hundred forty-four prostate cancer survivors who participated in a clinical trial of behavioral intervention to UI as intervention or control subjects.

Methods: The participants had a 3-month behavioral intervention or usual care and were followed up for an additional 3?months. They were assessed at baseline, 3, and 6?months. Latent growth curve models were performed to examine trajectories of each study variable and relationships among the variables.

Findings: Increasing self-efficacy and social support were significantly and independently associated with more reduction of urinary leakage frequency over time.

Implications for psychosocial oncology: Providing problem-solving skills and social support, including peer support, are essential for empowering patients to reduce UI.  相似文献   
2.
3.
This review focuses on selected areas that should interest both the scientist and the clinician alike: polymorphisms within the factor VIII and factor IX genes, their linkage, and their ethnic variation; a general assessment of mutations within both genes and a detailed inspection of the molecular pathology of certain mutations to illustrate the diverse cause–effect relations that exist; a summary of current knowledge on molecular aspects of inhibitor production; and an introduction to the new areas of factor VIII and factor IX catabolism. An appendix defining various terms encountered in the molecular genetics of the haemophilias is included, together with an appendix providing accession numbers and locus identification links for accessing gene and sequence information in the international nucleic acid databases.  相似文献   
4.
Cancer Chemotherapy and Pharmacology - Addition of solid doxorubicin or solutions to pre-formed liposomes proved to be the optimal method for incorporating the drug into liposomes whilst...  相似文献   
5.
6.
7.
8.
M K Fu 《中华口腔医学杂志》1992,27(6):354-5, 385
This system is composed of: (1) a perspective table, (2) TV camera, (3) a high-resolution image displayer, (4) a computer, (5) a laser printer The functions of this system are as follows: (1) It can perform cephalometries directly from image of X-ray film, (2) it can diagnose and analyse the deformity and provide treatment plan. This system is valuable for orthodontics and surgical orthodontics.  相似文献   
9.
Lesbianism in China has a long but usually hidden history. This paper examines the historical and literary sources of the past to illustrate the history of lesbianism and then turns to a survey of lesbianism in the China of today. As in the past, lesbianism remains more or less hidden, and comes to light only occasionally. Data for contemporary China comes from a visit to an institution for delinquent young women, recent police records, and contemporary fiction. It has only been in the past 4 or 5 years that it was possible to talk about lesbianism and most lesbians are fearful of becoming identified.  相似文献   
10.
Background: Investigators in the authors' laboratory previously established the critical participation of the cerulospinal noradrenergic pathway in muscular rigidity elicited by fentanyl. The identification of colocalization of glutamate with tyrosine hydroxylase in most locus ceruleus neurons suggests a role for cerulospinal glutamatergic neurotransmission in fentanyl-induced muscular rigidity. This suggestion and the subtype(s) of glutamate receptors involved were investigated here.

Methods: Electromyographic signals activated by bilateral microinjection of 2.5 micro gram fentanyl into the locus ceruleus were recorded differentially from the left sacrococcygeus dorsi lateralis muscle of adult male Sprague-Dawley rats. The effect of intrathecal administration at the lower lumbar spinal cord of various N-methyl-D-aspartate (NMDA) and non-NMDA receptor antagonists or agonists on this index of muscular rigidity was studied. Rats were under mechanical ventilation, and intravenous infusion of ketamine (30 mg [center dot] kg sup -1 [center dot] h sup -1) was maintained until 10 min before fentanyl was administered.

Results: Microinjection of fentanyl bilaterally into the locus ceruleus increased the root mean square and decreased the mean power frequency values of electromyographic signals. The efficacy of fentanyl to elicit muscular rigidity in this manner was significantly reduced by previous intrathecal administration of either 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX), (+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5,10-imine maleate (MK-801), D-(-)-2-amino-5-phosphonovaleric acid (AP5), or (+/- (CPP). Intrathecal administration of kainic acid or NMDA also resulted in significant electromyographic activation.  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