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   262131篇
  免费   12906篇
  国内免费   861篇
耳鼻咽喉   3410篇
儿科学   7061篇
妇产科学   5365篇
基础医学   36105篇
口腔科学   7675篇
临床医学   18989篇
内科学   57743篇
皮肤病学   6071篇
神经病学   22510篇
特种医学   7968篇
外国民族医学   2篇
外科学   35010篇
综合类   1587篇
一般理论   220篇
预防医学   26459篇
眼科学   6179篇
药学   18813篇
中国医学   811篇
肿瘤学   13920篇
  2023年   1637篇
  2022年   2216篇
  2021年   5918篇
  2020年   3310篇
  2019年   5832篇
  2018年   8174篇
  2017年   5370篇
  2016年   5539篇
  2015年   6189篇
  2014年   7819篇
  2013年   10925篇
  2012年   17571篇
  2011年   18311篇
  2010年   9571篇
  2009年   7682篇
  2008年   15027篇
  2007年   15430篇
  2006年   14848篇
  2005年   14415篇
  2004年   13209篇
  2003年   12290篇
  2002年   11441篇
  2001年   5606篇
  2000年   6020篇
  1999年   4921篇
  1998年   1697篇
  1997年   1250篇
  1996年   1080篇
  1995年   1012篇
  1992年   2636篇
  1991年   2357篇
  1990年   2305篇
  1989年   2009篇
  1988年   1912篇
  1987年   1790篇
  1986年   1864篇
  1985年   1746篇
  1984年   1403篇
  1983年   1212篇
  1979年   1368篇
  1978年   1000篇
  1975年   1014篇
  1974年   1261篇
  1973年   1286篇
  1972年   1220篇
  1971年   1180篇
  1970年   1076篇
  1969年   1142篇
  1968年   1160篇
  1967年   1013篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
This study of interprofessional work relations in a Canadian mental health team examines how nursing deployed different forms of power in order to alter the mental health division of labour, to gain administrative, organizational and content control over its own work, expand its jurisdictional boundaries by expropriating the work of other professionals, and exclude others from encroaching on its old and newly acquired jurisdictions. This is set against the context of nursing's long-standing professional project to consolidate and expand its professional jurisdiction. Using an ethnographic study of a single interprofessional mental health team in a psychiatric hospital in Canada, the paper attempts to understand the politics and paradoxes involved in realizing nursing's professional project and how the politics of professional autonomy and professional dominance are actually conducted through micro-political struggles. The data demonstrates the effects of the political struggles at the organizational and work process levels, particularly in the forms of collaboration that result. Nurses gained substantial autonomy from medical domination and secured practical dominion over the work of non-medical professionals. New forms of interprofessional collaboration were accomplished through both simultaneous and sequential micro-political struggles with psychiatrists and non-medical professionals, and the formation of political alliances and informal agreements. Nursing solidarity at the elite level and substantial effort by the elite nurses and their committed colleagues to mobilize their less enthused members were fundamental to their success. The nurses deployed political (power) strategies and tactics to organize and reorganize themselves and other professionals on multiple levels (politically, organizationally, ideologically, socially and culturally). This study reveals the complexity and robustness of micro-political dynamics in the constitution of professional and collaborative interprofessional work relations.  相似文献   
73.
74.
Background and objectiveTo analyse frequency, characteristics and patient survival with lung cancer (LC) and Common Obstructive Pulmonary Disease (COPD), comparing them with patients that do not have COPD.Material and methodsA retrospective study, of patients diagnosed by means of cytohistology. Survival was estimated by the Kaplan-Meier method. Statistical analysis was carried out using SPSS 15.0.ResultsA total of 996 patients were diagnosed, 39.8% with COPD. Mean age70±9.19 years. GOLD stages: I 18.2%, II 53.6%, III 24%, IV 4.2%. The histological types: squamous cell carcinoma 48.2%, adenocarcinoma 22%, and small cell carcinoma 22.5%. Survival was longer in the COPD group.ConclusionsLC and COPD are combined in 39.8%. Squamous cell type is more frequent and survival was longer in the COPD group.  相似文献   
75.
76.
77.
BACKGROUND: The HOXA1 gene plays a major role in brainstem and cranial morphogenesis. The G allele of the HOXA1 A218G polymorphism has been previously found associated with autism. METHODS: We performed case-control and family-based association analyses, contrasting 127 autistic patients with 174 ethnically matched controls, and assessing for allelic transmission disequilibrium in 189 complete trios. RESULTS: A, and not G, alleles were associated with autism using both case-control (chi(2) = 8.96 and 5.71, 1 df, p <.005 and <.025 for genotypes and alleles, respectively), and family-based (transmission/disequilibrium test chi(2) = 8.80, 1 df, p <.005) association analyses. The head circumference of 31 patients carrying one or two copies of the G allele displayed significantly larger median values (95.0th vs. 82.5th percentile, p <.05) and dramatically reduced interindividual variability (p <.0001), compared with 166 patients carrying the A/A genotype. CONCLUSIONS: The HOXA1 A218G polymorphism explains approximately 5% of the variance in the head circumference of autistic patients and represents to our knowledge the first known gene variant providing sizable contributions to cranial morphology. The disease specificity of this finding is currently being investigated. Nonreplications in genetic linkage/association studies could partly stem from the dyshomogeneous distribution of an endophenotype morphologically defined by cranial circumference.  相似文献   
78.
79.
Nurses must frequently make ethical decisions. These decisions require judgment, knowledge, and skills. This article will provide one framework for ethical decision making and provide several examples of the process.  相似文献   
80.
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