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   65552篇
  免费   7066篇
  国内免费   1241篇
耳鼻咽喉   287篇
儿科学   1707篇
妇产科学   1592篇
基础医学   4591篇
口腔科学   1371篇
临床医学   8406篇
内科学   11717篇
皮肤病学   752篇
神经病学   4909篇
特种医学   1969篇
外国民族医学   1篇
外科学   6054篇
综合类   7162篇
现状与发展   8篇
一般理论   10篇
预防医学   11705篇
眼科学   990篇
药学   5472篇
  39篇
中国医学   893篇
肿瘤学   4224篇
  2024年   185篇
  2023年   1396篇
  2022年   2214篇
  2021年   3420篇
  2020年   3301篇
  2019年   3033篇
  2018年   2999篇
  2017年   2944篇
  2016年   3018篇
  2015年   2714篇
  2014年   4831篇
  2013年   6151篇
  2012年   3941篇
  2011年   4116篇
  2010年   3173篇
  2009年   2968篇
  2008年   3015篇
  2007年   2771篇
  2006年   2565篇
  2005年   2174篇
  2004年   1781篇
  2003年   1507篇
  2002年   1291篇
  2001年   1122篇
  2000年   928篇
  1999年   791篇
  1998年   688篇
  1997年   625篇
  1996年   508篇
  1995年   471篇
  1994年   364篇
  1993年   360篇
  1992年   292篇
  1991年   251篇
  1990年   210篇
  1989年   195篇
  1988年   176篇
  1987年   148篇
  1986年   139篇
  1985年   197篇
  1984年   156篇
  1983年   88篇
  1982年   127篇
  1981年   110篇
  1980年   100篇
  1979年   80篇
  1978年   52篇
  1977年   53篇
  1976年   44篇
  1975年   28篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
981.
In August 2008, after 10 years of apparent silence, West Nile virus (WNV) infection re‐emerged in northern Italy, spreading through the territories of three regions. In the following years, new cases occurred in the same area and additional foci of infection were observed in central and southern Italy, involving also Sicily and Sardinia islands. The Italian Ministry of Health ordered to test by RT‐PCR all blood and organ donors from 15th June to 15th November of each year in the infected areas. The period at risk of WNV transmission was defined on the basis of literature data, but a more scientific estimation of the transmission season, under Italian circumstances, needs to be performed. A transitional model previously developed by other Authors was applied and adapted to Italian circumstances, to describe and quantify the WNV transmission cycle between birds and mosquitoes. Culex spp. was considered the main vector, and mosquito parameters were adapted to this genus. Magpies (Pica pica) were considered the main bird host. The model was partially validated through the results of the entomological surveys carried out in central Italy and in Po Valley. The results of the transitional model permitted to calculate the basic reproduction number (R0) during 2010 for the whole Italian territory at 1 km of spatial resolution, estimating the risk of WNV transmission during the year and creating detailed risk maps for Italy. The mean values of R0 for the whole Italy varied between 0.4 and 4.8, with values >1 from the end of May to the middle of September. The coastal and flat zones of Italy showed the highest R0 values. Although partially validated, the model showed a substantial acceptable capacity of defining the period at major risk of WNV transmission in Italy, helping Public health authorities in the application of appropriate and timely control and preventive measures.  相似文献   
982.
983.
984.
BackgroundWe aimed at assessing familial risk of melanoma by considering a detailed family history of multiple primary (invasive/in situ) melanomas (MPM), stratified by histology and location.MethodsAmong 65,429 melanoma patients diagnosed in 1958–2010 in the Swedish Family-Cancer Database, there were 4248 patients with familial melanoma. A detailed family history of MPM was investigated by number of melanomas in one first-degree relative (FDR) and in ⩾2 FDRs. Familial melanoma risk was assessed by standardised incidence ratios (SIRs) comparing those with family history of melanoma to those without. Combining invasive/in situ melanoma was due to essentially identical familial risks.ResultsFor one affected FDR, familial risk increased from SIR = 2.2 (95% confidence interval (CI) = 2.2–2.3) for single melanoma to 16.3 (9.5–26.1) for ⩾5 melanomas, while for ⩾2 affected FDRs, the risk increased from 5.5 (4.8–6.2) for single melanoma to 23.9 (13.6–38.8) for ⩾2 melanomas. Significantly higher familial risks for superficial spreading melanoma (SSM) [2.5 (2.3–2.6)] than lentigo maligna melanoma (LMM) [1.8 (1.6–2.1)], and for multiple parts [5.3 (3.1–8.4)] and trunk [2.6 (2.5–2.8)] than head/neck [2.0 (1.8–2.2)] were observed. Only at head/neck, significantly higher risk for SSM [2.4 (1.9–3.0)] than LMM [1.6 (1.4–1.8)] was noted.ConclusionWe found, for the first time, that familial risks were similar for two/three melanomas in one FDR or for a single melanoma in ⩾2 FDRs and, higher familial risks for SSM than LMM occurred only at head/neck. This study provides new evidence for genetic counselling in melanoma, suggesting the need for considering not only the number of affected family members but also the diagnosis of MPM (even in situ) in relatives.  相似文献   
985.
986.
This article examines the nature of offender rehabilitation and briefly reviews the effectiveness of correctional interventions in reducing recidivism. It then outlines the two most prominent contemporary theories of offender rehabilitation: the Risk-Need-Responsivity Model and the Good Lives Model (GLM). Our aim is to introduce these two broad rehabilitation frameworks and analyse their practice implications. We conclude that the GLM can offer an alternative view of offender rehabilitation that seeks to help offenders live more fulfilling lives while also reducing risk.  相似文献   
987.
An analysis is made of the controversial application of the theory of disproportionate damage in the anaesthetic act, due to the high inherent risk, and regardless of the seriousness and importance of the surgery being performed. The existence of a disproportionate damage, that is, damage not foreseen nor accountable within the framework of the professional performance of the anaesthetist, does not by itself determine the existence of liability on the part of the anaesthetist, but the demand from the professionals themselves for a coherent explanation of the serious disagreement between the initial risk implied by their actions and the final consequence produced.  相似文献   
988.
目的研究胰十二指肠切除术后出现胰瘘的危险因素及护理对策。方法回顾分析本院普外科收治的70例接受胰十二指肠切除术患者的临床资料,观察胰瘘情况及其治疗情况,并分析其发生原因并制定相应护理对策。结果胰腺质地、糖尿病、高血压均为导致胰瘘的独立危险因素。遵医嘱对本组出现胰瘘患者进行抗生素用药处理,采用抑制胰液分泌的药物控制病情发展,患者在用药1周后引流液逐渐变少,2周后患者均康复出院,患者生存质量评分各项指标较好。结论临床针对胰瘘患者术后制定相应护理干预措施并做好并发症预防工作,并积极分析胰瘘危险因素,患者治疗效果较好且生存质量评分较高。  相似文献   
989.
990.
Human exposure to and contamination by environmental toxic compounds generates discourses and practices that merit greater attention. In this article, we assess internal chemical contamination and the risk of toxic effects as an experience related to the production of meaning in everyday life. Drawing on the analysis of semantic networks of narratives from semi-structured interviews conducted with 43 informants in Catalonia, Spain, we consider participants’ perceptions of the health risks of toxic compounds, including social discourses on exposure, toxicity, and internal chemical contamination, and on responsibilities, consequences, and proposed strategies for controlling toxic compounds. Informants’ narratives on the relationships between nature and nurture suggest that they no longer perceive rigid boundaries separating the human body from the external environment and its chemical pollutants.  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