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   2638810篇
  免费   189441篇
  国内免费   7523篇
耳鼻咽喉   34811篇
儿科学   87529篇
妇产科学   72657篇
基础医学   369081篇
口腔科学   69982篇
临床医学   237396篇
内科学   525600篇
皮肤病学   62756篇
神经病学   219152篇
特种医学   103128篇
外国民族医学   736篇
外科学   397522篇
综合类   50812篇
现状与发展   5篇
一般理论   967篇
预防医学   200792篇
眼科学   57224篇
药学   191164篇
  8篇
中国医学   5157篇
肿瘤学   149295篇
  2019年   20626篇
  2018年   37457篇
  2017年   29163篇
  2016年   34167篇
  2015年   29820篇
  2014年   40668篇
  2013年   60620篇
  2012年   82574篇
  2011年   91995篇
  2010年   57151篇
  2009年   53505篇
  2008年   86670篇
  2007年   93197篇
  2006年   85757篇
  2005年   83394篇
  2004年   80689篇
  2003年   78672篇
  2002年   74994篇
  2001年   128419篇
  2000年   131381篇
  1999年   109946篇
  1998年   29761篇
  1997年   26395篇
  1996年   26545篇
  1995年   27359篇
  1994年   25083篇
  1993年   23401篇
  1992年   85165篇
  1991年   81673篇
  1990年   78853篇
  1989年   76104篇
  1988年   69492篇
  1987年   68049篇
  1986年   63582篇
  1985年   60564篇
  1984年   44934篇
  1983年   37900篇
  1982年   22448篇
  1981年   19914篇
  1979年   38983篇
  1978年   27426篇
  1977年   23180篇
  1976年   21473篇
  1975年   22758篇
  1974年   26766篇
  1973年   25341篇
  1972年   23731篇
  1971年   21934篇
  1970年   20180篇
  1969年   19438篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
62.
63.
ObjectivesA suicide attempt (SA) is a major risk factor of recurrent SA in adolescence and may be associated with psychological or social problems in the future. REPEATERS is a longitudinal study which examines the long-term psychosocial outcome of adolescents following attempted suicide. It focuses on the impact of early recurrence (i.e., within the first year of the index SA) – data which is, in fact, poorly documented.MethodsTen years after the index SA, a self-reporting questionnaire was sent to all adolescents who had attempted suicide and were followed up by the CHRU (Regional University Hospital Centre) de Nancy, France, between 1994 and 2003 and their parents. The purpose of this questionnaire was to assess psychosocial outcomes. Data concerning SA were collected retrospectively.ResultsAfter ten years, 146 of the 309 adolescents who had attempted suicide and were participating in the study had responded: 90% lived with a partner and 41% had children. The mean (SD) current emotional life of suicide attempt survivors scored 7.3 (2.3) on a scale of 0 to 10. Compared to the general population of the same age, responders felt more depressed than their peers (29% vs. less than 8% of males and 20% of females), had more suicidal thoughts (14% vs. 5%), and had more SAs (27% vs. 0.3%). Moreover, the risk of recurrence over the ten year period was associated with suicide recurrence in the first year after the index SA (odds ratio [OR] = 2.3; 95% confidence interval [CI] = 1.1–4.9) and with a lower level of education at ten years (OR = 0.37; 95% CI = 0.19–0.45).ConclusionsAlthough a favorable outcome was reported ten years after the event for the majority of adolescents who had attempted suicide, some with a lower level of education were nevertheless at increased risk of recurrence and depression. Post-intervention strategies are therefore essential in order to evaluate risk factors which may persist if not taken into consideration.  相似文献   
64.
Collagens are the most abundant proteins in the extracellular matrix. They provide a framework to build organs and tissues and give structural support to make them resistant to mechanical load and forces. Several intra‐ and extracellular modifications are needed to make functional collagen molecules, intracellular post‐translational modifications of proline and lysine residues having key roles in this. In this article, we provide a review on the enzymes responsible for the proline and lysine modifications, that is collagen prolyl 4‐hydroxylases, 3‐hydroxylases and lysyl hydroxylases, and discuss their biological functions and involvement in diseases.  相似文献   
65.
66.
Abstract

Purpose

Financial hardship can be a major cause of distress among persons with cancer, resulting in chronic stress and impacting physical and emotional health. This paper provides an analysis of the lived experience of cancer patients’ financial hardship from diagnosis to post-treatment.  相似文献   
67.
Background The B-MaP-C study aimed to determine alterations to breast cancer (BC) management during the peak transmission period of the UK COVID-19 pandemic and the potential impact of these treatment decisions.Methods This was a national cohort study of patients with early BC undergoing multidisciplinary team (MDT)-guided treatment recommendations during the pandemic, designated ‘standard’ or ‘COVID-altered’, in the preoperative, operative and post-operative setting.Findings Of 3776 patients (from 64 UK units) in the study, 2246 (59%) had ‘COVID-altered’ management. ‘Bridging’ endocrine therapy was used (n = 951) where theatre capacity was reduced. There was increasing access to COVID-19 low-risk theatres during the study period (59%). In line with national guidance, immediate breast reconstruction was avoided (n = 299). Where adjuvant chemotherapy was omitted (n = 81), the median benefit was only 3% (IQR 2–9%) using ‘NHS Predict’. There was the rapid adoption of new evidence-based hypofractionated radiotherapy (n = 781, from 46 units). Only 14 patients (1%) tested positive for SARS-CoV-2 during their treatment journey.Conclusions The majority of ‘COVID-altered’ management decisions were largely in line with pre-COVID evidence-based guidelines, implying that breast cancer survival outcomes are unlikely to be negatively impacted by the pandemic. However, in this study, the potential impact of delays to BC presentation or diagnosis remains unknown.Subject terms: Breast cancer, Surgical oncology, Health care economics, Quality of life, Health policy  相似文献   
68.
69.
70.
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