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   8276篇
  免费   808篇
  国内免费   9篇
耳鼻咽喉   51篇
儿科学   229篇
妇产科学   158篇
基础医学   1077篇
口腔科学   117篇
临床医学   923篇
内科学   1648篇
皮肤病学   90篇
神经病学   660篇
特种医学   282篇
外科学   1604篇
综合类   202篇
一般理论   26篇
预防医学   847篇
眼科学   72篇
药学   554篇
中国医学   51篇
肿瘤学   502篇
  2023年   54篇
  2021年   124篇
  2020年   119篇
  2019年   172篇
  2018年   198篇
  2017年   147篇
  2016年   161篇
  2015年   152篇
  2014年   233篇
  2013年   344篇
  2012年   527篇
  2011年   506篇
  2010年   272篇
  2009年   260篇
  2008年   483篇
  2007年   439篇
  2006年   398篇
  2005年   436篇
  2004年   387篇
  2003年   331篇
  2002年   318篇
  2001年   236篇
  2000年   256篇
  1999年   202篇
  1998年   86篇
  1997年   77篇
  1996年   92篇
  1995年   69篇
  1994年   80篇
  1993年   70篇
  1992年   124篇
  1991年   153篇
  1990年   104篇
  1989年   103篇
  1988年   122篇
  1987年   145篇
  1986年   124篇
  1985年   107篇
  1984年   68篇
  1983年   59篇
  1982年   42篇
  1981年   38篇
  1980年   47篇
  1979年   68篇
  1978年   46篇
  1977年   54篇
  1976年   38篇
  1975年   40篇
  1974年   49篇
  1972年   42篇
排序方式: 共有9093条查询结果,搜索用时 15 毫秒
1.
The UK has low breastfeeding rates, with socioeconomic disparities. The Assets‐based feeding help Before and After birth (ABA) intervention was designed to be inclusive and improve infant feeding behaviours. ABA is underpinned by the behaviour change wheel and offers an assets‐based approach focusing on positive capabilities of individuals and communities, including use of a Genogram. This study aimed to investigate feasibility of intervention delivery within a randomised controlled trial (RCT). Nulliparous women ≥16 years, (n = 103) from two English sites were recruited and randomised to either intervention or usual care. The intervention – delivered through face‐to‐face, telephone and text message by trained Infant Feeding Helpers (IFHs) – ran from 30‐weeks' gestation until 5‐months postnatal. Outcomes included recruitment rates and follow‐up at 3‐days, 8‐weeks and 6‐months postnatal, with collection of future full trial outcomes via questionnaires. A mixed‐methods process evaluation included qualitative interviews with 30 women, 13 IFHs and 17 maternity providers; IFH contact logs; and fidelity checking of antenatal contact recordings. This study successfully recruited women, including teenagers, from socioeconomically disadvantaged areas; postnatal follow‐up rates were 68.0%, 85.4% and 80.6% at 3‐days, 8‐weeks and 6‐months respectively. Breastfeeding at 8‐weeks was obtained for 95.1% using routine data for non‐responders. It was possible to recruit and train peer supporters to deliver the intervention with adequate fidelity. The ABA intervention was acceptable to women, IFHs and maternity services. There was minimal contamination and no evidence of intervention‐related harm. In conclusion, the intervention is feasible to deliver within an RCT, and a definitive trial required.  相似文献   
2.
3.
4.
5.
Rhinovirus (RV) infections are linked to the development and exacerbation of allergic diseases including allergic asthma. IgE, another contributor to atopic disease pathogenesis, has been shown to regulate DC antiviral functions and influence T cell priming by monocytes. We previously demonstrated that IgE-mediated stimulation of monocytes alters multiple cellular functions including cytokine secretion, phagocytosis, and influenza-induced Th1 development. In this study, we investigate the effects of IgE-mediated stimulation on monocyte-driven, RV-induced T cell development utilizing primary human monocyte-T cell co-cultures. We demonstrate that IgE crosslinking of RV-exposed monocytes enhances monocyte-driven Th2 differentiation. This increase in RV-induced Th2 development was regulated by IgE-mediated inhibition of virus-induced type I IFN and induction of IL-10. These findings suggest an additional mechanism by which two clinically significant risk factors for allergic disease exacerbations—IgE-mediated stimulation and rhinovirus infection—may synergistically promote Th2 differentiation and allergic inflammation.  相似文献   
6.
7.
On September 11, 2001 two hijacked airplanes struck the Twin Towers at the World Trade Center in New York City. All of the remains (19,915) were examined by the Office of Chief Medical Examiner (OCME) of New York City. The major goals of the OCME were to accurately identify the decedents and to promptly issue death certificates. As of September 2005, there were 1594 identifications of a total of 2749 people reported missing. Of these, 976 were identified by a single means, which included DNA analysis in 852 of the victims. Use of legal statues can assist in the timely issuance of death certificates in mass fatalities, which benefit surviving family members. DNA analysis markedly improves the ability to identify remains and has become the standard method for identification in these types of disasters. Certain postmortem tissue samples are better suited for DNA analysis and yield better results than others.  相似文献   
8.
9.
10.
The current experience of a high dependency unit established 5 years ago for the postoperative care of high-risk patients undergoing surgery is reported. The resource implications and contributions to the safety and quality of post-operative care, particularly pain relief, are described.  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