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   220035篇
  免费   20262篇
  国内免费   15479篇
耳鼻咽喉   1907篇
儿科学   2191篇
妇产科学   2984篇
基础医学   26583篇
口腔科学   3684篇
临床医学   30832篇
内科学   32946篇
皮肤病学   2227篇
神经病学   12394篇
特种医学   8225篇
外国民族医学   138篇
外科学   21731篇
综合类   35417篇
现状与发展   56篇
一般理论   19篇
预防医学   13165篇
眼科学   6703篇
药学   22727篇
  195篇
中国医学   12390篇
肿瘤学   19262篇
  2024年   700篇
  2023年   3564篇
  2022年   9211篇
  2021年   11578篇
  2020年   8617篇
  2019年   7599篇
  2018年   8039篇
  2017年   7087篇
  2016年   6660篇
  2015年   10255篇
  2014年   12553篇
  2013年   10692篇
  2012年   16005篇
  2011年   17950篇
  2010年   10518篇
  2009年   8182篇
  2008年   11124篇
  2007年   11094篇
  2006年   11229篇
  2005年   11322篇
  2004年   6998篇
  2003年   6612篇
  2002年   5499篇
  2001年   4935篇
  2000年   5346篇
  1999年   5688篇
  1998年   3524篇
  1997年   3498篇
  1996年   2813篇
  1995年   2606篇
  1994年   2142篇
  1993年   1376篇
  1992年   1891篇
  1991年   1596篇
  1990年   1290篇
  1989年   1091篇
  1988年   1014篇
  1987年   890篇
  1986年   726篇
  1985年   525篇
  1984年   336篇
  1983年   242篇
  1982年   149篇
  1981年   145篇
  1980年   111篇
  1979年   142篇
  1978年   49篇
  1977年   53篇
  1975年   57篇
  1974年   56篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Abstract

Background

Comorbidities are commonly seen in patients with coronavirus disease 2019 (COVID-19), but the clinical implication is not yet well-delineated. We aim to characterize the prevalence and clinical implications of comorbidities in patients with COVID-19.  相似文献   
3.
4.
5.
ABSTRACT

Purpose

New instrument-based techniques for anterior chamber (AC) cell counting can offer automation and objectivity above clinician assessment. This review aims to identify such instruments and its correlation with clinician estimates.  相似文献   
6.
Objective: To report a case of labour induction during extracorporeal membrane oxygenation (ECMO) support in a patient with acute respiratory distress syndrome (ARDS) caused by influenza and review of the literature.

Methods: Case report and the literature search of all English articles on delivery while on ECMO in patients with ARDS caused by influenza.

Results: A 25-year-old pregnant woman was initiated with ECMO due to severe ARDS caused by influenza A (H1N1) virus. When the patient had symptoms of colporrhagia and uterine contractions, the medical team decided to start labour induction while on ECMO. There were in total five case reports identified. Maternal oxygenation was improved after delivery and ECMO was successfully discontinued.

Conclusions: Maternal oxygenation was improved after delivery, which may be beneficial to reduce the duration of ECMO. Caesarean section (CS) may be the most used mode and labour induction could be another option. The procedure should be performed by an experienced ECMO team, cooperating with the obstetrician, anaesthesiologist, and ICU doctors.  相似文献   

7.
8.
刘荣保 《护理研究》2006,20(21):1887-1887
在给病人使用化疗药物的过程中,护士不可避免地接触抗肿瘤药物,因而对自身健康产生危害。为了维护护士的健康,提高护理人员的防护意识,我们对肿瘤专科护士做一个防护调查,现将情况介绍如下。1临床资料与方法1.1临床资料选取山西省肿瘤医院临床一线,参加工作2年以上并经常接触化  相似文献   
9.
The objective of this study is to assess the efficacy and safety of herbal medicines (HMs), as a monotherapy or adjunct therapy, compared to placebo or conventional approaches in the treatment of idiopathic Parkinson's disease (PD). We conducted a systematic review of randomized controlled trials from both conventional and alternative medicine sources. Outcome measures were overall improvement, quality of life, reduction of levodopa dose, and adverse events. Nine studies were included, each testing a different HM. Six of the trials had limited internal validity due to major flaws in design, including the lack of proper randomization; insufficient blinding; unclear inclusive criteria in terms of diagnostic criteria, baseline staging, and duration of disease; lack of proper sample size calculation; and insufficient data analysis. Imbalances in gender and ethnicity among the patients in the included trials were observed. No major adverse events emerged, and no specific pattern was detected from the trials describing such data. In addition to major methodological defects, heterogeneity in (1) HM tested, (2) control treatment, and (3) outcome measure hindered in-depth data analysis and synthesis. Current evidence is insufficient to evaluate the efficacy and safety of various HMs. Further studies with improved trial design and reporting, with assessment on cost-effectiveness, quality of life, and qualitative data are warranted.  相似文献   
10.
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