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   51141篇
  免费   3937篇
  国内免费   123篇
耳鼻咽喉   409篇
儿科学   2172篇
妇产科学   1501篇
基础医学   6971篇
口腔科学   541篇
临床医学   6795篇
内科学   9699篇
皮肤病学   860篇
神经病学   5001篇
特种医学   1046篇
外国民族医学   38篇
外科学   4819篇
综合类   521篇
一般理论   100篇
预防医学   7335篇
眼科学   720篇
药学   2746篇
中国医学   98篇
肿瘤学   3829篇
  2024年   77篇
  2023年   517篇
  2022年   770篇
  2021年   1608篇
  2020年   973篇
  2019年   1537篇
  2018年   1767篇
  2017年   1286篇
  2016年   1356篇
  2015年   1437篇
  2014年   2024篇
  2013年   2916篇
  2012年   4106篇
  2011年   4268篇
  2010年   2256篇
  2009年   1970篇
  2008年   3516篇
  2007年   3464篇
  2006年   3229篇
  2005年   3126篇
  2004年   2839篇
  2003年   2545篇
  2002年   2380篇
  2001年   321篇
  2000年   203篇
  1999年   323篇
  1998年   476篇
  1997年   357篇
  1996年   302篇
  1995年   310篇
  1994年   261篇
  1993年   231篇
  1992年   142篇
  1991年   142篇
  1990年   120篇
  1989年   106篇
  1988年   117篇
  1987年   82篇
  1986年   97篇
  1985年   107篇
  1984年   125篇
  1983年   105篇
  1982年   125篇
  1981年   159篇
  1980年   106篇
  1979年   65篇
  1978年   58篇
  1977年   62篇
  1976年   58篇
  1974年   55篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
Early diagnosis of potentially life‐threatening autoimmune polyendocrinopathy‐candidiasis‐ectodermal dystrophy (APECED) is crucial, but is often delayed due to the clinical heterogeneity of the disorder. Even in the absence of the classic disease triad of chronic mucocutaneous candidiasis, hypoparathyroidism, and adrenocortical insufficiency, a diagnosis of APECED should be considered in children who have hypoparathyroidism and chronic keratitis, with a past medical history showing a mild and transient Candida infection.  相似文献   
982.
983.
984.
985.
While cognitive-behavioral therapy for hoarding disorder (HD) has resulted in significant reductions in symptoms, most individuals continue to have significant hoarding symptoms following treatment. This investigation sought to extend the literature on the behavioral treatments for hoarding by examining (1) group cognitive rehabilitation and exposure/sorting therapy (CREST) and (2) group exposure therapy (ET) for hoarding. Participants in both studies reported significant decreases in hoarding symptom severity from baseline to post-treatment on all primary outcome measures using mixed-effects linear regression models with the intent to treat sample. Participants who received group CREST reported statistically significant reductions in anxiety, depression, and overall severity at post-treatment, while participants who received group ET did not. Results provide preliminary evidence for both group CREST and group ET as effective treatments for hoarding disorder.  相似文献   
986.

Objective

To determine whether a powered ankle-foot orthosis (AFO) that provides dorsiflexor and plantar flexor assistance at the ankle can improve walking endurance of persons with multiple sclerosis (MS).

Design

Short-term intervention.

Setting

University research laboratory.

Participants

Participants (N=16) with a neurologist-confirmed diagnosis of MS and daily use of a prescribed custom unilateral passive AFO.

Interventions

Three 6-minute walk tests (6MWTs), 1 per footwear condition: shoes (no AFO), prescribed passive AFO, and portable powered AFO (PPAFO). Assistive devices were worn on the impaired limb.

Main Outcome Measures

Distance walked and metabolic cost of transport were recorded during each 6MWT and compared between footwear conditions.

Results

Each participant completed all three 6MWTs within the experimental design. PPAFO use resulted in a shorter 6MWT distance than did a passive AFO or shoe use. No differences were observed in metabolic cost of transport between footwear conditions.

Conclusions

The current embodiment of this PPAFO did not improve endurance walking performance during the 6MWT in a sample of participants with gait impairment due to MS. Further research is required to determine whether expanded training or modified design of this powered orthosis can be effective in improving endurance walking performance in persons with gait impairment due to MS.  相似文献   
987.
988.
989.
990.

Purpose

Frail patients are known to experience poor outcomes. Nevertheless, we know less about how frailty manifests itself in patients’ physiology during critical illness and how it affects resource use in intensive care units (ICU). We aimed to assess the association of frailty with short-term outcomes and organ support used by critically ill patients.

Methods

Retrospective analysis of prospective collected data from 93 ICUs in Brazil from 2014 to 2015. We assessed frailty using the modified frailty index (MFI). The primary outcome was in-hospital mortality. Secondary outcomes were discharge home without need for nursing care, ICU and hospital length of stay (LOS), and utilization of ICU organ support and transfusion. We used mixed logistic regression and competing risk models accounting for relevant confounders in outcome analyses.

Results

The analysis consisted of 129,680 eligible patients. There were 40,779 (31.4%) non-frail (MFI?=?0), 64,407 (49.7%) pre-frail (MFI?=?1–2) and 24,494 (18.9%) frail (MFI?≥?3) patients. After adjusted analysis, frailty was associated with higher in-hospital mortality (OR 2.42, 95% CI 1.89–3.08), particularly in patients admitted with lower SOFA scores. Frail patients were less likely to be discharged home (OR 0.36, 95% CI 0.54–0.79) and had higher hospital and ICU LOS than non-frail patients. Use of all forms of organ support (mechanical ventilation, non-invasive ventilation, vasopressors, dialysis and transfusions) were more common in frail patients and increased as MFI increased.

Conclusions

Frailty, as assessed by MFI, was associated with several patient-centered endpoints including not only survival, but also ICU LOS and organ support.
  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