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   60209篇
  免费   3927篇
  国内免费   870篇
耳鼻咽喉   390篇
儿科学   1080篇
妇产科学   645篇
基础医学   2738篇
口腔科学   1137篇
临床医学   6911篇
内科学   6066篇
皮肤病学   783篇
神经病学   3041篇
特种医学   966篇
外科学   4060篇
综合类   12432篇
一般理论   4篇
预防医学   5849篇
眼科学   346篇
药学   10235篇
  161篇
中国医学   5230篇
肿瘤学   2932篇
  2024年   186篇
  2023年   1031篇
  2022年   2047篇
  2021年   2717篇
  2020年   2662篇
  2019年   2263篇
  2018年   2057篇
  2017年   2277篇
  2016年   2575篇
  2015年   2520篇
  2014年   6468篇
  2013年   6092篇
  2012年   5223篇
  2011年   4960篇
  2010年   3657篇
  2009年   2650篇
  2008年   2459篇
  2007年   2236篇
  2006年   1817篇
  2005年   1334篇
  2004年   1084篇
  2003年   874篇
  2002年   703篇
  2001年   585篇
  2000年   516篇
  1999年   391篇
  1998年   320篇
  1997年   278篇
  1996年   207篇
  1995年   183篇
  1994年   186篇
  1993年   134篇
  1992年   105篇
  1991年   93篇
  1990年   81篇
  1989年   94篇
  1988年   76篇
  1987年   72篇
  1986年   68篇
  1985年   164篇
  1984年   241篇
  1983年   201篇
  1982年   214篇
  1981年   185篇
  1980年   155篇
  1979年   153篇
  1978年   107篇
  1977年   68篇
  1976年   76篇
  1975年   68篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
可重复使用硬吸引瓶是一种新型、实用性强、安全性能好的引流瓶,全封闭性,在直视条件下观察引流液的量及颜色不需每日更换,只要内袋满了以后更换内袋。患者出院即可更换硬吸引瓶,使用后须按照医院制度进行清洗、消毒。含有大量致病菌及毒素的痰液、引流液全部收集在液体收集袋内,减少对环境的污染,创造了一个清洁卫生的工作环境,保护了医护人员的身心健康,有利于控制院内感染,符合控制医院感染的要求,也符合国家的环保产业政策。  相似文献   
992.
The definition of a "good" psychiatrist has varied over the past decades due to changing roles of psychiatrists. Studies on the qualities of "good" psychiatrists have been completed in many countries. However, no such study has been undertaken in Korea. In Korea, recent growing interest in psychiatry demands the identification of qualities for a good psychiatrist. The purpose of this study was to define the qualities of a good psychiatrist in Korea, subsequently facilitating the improvement of psychiatric training programs. The questionnaire was based on a Singaporean survey with the permission from the original authors. Respondents were divided into patient group and psychiatrist group. The 40-item questionnaire contained items grouped into four themes: Professional, Personal Values, Academic Executive and Relationship. Of the four themes, both patient and psychiatrist groups considered Professional as the most important, whereas Academic Executive as the least important. The mean scores for all items of each theme in the patient group were higher than those in the psychiatrist group, reflecting higher expectations for good psychiatrist in the patient group. Patients emphasized Relationship more than psychiatrists did. It is concluded that a good psychiatrist in Korea can be defined as "a good communicator and listener with a professional manner, who respects confidentiality and has good doctor-patient relationships."

Graphical Abstract

相似文献   
993.

Background

Frailty and acute kidney injury are independently associated with an increased risk of morbidity and mortality. The degree of frailty can be assessed by the Clinical Frailty Score (CFS). This study assessed whether an individual's CFS was associated with acute kidney injury in acute elderly medical admissions and recorded the short-term outcomes.

Methods

This was a single-center prospective observational cohort study. All patients aged ≥65 years admitted under an acute medical take over 12 nonconsecutive days were included. Patient demographics, comorbidities, baseline CFS, and renal status on admission were recorded. Outcomes of death, length of stay, and hospital re-attendance were assessed 2 weeks following admission.

Results

Of 164 patients (77 males), 19% had acute kidney injury on admission and 22% were considered severely frail. Severe frailty was associated with acute kidney injury (P = .01) and death within 2 weeks (P = .01). Two-week mortality was highest among patients with both (36%).

Conclusion

The incidence of acute kidney injury in “severely frail” acutely unwell elderly patients is significantly higher and associated with an increased short-term mortality. The CFS may be useful in acute illness to guide clinical decisions in elderly patients.  相似文献   
994.
995.
The possibility that isosorbide dinitrate (ISDN) inhibits platelet function in humans has been explored in vitro and in vivo. Incubation of citrated plateletrich plasma from healthy subjects with scalar concentrations (1.25, 12.5 and 125 μg/ml) of ISDN for 5 and 10 minutes resulted in a decrease in platelet aggregation after ADP, adrenaline, and arachidonic acid at the highest drug concentration (mean decrease: 72% [p < 0.01], 56% [p < 0.05] and 62% [p < 0.05], respectively, with the 10-minute incubation). Also, a significant reduction (30%) in generated thromboxane (TX)B2 levels was observed after arachidonic acid (p < 0.01). ISDN was then infused at rate of 4 mg/hour for 30 minutes in 11 patients with angina and at a rate of 30 mg/hour for 20 minutes in 8. The smaller dose, which caused minor changes in arterial pressure and heart rate, was accompanied by a marked, significant decrease in ADP- and adrenaline-induced aggregation, with a nadir at 60 minutes from the infusion stop (decreases of 40% and 51% respectively). Circulating platelet aggregates also decreased, with a minimum (? 41%, p < 0.05) at the end of the infusion. The higher infusion rate, causing marked hemodynamic effects, was not accompanied by the occurrence of clear antiplatelet effects. Thus, ISDN can affect platelet function both in vitro and in vivo. The in vivo effect occurs at lower concentrations than in vitro but is blunted when a marked hemodynamic response occurs.  相似文献   
996.
997.
998.
999.
1000.

Background

Lumbar-flexion-based endurance training, namely cycling, could be effective in reducing pain and improving function and health-related quality of life in older people with chronic low back pain.

Objectives

To assess barriers and facilitators to home-based cycling in older patients with lumbar spinal stenosis (LSS).

Methods

We conducted a retrospective mixed-method study. Patients  50 years old followed up for LSS from November 2015 to June 2016 in a French tertiary care center were screened. The intervention consisted of a single supervised session followed by home-based sessions of cycling, with dose (number of sessions and duration, distance and power per session) self-determined by patient preference. The primary outcome was assessed by a qualitative approach using semi-structured interviews at baseline and 3 months and was the identification of barriers and facilitators to the intervention. Secondary outcomes were assessed by a quantitative approach and were adherence monitored by a USB stick connected to the bicycle, burden of treatment assessed by the Exercise Therapy Burden Questionnaire (ETBQ) and clinical efficacy assessed by change in lumbar pain, radicular pain, disability, spine-specific activity limitation and maximum walking distance at 3 months.

Results

Overall, 15 patients were included and data for 12 were analyzed at 3 months. At baseline, the mean age was 70.9 years (95% CI: 64.9–76.8) and 9/15 patients (60.0%) were women. Barriers to cycling were fear of pain and fatigue, a too large bicycle, burden of hospital follow-up and lack of time and motivation. Facilitators were clinical improvement, surveillance and ease-of-use of the bicycle. Adherence remained stable overtime. The burden of treatment was low [mean ETBQ score: 21.0 (95% confidence interval: 11.5–30.5)]. At 3 months, 7/12 patients (58.3%) self-reported clinical improvement, with reduced radicular pain and disability [mean absolute differences: ?27.5 (?43.3 to ?11.7), P < 0.01 and ?17.5 (?32.1 to ?2.9), P = 0.01, respectively].

Conclusions

For people with LSS, home-based cycling is a feasible intervention.  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