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:      
  示例: 沙坡头地区,人工植被区,变化  检索词用空格隔开表示必须包含全部检索词,用“,”隔开表示只需满足任一检索词即可!
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   2949篇
  免费   98篇
  国内免费   13篇
耳鼻咽喉   20篇
儿科学   124篇
妇产科学   100篇
基础医学   411篇
口腔科学   57篇
临床医学   222篇
内科学   538篇
皮肤病学   120篇
神经病学   260篇
特种医学   63篇
外科学   258篇
综合类   55篇
一般理论   1篇
预防医学   215篇
眼科学   147篇
药学   209篇
中国医学   17篇
肿瘤学   243篇
  2024年   25篇
  2023年   35篇
  2022年   64篇
  2021年   110篇
  2020年   56篇
  2019年   81篇
  2018年   98篇
  2017年   65篇
  2016年   91篇
  2015年   100篇
  2014年   116篇
  2013年   162篇
  2012年   237篇
  2011年   234篇
  2010年   146篇
  2009年   106篇
  2008年   157篇
  2007年   142篇
  2006年   139篇
  2005年   131篇
  2004年   116篇
  2003年   106篇
  2002年   98篇
  2001年   39篇
  2000年   41篇
  1999年   22篇
  1998年   21篇
  1997年   24篇
  1996年   22篇
  1995年   15篇
  1994年   10篇
  1993年   14篇
  1992年   25篇
  1991年   17篇
  1990年   19篇
  1989年   17篇
  1988年   15篇
  1987年   15篇
  1986年   20篇
  1985年   21篇
  1984年   9篇
  1983年   17篇
  1982年   8篇
  1981年   7篇
  1980年   10篇
  1979年   6篇
  1978年   7篇
  1976年   4篇
  1974年   4篇
  1972年   3篇
排序方式: 共有3060条查询结果,搜索用时 0 毫秒
91.
The UN High-Level Meeting on Non-Communicable Diseases (NCDs) in September, 2011, is an unprecedented opportunity to create a sustained global movement against premature death and preventable morbidity and disability from NCDs, mainly heart disease, stroke, cancer, diabetes, and chronic respiratory disease. The increasing global crisis in NCDs is a barrier to development goals including poverty reduction, health equity, economic stability, and human security. The Lancet NCD Action Group and the NCD Alliance propose five overarching priority actions for the response to the crisis--leadership, prevention, treatment, international cooperation, and monitoring and accountability--and the delivery of five priority interventions--tobacco control, salt reduction, improved diets and physical activity, reduction in hazardous alcohol intake, and essential drugs and technologies. The priority interventions were chosen for their health effects, cost-effectiveness, low costs of implementation, and political and financial feasibility. The most urgent and immediate priority is tobacco control. We propose as a goal for 2040, a world essentially free from tobacco where less than 5% of people use tobacco. Implementation of the priority interventions, at an estimated global commitment of about US$9 billion per year, will bring enormous benefits to social and economic development and to the health sector. If widely adopted, these interventions will achieve the global goal of reducing NCD death rates by 2% per year, averting tens of millions of premature deaths in this decade.  相似文献   
92.
93.
Asthma is probably the most common serious medical disorder that may complicate pregnancy. A third of pregnant women with asthma will experience worsening of their symptoms, a third will see improvement of their symptoms and a third will see no change. The primary goal is to maintain optimal control of asthma for maternal health and well-being as well as fetal maturation. Vital patient education should cover the use of controller medication, avoidance of asthma triggers and early treatment of asthma exacerbations. Proper asthma management should ideally be started in the preconception period. Since smoking is probably the most modifiable risk factor of asthma, pregnant woman should avoid active and passive smoking. Acute asthma exacerbation during the first trimester is associated with an increased risk of congenital malformations. Poorly controlled asthma is associated with low birth weight, preeclampsia, and preterm birth. Medications used for asthma control in the non-pregnant population are generally the same in pregnancy with a few exceptions. Inhaled corticosteroids (ICS) are the preferred controller therapy. Budesonide is the preferred ICS. Long-acting B-agonists (LABA) are the preferred add-on therapy to medium to high dose ICS. Major triggers for asthma exacerbations during pregnancy are viral infections and ICS nonadherence.  相似文献   
94.
Human locomotor adaptation is necessary to maintain flexibility of walking. Several lines of research suggest that the cerebellum plays a critical role in motor adaptation. In this study we investigated the effects of noninvasive stimulation of the cerebellum to enhance locomotor adaptation. We found that anodal cerebellar transcranial direct current stimulation (tDCS) applied during adaptation expedited the adaptive process while cathodal cerebellar tDCS slowed it down, without affecting the rate of de-adaptation of the new locomotor pattern. Interestingly, cerebellar tDCS affected the adaptation rate of spatial but not temporal elements of walking. It may be that spatial and temporal control mechanisms are accessible through different neural circuits. Our results suggest that tDCS could be used as a tool to modulate locomotor training in neurological patients with gait impairments.  相似文献   
95.
96.
97.

Background

Post-partum hemorrhage (PPH) is the most common direct cause of maternal mortality and timely intervention can save many lives.

Objective

To compare the effectiveness of sublingual misoprostol to intravenous oxytocin in preventing post-partum hemorrhage in low risk vaginal birth.

Methods

One hundred patients with no risk factor for PPH were randomly allocated to receive 600 μg misoprostol administered sublingually or 10 IU of intravenous oxytocin immediately after the delivery of baby. Main outcome measures were post-partum blood loss, drop in hemoglobin in 24 h, duration of third stage of labor, and drug-related adverse effects.

Results

Mean age, parity and gestational age were similar in both groups. Mean blood loss was significantly lower in oxytocin group (114.28 ± 26.75 versus 149.50 ± 30.78 ml; p = 0.00). Drop in hemoglobin was 0.31 ± 0.16 versus 0.49 ± 0.21 g% (p = 0.01) in oxytocin and misoprostol group, respectively. Duration of third stage labor was shorter in oxytocin group (median 5 min, IQR: 4.5–5.5 versus 5.5 min, IQR: 5–6 min, p < 0.01). Although fever and shivering were common adverse effects with misoprostol but were not clinically significant.

Conclusion

Intravenous oxytocin is more efficacious than sublingual misoprostol in preventing PPH in institutional deliveries.  相似文献   
98.
99.
100.
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