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   20350篇
  免费   1225篇
  国内免费   203篇
耳鼻咽喉   166篇
儿科学   335篇
妇产科学   330篇
基础医学   2887篇
口腔科学   676篇
临床医学   1865篇
内科学   5345篇
皮肤病学   233篇
神经病学   2093篇
特种医学   707篇
外科学   2992篇
综合类   63篇
一般理论   3篇
预防医学   1014篇
眼科学   258篇
药学   1607篇
中国医学   69篇
肿瘤学   1135篇
  2024年   49篇
  2023年   141篇
  2022年   343篇
  2021年   580篇
  2020年   416篇
  2019年   508篇
  2018年   625篇
  2017年   456篇
  2016年   520篇
  2015年   598篇
  2014年   791篇
  2013年   966篇
  2012年   1536篇
  2011年   1582篇
  2010年   873篇
  2009年   786篇
  2008年   1227篇
  2007年   1325篇
  2006年   1147篇
  2005年   1216篇
  2004年   1112篇
  2003年   988篇
  2002年   949篇
  2001年   227篇
  2000年   231篇
  1999年   234篇
  1998年   223篇
  1997年   154篇
  1996年   113篇
  1995年   115篇
  1994年   107篇
  1993年   100篇
  1992年   144篇
  1991年   97篇
  1990年   88篇
  1989年   66篇
  1988年   69篇
  1987年   62篇
  1986年   66篇
  1985年   55篇
  1984年   53篇
  1983年   40篇
  1982年   37篇
  1981年   35篇
  1980年   34篇
  1973年   24篇
  1970年   24篇
  1935年   21篇
  1925年   23篇
  1922年   22篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.

Objectives

To analyze the factors associated with fatigue focusing on comorbidities in a large cohort of rheumatoid arthritis (RA).

Methods

Cross-sectional analyses were performed on RA patients from the French COMEDRA cohort study, a nurse-led program for comorbidities management. Fatigue was assessed using Question 3 of the Rheumatoid Arthritis Impact of Disease (RAID) score on a 0–10 numerical rating scale (NRS). Fatigue was defined as acceptable if?≤?2, moderate if 3 or 4, or severe if?≥?5 out of 10. Using univariate and multivariate models, the relationship between fatigue and demographics, social, disease characteristics, comorbidities (cardiovascular, infections, cancer, pulmonary, osteoporosis, and psychiatric disorders), physical activity, quality of life, and treatments was investigated.

Results

In total, 962 patients were analyzed. The mean fatigue score was 3.8?±?2.7, 40% of patients reported severe fatigue. Patients had an average of 1.8 additional morbid conditions, with anxiety/depression the most common (52%). In univariate analysis, severe fatigue was more frequent in women, in patients not working, and in those with less physical activity. It was associated with disease duration and activity, mHAQ, pain, sleeping and emotional difficulties. Severe fatigue correlated with Multimorbidity index assessing the number of morbid conditions and was associated with obesity, hypertension, COPD, and anxiety/depression. In multivariate models, the risk of severe fatigue was associated with female gender, disease activity, mHAQ, current treatment with NSAIDs and biologics, multimorbidity, obesity and anxiety/depression.

Conclusions

Assessment of comorbidities, psychological health and physical activity should be taken into account in order to address frequent RA-related severe fatigue.  相似文献   
2.
3.
4.
5.
6.
7.
8.
9.
10.
Objective: Parkinson's disease (PD) is characterized by deterioration of the nigrostriatal system and associated with chronic neuroinflammation. Glial activation has been associated with regulating the survival of dopaminergic neurons and is thought to contribute to PD through the release of proinflammatory and neurotoxic factors, such as reactive nitric oxide (NO) that triggers or exacerbates neurodegeneration in PD. Polyunsaturated fatty acids (PUFAs) exert protective effects, including antiinflammatory, antiapoptotic, and antioxidant activity, and may be promising for delaying or preventing PD by attenuating neuroinflammation and preserving dopaminergic neurons. The present study investigated the effects of fish oil supplementation that was rich in PUFAs on dopaminergic neuron loss, the density of inducible nitric oxide synthase (iNOS)-immunoreactive cells, and microglia and astrocyte reactivity in the substantia nigra pars compacta (SNpc) and striatal dopaminergic fibers.

Methods: The animals were supplemented with fish oil for 50 days and subjected to unilateral intrastriatal 6-hydroxydopamine (6-OHDA)-induced lesions as a model of PD.

Results: Fish oil mitigated the loss of SNpc neurons and nerve terminals in the striatum that was caused by 6-OHDA. This protective effect was associated with reductions of the density of iNOS-immunoreactive cells and microglia and astrocyte reactivity.

Discussion: These results suggest that the antioxidant and antiinflammatory properties of fish oil supplementation are closely related to a decrease in dopaminergic damage that is caused by the 6-OHDA model of PD.  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