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   1707篇
  免费   137篇
  国内免费   17篇
耳鼻咽喉   9篇
儿科学   61篇
妇产科学   66篇
基础医学   203篇
口腔科学   84篇
临床医学   141篇
内科学   359篇
皮肤病学   106篇
神经病学   110篇
特种医学   71篇
外国民族医学   4篇
外科学   155篇
综合类   47篇
预防医学   73篇
眼科学   39篇
药学   217篇
中国医学   8篇
肿瘤学   108篇
  2024年   2篇
  2023年   42篇
  2022年   77篇
  2021年   133篇
  2020年   91篇
  2019年   109篇
  2018年   123篇
  2017年   89篇
  2016年   91篇
  2015年   87篇
  2014年   80篇
  2013年   116篇
  2012年   136篇
  2011年   119篇
  2010年   74篇
  2009年   55篇
  2008年   63篇
  2007年   61篇
  2006年   54篇
  2005年   52篇
  2004年   32篇
  2003年   20篇
  2002年   20篇
  2001年   10篇
  2000年   8篇
  1999年   12篇
  1998年   5篇
  1997年   8篇
  1996年   3篇
  1995年   4篇
  1993年   1篇
  1992年   7篇
  1991年   10篇
  1990年   9篇
  1989年   4篇
  1988年   9篇
  1987年   9篇
  1986年   8篇
  1985年   6篇
  1984年   2篇
  1983年   7篇
  1982年   2篇
  1980年   1篇
  1979年   1篇
  1978年   1篇
  1977年   1篇
  1976年   3篇
  1972年   1篇
  1971年   1篇
  1967年   1篇
排序方式: 共有1861条查询结果,搜索用时 78 毫秒
91.
Clinical Rheumatology - Diabetic neuropathy (DN) is a common and serious complication of diabetes. DN patients are suffering from anxiety, depression, and impairment of functional capacity. Rare...  相似文献   
92.
Journal of Thrombosis and Thrombolysis - There is no strong evidence on pharmacogenetics role on the quality of INR control after the initiation phase and on the maintenance of stable INR on the...  相似文献   
93.

Purpose:

This research was done to assess levels of psychosocial stress and related hazards [(burnout, depression, and posttraumatic stress disorder (PTSD)] among emergency medical responders (EMRs).

Materials and Methods:

A comparative cross-sectional study was conducted upon (140) EMRs and a comparative group composed of (140) nonemergency workers. The groups studied were subjected to semistructured questionnaire including demographic data, survey for job stressors, Maslach burn out inventory (MBI), Beck depression inventory (BDI), and Davidson Trauma scale for PTSD.

Results:

The most severe acute stressors among EMRs were dealing with traumatic events (88.57%), followed by dealing with serious accidents (87.8%) and young victims (87.14%). Chronic stressors were more commonly reported among EMRs with statistically significant differences (P < 0.05) except for social support with colleagues and supervisors. EMRs had statistically significant higher levels of emotional exhaustion (EE) (20%) and depersonalization (DP) (9.3%) compared with comparative group (4.3%, 1.4% respectively). Also, there was no statistically significant difference between two groups as regards lower personal achievement or depression symptoms (P > 0.05). There was increased risk of PTSD for those who had higher stress levels from death of colleagues [odds ratio (OR) [95% confidence interval (CI)] = 2.2 (0.7-7.6), exposure to verbal or physical assault OR (95% CI) = 1.6 (0.5-4.4) and dealing with psychiatric OR (95% CI) 1.4 (0.53.7) (P > 0.05)

Conclusion:

EMRs group had more frequent exposure to both acute and chronic work-related stressors than comparative group. Also, EMRs had higher levels of EE, DP, and PTSD compared with comparative group. EMRs are in need for stress management program for prevention these of stress related hazards on health and work performance.  相似文献   
94.
95.
96.
97.
ObjectivesTo assess serum 25-hydroxycholecalciferol (25-OH vitamin D) levels in Jordanian children with bronchial asthma, and to examine correlations between 25-OH vitamin D levels and asthma severity and control.MethodsA cross-sectional study was conducted at the Paediatric Chest Clinic, Al-Karak Governmental Hospital, Southern Jordan, between May 2015 and February 2016. Serum 25-hydroxyvitamin D level was determined in children aged 1–14 years diagnosed with bronchial asthma (6–14 years) or recurrent wheezing episodes (<6 years). Asthma severity was determined based on the Global Initiative for Asthma assessment, the Asthma Control Test, and the Childhood Asthma Control Test. Demographic and clinical characteristics were compared between patients with low and normal 25-OH vitamin D levels, and correlations between asthma severity and 25-OH vitamin D level were assessed.ResultsOut of 98 included children, 25-OH vitamin D levels were deficient and insufficient in 41 (41.8%) and 34 (34.7%) children, respectively. Only 23 (23.5%) had sufficient 25-OH vitamin D levels. A significant correlation was found between severity of asthma symptoms and 25-OH vitamin D deficiency.Conclusion25-OH vitamin D deficiency is highly prevalent in Jordanian children with bronchial asthma and correlates significantly with asthma severity.  相似文献   
98.
99.

Objective

To study the role of VDR polymorphisms as risk factor for RA and osteoporosis, and whether osteoporosis complicating RA is due to RA or VDR polymorphisms.

Methods

VDR gene polymorphisms ApaI, TaqI, BsmI and FokI were typed by RFLP for 128 RA patients, 30 postmenopausal osteoporotic females and 150 healthy controls.

Results

Significant differences were found between patients and healthy controls in the frequency of BsmI and TaqI (Pc < 0.05) but no significant associations were found for FokI and ApaI polymorphisms except for aa genotype (Pc < 0.001). Titers of RF were higher with aa and bb genotypes. Anti-CCP and CRP levels were higher with aa genotype and more bone loss was associated with Bb genotype. Ff genotype frequency was higher in RA patients with osteoporosis than those without osteoporosis.

Conclusions

The ApaI, BsmI and TaqI polymorphisms may be a susceptibility risk factors for RA and the Ff genotype may be responsible for development of osteoporosis in RA Egyptian patients. However, the present study needs to be replicated in a large number of patients from allover the Egypt and also in multi-ethnic populations.  相似文献   
100.
The effect of misoprostol, a synthetic prostaglandin E1 analog, on the development of oxidative stress induced in mice with lipopolysaccharide (LPS) endotoxin was investigated. Misoprostol was administered by intraperitoneal route (i.p.) at doses of 10, 100, or 1,000 μg/kg at the time of LPS injection (200 μg/kg, i.p.). Mice were euthanized 4 h later. Lipid peroxidation (malondialdehyde; MDA), reduced glutathione (GSH), nitric oxide (nitrite/nitrate) levels as well as paraoxonase activity were measured in brain and liver. Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities as well as DNA fragmentation were determined in the liver. The administration of LPS increased oxidative stress both in the brain and liver tissue. There were significantly increased MDA and nitrite and decreased GSH and PON1 activity in the brain and liver, respectively. In addition, LPS was associated with markedly elevated plasma ALT and AST level as well as increased liver DNA fragmentation. The administration of misoprostol at 100 or 1,000 μg/kg decreased brain MDA by 17.6 and 30 %, increased GSH by 29.8 and 33.3 %, and decreased nitric oxide by 21.74 and 42.5 %, respectively, compared with the lipopolysaccharide control group. Liver MDA decreased by 27 %, GSH increased by 47.7 %, and nitric oxide decreased by 37.2 % with misoprostol at 1,000 μg/kg. Paraoxonase activity increased in both the brain and liver by misoprostol administration. The increase in liver AST and ALT and DNA fragmentation after endotoxin administration was normalized by misoprostol. These results indicate that misoprostol can alleviate oxidative stress in the presence of a mild systemic inflammatory illness, indicating a new and potentially important therapeutic application for the drug.  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