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   2381篇
  免费   166篇
  国内免费   56篇
耳鼻咽喉   11篇
儿科学   24篇
妇产科学   26篇
基础医学   267篇
口腔科学   80篇
临床医学   125篇
内科学   946篇
皮肤病学   42篇
神经病学   75篇
特种医学   52篇
外科学   177篇
综合类   171篇
预防医学   75篇
眼科学   17篇
药学   322篇
中国医学   71篇
肿瘤学   122篇
  2023年   22篇
  2022年   30篇
  2021年   44篇
  2020年   89篇
  2019年   131篇
  2018年   121篇
  2017年   94篇
  2016年   91篇
  2015年   85篇
  2014年   201篇
  2013年   148篇
  2012年   110篇
  2011年   115篇
  2010年   70篇
  2009年   146篇
  2008年   146篇
  2007年   188篇
  2006年   71篇
  2005年   97篇
  2004年   64篇
  2003年   49篇
  2002年   39篇
  2001年   42篇
  2000年   35篇
  1999年   69篇
  1998年   30篇
  1997年   25篇
  1996年   18篇
  1995年   30篇
  1994年   16篇
  1993年   13篇
  1992年   7篇
  1990年   4篇
  1988年   7篇
  1987年   9篇
  1986年   5篇
  1985年   11篇
  1984年   20篇
  1983年   6篇
  1982年   14篇
  1981年   11篇
  1980年   9篇
  1979年   5篇
  1978年   11篇
  1977年   7篇
  1976年   14篇
  1975年   11篇
  1974年   9篇
  1973年   5篇
  1972年   4篇
排序方式: 共有2603条查询结果,搜索用时 15 毫秒
1.
2.
3.
Objectives: To evaluate the safety of acute ischemic stroke (AIS) therapy in patients with infective endocarditis (IE) with intravenous thrombolysis (IVT) or endovascular therapy (EVT) such as mechanical thrombectomy. Methods: We conducted a retrospective study of patients who underwent AIS therapy with IVT or EVT at a tertiary referral center from 2013 to 2017, that were later diagnosed with acute IE as the causative mechanism. We then performed a systematic review of reports of acute ischemic reperfusion therapy in IE since 1995 for their success rates in terms of neurological outcome, and mortality, and their risk of hemorrhagic complication. Results: In the retrospective portion, 8 participants met criteria, of whom 4 received IVT and 4 received EVT. Through systematic review, 24 publications of 32 participants met criteria. Combined, a total of 40 participants were analyzed: 18 received IVT alone, 1 received combined IVT plus EVT, and 21 received EVT alone. IVT compared to EVT were similar in rates of good neurologic outcomes (58% versus 76%, P= .22) and mortality (21% versus 19%, P= .87), but had higher post-therapy intracranial hemorrhage (63% versus 18% [P= .006]). Conclusion: IV thrombolysis has a higher rate of post-therapy intracranial hemorrhage compared to EVT. EVT should be considered as first-line AIS therapy for patients with known, or suspected, IE who present with a large vessel occlusion.  相似文献   
4.
The increase in the pharyngeal airway space after mandibular advancement has not been well explained, and in this study we aimed to show whether there is a correlation in the increase of pharyngeal airway space as a consequence of the mandibular advancement or of the relative change between the mandibular position and the natural head position (NHP). Fifteen patients who had bilateral sagittal split osteotomy for mandibular advancement with or without genioplasty were studied retrospectively. The primary variables of mandibular position, NHP, and pharyngeal airway space were measured in three dimensions using preoperative and postoperative cone-beam computed tomographic datasets and were compared using the paired t test. The secondary variable of pharyngeal airway space was defined as the square root of the mean cross-sectional area (CSA1/2) of the pharyngeal airway space. Pearson’s correlation coefficient was used to find out whether there was a correlation between the change in CSA1/2 and the change in mandibular position, or the relative change between the mandibular position and the NHP. Volumes and minimal cross-sectional areas were increased in the pharyngeal airway space, and lengths of airways decreased. Correlation existed only between the increase in CSA1/2 and the relative change between the mandibular position and NHP. The increase in pharyngeal airway space after mandibular advancement correlated with the relative changes between the mandibular position and the NHP.  相似文献   
5.
6.
7.
8.
BackgroundAs an ongoing worldwide health issue, Coronavirus disease 2019 (COVID–19) has been causing serious complications, including pneumonia, acute respiratory distress syndrome (ARDS), and multi-organ failure. However, there is no decisive treatment approach available for this disorder, which is primarily attributed to the large amount of inflammatory cytokine production. We aimed to identify the effects of Nano-curcumin on the modulation of inflammatory cytokines in COVID-19 patients.MethodForty COVID-19 patients and 40 healthy controls were recruited and evaluated for inflammatory cytokine expression and secretion. Subsequently, COVID-19 patients were divided into two groups: 20 patients receiving Nano-curcumin and 20 patients as the placebo group. The mRNA expression and cytokine secretion levels of IL-1β, IL-6, TNF-α and IL‐18 were assessed by Real‐time PCR and ELISA, respectively.ResultOur primary results indicated that the mRNA expression and cytokine secretion of IL-1β, IL-6, TNF-α, and IL-18 were increased significantly in COVID-19 patients compared with healthy control group. After treatment with Nano-curcumin, a significant decrease in IL-6 expression and secretion in serum and in supernatant (P = 0.0003, 0.0038, and 0.0001, respectively) and IL-1β gene expression and secretion level in serum and supernatant (P = 0.0017, 0.0082, and 0.0041, respectively) was observed. However, IL-18 mRNA expression and TNF-α concentration were not influenced by Nano-curcumin.ConclusionNano-curcumin, as an anti-inflammatory herbal based agent, may be able to modulate the increased rate of inflammatory cytokines especially IL-1β and IL-6 mRNA expression and cytokine secretion in COVID-19 patients, which may cause an improvement in clinical manifestation and overall recovery.  相似文献   
9.
10.
Gestational diabetes mellitus (GDM) is a global health concern, not only because its prevalence is high and on the increase, but also because of the potential implications for the health of mothers and their offspring. Unfortunately, there is considerable controversy in the literature surrounding the diagnosis and treatment of GDM, as well as the possible long‐term consequences for the offspring. As a result, worldwide there is a lack of uniformly accepted diagnostic criteria and the advice regarding the treatment of GDM, including diet, insulin therapy, and the use of oral blood glucose‐lowering agents, is highly variable. In this review we provide an overview of the important issues in the field of GDM, including diagnostic criteria, different treatment regimens available, and the long‐term consequences of GDM in the offspring.  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