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   3833篇
  免费   278篇
  国内免费   23篇
耳鼻咽喉   57篇
儿科学   191篇
妇产科学   120篇
基础医学   382篇
口腔科学   133篇
临床医学   440篇
内科学   815篇
皮肤病学   142篇
神经病学   347篇
特种医学   102篇
外科学   667篇
综合类   51篇
预防医学   164篇
眼科学   164篇
药学   244篇
中国医学   10篇
肿瘤学   105篇
  2023年   57篇
  2022年   96篇
  2021年   143篇
  2020年   86篇
  2019年   90篇
  2018年   140篇
  2017年   113篇
  2016年   160篇
  2015年   178篇
  2014年   207篇
  2013年   316篇
  2012年   216篇
  2011年   223篇
  2010年   243篇
  2009年   155篇
  2008年   189篇
  2007年   201篇
  2006年   192篇
  2005年   157篇
  2004年   133篇
  2003年   104篇
  2002年   81篇
  2001年   63篇
  2000年   34篇
  1999年   58篇
  1998年   35篇
  1997年   35篇
  1996年   23篇
  1994年   19篇
  1993年   9篇
  1992年   19篇
  1991年   16篇
  1990年   14篇
  1989年   19篇
  1988年   22篇
  1987年   20篇
  1986年   16篇
  1985年   11篇
  1983年   8篇
  1982年   8篇
  1981年   8篇
  1972年   9篇
  1971年   6篇
  1965年   7篇
  1931年   12篇
  1930年   12篇
  1928年   8篇
  1927年   7篇
  1926年   8篇
  1924年   9篇
排序方式: 共有4134条查询结果,搜索用时 15 毫秒
101.
102.
103.
Clinical Rheumatology - The aim of this study was to evaluate the associations between malnutrition and the clinical features of the disease and depression in patients with systemic sclerosis...  相似文献   
104.

Background

Infections are an important acquired cause of cerebral arteriopathy. Tuberculous (TB) meningitis leading to infectious cerebral vasculopathy is a rare cause of acute hemiparesis.

Case report

A 14-year-old male patient was examined after acute hemiparesis developing within 1 day. Neurological examination revealed total hemiplegia on the left side. Brain MRI findings showed bilateral focal T2-weighted signal hyperintensity in the subcortical and deep white matter regions. There were also areas of restricted diffusion in the right basal ganglia. Although the father had a history of pulmonary TB, the patient had not been given TB prophylaxis because of PPD negativity. At lumbar puncture, opening cerebrospinal fluid (CSF) pressure was 50 cm/H20, CSF protein 66.9 mg/dL, and glucose 54 mg/dL (concurrent blood glucose 93 mg/dL); 170 polymorphonuclear leukocytes per cubic millimeter were present in CSF. Following tests for TB, treatment was started immediately with four anti-TB drugs. TB PCR of CSF and acid-fast bacteria (AFB) staining in gastric aspirate were positive. At clinical follow-up, the patient was able to walk with support at the end of the first month.

Conclusion

Various infectious agents have been reported as causes of cerebral vasculopathy. TB, which affects a significant number of patients worldwide, should be kept in mind in terms of cerebral vascular complications. Lumbar puncture is essential in order to diagnose TB meningitis.  相似文献   
105.
106.
The Deutsche Arbeitsgemeinschaft für Jugendzahnpflege (DAJ, German Working Group for Youth Dental Care) study from 2009 evaluated a differentiated picture of dental health in children and adolescents. Whereas most adolescents are today free of caries due to the continual caries decline, 46.1 % of school beginners have already experienced caries of the primary dentition. Simultaneously, caries shows an increasing trend towards polarization. In most cases affected children are presented to a dentist relatively late, so that caries in deciduous teeth is often already present with pulpitis. To avoid premature loss of milk teeth with consequential damage, an endodontic therapy must often be carried out. A systematic literature search was carried out to evaluate the clinical success of different endodontic measures for milk teeth. Only controlled or randomized controlled studies with a minimum observational period of 6 months were included. It can be concluded that very high success rates can be achieved by adhering to an appropriate standard operating procedure for endodontic measures.  相似文献   
107.
Background:Sarcoidosis, a multisystemic disease of unknown etiology, is characterized by non-caseating granulomatous inflammation. This study aimed to investigate the efficiency of atherogenic indices and ultrasonographic evaluation of carotid artery on predicting atherosclerosis in patients with sarcoidosis.Methods:The study included 44 subjects followed with diagnosis of sarcoidosis and 53 age and gender matched healthy subjects as controls. Laboratory findings, pulmonary function tests and carotid artery ultrasonography of all participants were evaluated.Results:Of the participants with sarcoidosis 70.5% was female and the mean age was 35.36±7.18 years, while 64.2% of the control group were female and the mean age was 33.58±8.13 years (P=0.511 and P=0.191, respectively). High-density-lipoprotein cholesterol level in the sarcoidosis group was significantly lower than that of the control group (P=0.017), while other cholesterol levels were higher than those of the controls (P<0.05). Intima-media thickness (IMT) and peak systolic velocity (PSV) of carotid artery were higher in patients with sarcoidosis (P<0.001 and P=0.009, respectively). Atherogenic indices (Atherogenic Index (AI), Atherogenic Coefficient (AC) and Cardiogenic Risk Ratio (CRR)) were higher in sarcoidosis group compared to the controls (P<0.001, for all parameters). IMT was positively correlated with PSV, AI, AC, and CRR. A positive correlation between PSV and atherogenic indices was also detected.Conclusions:Sarcoidosis may be a predisposing factor for atherosclerosis. Atherogenic indices, IMT of carotid artery and PSV might be considered predictors for atherosclerosis and cardiovascular diseases in asymptomatic sarcoidosis patients.  相似文献   
108.
BackgroundEfficacy of elvitegravir/cobicistat/emtricitabine/tenofovir disoproxil (E/C/F/TDF) in treatment-naïve and experienced patients with HIV infection was demonstrated in phase 3 trials. The primary objective of this study was to evaluate effectiveness and safety of E/C/F/TDF in real world settings.MethodsRetrospective, observational data collected by the Turkish ACTHIV-IST study group between May 2015 and December 2016 were analysed.ResultsA total of 387 patients were prescribed E/C/F/TDF; 210 patients with available data at 6th month were eligible; 91.5% were male, and mean age was 35.2 (SD: 10.8) years; 54.0% of males identified themselves as MSM. Sixty-three percent (133) of the study population were treatment-naïve patients, and 37% (77) were treatment experienced. HIV RNA level was below 100 copies/mL in 78.9% of treatment-naïve patients and 89.9% of treatment experienced patients at month 6. Median increase in CD4 T lymphocyte count was 218 copies/mL in treatment-naïve patients and remained stable or increased in treatment experienced patients. Adverse events were observed in 15% of the patients, and the regimen was discontinued in only six patients.ConclusionReal world data on the effectiveness and safety of E/C/F/TDF is comparable with the phase 3 trial results Adverse events are uncommon and manageable.  相似文献   
109.
110.
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