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   2388篇
  免费   137篇
  国内免费   12篇
耳鼻咽喉   15篇
儿科学   172篇
妇产科学   63篇
基础医学   274篇
口腔科学   137篇
临床医学   140篇
内科学   587篇
皮肤病学   32篇
神经病学   96篇
特种医学   138篇
外科学   199篇
综合类   75篇
预防医学   205篇
眼科学   141篇
药学   125篇
中国医学   7篇
肿瘤学   131篇
  2023年   16篇
  2022年   40篇
  2021年   87篇
  2020年   60篇
  2019年   49篇
  2018年   70篇
  2017年   53篇
  2016年   64篇
  2015年   74篇
  2014年   81篇
  2013年   105篇
  2012年   172篇
  2011年   132篇
  2010年   91篇
  2009年   83篇
  2008年   124篇
  2007年   128篇
  2006年   84篇
  2005年   84篇
  2004年   80篇
  2003年   75篇
  2002年   75篇
  2001年   52篇
  2000年   39篇
  1999年   44篇
  1998年   22篇
  1997年   12篇
  1992年   18篇
  1991年   21篇
  1990年   22篇
  1989年   29篇
  1988年   40篇
  1987年   38篇
  1986年   35篇
  1985年   41篇
  1984年   23篇
  1983年   15篇
  1980年   9篇
  1979年   24篇
  1978年   11篇
  1977年   11篇
  1976年   15篇
  1975年   12篇
  1974年   21篇
  1973年   9篇
  1971年   20篇
  1970年   21篇
  1969年   14篇
  1968年   15篇
  1967年   9篇
排序方式: 共有2537条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
95.
96.
BackgroundDiabetic Retinopathy (DR) is an important microvascular complication of diabetes that can lead to irreversible blindness. Microalbuminuria is strongly associated with diabetic retinopathy and can be used as a reliable marker of diabetic retinopathy.AimTo assess the association between DR, microalbuminuria, and other modifiable risk factors in patients with type 2 diabetes.Methodology3090 patients with T2DM visiting North Delhi Diabetes Centre, New Delhi between July 2016 to October 2019 were evaluated for the clinical and biochemical parameters that included urinary albumin, HbA1C, lipid profiles, serum creatinine estimation and underwent biothesiometry.Results3090 patients (1350 females and 1740 males), with mean age of 52.7 ± 9.2 years and diabetes duration ranging from 1 to 19 years (mean 9.4 ± 6), duration of less than 5 years, 6–10 years and more than 10 years in 52%, 26% and in 22%, respectively. Duration of diabetes was strong predictor of retinopathy (p = 0.001). The HbA1c and BMI in patients with DR was significantly higher than in those without DR. 18.2% patients were diagnosed to have retinopathy. Peripheral neuropathy was observed in 24.2% and was positively associated with DR (p = 0.002). 33.9% and 4.5% patients had microalbuminuria macroalbuminuria, respectively and 9.7% patients had creatinine >1.3 mg/dL. There was significant positive relationship between different grades of retinopathy and albuminuria.ConclusionsOur study is a large real-world study that demonstrates that HbA1c, BMI, duration of diabetes, microalbuminuria and peripheral neuropathy are relatively, yet cohesively contributing factors towards varying grade of retinopathy.  相似文献   
97.
98.
Polymyositis associated with ulcerative colitis.   总被引:2,自引:0,他引:2       下载免费PDF全文
S Chugh  J B Dilawari  I M Sawhney  N Dang  B D Radotra    Y K Chawla 《Gut》1993,34(4):567-569
An elderly woman with chronic ulcerative colitis who developed proximal muscle weakness, increased serum creatine phosphokinase activity, and histological and electromyographic abnormalities characteristic of polymyositis is described. Treatment with corticosteroids and 5-acetylsalicylic acid was followed by a remission in bowel symptoms, improvement in muscle power, and reversal of electromyographic changes. An autoimmune link between the two disorders seems likely.  相似文献   
99.
The Asian Pacific Association for the Study of the Liver (APASL) Working Party on Portal Hypertension has developed consensus guidelines on the disease profile, diagnosis, and management of noncirrhotic portal fibrosis and idiopathic portal hypertension. The consensus statements, prepared and deliberated at length by the experts in this field, were presented at the annual meeting of the APASL at Kyoto in March 2007. This article includes the statements approved by the APASL along with brief backgrounds of various aspects of the disease.  相似文献   
100.

Setting

Department of Microbiology.

Objective

To determine the common mutations responsible for rifampicin resistance in TB cases detected by Xpert MTB/RIF assay.

Design

Results of Xpert MTB/RIF assay performed from 2013 to 2017 were analysed for missing probes in different types of specimens containing rifampicin resistant MTB.

Results

Successful results were obtained in14872 of the total 15129 specimens processed by Xpert MTB/RIF assay, of which 9458 (63.6%) were sputum and 5414 (36.4%) were extrapulmonary specimens. MTB was detected in 1624 (17.17%) sputum and 1121 (20.70%) extrapulmonary specimens of which 409 (25.18%) and 277 (24.71%) were rifampicin resistant respectively.Probe E (83.82%) was the commonest probe responsible for rifampicin resistance followed by D (3.93%) and B (3.79%). Mutation in probe C (0.29%) was very rare. Combination of missing probes like AB (0.73%), DE (1.16%) and ADE (0.14%) was observed. 22 (3.2%) specimens showed presence of all five probes.

Conclusion

Xpert MTB/RIF assay uses various combinations of probe to detect MTB along with rifampicin resistance and is a valuable diagnostic tool. It can become a useful epidemiological tool to identify dynamics of transmission of TB by addition of few more probes to identify mutations at specific codons.  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