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   643篇
  免费   64篇
  国内免费   7篇
耳鼻咽喉   9篇
儿科学   56篇
妇产科学   39篇
基础医学   85篇
口腔科学   27篇
临床医学   65篇
内科学   139篇
皮肤病学   19篇
神经病学   20篇
特种医学   79篇
外科学   62篇
综合类   18篇
预防医学   20篇
药学   55篇
肿瘤学   21篇
  2023年   2篇
  2022年   9篇
  2021年   15篇
  2020年   5篇
  2019年   7篇
  2018年   13篇
  2017年   7篇
  2016年   11篇
  2015年   14篇
  2014年   25篇
  2013年   27篇
  2012年   15篇
  2011年   22篇
  2010年   46篇
  2009年   29篇
  2008年   22篇
  2007年   17篇
  2006年   18篇
  2005年   23篇
  2004年   15篇
  2003年   13篇
  2002年   10篇
  2001年   8篇
  2000年   9篇
  1999年   12篇
  1998年   30篇
  1997年   36篇
  1996年   36篇
  1995年   29篇
  1994年   19篇
  1993年   18篇
  1992年   3篇
  1991年   3篇
  1990年   5篇
  1989年   15篇
  1988年   19篇
  1987年   19篇
  1986年   13篇
  1985年   15篇
  1984年   8篇
  1983年   4篇
  1982年   7篇
  1981年   10篇
  1980年   4篇
  1979年   2篇
  1977年   5篇
  1976年   8篇
  1975年   2篇
  1968年   3篇
  1954年   1篇
排序方式: 共有714条查询结果,搜索用时 31 毫秒
31.
OBJECTIVE: The aim of the present study was to evaluate serum concentrations of tumor necrosis factor-alpha (TNF-alpha), TNF-soluble receptors, and IL-6 in obese women without additional diseases and obese women with polycystic ovary syndrome (PCOS). STUDY DESIGN: The study group consisted of 39 obese women with PCOS and 34 age-matched obese women without additional disease were included as controls. Blood glucose, total cholesterol, HDL-cholesterol, and triglycerides were measured by the enzymatic procedure. Plasma insulin, follicle-stimulating hormone (FSH), luteinizing hormone (LH), dehydroepiandrosterone sulfate (DHEAS), androstenedione, total and free testosterone, cortisol, progesterone, 17OH-progesterone, estradiol, and sex hormone binding globulin (SHBG) were measured by a commercial radioimmunoassay (RIA). Tumor necrosis factor-alpha (TNF-alpha), soluble TNF receptors (sTNFRs), and IL-6 were determined by an ELISA. RESULTS: We did not observe any differences in serum concentrations of TNF-alpha between obese women with and without PCOS. Serum concentrations of sTNFR1 and sTNFR2 were significantly higher in PCOS patients compared with controls; however, serum concentrations of IL-6 were significantly lower in PCOS patients. CONCLUSIONS: Our findings suggest that PCOS is not associated with chronic inflammation.  相似文献   
32.
33.
34.
Background The repair of an alar nasal defect is a frequent challenge for dermatologic surgeons for reasons of the high rate of non‐melanoma cancers in the area. Objective Our aim was to describe the use of an east–west cheek‐based flap (horizontal advancement flap) to repair a surgical defect on the nose ala. Methods Benefits and limits of this surgical procedure are evaluated. Result The resulting S‐shaped scar was well‐camouflaged among the natural skin lines (melolabial fold and melonasal junction). No architectural distortion of the nose resulted from the procedure. Conclusion In selected patients with small‐to‐medium‐size defects of the nasal ala, the horizontal advancement flap is a simple, reliable and aesthetic reconstruction option.  相似文献   
35.
Knotting of intravascular catheters is an uncommon but a well‐recognized occurrence. The Swan–Ganz catheter (SGC) is the one that knots most commonly. A case of a knotted SGC is described in a patient with a persistent left‐sided superior vena cava, and we propose that the presence of a left‐sided superior vena cava is a risk factor for knot formation not previously reported. We review the published work on the risk factors for knot formation and on the techniques used to remove knotted SGC. We describe a technique using a gooseneck snare and Omni Flush catheter (Angiodynamics, Queensbury, NY, USA) to loosen and untie a knotted SGC.  相似文献   
36.
37.
Thirteen anaemic children on dialysis were assessed to determine the incidence of cardiac changes in end stage renal failure. Nine children had an increased cardiothoracic ratio on radiography. The electrocardiogram was abnormal in every case but no child had left ventricular hypertrophy as assessed by voltage criteria. However, left ventricular hypertrophy, often gross, was found on echocardiography in 12 children and affected the interventricular septum disproportionately. Cardiac index was increased in 10 patients as a result of an increased left ventricular stroke volume rather than heart rate. Left ventricular hypertrophy was significantly greater in those on treatment for hypertension and in those with the highest cardiac index. Abnormal diastolic ventricular function was found in 6/11 children. Children with end stage renal failure have significant cardiac abnormalities that are likely to contribute to the high cardiovascular mortality in this group. Anaemia and hypertension, or its treatment, probably contribute to these changes. Voltage criteria on electrocardiogram are of no value in detecting left ventricular hypertrophy. Echocardiography must be performed, with the results corrected for age and surface area, in order to detect and follow these abnormalities.  相似文献   
38.
39.
40.
Rotator cuff tear: clinical experience with sonographic detection   总被引:5,自引:0,他引:5  
Soble  MG; Kaye  AD; Guay  RC 《Radiology》1989,173(2):319-321
Between June 1986 and April 1988, 86 sonographic examinations of the shoulder were performed on patients suspected of having rotator cuff tears. Major sonographic diagnostic criteria included (a) a well-defined discontinuity usually visible as a hypoechoic focus within the cuff, (b) nonvisualization of the cuff and (c) an echogenic focus within the cuff. Seventy-five patients underwent both sonography and arthrography. Compared with arthrography alone, ultrasound examinations enabled detection of 92% of rotator cuff tears (24 of 26 tears), with a specificity of 84% and a negative predictive value of 95%. Correlation was obtained in 30 of these patients who underwent surgery for rotator cuff tear or other soft-tissue abnormality. In this group, the sensitivity of sonography for detection of a tear was 93%, with a specificity of 73%, while for arthrography sensitivity was 87% and specificity was 100%. These data indicate that sonography is a useful, noninvasive screening procedure for patients suspected of having rotator cuff injury.  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