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   2706篇
  免费   138篇
  国内免费   24篇
耳鼻咽喉   77篇
儿科学   84篇
妇产科学   140篇
基础医学   236篇
口腔科学   105篇
临床医学   227篇
内科学   589篇
皮肤病学   64篇
神经病学   195篇
特种医学   96篇
外科学   538篇
综合类   41篇
一般理论   1篇
预防医学   88篇
眼科学   112篇
药学   106篇
中国医学   3篇
肿瘤学   166篇
  2024年   8篇
  2023年   21篇
  2022年   29篇
  2021年   46篇
  2020年   35篇
  2019年   54篇
  2018年   57篇
  2017年   69篇
  2016年   86篇
  2015年   101篇
  2014年   127篇
  2013年   160篇
  2012年   204篇
  2011年   222篇
  2010年   111篇
  2009年   108篇
  2008年   194篇
  2007年   248篇
  2006年   201篇
  2005年   187篇
  2004年   137篇
  2003年   116篇
  2002年   101篇
  2001年   45篇
  2000年   49篇
  1999年   27篇
  1998年   9篇
  1997年   11篇
  1996年   10篇
  1995年   3篇
  1993年   2篇
  1992年   8篇
  1991年   8篇
  1990年   6篇
  1989年   6篇
  1988年   4篇
  1987年   4篇
  1986年   2篇
  1985年   2篇
  1984年   2篇
  1982年   4篇
  1981年   6篇
  1979年   2篇
  1978年   2篇
  1977年   3篇
  1973年   4篇
  1972年   5篇
  1970年   5篇
  1968年   2篇
  1967年   3篇
排序方式: 共有2868条查询结果,搜索用时 0 毫秒
91.
The aim of this study was to examine prenatal diagnosis of double-outlet right ventricle (DORV)-associated anomalies and prognosis of each case. Medical records were reviewed of fetuses with DORV who had fetal echocardiography at our institution from 2002 to 2006. Pre- and postnatal diagnosis and outcome were compared and evaluated. Twenty-one fetuses were diagnosed with DORV. The pregnancy was terminated in seven cases. Three cases had chromosomal abnormalities; three cases, hypoplastic left ventricle; and one case, encephalocele. Accurate prenatal diagnosis of the ventricular septal defect, outflow obstruction, and great artery relationship was achieved in 14 of 16 cases (87.5%). Only 2 of 13 live-born cases survived beyond 6 months. The overall prognosis for fetuses with DORV is poor. DORV is found in fetuses with a huge spectrum of associated cardiac and extracardiac anomalies. Careful assessment by fetal echocardiography can determine important anatomic details with adequate correctness for precise counseling.  相似文献   
92.
93.
The use of osseointegration for bone anchorage in the prosthetic management of craniofacial defects has been successfully applied for many years. Different methods can be used for reconstruction of the aural atresia. Nowadays plastic surgery for auricular reconstruction and the bone-anchored episthesis are used for correction of aural atresia. There have been several studies in the literature comparng these techniques. According to those studies, bone-anchored episthesis is an excellent alternative to plastic reconstructive surgery of the auricle. In the present study we present 2 cases with different etiologic factors. The patients' right external ears were absent. There was loss in hearing function in one of the patients. We applied external ear episthesis with a bone-anchored system.  相似文献   
94.
Aslan M  Bicak U  Dogan DG  Dogan M  Yakinci C 《Lupus》2011,20(3):308-310
A rare case of systemic lupus erythematosus (SLE), with massive bilateral pleural effusions and generalized edema as the first manifestations, is reported. The patient was a previously healthy 13-year-old boy. He presented with a history of fever, lack of appetite, gradually increasing fatigue, cough, diffuse edema, and moderate dyspnea. He responded well to corticosteroids with resolution of the pleural effusions, and edema. SLE should always be kept in mind in cases of massive pleural effusions and/or diffuse edema, even in the absence of other clinical manifestations of the disease.  相似文献   
95.
96.
97.
Narrow band imaging (NBI) is an optical filter technology that improves the visibility of capillaries, veins and other subtle tissue structures, by narrowing the bandwidth of spectral transmittance using optical filters. In this short communication, we want to share our preliminary experience in assisted reproductive technology patients where we had used NBI hysteroscopy for the evaluation of uterine cavity abnormalities who had previous IVF failure.  相似文献   
98.

Purpose  

To determine if IVM of oocytes from unstimulated cycle is a treatment option for patients who did not deliver after standard IVF-ET.  相似文献   
99.

Objective

The purpose of this study was to investigate the antiinflammatory and antifibrotic effects of N-nitro l-arginine methyl ester (l-NAME) in experimentally induced myringosclerosis.

Methods

Twenty Wistar albino rats were bilaterally myringotomized and divided randomly into four groups, each including five rats. Group I received no treatment, Group II was treated with topical saline solution, Group III received topical l-NAME and Group IV received intraperitoneally administered l-NAME. After 2 weeks, the tympanic membranes were examined and scored by otomicroscopy regarding the extent of the myringosclerosis. Then the tympanic membranes were harvested and evaluated histopathologically by light microscopy. The intensity of inflammation and degree of myringosclerosis were evaluated, the mean thickness of tympanic membranes were also measured.

Results

The tympanic membranes of Groups I and II showed extensive myringosclerosis in contrast to those of Groups III and IV which had significantly less or no changes (p < 0.05). The inflammation and fibroblastic activity of the lamina propria in the tympanic membranes of Groups III and IV were found to be significantly less pronounced (p < 0.05). The tympanic membranes were found to be significantly thicker in Groups I and II when compared with Groups III and IV (p < 0.05).

Conclusion

Our results showed that both topical and intraperitoneal applications of l-NAME supressed inflammation, reduced fibroblastic proliferation and decreased the formation of myringosclerosis in myringotomized rat tympanic membranes.  相似文献   
100.
Serum sialic acid, hs-CRP and oxidative stress parameters in obese children   总被引:1,自引:0,他引:1  
BACKGROUND: Obesity is a common health problem that is rapidly increasing among children. Obesity is accompanied by a high incidence of atherosclerosis, arterial hypertension and type 2 diabetes mellitus. We tested the hypothesis that the risk for atherosclerosis may be increased in obese children and measured some risk factors for atherosclerosis. PATIENTS AND METHODS: We determined sialic acid levels and investigated correlations with malondialdehyde (MDA), susceptibility to oxidation, total thiol concentrations, glucose and lipid profile in 39 obese (BMI 26.6 +/- 3.9) and 33 sex- and age-matched healthy children (BMI 15.9 +/- 1.7). RESULTS: MDA concentrations, susceptibility to oxidation and hs-CRP were significantly higher in obese children than controls. Sialic acid and total thiol concentrations were higher in controls but this did not reach statistical significance. Total cholesterol, LDL-cholesterol and glucose concentrations were significantly higher in the obese group and there was a positive correlation between BMI and MDA, susceptibility to oxidation, hs-CRP and glucose concentrations, and a negative correlation between BMI and HDL-cholesterol. Although sialic acid levels were not different between the groups, they showed a correlation with hs-CRP. CONCLUSIONS: A higher risk was found in obese children in relation to oxidative stress parameters, hs-CRP and lipid profile, and this risk showed a positive correlation with BMI. These results are important because children will encounter this increased risk for a longer time than adults, and taking care of obesity in childhood is especially important.  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