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   11613篇
  免费   426篇
  国内免费   86篇
耳鼻咽喉   367篇
儿科学   537篇
妇产科学   618篇
基础医学   799篇
口腔科学   424篇
临床医学   941篇
内科学   2634篇
皮肤病学   169篇
神经病学   663篇
特种医学   456篇
外科学   2870篇
综合类   169篇
一般理论   1篇
预防医学   238篇
眼科学   442篇
药学   404篇
中国医学   31篇
肿瘤学   362篇
  2024年   3篇
  2023年   95篇
  2022年   143篇
  2021年   295篇
  2020年   183篇
  2019年   211篇
  2018年   285篇
  2017年   224篇
  2016年   353篇
  2015年   408篇
  2014年   555篇
  2013年   651篇
  2012年   873篇
  2011年   793篇
  2010年   521篇
  2009年   499篇
  2008年   822篇
  2007年   950篇
  2006年   843篇
  2005年   870篇
  2004年   748篇
  2003年   616篇
  2002年   514篇
  2001年   139篇
  2000年   90篇
  1999年   79篇
  1998年   74篇
  1997年   49篇
  1996年   55篇
  1995年   36篇
  1994年   28篇
  1993年   14篇
  1992年   30篇
  1991年   16篇
  1990年   8篇
  1989年   6篇
  1988年   3篇
  1987年   4篇
  1986年   5篇
  1985年   4篇
  1984年   4篇
  1983年   2篇
  1982年   6篇
  1980年   2篇
  1979年   2篇
  1978年   2篇
  1976年   3篇
  1974年   2篇
  1966年   2篇
  1963年   2篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
Introduction Scar endometriosis develops in and is adjacent to surgical scars at the site of previous abdominal operations. The most frequent clinical presentation of the disease is that of a palpable subcutaneous mass near surgical scars associated with cyclic pain and swelling during menses. Endometriosis of the surgical scar is often referred to the general surgeons because the clinical presentation suggests an incisional hernia or other conditions related to the general surgery. Cyclical symptoms such as pain and swelling, in relation to surgical scars, which worsen at the time of menstruation, are nearly pathognomonic of scar endometriosis. However, often the diagnosis of endometriosis is not suggested until after histology has been performed. Case report We present two cases of cutaneous endometriosis that has occurred on the site of previous cesarean section scar area.  相似文献   
22.
Microvascular reconstruction of a cranial defect in a 10-week-old infant, which is the youngest case in the literature, is reported. A latissimus dorsi free muscle flap was transferred to cover the defect and a split thickness skin graft was placed over the muscle flap. Despite the successful flap transfer in this case, microvascular reconstruction in an infant has its own risks and infants should be discussed as a separate entity apart from the other pediatric patients.  相似文献   
23.
Ischemic changes and acute or subacute cardiac failure after arterial switch operation generally results from imperfect transfer of coronary arteries to the neoaorta. Peroperative and early postoperative myocardial ischemia is the main cause of death in these patients. We present an unusual cause of myocardial ischemia and cardiac failure after arterial switch: a congenital coronary artery fistula between the circumflex artery and the right ventricle. The symptoms imitate coronary translocation failure. In differential diagnosis of the coronary perfusion problems encountered after the arterial switch operation, coronary artery fistula should not be forgotten, although it is rare.  相似文献   
24.

Background  

Endophthalmitis is the inflammatory response to invasion of the eye with bacteria or fungi. The incidence of endophthalmitis after cataract surgery varies between 0.072–0.13 percent. Treatment of endophthalmitis with fungal etiology is difficult.  相似文献   
25.
The new calculations on the excitation functions of 61Ni(p,n)61Cu, 62Ni(p,n)62Cu, 64Ni(p,n)64Cu, 63Cu(p,2n)62Zn, 63Cu(p,n)63Zn, 65Cu(p,n)65Zn, 66Zn(p,n)66Ga, 67Zn(p,2n)66Ga, 67Zn(p,n)67Ga and 68Zn(p,n)68Ga reactions have been carried out in the 5-30 MeV proton energy range. The calculations involve the cascade exciton model, preequilibrium nuclear reaction model and exciton model. The calculated results are compared with the experimental data taken from the literature.  相似文献   
26.
27.
Abstract Fructosamine assay, which is used in diagnosing and monitoring diabetic patients, is compared with the hemoglobin and plasma glucose assays in children and adolescent insulin-dependent diabetes mellitus patients. We demonstrated that the gingival index scores were correlated with fructosamine values in insulin-dependent diabetes mellitus patients but not in non-diabetic controls. We also found that there was no correlation between gingivitis scores and fasting plasma glucose and HbAlc values. Periodontitis was found to be rare in diabetic children and adolescents.  相似文献   
28.
29.
OBJECTIVE: The aim of this study was to evaluate the audiovestibular disturbance in patients with systemic lupus erythematosus (SLE). STUDY DESIGN AND SETTING: Twenty-eight patients with SLE and 28 healthy control subjects were included. Pure-tone audiometry, impedance audiometry, and electronystagmography (ENG) were used for baseline evaluation. Laboratory tests were carried out. Cranial and brain stem magnetic resonance imagings (MRI) were undertaken. RESULTS: Nineteen (67%) patients reported audiovestibular symptoms. Sensorineural hearing loss was found in 6 (21%) patients. Abnormal results on ENG were significantly higher (50%) (P < 0.01). Abnormal laboratory data were available from 26 patients (P < 0.05). MRI did not show any pathosis. CONCLUSION: The audiovestibular disturbances in SLE are more prevalent than previously recognized. Although no cause and effect relationship can be established by this type of study, it appears that a relationship exists. SIGNIFICANCE: Audiologic research should be directed toward routine, pure tone audiometry, and ENG assessment for patients with SLE to enable crucial treatment.  相似文献   
30.
OBJECTIVE: The purpose of this study was to investigate the incidence of the retroaortic left renal vein (RLRV) in patients with varicocele. METHODS: The left renal vein was ultrasonographically investigated for the presence of the RLRV in 140 patients with varicocele and a control group of 137 age-matched patients. The main diagnostic criteria for varicocele were the presence of a varicose vein with a diameter of 3 mm or larger at rest and with a reflux lasting more than 2 seconds during the Valsalva maneuver. The RLRV was defined as a posterior course of the left renal vein to the aorta at the level of the origin of the superior mesenteric artery. RESULTS: The RLRV was observed in 13 (9.3%) of the 140 patients with varicocele and 3 (2.2%) of the control patients. The incidence of the RLRV was found to be significantly higher in patients with varicocele compared with the control patients (P = .018, Fisher exact test). In 13 patients with the RLRV, left varicocele and bilateral varicocele were detected in 10 and 3 cases, respectively. CONCLUSIONS: In this study, the incidence of the RLRV was found to be significantly higher in patients with varicocele compared with control patients. Thus, we suggest that the presence of the RLRV may be considered one of the etiologic factors in the development of varicocele.  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