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   945篇
  免费   35篇
  国内免费   12篇
耳鼻咽喉   12篇
儿科学   103篇
妇产科学   40篇
基础医学   53篇
口腔科学   39篇
临床医学   74篇
内科学   179篇
皮肤病学   31篇
神经病学   58篇
特种医学   39篇
外科学   206篇
综合类   12篇
一般理论   2篇
预防医学   33篇
眼科学   28篇
药学   35篇
中国医学   7篇
肿瘤学   41篇
  2024年   1篇
  2023年   8篇
  2022年   15篇
  2021年   19篇
  2020年   18篇
  2019年   27篇
  2018年   26篇
  2017年   24篇
  2016年   27篇
  2015年   28篇
  2014年   27篇
  2013年   63篇
  2012年   61篇
  2011年   82篇
  2010年   51篇
  2009年   24篇
  2008年   63篇
  2007年   59篇
  2006年   53篇
  2005年   72篇
  2004年   64篇
  2003年   40篇
  2002年   33篇
  2001年   26篇
  2000年   16篇
  1999年   18篇
  1998年   11篇
  1997年   4篇
  1996年   6篇
  1995年   3篇
  1994年   3篇
  1993年   4篇
  1992年   5篇
  1991年   3篇
  1990年   3篇
  1989年   2篇
  1985年   1篇
  1983年   1篇
  1982年   1篇
排序方式: 共有992条查询结果,搜索用时 15 毫秒
61.
Lumbar disc herniation and tight hamstrings syndrome in adolescence   总被引:2,自引:0,他引:2  
BACKGROUND: Lumbar intervertebral disc herniation is infrequently encountered in children and adolescents. Additional signs and symptoms such as postural deformities and abnormal gait accompany the classical findings of lumbar root irritation. These unusual signs have been described in the literature as "tight hamstrings syndrome". Waddling gait with flexed knees is considered as pathognomonic for this condition and may be masked by the signs of root irritation due to prolapsed intervertebral disc material. CASE REPORT AND DISCUSSION: We report an adolescent patient with lumbar disc herniation in whom gait abnormality and limitation of lumbar movements persisted after surgical intervention. A review of the literature on tight hamstrings is presented.  相似文献   
62.
63.
STUDY DESIGN: A case report of cervical tuberculous spondylitis associated with systemic lupus erythematosus (SLE). Infection is a frequent problem in SLE, especially in patients hospitalised with the complications of the disease. Tuberculous spondylitis very rarely occurs in SLE patients, and cervical involvement has not been previously reported. CASE REPORT: A 54-year-old female patient was admitted to our hospital with a complaint of neck pain radiating to her shoulder of 2 months' duration. The neurological examination was completely normal and radiological investigations revealed narrowing, angulation and destruction of the end plates of the 5th and 6th cervical vertebrae. She has received corticosteroid and colchicine treatment for the diagnosis of SLE during the last 10 years. The anterior cervical approach was used and pyogenic material was debrided from the C5-6 intervertebral space, and an otogenous bone graft with a Smith Robinson type fusion was performed. CONCLUSION: High doses of corticosteroids are implicated as a risk factor for infection in SLE patients. Early diagnosis and appropriate medical and surgical treatment, as well as increased awareness of higher susceptibility to opportunistic infections, such as tuberculous spondylitis, are keystones for decreasing morbidity and mortality in patients with SLE.  相似文献   
64.
Enterocutaneous fistula (EF) in newborns and prematures is a well-recognized complication after necrotizing enterocolitis and other abdominal surgical procedures. Conservative management consists of bowel rest, antibiotics, wound care, and the administration of drugs that either reduce gastrointestinal motility or secretions. Octreotide decreases gastrointestinal secretions, inhibits or blocks the effects of gastrointestinal hormones, diminishes gut motility and thus reduces the flow through the fistula. We used octreotide and were able to report successful spontaneous closure of a fistula in our 2 neonatal patients, one a premature neonate with necrotizing enterocolitis (NEC) and the other with meconium peritonitis.  相似文献   
65.
OBJECTIVE: The aim of this work was to determine the radiation dose received by infants from radiographic exposure and the contribution from scatter radiation due to radiographic exposure of other infants in the same room. MATERIALS AND METHODS: We retrospectively evaluated the entrance skin doses (ESDs) and effective doses of 23 infants with a gestational age as low as 28 weeks. ESDs were determined from tube output measurements (ESD(TO)) (n = 23) and from the use of thermoluminescent dosimetry (ESD(TLD)) (n = 16). Scattered radiation was evaluated using a 5 cm Perspex phantom. Effective doses were estimated from ESD(TO) by Monte Carlo computed software and radiation risks were estimated from the effective dose. ESD(TO) and ESD(TLD) were correlated using linear regression analysis. RESULTS: The mean ESD(TO) for the chest and abdomen were 67 microGy and 65 microGy per procedure, respectively. The mean ESD(TLD) per radiograph was 70 microGy. The measured scattered radiation range at a 2 m distance from the neonatal intensive care unit (NICU) was (11-17 microGy) per radiograph. Mean effective doses were 16 and 27 microSv per procedure for the chest and abdomen, respectively. ESD(TLD) was well correlated with ESD(TO) obtained from the total chest and abdomen radiographs for each infant (R(2) = 0.86). The radiation risks for childhood cancer estimated from the effective dose were 0.4 x 10(-6) to 2 x 10(-6) and 0.6 x 10(-6) to 2.9 x 10(-6) for chest and abdomen radiographs, respectively. CONCLUSION: The results of our study show that neonates received acceptable doses from common radiological examinations. Although the contribution of scatter radiation to the neonatal dose is low, considering the sensitivity of the neonates to radiation, further protective action was performed by increasing the distance of the infants from each other.  相似文献   
66.
67.
Rhabdomyosarcoma (RMS) is rare disease in adults (age >or= 16 years). The data from randomized prospective trials are scarce; the clinical outcome of these patients seems poor with the currently available treatment strategies. In this study, we report a single institution's experience in the treatment of adult RMS. We reviewed the medical records of patients with RMS who were >or= 16 years and have been treated in our institution between 1988 and 2003 retrospectively. We analyzed the survival outcome of these patients and the prognostic impact of clinical/pathological factors on their survival. In total, 23 patients with RMS were identified. Median age was 26 years (range, 16-72 years). Majority of patients were male (n: 17, 73.9%), and had large tumors (>or= 5 cm, n: 13, 56.5%), localized disease (N0, M0, n: 12, 52.2%), and embryonal histology (n: 10, 43.5%). Median overall survival was 31.3 months, and the 3-year progression-free survival and overall survival rates were 19.9% and 34.94%, respectively. Patients with smaller tumors (< 5 cm) (p < 0.04), local disease (p < 0.01), and normal lactic dehydrogenase (LDH) level (p < 0.01) at the time of diagnosis were found to have better survival outcome. The tumor size, serum LDH level, and metastatic disease at the time of diagnosis are potential predictors of outcome in patients with adult RMS. Adult RMS is an aggressive disease with poor survival despite treatment. The data from prospective, randomized multicenter trials are necessary in order to improve the clinical outcome of adult RMS patients.  相似文献   
68.
69.
70.

Background

The etiology, biology, prevention and effective treatment of hypertrophic scars have not exactly been defined. Topical zinc oxide application was shown to be effective in the treatment of proliferative scars. We studied the effectiveness of topical zinc oxide ointment in the prevention of hypertrophic scar development by using the rabbit ear hypertrophic scar model.

Methods

Circular full-thickness skin excisions were performed on both ears of 10 rabbits. The rabbits were divided into two groups and topical 40% zinc oxide ointment was applied daily to one ear and the ointment base was applied as placebo to the other ear. Scar samples were taken in the 3rd week in group 1 and in the 6th week in group 2. All of the specimens were divided into two halves: one half for histopathologic/histomorphometric examinations and the other half for biochemical studies.

Results

Application of topical zinc oxide ointment decreased clinical scar hypertrophy scores significantly (p = 0.017) at 6th week in comparison with placebo. Topical zinc oxide also reduced nodule formation histopathologically at 6th week in comparison with placebo but this was not significant statistically (p > 0.05).

Conclusion

The findings of this study may have clinical implications on the management of human hypertrophic scars.  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