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   71766篇
  免费   8622篇
  国内免费   371篇
耳鼻咽喉   1245篇
儿科学   1785篇
妇产科学   1906篇
基础医学   7341篇
口腔科学   4138篇
临床医学   9681篇
内科学   15959篇
皮肤病学   1250篇
神经病学   6786篇
特种医学   2730篇
外科学   10029篇
综合类   380篇
现状与发展   12篇
一般理论   44篇
预防医学   6287篇
眼科学   1123篇
药学   3623篇
  1篇
中国医学   65篇
肿瘤学   6374篇
  2024年   213篇
  2023年   1408篇
  2022年   982篇
  2021年   1764篇
  2020年   1948篇
  2019年   1453篇
  2018年   2502篇
  2017年   2338篇
  2016年   2738篇
  2015年   2852篇
  2014年   3676篇
  2013年   4843篇
  2012年   4529篇
  2011年   4681篇
  2010年   3695篇
  2009年   4072篇
  2008年   4003篇
  2007年   4060篇
  2006年   3826篇
  2005年   3697篇
  2004年   3306篇
  2003年   3071篇
  2002年   2803篇
  2001年   796篇
  2000年   615篇
  1999年   853篇
  1998年   1056篇
  1997年   935篇
  1996年   936篇
  1995年   729篇
  1994年   603篇
  1993年   566篇
  1992年   406篇
  1991年   379篇
  1990年   343篇
  1989年   360篇
  1988年   317篇
  1987年   292篇
  1986年   275篇
  1985年   302篇
  1984年   256篇
  1983年   255篇
  1982年   274篇
  1981年   226篇
  1980年   184篇
  1979年   144篇
  1978年   154篇
  1977年   174篇
  1976年   125篇
  1975年   134篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
OBJECTIVE: To illustrate the safety and efficacy of the endoscopic laser approach for cricopharyngeal myotomy (CPM) compared to the traditional transcervical approach. STUDY DESIGN AND SETTING: Retrospective chart review of 22 patients undergoing CPM from 1996 to 2003 at the Mayo Clinic, Jacksonville. RESULTS: The laser CPM technique was used in 14 patients, and an open approach in 8. The mean hospital stay and operative times were shorter for the laser group. Functional outcome analyses showed improvement in both groups. There were no major complications in the laser group, while 1 patient in the transcervical group had a pharyngocutaneous fistula. CONCLUSIONS: The laser technique is at least as effective as the transcervical approach for CPM to improve dysphagia symptoms in the properly selected patient, with a low risk of major complications. SIGNIFICANCE: In this report, we provide the reader with data to support the safety and efficacy of laser CPM. EBM rating: B-3b.  相似文献   
3.
We aimed to evaluate the potential of the cerebrospinal fluid (CSF) axonal damage biomarker NfH(SMI35) in the laboratory-supported differential diagnosis of parkinsonian syndromes. Patients with idiopathic Parkinson's disease (PD; n = 22), multiple-system atrophy (MSA; n = 21), progressive supranuclear palsy (PSP; n = 21), corticobasal degeneration (CBD; n = 6), and age-matched controls (n = 45) were included. CSF levels of NfH(SMI35) were measured using ELISA. Levels of CSF NfH(SMI35) were elevated in PSP compared to PD and controls (P < 0.05 each). They were also significantly higher in MSA than in PD and controls (P < 0.05 each). NfH(SMI35) differentiated PD from PSP with a sensitivity of 76.5% and a specificity of 94.4%. Axonal damage as measured by CSF NfH(SMI35) is most prominent in the more rapidly progressive syndromes PSP and MSA as compared to PD or CBD. CSF NfH(SMI35) may therefore be of some value for the laboratory-supported differential diagnosis of atypical parkinsonian syndromes.  相似文献   
4.
5.
The present study demonstrates that alcohol-induced memory impairment can be attenuated by pretreatment with an oral tryptophan supplementation. These results provide support for the role of a brain serotonin deficit in this impairment and highlight the impact a dietary manipulation can have on a complex behavioral process.  相似文献   
6.
Most prosthetic joint infections (PJI) are due to wound contamination at the time of surgery. Some infections occur due to the hematogenous spread of bacteria from distant sites of infection. A review of the literature fails to associate PJI with transient bacteremias from invasive dental procedures. Several authors have described conditions which, they believe, render patients with prosthetic joints more at risk for infection. Prosthetic joint patients with these "high risk" conditions have the same types of infecting organisms as other patients with PJI. This indicates that the infecting bacteria are from wound contamination or distant sites of infection and not related to dental procedure bacteremias. Based on this review, antibiotic prophylaxis is not indicated for patients with prosthetic joints when receiving invasive dental procedures, since there is no proven benefit and there are known risks involved with the use of antibiotics. However, the American Dental Association (ADA) and the American Academy of Orthopaedic Surgeons (AAOS), in an advisory statement, suggest prophylaxis for "high risk" patients. The ADA and AAOS recommend a single dose of amoxicillin, cephradine, or clindamycin when prophylaxis is selected. The dentist is ultimately responsible for making treatment recommendations for his or her patients.  相似文献   
7.
8.
Trauma und Berufskrankheit - Zusammenfassung Die angemessene Behandlung der Radiusköpfchenfrakturen erfolgt nach korrekter Klassifikation unter Berücksichtigung von Begleitverletzungen...  相似文献   
9.
Society often expects mothers and fathers to share equally in the perinatal grief process because the child was a common bond between them. Unfortunately, in perinatal grief, this is not always the case. The mother and the father can experience incongruent grieving and use discordant coping mechanisms. It is important to evaluate these differences to facilitate communication between the distraught parents. Improved communication can in turn facilitate the grieving process.  相似文献   
10.
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