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   193803篇
  免费   2154篇
  国内免费   94篇
耳鼻咽喉   1295篇
儿科学   6880篇
妇产科学   3218篇
基础医学   19076篇
口腔科学   2195篇
临床医学   14064篇
内科学   34628篇
皮肤病学   1192篇
神经病学   18399篇
特种医学   10113篇
外科学   31842篇
综合类   2410篇
一般理论   7篇
预防医学   18883篇
眼科学   3133篇
药学   10467篇
中国医学   676篇
肿瘤学   17573篇
  2023年   130篇
  2022年   249篇
  2021年   551篇
  2020年   367篇
  2019年   449篇
  2018年   22389篇
  2017年   17723篇
  2016年   20001篇
  2015年   1561篇
  2014年   1591篇
  2013年   1768篇
  2012年   8479篇
  2011年   22357篇
  2010年   19640篇
  2009年   12246篇
  2008年   20703篇
  2007年   22963篇
  2006年   1826篇
  2005年   3352篇
  2004年   4424篇
  2003年   5295篇
  2002年   3322篇
  2001年   497篇
  2000年   560篇
  1999年   372篇
  1998年   364篇
  1997年   346篇
  1996年   182篇
  1995年   157篇
  1994年   164篇
  1993年   111篇
  1992年   114篇
  1991年   135篇
  1990年   187篇
  1989年   131篇
  1988年   123篇
  1987年   101篇
  1986年   81篇
  1985年   68篇
  1984年   46篇
  1983年   46篇
  1982年   60篇
  1980年   56篇
  1974年   33篇
  1970年   29篇
  1969年   30篇
  1938年   60篇
  1934年   32篇
  1932年   57篇
  1930年   46篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
181.
182.
Conclusions  Noninvasive imaging of neurohumoral upregulation in remodeled myocardium suggests that an imaging strategy can be developed for predicting the rate of remodeling and likelihood of HF development. This should allow a more judicious use of neurohumoral antagonists especially in subjects who do not have manifest HF.74 In others specific targeted imaging may allow timely selection of individualized treatment strategies and ensure optimization of therapeutic intervention. Similar to ACE and AII receptors, multiple other targets in the hormonal cascades can identify the likelihood of adverse and favorable remodeling.74  相似文献   
183.
Two successful cases of the surgical treatment for coronary artery aneurysm (non-Kawasaki disease) were reported. The first case had a saccular aneurysm on the left circumflex coronary artery (LCx) #14. Resection of the LCx aneurysm was performed subsequent to single vessel coronary artery bypass grafting (CABG) to the distal portion of LCx#14 under the cardioplegic cardiac arrest. The second case had aneurysms on both the left anterior descending artery (LAD) #7 (fusiform) and the LCx#11 (saccular). After double vessel CABG to LAD#7 and LCx#11, ligation or resection of two aneurysms was performed successfully. Postoperative courses have been uneventful with good angiographic results achieved. Since these surgical procedures demonstrated safety, the patients are expected to achieve a good long-term prognosis.  相似文献   
184.
Late-onset chylothorax occurred 49 days after right lower lobectomy for lung cancer in a 76-year-old man. Chylothorax was successfully managed by conservative treatment with chest tube drainage and an enteral low-fat diet. Chylothorax may occur in the late period after pulmonary resection and systematic mediastinal lymph node dissection for lung cancer, for which conservative management is the treatment of choice.  相似文献   
185.
Proteinuria 1 year after transplantation is associated with poor renal outcome. It is unclear whether low-grade (<1 g/24 h) proteinuria earlier after transplantation and its short-term change affect long-term graft survival. The effects of proteinuria and its change on long-term graft survival were retrospectively assessed in 484 renal transplant recipients. One- and 3-month proteinuria correlated with donor age, donor cardiovascular death, prolonged cold and warm ischemia times and acute rejection. One- and 3-month proteinuria (per 0.1 g/24 h, hazard ratio (HR): 1.07 and 1.15, p<0.0001)-especially low-grade proteinuria (HR: 1.20 and 1.26, p<0.0001)-were powerful, independent predictors of graft loss. Its short-term reduction correlated with arterial pressure (AP) (the lower the 3-month diastolic and 12-month systolic AP, the lower the risk of increasing proteinuria during 1-3 months and 3-12 months periods, respectively: Odds ratio (OR) per 10 MmHg: 0.78, p=0.01 and 0.85, respectively, p=0.02), and was associated with decreased long-term graft loss (per 0.1 g/24 h: HR: 0.88 and 0.98, respectively, p<0.0001), independently of initial proteinuria. Early low-grade proteinuria due to pre-transplant renal lesions, ischemia-reperfusion and immunologic injuries is a potent predictor of graft loss. Short-term reduction in proteinuria is associated with improved long-term graft survival.  相似文献   
186.
Lymphedema is an under-recognized, progressive, life-long condition estimated to impact 2-3 million people in the United States. The incidence of breast cancer related lymphedema varies greatly in the literature largely due to different measurement techniques, competing thresholds for defining lymphedema, and variation in length of follow-up. Multiple imaging techniques have become useful for diagnosis. Lymphoscintigraphy is one of the most commonly used, as it can identify pathways of lymphatic drainage, quantify extent of dermal backflow, and help determine functional and morphologic changes in the lymphatic system. Early detection and intervention hold the greatest promise of reducing the incidence of lymphedema. Health care providers involved with cancer patients need to become more educated about lymphedema, aware of current risk-reduction practices, and familiar with methods of diagnosis and assessment, so that patients with early swelling can be referred to lymphedema treatment specialists at a time when treatment is more effective.  相似文献   
187.
188.

Objective  

To investigate an initial approach of radiotherapy, which produces cellular radiation injury by high dose in one fraction.  相似文献   
189.

Background  

Nasal NK/T cell lymphoma is an aggressive disease and has a poor prognosis. Nasal NK/T cell lymphoma is refractory to conventional chemotherapy and has strong tendency of widespread relapse or dissemination into distant sites.  相似文献   
190.

Background  

Colorectal cancer, if detected early, has greater than 90% 5-year survival. However, survival has been shown to vary across racial/ethnic groups in the United States, despite the availability of early detection methods.  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