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   1652064篇
  免费   124995篇
  国内免费   7467篇
耳鼻咽喉   23327篇
儿科学   51973篇
妇产科学   44247篇
基础医学   231400篇
口腔科学   45235篇
临床医学   144099篇
内科学   330705篇
皮肤病学   35974篇
神经病学   125671篇
特种医学   64690篇
外国民族医学   735篇
外科学   252502篇
综合类   46218篇
现状与发展   20篇
一般理论   427篇
预防医学   115407篇
眼科学   37392篇
药学   127827篇
  58篇
中国医学   8154篇
肿瘤学   98465篇
  2019年   12607篇
  2018年   18176篇
  2017年   14285篇
  2016年   15068篇
  2015年   17687篇
  2014年   24537篇
  2013年   35201篇
  2012年   48399篇
  2011年   50797篇
  2010年   31403篇
  2009年   29643篇
  2008年   47624篇
  2007年   50913篇
  2006年   50927篇
  2005年   48624篇
  2004年   46673篇
  2003年   45226篇
  2002年   43996篇
  2001年   89040篇
  2000年   91970篇
  1999年   77417篇
  1998年   20002篇
  1997年   17743篇
  1996年   17626篇
  1995年   16618篇
  1994年   15570篇
  1993年   14313篇
  1992年   58763篇
  1991年   56586篇
  1990年   54766篇
  1989年   52685篇
  1988年   48167篇
  1987年   47074篇
  1986年   43660篇
  1985年   41587篇
  1984年   30338篇
  1983年   25341篇
  1982年   14131篇
  1981年   12664篇
  1979年   26317篇
  1978年   17879篇
  1977年   15249篇
  1976年   13705篇
  1975年   15043篇
  1974年   17486篇
  1973年   16768篇
  1972年   15575篇
  1971年   14283篇
  1970年   13406篇
  1969年   12423篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
2.

Physical activity brings significant health benefits to middle-aged adults, although the research to date has been focused on late adulthood. This study aims to examine how ageing affects the self-reported and accelerometer-derived measures of physical activity levels in middle-aged adults. We employed the data recorded in the UK Biobank and analysed the physical activity levels of 2,998 participants (1381 men and 1617 women), based on self-completion questionnaire and accelerometry measurement of physical activity. We also assessed the musculoskeletal health of the participants using the dual-energy X-ray absorptiometry (DXA) measurements provided by the UK Biobank. Participants were categorised into three groups according to their age: group I younger middle-aged (40 to 49 years), group II older middle-aged (50 to 59 years), and group III oldest middle-aged (60 to 69 years). Self-reported physical activity level increased with age and was the highest in group III, followed by group II and I (P?<?0.05). On the contrary, physical activity measured by accelerometry decreased significantly with age from group I to III (P?<?0.05), and the same pertained to the measurements of musculoskeletal health (P?<?0.05). It was also shown that middle-aged adults mostly engaged in low and moderate intensity activities. The opposing trends of the self-reported and measured physical activity levels may suggest that middle-aged adults over-report their activity level as they age. They should be aware of the difference between their perceived and actual physical activity levels, and objective measures would be useful to prevent the decline in musculoskeletal health.

  相似文献   
3.
4.
黄晓云  陈玲 《现代肿瘤医学》2022,(21):3944-3947
目的:探讨初诊急性白血病患者化疗期间应用伏立康唑进行预防侵袭性真菌病(IFD)的临床疗效及安全性。方法:回顾性分析2016年02月至2018年03月期间我院血液科收治的初诊急性白血病行化疗的患者166例,按照是否使用抗真菌药进行预防性治疗分为观察组(应用伏立康唑进行预防治疗,n=103)和对照组(未应用抗真菌药物,n=63),比较两组患者IFD发生率差异,并分析抗真菌药物应用的不良反应。结果:观察组IFD发生率为10.7%,对照组为33.3%,两组患者的IFD发生率有明显差异(P<0.05);所有应用伏立康唑进行预防治疗的患者均未出现严重的不良反应。结论:伏立康唑可以有效减低急性白血病患者化疗期间IFD发生率,并且有着较好的安全性,值得在临床推广应用。  相似文献   
5.
6.
7.
8.
9.
10.
Over the last 40 years, the incidence and prevalence of gastroenteropancreatic neuroendocrine neoplasms (GEP-NENs) have continued to increase. Compared to other epithelial neoplasms in the same organ, GEP-NENs exhibit indolent biological behavior, resulting in more chances to undergo surgery. However, the role of surgery in high-grade or advanced GEP-NENs is still controversial. Surgery is associated with survival improvement of well-differentiated high-grade GEP-NENs, whereas poorly differentiated GEP-NENs that may benefit from resection require careful selection based on Ki67 and other tissue biomarkers. Additionally, surgery also plays an important role in locally advanced and metastatic disease. For locally advanced GEP-NENs, isolated major vascular involvement is no longer an absolute contraindication. In the setting of metastatic GEP-NENs, radical intended surgery is recommended for patients with low-grade and resectable metastases. For unresectable metastatic disease, a variety of surgical approaches, including cytoreduction of liver metastasis, liver transplantation, and surgery after neoadjuvant treatment, show survival benefits. Primary tumor resection in GEP-NENs with unresectable metastatic disease is associated with symptom control, prolonged survival, and improved sensitivity toward systemic therapies. Although there is no established neoadjuvant or adjuvant strategy, increasing attention has been given to this emerging research area. Some studies have reported that neoadjuvant therapy effectively reduces tumor burden, improves the effectiveness of subsequent surgery, and decreases surgical complications.  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