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   10121898篇
  免费   630056篇
  国内免费   162196篇
耳鼻咽喉   130946篇
儿科学   282477篇
妇产科学   231801篇
基础医学   1254568篇
口腔科学   264564篇
临床医学   1023929篇
内科学   1697857篇
皮肤病学   203774篇
神经病学   730636篇
特种医学   377461篇
外国民族医学   1679篇
外科学   1331186篇
综合类   710164篇
现状与发展   514篇
一般理论   3725篇
预防医学   813033篇
眼科学   230555篇
药学   866602篇
  2845篇
中国医学   211708篇
肿瘤学   544126篇
  2023年   53758篇
  2022年   131509篇
  2021年   200748篇
  2020年   143372篇
  2019年   146309篇
  2018年   178324篇
  2017年   158701篇
  2016年   153097篇
  2015年   191057篇
  2014年   278335篇
  2013年   369783篇
  2012年   522577篇
  2011年   566812篇
  2010年   384263篇
  2009年   345638篇
  2008年   482712篇
  2007年   502934篇
  2006年   480195篇
  2005年   442481篇
  2004年   388836篇
  2003年   360460篇
  2002年   332287篇
  2001年   312373篇
  2000年   310972篇
  1999年   266547篇
  1998年   111303篇
  1997年   97897篇
  1996年   91837篇
  1995年   83891篇
  1994年   76044篇
  1993年   65095篇
  1992年   183048篇
  1991年   177080篇
  1990年   171751篇
  1989年   166728篇
  1988年   154103篇
  1987年   150165篇
  1986年   142947篇
  1985年   136198篇
  1984年   103706篇
  1983年   89036篇
  1982年   56706篇
  1979年   93081篇
  1978年   66788篇
  1977年   57597篇
  1975年   58435篇
  1974年   67409篇
  1973年   64317篇
  1972年   59446篇
  1971年   55067篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
962.
963.
964.
965.
966.
Cultures of performativity may contribute to organizational and individual arrogance. Workplace organizations have individuals who at various times will display arrogance, which may manifest in behaviours, such as an exaggerated sense of self-importance, dismissiveness of others, condescending behaviors and an impatient manner. Arrogance is not a flattering label and irrespective of the reason or the position of power, in the context of organizational behaviors, may not be useful and may even be detrimental to the work environment. Thus, it is timely to reflect on the implications of arrogance in the workplace. Advocacy and empowerment can be undermined and relationships adversely impacted, including the achievement of positive consumer outcomes. This paper provides an introduction to arrogance, and then discusses arrogance to promote awareness of the potential consequences of arrogance and its constituent behaviors.  相似文献   
967.
The outbreaks of rabies in humans transmitted by Desmodus rotundus in 2004 and 2005, in the northeast of the Brazilian State of Para, eastern Amazon basin, made this a priority area for studies on this zoonosis. Given this, the present study provides data on this phenomenon in an urban context, in order to assess the possible circulation of the classic rabies virus (RABV) among bat species in Capanema, a town in the Amazon basin. Bats were collected, in 2011, with mist nets during the wet and dry seasons. Samples of brain tissue and blood were collected for virological and serological survey, respectively. None of the 153 brain tissue samples analyzed tested positive for RABV infection, but 50.34% (95% CI: 45.67-55.01%) of the serum samples analyzed were seropositive. Artibeus planirostris was the most common species, with a high percentage of seropositive individuals (52.46%, 95% CI: 52.31 52.60%). Statistically, equal proportions of seropositive results were obtained in the rainy and dry seasons (c2 = 0.057, d.f. = 1, p = 0.88). Significantly higher proportions of males (55.96%, 95% CI: 48.96-62.96%) and adults (52.37%, 95% CI: 47.35-57.39%) were seropositive. While none of the brain tissue samples tested positive for infection, the high proportion of seropositive specimens indicates that RABV may be widespread in this urban area.  相似文献   
968.
目的探讨扬州地区肝硬化食管静脉曲张初次出血患者诊治特点。方法回顾性分析2010年1月-2013年12月苏北人民医院消化内科收治的80例肝硬化食管静脉曲张初次出血患者病例资料。计数资料用率或构成比表示,率的比较采用χ2检验。结果由乙型肝炎导致肝硬化所引起的食管静脉曲张破裂出血所占比例最大;三腔二囊管临床运用可最大限度地挽救患者生命,为后期治疗提供时间;基础治疗包括止血、输血、抑酸、补液等,后期以硬化剂、套扎、硬化剂+套扎、手术、经颈静脉肝内门体分流术(TIPS)为主,但套扎运用最为广泛;患者出血初期各项指标变化有利于指导临床治疗,对患者预后具有良好的评估作用。结论扬州地区肝硬化引起的食管静脉曲张破裂出血病因呈现复杂交叉性,治疗方法仍需进一步完善,以达到个体化治疗水平;及时正确的救治,对提高临床疗效、降低病死率有重要意义;早期的健康体检,对疾病诊治起关键性的作用。  相似文献   
969.
The aim of this study was to evaluate whether the lesion regression rate (ΔLR) based on the Response Evaluation Criteria in Solid Tumors (RECIST) criteria could be used for the prediction of treatment outcome in head and neck squamous cell carcinoma (HNSCC) patients treated with chemoradiotherapy (CRT) compared with FDG PET-CT. A total of 33 patients underwent MRI and PET-CT at pretreatment and at 8 weeks after CRT. We assessed the treatment outcome by analyzing the following parameters: the RECIST criteria, ΔLR, the European Organization for Research and Treatment of Cancer (EORTC) criteria, and pretreatment SUVmax of the primary tumor and node. The correlation between the analysis of the parameters and the results of the long-term follow-up of the patients was determined. The RECIST did not significantly correlate with locoregional control (LRC) or survival. The ΔLR was significantly lower for the lesions with locoregional failure (LRF) than for those with LRC. A threshold ΔLR of 48% revealed a sensitivity of 72.7% and specificity of 77.3% for the prediction of LRF. Progression-free survival (PFS) of patients with ΔLR ≥ 48% was significantly better than that of patients with ΔLR < 48% (P = 0.001), but not overall survival. There was a significant correlation between LRC and the EORTC (P = 0.02). The patients who achieved a complete response by the EORTC criteria showed significantly better PFS and overall survival (P = 0.01 and 0.04, respectively). The ΔLR was inferior to FDG PET-CT with respect to the prediction of patient survival; however, it may be useful for selecting patients in need of more aggressive monitoring after CRT.  相似文献   
970.
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