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   547584篇
  免费   29407篇
  国内免费   645篇
耳鼻咽喉   6796篇
儿科学   17421篇
妇产科学   12935篇
基础医学   95524篇
口腔科学   12693篇
临床医学   49993篇
内科学   100050篇
皮肤病学   12189篇
神经病学   35827篇
特种医学   20242篇
外国民族医学   53篇
外科学   79535篇
综合类   7658篇
现状与发展   2篇
一般理论   112篇
预防医学   39945篇
眼科学   12172篇
药学   42728篇
  1篇
中国医学   1186篇
肿瘤学   30574篇
  2021年   4593篇
  2019年   4446篇
  2018年   6344篇
  2017年   4632篇
  2016年   5442篇
  2015年   5966篇
  2014年   7884篇
  2013年   11517篇
  2012年   17216篇
  2011年   19050篇
  2010年   10873篇
  2009年   9633篇
  2008年   17019篇
  2007年   18678篇
  2006年   18124篇
  2005年   17272篇
  2004年   16823篇
  2003年   16044篇
  2002年   15464篇
  2001年   22510篇
  2000年   23017篇
  1999年   19014篇
  1998年   5352篇
  1997年   4462篇
  1996年   4492篇
  1995年   4171篇
  1992年   14441篇
  1991年   15841篇
  1990年   15972篇
  1989年   15635篇
  1988年   14319篇
  1987年   14215篇
  1986年   13179篇
  1985年   12693篇
  1984年   9411篇
  1983年   8012篇
  1982年   4189篇
  1979年   8942篇
  1978年   6387篇
  1977年   5153篇
  1976年   5506篇
  1975年   6620篇
  1974年   7423篇
  1973年   7168篇
  1972年   6597篇
  1971年   6313篇
  1970年   5889篇
  1969年   5469篇
  1968年   5162篇
  1967年   4623篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
International Journal of Diabetes in Developing Countries -  相似文献   
92.
93.

Introduction

The nature of community pharmacy is changing, shifting from the preparation and distribution of medicines to the provision of cognitive pharmaceutical services (CPS); however, often the provision of traditional services leaves little time for innovative services. This study investigated the time community pharmacists spend on the tasks and activities of daily practice and to what extent they are able to implement CPS-related services in daily practice.

Methods

Self-reporting work sampling was used to register the activities of community pharmacists. A smartphone application, designed specifically for this purpose, alerted participants to register their current activity five times per working day for 6 weeks. Participants also completed an online survey about baseline characteristics.

Results

Ninety-one Dutch community pharmacists provided work-sampling data (7848 registered activities). Overall, 51.5% of their time was spent on professional activities, 35.4% on semi-professional activities, and 13.1% on non-professional activities. The proportion of time devoted to CPS decreased during the workweek, whereas the time spent on traditional task increased.

Discussion and conclusion

This study shows it is feasible to collect work-sampling data using smartphone technology. Community pharmacists spent almost half of their time on semi-professional and non-professional activities, activities that could be delegated to other staff members. In practice, the transition to CPS is hampered by competing traditional tasks, which prevents community pharmacists from profiling themselves as pharmaceutical experts in daily practice.  相似文献   
94.
95.
96.
97.
98.
Among the numerous signaling pathways involved in tumorigenesis, PI3K‐AKT‐mTOR is a key one that regulates diverse cellular functions. However, its prognostic value in esophageal carcinoma remains unclear. In our study, we examined the immunohistochemical expression of phosphorylated (p‐) AKT, mTOR, p70S6K and 4E‐BP1 along with the mutational status of PIK3CA and AKT1 genes by High Resolution Melting Analysis and Pyrosequencing in 44 esophageal carcinomas. The results were correlated with the clinicopathological characteristics of the patients in an effort to define their possible prognostic significance. Total p‐mTOR cytoplasmic expression, assessed in 10 random areas, was positively correlated with tumor stage (Kruskal–Wallis ANOVA, I/II vs III/IV, p = 0.0500). Μoreover, maximum p‐mTOR cytoplasmic immunoexpression, estimated in hot spot areas, was positively associated with tumor grade (Mann–Whitney U test, I/II vs III, p = 0.0565). Interestingly, p‐4E‐BP1 immunoreactivity was negatively correlated with tumor histological grade (Mann–Whitney U test, I/II vs III, p = 0.0427). No mutation was observed in exons 9 and 20 of PIK3CA gene and in exon 4 of AKT1 gene. In conclusion, our findings depict the presence of activated PI3K/AKT/mTOR pathway in esophageal cancer bringing forward p‐mTOR and p‐4E‐BP1 for their potential role in esophageal carcinogenesis. Additional studies are warranted to validate our findings.  相似文献   
99.
100.
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