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   1439139篇
  免费   107212篇
  国内免费   4643篇
耳鼻咽喉   18164篇
儿科学   46256篇
妇产科学   38013篇
基础医学   210948篇
口腔科学   38013篇
临床医学   140251篇
内科学   279892篇
皮肤病学   27904篇
神经病学   122071篇
特种医学   51637篇
外国民族医学   370篇
外科学   198831篇
综合类   30508篇
现状与发展   2篇
一般理论   615篇
预防医学   123885篇
眼科学   31487篇
药学   106146篇
  36篇
中国医学   3354篇
肿瘤学   82611篇
  2021年   12861篇
  2019年   13295篇
  2018年   18230篇
  2017年   13747篇
  2016年   14874篇
  2015年   17188篇
  2014年   23663篇
  2013年   36482篇
  2012年   50488篇
  2011年   53592篇
  2010年   30900篇
  2009年   28635篇
  2008年   49127篇
  2007年   52061篇
  2006年   52027篇
  2005年   50688篇
  2004年   48295篇
  2003年   46065篇
  2002年   44480篇
  2001年   61822篇
  2000年   63320篇
  1999年   53291篇
  1998年   16000篇
  1997年   14418篇
  1996年   14042篇
  1995年   13391篇
  1994年   12412篇
  1993年   11675篇
  1992年   42189篇
  1991年   41317篇
  1990年   39966篇
  1989年   37856篇
  1988年   35059篇
  1987年   34153篇
  1986年   32599篇
  1985年   31195篇
  1984年   23714篇
  1983年   20257篇
  1982年   12680篇
  1981年   11144篇
  1979年   21179篇
  1978年   15302篇
  1977年   12515篇
  1976年   12231篇
  1975年   12448篇
  1974年   15112篇
  1973年   14715篇
  1972年   13538篇
  1971年   12536篇
  1970年   11609篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
95.
96.
97.
98.
The predominant use of glucose anaerobically by cancer cells (Warburg effect) may be the most important characteristic the majority of these cells have in common and, therefore, a potential metabolic pathway to be targeted during cancer treatment. Because this effect relates to fuel oxidation, dietary manipulation has been hypothesized as an important strategy during cancer treatment. As such, the concept of a ketogenic diet (KD) in cancer emerged as a metabolic therapy (ie, targeting cancer cell metabolism) rather than a dietary approach. The therapeutic mechanisms of action of this high-fat, moderate-to-low protein, and very-low-carbohydrate diet may potentially influence cancer treatment and prognosis. Considering the lack of a dietetics-focused narrative review on this topic, we compiled the evidence related to the use of this diet in humans with diverse cancer types and stages, also focusing on the nutrition and health perspective. The use of KD in cancer shows potentially promising, but inconsistent, results. The limited number of studies and differences in study design and characteristics contribute to overall poor quality evidence, limiting the ability to draw evidence-based conclusions. However, the potential positive influences a KD may have on cancer treatment justify the need for well-designed clinical trials to better elucidate the mechanisms by which this dietary approach affects nutritional status, cancer prognosis, and overall health. The role of registered dietitian nutritionists is demonstrated to be crucial in planning and implementing KD protocols in oncology research settings, while also ensuring patients’ adherence and optimal nutritional status.  相似文献   
99.

Background

Malnutrition is a significant problem for hospitalized patients. However, the true prevalence of reported malnutrition diagnosis in real-world clinical practice is largely unknown. Using a large collaborative multi-institutional database, the rate of malnutrition diagnosis was assessed and used to assess institutional variables associated with higher rates of malnutrition diagnosis.

Objective

The aim of this study was to define the prevalence of malnutrition diagnosis reported among inpatient hospitalizations.

Design

The University Health System Consortium (Vizient) database was retrospectively reviewed for reported rates of malnutrition diagnosis.

Participants/setting

All adult inpatient hospitalization at 105 member institutions during fiscal years 2014 and 2015 were evaluated.

Main outcome measures

Malnutrition diagnosis based on the presence of an International Classification of Diseases-Ninth Revision diagnosis code.

Statistical analysis

Hospital volume and publicly available hospital rankings and patient satisfaction scores were obtained. Multiple regression analysis was performed to assess the association between these variables and reported rates of malnutrition.

Results

A total of 5,896,792 hospitalizations were identified from 105 institutions during the 2-year period. It was found that 292,754 patients (5.0%) had a malnutrition diagnosis during their hospital stay. By institution, median rate of malnutrition diagnosis during hospitalization was 4.0%, whereas the rate of severe malnutrition diagnosis was 0.9%. There was a statistically significant increase in malnutrition diagnosis from 4.0% to 4.9% between 2014 and 2015 (P<0.01). Institutional factors associated with increased diagnosis of malnutrition were higher hospital volume, hospital ranking, and patient satisfaction scores (P<0.01).

Conclusions

Missing a malnutrition diagnosis appears to be a universal issue because the rate of malnutrition diagnosis was consistently low across academic medical centers. Institutional variables were associated with the prevalence of malnutrition diagnosis, which suggests that institutional culture influences malnutrition diagnosis. Quality improvement efforts aimed at improved structure and process appear to be needed to improve the identification of malnutrition.  相似文献   
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