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   1493118篇
  免费   108979篇
  国内免费   2419篇
耳鼻咽喉   20903篇
儿科学   50648篇
妇产科学   39706篇
基础医学   213141篇
口腔科学   38658篇
临床医学   132129篇
内科学   302851篇
皮肤病学   33165篇
神经病学   120126篇
特种医学   57103篇
外国民族医学   715篇
外科学   221636篇
综合类   28176篇
现状与发展   1篇
一般理论   482篇
预防医学   116427篇
眼科学   31841篇
药学   109794篇
  32篇
中国医学   3065篇
肿瘤学   83917篇
  2021年   11730篇
  2019年   12883篇
  2018年   19869篇
  2017年   14482篇
  2016年   15479篇
  2015年   17580篇
  2014年   22915篇
  2013年   35228篇
  2012年   51537篇
  2011年   53688篇
  2010年   30557篇
  2009年   27800篇
  2008年   50057篇
  2007年   53641篇
  2006年   52766篇
  2005年   51401篇
  2004年   49799篇
  2003年   47670篇
  2002年   46313篇
  2001年   67626篇
  2000年   70107篇
  1999年   59815篇
  1998年   16138篇
  1997年   14601篇
  1996年   14983篇
  1995年   14140篇
  1994年   13423篇
  1993年   12381篇
  1992年   46714篇
  1991年   45438篇
  1990年   44056篇
  1989年   41802篇
  1988年   38528篇
  1987年   37737篇
  1986年   35033篇
  1985年   33608篇
  1984年   25217篇
  1983年   21219篇
  1982年   12407篇
  1981年   11226篇
  1979年   22254篇
  1978年   15483篇
  1977年   13148篇
  1976年   12194篇
  1975年   13261篇
  1974年   15449篇
  1973年   14897篇
  1972年   13641篇
  1971年   12367篇
  1970年   11664篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
76.
The community pharmacy setting is a venue that is readily accessible to the public. In addition, it is staffed by a pharmacist, who is a healthcare provider, trained and capable of delivering comprehensive pharmaceutical care. As such, community pharmacists have a colossal opportunity to serve as key contributors to patients’ health by ensuring appropriate use of medications, preventing medication misadventures, identifying drug-therapy needs, as well as by being involved in disease management, screening, and prevention programs. This unique position gives the pharmacist the privilege and duty to serve patients in roles other than solely that of the stereotypical drug dispenser.Worldwide, as well as in Israel, pharmacists already offer a variety of pharmaceutical services and tend to patients’ and the healthcare system’s needs. This article provides examples of professional, clinical or other specialty services offered by community pharmacists around the world and in Israel and describes these interventions as well as the evidence for their efficacy. Examples of such activities which were recently introduced to the Israeli pharmacy landscape due to legislative changes which expanded the pharmacist’s scope of practice include emergency supply of medications, pharmacists prescribing, and influenza vaccination. Despite the progress already made, further expansion of these opportunities is warranted but challenging. Independent prescribing, as practiced in the United Kingdom or collaborative drug therapy management programs, as practiced in the United States, expansion of vaccination programs, or wide-spread recognition and reimbursement for medication therapy management (MTM) programs are unrealized opportunities. Obstacles such as time constraints, lack of financial incentives, inadequate facilities and technology, and lack of professional buy-in, and suggested means for overcoming these challenges are also discussed.  相似文献   
77.

Background

Unintentional underfeeding is common in patients receiving enteral nutrition (EN), and is associated with increased risk of malnutrition complications. Protocols for EN in critically ill patients have been shown to enhance adequacy, resulting in better clinical outcomes; however, outside of intensive care unit (ICU) settings, the influence of a protocol for EN is unknown.

Objective

To evaluate the efficacy and safety of implementing an EN protocol in a noncritical setting.

Design

Randomized controlled clinical trial.

Participants and settings

This trial was conducted from 2014 to 2016 in 90 adult hospitalized patients (non-ICU) receiving exclusively EN. Patients with carcinomatosis, ICU admission, or <72 hours of EN were excluded.

Intervention

The intervention group received EN according to a protocol, whereas the control group was fed according to standard practice.

Main outcome measures

The proportion of patients receiving ≥80% of their caloric target at Day 4 after EN initiation.

Statistical analyses performed

Student t test or Wilcoxon rank-sum test were used for continuous variables and the difference between the groups in the time to receipt of the optimal amount of nutrition was analyzed using Kaplan-Meier curves.

Results

Forty-five patients were randomized to each group. At Day 4 after EN initiation, 61% of patients in the intervention arm had achieved the primary end point compared with 23% in the control group (P=0.001). In malnourished patients, 63% achieved the primary end point in the intervention group compared with 16% in the control group (P=0.003). The cumulative deficit on Day 4 was lower in the intervention arm compared with the control arm: 2,507 kcal (interquartile range [IQR]=1,262 to 2,908 kcal) vs 3,844 kcal (IQR=2,620 to 4,808 kcal) (P<0.001) and 116 g (IQR=69 to 151 g) vs 191 g (IQR=147 to 244 g) protein (P<0.001), respectively. The rates of gastrointestinal complications were not significantly different between groups.

Conclusions

Implementation of an EN protocol outside the ICU significantly improved the delivery of calories and protein when compared with current standard practice without increasing gastrointestinal complications.  相似文献   
78.
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   
79.
80.
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