全文获取类型
收费全文 | 1784篇 |
免费 | 366篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 36篇 |
妇产科学 | 160篇 |
基础医学 | 39篇 |
口腔科学 | 13篇 |
临床医学 | 1055篇 |
内科学 | 216篇 |
皮肤病学 | 37篇 |
神经病学 | 146篇 |
特种医学 | 51篇 |
外科学 | 108篇 |
综合类 | 27篇 |
预防医学 | 130篇 |
眼科学 | 3篇 |
药学 | 75篇 |
中国医学 | 1篇 |
肿瘤学 | 58篇 |
出版年
2024年 | 11篇 |
2023年 | 61篇 |
2022年 | 10篇 |
2021年 | 45篇 |
2020年 | 36篇 |
2019年 | 19篇 |
2018年 | 98篇 |
2017年 | 104篇 |
2016年 | 108篇 |
2015年 | 105篇 |
2014年 | 115篇 |
2013年 | 117篇 |
2012年 | 65篇 |
2011年 | 69篇 |
2010年 | 80篇 |
2009年 | 99篇 |
2008年 | 65篇 |
2007年 | 68篇 |
2006年 | 53篇 |
2005年 | 49篇 |
2004年 | 47篇 |
2003年 | 38篇 |
2002年 | 29篇 |
2001年 | 47篇 |
2000年 | 35篇 |
1999年 | 44篇 |
1998年 | 42篇 |
1997年 | 64篇 |
1996年 | 58篇 |
1995年 | 54篇 |
1994年 | 41篇 |
1993年 | 31篇 |
1992年 | 29篇 |
1991年 | 23篇 |
1990年 | 33篇 |
1989年 | 19篇 |
1988年 | 15篇 |
1987年 | 15篇 |
1986年 | 14篇 |
1985年 | 10篇 |
1984年 | 11篇 |
1983年 | 8篇 |
1982年 | 10篇 |
1981年 | 10篇 |
1980年 | 5篇 |
1979年 | 7篇 |
1978年 | 6篇 |
1977年 | 6篇 |
1976年 | 9篇 |
1975年 | 9篇 |
排序方式: 共有2157条查询结果,搜索用时 40 毫秒
71.
72.
Evidence of mild hypertension in women and female rats and our preliminary observation showing that training is not effective to reduce pressure in female as it does in male spontaneously hypertensive rats (SHR) prompt us to investigate the effects of gender on hemodynamic pattern and microcirculatory changes induced by exercise training. Female SHR and normotensive controls (Wistar-Kyoto rats) were submitted to training (55% VO(2) peak; 3 months) or kept sedentary and instrumented for pressure and hindlimb flow measurements at rest and during exercise. Heart, kidney, and skeletal muscles (locomotor/nonlocomotor) were processed for morphometric analysis of arterioles, capillaries, and venules. High pressure in female SHR was accompanied by an increased arteriolar wall:lumen ratio in the kidney (+30%; P<0.01) but an unchanged ratio in the skeletal muscles and myocardium. Female SHR submitted to training did not exhibit further changes on the arteriolar wall:lumen ratio and pressure, showing additionally increased hindlimb resistance at rest (+29%; P<0.05). On the other hand, female SHR submitted to training exhibited increased capillary and venular densities in locomotor muscles (+50% and 2.3-fold versus sedentary SHR, respectively) and normalized hindlimb flow during exercise hyperemia. Left ventricle pressure and weight were higher in SHR versus WKY rats, but heart performance (positive dP/dt(max) and negative dP/dt(max)) was not changed by hypertension or training, suggesting a compensated heart function in female SHR. In conclusion, the absence of training-induced structural changes on skeletal muscle and myocardium arterioles differed from changes observed previously in male SHR, suggesting a gender effect. This effect might contribute to the lack of pressure fall in trained female SHRs. 相似文献
73.
A feasibility study on using tablet personal computers for self‐reported symptom assessment in newly diagnosed lung cancer patients
下载免费PDF全文
![点击此处可从《International journal of nursing practice》网站下载免费的PDF全文](/ch/ext_images/free.gif)
74.
The use of psychiatry‐focused simulation in undergraduate nursing education: A systematic search and review
下载免费PDF全文
![点击此处可从《International journal of mental health nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Amanda D. Vandyk RN PhD Michelle Lalonde RN MN PhD Sabrina Merali RN MN Erica Wright MLIS Irmajean Bajnok RN MScN PhD Barbara Davies RN PhD FCAHS 《International journal of mental health nursing》2018,27(2):514-535
Evidence on the use of simulation to teach psychiatry and mental health (including addiction) content is emerging, yet no summary of the implementation processes or associated outcomes exists. The aim of this study was to systematically search and review empirical literature on the use of psychiatry‐focused simulation in undergraduate nursing education. Objectives were to (i) assess the methodological quality of existing evidence on the use of simulation to teach mental health content to undergraduate nursing students, (ii) describe the operationalization of the simulations, and (iii) summarize the associated quantitative and qualitative outcomes. We conducted online database (MEDLINE, Embase, ERIC, CINAHL, PsycINFO from January 2004 to October 2015) and grey literature searches. Thirty‐two simulation studies were identified describing and evaluating six types of simulations (standardized patients, audio simulations, high‐fidelity simulators, virtual world, multimodal, and tabletop). Overall, 2724 participants were included in the studies. Studies reflected a limited number of intervention designs, and outcomes were evaluated with qualitative and quantitative methods incorporating a variety of tools. Results indicated that simulation was effective in reducing student anxiety and improving their knowledge, empathy, communication, and confidence. The summarized qualitative findings all supported the benefit of simulation; however, more research is needed to assess the comparative effectiveness of the types of simulations. Recommendations from the findings include the development of guidelines for educators to deliver each simulation component (briefing, active simulation, debriefing). Finally, consensus around appropriate training of facilitators is needed, as is consistent and agreed upon simulation terminology. 相似文献
75.
76.
Plasma Aluminum Concentrations in Pediatric Patients Receiving Long‐Term Parenteral Nutrition
下载免费PDF全文
![点击此处可从《JPEN. Journal of parenteral and enteral nutrition》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Glenda Courtney‐Martin PhD RD Christina Kosar MN RN Alison Campbell RD Yaron Avitzur MD Paul W. Wales MD MSc Karen Steinberg MN RN Debra Harrison BScN Kathryn Chambers BASc RD 《JPEN. Journal of parenteral and enteral nutrition》2015,39(5):578-585
Background: Patients receiving long‐term parenteral nutrition (PN) are at increased risk of aluminium (Al) toxicity because of bypass of the gastrointestinal tract during PN infusion. Complications of Al toxicity include metabolic bone disease (MBD), Al‐associated encephalopathy in adults, and impaired neurological development in preterm infants. Unlike the United States, there are no regulations regarding Al content of large‐ and small‐volume parenterals in Canada. We, therefore, aimed to present our data on plasma Al concentration and Al intake from our cohort of pediatric patients receiving long‐term PN. Methods: Plasma Al concentration was retrospectively gathered from the patient charts of all 27 patients with intestinal failure (IF) receiving long‐term PN at The Hospital for Sick Children, Toronto, Canada, and compared with age‐ and sex‐matched controls recruited for comparison. In addition, Al concentration was measured in PN samples collected from 10 randomly selected patients with IF and used to determine their Al intake. Results: The plasma Al concentration of patients with IF receiving long‐term PN was significantly higher than that of control participants (1195 ± 710 vs 142 ± 63 nmol/L; P < .0001). In the subgroup of 10 patients for whom Al intake from their PN solution was determined, mean ± SD Al intake from PN was 15.4 ± 15 µg/kg, 3 times the Food and Drug Administration upper recommended intake level, and Al intake was significantly related to plasma Al concentration (P = .02, r2 = 0.52). Conclusion: Pediatric patients receiving long‐term PN for IF in Canada are at risk for Al toxicity. 相似文献
77.
78.
79.
80.