全文获取类型
收费全文 | 406696篇 |
免费 | 56244篇 |
国内免费 | 22797篇 |
专业分类
耳鼻咽喉 | 7102篇 |
儿科学 | 7600篇 |
妇产科学 | 5350篇 |
基础医学 | 35319篇 |
口腔科学 | 5696篇 |
临床医学 | 63716篇 |
内科学 | 83719篇 |
皮肤病学 | 9682篇 |
神经病学 | 29141篇 |
特种医学 | 15658篇 |
外国民族医学 | 198篇 |
外科学 | 64820篇 |
综合类 | 44331篇 |
现状与发展 | 146篇 |
一般理论 | 27篇 |
预防医学 | 22361篇 |
眼科学 | 11430篇 |
药学 | 28974篇 |
303篇 | |
中国医学 | 15637篇 |
肿瘤学 | 34527篇 |
出版年
2024年 | 1280篇 |
2023年 | 8351篇 |
2022年 | 10860篇 |
2021年 | 16946篇 |
2020年 | 16380篇 |
2019年 | 11270篇 |
2018年 | 16761篇 |
2017年 | 15637篇 |
2016年 | 16241篇 |
2015年 | 20332篇 |
2014年 | 30080篇 |
2013年 | 27870篇 |
2012年 | 23997篇 |
2011年 | 26812篇 |
2010年 | 23193篇 |
2009年 | 24067篇 |
2008年 | 18967篇 |
2007年 | 17239篇 |
2006年 | 19924篇 |
2005年 | 17485篇 |
2004年 | 11102篇 |
2003年 | 9503篇 |
2002年 | 8340篇 |
2001年 | 9454篇 |
2000年 | 9406篇 |
1999年 | 10340篇 |
1998年 | 8336篇 |
1997年 | 8165篇 |
1996年 | 7023篇 |
1995年 | 6705篇 |
1994年 | 4824篇 |
1993年 | 3516篇 |
1992年 | 3578篇 |
1991年 | 3237篇 |
1990年 | 2617篇 |
1989年 | 2503篇 |
1988年 | 2143篇 |
1987年 | 1798篇 |
1986年 | 1617篇 |
1985年 | 1318篇 |
1984年 | 891篇 |
1983年 | 731篇 |
1982年 | 626篇 |
1981年 | 524篇 |
1980年 | 440篇 |
1979年 | 397篇 |
1978年 | 328篇 |
1977年 | 396篇 |
1975年 | 277篇 |
1972年 | 302篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Raymond J. Chan RN PhD Vivienne E. Milch MBBS MHPol Fiona Crawford-Williams PhD Oluwaseyifunmi Andi Agbejule BRadTherapy Ria Joseph MNutrDiet Jolyn Johal BND Narayanee Dick BSc Matthew P. Wallen PhD Julie Ratcliffe PhD Anupriya Agarwal MBBS Larissa Nekhlyudov MD Matthew Tieu PhD Manaf Al-Momani BPharm Scott Turnbull PhD Rahul Sathiaraj MPH Dorothy Keefe MBBS MD Nicolas H. Hart PhD 《CA: a cancer journal for clinicians》2023,73(6):565-589
Patient navigation is a strategy for overcoming barriers to reduce disparities and to improve access and outcomes. The aim of this umbrella review was to identify, critically appraise, synthesize, and present the best available evidence to inform policy and planning regarding patient navigation across the cancer continuum. Systematic reviews examining navigation in cancer care were identified in the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, Embase, Cumulative Index of Nursing and Allied Health (CINAHL), Epistemonikos, and Prospective Register of Systematic Reviews (PROSPERO) databases and in the gray literature from January 1, 2012, to April 19, 2022. Data were screened, extracted, and appraised independently by two authors. The JBI Critical Appraisal Checklist for Systematic Review and Research Syntheses was used for quality appraisal. Emerging literature up to May 25, 2022, was also explored to capture primary research published beyond the coverage of included systematic reviews. Of the 2062 unique records identified, 61 systematic reviews were included. Fifty-four reviews were quantitative or mixed-methods reviews, reporting on the effectiveness of cancer patient navigation, including 12 reviews reporting costs or cost-effectiveness outcomes. Seven qualitative reviews explored navigation needs, barriers, and experiences. In addition, 53 primary studies published since 2021 were included. Patient navigation is effective in improving participation in cancer screening and reducing the time from screening to diagnosis and from diagnosis to treatment initiation. Emerging evidence suggests that patient navigation improves quality of life and patient satisfaction with care in the survivorship phase and reduces hospital readmission in the active treatment and survivorship care phases. Palliative care data were extremely limited. Economic evaluations from the United States suggest the potential cost-effectiveness of navigation in screening programs. 相似文献
32.
33.
Guoliang Zhang & Tao Xiong 《Communications In Computational Physics》2022,32(1):126-155
We propose a high order finite difference linear scheme combined with a
high order bound preserving maximum-principle-preserving (MPP) flux limiter to
solve the incompressible flow system. For such problem with highly oscillatory structure but not strong shocks, our approach seems to be less dissipative and much less
costly than a WENO type scheme, and has high resolution due to a Hermite reconstruction. Spurious numerical oscillations can be controlled by the weak MPP flux
limiter. Numerical tests are performed for the Vlasov-Poisson system, the 2D guiding-center model and the incompressible Euler system. The comparison between the linear
and WENO type schemes, with and without the MPP flux limiter, will demonstrate the
good performance of our proposed approach. 相似文献
34.
35.
宫腔积液指宫腔内液体积存(积水、积血或积脓),是绝经后女性常见体征之一,常于超声检查时发现。持续宫腔积液患者,需宫腔镜检查寻找病因。本文报道1例以宫腔积液为首发症状,经宫腔镜检查确诊为胃型宫颈腺癌的患者。通过病例回顾并文献复习,以期为更多绝经后宫腔积液及宫颈病变的诊断提供参考,避免漏诊及误诊。1病例资料患者67岁,女,主因"绝经18年,不规则阴道出血2月"于2020年5月就诊于首都医科大学附属北京妇产医院妇科微创中心。 相似文献
36.
37.
38.
Xiumei Jiang Xiaowei Zhang Patrick Gray Jiwen Zheng Timothy R. Croley Peter P. Fu 《journal of environmental science and health part c-environmental carcinogenesis & ecotoxicology reviews》2019,37(2):116-131
Gold nanoparticles (Au NPs) hold great promise in food, industrial and biomedical applications due to their unique physicochemical properties. However, influences of the gastrointestinal tract (GIT), a likely route for Au NPs administration, on the physicochemical properties of Au NPs has been rarely evaluated. Here, we investigated the influence of GIT fluids on the physicochemical properties of Au NPs (5, 50, and 100?nm) and their implications on intestinal epithelial permeability in vitro. Au NPs aggregated in fasted gastric fluids and generated hydroxyl radicals in the presence of H2O2. Cell studies showed that GIT fluids incubation of Au NPs affected the cellular uptake of Au NPs but did not induce cytotoxicity or disturb the intestinal epithelial permeability. 相似文献
39.
Yan Gao Shi-Feng Chu Zhao Zhang Qi-Di Ai Cong-Yuan Xia Hui-Yong Huang 《Journal of Asian natural products research》2019,21(8):782-797
Inappropriate use of acetaminophen (APAP) can lead to morbidity and mortality secondary to hepatic necrosis. Ginsenoside Rg1 is a major active ingredient in processed Panax ginseng, which is proved to elicit biological effects. We hypothesized the beneficial effect of Rg1 on APAP-mediated hepatotoxicity was through Nrf2/ARE pathway. The study was conducted in cells and mice, comparing the actions of Rg1. Rg1 significantly improved cell survival rates and promoted the expression of antioxidant proteins. Meanwhile, Rg1 reduced the excessive ROS and the occurrence of cell apoptosis, which were related to Nrf2/ARE pathway. Expression of Nrf2 has a certain cell specificity.
40.