全文获取类型
收费全文 | 253180篇 |
免费 | 19833篇 |
国内免费 | 837篇 |
专业分类
耳鼻咽喉 | 3612篇 |
儿科学 | 7228篇 |
妇产科学 | 5172篇 |
基础医学 | 33674篇 |
口腔科学 | 5499篇 |
临床医学 | 27035篇 |
内科学 | 50665篇 |
皮肤病学 | 4057篇 |
神经病学 | 23942篇 |
特种医学 | 8793篇 |
外国民族医学 | 23篇 |
外科学 | 37067篇 |
综合类 | 3903篇 |
现状与发展 | 3篇 |
一般理论 | 266篇 |
预防医学 | 22066篇 |
眼科学 | 6531篇 |
药学 | 17871篇 |
1篇 | |
中国医学 | 272篇 |
肿瘤学 | 16170篇 |
出版年
2021年 | 3514篇 |
2020年 | 2460篇 |
2019年 | 3924篇 |
2018年 | 4697篇 |
2017年 | 3395篇 |
2016年 | 3888篇 |
2015年 | 4610篇 |
2014年 | 6629篇 |
2013年 | 10273篇 |
2012年 | 14609篇 |
2011年 | 15721篇 |
2010年 | 8685篇 |
2009年 | 8089篇 |
2008年 | 14526篇 |
2007年 | 15590篇 |
2006年 | 14982篇 |
2005年 | 15366篇 |
2004年 | 14543篇 |
2003年 | 13821篇 |
2002年 | 13359篇 |
2001年 | 4137篇 |
2000年 | 3842篇 |
1999年 | 3858篇 |
1998年 | 2847篇 |
1997年 | 2377篇 |
1996年 | 2088篇 |
1995年 | 2271篇 |
1994年 | 2136篇 |
1993年 | 2001篇 |
1992年 | 3061篇 |
1991年 | 2948篇 |
1990年 | 2693篇 |
1989年 | 2635篇 |
1988年 | 2565篇 |
1987年 | 2463篇 |
1986年 | 2482篇 |
1985年 | 2548篇 |
1984年 | 2542篇 |
1983年 | 2359篇 |
1982年 | 2396篇 |
1981年 | 2161篇 |
1980年 | 1963篇 |
1979年 | 1935篇 |
1978年 | 1736篇 |
1977年 | 1509篇 |
1976年 | 1377篇 |
1975年 | 1254篇 |
1974年 | 1424篇 |
1973年 | 1198篇 |
1972年 | 1095篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome. 相似文献
12.
13.
14.
15.
16.
Hisham F. Bahmad Robert Poppiti John Alexis 《Diabetes & Metabolic Syndrome: Clinical Research & Reviews》2021,15(2):487-491
Background and aimsDiabetes mellitus (DM) is a chronic metabolic disease associated with long-term multisystem complications, among which nonhealing diabetic foot ulcers (DFUs) are recognized as major cause of morbidity and mortality. Treating DFUs with surgical procedures such as synthetic or biological skin grafts or skin substitutes has several limitations, where none of the currently available skin substitutes is ideal.MethodsOVID/Medline and PubMed databases were searched using the Medical Subject Heading (MeSH) or Title/Abstract words (“diabetic foot ulcers”, “skin substitutes”, and “nanofibers”), to identify published research studies on DFUs and nanofibers.ResultsElectrospinning nanotechnology is being used in the biomedical field to produce polymeric nanofibers impregnated with drugs for wound healing, burns and diabetic ulcers. Those nanofibers also enable seeding of cells into them and culturing them in vitro to synthesize tissue-like structures. Knowing the advantages of generating patient-specific induced pluripotent stem cells (iPSCs) and organoids in three-dimension (3D), including skin organoids, it is worth mingling these technologies to develop tissue-engineered biological skin substitutes.ConclusionNanofiber-skin substitutes hold promise for treatment of patients suffering from DFUs and inspire novel strategies that could be applied to other organ systems as well, introducing a new era of “regenerative and personalized medicine”. 相似文献
17.
18.
19.
Girish B Nair Craig J Galban Sayf Al-Katib Robert Podolsky Maarten van den Berge Craig Stevens Edward Castillo 《The British journal of radiology》2021,94(1118)
Objective:To evaluate CT-ventilation imaging (CTVI) within a well-characterized, healthy cohort with no respiratory symptoms and examine the correlation between CTVI and concurrent pulmonary function test (PFT).Methods:CT scans and PFTs from 77 Caucasian participants in the NORM dataset (clinicaltrials.gov ) were analyzed. CTVI was generated using the robust Integrated Jacobian Formulation (IJF) method. IJF estimated total lung capacity (TLC) was computed from CTVI. Bias-adjusted Pearson’s correlation between PFT and IJF-based TLC was computed.Results:IJF- and PFT-measured TLC showed a good correlation for both males and females [males: 0.657, 95% CI (0.438–0.797); females: 0.667, 95% CI (0.416–0.817)]. When adjusting for age, height, smoking, and abnormal CT scan, correlation moderated [males: 0.432, 95% CI (0.129–0.655); females: 0.540, 95% CI (0.207–0.753)]. Visual inspection of CTVI revealed participants who had functional defects, despite the fact that all participant had normal high-resolution CT scan.Conclusion:In this study, we demonstrate that IJF computed CTVI has good correlation with concurrent PFT in a well-validated patient cohort with no respiratory symptoms.Advances in knowledge:IJF-computed CTVI’s overall numerical robustness and consistency with PFT support its potential as a method for providing spatiotemporal assessment of high and low function areas on volumetric non-contrast CT scan. NCT00848406相似文献