全文获取类型
收费全文 | 16529篇 |
免费 | 1195篇 |
国内免费 | 120篇 |
专业分类
耳鼻咽喉 | 120篇 |
儿科学 | 603篇 |
妇产科学 | 471篇 |
基础医学 | 2220篇 |
口腔科学 | 306篇 |
临床医学 | 1851篇 |
内科学 | 3068篇 |
皮肤病学 | 235篇 |
神经病学 | 1227篇 |
特种医学 | 507篇 |
外科学 | 2530篇 |
综合类 | 644篇 |
一般理论 | 7篇 |
预防医学 | 1187篇 |
眼科学 | 379篇 |
药学 | 970篇 |
1篇 | |
中国医学 | 81篇 |
肿瘤学 | 1437篇 |
出版年
2023年 | 143篇 |
2022年 | 203篇 |
2021年 | 386篇 |
2020年 | 271篇 |
2019年 | 376篇 |
2018年 | 413篇 |
2017年 | 311篇 |
2016年 | 349篇 |
2015年 | 409篇 |
2014年 | 544篇 |
2013年 | 714篇 |
2012年 | 1069篇 |
2011年 | 1140篇 |
2010年 | 685篇 |
2009年 | 564篇 |
2008年 | 917篇 |
2007年 | 872篇 |
2006年 | 916篇 |
2005年 | 944篇 |
2004年 | 896篇 |
2003年 | 811篇 |
2002年 | 770篇 |
2001年 | 539篇 |
2000年 | 423篇 |
1999年 | 383篇 |
1998年 | 149篇 |
1997年 | 154篇 |
1996年 | 119篇 |
1995年 | 126篇 |
1994年 | 90篇 |
1993年 | 78篇 |
1992年 | 179篇 |
1991年 | 167篇 |
1990年 | 180篇 |
1989年 | 174篇 |
1988年 | 152篇 |
1987年 | 147篇 |
1986年 | 119篇 |
1985年 | 100篇 |
1984年 | 73篇 |
1983年 | 68篇 |
1982年 | 42篇 |
1981年 | 75篇 |
1980年 | 52篇 |
1979年 | 59篇 |
1978年 | 56篇 |
1977年 | 53篇 |
1976年 | 45篇 |
1975年 | 39篇 |
1973年 | 40篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Michael A. Gibney David Fitz-Patrick David C. Klonoff Shahista Whooley Betty Lu Wen Yue 《Current medical research and opinion》2020,36(10):1591-1600
Abstract
Objective
Two similarly designed studies compared user experiences with a second-generation extra-thin-wall, 5-bevel 32?G?×?4?mm pen needle (PN) with redesigned hub versus four thinner commercially available PNs. 相似文献5.
Phytonutrients extracted from natural resources are receiving much attention among researchers due to their highly antioxidative characteristics which prevent several degenerative diseases including cardiovascular diseases and cancers. These nutraceutical compounds can be used in food, pharmaceutical and cosmetic products as natural antioxidants, preservatives, colourants and functional foods. Huge volume of food wastes are generated from the processing industry and these low-value food residues are rich in various phytonutrients worth recovering. This approach of valorisation reduces the generation of food wastes and is cost-effective considering the cheap feedstock, reduced waste management expenses and high market value of extracted compounds. In light of the health and safety risks posed by commonly used organic extraction solvents derived from the petrochemical industry, there is a need to recover the phytonutrients using green, sustainable and efficient solvents that are safe for human consumption. This work discusses ethyl lactate as a safe, green, efficient and potentially cheap solvent to recover phytonutrients from fruit and vegetable by-products. Ethyl lactate is compared with other organic solvents commonly used from the aspects of safety, environmental impacts and efficiency. Current challenges when employing ethyl lactate are also discussed. 相似文献
6.
7.
Will Kaufman Augustine S Chavez Betty Skipper Arthur Kaufman 《International journal for equity in health》2006,5(1):6-5
Background
A public hospital in New Mexico required collection of 50% of estimated costs prior to elective surgeries for self-pay patients. This study assesses the impact of this policy on access to elective surgical procedures. 相似文献8.
Chan C. H. Y Ng E. H. Y Chan C. L W 《世界核心医学期刊文摘》2006,2(6):15-15
目的:评价东部身体-智力-精神(EBMS)群体干预对进行体外受精(IVF)的中国妇女焦虑缓解的作用。设计:随机对照研究。机构:三级辅助生殖机构。受试者:227例接受第1个IVF周期治疗的妇女。干预:干预组(n=69)接受4次EBMS群体咨询,而对照组(n=115)无任何干预。主要观察指标:状态-特质焦虑问卷。结果:与对照组相比,干预组在干预后状态焦虑平均分显著下降。每组移植同样数目的卵子,但干预组没有明显更高妊娠率的倾向。 相似文献
9.
Teenage pregnancy is a well-documented problem in the United States, with approximately 890,000 teenage pregnancies occurring each year. Although teen pregnancy rates have declined since 1991, rates remain higher than the mid-1970s and are fourfold those of European countries. Substantial morbidity and social problems result from these pregnancies, affecting the mother, her children, other family members, and society. Multiple educational approaches have been used, with few demonstrating significant reductions in teen pregnancy. School-based programs have been diverse and multifaceted. Recently, programs with a comprehensive approach have shown potential for success. In this article, characteristics and elements of promising school-based programs are identified and discussed. It is imperative that school nurses play an active role in developing and implementing prevention programs that incorporate rigorous evaluation. As health educators, school nurses are in a prime position to implement and evaluate the effectiveness of teen pregnancy prevention programs. 相似文献
10.