全文获取类型
收费全文 | 11484篇 |
免费 | 1200篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 98篇 |
儿科学 | 346篇 |
妇产科学 | 183篇 |
基础医学 | 1689篇 |
口腔科学 | 357篇 |
临床医学 | 1275篇 |
内科学 | 2159篇 |
皮肤病学 | 243篇 |
神经病学 | 863篇 |
特种医学 | 399篇 |
外科学 | 1632篇 |
综合类 | 272篇 |
一般理论 | 8篇 |
预防医学 | 1152篇 |
眼科学 | 206篇 |
药学 | 712篇 |
中国医学 | 15篇 |
肿瘤学 | 1094篇 |
出版年
2022年 | 96篇 |
2021年 | 206篇 |
2020年 | 130篇 |
2019年 | 168篇 |
2018年 | 209篇 |
2017年 | 156篇 |
2016年 | 167篇 |
2015年 | 179篇 |
2014年 | 231篇 |
2013年 | 417篇 |
2012年 | 518篇 |
2011年 | 544篇 |
2010年 | 312篇 |
2009年 | 292篇 |
2008年 | 448篇 |
2007年 | 540篇 |
2006年 | 494篇 |
2005年 | 495篇 |
2004年 | 510篇 |
2003年 | 460篇 |
2002年 | 443篇 |
2001年 | 303篇 |
2000年 | 333篇 |
1999年 | 301篇 |
1998年 | 130篇 |
1997年 | 131篇 |
1996年 | 110篇 |
1995年 | 109篇 |
1994年 | 94篇 |
1993年 | 107篇 |
1992年 | 280篇 |
1991年 | 252篇 |
1990年 | 222篇 |
1989年 | 225篇 |
1988年 | 170篇 |
1987年 | 199篇 |
1986年 | 191篇 |
1985年 | 213篇 |
1984年 | 148篇 |
1983年 | 140篇 |
1982年 | 108篇 |
1981年 | 108篇 |
1980年 | 96篇 |
1979年 | 144篇 |
1978年 | 99篇 |
1977年 | 106篇 |
1976年 | 107篇 |
1973年 | 97篇 |
1972年 | 95篇 |
1971年 | 93篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Angela J. Jacques-Tiura Deborah A. Ellis April Idalski Carcone Sylvie Naar Kathryn Brogan Hartlieb Elizabeth K. Towner Thomas N. Templin K.-L. Catherine Jen 《The Journal of adolescent health》2019,64(3):355-361
Objective
Successful weight loss interventions for African-Americans adolescents are lacking. Cognitive-behavioral interventions seek to develop weight loss skills (e.g., counting calories, goal setting, managing one's environment). Little is known about how well adolescents implement such skills in their daily lives. Study aims were to (1) examine weight loss skills utilization at midpoint and end of a 6-month cognitive-behavioral/motivational interviewing weight loss sequential multiple assignment randomized trial (SMART), and (2) determine if greater skill utilization predicted weight loss at treatment end and 3 months post-treatment.Method
One hundred and eighty six African-Americans adolescents with obesity and their caregiver were first randomly assigned to complete 3 months of cognitive-behavioral and motivational interviewing family-based weight loss treatment in their home or in the research office (Phase 1). Nonresponders (i.e., those who lost < 3% of initial weight, n?=?161) were rerandomized to 3 months of continued skills training (n?=?83) or contingency management (n?=?78) for Phase 2; responders were allocated to 3 months of relapse prevention (n?=?20). Adolescents’ frequency of weight loss skills utilization was assessed via questionnaire at treatment midpoint and end.Results
Higher treatment attendance was associated with better skill utilization. Higher skill utilization was associated with more weight loss at treatment end, whereas higher baseline confidence was associated with more weight loss at follow-up.Conclusions
This study indicates the importance of attending weight loss intervention sessions to develop and strengthen weight loss skills in African-American adolescents with obesity, and strengthening confidence to use such skills for continued weight loss. 相似文献2.
3.
Alan. B. Franklin Sarah N. Bevins Jeremy W. Ellis Ryan S. Miller Susan A. Shriner J. Jeffrey Root Daniel P. Walsh Thomas J. Deliberto 《Transboundary and Emerging Diseases》2019,66(2):705-714
Using data on waterfowl band recoveries, we identified spatially explicit hotspots of concentrated waterfowl movement to predict occurrence and spatial spread of a novel influenza A virus (clade 2.3.4.4) introduced from Asia by waterfowl from an initial outbreak in North America in November 2014. In response to the outbreak, the hotspots of waterfowl movement were used to help guide sampling for clade 2.3.4.4 viruses in waterfowl as an early warning for the US poultry industry during the outbreak . After surveillance sampling of waterfowl, we tested whether there was greater detection of clade 2.3.4.4 viruses inside hotspots. We found that hotspots defined using kernel density estimates of waterfowl band recoveries worked well in predicting areas with higher prevalence of the viruses in waterfowl. This approach exemplifies the value of ecological knowledge in predicting risk to agricultural security. 相似文献
4.
5.
6.
7.
8.
9.
Mark S. Wallace Steven G. Charapata Robert Fisher Michael Byas‐Smith Peter S. Staats Martha Mayo Dawn McGuire David Ellis 《Neuromodulation》2006,9(2):75-86
Objective. The safety and efficacy of intrathecal (IT) ziconotide was studied in a randomized, double‐blind, placebo‐controlled trial. Materials and Methods. Patients (169 ziconotide, 86 placebo) with severe chronic nonmalignant pain unresponsive to conventional therapy and a visual analog scale of pain intensity (VASPI score) ≥ 50 mm were treated over a 6‐day period in an inpatient hospital setting. Initial starting dose was 0.4 µg/hour and was titrated to analgesia or intolerance (maximum dose 7.0 µg/hour). The starting and maximum doses were reduced to 0.1 µg/hour and 2.4 µg/hour, respectively, due to adverse events (AEs). Results. The mean percent reduction in VASPI score from baseline was 31.2% and 6.0% for ziconotide‐ and placebo‐treated patients, respectively (p ≤ 0.001). During the initial titration phase, a significantly greater percentage of patients in the ziconotide group compared to the placebo group reported AEs, including abnormal gait, amblyopia, dizziness, nausea, nystagmus, pain, urinary retention, and vomiting. Conclusion. Ziconotide provided significant analgesia in patients for whom conventional therapy failed. However, there was a considerable incidence of ziconotide‐associated AEs due to the rapid titration and high doses administered. 相似文献
10.