全文获取类型
收费全文 | 10571篇 |
免费 | 657篇 |
国内免费 | 18篇 |
专业分类
耳鼻咽喉 | 62篇 |
儿科学 | 412篇 |
妇产科学 | 370篇 |
基础医学 | 1349篇 |
口腔科学 | 83篇 |
临床医学 | 1292篇 |
内科学 | 1844篇 |
皮肤病学 | 204篇 |
神经病学 | 1006篇 |
特种医学 | 230篇 |
外科学 | 1269篇 |
综合类 | 75篇 |
一般理论 | 6篇 |
预防医学 | 1268篇 |
眼科学 | 169篇 |
药学 | 793篇 |
中国医学 | 4篇 |
肿瘤学 | 810篇 |
出版年
2024年 | 12篇 |
2023年 | 100篇 |
2022年 | 169篇 |
2021年 | 328篇 |
2020年 | 173篇 |
2019年 | 323篇 |
2018年 | 377篇 |
2017年 | 267篇 |
2016年 | 299篇 |
2015年 | 282篇 |
2014年 | 411篇 |
2013年 | 636篇 |
2012年 | 1003篇 |
2011年 | 944篇 |
2010年 | 486篇 |
2009年 | 429篇 |
2008年 | 770篇 |
2007年 | 775篇 |
2006年 | 657篇 |
2005年 | 641篇 |
2004年 | 625篇 |
2003年 | 509篇 |
2002年 | 449篇 |
2001年 | 63篇 |
2000年 | 51篇 |
1999年 | 57篇 |
1998年 | 71篇 |
1997年 | 62篇 |
1996年 | 43篇 |
1995年 | 24篇 |
1994年 | 40篇 |
1993年 | 27篇 |
1992年 | 19篇 |
1991年 | 18篇 |
1990年 | 16篇 |
1989年 | 12篇 |
1988年 | 10篇 |
1987年 | 9篇 |
1986年 | 9篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 12篇 |
1982年 | 6篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1972年 | 2篇 |
1910年 | 1篇 |
1909年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Diana H. Yu BA ; Kimberly A. Mace PhD ; Scott L. Hansen MD ; Nancy Boudreau PhD ; David M. Young MD 《Wound repair and regeneration》2007,15(5):628-635
Insulin-like growth factor-1 (Igf-1), a critical mediator of tissue repair, is significantly decreased in diabetic wounds. Furthermore, decreased levels of hypoxia-inducible factor 1-alpha (Hif-1alpha) and its target genes are also associated with impaired wound healing in diabetic mice. The aim of our study was to examine whether the reduced levels of Igf-1 are responsible for the reduction in Hif-1alpha protein synthesis and activity in diabetic wounds. We provide evidence that Igf-1 regulates Hif-1alpha protein synthesis and activity during wound repair. In addition, Igf-1 stimulated phosphytidylinositol 3-kinase activity in diabetic fibroblasts, which, in turn, increased activation of the translational regulatory protein, p70 S6 kinase. Moreover, improved healing of diabetic wounds by addition of recombinant IGF-1 protein was associated with an increase in Hif-1alpha protein synthesis and function in vivo. 相似文献
992.
McKevitt Elaine Cheifetz Rona DeVries Kimberly Laws Alison Warburton Rebecca Gondara Lovedeep Lohrisch Caroline Nichol Alan 《Annals of surgical oncology》2021,28(11):5950-5957
Annals of Surgical Oncology - The SSO Choosing Wisely campaign recommended selective sentinel lymph node biopsy (SLNB) in clinically node-negative women aged ≥ 70 years with ER+ breast... 相似文献
993.
994.
995.
996.
997.
Laura M. Bogart Marc N. Elliott Kimberly Uyeda Jennifer Hawes-Dawson David J. Klein Mark A. Schuster 《The Journal of adolescent health》2011,48(2):196-202
PurposeWe used principles of community-based participatory research to develop and pilot test a 5-week intervention for middle school students, Students for Nutrition and eXercise (SNaX). SNaX aimed to translate school obesity-prevention policies into practice with peer advocacy of healthy eating and school cafeteria changes.MethodsA total 425 seventh graders (63% of all seventh graders) in the intervention school were surveyed at baseline regarding cafeteria attitudes and sugar-sweetened beverage consumption; of the 425 students, 399 (94%) were surveyed again at 1-month post-intervention. School cafeteria records were obtained from two schools: the intervention school and a nonrandomized selected comparison school with similar student socio-demographic characteristics.ResultsA total of 140 students in the intervention school were trained as peer advocates. In the intervention school, cafeteria attitudes among peer advocates significantly improved over time (approximately one-third of a standard deviation), whereas cafeteria attitudes of non-peer advocates remained stable; the improvement among peer advocates was significantly greater than the pre-post-change for non-peer advocates (b = .71, p < .001). Peer advocates significantly reduced their sugar-sweetened beverage intake (sports and fruit drinks), from 33% before intervention to 21% after intervention (p = .03). Cafeteria records indicated that servings of fruit and healthier entrées (salads, sandwiches, and yogurt parfaits) significantly decreased in the comparison school and significantly increased in the intervention school; the magnitude of changes differed significantly between the schools (p < .001).ConclusionsAs compared with the non-peer advocates, peer advocates appeared to benefit more from the intervention. Future research should consider engaging parents, students, and other key community stakeholders to determine acceptable and sustainable cafeteria changes. 相似文献
998.
David A. Siegel Hannah E. Reses Andrea J. Cool Craig N. Shapiro Joy Hsu Tegan K. Boehmer Cheryl R. Cornwell Elizabeth B. Gray S. Jane Henley Kimberly Lochner Amitabh B. Suthar B. Casey Lyons Linda Mattocks Kathleen Hartnett Jennifer Adjemian Katharina L. van Santen Michael Sheppard Karl A. Soetebier MAPW Pamela Logan Michael Martin Osatohamwen Idubor Pavithra Natarajan Kanta Sircar Eghosa Oyegun Joyce Dalton Cria G. Perrine Georgina Peacock Beth Schweitzer Sapna Bamrah Morris Elliot Raizes 《MMWR. Morbidity and mortality weekly report》2021,70(36):1249
999.
Levy V Prentiss D Balmas G Chen S Israelski D Katzenstein D Page-Shafer K 《Journal of immigrant and minority health / Center for Minority Public Health》2007,9(1):49-54
To describe the determinants of delayed HIV presentation in one Northern California County, the authors identify persons with an opportunistic infection (OI) at HIV diagnosis. From 2000–2002, a sample of HIV patients attending a public AIDS program (n=391) were identified. Immigrants composed 24% of our sample; 78.7% of immigrants were Hispanic. Immigrants, compared to U.S.-born patients, presented with lower initial CD4+ counts at diagnosis than U.S.-born patients (287 cells/mm3 vs. 333 cells/mm3, p=0.143), were more likely to have an OI at HIV diagnosis (29.8% vs. 17.2%, p=0.009), and were more likely to be hospitalized at HIV diagnosis (20.2% vs. 12.5%, p=0.064). We found only immigrant status was significantly and independently associated with delayed presentation. Interviews with 20 newly HIV diagnosed Hispanic patients suggest lack of knowledge regarding HIV risk, social stigma, secrecy and symptom driven health seeking behavior all contribute to delayed clinical presentation. The main precipitants of HIV testing for immigrants were HIV/AIDS related symptoms and sexually transmitted infection (STI)/HIV diagnosis in a sexual partner. These results support augmentation of STI/HIV voluntary clinical testing and partner notification services along the Mexico-California migrant corridor. 相似文献
1000.
BACKGROUND: Umbilical endometriosis is rare and can be a challenging diagnosis in the absence of classic signs and symptoms. CASE: A case of severe, primary, spontaneous umbilical endometriosis with foci of plasma cell endometritis and diffuse stromal lymphovascular presence occurred. CONCLUSION: Despite a lengthy differential, endometriosis must be considered in the evaluation of an umbilical mass. The presence of plasma cell endometritis and stromal lymphovascular elements in the absence of pelvic endometriosis lends evidence to the theory of lymphovascular transport as an etiology of extrapelvic endometriosis. 相似文献