全文获取类型
收费全文 | 181556篇 |
免费 | 1283篇 |
国内免费 | 29篇 |
专业分类
耳鼻咽喉 | 1222篇 |
儿科学 | 6780篇 |
妇产科学 | 3107篇 |
基础医学 | 17429篇 |
口腔科学 | 1675篇 |
临床医学 | 12837篇 |
内科学 | 32374篇 |
皮肤病学 | 802篇 |
神经病学 | 17155篇 |
特种医学 | 9016篇 |
外科学 | 29758篇 |
综合类 | 2329篇 |
预防医学 | 18371篇 |
眼科学 | 2774篇 |
药学 | 9783篇 |
中国医学 | 628篇 |
肿瘤学 | 16828篇 |
出版年
2023年 | 53篇 |
2022年 | 40篇 |
2021年 | 225篇 |
2020年 | 139篇 |
2019年 | 233篇 |
2018年 | 22127篇 |
2017年 | 17521篇 |
2016年 | 19626篇 |
2015年 | 1090篇 |
2014年 | 1052篇 |
2013年 | 1026篇 |
2012年 | 7438篇 |
2011年 | 21456篇 |
2010年 | 19065篇 |
2009年 | 11722篇 |
2008年 | 19827篇 |
2007年 | 22029篇 |
2006年 | 901篇 |
2005年 | 2472篇 |
2004年 | 3672篇 |
2003年 | 4615篇 |
2002年 | 2726篇 |
2001年 | 373篇 |
2000年 | 537篇 |
1999年 | 301篇 |
1998年 | 242篇 |
1997年 | 232篇 |
1996年 | 126篇 |
1995年 | 142篇 |
1994年 | 125篇 |
1993年 | 85篇 |
1992年 | 96篇 |
1991年 | 148篇 |
1990年 | 176篇 |
1989年 | 122篇 |
1988年 | 103篇 |
1987年 | 85篇 |
1986年 | 63篇 |
1985年 | 48篇 |
1984年 | 50篇 |
1983年 | 46篇 |
1982年 | 36篇 |
1980年 | 53篇 |
1978年 | 31篇 |
1974年 | 33篇 |
1969年 | 29篇 |
1938年 | 60篇 |
1934年 | 30篇 |
1932年 | 56篇 |
1930年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
J. Nicholas Dionne-Odom PhD RN Andres Azuero PhD MBA Richard A. Taylor DNP CRNP APN-BC Chinara Dosse MAEd Avery C. Bechthold BSN RN Erin Currie PhD RN Rhiannon D. Reed DrPH Erin R. Harrell PhD Sally Engler MPH Deborah B. Ejem PhD Nataliya V. Ivankova PhD MPH Michelle Y. Martin PhD Gabrielle B. Rocque MD MSPH Grant R. Williams MD MSPH Marie A. Bakitas DNSc NP-C 《Cancer》2022,128(6):1321-1330
3.
Eskelinen Tommi Veitonmäki Thea Kotsar Andres Tammela Teuvo L. J. Pöyhönen Antti Murtola Teemu J. 《Cancer causes & control : CCC》2022,33(2):313-320
Cancer Causes & Control - We explored renal cell cancer (RCC) survival among users of antihypertensive medication as hypertension is proposed to be a risk factor for RCC and ACE-inhibitors and... 相似文献
4.
Fulvia Milena Cribi Roberta Erra Lorenza Pugni Carlota Rubio-Perez Lidia Alonso Sara Simonetti Giorgio Alberto Croci Garazi Serna Andrea Ronchi Carlo Pietrasanta Giovanna Lunghi Anna Maria Fagnani Maria Piana Matthias Matter Alexandar Tzankov Luigi Terracciano Andres Anton Enrico Ferrazzi Stefano Ferrero Enrico Iurlaro Joan Seoane Paolo Nuciforo 《The Journal of clinical investigation》2021,131(6)
5.
Mutations in leucine rich repeat kinase 2 (LRRK2) are a major cause of familial Parkinson's disease (PD) and a risk factor for its sporadic form. LRRK2 hyperactivity has also been reported in sporadic PD, making LRRK2 an appealing target for PD small-molecule therapeutics. At a cellular level, increasing evidence suggests that LRRK2 regulates membrane trafficking. Under some conditions LRRK2 also associates with microtubules, the cellular tracks used by dynein and kinesin motors to move membranes. At a structural level, however, relatively little was known about LRRK2. An important step toward bridging this gap took place last year with the publication of structures of LRRK2's cytosolic and microtubule-bound forms. Here, we review the main findings from these studies and discuss what we see as the major challenges going forward with a focus on areas that will require structural information. We also introduce the structural techniques—cryo-electron microscopy and cryo-electron tomography—that were instrumental to solving the structures of LRRK2. © 2021 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society 相似文献
6.
7.
Javier Barber-Milln Carolina Larrazbal-Morn Juan Jos Enciso-Ripoll Esteban Prez-Pevida David Chvarri-Prado María Dolores Gmez-Adrin 《Medicina oral, patología oral y cirugía bucal》2021,26(3):e361
Background Primary stability is an important key determinant of implant osseointegration. We investigated approaches to improve primary implant stability using a new drilling technique termed osseodensification (OD), which was compared with the conventional under-drilling (UD) method utilized for low-density bones. Material and Methods We placed 55 conical internal connection implants in each group, in 30 low-density sections of pig tibia. The implants were placed using twist drill bits in both groups; groups Under Drilling (UD) and Osseodensification (OD) included bone sections subjected to conventional UD and OD drilling, respectively. Before placing the implants, we randomized the bone sections that were to receive these implants to avoid sample bias. We evaluated various primary stability parameters, such as implant insertion torque and resonance frequency analysis (RFA) measurements. Results The results showed that compared with implants placed using the UD technique, those placed using the OD technique were associated with significantly higher primary stability. The mean insertion torque of the implants was 8.87±6.17 Ncm in group 1 (UD) and 21.72±17.14 Ncm in group 2 (OD). The mean RFA was 65.16±7.45 ISQ in group 1 (UD) and 69.75±6.79 ISQ in group 2 (OD). Conclusions The implant insertion torque and RFA values were significantly higher in OD group than in UD. Therefore, compared with UD, OD improves primary stability in low-density bones (based on torque and RFA measurements). Key words:Osseodensification, primary stability, low density bone, RFA. 相似文献
8.
R. García-Ramos D. Santos-García A. Alonso-Cánovas M. Álvarez-Sauco B. Ares A. Ávila N. Caballol F. Carrillo F. Escamilla Sevilla E. Freire J.C. Gómez Esteban I. Legarda L. López Manzanares E. López Valdés I. Martínez-Torres M. Mata I. Pareés B. Pascual-Sedano J.C. Martínez Castrillo 《Neurología (Barcelona, Spain)》2021,36(2):149-158
IntroductionThe main challenge of Parkinson's disease in women of childbearing age is managing symptoms and drugs during pregnancy and breastfeeding. The increase in the age at which women are having children makes it likely that these pregnancies will become more common in future.ObjectivesThis study aims to define the clinical characteristics of women of childbearing age with Parkinson's disease and the factors affecting their lives, and to establish a series of guidelines for managing pregnancy in these patients.ResultsThis consensus document was developed through an exhaustive literature search and a discussion of the available evidence by a group of movement disorder experts from the Spanish Society of Neurology.ConclusionsParkinson's disease affects all aspects of sexual and reproductive health in women of childbearing age. Pregnancy should be well planned to minimise teratogenic risk. A multidisciplinary approach should be adopted in the management of these patients in order to take all relevant considerations into account. 相似文献
9.
Sandra Rincon Lina P. Carvajal Sara I. Gomez-Villegas Aura M. Echeverri Rafael Rios An Dinh Claudia Pedroza Karen M. Ordoez Esteban Nannini Zhizeng Sun Vance G. Fowler Barbara E. Murray William R. Miller Timothy Palzkill Lorena Diaz Cesar A. Arias Jinnethe Reyes 《Journal of clinical microbiology》2021,59(4)
10.