全文获取类型
收费全文 | 2005968篇 |
免费 | 154892篇 |
国内免费 | 3035篇 |
专业分类
耳鼻咽喉 | 27392篇 |
儿科学 | 66353篇 |
妇产科学 | 56603篇 |
基础医学 | 295076篇 |
口腔科学 | 58989篇 |
临床医学 | 176707篇 |
内科学 | 384878篇 |
皮肤病学 | 43642篇 |
神经病学 | 157501篇 |
特种医学 | 78964篇 |
外国民族医学 | 529篇 |
外科学 | 304365篇 |
综合类 | 46130篇 |
现状与发展 | 3篇 |
一般理论 | 647篇 |
预防医学 | 154957篇 |
眼科学 | 46392篇 |
药学 | 153055篇 |
3篇 | |
中国医学 | 3781篇 |
肿瘤学 | 107928篇 |
出版年
2018年 | 18445篇 |
2015年 | 18416篇 |
2014年 | 25360篇 |
2013年 | 38822篇 |
2012年 | 52431篇 |
2011年 | 56029篇 |
2010年 | 32923篇 |
2009年 | 31390篇 |
2008年 | 53677篇 |
2007年 | 56808篇 |
2006年 | 57794篇 |
2005年 | 55853篇 |
2004年 | 55138篇 |
2003年 | 52642篇 |
2002年 | 51705篇 |
2001年 | 93186篇 |
2000年 | 96584篇 |
1999年 | 81479篇 |
1998年 | 21921篇 |
1997年 | 19861篇 |
1996年 | 20052篇 |
1995年 | 19423篇 |
1994年 | 18262篇 |
1993年 | 17293篇 |
1992年 | 66959篇 |
1991年 | 66210篇 |
1990年 | 65144篇 |
1989年 | 62962篇 |
1988年 | 58485篇 |
1987年 | 57672篇 |
1986年 | 54760篇 |
1985年 | 52983篇 |
1984年 | 39476篇 |
1983年 | 33925篇 |
1982年 | 19616篇 |
1981年 | 17727篇 |
1980年 | 16642篇 |
1979年 | 37892篇 |
1978年 | 26546篇 |
1977年 | 22403篇 |
1976年 | 21262篇 |
1975年 | 22888篇 |
1974年 | 27817篇 |
1973年 | 26586篇 |
1972年 | 24719篇 |
1971年 | 23384篇 |
1970年 | 21538篇 |
1969年 | 20306篇 |
1968年 | 18709篇 |
1967年 | 16955篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Qian Zhang Larry D. Mesner Gina M. Calabrese Naomi Dirckx Zhu Li Angela Verardo Qian Yang Robert J. Tower Marie-Claude Faugere Charles R. Farber Thomas L. Clemens 《The Journal of clinical investigation》2021,131(7)
Bone mineral density (BMD) is a highly heritable predictor of osteoporotic fracture. GWAS have identified hundreds of loci influencing BMD, but few have been functionally analyzed. In this study, we show that SNPs within a BMD locus on chromosome 14q32.32 alter splicing and expression of PAR-1a/microtubule affinity regulating kinase 3 (MARK3), a conserved serine/threonine kinase known to regulate bioenergetics, cell division, and polarity. Mice lacking Mark3 either globally or selectively in osteoblasts have increased bone mass at maturity. RNA profiling from Mark3-deficient osteoblasts suggested changes in the expression of components of the Notch signaling pathway. Mark3-deficient osteoblasts exhibited greater matrix mineralization compared with controls that was accompanied by reduced Jag1/Hes1 expression and diminished downstream JNK signaling. Overexpression of Jag1 in Mark3-deficient osteoblasts both in vitro and in vivo normalized mineralization capacity and bone mass, respectively. Together, these findings reveal a mechanism whereby genetically regulated alterations in Mark3 expression perturb cell signaling in osteoblasts to influence bone mass. 相似文献
2.
3.
4.
5.
6.
7.
8.
Alexander E. J. Trevatt David R. Thomson Robert Miller Matthew Colquhoun Akinyemi I. Idowu Shakeel Rahman 《Journal of plastic surgery and hand surgery》2019,53(2):97-104
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia. 相似文献
9.
10.
Madan M. Rehani Emily R. Melick Raza M. Alvi Ruhani Doda Khera Salma Batool-Anwar Tomas G. Neilan Michael Bettmann 《European radiology》2020,30(4):1839-1846
To determine percent of patients without malignancy and ≤ 40 years of age with high cumulative radiation doses through recurrent CT exams and assess imaging appropriateness. From the cohort of patients who received cumulative effective dose (CED) of ≥ 100 mSv over a 5-year period, a sub-set was identified with non-malignant disease. The top 50 clinical indications leading to multiple CTs were determined. Clinical decision support (CDS) system scores were analyzed using a widely adopted standard of 1–3 (red) as “not usually appropriate,” 4–6 (yellow) “may or may not be appropriate,” and 7–9 (green) “usually appropriate.” Clinicians reviewed patient records to assess compliance with appropriate use criteria (AUC). 9.6% of patients in our series were with non-malignant conditions and 1.4% with age ≤ 40 years. CDS scores (rounded) were 2% red, 38% yellow, 27% green, and 33% unscored CTs. Clinical society guidelines for CT exams, wherever available, were followed in 87.5 to 100% of cases. AUCs were not available for several clinical indications as also referral guidelines for serial CT imaging. More than half of CT exams were unrelated to follow-up of a primary chronic disease. We are faced with a situation wherein patients in age ≤ 40 years require or are thought to require many CT exams over the course of a few years but the radiation risk creates concern. There is a fair number of conditions for which AUC are not available. Suggested solutions include development of CT scanners with lesser radiation dose and further development of appropriateness criteria. 相似文献