全文获取类型
收费全文 | 2883276篇 |
免费 | 217542篇 |
国内免费 | 5437篇 |
专业分类
耳鼻咽喉 | 38832篇 |
儿科学 | 95055篇 |
妇产科学 | 79959篇 |
基础医学 | 409144篇 |
口腔科学 | 85613篇 |
临床医学 | 258654篇 |
内科学 | 557196篇 |
皮肤病学 | 63661篇 |
神经病学 | 228438篇 |
特种医学 | 111927篇 |
外国民族医学 | 698篇 |
外科学 | 436915篇 |
综合类 | 70040篇 |
现状与发展 | 6篇 |
一般理论 | 1010篇 |
预防医学 | 220021篇 |
眼科学 | 68219篇 |
药学 | 214651篇 |
9篇 | |
中国医学 | 6363篇 |
肿瘤学 | 159844篇 |
出版年
2018年 | 30238篇 |
2017年 | 23291篇 |
2016年 | 25696篇 |
2015年 | 29431篇 |
2014年 | 40860篇 |
2013年 | 60996篇 |
2012年 | 83648篇 |
2011年 | 88185篇 |
2010年 | 52254篇 |
2009年 | 49141篇 |
2008年 | 82979篇 |
2007年 | 87950篇 |
2006年 | 88848篇 |
2005年 | 85607篇 |
2004年 | 83540篇 |
2003年 | 79775篇 |
2002年 | 77415篇 |
2001年 | 140781篇 |
2000年 | 144837篇 |
1999年 | 121238篇 |
1998年 | 32797篇 |
1997年 | 29207篇 |
1996年 | 29152篇 |
1995年 | 28149篇 |
1994年 | 26200篇 |
1993年 | 24377篇 |
1992年 | 96071篇 |
1991年 | 93325篇 |
1990年 | 90482篇 |
1989年 | 87281篇 |
1988年 | 80413篇 |
1987年 | 78833篇 |
1986年 | 74910篇 |
1985年 | 71888篇 |
1984年 | 53274篇 |
1983年 | 45753篇 |
1982年 | 26353篇 |
1981年 | 23577篇 |
1979年 | 49371篇 |
1978年 | 34044篇 |
1977年 | 28940篇 |
1976年 | 27159篇 |
1975年 | 28756篇 |
1974年 | 35076篇 |
1973年 | 33714篇 |
1972年 | 31139篇 |
1971年 | 29217篇 |
1970年 | 27013篇 |
1969年 | 25303篇 |
1968年 | 23303篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Kinase alterations are increasingly recognised as oncogenic drivers in mesenchymal tumours. Infantile fibrosarcoma and the related renal tumour, congenital mesoblastic nephroma, were among the first solid tumours shown to harbour recurrent tyrosine kinase fusions, with the canonical ETV6::NTRK3 fusion identified more than 20 years ago. Although targeted testing has long been used in diagnosis, the advent of more robust sequencing techniques has driven the discovery of kinase alterations in an array of mesenchymal tumours. As our ability to identify these genetic alterations has improved, as has our recognition and understanding of the tumours that harbour these alterations. Specifically, this study will focus upon mesenchymal tumours harbouring NTRK or other kinase alterations, including tumours with an infantile fibrosarcoma-like appearance, spindle cell tumours resembling lipofibromatosis or peripheral nerve sheath tumours and those occurring in adults with a fibrosarcoma-like appearance. As publications describing the histology of these tumours increase so, too, do the variety kinase alterations reported, now including NTRK1/2/3, RET, MET, RAF1, BRAF, ALK, EGFR and ABL1 fusions or alterations. To date, these tumours appear locally aggressive and rarely metastatic, without a clear link between traditional features used in histological grading (e.g. mitotic activity, necrosis) and outcome. However, most of these tumours are amenable to new targeted therapies, making their recognition of both diagnostic and therapeutic import. The goal of this study is to review the clinicopathological features of tumours with NTRK and other tyrosine kinase alterations, discuss the most common differential diagnoses and provide recommendations for molecular confirmation with associated treatment implications. 相似文献
2.
Molnár B. Aroca S. Dobos A. Orbán K. Szabó J. Windisch P. Stähli A. Sculean A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with... 相似文献
3.
4.
Kienbaum Peter Schaefer Maximilian S. Weibel Stephanie Schlesinger Tobias Meybohm Patrick Eberhart Leopold H. Kranke Peter 《Der Anaesthesist》2022,71(2):123-128
Die Anaesthesiologie - Auch wenn für Anästhesiologen über Jahrzehnte die Prophylaxe und Therapie postoperativer Schmerzen im Rahmen des postoperativen Patientenkomforts an vorderster... 相似文献
5.
6.
7.
8.
Karl Johnson Katherine W. Saylor Isabella Guynn Karen Hicklin Jonathan S. Berg Kristen Hassmiller Lich 《Genetics in medicine》2022,24(2):262-288
PurposeUnderstanding the value of genetic screening and testing for monogenic disorders requires high-quality, methodologically robust economic evaluations. This systematic review sought to assess the methodological quality among such studies and examined opportunities for improvement.MethodsWe searched PubMed, Cochrane, Embase, and Web of Science for economic evaluations of genetic screening/testing (2013-2019). Methodological rigor and adherence to best practices were systematically assessed using the British Medical Journal checklist.ResultsAcross the 47 identified studies, there were substantial variations in modeling approaches, reporting detail, and sophistication. Models ranged from simple decision trees to individual-level microsimulations that compared between 2 and >20 alternative interventions. Many studies failed to report sufficient detail to enable replication or did not justify modeling assumptions, especially for costing methods and utility values. Meta-analyses, systematic reviews, or calibration were rarely used to derive parameter estimates. Nearly all studies conducted some sensitivity analysis, and more sophisticated studies implemented probabilistic sensitivity/uncertainty analysis, threshold analysis, and value of information analysis.ConclusionWe describe a heterogeneous body of work and present recommendations and exemplar studies across the methodological domains of (1) perspective, scope, and parameter selection; (2) use of uncertainty/sensitivity analyses; and (3) reporting transparency for improvement in the economic evaluation of genetic screening/testing. 相似文献
9.
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