全文获取类型
收费全文 | 228570篇 |
免费 | 14287篇 |
国内免费 | 640篇 |
专业分类
耳鼻咽喉 | 2915篇 |
儿科学 | 6987篇 |
妇产科学 | 4651篇 |
基础医学 | 30541篇 |
口腔科学 | 8590篇 |
临床医学 | 18056篇 |
内科学 | 50103篇 |
皮肤病学 | 5097篇 |
神经病学 | 19850篇 |
特种医学 | 7216篇 |
外国民族医学 | 30篇 |
外科学 | 30795篇 |
综合类 | 2203篇 |
现状与发展 | 2篇 |
一般理论 | 129篇 |
预防医学 | 22962篇 |
眼科学 | 4441篇 |
药学 | 13984篇 |
中国医学 | 765篇 |
肿瘤学 | 14180篇 |
出版年
2023年 | 1102篇 |
2022年 | 2361篇 |
2021年 | 4621篇 |
2020年 | 3002篇 |
2019年 | 4365篇 |
2018年 | 5991篇 |
2017年 | 4407篇 |
2016年 | 4261篇 |
2015年 | 4950篇 |
2014年 | 7053篇 |
2013年 | 9309篇 |
2012年 | 14265篇 |
2011年 | 15055篇 |
2010年 | 7806篇 |
2009年 | 7094篇 |
2008年 | 12159篇 |
2007年 | 12924篇 |
2006年 | 12234篇 |
2005年 | 12574篇 |
2004年 | 12005篇 |
2003年 | 10966篇 |
2002年 | 8959篇 |
2001年 | 5468篇 |
2000年 | 5363篇 |
1999年 | 4954篇 |
1998年 | 2299篇 |
1997年 | 1926篇 |
1996年 | 1843篇 |
1995年 | 1625篇 |
1994年 | 1563篇 |
1993年 | 1421篇 |
1992年 | 3041篇 |
1991年 | 2961篇 |
1990年 | 2656篇 |
1989年 | 2650篇 |
1988年 | 2405篇 |
1987年 | 2237篇 |
1986年 | 2084篇 |
1985年 | 2057篇 |
1984年 | 1731篇 |
1983年 | 1420篇 |
1982年 | 1091篇 |
1981年 | 1026篇 |
1980年 | 995篇 |
1979年 | 1181篇 |
1978年 | 906篇 |
1977年 | 773篇 |
1975年 | 767篇 |
1974年 | 794篇 |
1973年 | 725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.
Selwyn Arlington Headley Nayara Emily Viana Mariana de Mello Zanim Michelazzo Ana Aparecida Correa Xavier Cícero Júlio Silva Costa Felipe Hideki Ogo de Pinho Marcelo Diniz dos Santos 《Transboundary and Emerging Diseases》2020,67(Z2):49-59
Neorickettsia helminthoeca (NH), the agent of salmon poisoning disease or canine neorickettiosis (CN), is a bacterial endosymbiont of the nematode Nanophyetus salmincola, and infections are spreading among specific fish‐eating mammalians. This article describes the pathologic and immunohistochemical findings associated with spontaneous NH‐induced infections in dogs from Southern Brazil. The principal pathologic findings were hypertrophy of Peyer patches and lymphadenopathy with lymphocytic proliferation, chronic interstitial pneumonia, and chronic enteritis associated with positive intralesional immunoreactivity to antigens of NH within macrophages and histiocytes. Positive immunoreactivity against canine parvovirus‐2 (CPV‐2) or/and canine distemper virus was not detected in the evaluated intestinal segments or in the samples from the cerebellum and lungs, respectively, from the dogs evaluated. These findings demonstrated that NH was involved in the enteric, pulmonary, and lymphoid lesions herein described, and provide additional information to confirm the occurrence of this bacterial endosymbiont within this geographical location. It is proposed that chronic pneumonia should be considered as a pathologic manifestation of NH‐induced infections. Additionally, our results show that the occurrences of CN seem to be underdiagnosed in Southern Brazil due to the confusion with the incidence of CPV‐2. 相似文献
7.
8.
9.
Lara Silveira Abdo Aguiar Rita de Cssia Rossini Lismary Aparecida de Forville Mesquita Gerson Dellatorre 《Journal of Cosmetic Dermatology》2019,18(6):1733-1736
Depigmented lesions may occur as postinflammatory sequelae of subacute cutaneous lupus erythematosus (SCLE), leading to great psychosocial impact. A 53‐year‐old male patient presented with post‐SCLE depigmented facial lesions after five years of disease stability. We proposed surgical treatment with melanocyte‐keratinocyte transplantation procedure (MKTP), and after five months the patient achieved 90% repigmentation, without Koebner phenomenon (KP). In theory, KP is a possible complication of MKTP procedure since the preparation of the receptor area involves the use of dermabrasion. In an attempt to avoid it, we suggest to maintain the treatment of the underlying disease and wait for a minimum period of disease stability before the procedure. 相似文献