全文获取类型
收费全文 | 3163篇 |
免费 | 358篇 |
国内免费 | 85篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 35篇 |
妇产科学 | 36篇 |
基础医学 | 1082篇 |
口腔科学 | 34篇 |
临床医学 | 237篇 |
内科学 | 832篇 |
皮肤病学 | 22篇 |
神经病学 | 102篇 |
特种医学 | 59篇 |
外国民族医学 | 1篇 |
外科学 | 113篇 |
综合类 | 184篇 |
现状与发展 | 1篇 |
一般理论 | 1篇 |
预防医学 | 425篇 |
眼科学 | 26篇 |
药学 | 99篇 |
中国医学 | 94篇 |
肿瘤学 | 216篇 |
出版年
2024年 | 16篇 |
2023年 | 117篇 |
2022年 | 222篇 |
2021年 | 254篇 |
2020年 | 166篇 |
2019年 | 157篇 |
2018年 | 150篇 |
2017年 | 141篇 |
2016年 | 145篇 |
2015年 | 210篇 |
2014年 | 206篇 |
2013年 | 239篇 |
2012年 | 161篇 |
2011年 | 195篇 |
2010年 | 141篇 |
2009年 | 137篇 |
2008年 | 142篇 |
2007年 | 97篇 |
2006年 | 81篇 |
2005年 | 72篇 |
2004年 | 76篇 |
2003年 | 57篇 |
2002年 | 47篇 |
2001年 | 79篇 |
2000年 | 40篇 |
1999年 | 35篇 |
1998年 | 26篇 |
1997年 | 28篇 |
1996年 | 24篇 |
1995年 | 21篇 |
1994年 | 27篇 |
1993年 | 17篇 |
1992年 | 13篇 |
1991年 | 8篇 |
1990年 | 7篇 |
1989年 | 5篇 |
1988年 | 16篇 |
1987年 | 10篇 |
1986年 | 3篇 |
1985年 | 7篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有3606条查询结果,搜索用时 0 毫秒
51.
Laura R. Epstein Stella S. Lee Mayumi F. Miller Heather A. Lombardi 《Proceedings of the National Academy of Sciences of the United States of America》2021,118(22)
Technological advances, such as genome editing and specifically CRISPR, offer exciting promise for the creation of products that address public health concerns, such as disease transmission and a sustainable food supply and enable production of human therapeutics, such as organs and tissues for xenotransplantation or recombinant human proteins to treat disease. The Food and Drug Administration recognizes the need for such innovative solutions and plays a key role in bringing safe and effective animal biotechnology products to the marketplace. In this article, we (the Food and Drug Administration/Center for Veterinary Medicine) describe the current state of the science, including advances in technology as well as scientific limitations and considerations for how researchers and commercial developers working to create intentional genomic alterations in animals can work within these limitations. We also describe our risk-based approach and how it strikes a balance between our regulatory responsibilities and the need to get innovative products to market efficiently. We continue to seek input from our stakeholders and hope to use this feedback to improve the transparency, predictability, and efficiency of our process. We think that working together, using appropriate science- and risk-based oversight, is the foundation to a successful path forward. 相似文献
52.
Luhan Yang George Church Hong-Ye Zhao Lusheng Huang Yangbin Gao Hong-Jiang Wei Geoffrey Yang 《Proceedings of the National Academy of Sciences of the United States of America》2021,118(22)
Germline editing, the process by which the genome of an individual is edited in such a way that the change is heritable, has been applied to a wide variety of animals [D. A. Sorrell, A. F. Kolb, Biotechnol. Adv. 23, 431–469 (2005); D. Baltimore et al., Science 348, 36–38 (2015)]. Because of its relevancy in agricultural and biomedical research, the pig genome has been extensively modified using a multitude of technologies [K. Lee, K. Farrell, K. Uh, Reprod. Fertil. Dev. 32, 40–49 (2019); C. Proudfoot, S. Lillico, C. Tait-Burkard, Anim. Front. 9, 6–12 (2019)]. In this perspective, we will focus on using pigs as the model system to review the current methodologies, applications, and challenges of mammalian germline genome editing. We will also discuss the broad implications of animal germline editing and its clinical potential. 相似文献
53.
54.
Overcoming challenges to meaningful informed consent for whole genome sequencing in pediatric cancer research 下载免费PDF全文
55.
Ploidy manipulation and induction of alternate cleavage patterns through inhibition of centrosome duplication in the early zebrafish embryo 下载免费PDF全文
Results : A heat pulse at a later time point during the first cell cycle (22 mpf, HS2) results in a high (>80%) frequency of embryos exhibiting a precise one‐cell division stall during the second cell cycle, inducing whole genome duplication. Coupled with haploid production, HS2 generates viable gynogenetic diploids with yields up to 4 times higher than those achieved through standard Heat Shock. The cell cycle delay also causes blastomere cleavage pattern variations, supporting a role for cytokinesis in spindle orientation during the following cell cycle. 相似文献
56.
57.
Yen‐Tsung Huang Liming Liang Miriam F. Moffatt William O. C. M. Cookson Xihong Lin 《Genetic epidemiology》2015,39(5):347-356
Genome‐wide association studies (GWAS) have been a standard practice in identifying single nucleotide polymorphisms (SNPs) for disease susceptibility. We propose a new approach, termed integrative GWAS (iGWAS) that exploits the information of gene expressions to investigate the mechanisms of the association of SNPs with a disease phenotype, and to incorporate the family‐based design for genetic association studies. Specifically, the relations among SNPs, gene expression, and disease are modeled within the mediation analysis framework, which allows us to disentangle the genetic effect on a disease phenotype into two parts: an effect mediated through a gene expression (mediation effect, ME) and an effect through other biological mechanisms or environment‐mediated mechanisms (alternative effect, AE). We develop omnibus tests for the ME and AE that are robust to underlying true disease models. Numerical studies show that the iGWAS approach is able to facilitate discovering genetic association mechanisms, and outperforms the SNP‐only method for testing genetic associations. We conduct a family‐based iGWAS of childhood asthma that integrates genetic and genomic data. The iGWAS approach identifies six novel susceptibility genes (MANEA, MRPL53, LYCAT, ST8SIA4, NDFIP1, and PTCH1) using the omnibus test with false discovery rate less than 1%, whereas no gene using SNP‐only analyses survives with the same cut‐off. The iGWAS analyses further characterize that genetic effects of these genes are mostly mediated through their gene expressions. In summary, the iGWAS approach provides a new analytic framework to investigate the mechanism of genetic etiology, and identifies novel susceptibility genes of childhood asthma that were biologically meaningful. 相似文献
58.
Vision is the sense that we use to navigate the world around us. Thus it is not surprising that blindness is one of people's most feared maladies. Heritable diseases of the retina, such as age-related macular degeneration and retinitis pigmentosa, are the leading cause of blindness in the developed world, collectively affecting as many as one-third of all people over the age of 75, to some degree. For decades, scientists have dreamed of preventing vision loss or of restoring the vision of patients affected with retinal degeneration through drug therapy, gene augmentation or a cell-based transplantation approach. In this review we will discuss the use of the induced pluripotent stem cell technology to model and develop various treatment modalities for the treatment of inherited retinal degenerative disease. We will focus on the use of iPSCs for interrogation of disease pathophysiology, analysis of drug and gene therapeutics and as a source of autologous cells for cell transplantation and replacement. 相似文献
59.
Kira E.F. Ramdas Konstantin P. Lyashchenko Rena Greenwald Suelee Robbe-Austerman Cynthia McManis W. Ray Waters 《Emerging infectious diseases》2015,21(3):480-483
Mycobacterium bovis infection of cats is exceedingly rare in regions where bovine tuberculosis is not endemic. We describe the diagnosis and clinical management of pulmonary M. bovis infection in 2 indoor-housed cats and their association with at least 1 M. bovis–infected human in Texas, USA, in September 2012. 相似文献
60.
Susanna K.P. Lau Alan K.L. Wu Jade L.L. Teng Herman Tse Shirly O.T. Curreem Stephen K.W. Tsui Yi Huang Jonathan H.K. Chen Rodney A. Lee Kwok-Yung Yuen Patrick C.Y. Woo 《Emerging infectious diseases》2015,21(2):232-241
Elizabethkingia anophelis, recently discovered from mosquito gut, is an emerging bacterium associated with neonatal meningitis and nosocomial outbreaks. However, its transmission route remains unknown. We use rapid genome sequencing to investigate 3 cases of E. anophelis sepsis involving 2 neonates who had meningitis and 1 neonate’s mother who had chorioamnionitis. Comparative genomics revealed evidence for perinatal vertical transmission from a mother to her neonate; the 2 isolates from these patients, HKU37 and HKU38, shared essentially identical genome sequences. In contrast, the strain from another neonate (HKU36) was genetically divergent, showing only 78.6% genome sequence identity to HKU37 and HKU38, thus excluding a clonal outbreak. Comparison to genomes from mosquito strains revealed potential metabolic adaptations in E. anophelis under different environments. Maternal infection, not mosquitoes, is most likely the source of neonatal E. anophelis infections. Our findings highlight the power of genome sequencing in gaining rapid insights on transmission and pathogenesis of emerging pathogens. 相似文献