全文获取类型
收费全文 | 685篇 |
免费 | 36篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 26篇 |
妇产科学 | 9篇 |
基础医学 | 77篇 |
口腔科学 | 30篇 |
临床医学 | 49篇 |
内科学 | 125篇 |
皮肤病学 | 38篇 |
神经病学 | 14篇 |
特种医学 | 109篇 |
外科学 | 87篇 |
综合类 | 49篇 |
预防医学 | 33篇 |
眼科学 | 9篇 |
药学 | 59篇 |
肿瘤学 | 25篇 |
出版年
2023年 | 2篇 |
2022年 | 8篇 |
2021年 | 6篇 |
2020年 | 5篇 |
2019年 | 7篇 |
2018年 | 14篇 |
2017年 | 12篇 |
2016年 | 7篇 |
2015年 | 13篇 |
2014年 | 10篇 |
2013年 | 20篇 |
2012年 | 14篇 |
2011年 | 27篇 |
2010年 | 26篇 |
2009年 | 29篇 |
2008年 | 12篇 |
2007年 | 35篇 |
2006年 | 37篇 |
2005年 | 14篇 |
2004年 | 34篇 |
2003年 | 20篇 |
2002年 | 18篇 |
2001年 | 22篇 |
2000年 | 16篇 |
1999年 | 11篇 |
1998年 | 29篇 |
1997年 | 31篇 |
1996年 | 38篇 |
1995年 | 21篇 |
1994年 | 13篇 |
1993年 | 21篇 |
1992年 | 14篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 24篇 |
1988年 | 10篇 |
1987年 | 15篇 |
1986年 | 10篇 |
1985年 | 12篇 |
1984年 | 9篇 |
1983年 | 8篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1980年 | 12篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 7篇 |
1976年 | 5篇 |
1975年 | 5篇 |
1967年 | 2篇 |
排序方式: 共有742条查询结果,搜索用时 15 毫秒
1.
Coronary artery bypass grafts: visualization with MR imaging 总被引:1,自引:0,他引:1
2.
3.
4.
5.
Genotype-phenotype correlation for nucleotide substitutions in the IgII- IgIII linker of FGFR2 总被引:6,自引:3,他引:3
6.
The guanylnucleotide specificity of muscarinic acetylcholine receptor (MR) inhibitory coupling to cardiac adenylate cyclase (AC) was investigated under low MgCl2 (i.e., 0.5 mM) conditions. In purified cardiac sarcolemma, carbachol maximally inhibited AC activity 60% in the presence of GTP. Carbachol-dependent inhibition in the presence of guanosine 5'-O-(3-thiotriphosphate (GTP gamma S) or guanylylimidodiphosphate [Gpp(NH)p] was of lesser magnitude (i.e., 30%) and was evident only during short incubation periods. Of greater interest, carbachol maximally inhibited AC activity in the presence of GDP and guanosine 5'-O-(2-thiodiphosphate (GDP beta S) by 35 and 60%, respectively. Control studies ruled out transphosphorylation of GDP and GDP beta S by nucleoside diphosphate kinase or guanylnucleoside triphosphate contamination as reasons for the inhibitory effects of GDP and GDP beta S. Furthermore, isoproterenol stimulated AC in the presence of GTP, GTP gamma S, and Gpp(NH)p but not in the presence of GDP or GDP beta S. Therefore, GDP and GDP beta S may serve as agonists on MR-activated Gi but not on beta-adrenergic receptor-activated Gs in these membranes. Time course studies revealed that carbachol-dependent inhibition of AC in the presence of either GTP or GDP occurred without a detectable lag period, and this inhibition was rapidly reversed by atropine. In contrast, a 1-2-min lag time was required for carbachol- and GDP beta S-dependent inhibition of AC to occur, and inhibition, once developed, was only partially and slowly reversed by atropine. Preincubation of sarcolemma with carbachol and GDP beta S, in the absence of ATP or under nonphosphorylating conditions, eliminated the lag time for inhibition of AC activity. Although it is unlikely that GDP and GDP beta S have physiological relevance of MR-Gi-AC coupling, these studies provide unique insights into this coupling mechanism in cardiac membranes. 相似文献
7.
8.
9.
Localization of a gene for otosclerosis to chromosome 15q25-q26 总被引:5,自引:0,他引:5
Tomek MS; Brown MR; Mani SR; Ramesh A; Srisailapathy CR; Coucke P; Zbar RI; Bell AM; McGuirt WT; Fukushima K; Willems PJ; Van Camp G; Smith RJ 《Human molecular genetics》1998,7(2):285-290
Among white adults otosclerosis is the single most common cause of hearing
impairment. Although the genetics of this disease are controversial, the
majority of studies indicate autosomal dominant inheritance with reduced
penetrance. We studied a large multi- generational family in which
otosclerosis has been inherited in an autosomal dominant pattern. Five of16
affected persons have surgically confirmed otosclerosis; the remaining nine
have a conductive hearing loss but have not undergone corrective surgery.
To locate the disease- causing gene we completed genetic linkage analysis
using short tandem repeat polymorphisms (STRPs) distributed over the entire
genome. Multipoint linkage analysis showed that only one genomic region, on
chromosome 15q, generated a lod score >2.0. Additional STRPs were typed
in this area, resulting in a lod score of 3.4. STRPs FES (centromeric) and
D15S657 (telomeric) flank the 14. 5 cM region that contains an otosclerosis
gene.
相似文献
10.
Summary The authors report the results of 115 dissections of the base of the distal phalanx of fingers and toes. In 85% of cases including hypoplastic supernumerary digits, there is a connective ligament-like structure. It is a dorsal expansion of the lateral ligament of the distal inter-phalangeal joint arising from the intermediate phalanx and ending in the matrix and the lunula. This ligament may have a role in biomechanical strains on the nail. It can explain some dystrophic nails associated with some malpositioned joints in fingers or toes.
Structure ligamentaire de la base de l'ongle
Résumé Les auteurs rapportent les résultats de 115 dissections portant sur la base de la phalange distale des doigts ou des orteils. Ils retrouvent dans 85 % des cas, y compris sur des doigts hypoplasiques surnuméraires, une formation conjonctive de type ligamentaire. Il s'agit d'une expansion dorsale du ligament latéral de l'articulation interphalangienne distale, naissant de l'extrémité distale de la phalange intermédiaire et se terminant au sein de la matrice et sur la lunule. Ce ligament ostéomatriciel peut jouer un rôle dans la transmission des contraintes biomécaniques sur l'ongle et expliquer les dystrophies unguéales stéréotypées associées à certaines malpositions articulaires des doigts ou des orteils.相似文献