全文获取类型
收费全文 | 1397052篇 |
免费 | 101784篇 |
国内免费 | 7695篇 |
专业分类
耳鼻咽喉 | 20319篇 |
儿科学 | 40912篇 |
妇产科学 | 39251篇 |
基础医学 | 194503篇 |
口腔科学 | 40841篇 |
临床医学 | 120996篇 |
内科学 | 271636篇 |
皮肤病学 | 30759篇 |
神经病学 | 109775篇 |
特种医学 | 56119篇 |
外国民族医学 | 469篇 |
外科学 | 214782篇 |
综合类 | 42023篇 |
现状与发展 | 22篇 |
一般理论 | 437篇 |
预防医学 | 96394篇 |
眼科学 | 33192篇 |
药学 | 106640篇 |
58篇 | |
中国医学 | 6291篇 |
肿瘤学 | 81112篇 |
出版年
2018年 | 13975篇 |
2017年 | 11574篇 |
2016年 | 12468篇 |
2015年 | 14893篇 |
2014年 | 20320篇 |
2013年 | 28299篇 |
2012年 | 37799篇 |
2011年 | 40156篇 |
2010年 | 24155篇 |
2009年 | 22747篇 |
2008年 | 36750篇 |
2007年 | 40008篇 |
2006年 | 40483篇 |
2005年 | 39379篇 |
2004年 | 37212篇 |
2003年 | 36096篇 |
2002年 | 35290篇 |
2001年 | 64836篇 |
2000年 | 66717篇 |
1999年 | 56851篇 |
1998年 | 15680篇 |
1997年 | 14414篇 |
1996年 | 13666篇 |
1995年 | 12911篇 |
1994年 | 12127篇 |
1992年 | 43166篇 |
1991年 | 41645篇 |
1990年 | 40874篇 |
1989年 | 39826篇 |
1988年 | 37171篇 |
1987年 | 36600篇 |
1986年 | 35042篇 |
1985年 | 33194篇 |
1984年 | 24874篇 |
1983年 | 21101篇 |
1982年 | 12697篇 |
1981年 | 11593篇 |
1979年 | 23944篇 |
1978年 | 17071篇 |
1977年 | 14837篇 |
1976年 | 13388篇 |
1975年 | 15270篇 |
1974年 | 18080篇 |
1973年 | 17567篇 |
1972年 | 16810篇 |
1971年 | 15717篇 |
1970年 | 14914篇 |
1969年 | 14347篇 |
1968年 | 13461篇 |
1967年 | 12015篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Onur Hapa Hüsamettin ?ak?c? Kaan Gidero?lu Kutay ?zturan Aysel Kükner Güler Bu?dayc? 《Archives of orthopaedic and trauma surgery》2009,129(12):1721-1726
Introduction
Ethanol has a suppressive effect on inflammation and the immune system, but the effect of ethanol on tendon healing in vivo has not been studied. The purpose of this study was to investigate the histological and biomechanical effects of ethanol intake on tendon healing in a rat tendon injury model. 相似文献993.
Loa Clausen Kristian Rokkedal Jan H. Rosenvinge 《European eating disorders review》2009,17(6):462-467
The Eating Disorder Inventory, Version 2 (EDI‐2) is a questionnaire used clinically and in research all over the world. EDI‐2 is cross‐culturally valid, yet normative values may depend on culture. Norms and reliability of the Danish version have to date been lacking, and will be presented in this article, comparing patients (N = 575) and controls (N = 881). Also, internal reliability of scales is tested for both groups. Differences between norms of the Danish and the North American version of EDI were small but significant for all scales except asceticism (eating disorder patients) and ineffectiveness, interpersonal distrust and maturity fears (normal controls). For both groups the internal consistency was >0.70 for all subscales except asceticism. Although differences across the eating disorder diagnostic groups were dubious, the EDI‐2 is useful to screen for eating problems in the general population as well as to rate progress and outcome among eating disorder patients. Copyright © 2009 John Wiley & Sons, Ltd and Eating Disorders Association. 相似文献
994.
995.
996.
D.E. Hilling J.K.R.A. Rijkelijkhuizen H.A.M. Töns O.T. Terpstra E. Bouwman 《Transplantation proceedings》2009,41(1):316
When studying histological characteristics of human and porcine pancreata in relation to islet isolation, we encountered a remarkably high number of hyperemic islets. The abnormalities observed in these islets ranged from a single dilated vessel through multiple widely dilated vessels to hemorrhages extending into the surrounding exocrine tissue. We determined their possible relevance for outcomes of islet isolation. This study involved a histological examination of 143 porcine pancreata (72 juvenile and 71 adult) and islet isolation from 48 adult pancreata. Human pancreata obtained from 71 multiple organ donors yielded islet isolation in 24 cases. To determine their endocrine content, tissue samples were stained with Aldehyde Fuchsin. The presence of hyperemic islets was scored semiquantitatively with pancreata allotted to categories based on the severity. In humans and pigs we observed hyperemic islets in 48% of pancreata, but only 4.0 ± 2.4% of the islets were hyperemic. In both humans and pigs, significantly higher endocrine content was found in the most severely affected pancreata. When the higher endocrine content was taken into account and isolation results were expressed as ratios of yield and content, we observed significantly lower yields in the most affected pancreata in pigs with a trend toward lower yields in humans. A substantial proportion of human and porcine pancreata contain hyperemic islets. Although the results in humans are preliminary, our data suggest that this phenomenon may contribute to the unpredictable, highly variable islet yields in pigs and humans. 相似文献
997.
998.
Parastoo Jangouk Thomas Dehmel Gerd Meyer Zu Hörste Andreas Ludwig Helmar C. Lehmann Bernd C. Kieseier 《Glia》2009,57(16):1765-1774
The disintegrin and metalloproteinase 10 (ADAM10) is a membrane‐anchored metalloproteinase with both proteolytic and disintegrin characteristics. Here, we investigate the expression, regulation, and functional role of ADAM10 in axonal outgrowth and myelination of the peripheral nerve. Expression pattern analysis of 11 ADAM family members in co‐cultures of rat dorsal root ganglia (DRG) neurons and Schwann cells (SCs) demonstrated the most pronounced mRNA expression for ADAM10. In further studies, ADAM10 was found to be consistently upregulated in DRG‐SC co‐cultures before the induction of myelination. Neurons as well as SCs widely expressed ADAM10 at the protein level. In neurons, the expression of ADAM10 was exclusively limited to the axons before the induction of myelination. Inhibition of ADAM10 activity by the hydroxamate‐based inhibitors GI254023X and GW280264X resulted in a significant decrease in the mean axonal length. These data suggest that ADAM10 represents a prerequisite for myelination, although its activity is not required during the process of myelination itself as demonstrated by expression analysis of myelin protein zero (P0) and Sudan black staining. Hence, during the process of myelin formation, ADAM10 is highly upregulated and appears to be critically involved in axonal outgrowth that is a requirement for myelination in the peripheral nerve. © 2009 Wiley‐Liss, Inc. 相似文献
999.
Paul H. Lysaker Louanne W. Davis Gary J. Bryson Morris D. Bell 《Schizophrenia Research》2009,107(2-3):186-191
Designed to help persons with schizophrenia to persist and perform better at job placements, the Indianapolis Vocational Intervention Program (IVIP) is a program of cognitive-behavioral group and individual interventions. While its feasibility has been previously demonstrated, it is unknown whether IVIP assists persons to achieve greater levels of participation in vocational rehabilitation and higher levels of job performance. In this study, 100 participants with schizophrenia or schizoaffective disorder were offered a six month job placement and randomized to receive IVIP (n = 50) or support services (n = 50) matched for treatment intensity. Number of hours worked was recorded weekly and job performance was assessed biweekly using the Work Behavior Inventory with raters blind to condition. t-tests revealed that participants in the IVIP group worked a significantly greater number of weeks than those in the support condition. Also, repeated measures ANOVA revealed the IVIP group worked more hours across that 26 week period as well. And with regards to work performance, repeated measures of the 56 participants who worked for at least two-thirds of the intervention revealed that participants in the IVIP group had generally better work performance than those in the support condition. Results suggest a connection between cognitive-behavioral interventions and higher levels of work performance in people with schizophrenia. 相似文献
1000.