全文获取类型
收费全文 | 22531篇 |
免费 | 1801篇 |
国内免费 | 108篇 |
专业分类
耳鼻咽喉 | 339篇 |
儿科学 | 656篇 |
妇产科学 | 480篇 |
基础医学 | 3105篇 |
口腔科学 | 471篇 |
临床医学 | 2094篇 |
内科学 | 5343篇 |
皮肤病学 | 348篇 |
神经病学 | 2034篇 |
特种医学 | 853篇 |
外科学 | 3504篇 |
综合类 | 328篇 |
一般理论 | 16篇 |
预防医学 | 1688篇 |
眼科学 | 586篇 |
药学 | 1190篇 |
中国医学 | 41篇 |
肿瘤学 | 1364篇 |
出版年
2023年 | 160篇 |
2022年 | 313篇 |
2021年 | 782篇 |
2020年 | 410篇 |
2019年 | 620篇 |
2018年 | 746篇 |
2017年 | 495篇 |
2016年 | 511篇 |
2015年 | 629篇 |
2014年 | 812篇 |
2013年 | 1104篇 |
2012年 | 1517篇 |
2011年 | 1539篇 |
2010年 | 878篇 |
2009年 | 765篇 |
2008年 | 1272篇 |
2007年 | 1265篇 |
2006年 | 1248篇 |
2005年 | 1184篇 |
2004年 | 1079篇 |
2003年 | 945篇 |
2002年 | 943篇 |
2001年 | 171篇 |
2000年 | 149篇 |
1999年 | 185篇 |
1998年 | 263篇 |
1997年 | 237篇 |
1996年 | 213篇 |
1995年 | 175篇 |
1994年 | 179篇 |
1993年 | 164篇 |
1992年 | 121篇 |
1991年 | 117篇 |
1990年 | 131篇 |
1989年 | 131篇 |
1988年 | 148篇 |
1987年 | 145篇 |
1986年 | 102篇 |
1985年 | 131篇 |
1984年 | 129篇 |
1983年 | 113篇 |
1982年 | 156篇 |
1981年 | 143篇 |
1980年 | 177篇 |
1979年 | 94篇 |
1978年 | 101篇 |
1977年 | 95篇 |
1976年 | 100篇 |
1975年 | 75篇 |
1974年 | 77篇 |
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
101.
102.
103.
104.
105.
Thompson Debra A.; Janecke Andreas R.; Lange Jessica; Feathers Kecia L.; Hubner Christian A.; McHenry Christina L.; Stockton David W.; Rammesmayer Gabriele; Lupski James R.; Antinolo Guillermo; Ayuso Carmen; Baiget Montserrat; Gouras Peter; Heckenlively John R.; den Hollander Anneke; Jacobson Samuel G.; Lewis Richard A.; Sieving Paul A.; Wissinger Bernd; Yzer Suzanne; Zrenner Eberhart; Utermann Gerd; Gal Andreas 《Human molecular genetics》2006,15(9):1559
Human Molecular Genetics 相似文献
106.
Van Buskirk Glenn A. González Mario A. Shah Vinod P. Barnhardt Scott Barrett Colin Berge Stephen Cleary Gary Chan Keith Flynn Gordon Foster Thomas Gale Robert Garrison Raymond Gochnour Scott Gotto Amanda Govil Sharad Gray Vivian A. Hammar James Harder Samuel Hoiberg Charles Hussain Ajaz Karp Carol Llanos Hector Mantelle Juan Noonan Patrick Swanson David Zerbe Horst 《Pharmaceutical research》1997,14(7):848-852
Pharmaceutical Research - 相似文献
107.
108.
O. Samuel 《Postgraduate medical journal》1993,69(814):629-633
109.
Concentric sclerosis (Baló): Morphometric and in situ hybridization study of lesions in six patients
Da-Lin Yao Henry deF. Webster Lynn D. Hudson Michael Brenner Duo-San Liu Alfonso I. Escobar Samuel Komoly 《Annals of neurology》1994,35(1):18-30
Brain tissues from 6 patients with concentric sclerosis (Baló) were examined by in situ hybridization, immunocytochemistry, morphometry, and histological methods. The patients were 24 to 48 years old and had progressive cerebral symptoms and signs that lasted 15 to 100 days. Large demyelinative lesions, most frequent in the frontal white matter, contained alternating bands of demyelinated and partly myelinated white matter that were arranged in concentric or mosaic patterns. In the areas of demyelination, axons were relatively well preserved and there were perivascular inflammatory infiltrates. In 2 specimens, lesions contained regions with the characteristic appearance of actively demyelinating multiple sclerosis plaques. Oligodendroglial densities were highest in normal-appearing white matter, lower in partially myelinated areas, and lowest in demyelinated areas, which also contained many hypertrophic astrocytes closely associated with oligodendroglia. Messenger RNA levels for myelin-related proteins followed the same pattern; they were lowest in demyelinated areas, higher in partially myelinated areas, and highest in normal-appearing white matter beyond lesion margins. Our findings suggest that concentric sclerosis is a variant of multiple sclerosis, that oligodendroglial loss is important in the pathogenesis of demyelination, and that partially myelinated areas probably represent stages of ongoing myelin breakdown rather than remyelination of previously demyelinated areas. 相似文献
110.
O6-methylguanine-DNA methyltransferase in human fetal tissues: fetal and maternal factors 总被引:1,自引:0,他引:1
O6-Methylguanine methyltransferase (O6-MT) was measured and compared in extracts of 7 human fetal tissues obtained from 21 different fetal specimens as a function of fetal age and race and of maternal smoking and drug usage. Liver exhibited the highest activity followed by kidney, lung, small intestine, large intestine, skin, and brain. Each fetal organ homogenate exhibited a 3- to 5-fold level of interindividual variation of O6-MT. There did not appear to be any significant differences of O6-MT as a function of fetal race and age and in the tissues obtained from mothers who smoked cigarettes during pregnancy. The fetal tissues obtained from an individual using phenobarbital exhibited 4-fold increases in O6-MT activity. The tissues obtained from another individual on kidney dialysis were 2- to 3-fold higher than the normal population. These data suggest a possible enhancement of human fetal O6-MT by certain xenobiotics, with little if any modulation by racial factors and maternal smoking habits. 相似文献