全文获取类型
收费全文 | 7849篇 |
免费 | 545篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 57篇 |
儿科学 | 190篇 |
妇产科学 | 114篇 |
基础医学 | 923篇 |
口腔科学 | 116篇 |
临床医学 | 845篇 |
内科学 | 1411篇 |
皮肤病学 | 94篇 |
神经病学 | 529篇 |
特种医学 | 270篇 |
外科学 | 1357篇 |
综合类 | 165篇 |
一般理论 | 7篇 |
预防医学 | 748篇 |
眼科学 | 399篇 |
药学 | 622篇 |
中国医学 | 3篇 |
肿瘤学 | 555篇 |
出版年
2023年 | 65篇 |
2022年 | 78篇 |
2021年 | 218篇 |
2020年 | 99篇 |
2019年 | 200篇 |
2018年 | 214篇 |
2017年 | 148篇 |
2016年 | 153篇 |
2015年 | 169篇 |
2014年 | 276篇 |
2013年 | 346篇 |
2012年 | 539篇 |
2011年 | 578篇 |
2010年 | 327篇 |
2009年 | 252篇 |
2008年 | 452篇 |
2007年 | 457篇 |
2006年 | 404篇 |
2005年 | 423篇 |
2004年 | 375篇 |
2003年 | 385篇 |
2002年 | 300篇 |
2001年 | 155篇 |
2000年 | 168篇 |
1999年 | 163篇 |
1998年 | 67篇 |
1997年 | 50篇 |
1996年 | 48篇 |
1995年 | 46篇 |
1994年 | 38篇 |
1993年 | 45篇 |
1992年 | 94篇 |
1991年 | 106篇 |
1990年 | 85篇 |
1989年 | 77篇 |
1988年 | 83篇 |
1987年 | 75篇 |
1986年 | 62篇 |
1985年 | 57篇 |
1984年 | 44篇 |
1983年 | 35篇 |
1982年 | 26篇 |
1981年 | 35篇 |
1979年 | 48篇 |
1978年 | 37篇 |
1977年 | 31篇 |
1974年 | 27篇 |
1973年 | 23篇 |
1972年 | 39篇 |
1971年 | 20篇 |
排序方式: 共有8405条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Darren R. Feldman MD Yasser Ged MBBS Chung-Han Lee PhD Andrea Knezevic MS Ana M. Molina MD Ying-Bei Chen PhD Joshua Chaim DO Devyn T. Coskey MS Samuel Murray MS Satish K. Tickoo MD Victor E. Reuter MD Sujata Patil PhD Han Xiao MD Jahan Aghalar MD Arlyn J. Apollo MD Maria I. Carlo MD Robert J. Motzer MD Martin H. Voss MD 《Cancer》2020,126(24):5247-5255
6.
7.
Tracy Brightman Jiang-Hong Ye Elizabeth Ortiz-Jimenez Edward J. Flynn Wen-Hsien Wu Joseph J. McArdle 《Brain research》1995,678(1-2)
While adult mice receiving picrotoxin (PTX) alone responded with clonic and tonic-clonic seizures, this response was greatly suppressed for mice simultaneously injected with 2,3-butanedione monoxime (BDM). For example, 60% and 10% of the mice convulsed when injected (i.p.) with 3.0 mg/kg PTX alone or PTX plus 205 mg/kg of BDM, respectively. In contrast, a non-oxime analogue of BDM, 2,3-butanedione (BTD), did not have this anticonvulsant effect. In order to explore the basis for the anticonvulsant effect of BDM, we recorded GABA-activated currents (IGABA) of frontal cortical as well as ventromedial hypothalamic neurons before, during and after exposure to this oxime. BDM had a biphasic effect on concentrations (100 μM-40 mM) decreased and lower concentrations (0.01 μM–0.001 μM) potentiatedIGABA; these effects of BDM reversed upon washout of the oxime. In contrast, BTD had no effect onIGABA. Finally, when 0.001 μM BDM, 10–30 μM PTX and GABA were co-applied the inhibitory effect of the toxin onIGABA was markedly suppressed. These data suggest that the anticonvulsant effect of oximes involves facilitation of the inhibitory action of GABA. 相似文献
8.
The sodium, potassium and creatinine contents of three non-consecutive 24-h urine samples collected by 34 selected adult individuals (10 m; 24 f) living in Cork City were determined. The pooled mean 24-h excretion of sodium and potassium in collections adjudged to be complete were 152 mmol and 78 mmol, respectively. There was no significant difference between group average weekday and weekend-day excretion of Na or K, for either males or females. This suggests that weekend 24-h urinary collections, which most subjects find more convenient, are suitable for studies of sodium and potassium intakes of groups. The ratios of intra- to inter-individual variation for 24-h urinary sodium were 1.4 and 2.1 for males and females, respectively. The corresponding ratios for 24-h urinary potassium were 6.6 for males and 4.9 for females. These ratios indicated that there were large individual day-to-day variations in urinary sodium and potassium excretion in this group. It was estimated that a sample size of 35-60 individuals would be required to estimate group mean sodium and potassium intakes by means of single 24-h urine collections. 相似文献
9.
10.