全文获取类型
收费全文 | 2327篇 |
免费 | 190篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 25篇 |
儿科学 | 30篇 |
妇产科学 | 28篇 |
基础医学 | 297篇 |
口腔科学 | 85篇 |
临床医学 | 220篇 |
内科学 | 365篇 |
皮肤病学 | 71篇 |
神经病学 | 183篇 |
特种医学 | 273篇 |
外科学 | 310篇 |
综合类 | 70篇 |
一般理论 | 1篇 |
预防医学 | 139篇 |
眼科学 | 137篇 |
药学 | 117篇 |
中国医学 | 3篇 |
肿瘤学 | 172篇 |
出版年
2023年 | 17篇 |
2022年 | 19篇 |
2021年 | 89篇 |
2020年 | 71篇 |
2019年 | 63篇 |
2018年 | 77篇 |
2017年 | 46篇 |
2016年 | 60篇 |
2015年 | 76篇 |
2014年 | 95篇 |
2013年 | 127篇 |
2012年 | 153篇 |
2011年 | 134篇 |
2010年 | 71篇 |
2009年 | 78篇 |
2008年 | 120篇 |
2007年 | 112篇 |
2006年 | 110篇 |
2005年 | 105篇 |
2004年 | 87篇 |
2003年 | 54篇 |
2002年 | 58篇 |
2001年 | 42篇 |
2000年 | 38篇 |
1999年 | 47篇 |
1998年 | 39篇 |
1997年 | 31篇 |
1996年 | 29篇 |
1995年 | 26篇 |
1994年 | 26篇 |
1993年 | 19篇 |
1992年 | 20篇 |
1991年 | 14篇 |
1990年 | 24篇 |
1989年 | 45篇 |
1988年 | 36篇 |
1987年 | 39篇 |
1986年 | 30篇 |
1985年 | 29篇 |
1984年 | 35篇 |
1983年 | 15篇 |
1982年 | 14篇 |
1981年 | 23篇 |
1980年 | 16篇 |
1979年 | 11篇 |
1978年 | 13篇 |
1977年 | 9篇 |
1976年 | 11篇 |
1975年 | 5篇 |
1974年 | 5篇 |
排序方式: 共有2526条查询结果,搜索用时 0 毫秒
1.
A mixed‐method study of effects of a therapeutic play intervention for children on parental anxiety and parents' perceptions of the intervention
下载免费PDF全文
![点击此处可从《Journal of advanced nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
2.
3.
Williamson Kathleen A.; Hever Ann M.; Rainger Joe; Rogers R. Curtis; Magee Alex; Fiedler Zdenek; Keng Wee Teik; Sharkey Freddie H.; McGill Niolette; Hill Clare J.; Schneider Adele; Messina Mario; Turnpenny Peter D.; Fantes Judy A.; van Heyningen Veronica; FitzPatrick David R. 《Human molecular genetics》2006,15(12):2030
Table 1 相似文献
4.
5.
Michael Altmann Beeling C. Wee Keith Willard Denton Peterson Laël C. Gatewood 《Statistics in medicine》1994,13(1):53-60
The authors measure the efficacy of three methods for predicting the time to infection for susceptible individuals in a population undergoing an HIV epidemic. The methods differ in whether they require detailed information of the contact network and whether they require knowledge of the initial source of infection. Efficacy is evaluated using simulations for 20 different contact patterns. Only the risk score that uses both kinds of information accounts for more than 15 per cent of individual variability. The efficacy of this score ranges from 10 per cent in very unstructured populations to 60 per cent for spatially localized contact networks. This improved performance may be explained by the larger fraction of the total variability not due to the disease dynamics. When all variables are dichotomized, the two poorer methods produce odds ratios between 1.4 and 2.3. The odds ratio for the risk score with full information ranges from 2.5 to 17. Risk assessment protocols and intervention programmes are encouraged to assess contact patterns and detect sources of infection. 相似文献
6.
7.
Normal and diseased isolated lungs: high-resolution CT 总被引:8,自引:0,他引:8
8.
9.
M J O Taylor L Y Wee M L Denbow N M Fisk 《Ultrasound in obstetrics & gynecology》2004,24(4):479; author reply 479-479; author reply 481
10.
Picotamide inhibition of excess in vitro thromboxane B2 release by colorectal mucosa in inflammatory bowel disease. 总被引:1,自引:0,他引:1
Collins CE Benson MJ Burnham WR Rampton DS 《Alimentary pharmacology & therapeutics》1996,10(3):315-320
BACKGROUND: Inflammatory bowel disease is associated with increased mucosal release of eicosanoids. Among these, thromboxane A2 has been proposed as a possible inflammatory mediator; its suppression may be a useful therapeutic option. METHODS: Using a tissue incubation technique, we compared release of immunoreactive thromboxane B2 by colonic biopsies from patients with ulcerative colitis, Crohn's disease and controls, and assessed the inhibitory effect of picotamide, a thromboxane synthesis inhibitor-receptor antagonist, which has been widely used in Italy for management of ischaemic heart and cerebrovascular disease. RESULTS: Increased amounts of thromboxane B2 were released from biopsies from patients with active ulcerative colitis (median 238 pg/20 min/mg wet weight (interquartile range 147- 325), n = 12) and active Crohn's disease (252 (174-450), 6) compared with those from patients with quiescent ulcerative colitis (95 (61- 140), 12) or Crohn's disease (105 (57-201), 13), or controls (136 (64- 206), 8). Incubation with picotamide at concentrations between 100 microM and 1 mM reduced thromboxane B2 release (IC50 890 microM). CONCLUSION: Since increased thromboxane A2 production may have pathogenetic importance, thromboxane synthesis inhibitor-receptor antagonists such as picotamide merit therapeutic trial in the management of inflammatory bowel disease. 相似文献