全文获取类型
收费全文 | 9912篇 |
免费 | 921篇 |
国内免费 | 105篇 |
专业分类
耳鼻咽喉 | 126篇 |
儿科学 | 262篇 |
妇产科学 | 265篇 |
基础医学 | 1243篇 |
口腔科学 | 211篇 |
临床医学 | 878篇 |
内科学 | 2337篇 |
皮肤病学 | 128篇 |
神经病学 | 829篇 |
特种医学 | 285篇 |
外科学 | 1504篇 |
综合类 | 327篇 |
一般理论 | 6篇 |
预防医学 | 569篇 |
眼科学 | 314篇 |
药学 | 608篇 |
1篇 | |
中国医学 | 76篇 |
肿瘤学 | 969篇 |
出版年
2023年 | 80篇 |
2022年 | 161篇 |
2021年 | 300篇 |
2020年 | 219篇 |
2019年 | 305篇 |
2018年 | 310篇 |
2017年 | 239篇 |
2016年 | 292篇 |
2015年 | 361篇 |
2014年 | 428篇 |
2013年 | 487篇 |
2012年 | 678篇 |
2011年 | 685篇 |
2010年 | 429篇 |
2009年 | 344篇 |
2008年 | 553篇 |
2007年 | 540篇 |
2006年 | 548篇 |
2005年 | 469篇 |
2004年 | 466篇 |
2003年 | 479篇 |
2002年 | 373篇 |
2001年 | 250篇 |
2000年 | 259篇 |
1999年 | 176篇 |
1998年 | 87篇 |
1997年 | 67篇 |
1996年 | 66篇 |
1995年 | 40篇 |
1994年 | 48篇 |
1993年 | 41篇 |
1992年 | 108篇 |
1991年 | 97篇 |
1990年 | 115篇 |
1989年 | 81篇 |
1988年 | 82篇 |
1987年 | 90篇 |
1986年 | 78篇 |
1985年 | 85篇 |
1984年 | 64篇 |
1983年 | 43篇 |
1982年 | 29篇 |
1981年 | 28篇 |
1980年 | 24篇 |
1979年 | 34篇 |
1978年 | 21篇 |
1977年 | 18篇 |
1976年 | 19篇 |
1975年 | 25篇 |
1973年 | 19篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
13.
14.
During a 12-month period ending on November 30, 1988, data on 133 pediatric patients visiting a pediatric emergency department with water-related injuries were collected. Of these patients, 70% were male. There were 13 submersions, seven cases of head trauma, three cases of neck trauma, 88 cases of external injury, and 34 other injuries. Incidents took place at beaches (75%) in public pools (12%), in friends' pools (4%), and in home pools (4%). Eighty-six percent of the cohort knew how to swim. Swimming, playing, and surfing activity accounted for most of the injuries. Measures for prevention are described. 相似文献
15.
16.
17.
在全科医疗诊断抑郁症时,在原有2个问题的筛查问卷基础上再增加一个问题(病人是否要求立即帮助解决抑郁症状),可增加筛查的特异性。Arroll及其同事报告了一个横向交叉诊断可靠性研究结果。该研究包括了新西兰6个诊所中19个全科医生和1000名以上连续病人。采用两个筛查问题再加一个问题的方法,全科医生正确诊断抑郁症率达到79%,对没有抑郁症者的正确评估率为94%。 相似文献
18.
W. Y. Zhang Research Fellow A. Li Wan Po Professor 《BJOG : an international journal of obstetrics and gynaecology》1998,105(7):780-789
Objective To quantify the efficacy and safety of naproxen, ibuprofen, mefenamic acid, aspirin and acetaminophen (paracetamol) in the treatment of primary dysmenorrhoea through a systemic overview of randomised controlled trials.
Methods MEDLINE, EMBASE and the Science Citation Index were searched for randomised controlled trials. Efficacy was assessed by measurement of pain relief, requirement for rescue analgesics, restriction of daily life and absence from work or school. The rate ratios of side effects were used to assess safety.
Results Fifty-six trials describing 55 comparisons of analgesics with placebo and 12 direct comparisons with other analgesics met our inclusion criteria. Women taking naproxen were over three times more likely to have at least moderate pain relief than those taking placebo. Ibuprofen, mefenamic acid and aspirin were also superior to placebo but acetaminophen was not. The requirement for rescue analgesics, restriction of daily life and absence from work or school were less frequent with naproxen and ibuprofen than placebo but not with aspirin or acetaminophen. Direct comparisons did not show any difference between naproxen and ibuprofen. Side effects occurred more frequently only with naproxen when compared with placebo.
Conclusion Naproxen, ibuprofen, mefenamic acid and aspirin are all effective in primary dysmenorrhoea. Ibuprofen appears to have the most favourable risk-benefit ratio. Acetaminophen appears to be less effective than nonsteroidal anti-inflammatory drugs, but there was only one trial meeting our inclusion criteria and further studies are required. 相似文献
Methods MEDLINE, EMBASE and the Science Citation Index were searched for randomised controlled trials. Efficacy was assessed by measurement of pain relief, requirement for rescue analgesics, restriction of daily life and absence from work or school. The rate ratios of side effects were used to assess safety.
Results Fifty-six trials describing 55 comparisons of analgesics with placebo and 12 direct comparisons with other analgesics met our inclusion criteria. Women taking naproxen were over three times more likely to have at least moderate pain relief than those taking placebo. Ibuprofen, mefenamic acid and aspirin were also superior to placebo but acetaminophen was not. The requirement for rescue analgesics, restriction of daily life and absence from work or school were less frequent with naproxen and ibuprofen than placebo but not with aspirin or acetaminophen. Direct comparisons did not show any difference between naproxen and ibuprofen. Side effects occurred more frequently only with naproxen when compared with placebo.
Conclusion Naproxen, ibuprofen, mefenamic acid and aspirin are all effective in primary dysmenorrhoea. Ibuprofen appears to have the most favourable risk-benefit ratio. Acetaminophen appears to be less effective than nonsteroidal anti-inflammatory drugs, but there was only one trial meeting our inclusion criteria and further studies are required. 相似文献
19.
20.
Anti-angiogenic effects of Hypericin-photodynamic therapy in combination with Celebrex in the treatment of human nasopharyngeal carcinoma 总被引:4,自引:0,他引:4
Photodynamic therapy (PDT) is being investigated as an alternative treatment modality in cancer treatment. It has been shown to induce tumor hypoxia and upregulation of cyclooxygenase-2 (COX-2) and vascular endothelial growth factor (VEGF). The objective of this study was to improve in vivo tumor growth control of nasopharyngeal carcinoma (NPC), treated at a subcurative dosage by using a combination of Hypericin-PDT and COX-2 inhibitor, Celebrex (CX). The effect of an initial CX dose at 6- and 24-h post-PDT was investigated simultaneously. It was observed that hypoxic NPC/CNE2 cells upregulate both COX-2 and VEGF A genes in vitro. In vivo studies, down-regulation of COX-2 and hypoxia inducible factor-1alpha (HIF-1alpha) genes at 24-h post-PDT and bulk tumor ablation at 48-h post-PDT was observed. However, 24-28 days later regrowth was observed. In a combination treatment, 1st CX dose at 6-h post-PDT had the highest tumor control in which tumors were 相似文献