全文获取类型
收费全文 | 403375篇 |
免费 | 36988篇 |
国内免费 | 27753篇 |
专业分类
耳鼻咽喉 | 3103篇 |
儿科学 | 5207篇 |
妇产科学 | 4469篇 |
基础医学 | 43820篇 |
口腔科学 | 6600篇 |
临床医学 | 57084篇 |
内科学 | 53916篇 |
皮肤病学 | 4482篇 |
神经病学 | 19212篇 |
特种医学 | 14576篇 |
外国民族医学 | 241篇 |
外科学 | 35422篇 |
综合类 | 76378篇 |
现状与发展 | 89篇 |
一般理论 | 33篇 |
预防医学 | 30174篇 |
眼科学 | 11311篇 |
药学 | 44023篇 |
472篇 | |
中国医学 | 26136篇 |
肿瘤学 | 31368篇 |
出版年
2024年 | 1344篇 |
2023年 | 5747篇 |
2022年 | 15348篇 |
2021年 | 19510篇 |
2020年 | 15416篇 |
2019年 | 12402篇 |
2018年 | 12921篇 |
2017年 | 12500篇 |
2016年 | 11454篇 |
2015年 | 18032篇 |
2014年 | 22589篇 |
2013年 | 20755篇 |
2012年 | 30778篇 |
2011年 | 34506篇 |
2010年 | 23494篇 |
2009年 | 19161篇 |
2008年 | 23241篇 |
2007年 | 22950篇 |
2006年 | 21891篇 |
2005年 | 20681篇 |
2004年 | 13609篇 |
2003年 | 13053篇 |
2002年 | 10697篇 |
2001年 | 9107篇 |
2000年 | 8889篇 |
1999年 | 8909篇 |
1998年 | 5584篇 |
1997年 | 5454篇 |
1996年 | 4194篇 |
1995年 | 3932篇 |
1994年 | 3320篇 |
1993年 | 2139篇 |
1992年 | 2556篇 |
1991年 | 2245篇 |
1990年 | 1893篇 |
1989年 | 1619篇 |
1988年 | 1353篇 |
1987年 | 1264篇 |
1986年 | 1006篇 |
1985年 | 721篇 |
1984年 | 398篇 |
1983年 | 288篇 |
1982年 | 155篇 |
1981年 | 181篇 |
1980年 | 120篇 |
1979年 | 163篇 |
1978年 | 73篇 |
1977年 | 53篇 |
1974年 | 42篇 |
1972年 | 37篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Platelet function has been described by many laboratory assays, and PL-11 is a new point-of-care platelet function analyzer based on platelet count drop method, which counts platelet before and after the addition of agonists in the citrated whole blood samples. The present study sought to compare PL-11 with other three major more established assays, light transmission aggregometry (LTA), VerifyNow? aspirin system and thromboelastography (TEG), for monitoring the short-term aspirin responses in healthy individuals. Ten healthy young men took 100?mg/d aspirin for 3-day treatment. Platelet function was measured via PL-11, LTA, VerifyNow and TEG, respectively. The blood samples were collected at baseline, 2 hour, 1 day during the aspirin treatment and 1 day, 5?±?1 days, 8?±?1 days after the aspirin withdrawal. Moreover, 90 additional healthy subjects were recruited to establish a reference range for PL-11. Platelet function of healthy subjects decreased significantly 2 hours after 100?mg/d aspirin intake and began to recover during 4–6 days after the aspirin withdrawal. Correlations between methods were PL-11 vs. LTA (r?=?0.614, p?<?0.01); PL-11 vs. VerifyNow (r?=?0.829, p?<?0.01); PL-11 vs. TEG (r?=?0.697, p?<?0.001). There was no significant bias between PL-11 and LTA at baseline (bias?=?1.94%, p?=?0.804) using Bland-Altman analysis, while the data of PL-11 were significantly higher than LTA (bias?=?24.02%, p?<?0.001) during the aspirin therapy. The reference range for PL-11 in healthy young individuals was from 66.8 to 90.5% (95%CI). When aspirin low-responsiveness was defined as LTA?>?20%, the cut-off values for each method were, respectively: PL-11?>?50%, VerifyNow?>?533 ARU, TEG?>?60.2%. The results of different platelet function assays were uninterchangeable for monitoring aspirin response and correlations among them were also varied. Correlations among PL-11 and other three major assays suggested the ability of PL-11 to assess the treatment effects of aspirin. But a large cohort study is needed to confirm the cut-off value of aspirin response detected by PL-11. 相似文献
32.
33.
骨碎补是历代临床常用中药,具有疗伤止痛、补肾强骨、消风祛斑等功效。其主要含黄酮、苯丙素、三萜、酚酸及其苷等类化学成分,现代研究表明骨碎补具有抗骨质疏松、促进骨折愈合、促软骨再生、护牙健齿、保护肾功能、抗炎、防治中毒性耳聋、降血脂等多种生物活性,开发前景广阔。本文对近年来骨碎补的化学成分、药理作用及临床应用研究进行综述,以期为骨碎补的进一步深入系统的研究和开发利用提供依据。 相似文献
34.
35.
Haochu Li Xiaoming Li Lai Sze Tso Shan Qiao Eleanor Holroyd Yuejiao Zhou 《Vulnerable children and youth studies》2016,11(2):173-179
In HIV/AIDS research, few studies to date have evaluated ways to improve parental HIV disclosure practices using feedback from HIV-negative children who have recently experienced this event. We conducted semi-structured in-depth interviews with 20 children (aged 6–15) who were partially to fully aware of their parents’ HIV status in rural Guangxi, China. Of the 20 children, eight children who were of older age (11.38 years in average) endorsed parental HIV disclosure, five discouraged it and seven expressed uncertainty. Children’s different experiences and attitudes towards disclosure were seen to be associated with their family dynamics (especially the parent–child relationship), social support and care, experiences of stigma and discrimination, psychosocial suffering, comprehension of the disease and the children’s age. Our study contributes to building a child-centered comprehensive understanding for Chinese parental HIV disclosure. It is imperative that counselors and community advocates assess and help parents achieve optimal readiness preceding disclosure of their illness to their HIV-negative children. 相似文献
36.
37.
38.
39.
40.
PNPLA3 gene polymorphism and response to lifestyle modification in patients with nonalcoholic fatty liver disease 下载免费PDF全文