全文获取类型
收费全文 | 8425篇 |
免费 | 572篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 128篇 |
儿科学 | 329篇 |
妇产科学 | 186篇 |
基础医学 | 1226篇 |
口腔科学 | 119篇 |
临床医学 | 941篇 |
内科学 | 1643篇 |
皮肤病学 | 105篇 |
神经病学 | 799篇 |
特种医学 | 193篇 |
外科学 | 1028篇 |
综合类 | 47篇 |
一般理论 | 14篇 |
预防医学 | 866篇 |
眼科学 | 170篇 |
药学 | 674篇 |
中国医学 | 10篇 |
肿瘤学 | 530篇 |
出版年
2023年 | 84篇 |
2022年 | 137篇 |
2021年 | 324篇 |
2020年 | 177篇 |
2019年 | 270篇 |
2018年 | 290篇 |
2017年 | 228篇 |
2016年 | 234篇 |
2015年 | 277篇 |
2014年 | 355篇 |
2013年 | 513篇 |
2012年 | 723篇 |
2011年 | 682篇 |
2010年 | 319篇 |
2009年 | 303篇 |
2008年 | 512篇 |
2007年 | 507篇 |
2006年 | 464篇 |
2005年 | 460篇 |
2004年 | 353篇 |
2003年 | 257篇 |
2002年 | 274篇 |
2001年 | 110篇 |
2000年 | 93篇 |
1999年 | 75篇 |
1998年 | 64篇 |
1997年 | 35篇 |
1996年 | 29篇 |
1995年 | 32篇 |
1994年 | 34篇 |
1993年 | 31篇 |
1992年 | 57篇 |
1991年 | 46篇 |
1990年 | 38篇 |
1989年 | 34篇 |
1988年 | 41篇 |
1987年 | 20篇 |
1986年 | 25篇 |
1985年 | 29篇 |
1984年 | 23篇 |
1983年 | 27篇 |
1982年 | 22篇 |
1980年 | 16篇 |
1979年 | 26篇 |
1978年 | 23篇 |
1974年 | 19篇 |
1970年 | 16篇 |
1967年 | 19篇 |
1966年 | 15篇 |
1941年 | 17篇 |
排序方式: 共有9008条查询结果,搜索用时 15 毫秒
1.
As millions of people turn to social media for health information, better understanding the factors that guide health-related judgments and perceptions in this context is imperative. We report on two Web experiments (n > 400 total) examining the power of society’s widespread weight bias and related stereotypes to influence nutrition judgments in social media spaces. In Experiment 1, meals were judged as lower in nutritional quality when the person who recommended them (the source) was depicted as obese rather than of normal weight, an effect mediated by stereotypic beliefs about the source as a generally unhealthy person. Experiment 2 replicated this effect, which—notably—remained significant when controlling for objective nutritional information (calories and fat content). Results highlight spillover effects of weight bias that extend beyond person perception to color impressions of objects (here, food) that are associated with stigmatized attributes. Implications for everyday nutrition judgments and public health are considered. 相似文献
2.
3.
4.
Setting goals to maintain hope. 总被引:3,自引:0,他引:3
5.
Diarrhetic shellfish poisoning (DSP) is a serious and globally widespread phytoplankton-related seafood illness. Although DSP is rarely life-threatening, it causes incapacitating diarrhea and vomiting with no known medical treatments. In addition, phytoplankton producing DSP toxins have been identified in temperate coastal waters worldwide, and their numbers may be increasing as a result of coastal eutrophication. The toxic effects of the major DSP toxins, okadaic acid and dinophysistoxin-1 (35-methylokadaic acid), appear to originate from their inhibitory activity against a family of structurally related serine/threonine protein phosphatases (PSPases). In particular, the inhibition of essential PSPases (e.g. PP1 and PP2A) has catastrophic consequences in most eukaryotic cells. Exploiting the potent inhibitory property of the DSP toxins, we have developed an enzyme-based assay (PP2A assay) capable of detecting both okadaic acid and dinophysis- toxin-1 in nanogram amounts. The assay employs purified PP2A, which has an extremely high affinity for both DSP toxins. This provides the PP2A assay with a level of sensitivity comparable to, or surpassing, that of most monoclonal antibody probes. To evaluate the PP2A assay as a means of detecting contaminated shellfish, a series of spike recovery experiments was conducted. The findings from these studies suggest that the PP2A assay has the potential for development into a rapid and relatively simple method for detecting PSPase inhibitors in crude extracts produced from shellfish. 相似文献
6.
7.
8.
9.
10.