全文获取类型
收费全文 | 3381篇 |
免费 | 234篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 42篇 |
儿科学 | 91篇 |
妇产科学 | 56篇 |
基础医学 | 379篇 |
口腔科学 | 111篇 |
临床医学 | 524篇 |
内科学 | 951篇 |
皮肤病学 | 57篇 |
神经病学 | 145篇 |
特种医学 | 185篇 |
外国民族医学 | 2篇 |
外科学 | 339篇 |
综合类 | 103篇 |
一般理论 | 5篇 |
预防医学 | 304篇 |
眼科学 | 25篇 |
药学 | 121篇 |
1篇 | |
中国医学 | 19篇 |
肿瘤学 | 163篇 |
出版年
2021年 | 40篇 |
2020年 | 31篇 |
2019年 | 45篇 |
2018年 | 64篇 |
2017年 | 38篇 |
2016年 | 44篇 |
2015年 | 66篇 |
2014年 | 75篇 |
2013年 | 98篇 |
2012年 | 131篇 |
2011年 | 162篇 |
2010年 | 125篇 |
2009年 | 113篇 |
2008年 | 157篇 |
2007年 | 186篇 |
2006年 | 144篇 |
2005年 | 137篇 |
2004年 | 131篇 |
2003年 | 121篇 |
2002年 | 115篇 |
2001年 | 76篇 |
2000年 | 73篇 |
1999年 | 71篇 |
1998年 | 62篇 |
1997年 | 49篇 |
1996年 | 53篇 |
1995年 | 45篇 |
1994年 | 42篇 |
1993年 | 25篇 |
1992年 | 78篇 |
1991年 | 51篇 |
1990年 | 67篇 |
1989年 | 63篇 |
1988年 | 67篇 |
1987年 | 73篇 |
1986年 | 49篇 |
1985年 | 63篇 |
1984年 | 50篇 |
1983年 | 55篇 |
1982年 | 31篇 |
1980年 | 36篇 |
1979年 | 31篇 |
1978年 | 32篇 |
1977年 | 35篇 |
1976年 | 29篇 |
1975年 | 27篇 |
1974年 | 25篇 |
1972年 | 25篇 |
1971年 | 28篇 |
1970年 | 22篇 |
排序方式: 共有3623条查询结果,搜索用时 903 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.
B. Maurer J.H.W. Distler F. Moritz S. Gay PD Dr. O. Distler 《Zeitschrift für Rheumatologie》2007,66(4):304-310
In contrast to vasculogenesis, angiogenesis is defined as the formation of new vessels from preexisting ones. Physiologically, this multistep process occurs in adults during the reproductive cycle and during pregnancy, pathophysiologically it can be found in wound healing, inflammation and carcinogenesis. The underlying mechanisms are vasodilatation and increasing permeability, destabilization of vessel walls and degradation of extracellular matrix, followed by the proliferation and migration of endothelial cells. Migrated endothelial cells form vascular tubes at sites of ischemia and these tubes are finally stabilized by pericytes and smooth muscle cells. This process is controlled by a complex interaction of angiogenic and angiostatic factors. In contrast to carcinogenesis, the role of angiogenesis for the pathogenesis and therapy of rheumatic diseases is less understood. Two examples for pathologically disturbed angiogenesis, rheumatoid arthritis and systemic sclerosis, are discussed in this review with respect to therapeutic options. 相似文献
4.
AMPK在妊娠期糖尿病发病机制中的作用 总被引:1,自引:0,他引:1
腺苷酸活化蛋白激酶是一种重要的蛋白激酶,主要作用是协调代谢和能量平衡.腺苷酸活化蛋白激酶被激活后,在增加骨骼肌对葡萄糖摄取、增强胰岛素敏感性、增加脂肪酸氧化以及调节基因转录等方面发挥重要作用.已经证实脂联素有调节糖脂代谢的作用,但其作用机制尚不十分清楚,很可能是通过腺苷酸活化蛋白激酶介导,对脂联素信号转导通路的研究将成为进一步理解脂联素作用的关键所在.而脂联素又是妊娠期糖尿病的预测因子,所以腺苷酸活化蛋白激酶逐渐成为对妊娠期糖尿病研究中的焦点. 相似文献
5.
Donald B. Penzien PhD ; Frank Andrasik PhD ; Brian M. Freidenberg PhD ; Timothy T. Houle PhD ; Alvin E. Lake III PhD; Gay L. Lipchik PhD ; Kenneth A. Holroyd PhD ; Richard B. Lipton MD ; Douglas C. McCrory MD ; Justin M. Nash PhD ; Robert A. Nicholson PhD ; Scott W. Powers PhD ABPP ; Jeanetta C. Rains PhD ; David A. Wittrock PhD 《Headache》2005,45(S2):S110-S132
Guidelines for design of clinical trials evaluating behavioral headache treatments were developed to facilitate production of quality research evaluating behavioral therapies for management of primary headache disorders. These guidelines were produced by a Workgroup of headache researchers under auspices of the American Headache Society. The guidelines are complementary to and modeled after guidelines for pharmacological trials published by the International Headache Society, but they address methodologic considerations unique to behavioral and other nonpharmacological treatments. Explicit guidelines for evaluating behavioral headache therapies are needed as the optimal methodology for behavioral (and other nonpharmacologic) trials necessarily differs from the preferred methodology for drug trials. In addition, trials comparing and integrating drug and behavioral therapies present methodological challenges not addressed by guidelines for pharmacologic research. These guidelines address patient selection, trial design for behavioral treatments and for comparisons across multiple treatment modalities (eg, behavioral vs pharmacologic), evaluation of results, and research ethics. Although developed specifically for behavioral therapies, the guidelines may apply to the design of clinical trials evaluating many forms of nonpharmacologic therapies for headache. 相似文献
6.
C Gay Escoda 《Avances en Odontoestomatología》1987,3(4):169-72, 175-9
7.
G. Bradley Schaefer James N. Thompson John B. Bodensteiner James M. McConnell William J. Kimberling Charles T. Gay William D. Dutton David C. Hutchings Stanton B. Gray 《Annals of neurology》1996,39(3):382-385
There are conflicting reports on the relationship between cerebellar vermal lobule hypoplasia and autism. Using quantitative magnetic resonance image analysis, we measured the cerebellar vermis in 125 normal individuals with a broad age range and 102 patients with a variety of neurogenetic abnormalities. We conclude that hypoplasia of cerebellar vermal lobules VI and VII is a nonspecific finding that even occurs in several conditions without autistic behavior. This suggests that it is not a specific neuroanatomical marker for autism, nor is cerebellar dys- genesis likely to be solely responsible for clinical autistic behaviors. 相似文献
8.
9.
10.