全文获取类型
收费全文 | 381924篇 |
免费 | 25049篇 |
国内免费 | 2808篇 |
专业分类
耳鼻咽喉 | 5210篇 |
儿科学 | 8271篇 |
妇产科学 | 10110篇 |
基础医学 | 53582篇 |
口腔科学 | 11853篇 |
临床医学 | 30282篇 |
内科学 | 78961篇 |
皮肤病学 | 8643篇 |
神经病学 | 27686篇 |
特种医学 | 14080篇 |
外国民族医学 | 82篇 |
外科学 | 61076篇 |
综合类 | 9963篇 |
现状与发展 | 1篇 |
一般理论 | 64篇 |
预防医学 | 17621篇 |
眼科学 | 9605篇 |
药学 | 31263篇 |
1篇 | |
中国医学 | 2202篇 |
肿瘤学 | 29225篇 |
出版年
2021年 | 2679篇 |
2019年 | 2781篇 |
2018年 | 4617篇 |
2017年 | 3486篇 |
2016年 | 3622篇 |
2015年 | 4106篇 |
2014年 | 5801篇 |
2013年 | 7496篇 |
2012年 | 10221篇 |
2011年 | 10421篇 |
2010年 | 6319篇 |
2009年 | 5939篇 |
2008年 | 9634篇 |
2007年 | 10476篇 |
2006年 | 10387篇 |
2005年 | 9422篇 |
2004年 | 8932篇 |
2003年 | 8648篇 |
2002年 | 8346篇 |
2001年 | 28361篇 |
2000年 | 28889篇 |
1999年 | 23767篇 |
1998年 | 5220篇 |
1997年 | 4288篇 |
1996年 | 3862篇 |
1995年 | 3510篇 |
1994年 | 3133篇 |
1993年 | 2871篇 |
1992年 | 16121篇 |
1991年 | 14874篇 |
1990年 | 14205篇 |
1989年 | 14013篇 |
1988年 | 12631篇 |
1987年 | 12109篇 |
1986年 | 11140篇 |
1985年 | 10367篇 |
1984年 | 6939篇 |
1983年 | 5620篇 |
1982年 | 2740篇 |
1979年 | 5505篇 |
1978年 | 3370篇 |
1977年 | 2985篇 |
1975年 | 2659篇 |
1974年 | 3084篇 |
1973年 | 2884篇 |
1972年 | 2841篇 |
1971年 | 2789篇 |
1970年 | 2534篇 |
1969年 | 2564篇 |
1968年 | 2261篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
51.
52.
53.
N. V. Bashmakova G. N. Chistiakova I. A. Gazieva Y. M. Trapeznikova D. O. Mazurov 《Gynecological endocrinology》2015,31(10):31-33
AbstractThis study was undertaken to compare the concentrations of pro- and anti-angiogenic growth factors, nitric oxide (NO) stable metabolites in maternal serum and embryonic left ventricular (LV) isovolumic relaxation time (IRT, ms) during the first trimester in two groups of women: with pregnancy conceived by assisted reproductive technologies (ART, n?=?39) and normally conceived (control group, n?=?68) pregnancy. The concentration of vasoconstrictor endothelin 1 was 45.5 times more in ART than in control group. On the contrary, the concentrations of NO stable metabolites in ART were 1.9 times less than in control women. The assessment of angiogenic suppressors in ART women demonstrates the decrease in s-endoglin concentration was 1.6 times and in soluble receptor to vascular endothelial growth factor concentration was 2.0 times in comparison with control group. There was a significant increase in LV IRT in ART embryos in comparison to control ones. These data suggest significant changes in pro- anti-angiogenic factors balance and increase in vascular impedance in ART-conceived embryos. 相似文献
54.
55.
Taichi Goto Gojiro Nakagami Takeo Minematsu Sanai Tomida Masamichi Shinoda Koichi Iwata Hiromi Sanada 《Experimental dermatology》2019,28(9):1010-1016
Cutaneous wound pain causes physical and psychological stress for patients with wounds. Previous studies reported that stress induces hyperalgesia and deteriorates wound healing. However, the effect of the stress response such as in hypothalamic‐pituitary‐adrenal (HPA) axis on local wound area is unclear. We aimed to investigate the effects of a stress response on the mechanical withdrawal threshold in the local wound area and describe the identification of a wound pain exacerbation. We topically injected adrenocorticotropic hormone (ACTH) into the granulation tissue of full‐thickness cutaneous wound model rats on the fifth day postwounding and measured the mechanical withdrawal thresholds, cytochrome P450 2Bs levels and concentration of 5,6‐epoxyeicosatrienoic acid in wound exudate. We found that ACTH induced mechanical hypersensitivity at 4 and 6 hours after injection (P = .004 and .021, respectively), and increased gene expression of cytochrome P450 2B12 expression (P = .046). Concentration of 5,6‐EET in the wound exudate was moderately correlated with the mechanical withdrawal threshold (r = ?.630). Finally, the mechanical withdrawal threshold in the 5,6‐EET group was significantly lower than that in the control group at 2 hours after the injection (P = .015). We propose that 5,6‐EET is one of the most promising contributors to the wound pain exacerbation. These findings could guide clinical wound and pain management. 相似文献
56.
Umar Nadia K. Badshah Maaz B. Sandrasegaran Kumar Ghabril Marwan Agarwal Saurabh Tann Mark Lacerda Marco Kwo Paul Y. 《Digestive diseases and sciences》2015,60(7):2196-2200
Digestive Diseases and Sciences - To determine whether the presence of portal vein thrombosis (PVT) where venous flow within the liver may be altered may delay the diagnosis of HCC and be... 相似文献
57.
58.
Irmak Karaca Suzan Güven Yılmaz Melis Palamar Halil Ateş 《Ocular immunology and inflammation》2020,28(6):947-951
ABSTRACT
Purpose
To investigate the effect of 1% tropicamide on anterior chamber aqueous flare (ACAF) measurements acquired with laser flare meter in patients with pseudoexfoliation. 相似文献59.
60.
Toneva Diana H. Nikolova Silviya Y. Tasheva-Terzieva Elena D. Zlatareva Dora K. Lazarov Nikolai E. 《International journal of legal medicine》2022,136(6):1851-1863
International Journal of Legal Medicine - Sex identification is a primary step in forensic analysis of skeletal remains. The accuracy of sex estimation methods greatly depends on the sexual... 相似文献