全文获取类型
收费全文 | 71篇 |
免费 | 2篇 |
专业分类
林业 | 4篇 |
农学 | 2篇 |
26篇 | |
综合类 | 7篇 |
农作物 | 6篇 |
水产渔业 | 5篇 |
畜牧兽医 | 14篇 |
植物保护 | 9篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 1篇 |
2019年 | 1篇 |
2016年 | 1篇 |
2014年 | 3篇 |
2013年 | 3篇 |
2012年 | 2篇 |
2011年 | 7篇 |
2010年 | 2篇 |
2009年 | 1篇 |
2008年 | 6篇 |
2007年 | 9篇 |
2006年 | 3篇 |
2005年 | 4篇 |
2004年 | 5篇 |
2003年 | 2篇 |
2002年 | 8篇 |
2001年 | 1篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1994年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有73条查询结果,搜索用时 0 毫秒
71.
Host immune system gene targeting by a viral miRNA 总被引:1,自引:0,他引:1
Stern-Ginossar N Elefant N Zimmermann A Wolf DG Saleh N Biton M Horwitz E Prokocimer Z Prichard M Hahn G Goldman-Wohl D Greenfield C Yagel S Hengel H Altuvia Y Margalit H Mandelboim O 《Science (New York, N.Y.)》2007,317(5836):376-381
Virally encoded microRNAs (miRNAs) have recently been discovered in herpesviruses. However, their biological roles are mostly unknown. We developed an algorithm for the prediction of miRNA targets and applied it to human cytomegalovirus miRNAs, resulting in the identification of the major histocompatibility complex class I-related chain B (MICB) gene as a top candidate target of hcmv-miR-UL112. MICB is a stress-induced ligand of the natural killer (NK) cell activating receptor NKG2D and is critical for the NK cell killing of virus-infected cells and tumor cells. We show that hcmv-miR-UL112 specifically down-regulates MICB expression during viral infection, leading to decreased binding of NKG2D and reduced killing by NK cells. Our results reveal a miRNA-based immunoevasion mechanism that appears to be exploited by human cytomegalovirus. 相似文献
72.
Büttner T Geier J Frison G Harmer J Calle C Schweiger A Schönberg H Grützmacher H 《Science (New York, N.Y.)》2005,307(5707):235-238
Metal-stabilized phenoxyl radicals appear to be important intermediates in a variety of enzymatic oxidations. We report that transition metal coordination also supports an aminyl radical, resulting in a stable crystalline complex: [Rh(I)(trop2N.)(bipy)]+OTf- (where trop is 5-H-dibenzo[a,d]cycloheptene-5-yl, bipy is 2,2'-bipyridyl, OTf- is trifluorosulfonate). It is accessible under mild conditions by one-electron oxidation of the amide complex [Rh(I)(trop2N)(bipy)], at a potential of -0.55 volt versus ferrocene/ferrocenium. Both electron paramagnetic resonance spectroscopy and density functional theory support 57% localization of the unpaired spin at N. In reactions with H-atom donors, the Rh-coordinated aminyl behaves as a nucleophilic radical. 相似文献
73.
Hongyan Zhang Ilona Schonhof Angelika Krumbein Bodo Gutezeit Long Li Hartmut Stützel Monika Schreiner 《植物养料与土壤学杂志》2008,171(2):255-265
The overall objective of this study was to determine whether growing season, water supply, and their interaction influence glucosinolate (GSL) concentration and composition in turnip roots (Brassica rapa ssp. rapifera L.). Field experiments on a loamy soil in Großbeeren, Germany, were conducted in the spring‐summer (SS), summer‐autumn (SA), and autumn‐winter (AW) growing seasons. Each experiment included three water‐supply treatments with 25%, 50%, and 75% of available soil water (ASW) as lower thresholds. We found that the total GSL concentration in turnip roots was 1774–3221 μmol (kg fresh matter [FM])–1 and the dominant GSL was aromatic gluconasturtiin (GST) with concentrations of 1004–1628 μmol (kg FM)–1 in turnip roots. Total, aliphatic, and some specific individual GSLs in turnip roots were significantly influenced by water supply, growing season, and their interaction, due to the variations of the root sulfur (S) concentration, climatic conditions, or both. The influence of water supply on GSL concentration was modified by growing season, which in turn influenced S concentration in turnips. In the SS season, the 25%‐ASW water treatment enhanced concentrations of total GSLs by 52% and 47%, aliphatic GSLs by 60% and 131%, and aromatic GSLs by 47% and 21% when compared to the 50%‐ and 75%‐ASW water treatments, respectively. No reduction of root yield was observed, although the shoot yield was reduced by limited water supply. In SA and AW, total GSL concentration did not change under different water‐supply levels, but concentration of individual aliphatic and indole GSLs did. Based on these results, growers can adjust their irrigation and S‐fertilization practices to growing season in order to optimize turnip quality in terms of GSL concentration and composition, while still obtaining higher root yield and enabling better resource utilization. 相似文献