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Rhizosphere microbial communities associated to rose replant disease:links to plant growth and root metabolites

Horticulture Research 2020年第1期7卷 1031-1046页

作者： B.Yim A.Baumann G.Grunewaldt-Stöcker B.Liu L.Beerhues S.Zühlke m.sapp J.Nesme S.J.Sørensen K.Smalla T.Winkelmann Institute of Horticultural Production Systems Leibniz Universität Hannover30419 HannoverGermany Julius Kühn-Institut(JKI) Institute for Epidemiology and Pathogen Diagnostics38104 BraunschweigGermany Institute of Pharmaceutical Biology Technische Universität Braunschweig38106 BraunschweigGermany Faculty of Chemistry and Chemical Biology(CCB) Technische Universität Dortmund44227 DortmundGermany Cluster of Excellence on Plant Sciences(CEPLAS) Institute for Population GeneticsHeinrich Heine University40225 DüsseldorfGermany Section of microbiology Department of BiologyUniversity of Copenhagen2100 CopenhagenDenmark

Growth depression of Rosa plants at sites previously used to cultivate the same or closely related species is a typical symptom of rose replant disease(RRD).Currently,limited information is available on the causes and the etiology of RRD compared to apple replant disease(ARD).Thus,this study aimed at analyzing growth characteristics,root morphology,and root metabolites,as well as microbial communities in the rhizosphere of the susceptible rootstock Rosa corymbifera‘Laxa’grown in RRD-affected soil from two sites(Heidgraben and Sangerhausen),either untreated or disinfected byγ-*** a greenhouse bioassay,plants developed significantly more biomass in theγ-irradiated than in the untreated soils of both *** plant metabolites detected in ***‘Laxa’roots were site-and *** aloesin was recorded in significantly higher concentrations in untreated than inγ-irradiated soils from Heidgraben,the concentrations of phenylalanine were significantly lower in roots from untreated soil of both *** microbial communities of 8-week-old plants were studied by sequencing of 16S rRNA,ITS,and cox gene fragments amplified from total community *** by microscopic observations,sequences affiliated to the bacterial genus Streptomyces and the fungal genus Nectria were identified as potential causal agents of RRD in the soils *** relative abundance of oomycetes belonging to the genus Pythiogeton showed a negative correlation to the growth of the ***,the RRD symptoms,the effects of soil treatments on the composition of the rhizosphere microbial community revealed striking similarities to findings related to ARD.

关键词： soil roots plant

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碳-碳复合材料在CIT上的应用

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新型炭材料 1990年第4期6卷 70-71页

作者： J.W.sapp 梁涛

一、引言园环点火托卡马克(CIT,CompactIgnition Tokamak)核聚变装置目前正处于初步设计阶段。园环的尺寸和CIT的高性能特性导致内板界面表面的热流量高达约10mW/m^2。由于碳的原子序数较低,具有较高的抗热冲击性、以及在最新一代托卡... 详细信息

一、引言园环点火托卡马克(CIT,CompactIgnition Tokamak)核聚变装置目前正处于初步设计阶段。园环的尺寸和CIT的高性能特性导致内板界面表面的热流量高达约10mW/m^2。由于碳的原子序数较低,具有较高的抗热冲击性、以及在最新一代托卡马克反应堆上的应用,所以把碳基材料选为CIT的第一幕墙材料。能在1700℃以下维持等离子体保护层表面的要求,对特种碳基材料的选择具有很大影响。

关键词：碳-碳复合材料 CIT 核聚变装置

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重型颅脑创伤后脑室内脑脊液β-淀粉蛋白及其前体显著升高

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世界核心医学期刊文摘（神经病学分册） 2005年第1期1卷 14-15页

作者： Olsson A. Csajbok L. st m. 李锐 Inst. of Clin. Neuroscience Section Sahlgrenska Univ. Hosp./Mlndal SE 43180 Mndal Sweden

Severe traumatic brain injury (TBI) may result in widespread damage to axons, termed diffuse axonal injury. Alzheimer’ s disease (AD) is characterised by synaptic and axonal degeneration together with senile plaques (SP). SP are mainly composed of aggregated β amyloid (Aβ ), which are peptides derived from the amyloid precursor protein (APP). Apart from TBI in itself being considered a risk factor for AD, severe head injury seems to initiate a cascade of molecular events that are also associated with AD. We have therefore analysed the 42 amino acid forms of Aβ (Aβ (1- 42)) and two soluble forms of APP (α sapp and β sapp) in ventricular cerebrospinal fluid (VCSF) andAβ (1 42) in plasma from 28 patients in a serial samples 0 11 days after TBI. The levels of α sapp, β sapp and Aβ (1- 42) were determined using ELISA assays. After TBI, there was a signi ficant stepwise increase in VCSF Aβ (1- 42) up to 1173 % from day 0- 1 to day 5 6and inVCSF α sapp up to 2033% increase from day 0 1 to day 7- 11. There was also a slight but significant increase of VCSF β sapp from day 0- 1 to day 5- 6 and day 7- 11. By contrast, the plasma Aβ (1- 42) level is unchanged after injury. The marked increase in VCSF Aβ (1- 42) implies that increased Aβ expression may occur as a secondary phenomenon after TBI with axonal damage. The unchanged level of plasma Aβ (1- 42) in contrast to the marked increase in VCSF Aβ (1- 42) after severe TBI, supports the suggestion that plasma Aβ (1- 42) does not reflect Aβ metabolism in the central nervous system (CNS).

关键词：重型颅脑创伤淀粉蛋白脑室内弥漫性轴索损伤轴突变性中枢神经系统级联反应神经元突触分子事件可溶性成分

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