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Propagation Control of Soliton Trains in Dispersion-Shifted Fibres in the Presence of Third-Order Dispersion

Chinese Physics Letters 2005年第6期22卷 1429-1432页

作者：崔虎徐文成罗爱平刘颂豪 InstituteofQuantumElectronics SouthChinaNormalUniversityGuangzhou510631

The evolution of soliton trains in dispersion-shifted fibres (dsfs) in the presence of third-order dispersion (TOD) is investigated. The results show that the collision of neighbouring solitons in the trains can be suppressed by means of a proper TOD, but the maximum transmission distance (or bandwidth) is limited by the increasing soliton separation that results from the TOD. It is also shown that the separation can be suppressed by adjusting the initial phase or amplitude difference between the solitons. These results are helpful to re-establish the potential application of the soliton-based optical-communication systems in dsfs.

关键词： SMFs dsfs TOD

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A predatory soil bacterium reprograms a quorum sensing signal system to regulate antifungal weapon production in a cyclic-di-GMP-independent manner

A predatory soil bacterium reprograms a quorum sensing signa...

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中国植物病理学会2021年学术年会

作者：李开怀 XU Gaoge WANG Bo WU Guichun HOU Rongxian 刘凤权 College of Plant Protection Nanjing Agricultural University Institute of Plant Protection Jiangsu Academy of Agricultural Sciences

Soil bacteria often provide multiple weapons to use against eukaryotes or prokaryotes *** signal factors（dsfs） represent a unique group of quorumsensing（QS） chemicals that modulate interspecies competition inbacteriathat do not produce antibiotic-like ***,themolecular mechanism by which DSF-mediated QS systems regulate weapons production for interspecies competition remains largely unknown in soil biocontrol *** this study,we found that the necessary QS system component protein RpfG from Lysobacter,in addition to being a cyclic dimeric GMP（c-di-GMP） phosphodiesterase（PDE）,regulates the biosynthesis of an antifungal weapon（heatstable antifungal factor,HSAF）,which does not appear to depend on the enzymatic ***,we showed for the first time that RpfG interacts with three hybrid two-component system（HyTCS） proteins,HtsHl,HtsH2,and HtsH3,to regulate HSAF production in *** vitro studies showed that each of these proteins interacted with RpfG,which reduced the PDE activity of ***,we showed that the cytoplasmic proportions of these proteins depended on their phosphorylation activity andbinding tothe promoter controlling the genes implicated in HSAF *** findings reveal apreviously uncharacterized mechanism of DSF signalling in antifungal weapon production in soilbacteria.

关键词： dsfs PDE HyTCS Quorum sensing signal system

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