Polarization oscillating beams(POB),characterized by variable local polarization states during propagation that are independent of birefringence or nonlinear effects,present a unique platform for light-matter interact...Polarization oscillating beams(POB),characterized by variable local polarization states during propagation that are independent of birefringence or nonlinear effects,present a unique platform for light-matter interactions.However,previous studies have been constrained by a beam superposition framework that identifies scalar beams as orthogonal polarization bases,restricting their extension to accelerating beams.Here,we propose a new framework for constructing POB,where the phase,amplitude,and polarization correspondences between the state-space representation and the real-space dynamics are explored.According to unified rules,concurrent and arbitrary controls of the trajectory,intensity,and polarization state along the optical path of caustic beams are realized.This will expand the theoretical and practical value of POB in classical entanglement,nontrivial optical forces,chirality detection,and other related domains,while potentially offering insights into the multidimensional manipulation of vector fields.展开更多
The rhizosphere bacterium Pseudomonas protegens FD6,which is associated with the production of antibiotics such as pyoluteorin(PLT)and 2,4-diacetylphloroglucinol(2,4-DAPG),has strong antagonistic effects on phytopatho...The rhizosphere bacterium Pseudomonas protegens FD6,which is associated with the production of antibiotics such as pyoluteorin(PLT)and 2,4-diacetylphloroglucinol(2,4-DAPG),has strong antagonistic effects on phytopathogens.Hfq is a conserved RNA chaperone involved in the regulation of stress tolerance,antibiotic production,and bacterial virulence.Here,we determined the regulatory effects of Hfq on biocontrol traits in P.protegens FD6.Mutation of hfq in FD6 reduced the growth rate,swimming and swarming ability,and production of proteases,siderophores,and hydrogen cyanide(HCN).Transmission electron microscopy revealed that disruption of hfq led to the loss of flagella.Furthermore,Hfq exerted a suppressive effect on biofilm formation and PLT production while not affecting antagonistic activity and control effect against tomato bacterial wilt.However,Hfq positively regulated the production of 2,4-DAPG and activated the phlD expression.Additionally,mutation of hfq abolished the function of the type VI secretion system(T6SS)due to a decrease in the expression of T6SS-related genes.Overall,these results suggest that Hfq plays a pleiotropic role in modulating the expression of biocontrol trait-related genes in P.protegens FD6.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12474299,and 12174338).
文摘Polarization oscillating beams(POB),characterized by variable local polarization states during propagation that are independent of birefringence or nonlinear effects,present a unique platform for light-matter interactions.However,previous studies have been constrained by a beam superposition framework that identifies scalar beams as orthogonal polarization bases,restricting their extension to accelerating beams.Here,we propose a new framework for constructing POB,where the phase,amplitude,and polarization correspondences between the state-space representation and the real-space dynamics are explored.According to unified rules,concurrent and arbitrary controls of the trajectory,intensity,and polarization state along the optical path of caustic beams are realized.This will expand the theoretical and practical value of POB in classical entanglement,nontrivial optical forces,chirality detection,and other related domains,while potentially offering insights into the multidimensional manipulation of vector fields.
基金supported by funds from the National Natural Science Foundation(32472628,32072471)the Science and Technology Program of Yangzhou City(YZ2023056)+1 种基金the Guangxi Key Laboratory of Agro-Environment and Agro-Product Safety Open Projects Fund(GKLAEAPS2023-04)the Jiangsu Province College Students Innovation and Entrepreneurship Training Program(2023117021Z).
文摘The rhizosphere bacterium Pseudomonas protegens FD6,which is associated with the production of antibiotics such as pyoluteorin(PLT)and 2,4-diacetylphloroglucinol(2,4-DAPG),has strong antagonistic effects on phytopathogens.Hfq is a conserved RNA chaperone involved in the regulation of stress tolerance,antibiotic production,and bacterial virulence.Here,we determined the regulatory effects of Hfq on biocontrol traits in P.protegens FD6.Mutation of hfq in FD6 reduced the growth rate,swimming and swarming ability,and production of proteases,siderophores,and hydrogen cyanide(HCN).Transmission electron microscopy revealed that disruption of hfq led to the loss of flagella.Furthermore,Hfq exerted a suppressive effect on biofilm formation and PLT production while not affecting antagonistic activity and control effect against tomato bacterial wilt.However,Hfq positively regulated the production of 2,4-DAPG and activated the phlD expression.Additionally,mutation of hfq abolished the function of the type VI secretion system(T6SS)due to a decrease in the expression of T6SS-related genes.Overall,these results suggest that Hfq plays a pleiotropic role in modulating the expression of biocontrol trait-related genes in P.protegens FD6.
