Research on discrete memristor-based neural networks has received much attention.However,current research mainly focuses on memristor–based discrete homogeneous neuron networks,while memristor-coupled discrete hetero...Research on discrete memristor-based neural networks has received much attention.However,current research mainly focuses on memristor–based discrete homogeneous neuron networks,while memristor-coupled discrete heterogeneous neuron networks are rarely reported.In this study,a new four-stable discrete locally active memristor is proposed and its nonvolatile and locally active properties are verified by its power-off plot and DC V–I diagram.Based on two-dimensional(2D)discrete Izhikevich neuron and 2D discrete Chialvo neuron,a heterogeneous discrete neuron network is constructed by using the proposed discrete memristor as a coupling synapse connecting the two heterogeneous neurons.Considering the coupling strength as the control parameter,chaotic firing,periodic firing,and hyperchaotic firing patterns are revealed.In particular,multiple coexisting firing patterns are observed,which are induced by different initial values of the memristor.Phase synchronization between the two heterogeneous neurons is discussed and it is found that they can achieve perfect synchronous at large coupling strength.Furthermore,the effect of Gaussian white noise on synchronization behaviors is also explored.We demonstrate that the presence of noise not only leads to the transition of firing patterns,but also achieves the phase synchronization between two heterogeneous neurons under low coupling strength.展开更多
Using synthetic microbial communities to promote host growth is an effective approach.However,the construction of such communities lacks theoretical guidance.Kin discrimination is an effective means by which strains c...Using synthetic microbial communities to promote host growth is an effective approach.However,the construction of such communities lacks theoretical guidance.Kin discrimination is an effective means by which strains can recognize themselves from non-self,and construct competitive microbial communities to produce more secondary metabolites.However,the construction of cooperative communities benefits from the widespread use of beneficial microorganisms.We used kin discrimination to construct synthetic communities(SCs)comprising 13 Bacillus subtilis strains from the surface and gut of black soldier fly(BSF)larvae.We assessed larval growth promotion in a pigeon manure system and found that the synthetic community comprising 4 strains(SC 4)had the most profound effect.Genomic analyses of these 4 strains revealed that their complementary functional genes underpinned the robust functionality of the cooperative synthetic community,highlighting the importance of strain diversity.After analyzing the bacterial composition of BSF larvae and the pigeon manure substrate,we observed that SC 4 altered the bacterial abundance in both the larval gut and pigeon manure.This also influenced microbial metabolic functions and co-occurrence network complexity.Kin discrimination facilitates the rapid construction of synthetic communities.The positive effects of SC 4 on larval weight gain resulted from the functional redundancy and complementarity among the strains.Furthermore,SC 4 may enhance larval growth by inducing shifts in the bacterial composition of the larval gut and pigeon manure.This elucidated how the SC promoted larval growth by regulating bacterial composition and provided theoretical guidance for the construction of SCs.展开更多
基金Project supported by the National Natural Science Foundations of China(Grant Nos.62171401 and 62071411).
文摘Research on discrete memristor-based neural networks has received much attention.However,current research mainly focuses on memristor–based discrete homogeneous neuron networks,while memristor-coupled discrete heterogeneous neuron networks are rarely reported.In this study,a new four-stable discrete locally active memristor is proposed and its nonvolatile and locally active properties are verified by its power-off plot and DC V–I diagram.Based on two-dimensional(2D)discrete Izhikevich neuron and 2D discrete Chialvo neuron,a heterogeneous discrete neuron network is constructed by using the proposed discrete memristor as a coupling synapse connecting the two heterogeneous neurons.Considering the coupling strength as the control parameter,chaotic firing,periodic firing,and hyperchaotic firing patterns are revealed.In particular,multiple coexisting firing patterns are observed,which are induced by different initial values of the memristor.Phase synchronization between the two heterogeneous neurons is discussed and it is found that they can achieve perfect synchronous at large coupling strength.Furthermore,the effect of Gaussian white noise on synchronization behaviors is also explored.We demonstrate that the presence of noise not only leads to the transition of firing patterns,but also achieves the phase synchronization between two heterogeneous neurons under low coupling strength.
基金supported by the Key-Area Research and Development Program of Guangdong Province(2020B0202080002).
文摘Using synthetic microbial communities to promote host growth is an effective approach.However,the construction of such communities lacks theoretical guidance.Kin discrimination is an effective means by which strains can recognize themselves from non-self,and construct competitive microbial communities to produce more secondary metabolites.However,the construction of cooperative communities benefits from the widespread use of beneficial microorganisms.We used kin discrimination to construct synthetic communities(SCs)comprising 13 Bacillus subtilis strains from the surface and gut of black soldier fly(BSF)larvae.We assessed larval growth promotion in a pigeon manure system and found that the synthetic community comprising 4 strains(SC 4)had the most profound effect.Genomic analyses of these 4 strains revealed that their complementary functional genes underpinned the robust functionality of the cooperative synthetic community,highlighting the importance of strain diversity.After analyzing the bacterial composition of BSF larvae and the pigeon manure substrate,we observed that SC 4 altered the bacterial abundance in both the larval gut and pigeon manure.This also influenced microbial metabolic functions and co-occurrence network complexity.Kin discrimination facilitates the rapid construction of synthetic communities.The positive effects of SC 4 on larval weight gain resulted from the functional redundancy and complementarity among the strains.Furthermore,SC 4 may enhance larval growth by inducing shifts in the bacterial composition of the larval gut and pigeon manure.This elucidated how the SC promoted larval growth by regulating bacterial composition and provided theoretical guidance for the construction of SCs.
