在经典目标识别理论中,哺乳动物的视网膜和LGN中许多神经元执行了DoG (Difference of Gaussian)操作,其功能一般认为是白化,祛除冗余,并增强了边缘。通过对鸽视顶盖的ON-OFF神经元进行电生理研究,发现其利用FSL(First-SpikeLatency)进...在经典目标识别理论中,哺乳动物的视网膜和LGN中许多神经元执行了DoG (Difference of Gaussian)操作,其功能一般认为是白化,祛除冗余,并增强了边缘。通过对鸽视顶盖的ON-OFF神经元进行电生理研究,发现其利用FSL(First-SpikeLatency)进行场景整体信息粗略快速的传递,利用发放率对场景中显著性特征进行相续的传递。通过解析神经元响应模式,提出了OT(Optic Tectum)的ON-OFF神经元工作机制的一种假设,搭建了模型架构。该研究对新型的Spike神经网络的研究具有一定的借鉴意义。展开更多
The spike gene(S)of Infectious bronchitis virus(IBV)CK/CH/LDL97Ⅰ/97 isolate was amplified,cloned,sequenced and analyzed.Results showed that the S gene was 3501 bp encoding a polypeptide of 1167 amino acids.The precur...The spike gene(S)of Infectious bronchitis virus(IBV)CK/CH/LDL97Ⅰ/97 isolate was amplified,cloned,sequenced and analyzed.Results showed that the S gene was 3501 bp encoding a polypeptide of 1167 amino acids.The precursor of the S protein was cleaved into S1 and S2 fragments,which comprised 541 and 626 amino acid residues,respectively.The cleavage site sequence was RRTGR.The homologies of nucleotide and amino acid sequences of S1 gene between CK/CH/LDL97 Ⅰ/97 and 27 reference IBV strains ranged from 60.6% to 99.6%,and 50.5% to 99.1%,respectively.The CK/CH/LDL97Ⅰ/97 S1 was most similar to that of three proventriculus IBV isolates,Q1(99.1%),J2(98.9%),T3(98.9%),which were isolated in China.Phylogenetic analysis of S1 proteins indicated that CK/CH/LDL97Ⅰ/97,Q1,J2 and T3 formed a separated cluster,which might belong to a novel genotype of IBV.展开更多
文摘在经典目标识别理论中,哺乳动物的视网膜和LGN中许多神经元执行了DoG (Difference of Gaussian)操作,其功能一般认为是白化,祛除冗余,并增强了边缘。通过对鸽视顶盖的ON-OFF神经元进行电生理研究,发现其利用FSL(First-SpikeLatency)进行场景整体信息粗略快速的传递,利用发放率对场景中显著性特征进行相续的传递。通过解析神经元响应模式,提出了OT(Optic Tectum)的ON-OFF神经元工作机制的一种假设,搭建了模型架构。该研究对新型的Spike神经网络的研究具有一定的借鉴意义。
文摘The spike gene(S)of Infectious bronchitis virus(IBV)CK/CH/LDL97Ⅰ/97 isolate was amplified,cloned,sequenced and analyzed.Results showed that the S gene was 3501 bp encoding a polypeptide of 1167 amino acids.The precursor of the S protein was cleaved into S1 and S2 fragments,which comprised 541 and 626 amino acid residues,respectively.The cleavage site sequence was RRTGR.The homologies of nucleotide and amino acid sequences of S1 gene between CK/CH/LDL97 Ⅰ/97 and 27 reference IBV strains ranged from 60.6% to 99.6%,and 50.5% to 99.1%,respectively.The CK/CH/LDL97Ⅰ/97 S1 was most similar to that of three proventriculus IBV isolates,Q1(99.1%),J2(98.9%),T3(98.9%),which were isolated in China.Phylogenetic analysis of S1 proteins indicated that CK/CH/LDL97Ⅰ/97,Q1,J2 and T3 formed a separated cluster,which might belong to a novel genotype of IBV.
