Conotoxin(CTX)is a small peptide toxin,and plays crucial role in anesthetizes prey,preys and defends competitors.Charonia tritonis is the natural predator of the crown of thorns starfish(CoTS)and the protector of cora...Conotoxin(CTX)is a small peptide toxin,and plays crucial role in anesthetizes prey,preys and defends competitors.Charonia tritonis is the natural predator of the crown of thorns starfish(CoTS)and the protector of coral reefs.It plays an important role in the coral reef ecosystem.However,the types of toxins produced by tritons and the molecular mechanisms of toxin secretion of C.tritonis are unknown.In the present study,the four conotoxin homologous genes(CTXs)from C.tritonis were identified.Species and conotoxin superfamily phylogenetic tree indicated that CTX-1(CL2216.Contig2)and CTX-4(Unigene 58438_All)belong to the C superfamily,CTX-2(Unigene 66414_All)belong to the V superfamily,and CTX-3(Unigene 21408_All)belong to the B1 superfamily.CTXs were highly expressed in salivary gland,liver and digestive gland.The predation control experiment revealed that the expressions of CTXs were significantly different in salivary gland,liver and digestive gland.The results indicated that CTXs may participate in the process of C.tritonis predating CoTs,and provided a scientific basis for further studying the toxins secretion mechanism of C.tritonis.展开更多
提出了一种在晶体极化声子共振区利用级联差频在Mg O∶Li Nb O_(3)平板波导中产生高频太赫兹波的方法。不同于传统的基于两束近红外光直接差频产生太赫兹波,本文首先利用两束近红外光在周期极化铌酸锂(PPLN)晶体中产生低频太赫兹波和一...提出了一种在晶体极化声子共振区利用级联差频在Mg O∶Li Nb O_(3)平板波导中产生高频太赫兹波的方法。不同于传统的基于两束近红外光直接差频产生太赫兹波,本文首先利用两束近红外光在周期极化铌酸锂(PPLN)晶体中产生低频太赫兹波和一系列级联光,然后将上述级联光耦合导入平板波导中,通过改变平板波导的尺寸优化各阶差频的相位失配分布,经级联差频高效产生高频太赫兹波。借助Mg O∶Li Nb O_(3)晶体极化声子共振区巨大的非线性光学系数,以及Mg O∶Li Nb O_(3)平板波导中被降低的太赫兹波吸收系数,在室温下通过输入两束强度均为100 MW/cm^(2)的差频光,得到了频率为5 THz的高频太赫兹波,太赫兹波强度为88.2396 MW/cm^(2),能量转换效率为44.12%。本文为产生高频、高功率太赫兹波提供了一种全新方法,可以推动高频太赫兹波在未来高速无线通信领域的应用。展开更多
基金supported by the National Natural Science Foundation of China(No.42176129)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA13020206)+1 种基金the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(No.GML2019ZD0402)the Planning Project of Guangdong Province,China,Guangdong Provincial Key Laboratory of Applied Marine Biology(No.2020B1212060058).
文摘Conotoxin(CTX)is a small peptide toxin,and plays crucial role in anesthetizes prey,preys and defends competitors.Charonia tritonis is the natural predator of the crown of thorns starfish(CoTS)and the protector of coral reefs.It plays an important role in the coral reef ecosystem.However,the types of toxins produced by tritons and the molecular mechanisms of toxin secretion of C.tritonis are unknown.In the present study,the four conotoxin homologous genes(CTXs)from C.tritonis were identified.Species and conotoxin superfamily phylogenetic tree indicated that CTX-1(CL2216.Contig2)and CTX-4(Unigene 58438_All)belong to the C superfamily,CTX-2(Unigene 66414_All)belong to the V superfamily,and CTX-3(Unigene 21408_All)belong to the B1 superfamily.CTXs were highly expressed in salivary gland,liver and digestive gland.The predation control experiment revealed that the expressions of CTXs were significantly different in salivary gland,liver and digestive gland.The results indicated that CTXs may participate in the process of C.tritonis predating CoTs,and provided a scientific basis for further studying the toxins secretion mechanism of C.tritonis.
文摘为了优化在真核细胞中猪流行性腹泻病毒(PEDV)S蛋白的分泌表达,且构建稳定表达的细胞系,本研究设计合成了9个信号肽引物,通过同源重组的方式得到表达PEDV变异株AH2012/12株S全长蛋白的9个重组表达质粒,瞬时转染HEK 293T细胞后,通过Western-blot验证蛋白外分泌表达水平,结果显示,筛选出的含跨膜蛋白酶丝氨酸信号肽的S蛋白具有较好的外分泌表达特性;利用G418筛选,获得稳定表达PEDV S蛋白的单克隆细胞,通过传代验证不同代次的蛋白表达水平,成功构建了可稳定外分泌表达PEDV S的CHO细胞系。结果显示,可在100 m L CHO-PEDV/S细胞培养上清中获得约5 mg的PEDV S蛋白,提高了PEDV S蛋白的表达和分泌,为进一步研制PEDV亚单位疫苗奠定了基础。
文摘提出了一种在晶体极化声子共振区利用级联差频在Mg O∶Li Nb O_(3)平板波导中产生高频太赫兹波的方法。不同于传统的基于两束近红外光直接差频产生太赫兹波,本文首先利用两束近红外光在周期极化铌酸锂(PPLN)晶体中产生低频太赫兹波和一系列级联光,然后将上述级联光耦合导入平板波导中,通过改变平板波导的尺寸优化各阶差频的相位失配分布,经级联差频高效产生高频太赫兹波。借助Mg O∶Li Nb O_(3)晶体极化声子共振区巨大的非线性光学系数,以及Mg O∶Li Nb O_(3)平板波导中被降低的太赫兹波吸收系数,在室温下通过输入两束强度均为100 MW/cm^(2)的差频光,得到了频率为5 THz的高频太赫兹波,太赫兹波强度为88.2396 MW/cm^(2),能量转换效率为44.12%。本文为产生高频、高功率太赫兹波提供了一种全新方法,可以推动高频太赫兹波在未来高速无线通信领域的应用。