The occurrence regularity of Phyllocnistis citreua in northern Guizhou was investigated,and the relationship between summer shoot controlling of citrus and occurrence of P. citreua was studied. The results showed that...The occurrence regularity of Phyllocnistis citreua in northern Guizhou was investigated,and the relationship between summer shoot controlling of citrus and occurrence of P. citreua was studied. The results showed that P. citreua occurred from May to September every year in northern Guizhou,and the occurrence reached the peak from early May to late June and from early July to late August. The occurrence in early and mid July was the most serious. The free-sprouting time had a close relationship with occurrence quantity and damage level of P. citreua. The earlier the free-sprouting time was,the greater the occurrence quantity and damage level of P. citreua was. The integrated control techniques focused on timely erasing summer shoots and controlling shoots were suggested to use in production,in order to control the occurrence of P. citreua.展开更多
The water adsorption by shale significantly affects shale gas content and its seepage capacity.However,the mechanism of water adsorption by shale is still unclear due to its strong heterogeneity and complicated pore s...The water adsorption by shale significantly affects shale gas content and its seepage capacity.However,the mechanism of water adsorption by shale is still unclear due to its strong heterogeneity and complicated pore structure.The relationship between the adsorbed water content at different relative humidities(RHs)and shale compositions,as well as shale pore structure and the spatial configuration relationship between organic matter(OM)and clay minerals,was investigated to clarify the controlling factors and mechanisms of water adsorption by Longmaxi Formation shale from the Southern Sichuan Basin in China.Consequently,the water adsorption process could be generally divided into three different stages from 0%RH to 99%RH.Furthermore,the Johnston’s clay mine ral interlayer pore structure model(JCM),the Freundlich model(FM)and the Dubinin-Astakhov model(DAM)were tested to fit the three water adsorption stages from low RH to high RH,respectively.The fitting results of the JCM and FM at lower RHs were far from good,while the fitting results of DAM at higher RHs were acceptable.Accordingly,two revised models(LRHM and MRHM)considering the spatial configuration relationship between OM and clay minerals were proposed for the two stages with lower RHs,and performed better fitting results indicating the pronounced effect of the spatial configuration relationship between OM and clay minerals on the water adsorption process of Longmaxi Formation shale.The outcomes of this study will contribute to clarifying the water distribution characteristics in the pore network of shale samples with variable water contents.展开更多
Background:To understand the mitochondrial genome of the Crocidura fuliginosa in Dali region and to explore its systematic relationship with other species within the same genus.Methods:Employing high-throughput sequen...Background:To understand the mitochondrial genome of the Crocidura fuliginosa in Dali region and to explore its systematic relationship with other species within the same genus.Methods:Employing high-throughput sequencing technology in conjunction with bioinformatics software,to sequence and analyze the mitochondrial genome of this species.Utilizing complete mitochondrial genome data,the phylogenetic tree was constructed to illustrate the relationships among this species and other members of the genus.Results:Employing high-throughput sequencing technology in conjunction with bioinformatics software,to sequence and analyze the mitochondrial genome of this species.Utilizing complete mitochondrial genome data,the phylogenetic tree was constructed to illustrate the relationships among this species and other members of the genus.The results indicated that the mitochondrial genome length was 17,224 bp,and encoded 37 genes,exhibiting a significant AT bias.With the exception of the trnS1 gene,all other tRNA genes can fold into a standard clover structure,while the base composition of rRNA genes followed the order of A>T>C>G.All PCGs were stared by ATN,with the majority terminating in TAA or TAG,except for the cob gene.The codon with the highest RSCU was UUA,while the lowest was CCG.The phylogenetic relationship of C.fuliginosa with(((((C.anhuiensis,C.attenuata),C.lasiura),C.dongyangjiangensis),C.tanakae),C.sp.g ZL)had recently received strong support.Conclusion:Therefore,this study expands the mitochondrial genomics database for Crocidura,providing a solid foundation for future in-depth exploration of the classification,phylogenetic relationships,and evolution of this genus and its related species.展开更多
文摘The occurrence regularity of Phyllocnistis citreua in northern Guizhou was investigated,and the relationship between summer shoot controlling of citrus and occurrence of P. citreua was studied. The results showed that P. citreua occurred from May to September every year in northern Guizhou,and the occurrence reached the peak from early May to late June and from early July to late August. The occurrence in early and mid July was the most serious. The free-sprouting time had a close relationship with occurrence quantity and damage level of P. citreua. The earlier the free-sprouting time was,the greater the occurrence quantity and damage level of P. citreua was. The integrated control techniques focused on timely erasing summer shoots and controlling shoots were suggested to use in production,in order to control the occurrence of P. citreua.
基金supported by the National Natural Science Foundation of China(No.41972145)National Science and Technology Major Project of China(No.2017ZX05035—002)+1 种基金the Foundation(No.PRP/indep-2-1904,PRP/indep-3-1707 and No.PRP/indep-3-1615)of State Key Laboratory of Petroleum Resources and Prospecting from China University of Petroleum in Beijingfundamental Research Funds for China University of Geosciences under Award Number 35832019035。
文摘The water adsorption by shale significantly affects shale gas content and its seepage capacity.However,the mechanism of water adsorption by shale is still unclear due to its strong heterogeneity and complicated pore structure.The relationship between the adsorbed water content at different relative humidities(RHs)and shale compositions,as well as shale pore structure and the spatial configuration relationship between organic matter(OM)and clay minerals,was investigated to clarify the controlling factors and mechanisms of water adsorption by Longmaxi Formation shale from the Southern Sichuan Basin in China.Consequently,the water adsorption process could be generally divided into three different stages from 0%RH to 99%RH.Furthermore,the Johnston’s clay mine ral interlayer pore structure model(JCM),the Freundlich model(FM)and the Dubinin-Astakhov model(DAM)were tested to fit the three water adsorption stages from low RH to high RH,respectively.The fitting results of the JCM and FM at lower RHs were far from good,while the fitting results of DAM at higher RHs were acceptable.Accordingly,two revised models(LRHM and MRHM)considering the spatial configuration relationship between OM and clay minerals were proposed for the two stages with lower RHs,and performed better fitting results indicating the pronounced effect of the spatial configuration relationship between OM and clay minerals on the water adsorption process of Longmaxi Formation shale.The outcomes of this study will contribute to clarifying the water distribution characteristics in the pore network of shale samples with variable water contents.
文摘Background:To understand the mitochondrial genome of the Crocidura fuliginosa in Dali region and to explore its systematic relationship with other species within the same genus.Methods:Employing high-throughput sequencing technology in conjunction with bioinformatics software,to sequence and analyze the mitochondrial genome of this species.Utilizing complete mitochondrial genome data,the phylogenetic tree was constructed to illustrate the relationships among this species and other members of the genus.Results:Employing high-throughput sequencing technology in conjunction with bioinformatics software,to sequence and analyze the mitochondrial genome of this species.Utilizing complete mitochondrial genome data,the phylogenetic tree was constructed to illustrate the relationships among this species and other members of the genus.The results indicated that the mitochondrial genome length was 17,224 bp,and encoded 37 genes,exhibiting a significant AT bias.With the exception of the trnS1 gene,all other tRNA genes can fold into a standard clover structure,while the base composition of rRNA genes followed the order of A>T>C>G.All PCGs were stared by ATN,with the majority terminating in TAA or TAG,except for the cob gene.The codon with the highest RSCU was UUA,while the lowest was CCG.The phylogenetic relationship of C.fuliginosa with(((((C.anhuiensis,C.attenuata),C.lasiura),C.dongyangjiangensis),C.tanakae),C.sp.g ZL)had recently received strong support.Conclusion:Therefore,this study expands the mitochondrial genomics database for Crocidura,providing a solid foundation for future in-depth exploration of the classification,phylogenetic relationships,and evolution of this genus and its related species.
