[Objectives]This study was conducted to study the chemical constituents from Laportea bulbifera. [Methods] The 60% ethanol extract from L. bulbifera was isolated and purified by silica, Sephadex LH-20, ODS, semi-prepa...[Objectives]This study was conducted to study the chemical constituents from Laportea bulbifera. [Methods] The 60% ethanol extract from L. bulbifera was isolated and purified by silica, Sephadex LH-20, ODS, semi-preparative HPLC and recrystallization. Their chemical structures were elucidated by physicochemical properties and spectroscopic methods. [Results] These compounds were determined as kaempferol-3-O-α-L-(3-O-acetyl)-rhamnoside-7-O-α-L-rhamnoside(1), sutchuenoside A(2), kaempferol-3-O-[β-D-glucopyranosyl-(1→3)]-α-L-(4-O-acetyl)-rhamnopyranoside-7-O-α-L-rhamnopyranoside(3). Compounds 1-3 are isolated from genus Laportea for the first time. Compound 3 is a new compound. [Conclusions] This study lays a foundation for improving the quality standard of L. bulbifera and the development and utilization of its resources.展开更多
Background:The role of DNA analysis for ethnicity inferencing is a topic that attracts much interest from researchers in forensic identification,especially for identifying unknown bodies and trace evidence.So far,the ...Background:The role of DNA analysis for ethnicity inferencing is a topic that attracts much interest from researchers in forensic identification,especially for identifying unknown bodies and trace evidence.So far,the approaches considered effective for ethnic inferencing are autosomal single-nucleotide polymorphisms,Y-chromosome short-tandem repeats(STRs),and mitochondrial DNA haplotyping,which successfully demonstrates the association of specific nucleotides or patterns with population groups.Ethnic inferencing based on autosomal STRs is complex due to the nature of recombination in gamete formation.Aim:This study attempts to use clustering analysis to associate alleles and loci of autosomal STRs with population groups.Materials and Methods:We examined the allele frequency data from 19 STRs loci from the Malay Indonesian population(n=470)to compare with other populations,namely,Chinese Indonesian(n=133)and four reference populations(Malay Malaysian,Filipino,Chinese,and Caucasian).K-Medoids clustering analysis was carried out to pinpoint alleles and loci affecting the population clustering process.Results:The first stage of clustering results placed Malay Indonesians and four other Asian populations,namely,Chinese Indonesian,Malay Malaysian,Filipino,and Chinese,in Cluster 1,whereas the Caucasian group was in Cluster 2.It indicates that the CSF1PO,D5S818,and D8S1179 loci significantly distinguished the five Asian population groups from the Caucasian group,whereas D2S441,D8S1179,and D22S1045 were the three loci that significantly influenced the separation between Malay Indonesians and other groups.Conclusions:We conclude that K-medoids clustering analysis has the potential to play a role in ethnicity estimation by pinpointing specific STRs alleles.展开更多
This article is devoted to developing a recognition method of race and ethnicity of individual based on portrait photographs. The reference image is formed based on selected geometric points of the face and a special ...This article is devoted to developing a recognition method of race and ethnicity of individual based on portrait photographs. The reference image is formed based on selected geometric points of the face and a special algorithm for calculating the characteristic parameters of the images available in the database. Next, the original image is compared with the reference images of ethnic groups, and thus, the affiliation of the original image to a specific ethnic group is determined.展开更多
基金Supported by Guangxi University Scientific Research Project of Colleges and Universities in Guangxi (NO. YB2014192)Key R&D Program of Guangxi (GK AB19110027)High-level Innovation Team and Outstanding Scholar Program of Colleges and Universities in Guangxi:Basic and Clinical Innovation Team of Zhuang Medicine (GJR[2014]07)。
文摘[Objectives]This study was conducted to study the chemical constituents from Laportea bulbifera. [Methods] The 60% ethanol extract from L. bulbifera was isolated and purified by silica, Sephadex LH-20, ODS, semi-preparative HPLC and recrystallization. Their chemical structures were elucidated by physicochemical properties and spectroscopic methods. [Results] These compounds were determined as kaempferol-3-O-α-L-(3-O-acetyl)-rhamnoside-7-O-α-L-rhamnoside(1), sutchuenoside A(2), kaempferol-3-O-[β-D-glucopyranosyl-(1→3)]-α-L-(4-O-acetyl)-rhamnopyranoside-7-O-α-L-rhamnopyranoside(3). Compounds 1-3 are isolated from genus Laportea for the first time. Compound 3 is a new compound. [Conclusions] This study lays a foundation for improving the quality standard of L. bulbifera and the development and utilization of its resources.
文摘Background:The role of DNA analysis for ethnicity inferencing is a topic that attracts much interest from researchers in forensic identification,especially for identifying unknown bodies and trace evidence.So far,the approaches considered effective for ethnic inferencing are autosomal single-nucleotide polymorphisms,Y-chromosome short-tandem repeats(STRs),and mitochondrial DNA haplotyping,which successfully demonstrates the association of specific nucleotides or patterns with population groups.Ethnic inferencing based on autosomal STRs is complex due to the nature of recombination in gamete formation.Aim:This study attempts to use clustering analysis to associate alleles and loci of autosomal STRs with population groups.Materials and Methods:We examined the allele frequency data from 19 STRs loci from the Malay Indonesian population(n=470)to compare with other populations,namely,Chinese Indonesian(n=133)and four reference populations(Malay Malaysian,Filipino,Chinese,and Caucasian).K-Medoids clustering analysis was carried out to pinpoint alleles and loci affecting the population clustering process.Results:The first stage of clustering results placed Malay Indonesians and four other Asian populations,namely,Chinese Indonesian,Malay Malaysian,Filipino,and Chinese,in Cluster 1,whereas the Caucasian group was in Cluster 2.It indicates that the CSF1PO,D5S818,and D8S1179 loci significantly distinguished the five Asian population groups from the Caucasian group,whereas D2S441,D8S1179,and D22S1045 were the three loci that significantly influenced the separation between Malay Indonesians and other groups.Conclusions:We conclude that K-medoids clustering analysis has the potential to play a role in ethnicity estimation by pinpointing specific STRs alleles.
文摘This article is devoted to developing a recognition method of race and ethnicity of individual based on portrait photographs. The reference image is formed based on selected geometric points of the face and a special algorithm for calculating the characteristic parameters of the images available in the database. Next, the original image is compared with the reference images of ethnic groups, and thus, the affiliation of the original image to a specific ethnic group is determined.
