期刊文献+
共找到2,055篇文章
< 1 2 103 >
每页显示 20 50 100
Study on the Promotion of Digital Trade to Northeast Asian Regional Economy
1
作者 Yating Mo Zhaoxia Zhang 《Proceedings of Business and Economic Studies》 2024年第1期162-168,共7页
Society is currently transitioning from the era of informatization and digitization to the era of intelligence.Advanced technologies such as artificial intelligence,the Internet of Things,and big data are permeating e... Society is currently transitioning from the era of informatization and digitization to the era of intelligence.Advanced technologies such as artificial intelligence,the Internet of Things,and big data are permeating every aspect of production and life.This penetration presents a rare opportunity for the development of digital trade and catalyzes innovation in traditional trade patterns.This paper first analyzes the inevitability of digital trade development in Northeast Asia.Secondly,it delves into the challenges faced by digital trade development and explores in-depth the promotion strategy for digital trade’s impact on the economic development of the Northeast Asia region,providing insights from various perspectives for reference. 展开更多
关键词 Digital trade Northeast Asian regional economy promotION
下载PDF
Mutations in pre-core and basic core promoter regions of hepatitis B virus in chronic hepatitis B patients 被引量:12
2
作者 Xiao-Ling Wang Jian-Ping Ren +3 位作者 Xue-Qing Wang Xiao-Hong Wang Shao-Fang Yang Yi Xiong 《World Journal of Gastroenterology》 SCIE CAS 2016年第11期3268-3274,共7页
AIM: To investigate the frequency of mutations in pre-core (pre-C) and basic core promoter (BCP) regions of hepatitis B virus (HBV) from Shanxi Province, and the association between mutations and disease related index... AIM: To investigate the frequency of mutations in pre-core (pre-C) and basic core promoter (BCP) regions of hepatitis B virus (HBV) from Shanxi Province, and the association between mutations and disease related indexes.METHODS: One hundred chronic hepatitis B patients treated at Shanxi Province Hospital of Traditional Chinese Medicine were included in this study. PCR-reverse dot blot hybridization and mismatch amplification mutation assay (MAMA)-PCR were used to detect the mutations in the HBV pre-C and BCP regions. HBV DNA content and liver function were compared between patients with mutant HBV pre-C and BCP loci and those with wild-type loci. The consistency between PCR-reverse dot blot hybridization and MAMA-PCR for detecting mutations in the HBV pre-C and BCP regions was assessed.RESULTS: Of the 100 serum samples detected, 9.38% had single mutations in the pre-C region, 29.17% had single mutations in the BCP region, 41.67% had mutations in both BCP and pre-C regions, and 19.79% had wild-type loci. The rates of BCP and pre-C mutations were 65.7% and 34.3%, respectively, in hepatitis B e antigen (HBeAg) positive patients, and 84.6% and 96.2%, respectively, in HBeAg negative patients. The rate of pre-C mutations was significantly higher in HBeAg negative patients than in HBeAg positive patients (&#x003c7;<sup>2</sup> = 26.62, P = 0.00), but there was no significant difference in the distribution of mutations in the BCP region between HBeAg positive and negative patients (&#x003c7;<sup>2</sup> = 2.43, P = 0.12). The presence of mutations in the pre-C (Wilcoxon W = 1802.5, P = 0.00) and BCP regions (Wilcoxon W = 2906.5, P = 0.00) was more common in patients with low HBV DNA content. Both AST and GGT were significantly higher in patients with mutant pre-C and BCP loci than in those with wild-type loci (P &#x0003c; 0.05). PCR-reverse dot blot hybridization and MAMA-PCR for detection of mutations in the BCP and pre-C regions had good consistency, and the Kappa values obtained were 0.91 and 0.58, respectively.CONCLUSION: HBeAg negative patients tend to have HBV pre-C mutations. However, these mutations do not cause increased DNA copies, but associate with damage of liver function. 展开更多
关键词 Basic core promoter region Pre-core region Liver injury Reverse dot blot hybridization Mismatch amplification mutation assay
下载PDF
Association of Genetic Variation in the Promoter Region of OXTR with Differences in Social Affective Neural Processing
3
作者 Garret O’Connell Heather C. Whalley +4 位作者 Prerona Mukherjee Andrew C. Stanfield Christian Montag Jeremy Hall Martin Reuter 《Journal of Behavioral and Brain Science》 2012年第1期60-66,共7页
Evidence supports the involvement of oxytocin in social behavior. The oxytocin receptor gene (OXTR) has been associated with differences in social brain function and risk for autism. Motivated by recent work, we inves... Evidence supports the involvement of oxytocin in social behavior. The oxytocin receptor gene (OXTR) has been associated with differences in social brain function and risk for autism. Motivated by recent work, we investigated the effect of variation in the common functional rs2268498 T/C polymorphism in the promoter region of OXTR on neural responses to fear expressions. 46 healthy subjects were divided into genotype groups of C carriers (n = 32) and TT ho-mozygous (n = 14) and neural activity was measured during the recognition of fear and neutral expressions. Results showed that during the recognition of fear expressions, the TT genotype group exhibited increased responding in the inferior occipital gyrus, considered important for face processing, compared to carriers of the C allele (P < 0.005;cluster corrected for whole brain), an effect not found for neutral faces. These results indicate the impact of this OXTR genetic variant on individual differences in social affective neural processing. 展开更多
关键词 OXTR promoter region INFERIOR OCCIPITAL GYRUS fMRI EMOTIONAL Facial Processing
下载PDF
Dissecting the key genomic regions underlying high yield potential in common wheat variety‘Kenong 9204’
4
作者 ZHAO Chun-hua ZHANG Na +5 位作者 FAN Xiao-li JI Jun SHI Xiao-li CUI Fa LING Hong-qing LI Jun-ming 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2023年第9期2603-2616,共14页
The foundation parents play key roles in the genetic improvement of both yield potential and end-use quality in wheat.Characterizing the genetic basis that underlies certain beneficial traits in the foundation parents... The foundation parents play key roles in the genetic improvement of both yield potential and end-use quality in wheat.Characterizing the genetic basis that underlies certain beneficial traits in the foundation parents will provide theoretical reference for molecular breeding by a design approach.‘Kenong 9204’(KN9204)is a candidate foundation parent characterized by ideotype,high yield potential,and particularly high nitrogen fertilizer utilization.To better understand the genetic basis of its high yield potential,high throughput whole-genome re-sequencing(10×)was performed on KN9204,its parental lines and its derivatives.A high-resolution genetic composition map of KN9204 was constructed,which showed the parental origin of the favorable genomic segments based on the identification of excellent yield-related quantitative trait loci(QTL)from a bi-parental mapping population.Xiaoyan 693(XY693),a wheat–Thinopyrum ponticum partial amphidiploid,contributed a great deal to the high yield potential of KN9204,and three major stable QTLs from XY693 were fine mapped.The transmissibility of key genomic segments from KN9204 to its derivatives were delineated,indicating that haplotype blocks containing beneficial gene combinations were conserved along with directional selection by breeders.Evidence for selection sweeps in the breeding programs was identified.This study provides a theoretical reference for the breeding of high-yield wheat varieties by a molecular design approach. 展开更多
关键词 Kenong 9204 high-yielding potential quantitative trait locus genetic composition map key genomic regions
下载PDF
Studies on Genetic Transformation of Fresh-cut Chrysanthemum Using DREB1A Promoted by Stress-induced Promoter rd29A 被引量:1
5
作者 Haiquan HUANG Qing DUAN +4 位作者 Ting JIANG Xinyu DENG Jingjing FEI Jun XU Meijuan HUANG 《Agricultural Biotechnology》 CAS 2014年第2期7-9,共3页
In this study, DERB1A transcription factor and stress-induced promoter rd29A were isolated respectively and amplified from Arabidopsis thaliana, se- quenced and analyzed by DNAsis. In addition, the stress-induced prom... In this study, DERB1A transcription factor and stress-induced promoter rd29A were isolated respectively and amplified from Arabidopsis thaliana, se- quenced and analyzed by DNAsis. In addition, the stress-induced promoter rd29A was utilized to construct the plant expression vector of DERB1A, which was transformed into Agrobacterium tumefaciens. Furthermore, the transgenic regeneration system of fresh-cut chrysanthemum from callus to plantlets was established successfully. On this basis, chrysanthemum leaf-disc explants were genetically transformed with Agrobacterium-mediated method. Two positive transgenie plantlets were obtained in vitro. Based on PCR detection, DREB1A transcription factor was integrated into chrysanthemum genome, which laid the foundation for breeding new transgenie cultivars of fresh-cut chrysanthemum with high comprehensive stress resistance, good cmalitv and high field. 展开更多
关键词 DREB1A transcription factor Stress-induced promoter rd29A Fresh-cut chrysanthemum genetic transformation
下载PDF
Strategies for Promoting Regional Smart Education
6
作者 Xiaoyu Kang 《Journal of Contemporary Educational Research》 2023年第8期130-134,共5页
Owing to the continuous advancement of information technology,smart education has become a new direction for educational development.Through investigation,it was found that there is an imbalanced education development... Owing to the continuous advancement of information technology,smart education has become a new direction for educational development.Through investigation,it was found that there is an imbalanced education development in some regions.To promote the integration of urban and rural education,promoting regional smart education as a whole will be the key to solving this problem.Based on this direction,this study focused on explaining the concept and characteristics of smart education,the value and significance of regional smart education,the problems and challenges of regional smart education,and strategies and measures to promote the development of regional smart education.This is significant to form a universal regional smart education promotion strategy and provide reference for the overall promotion of smart education. 展开更多
关键词 regional issues Smart education promotion strategy
下载PDF
Analysis of SNPs in the Promoter Region of the Growth Hormone(GH) Gene in Mini-pigs
7
作者 ZHENG Mao-en PAN Deng-ke +7 位作者 FENG Shu-tang LIU Xiao YE Shao-hui PU Ya-bin HE Xiao-hong ZHAO Qian-jun GUAN Wei-jun MA Yue-hui 《畜牧兽医学报》 CAS CSCD 北大核心 2010年第S1期26-30,共5页
Single nucleotide polymorphisms(SNPs) of the growth hormone(GH) gene were investigated in six pig breeds,consisting of four mini-pig breeds(Wuzhishan,Bama,Xiang and Tibet pig),and two others(Dahlan and Landrace pig).T... Single nucleotide polymorphisms(SNPs) of the growth hormone(GH) gene were investigated in six pig breeds,consisting of four mini-pig breeds(Wuzhishan,Bama,Xiang and Tibet pig),and two others(Dahlan and Landrace pig).Three pairs of primers for promoter regions of the GH gene were designed on the basis of the pig genomic sequence and SNPs were detected by the PCR-SSCP method.The results indicated three mutations in the 5’-flanking region.The analysis results showed that the frequencies of allele A and D in four mini-pig breeds were higher than that in other breeds at a locus within the 5’-flanking region(P【0.05).These results suggest that differences in body size may be associated with these SNPs of 5’-flanking region and amino acid mutation of the signal peptide of GH in these pig breeds. 展开更多
关键词 minipigs growth hormone promoter region DWARF
下载PDF
Cloning and Analysis of the Promoter Region of Rat uPA Gene
8
作者 Yan LIU Jin-wen XIONG Li-gang CHEN Yong-hong TIAN Cheng-liang XIONG 《Journal of Reproduction and Contraception》 CAS 2007年第1期1-10,共10页
Objective To clone and analyze the promoter sequence of rat urokinase plasminogen activator protein gene. Methods The genomic DNA was extracted from rat testicular tissue. According to urokinase plasminogen activator,... Objective To clone and analyze the promoter sequence of rat urokinase plasminogen activator protein gene. Methods The genomic DNA was extracted from rat testicular tissue. According to urokinase plasminogen activator, the gene sense primer and antisense primer of uPA gene were designed and synthesized, then Touch-Down PCR were performed. After proper purification, the PCR product was sequenced, analyzed with the promoter prediction software and compared with the DNA sequence of rattuas urokinase plasminogen activator. Results The cloned uPA gene was about 1 572 bp in length, which contained a full open-reading frame with 21 bp in length exons, and the upper region of transcriptional start was 1 551 bp in length which was eucaryon transcriptional control area. The 5' UTR had a promoter region including a non-responsive TATA-box. Not only the GC-box binding region was found in this gene, but also active protein I (AP1) and SP1 were seen in other regions. Conclusion A 1 572 bp uPA gene fragment (GenBank accession No.X65651) was obtained from rat genomic DNA library, containing eucaryon transcriptional control area with a promoter region, non-conspicuous TATA-box, GC-box and an extron. A non-responsive TATA-box is located at the upper -30 region. 展开更多
关键词 RAT testicular tissue urokinase plasminogen activator Touch-Down PCR promoter region eucaryou transcriptional control area
下载PDF
Evaluation of Uncertainty in Measuring the Content of CaM V35S Promoter in Genetically Modified Soybean,GTS40-3-2,by Real-time Quantitative PCR
9
作者 Dong WANG Jun SONG +5 位作者 Ling'an GUO Shaorong LEI Wenjuan LIU Lijuan CHANG Quan YIN Fuli ZHANG 《Agricultural Biotechnology》 CAS 2015年第1期23-26,30,共5页
[ Objective ] This study aimed to investigate the major contributors to the measurement uncertainty in quantitative analysis of genetically modified ingreclients and improve the quality of quantitative detection of ge... [ Objective ] This study aimed to investigate the major contributors to the measurement uncertainty in quantitative analysis of genetically modified ingreclients and improve the quality of quantitative detection of genetically modified components. [ Method] The content of CaMV35S promoter (parameter) in GTS40- 3-2 soybean powder samples was measured to estimate the measurement uncertainty preliminarily. [ Result] Type A uncertainty (uA) ' type B uncertainty (uB) and combined standard uncertainty (Uc) were 0.0 004, 0.002 and 0.002, respectively. At a confidence level ofp = 95% and freedom degree of Voff = 3 251, coverage factor k = 1.96, expanded uncertainty U = 0.004. The final measurement result was C = 0.028 ± 0. 004, which was dose to the conventional true value (0.03). Thus, the measurement uncertainty was relatively small, indicating a high quality of measurement. In this study, uncertainty evaluation indicated that the deviation of micro liquid transfer made the greatest contribution to the measurement uncertainty. [ Cludusion ] The deviation of micro liquid transfer should be reduced to im- prove the quality of measurement. 展开更多
关键词 genetically modified soybean GTS40-3 -2) Content of CaM-V35S promoter UNCERTAINTY EVALUATION
下载PDF
Standization Trends in Local Regions Ningxia Hui Autonomous Region Utilizes Standardization to Promote Economic Development
10
《China Standardization》 2008年第1期26-27,共2页
In China, 10 ethnic minorities with a combined population of over 20 million people are followers of Islam. In Ningxia Hui Autonomous Region, the population is nearly 6 million, a-mong which the Islamic population is ... In China, 10 ethnic minorities with a combined population of over 20 million people are followers of Islam. In Ningxia Hui Autonomous Region, the population is nearly 6 million, a-mong which the Islamic population is about 2 million. In China as a whole, more than 20 million people enjoy eating food prepared according to Islamic guidelines, known as hal'al food. 展开更多
关键词 than more Standization Trends in Local regions Ningxia Hui Autonomous region Utilizes Standardization to promote Economic Development over high
下载PDF
Genetic map construction and functional characterization of genes within the segregation distortion regions(SDRs)in the F_(2:3) populations derived from wild cotton species of the D genome
11
作者 KIRUNGU Joy Nyangasi MAGWANGA Richard Odongo +10 位作者 SHIRAKU Margaret Linyerera LU Pu MEHARI Teame Gereziher XU Yuanchao HOU Yuqing AGONG Stephen Gaya ZHOU Yun CAI Xiaoyan ZHOU Zhongli WANG Kunbo LIU Fang 《Journal of Cotton Research》 2020年第4期278-296,共19页
Background:Segregation distortion(SD)is a common phenomenon among stable or segregating populations,and the principle behind it still puzzles many researchers.The F2:3 progenies developed from the wild cotton species ... Background:Segregation distortion(SD)is a common phenomenon among stable or segregating populations,and the principle behind it still puzzles many researchers.The F2:3 progenies developed from the wild cotton species of the D genomes were used to investigate the possible plant transcription factors within the segregation distortion regions(SDRs).A consensus map was developed between two maps from the four D genomes,map A derived from F2:3 progenies of Gossypium klotzschianum and G.davidsonii while Map B from G.thurberi and G.trilobum F2:3 generations.In each map,188 individual plants were used.Results:The consensus linkage map had 1492 markers across the 13 linkage groups with a map size of 1467.445 cM and an average marker distance of 1.0370 cM.Chromosome D502 had the highest percentage of SD with 58.6%,followed by Chromosome D507 with 47.9%.Six thousand and thirty-eight genes were mined within the SDRs on chromosome D502 and D507 of the consensus map.Within chromosome D502 and D507,2308 and 3730 genes were mined,respectively,and were found to belong to 1117 gourp out of which 622 groups were common across the two chromosomes.Moreover,genes within the top 9 groups related to plant resistance genes(R genes),whereas 188 genes encoding protein kinase domain(PF00069)comprised the largest group.Further analysis of the dominant gene group revealed that 287 miRNAs were found to target various genes,such as the gra-miR398,gramiR5207,miR164a,miR164b,miR164c among others,which have been found to target top-ranked stress-responsive transcription factors such as NAC genes.Moreover,some of the stress-responsive cis-regulatory elements were also detected.Furthermore,RNA profiling of the genes from the dominant family showed that higher numbers of genes were highly upregulated under salt and osmotic stress conditions,and also they were highly expressed at different stages of fiber development.Conclusion:The results indicated the critical role of the SDRs in the evolution of the key regulatory genes in plants. 展开更多
关键词 genetic map Segregation distortion region Cis-regulatory elements GENES miRNA
下载PDF
牙鲆GHR基因Promoter区微卫星序列多态性与生长性状关系的初步研究 被引量:10
12
作者 倪静 尤锋 +5 位作者 于深辉 张培军 徐冬冬 吴志昊 文爱韵 徐永立 《中国海洋大学学报(自然科学版)》 CAS CSCD 北大核心 2008年第5期719-725,共7页
采用牙鲆GHR基因5’端Promoter区的1个微卫星标记,对胶南和日照2个牙鲆养殖群体进行了群体遗传多样性的研究,并探索该基因多态性位点与牙鲆生长性状之间的相关性。结果表明,2个群体在该座位的等位基因数为12和9个,有效等位基因数为6.26... 采用牙鲆GHR基因5’端Promoter区的1个微卫星标记,对胶南和日照2个牙鲆养殖群体进行了群体遗传多样性的研究,并探索该基因多态性位点与牙鲆生长性状之间的相关性。结果表明,2个群体在该座位的等位基因数为12和9个,有效等位基因数为6.26和5.04个,多态信息含量为0.84和0.80。2个群体该座位的Hardy-Weinberg遗传偏离指数均为正值,并没有显示出杂合子缺失,但各基因型分布频率都在一定程度上偏离Hardy-Weinberg平衡(P<0.01)。连锁分析中发现,在胶南群体中,IM基因型对应的个体在全重、全长、体长、头长、体高和眼径形态学数据中均是最大的;在日照群体中,BC基因型对应的个体在全重、全长、体高、尾柄高、尾柄长和眼径数据中均是最大的;而CJ基因型对应的个体在体长和头长这两组数据中是最大的。该结果为研究GHR基因的变异对鱼类生长发育的影响及探索将该基因作为生长遗传标记的可行性奠定了实验基础。 展开更多
关键词 牙鲆 GHR基因5’端promoter 微卫星 遗传多样性 性状连锁分析
下载PDF
Interleukin-10 promoter polymorphisms in patients with hepatitis B virus infection or hepatocellular carcinoma in Chinese Han ethnic population 被引量:9
13
作者 Juan Wang, Hong Ni, Li Chen and Wen-Qin Song College of Life Sciences, Nankai Umversity, Tianjin 300071. China and College of Life Sciences, Shenzhen University, Shenzhen 518060, China 《Hepatobiliary & Pancreatic Diseases International》 SCIE CAS 2006年第1期60-64,共5页
BACKGROUND: Since single nucleotide polymorphisms (SNPs) can serve as gene markers, polymorphism profiles may help scientists to identify the full collection of genes that contribute to the development of complex dise... BACKGROUND: Since single nucleotide polymorphisms (SNPs) can serve as gene markers, polymorphism profiles may help scientists to identify the full collection of genes that contribute to the development of complex diseases such as cancer. The distribution of interleukin-10 (IL-10) promoter polymorphisms in Chinese Han ethnic patients with hepatitis B virus (HBV) infection and hepatocellular carcinoma (HCC) was investigated in this study. METHODS: The polymorphisms of IL-10 promoter region were detected by pulymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) and sequencing. Sixty-six health controls, 42 patients with HBV infection, 30 HCC patients, and cell line SMMC-7721 were examined this way. RESULTS: Polyrnorphisms of T/C or T/N on-872 site occurred frequently in Han ethnic population. Pulyrnorphisms were detected in HBV and HCC patients and cell line SMMC-7721. The hotspot among the pulymorphisms was inserting base A between-1058 and-1057. CONCLUSION: Polymorphisms of IL-10 promoter in HBV and HCC patients may be associated with HBV infection and HCC development. 展开更多
关键词 INTERLEUKIN-10 polymorphisms on promoter region polymerase chain reaction-single strand conformation polymorphism hepatitis B virus carcinoma hepatocellular
下载PDF
Shallow Genetic Structure of Pholis fangi in Bohai Sea and Yellow Sea Inferred from mt DNA Control Region 被引量:2
14
作者 GAO Tianxiang LI Lin +4 位作者 FANG Rundong LIU Guanghui WANG Lei XU Hanxiang SONG Na 《Journal of Ocean University of China》 SCIE CAS CSCD 2019年第4期947-952,共6页
Pholis fangi is an ecologically important fish species inhabiting Chinese coastal waters of Yellow Sea and Bohai Sea. To investigate the genetic diversity and population genetic structure of P. fangi, a fragment of 48... Pholis fangi is an ecologically important fish species inhabiting Chinese coastal waters of Yellow Sea and Bohai Sea. To investigate the genetic diversity and population genetic structure of P. fangi, a fragment of 487 bp in the first hypervariable region (HVR-1) of the mitochondrial DNA (mtDNA) control region was sequenced for 181 individuals collected from Bohai Sea and Yel- low Sea. A total of 18 polymorphic sites were detected, which defined 25 haplotypes. A moderate level of haplotype diversity (h = 0.7052) and a low level of nucleotide diversity (π= 0.0028) were detected. Both the phylogenetic tree and the haplotype network showed no significant genealogical structure difference among sampling locations. Pairwise FST comparison and hierarchical mo- lecular variance analysis (AMOVA) revealed that no significant genetic structure difference existed throughout the investigated re- gions, suggesting a high gene exchange among different populations. The results of neutrality test and mismatch distribution analysis indicated that a late Pleistocene population expansion (38000 127000 years ago) happened. Seasonal schooling migration may con- tribute to the genetically homogeneous population structure of the species. 展开更多
关键词 Pholis fangi control region of MTDNA genetIC diversity genetIC structure DEMOGRAPHIC history
下载PDF
Satellite Constellation Design with Multi-Objective Genetic Algorithm for Regional Terrestrial Satellite Network 被引量:11
15
作者 Cuiqin Dai Guimin Zheng Qianbin Chen 《China Communications》 SCIE CSCD 2018年第8期1-10,共10页
Constellations design for regional terrestrial-satellite network can strengthen the coverage for incomplete terrestrial cellular network. In this paper, a regional satellite constellation design scheme with multiple f... Constellations design for regional terrestrial-satellite network can strengthen the coverage for incomplete terrestrial cellular network. In this paper, a regional satellite constellation design scheme with multiple feature points and multiple optimization indicators is proposed by comprehensively considering multi-objective optimization and genetic algorithm, and "the Belt and Road" model is presented in the way of dividing over 70 nations into three regular target areas. Following this, we formulate the optimization model and devise a multi-objective genetic algorithm suited for the regional area with the coverage rate under simulating, computing and determining. Meanwhile, the total number of satellites in the constellation is reduced by calculating the ratio of actual coverage of a single-orbit constellation and the area of targets. Moreover, the constellations' performances of the proposed scheme are investigated with the connection of C++ and Satellite Tool Kit(STK). Simulation results show that the designed satellite constellations can achieve a good coverage of the target areas. 展开更多
关键词 regional terrestrial-satellite net-work constellation design multi-objective optimization genetic algorithm coverage performance
下载PDF
Expression Pattern of the Foreign Gene Regulated by the Tomato rbcS3A Promoter in Transgenic Tomato
16
作者 徐晓霞 金烨 杨万年 《Agricultural Science & Technology》 CAS 2013年第4期559-563,共5页
[Objective] This study aimed to reveal the expression pattern of foreign genes regulated by tomato rbcS3A promoter in transgenic tomato. [Method] Rubisco small subunit promoter rbcS3A was cloned by PCR, fused to the u... [Objective] This study aimed to reveal the expression pattern of foreign genes regulated by tomato rbcS3A promoter in transgenic tomato. [Method] Rubisco small subunit promoter rbcS3A was cloned by PCR, fused to the upstream of Gus coding region in a binary vector, and transformed into tomato plants mediated by Agrobacterium. Histochemical staining on PCR positive plants was performed to ana- lyze the expression pattern of the foreign gene regulated by the tomato rbcS3A pro- moter in transgenic tomato. [Result] A total of 15 positive plants were obtained, ac- counting for 33.3%. Histochemical staining showed that the expression level of Gus fusion gene was highest in mature leaf, lower in reproductive organs such as fruit, and not detected in seed. [Conclusion] More positive seedlings were obtained using the modified tissue culture method. Under the control of tomato rbcS3A promoter, exogenous gene highly expressed in transgenic plant leaves, but did not express in seeds and tomato pulp. 展开更多
关键词 Tomato rbcS3A promoter TOMATO genetic transformation Gus staining
下载PDF
Review on hepatitis B virus precore/core promoter mutations and their correlation with genotypes and liver disease severity 被引量:5
17
作者 Rajesh Kumar 《World Journal of Hepatology》 2022年第4期708-718,共11页
Of 350 million people worldwide are chronically infected with hepatitis B virus(HBV)and are at risk of developing cirrhosis and hepatocellular carcinoma(HCC)later in life.HBV is the most diverse DNA virus,and its geno... Of 350 million people worldwide are chronically infected with hepatitis B virus(HBV)and are at risk of developing cirrhosis and hepatocellular carcinoma(HCC)later in life.HBV is the most diverse DNA virus,and its genome is composed of four open reading frames:Presurface antigen/surface antigen gene(preS/S),precore/core gene(preC/C),polymerase gene(P),and theχgene(χ).HBV produces quasispecies naturally or in response to antiviral agents because of the absence of proofreading activity amid reverse transcription and a high replication rate.The virus has 10 genotypes(A to J)with different geographical distributions.There are various HBV mutations in the HBV genome,including preC/C mutations,preS/S mutations,P gene mutations,andχgene mutations.The core promoter region plays a vital part in the replication,morphogenesis and pathogenesis of the virus.The precore region also plays a crucial role in viral replication.Both core promoter and precore mutations rescue the virus from host immune surveillance and result in the formation of mutated strains that may have altered pathogenicity.preC/C mutations are associated with liver disease progression.Precore mutations stop hepatitis B e antigen(HBeAg)production and basal core promoter mutations downregulate HBeAg production.Mutations in the basal core promoter are also associated with increased HBV replication and an increased incidence of advanced liver diseases such as cirrhosis and HCC.The emergence of antiviral-resistant mutations is the main reason for treatment failure.This review focuses mainly on preC/C promoter mutations and their correlation with genotypes and liver disease severity.Thorough perception and knowledge of HBV genetic variety and mutants could be vital to discover techniques for the prognosis and control of HBV infection. 展开更多
关键词 Hepatitis B virus Hepatitis B virus e antigen Hepatocellular carcinoma Basal core promoter Core promoter region Precore region Fulminant hepatitis Acute hepatitis
下载PDF
GFAP promoter directs lacZ expression specifically in a rat hepatic stellate cell line 被引量:4
18
作者 Gunter Maubach Michelle Chin Chia Lim 《World Journal of Gastroenterology》 SCIE CAS CSCD 2006年第5期723-730,共8页
AIM: The GFAP was traditionally considered to be a biomarker for neural gila (mainly astrocytes and nonmyelinating Schwann cells). Genetically, a 2.2-kb human GFAP promoter has been successfully used to target astr... AIM: The GFAP was traditionally considered to be a biomarker for neural gila (mainly astrocytes and nonmyelinating Schwann cells). Genetically, a 2.2-kb human GFAP promoter has been successfully used to target astrocytes in vitro and in vivo. More recently, GFAP was also established as one of the several makers for identifying hepatic stellate cells (HSC). In this project, possible application of the same 2.2-kb human GFAP promoter for targeting HSC was investigated. METHODS: The GFAP-lacZ transgene was transfected into various cell lines (HSC, hepatocyte, and other nonHSC cell types). The transgene expression specificity was determined by X-gal staining of the β-galactosidase activity. And the responsiveness of the transgene was tested with a typical pro-fibrotic cytokine TGF-β1. The expression of endogenous GFAP gene was assessed by real-time RT-PCR, providing a reference for the transgene expression. RESULTS: The results demonstrated for the first time that the 2.2 kb hGFAP promoter was not only capable of directing HSC-specific expression, but also responding to a known pro-fibrogenic cytokine TGF-β1 by upregulation in a doseand time-dependent manner, similar to the endogenous GFAP. CONCLUSION: In conclusion, these findings suggested novel utilities for using the GFAP promoter to specifically manipulate HSC for therapeutic purpose. 展开更多
关键词 promoter regions (genetics) Animals Base Sequence Cell Line DNA Recombinant Gene Expression Glial Fibrillary Acidic Protein HEPATOCYTES Humans Lac Operon RNA Messenger Rats TRANSFECTION Transforming Growth Factor beta Transforming Growth Factor beta1
下载PDF
A Method for Upscaling Genetic Parameters of CERES-Rice in Regional Applications 被引量:1
19
作者 JIANG Min JIN Zhi-qing 《Rice science》 SCIE 2009年第4期292-300,共9页
To upscale the genetic parameters of CERES-Rice in regional applications, Jiangsu Province, the second largest rice producing province in China, was taken as an example. The province was divided into four rice regions... To upscale the genetic parameters of CERES-Rice in regional applications, Jiangsu Province, the second largest rice producing province in China, was taken as an example. The province was divided into four rice regions with different rice variety types, and five to six sites in each region were selected. Then the eight genetic parameters of CERES-Rice, particularly the four parameters related to the yield, were modified and validated using the Trial and Error Method and the local statistical data of rice yield at a county level from 2001 to 2004, combined with the regional experiments of rice varieties in the province as well as the local meteorological and soil data (Method 1). The simulated results of Method 1 were compared with those of other three traditional methods upscaling the genetic parameters, i.e., using one-site experimental data from a local representative rice variety (Method 2), using local long-term rice yield data at a county level after deducting the trend yield due to progress of science and technology (Method 3), and using rice yield data at a super scale, such as provincial, ecological zone, country or continent levels (Method 4). The results showed that the best fitness was obtained by using the Method 1. The coefficients of correlation between the simulated yield and the statistical yield in the Method 1 were significant at 0.05 or 0.01 levels and the root mean squared error (RMSE) values were less than 9% for all the four rice regions. The method for upscaling the genetic parameters of CERES-Rice presented is not only valuable for the impact studies of climate change, but also favorable to provide a methodology for reference in crop model applications to the other regional studies. 展开更多
关键词 simulation model regional application genetic parameter upscaling RICE crop model
下载PDF
Genetic Analysis of the P1 Region of Human Enterovirus 71 Strains and Expression of the 55 F StrainVP1 Protein 被引量:2
20
作者 Jian-qiang Li Jun-jie Yang +5 位作者 Xiu-juan Fan Zhen-peng Sun Yan Sun Huan Li Zi-xin Meng Wei Li 《Virologica Sinica》 CAS CSCD 2012年第1期10-18,共9页
Enterovirus 71 (EV71) is a member of the Entero-virus genus of the Picomaviridae family and is the major cause of Hand, foot, and mouth disease (HFMD) in children. Different strains from Gansu were cloned and the ... Enterovirus 71 (EV71) is a member of the Entero-virus genus of the Picomaviridae family and is the major cause of Hand, foot, and mouth disease (HFMD) in children. Different strains from Gansu were cloned and the P1 protein was sequenced and analysed. Results indicate that there are three kinds of EV71 infections prevalent in Gansu. The VP 1 protein from one of these strains, 55F, was expressed. The recombinant protein was expressed with high level and reacted specifically with the EV71 patient antibody, the recombinant protein was also applied to raise antiserum in rabbits and after the fourth injection a high titer of antiserum was detected by ELISA assay. These data are useful for further clarification of prevalent EV71 strains in the north of China at the molecular level and provide a basis for EV71 diagnosis. 展开更多
关键词 EV71 genetic analysis P1 region EXPRESSION VP1 protein
下载PDF
上一页 1 2 103 下一页 到第
使用帮助 返回顶部