During the induction of gamete-producing gametangia, induced gametophytes werecollected at 4 days intervals (0,4,8, 12 d) and total RNAs were isolated by CsCl gradient ultracentrifu-gation. Some stage-specific express...During the induction of gamete-producing gametangia, induced gametophytes werecollected at 4 days intervals (0,4,8, 12 d) and total RNAs were isolated by CsCl gradient ultracentrifu-gation. Some stage-specific expressed mRNAs were identified by differential display of mRNAs from dif-ferent developing stages of the gametophytes. The cDNA of one specific mRNA was verified, cloned andsequenced. This gene was specifically expressed during 4 days of induction, and had partial homologoussequence with tobacco IAA-binding protein gene. It suggests that this cDNA may represent a gene whichis related to the LAA regulating function during the development of the gametophytes.展开更多
[Objective] The paper was to explore the pathogenicity of cloned genomic DNA of porcine circovirus-like virus Pl to neonatal mice via different inoculation routes （brain, liver and muscle）. [Method] Cloned genomic D...[Objective] The paper was to explore the pathogenicity of cloned genomic DNA of porcine circovirus-like virus Pl to neonatal mice via different inoculation routes （brain, liver and muscle）. [Method] Cloned genomic DNA of P1 was inoculated to neonatal mice via different routes of brain, liver and muscle. Tissues of heart, liver, spleen, lung, kidney and brain were taken from neonatal mice at 7, 14 and 21 d post inoculation, re- spectively. Pl in various tissues were qualitatively and quantitatively detected by using ordinary PCR and quantitative real-time PCR. Meanwhile, histopathological changes were analyzed. [Result] Pl was detected in neonatal mice inoculated through three different routes. The viral load of tis- sues at 7 d post inoculation was significantly higher than those at 14 and 21 d post inoculation. Moreover, muscle inoculation led to the highest viral load in all tissues of neonatal mice. [Conclusion] Pl infection caused different degrees of pathological damage to heart, liver, lung, kidney and brain in neonatal mice.展开更多
[ Objective] This study aimed to establish DNA fingerprints of 23 Acer truncatum clones, thus providing the theoretical basis for selection, classification and identification of A. truncatum varieties. [Metho...[ Objective] This study aimed to establish DNA fingerprints of 23 Acer truncatum clones, thus providing the theoretical basis for selection, classification and identification of A. truncatum varieties. [Method] Sixteen pairs of SRAP primers with rich polymorphism and high specificity were used to establish DNA fin-gerprints. [Result] A total of 223 bands were amplified with 16 primer pairs, including 197 polymorphic bands. Averagely 13.9 loci and 12.3 polymorphic loci were amplified with each primer pair. The average percentage of polymorphic loci reached 88. 34% . [ Conclusion] The classification result drawn by cluster analy-sis is consistent with that obtained based on main characteristics and genetic relationships of A. truncatum, clones. By using DNA fingerprints established with prim-er pairs ME1-EM4 and ME2-EM1, 23 A. truncatum clones can be effectively distinguished, and the confidence probability is greater than 99.99%.展开更多
A repeated sequence DNA fragment, L5B-4, was cloned from the 5 kb BamHI DNA fragments of rat genomic DNA. The expressions of the L5B-4 DNA fragment are different in liver and hepatoma cells. The amounts of transcripts...A repeated sequence DNA fragment, L5B-4, was cloned from the 5 kb BamHI DNA fragments of rat genomic DNA. The expressions of the L5B-4 DNA fragment are different in liver and hepatoma cells. The amounts of transcripts in hepatoma cells are lower in nucleus and higher in cytoplasm, especially in polysomal RNA, as compared with that in liver cells. The alteration shown in polysomal RNA of hepatoma cells seems to be specific. These results are discussed with respect to the possible function of this repeated DNA and its variation in hepatoma cells.展开更多
针对浓香型白酒大曲样本,以16S r RNA基因为目的片段,分别采用16S r DNA克隆文库法和高通量测序法分析大曲中细菌微生物群落的组成,并通过丰度和多样性分析,比较了两种方法在研究大曲样品细菌多样性方面的适用性。结果表明,在门、纲、...针对浓香型白酒大曲样本,以16S r RNA基因为目的片段,分别采用16S r DNA克隆文库法和高通量测序法分析大曲中细菌微生物群落的组成,并通过丰度和多样性分析,比较了两种方法在研究大曲样品细菌多样性方面的适用性。结果表明,在门、纲、目、科和属的分类水平上,克隆文库方法检测大曲样本微生物得到4个门,4个纲,5个目,4个科,6个属;高通量测序得到13个门,22个纲,33个目,61个科,133个属。在门的水平上,克隆文库与高通量测序检测出优势类群的总数量与总丰度分别为3个(99.32%)和4个(98.61%),共有优势类群及其丰度分别为Firmicutes(88.88%和79.32%)、Proteobacteria(7.8%和15.04%)、Actinobacteria(2.72%和1.77%)。重复样本分析,得出的结果相似。克隆文库法与高通量测序法在反映样本微生物群落规模上差异较大,而在反应大曲样本中主要微生物的物种组成及数量比例上结果相近,特别是样本中优势微生物类群的结果基本相同。两种方法各具优势。展开更多
文摘During the induction of gamete-producing gametangia, induced gametophytes werecollected at 4 days intervals (0,4,8, 12 d) and total RNAs were isolated by CsCl gradient ultracentrifu-gation. Some stage-specific expressed mRNAs were identified by differential display of mRNAs from dif-ferent developing stages of the gametophytes. The cDNA of one specific mRNA was verified, cloned andsequenced. This gene was specifically expressed during 4 days of induction, and had partial homologoussequence with tobacco IAA-binding protein gene. It suggests that this cDNA may represent a gene whichis related to the LAA regulating function during the development of the gametophytes.
基金Supported by National Natural Science Foundation of China(31272574,30972184)
文摘[Objective] The paper was to explore the pathogenicity of cloned genomic DNA of porcine circovirus-like virus Pl to neonatal mice via different inoculation routes （brain, liver and muscle）. [Method] Cloned genomic DNA of P1 was inoculated to neonatal mice via different routes of brain, liver and muscle. Tissues of heart, liver, spleen, lung, kidney and brain were taken from neonatal mice at 7, 14 and 21 d post inoculation, re- spectively. Pl in various tissues were qualitatively and quantitatively detected by using ordinary PCR and quantitative real-time PCR. Meanwhile, histopathological changes were analyzed. [Result] Pl was detected in neonatal mice inoculated through three different routes. The viral load of tis- sues at 7 d post inoculation was significantly higher than those at 14 and 21 d post inoculation. Moreover, muscle inoculation led to the highest viral load in all tissues of neonatal mice. [Conclusion] Pl infection caused different degrees of pathological damage to heart, liver, lung, kidney and brain in neonatal mice.
基金Supported by Agricultural Improved Variety Project of Shandong Province(LKZ[2012]No.213,LKZ[2014]No.96)
文摘[ Objective] This study aimed to establish DNA fingerprints of 23 Acer truncatum clones, thus providing the theoretical basis for selection, classification and identification of A. truncatum varieties. [Method] Sixteen pairs of SRAP primers with rich polymorphism and high specificity were used to establish DNA fin-gerprints. [Result] A total of 223 bands were amplified with 16 primer pairs, including 197 polymorphic bands. Averagely 13.9 loci and 12.3 polymorphic loci were amplified with each primer pair. The average percentage of polymorphic loci reached 88. 34% . [ Conclusion] The classification result drawn by cluster analy-sis is consistent with that obtained based on main characteristics and genetic relationships of A. truncatum, clones. By using DNA fingerprints established with prim-er pairs ME1-EM4 and ME2-EM1, 23 A. truncatum clones can be effectively distinguished, and the confidence probability is greater than 99.99%.
文摘A repeated sequence DNA fragment, L5B-4, was cloned from the 5 kb BamHI DNA fragments of rat genomic DNA. The expressions of the L5B-4 DNA fragment are different in liver and hepatoma cells. The amounts of transcripts in hepatoma cells are lower in nucleus and higher in cytoplasm, especially in polysomal RNA, as compared with that in liver cells. The alteration shown in polysomal RNA of hepatoma cells seems to be specific. These results are discussed with respect to the possible function of this repeated DNA and its variation in hepatoma cells.
文摘针对浓香型白酒大曲样本,以16S r RNA基因为目的片段,分别采用16S r DNA克隆文库法和高通量测序法分析大曲中细菌微生物群落的组成,并通过丰度和多样性分析,比较了两种方法在研究大曲样品细菌多样性方面的适用性。结果表明,在门、纲、目、科和属的分类水平上,克隆文库方法检测大曲样本微生物得到4个门,4个纲,5个目,4个科,6个属;高通量测序得到13个门,22个纲,33个目,61个科,133个属。在门的水平上,克隆文库与高通量测序检测出优势类群的总数量与总丰度分别为3个(99.32%)和4个(98.61%),共有优势类群及其丰度分别为Firmicutes(88.88%和79.32%)、Proteobacteria(7.8%和15.04%)、Actinobacteria(2.72%和1.77%)。重复样本分析,得出的结果相似。克隆文库法与高通量测序法在反映样本微生物群落规模上差异较大,而在反应大曲样本中主要微生物的物种组成及数量比例上结果相近,特别是样本中优势微生物类群的结果基本相同。两种方法各具优势。
