Aim To provide a rapid and reliable method for identifying the fork medicine Stellaria media （Linn. ） Cyr. （Herba Stellariae mediae） （Caryophyllaceae） from its adulterant Myosoton aquaticure （L.） Fries （Herba...Aim To provide a rapid and reliable method for identifying the fork medicine Stellaria media （Linn. ） Cyr. （Herba Stellariae mediae） （Caryophyllaceae） from its adulterant Myosoton aquaticure （L.） Fries （Herba Myosoti aquatici） （Caryophyllaceae） by polymerase chain reaction （PCR） technology. Methods A molecular genetic approach has been developed to identify S. media for the first time. 5S-rRNA spacer domain was amplified by PCR from the isolated genomic DNA, and the PCR products were then sequenced. Results The nucleotide sequences of S. media and M. aquaticum were measured to determine their identity. Furthermore, the nucleotide sequences of three Stellaria species, S. vestita, S. longifolia and S. radians, were also measured for the sake of providing the evidence of the biological phylogeny of SteUaria. Diversity between DNA sequence and restriction enzyme mapping among a variety of the species was found in their 5S-rRNA spacer domains. Conclusion The 5S-rRNA spacer domains can be used as a molecular marker for differentiating S. media from M. aquaticum and in phylogenetie studies of Stellaria.展开更多
根据GenBank中乳酸杆菌16 S^23 S rRNA基因间沉默区序列设计引物,进一步鉴定猪源乳酸杆菌分离株HZ521;并通过体外试验,以嗜酸乳酸杆菌ATCC 4356为参考菌株,探讨HZ521株的益生素作用。部分16 S^23 S rRNA基因序列同源性分析结果表明,该...根据GenBank中乳酸杆菌16 S^23 S rRNA基因间沉默区序列设计引物,进一步鉴定猪源乳酸杆菌分离株HZ521;并通过体外试验,以嗜酸乳酸杆菌ATCC 4356为参考菌株,探讨HZ521株的益生素作用。部分16 S^23 S rRNA基因序列同源性分析结果表明,该分离株属于瑞士乳酸杆菌。HZ521株具有较强的产酸能力,能耐受强酸,对Hela细胞的黏附率为87.2%,显著高于ATCC4356株(P<0.01)。表明瑞士乳酸杆菌HZ521株具有益生素特性,可作为肠道益生素的候选菌株。展开更多
文摘Aim To provide a rapid and reliable method for identifying the fork medicine Stellaria media （Linn. ） Cyr. （Herba Stellariae mediae） （Caryophyllaceae） from its adulterant Myosoton aquaticure （L.） Fries （Herba Myosoti aquatici） （Caryophyllaceae） by polymerase chain reaction （PCR） technology. Methods A molecular genetic approach has been developed to identify S. media for the first time. 5S-rRNA spacer domain was amplified by PCR from the isolated genomic DNA, and the PCR products were then sequenced. Results The nucleotide sequences of S. media and M. aquaticum were measured to determine their identity. Furthermore, the nucleotide sequences of three Stellaria species, S. vestita, S. longifolia and S. radians, were also measured for the sake of providing the evidence of the biological phylogeny of SteUaria. Diversity between DNA sequence and restriction enzyme mapping among a variety of the species was found in their 5S-rRNA spacer domains. Conclusion The 5S-rRNA spacer domains can be used as a molecular marker for differentiating S. media from M. aquaticum and in phylogenetie studies of Stellaria.
文摘根据GenBank中乳酸杆菌16 S^23 S rRNA基因间沉默区序列设计引物,进一步鉴定猪源乳酸杆菌分离株HZ521;并通过体外试验,以嗜酸乳酸杆菌ATCC 4356为参考菌株,探讨HZ521株的益生素作用。部分16 S^23 S rRNA基因序列同源性分析结果表明,该分离株属于瑞士乳酸杆菌。HZ521株具有较强的产酸能力,能耐受强酸,对Hela细胞的黏附率为87.2%,显著高于ATCC4356株(P<0.01)。表明瑞士乳酸杆菌HZ521株具有益生素特性,可作为肠道益生素的候选菌株。
