Tonalites from the island arc rock assemblage in the Zêtang segment of the Yarlung Zangbo suture zone were analyzed for major,trace elements (including REE) and Sr-Nd isotope. The experimental data demonstrate th...Tonalites from the island arc rock assemblage in the Zêtang segment of the Yarlung Zangbo suture zone were analyzed for major,trace elements (including REE) and Sr-Nd isotope. The experimental data demonstrate that the tonalites have the adakite-like characteristics,including high SiO2 (58%―63%),Al2O3 (18.4%―22.4%),Sr (810×10 6―940×10 6),Sr/Y (77―106),low HREE (Y=9×10 6―11×10 6,Yb= 1×10 6―1.3×10 6),with LREE enrichment and faint Eu positive anomaly. ISr (0.70421―0.70487) is rela-tively low whereas 143Nd/144Nd (0.512896―0.512929) and εNd(t) values (+6.7―+7.3) are high. These fea-tures suggest that Zêtang tonalites were formed by the partial melting of subducted oceanic crust,with involvement of a small amount of oceanic sediments. The identification of Zêtang adakites,derived from slab melting,presents new evidence for the intra-Tethyan subduction and the previous sugges-tion about the existence of intra-oceanic island arc within Tethys.展开更多
石斛属(D end robium Sw.)为兰科植物,约有1 500种。我国有80种,其中药用石斛有51种。在我国传统医学中,石斛为常用药材,现代药理研究证明石斛具有抗肿瘤、抗衰老、降血糖等作用。霍山石斛是安徽省特产的药用石斛,为石斛中的上品。综述...石斛属(D end robium Sw.)为兰科植物,约有1 500种。我国有80种,其中药用石斛有51种。在我国传统医学中,石斛为常用药材,现代药理研究证明石斛具有抗肿瘤、抗衰老、降血糖等作用。霍山石斛是安徽省特产的药用石斛,为石斛中的上品。综述了霍山石斛的生理生化、生物学特性、有效成分等方面的研究现状。展开更多
目的:采用PMP(1-苯基-3-甲基-5-吡唑啉酮)柱前衍生化-HPCE法测定多糖的单糖组成,探讨不同种源霍山石斛、铜皮石斛及野生河南石斛药效物质基础的相似性。方法:采用石英毛细管柱(100 cm×50μm),350mmol/L硼酸溶液(以1.0 mol/L Na OH...目的:采用PMP(1-苯基-3-甲基-5-吡唑啉酮)柱前衍生化-HPCE法测定多糖的单糖组成,探讨不同种源霍山石斛、铜皮石斛及野生河南石斛药效物质基础的相似性。方法:采用石英毛细管柱(100 cm×50μm),350mmol/L硼酸溶液(以1.0 mol/L Na OH溶液调至p H 10)为缓冲液,运行电压20 k V,柱温为25℃,检测波长250 nm,运行时间34 min。结果:5种石斛样品共检出木糖、葡萄糖、甘露糖、半乳糖、半乳糖醛酸和核糖6种单糖。相似度评价显示,同一种源石斛样品10个批次间的相似度均在0.98以上,但不同种源的霍山石斛、铜皮石斛及野生河南石斛单糖组成及含量明显不同。结论:多糖部位PMP柱前衍生化-HPCE法具有简单、快速、准确、重现性好等优点,为不同种源的霍山石斛、铜皮石斛与野生河南石斛的定性鉴别及药材内在质量评价提供新的参考依据。展开更多
以大别山石斛[Dendrobium dabieshanense(C.Z.Tang et S.J.Cheng)]为材料,探讨了不同外植体、培养基中不同的生长素配比、不同成分的大量元素及部分微量元素含量对不定芽分化和试管苗生根的影响。结果表明,适宜大别山石斛组培的外植体...以大别山石斛[Dendrobium dabieshanense(C.Z.Tang et S.J.Cheng)]为材料,探讨了不同外植体、培养基中不同的生长素配比、不同成分的大量元素及部分微量元素含量对不定芽分化和试管苗生根的影响。结果表明,适宜大别山石斛组培的外植体是种子,其次是茎;不定芽增殖的适宜培养基是1/2MS+马铃薯汁10g/L+IBA 0.1mg/L+琼脂8g/L+食糖30g/L,pH5.6;试管苗生根的适宜培养基是1/2MS+香蕉汁5g/L+IBA 0.2mg/L+琼脂8g/L+食糖30g/L,pH5.6。展开更多
基金the National Natural Science Key Foundation of China (Grant No. 40534019)Open Research Fund Program of Key Laboratory of Marginal Sea Ge-ology of the Chinese Academy of Sciences (Grant No. MSGL-04-13)the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCXZ-SW-117)
文摘Tonalites from the island arc rock assemblage in the Zêtang segment of the Yarlung Zangbo suture zone were analyzed for major,trace elements (including REE) and Sr-Nd isotope. The experimental data demonstrate that the tonalites have the adakite-like characteristics,including high SiO2 (58%―63%),Al2O3 (18.4%―22.4%),Sr (810×10 6―940×10 6),Sr/Y (77―106),low HREE (Y=9×10 6―11×10 6,Yb= 1×10 6―1.3×10 6),with LREE enrichment and faint Eu positive anomaly. ISr (0.70421―0.70487) is rela-tively low whereas 143Nd/144Nd (0.512896―0.512929) and εNd(t) values (+6.7―+7.3) are high. These fea-tures suggest that Zêtang tonalites were formed by the partial melting of subducted oceanic crust,with involvement of a small amount of oceanic sediments. The identification of Zêtang adakites,derived from slab melting,presents new evidence for the intra-Tethyan subduction and the previous sugges-tion about the existence of intra-oceanic island arc within Tethys.
文摘石斛属(D end robium Sw.)为兰科植物,约有1 500种。我国有80种,其中药用石斛有51种。在我国传统医学中,石斛为常用药材,现代药理研究证明石斛具有抗肿瘤、抗衰老、降血糖等作用。霍山石斛是安徽省特产的药用石斛,为石斛中的上品。综述了霍山石斛的生理生化、生物学特性、有效成分等方面的研究现状。
文摘目的:采用PMP(1-苯基-3-甲基-5-吡唑啉酮)柱前衍生化-HPCE法测定多糖的单糖组成,探讨不同种源霍山石斛、铜皮石斛及野生河南石斛药效物质基础的相似性。方法:采用石英毛细管柱(100 cm×50μm),350mmol/L硼酸溶液(以1.0 mol/L Na OH溶液调至p H 10)为缓冲液,运行电压20 k V,柱温为25℃,检测波长250 nm,运行时间34 min。结果:5种石斛样品共检出木糖、葡萄糖、甘露糖、半乳糖、半乳糖醛酸和核糖6种单糖。相似度评价显示,同一种源石斛样品10个批次间的相似度均在0.98以上,但不同种源的霍山石斛、铜皮石斛及野生河南石斛单糖组成及含量明显不同。结论:多糖部位PMP柱前衍生化-HPCE法具有简单、快速、准确、重现性好等优点,为不同种源的霍山石斛、铜皮石斛与野生河南石斛的定性鉴别及药材内在质量评价提供新的参考依据。
