不同种的金银花中微量生物元素的分布规律

本文报告不同种的金银花中微量生物元素的分布规律:不同种的金银花中微量生物元素含量的对数与其元素的原子序数成线性关系,并呈现周期性。     

Meiotic differentiation during colony maturation in Saccharomyces cerevisiae

As yeast colonies ceased growth, cells at the edge of these colonies transited from the cell division cycle into meiosis at high efficiency. This transition occurred remarkably synchronously and only at late stages of colony maturation. The transition occurred on medium containing acetate or low concentrations of glucose, but not on medium containing high glucose. The repression by high glucose was overcome when IME1 was overexpressed from a plasmid. Experiments with different growth media imply that meiosis in colonies is triggered by changes in the nutrient environment as colonies mature. HAP2 is required to sporulate in any carbon source, whereas GRR1 is required for glucose repression of sporulation. CLN3 is required to repress meiosis in colonies but not in liquid cultures, indicating that the regulators that mediate the transition to meiosis in colonies are not identical to the regulators that mediate this transition in liquid cultures.     

龙爪槐花中芦丁的薄层及紫外光谱鉴别

目的：对龙爪槐花中的芦丁进行定性鉴别。方法：采集不同花期龙爪槐的花，提取后用薄层层析法及紫外分光光度法进行芦丁的定性鉴别。结果：龙爪槐花中含有有效成分芦丁。结论：龙爪槐花可作为开发芦丁新的药源植物。     

HPLC法测定银花抗感片中绿原酸的含量

目的采用高效液相色谱法测定银花抗感片中绿原酸的含量。方法色谱柱C18,以乙腈-0.4%磷酸溶液(10∶90)为流动相;检测波长为327nm。结果绿原酸的进样量在0.04～0.8μg范围内与峰面积呈良好的线性关系(r=0.9996),平均加样回收率为98.1%,RSD为1.15%。结论该方法简便易行,结果可靠,可有效地控制银花抗感片的质量。     

Immunohistochemical study on distribution of endocrine cells in gastrointestinal tract of flower fish （Pseudophoxinus antalyae）

INTRODUCTION Gastrointestinal hormones are secreted by endocrine cells which are distributed throughout the mucosa of the gastrointestinal tract. They play important roles in the overall regulation of digestive processes such as nutrient absorption, gut m…     

金银花主要活性成分对烟曲霉生物膜的体外影响

目的 探讨金银花主要活性成分绿原酸（CRA）对烟曲霉（A.f）生物膜（BF）的体外影响。方法扫描电镜（SEM）鉴定体外烟曲霉BF;二倍稀释法测定绿原酸的最低抑菌浓度（MIC）及最低杀真菌浓度（MFC）;各浓度的CRA分别作用于BF 48h后, XTT减低法测定生物膜内菌细胞的代谢活力;结晶紫（CV）法定量生物膜。结果受试菌株经过培养24h、48h后可形成稳定的BF。药物作用48h后,各浓度CRA对菌体代谢活力与空白组相比差异均无统计学意义（P＞0.05）;较高浓度的CRA组（256、512、1024μg/ml）生物膜量与空白组相比,差异有统计学意义（P〈0.05）。结论烟曲霉体外经培养24h、48h后可形成稳定生物膜;金银花主要活性成分绿原酸不能杀死烟曲霉生物膜细胞,但可以抑制生物膜胞外基质的形成,其抑制作用呈浓度依赖性。     

鲜泡桐花与阴干泡桐花化学成分的对比研究

目的　对泡桐花的化学成分进行了试验。方法　用比色法测定了阴干泡桐花和鲜泡桐花中总黄酮的含量 ,并采用薄层扫描法 (TLCS)测定了鲜泡桐花、阴干泡桐花和鲜泡桐花水提干浸膏中熊果酸的含量。结果　干泡桐花中总黄酮的含量和熊果酸的含量分别为 3 0 81%和 4 2 6 2 1mg/kg ,鲜泡桐花中总黄酮的含量和熊果酸的含量分别为 1 2 31%和 62 35mg/kg。结论　所建立的方法可靠 ,操作简便为泡桐花的开发利用提供质控依据     

青海道地药材秦艽花中龙胆苦苷的含量测定

目的测定青海道地药材秦艽花中龙胆苦苷的含量。方法采用反相高效液相色谱法测定不同产地秦艽花中龙胆苦苷的含量。色谱柱为Lichrospher C18（4．6×250mm,5μm）,流动相为甲醇-水（1：2v／v）,检测波长为254nm。结果在0．54-5．40μg范围内龙胆苦苷峰面积与浓度线性关系良好（r=0．9994）,平均回收率为95．04％（RSD=3．67％）,日内、日间精密度分别为1．20％和1．93％。结论本测定方法灵敏、准确、简便,适用于秦艽花中龙胆苦苷含量测定。     

枇杷花总黄酮提取工艺的研究

目的:优化枇杷花总黄酮提取工艺。方法:以总黄酮为考察指标,通过单因素及L9(34)正交试验优选枇杷花总黄酮的提取工艺。结果:确定以1∶10的料液比在60℃提取3次,每次1h为最佳提取条件。结论:本实验采用的方法和指标适合于枇杷花总黄酮的提取,为将其开发成为现代中药成方制剂提供了科学依据。