A new ent-kaurane diterpenoid from Isodon japonica

<正>One new ent-kaurane diterpenoid,named maoyecrystal L was isolated from the EtOAc extract of the dried leaves of lsodon japonica.Its structure was established by various spectroscopic means and confirmed by X-ray crystallographic analysis.     

Electrospun nanofibers decorated with bio-sonochemically synthesized gold nanoparticles as an ultrasensitive probe in amalgam-based mercury (II) detection system

In this study, bio-ultrasound-assisted synthesized gold nanoparticles using Gracilaria canaliculata algae have been immobilized on a polymeric support and used as a glassy probe chemosensor for detection and rapid removal of Hg²⁺ ions. The function of the suggested chemosensor has been explained based on gold-amalgam formation and its catalytic role on the reaction of sodium borohydride and rhodamine B (RhB) with fluorescent and colorimetric sensing function. The catalyzed reduction of RhB by the gold amalgam led to a distinguished color change from red and yellow florescence to colorless by converting the amount of Hg²⁺ deposited on Au-NPs. The detection limit of the colorimetric and fluorescence assays for Hg²⁺ was 2.21 nM and 1.10 nM respectively. By exposing the mentioned colorless solution to air for at least 2 h, unexpectedly it was observed that the color and fluorescence of RhB were restored. Have the benefit of the above phenomenon a recyclable and portable glass-based sensor has been provided by immobilizing the Au-NPs and RB on the glass slide using electrospinning. Moreover, the introduced combinatorial membrane has facilitated the detection and removal of Hg²⁺ ions in various Hg (II)-contaminated real water samples with efficiency of up to 99%.     

毛萼绣线菊中的一个微量新生物碱—绣线菊碱S

从滇产毛萼绣线菊根中分离到一新的微量生物碱－绣线菊碱Ｓ，经各种波谱解析，其结构鉴定为（１）。     

百合科植物比较形态解剖学研究——Ⅱ、万年青、吉祥草、紫花玉簪、芦荟、吊兰后生木质部管状分子的比较解剖

根据V.L.Cheadla关于单子叶植物解剖性状演化观点,即(1)根、茎、叶中均存在导管较根、根状茎中具导管或仅根中有导管进化;(2)导管分子短而宽较导管分子长而细进化;(3)单穿孔板类型较梯状穿孔板类型高级,而梯状穿孔板模隔数越少越高级.用上述3条标准对百合科(Liliaceae)中铃兰族(Conval-lavrieae)万年青属(Robdea Roth)万年青(R.japonica(Thunb.)Roth),吉祥草属(Reineckja Kunth)吉祥草(R.carnea(Andr.)Kunth.);萱草族(Hemero ca-lleae)玉簪属(Hosta Tratt.)紫花玉簪(H。albo-marginata(Hook.)Ohwi)芦荟族(Aloeae)芦荟属(Aloe L.)芦荟(A.vera L.var.chinensis(Haw.)Berg.);吊兰族(Asphodeleae),吊兰属(Chlorophytum Ker-Gawl.)吊兰(C.comosum(Thunb.)Peker)等植物的后生木质部管状分子进行比较解剖研究.结果表明:吊兰、芦荟、紫花玉簪较吉祥草、万年青进化.     

海产无脊椎动物呼吸强度的比较

对测试的１８种海产经济无脊椎动物的呼吸强度进行的系统比较研究表明：日本和螺类，随时间的延长其呼吸强度呈逐渐下降趋势。说明对氧的含量的敏感性强；而蛤类则随时间的延长其呼吸强度呈逐渐上升趋势，说明对氧的含量的敏感性差．呼吸强度与动物的生活习性有关．习见织纹螺、短滨螺接近陆生生活，呼吸强度最强；日本呼吸强度次之；再次为一般螺类；最弱的为蛤类．     

HPLC-DAD法测定西藏产区金银花花蕾及叶中化学成分含量

采用高效液相色谱 二极管阵列检测法（HPLC DAD）,对8批西藏产区的“亚特一号”良种金银花花蕾和叶中的活性成分进行了分析。测定了其中的8种主要化合物绿原酸、木犀草苷、马钱酸、隐绿原酸、马钱苷、断氧化马钱苷、芦丁、异绿原酸C的质量分数,分别为花蕾：3.85%、0.15%、0.18%、0.15%、0.11%、0.11%、0.17%和0.11%;叶：3.58%、0.79%、0.40%、0.08%、0.07%、0.24%、0.18%和0.05%。该研究为快速探明西藏产区良种金银花中的化学成分及进一步开发利用提供了方法和数据支持。     

旋覆花化学成分研究

通过提取、分离等实验手段对菊科植物旋覆花(Inula japonica Thunb)干燥头状花序的化学成分进行研究,寻找旋覆花中有效成分.对旋覆花乙酸乙酯萃取物采用硅胶、葡聚糖凝胶(Sephadex LH-20)、反相硅胶等柱色谱层析技术进行分离纯化,最终得到单体化合物.从旋覆花提取物中分离纯化得到6个高氧化度倍半萜类化合物,其中化合物1、3和6为首次从该种中分离得到.     

渗透压和pH对日本鳗鲡精子活力的影响

日本鳗鲡(Anguillajaponica) 的精子在低于或等于精浆渗透压 (≤ 76 6 1kPa)的溶液中不运动 ,在一定渗透压范围内 (10 2 1 4～ 3830 4kPa) ,超过精浆渗透压的溶液可激活精子 .鳗鲡精子在偏碱性的溶液 (pH 7 0～ 8 9)中活力较强 ,酸性 (pH <7 0 )或碱性较强 (pH >8 9)的溶液 ,都将降低精子活力 .被激活后运动一段时间静止下来的精子 ,在人工精浆中孵育后 ,可被重新激活 .     

A New Biphenyl Glycoside from the Leaves of Eriobotrya japonica

The leaves of Eriobotrya japonica (Thunb.) Lindl (Rosaceae) have been widely used as a folk medicine (known as “Pipaye”) to treat stomachache and promote antitussive, anti-inflammatory and diuretic effects in China. A number of triterpenoids1,2, sesquit…     

细江蓠硫酸酯多糖的提取工艺优化

为实现资源丰富的南海海藻细江蓠的高值化利用,对细江蓠硫酸酯活性多糖的提取工艺进行优化研究.采用能有效保护硫酸酯基团的方法提取细江蓠硫酸酯多糖,通过正交实验研究了浸提温度、浸提时间、加水量与多糖产率的关系.结果表明,对细江蓠多糖产率的影响程度依次为:浸提时间>加水量>浸提温度,其最佳提取工艺为:浸提时间3 h,加水量60倍,浸提温度90℃.多糖产率可达13.42%.