醚提取物

The antifungal activities of these materials were investigated and build foundation to develop low poison plant antifungal products. In experiment, polyphenols were extracted by reflux ectraction method which applyed petroleum ether to degrease and methyl alcohol solvent. Phenolic hydroxyl were examined and inspected by colour-developing reaction and the content of total polyphenols was determined by UV-spectrophotometry. Screening test were performed to the antifungal activities of polyphenol extraction by the tube dilution method to the selected ten pathogenic fungus such as Dothiorella gregaria, Rhizoctonia solani, Phyllosticta pirina, and the minimal inhibitory concentration were measured. The column chromatography and thin layer chromatography were applyed to separate and analyse cortex extracts of Dracaena cochinchinensi Lour.

实验部分采用以石油醚脱脂，甲醇为溶剂的回流提取法来提取植物多酚，用显色反应检识酚羟基；采用紫外分光光度法对多酚粗体物进行总多酚含量的测定；选取了聚生小穴壳菌、立枯丝核菌、梨叶点霉等10株常见农林业致病真菌，采用试管液基稀释法对多酚粗提取物进行了抗真菌活性筛选试验，并测定其最低抑菌浓度；采用柱层析法和薄层层析法对其中抑菌效果较好的龙血竭进行分离分析，根据其中3种化合物的光谱数据UV、IR、~(13C-NMR、1H-NMR和MS鉴定其结构。

Then, the whole herb of Juncus effusus was extracted with 95% ethanol. The ethanolic extract was further separated with petroether, chloroform, ethyl acetate and methanol in turn to give four fractions.

用95%乙醇提取制备了总提取物，然后将总提物用石油醚、氯仿、乙酸乙酯、甲醇依次萃取，分成极性大小不同的部位，通过药理活性筛选后确定了有效部位为乙酸乙酯部分。

De Wit seeds with petrol ether,purified water and 95% ethanol was studied using test tube method.The chemical components of Leucaena leucocephala de Wit seeds were preliminarily demonstrated using precipitation reaction and color reaction of multiple indicators.

方法采用试管反应法，对银合欢种子的石油醚、水、95%乙醇提取物进行研究，通过多种指示剂和显色剂的沉淀反应或颜色反应，对银合欢种子可能含有的化学成分进行初步研究。

MethodsThe mixture was extracted from Leucaena leucocephala de Wit seeds with petrol ether,purified water and 95% ethanol was studied using test tube method.The chemical components of Leucaena leucocephala de Wit seeds were preliminarily demonstrated using precipitation reaction and color reaction of multiple indicators.

方法采用试管反应法，对银合欢种子的石油醚、水、95%乙醇提取物进行研究，通过多种指示剂和显色剂的沉淀反应或颜色反应，对银合欢种子可能含有的化学成分进行初步研究。

The fractions of Ligroine and chloroform part of the the EtOH extraction were isolated and purified by column chromatography on silica gel and Sephadex LH 20 and recrystallization. Their structures were studied by using UV, IR, H-NMR, 13C-NMR, and MS, techniques.

运用硅胶、Sephadex LH-20柱色谱等方法对芫花乙醇提取物的石油醚及氯仿萃取部分进行化学成分研究，并利用UV、IR、1HNMR、13CNMR、MS等光谱技术鉴定其化学结构。

The reaction of iodide-potassium iodide was negative to evaluate that EGP was nonstarch polysaccharides, ulfate was 11.92%, content of the total polysaccharide was 83%, mainly including 70.13% D-galactose and 17.95% 3,6-anhydro-galactose.

不溶于有机溶剂，碘-碘化钾反应呈阴性，说明提取物为非淀粉性多糖，产率为20%，总硫酸基含量11.92%，总糖含量83%，主要由70.13%的D-半乳糖和17.95%的3，6-内醚半乳糖组成。

The parasiticidal effect of ethanol extracts from a plant Dioscorea zingiberensis on dactylogyrid Dactylogyrus intermedius found in goldfish was studied to search for parasiticidal substances by standard laboratory procedures compared with the other four drugs mebendazole, abamectin, ivermectin and praziquantel.

以寄生在金鱼Carassius auratus鳃部的中型指环虫Dactylogyrus intermedius为指示寄生虫，采用活体感染、活体杀虫的方法，研究了用不同溶剂（石油醚（沸程60~90℃）、氯仿、乙酸乙酯、乙醇和水）分别对盾叶薯蓣Dioscorea zingiberensis进行提取，其5种提取物的杀虫活性。

The insecticidal activities of the ethanol extracts and 5 kinds of extracts with petroleum ether, chloroform, ethyl acetate, n-butanol, aqueous from Rubia cordifolia L. against wolfberry aphis was investigated.

采用点滴法，测定了茜草乙醇提取物和石油醚、氯仿、乙酸乙酯、正丁醇和水5种不同极性萃取物对枸杞蚜虫的触杀活性。

Tagal collected in the mangrove forest in Hainan Island.Twenty-three compounds were isolated from the petroleum ether portion of the 95% ethanolic extract of the C. tagal.

从角果木的95%乙醇提取物石油醚萃取液中分离得到23个化合物，通过理化常数，1D NMR、2D NMR、IR、MS方法鉴定了19个化合物的结构，其中新化合物11个。

In chapter 3, 83 volatile chemical constituents have been identified from the petroleum ether extracted part of ethanol extract of Debregeasia longifolia Wedd., and the relative percentages of the compounds are determined by GC method. From the extract of trichloromethane and ethyl acetate, 8 compounds have been isolated.

第三章首次对长叶水麻乙醇提取物的石油醚萃取部分分离并鉴定出83种成分，并用毛细管气相色谱面积归一化法测定了各组分的相对百分含量；从氯仿和乙酸乙酯萃取部分分离得到了8种化合物，用波谱学方法鉴定了其中2种成分。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。