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  secondary metabolites
Belyakov, Marine Microorganisms and Their Biologically Active Secondary Metabolites,
      
Analysis of Secondary Metabolites of Microscopic Fungi of the Genus Penicillium by Chromatographic Techniques
      
Occurrence of Indole Alkaloids among Secondary Metabolites of Soil Aspergillus Spp.
      
Secondary metabolites of three strains of Penicillium aurantiogriseumisolated from permafrost sediments were identified.
      
It was demonstrated that the fungus Penicillium expansum 2-7, a resident strain of the orbital complex Mir, which became dominant at the end of a long-term space flight, formed biologically active secondary metabolites (antibiotics).
      
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Through determining the contents of secondary metabolites(active constituents)in Eucommia ulmoides Oliv.(Duzhong)leaves, it is found that secondary metabolites appear dynamic accumulation trend. \ \ Variance analysis of the contents of secondary metabolites is notable in different clones.The result illustrates that the inheritable gene is an important factor in regulating the formation of secondary metaboiltes. \ \ In the growth season of Duzhong leaves, the contents of chlorogenic acid and aucubin are highest...

Through determining the contents of secondary metabolites(active constituents)in Eucommia ulmoides Oliv.(Duzhong)leaves, it is found that secondary metabolites appear dynamic accumulation trend. \ \ Variance analysis of the contents of secondary metabolites is notable in different clones.The result illustrates that the inheritable gene is an important factor in regulating the formation of secondary metaboiltes. \ \ In the growth season of Duzhong leaves, the contents of chlorogenic acid and aucubin are highest in June and November.The content of geniposidic acid is the highest in June,too.The content of flavonoids,however,is the highest in May.The content of gutta percha is the highest in May and June,then decreasing gradually.It seems that correlation exists between dynamic accumulation of secondary metabolites and tree growth rate.

通过对杜仲叶中次生代谢物含量的测定,对其生长积累动态作了以下有关分析:不同无性系的次生代谢物含量差异显著:绿原酸在略1中含量最高(407%),略49中含量最低(127%);桃叶珊瑚甙在略1中含量最高(398%),略49中含量最低(108%);京尼平甙酸在灌3中含量最高(012%),略49中含量最低(005%);总黄酮在略11中含量最高(167%),略41中含量最低(018%);杜仲胶在略1中含量最高(380%),略0中含量最低(176%);表明树木的遗传基因(决定个体生长发育)也是调控次生代谢产物的重要因素。在年周期中,杜仲叶次生代谢物生长积累的动态变化为:绿原酸含量以6月、11月份最高,5月份最低;桃叶珊瑚甙在6月、11月份含量最高,7月、8月份最低;京尼平甙酸在6月份含量最高,5月、11月份最低;总黄酮以5月份含量最高,10月份最低;杜仲胶含量以5~6月份最高,以后逐渐下降。似乎与树体年生长速率存在一定的相关关系。

The induced variation of some chemical substances in the body of the larch, Larix princippis rupprechtii Mayr. injured by the larch case bearer, Coleophora sinensis Yang, was studied. The tests were conducted in 1996~1998 in the forest areas of Wutai and Guandi Mountains located in Shanxi, China.The results showed that the North China larch could produce some secondary substances and change the compositions of some compounds in its body when it was injured by the larch case bearer. The first group of the...

The induced variation of some chemical substances in the body of the larch, Larix princippis rupprechtii Mayr. injured by the larch case bearer, Coleophora sinensis Yang, was studied. The tests were conducted in 1996~1998 in the forest areas of Wutai and Guandi Mountains located in Shanxi, China.The results showed that the North China larch could produce some secondary substances and change the compositions of some compounds in its body when it was injured by the larch case bearer. The first group of the secondary substances was tannin and free phenol. Tannin was raised so quickly with the case bearer feeding leaves in the moderate damaged forest that its content in leaves could exceed that in the other two areas. The second change was the variation of peroxidase activity in the leaves. The more damages the forest suffered, the more activities of the peroxidase the trees had. Another pest resistant factor of the forest was the dropping of its reducing sugar and Vc when the damage happened, so that the pest did not prefer to the nutrition of the leaves. These factors together took part in the chemical defense of the larch against the case bearer attack.

本文于 1 997~ 1 998年在山西省关帝山和五台山林区 ,通过定点定期采样结合实验室化学测试 ,研究了华北落叶松鞘蛾 ,ColeophorasinensisYang (鳞翅目 ,鞘蛾科 ) ,取食危害后 ,诱导华北落叶松LarixPrincip pis rupprechtiiMayr.树体内化学物质的变化及其与抗虫性相关的生理生化反应。结果表明 ,华北落叶松鞘蛾危害后 ,能使树体产生一系列生理生化反应 ,表现出强烈的抗虫性。首先是树体内产生有毒次生代谢物如单宁和游离酚的变化。在鞘蛾幼虫暴食的 5月份 ,单宁在针叶内从低含量迅速增加 ,形成第 1个峰值。在中等受害区 ,这种增加幅度到鞘蛾取食后的 6月份可以超过对照区。严重受害区单宁在前、中期略低于前 2区 ,但持续增长时间更长。单宁在韧皮部内的含量在初期由高向低下降 ,说明它有可能是从枝条转向叶部 ,以补充抗性之急需。游离酚在鞘蛾危害后期才开始增加 ,中等受害区其含量最高 ,严重受害区和对照区之间差异不显著。其次 ,树体内保护酶系如过氧化物酶在受害区高于对照区 ,受害愈重 ,含量越高。第 3类是树体营养物质如还原糖和Vc的含量在受害区显著低于...

本文于 1 997~ 1 998年在山西省关帝山和五台山林区 ,通过定点定期采样结合实验室化学测试 ,研究了华北落叶松鞘蛾 ,ColeophorasinensisYang (鳞翅目 ,鞘蛾科 ) ,取食危害后 ,诱导华北落叶松LarixPrincip pis rupprechtiiMayr.树体内化学物质的变化及其与抗虫性相关的生理生化反应。结果表明 ,华北落叶松鞘蛾危害后 ,能使树体产生一系列生理生化反应 ,表现出强烈的抗虫性。首先是树体内产生有毒次生代谢物如单宁和游离酚的变化。在鞘蛾幼虫暴食的 5月份 ,单宁在针叶内从低含量迅速增加 ,形成第 1个峰值。在中等受害区 ,这种增加幅度到鞘蛾取食后的 6月份可以超过对照区。严重受害区单宁在前、中期略低于前 2区 ,但持续增长时间更长。单宁在韧皮部内的含量在初期由高向低下降 ,说明它有可能是从枝条转向叶部 ,以补充抗性之急需。游离酚在鞘蛾危害后期才开始增加 ,中等受害区其含量最高 ,严重受害区和对照区之间差异不显著。其次 ,树体内保护酶系如过氧化物酶在受害区高于对照区 ,受害愈重 ,含量越高。第 3类是树体营养物质如还原糖和Vc的含量在受害区显著低于对照区 ,造成害虫的营养成份改变和质量下降。这 3方面因素参与了华北落叶松的化学防御体系。

Through determining the contents of secondary metabolites in Eucommia ulmoides Oliv. (Duzhong) leaves of different clones growing in the same site type, the result showed that the relationship between the growth features of individuals of Duzhong and the contents of secondary metabolites, and variance analysis of the contents of secondary metabolites is notable in different clones. The results show that the growth features of Duzhong (genetic factors) are important factors in regulating sythesis and accumulation...

Through determining the contents of secondary metabolites in Eucommia ulmoides Oliv. (Duzhong) leaves of different clones growing in the same site type, the result showed that the relationship between the growth features of individuals of Duzhong and the contents of secondary metabolites, and variance analysis of the contents of secondary metabolites is notable in different clones. The results show that the growth features of Duzhong (genetic factors) are important factors in regulating sythesis and accumulation of the secondary metabolites.\;Through analizing the relationship between the growth features of individuals and the contents of secondary metabolites, it is concluded that the contents of secondary metabolites in early budding individvals are higher than those in late ones, the gutta\|percha contents in individuals with oval leaves are appareatly higher than those in ones with elliptic leaves, leaf area is negatively relevant to the gutta\|percha content, the contents of geniposidio acid and geniposide in the smooth\|bark type are higher than those in the rough\|bark one; while sex, DBH, height and activity of nitrate reductase (NR) have no effects on the contents of secondary metabolites. These results provided theoretic basis for the selection of excellent clones.

通过同一立地条件下生长的 4 0个杜仲无性系叶中次生代谢物 (有效成分 )含量的测定 ,对杜仲个体生长发育特性与其次生代谢物含量的关系进行了分析 ,研究结果表明 :4 0个杜仲无性系叶中次生代谢物含量差异显著 ,从而进一步证明了杜仲个体生长发育特性 (遗传因素 )是调控次生代谢产物合成和积累的重要因素 ;芽开绽期早的个体 ,其次生代谢物含量高于芽开绽期晚的个体 ;椭圆形叶的杜仲胶含量明显高于卵形叶的个体 ;叶面积与杜仲胶含量呈显著的负相关 ;光皮类型的京尼平甙酸、京尼平甙含量高于粗皮类型 ;树木的性别、胸径生长量、树高生长量和硝酸还原酶活力则对次生代谢物含量无影响。这些研究结果为杜仲的良种选育提供了表型参考依据

 
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