以自主选育的QJ系列羊肚菌品种为试验材料,通过检测子实体氨基酸组成及含量,明确氨基酸营养特征。使用联合国粮食及农业组织(Food and Agriculture Organization of the United Nations,FAO)/世界卫生组织(World Health Organization,W...以自主选育的QJ系列羊肚菌品种为试验材料,通过检测子实体氨基酸组成及含量,明确氨基酸营养特征。使用联合国粮食及农业组织(Food and Agriculture Organization of the United Nations,FAO)/世界卫生组织(World Health Organization,WHO)标准模式谱、系统聚类分析和主成分分析等方法对氨基酸进行全面评价。结果表明,系列品种总体表现为氨基酸种类丰富、必需氨基酸种类齐全的基本特征。其中标准模式谱评价可知QJ-10、QJ-12明显优于其他品种,QJ-9是系列品种中必需氨基酸营养价值最高的品种。聚类分析将系列品种分为4类,第一类为氨基酸总量高、呈味氨基酸丰富,包括QJ-3、QJ-6、QJ-8和QJ-9。主成分分析结果表明,各品种氨基酸综合得分由高到低为QJ-6、QJ-8、QJ-9、QJ-12、QJ-3、QJ-7、QJ-10、QJ-2,其中QJ-6羊肚菌综合得分最高,为0.38。该研究结果为进一步丰富QJ系列羊肚菌基础研究数据,为羊肚菌品种的差异化开发提供参考。展开更多
Naphthenic acids in petroleum are considered a class of biological markers. Their potential use in source correlation and as an indicator of biodegradation was reported in the past (Dzidic et al., 1988; Behar and Albr...Naphthenic acids in petroleum are considered a class of biological markers. Their potential use in source correlation and as an indicator of biodegradation was reported in the past (Dzidic et al., 1988; Behar and Albrecht, 1984). Due to their highly complicated properties, detailed characterization of the acids is difficult. A method based on positive ion CI (chemical ionization) mass spectrometry using isobutane reagent gas to produce (M+15)++ ions was applied to the analysis of naphthenic acid esters. Since the complex mixture of naphthenic acids cannot be separated into individual components, only the determination of relative distribution of acids classified in terms of hydrogen deficiency was possible. The identities and relative distribution of fatty and mono-, di-, tri-, and higher polycyclic acids were obtained from the intensities of the (M+15)++ ions according to z-series formula C-nH-{2n+z}O-2 of naphthenic acids. The components are characterized on the basis of group type and carbon number distributions. A comparison of the FAB and CI results showed that the group type distributions obtained by both methods agree surprisingly well. The results indicated this method is simple, rapid and easy to operate. The geochemical implication of naphthenic acids was investigated by using a set of well-characterized crude oil samples. It is found that the naphthenic acid distribution can be used as a fingerprint for oil-oil and oil-source correlations.展开更多
A glasshouse experiment was conducted to determine the effects of elemental sulfur(S)applications on soil acidity,the solubility of soil iron,and the uptake of iron(Fe)by corn(Zea mays L.).Soil samples were treated wi...A glasshouse experiment was conducted to determine the effects of elemental sulfur(S)applications on soil acidity,the solubility of soil iron,and the uptake of iron(Fe)by corn(Zea mays L.).Soil samples were treated with four rates of sulfur and incubated for 0,20,and 40 days before corn plantation.While one unit increase in S application rate corresponded to a soil pH decrease of approximately 1.52 units,the solubility of the Fe was significantly increased.Fe concentrations in leaves and stems increased as soil pH decreased from 7.03 to 5.42,but further soil acidification decreased Fe concentrations in plant tissues.Overall,applying S at a rate of 0.5 g S kg-1 soil may to enhance corn performance by 45 percent while posing minimal risk to groundwater or crops.展开更多
文摘以自主选育的QJ系列羊肚菌品种为试验材料,通过检测子实体氨基酸组成及含量,明确氨基酸营养特征。使用联合国粮食及农业组织(Food and Agriculture Organization of the United Nations,FAO)/世界卫生组织(World Health Organization,WHO)标准模式谱、系统聚类分析和主成分分析等方法对氨基酸进行全面评价。结果表明,系列品种总体表现为氨基酸种类丰富、必需氨基酸种类齐全的基本特征。其中标准模式谱评价可知QJ-10、QJ-12明显优于其他品种,QJ-9是系列品种中必需氨基酸营养价值最高的品种。聚类分析将系列品种分为4类,第一类为氨基酸总量高、呈味氨基酸丰富,包括QJ-3、QJ-6、QJ-8和QJ-9。主成分分析结果表明,各品种氨基酸综合得分由高到低为QJ-6、QJ-8、QJ-9、QJ-12、QJ-3、QJ-7、QJ-10、QJ-2,其中QJ-6羊肚菌综合得分最高,为0.38。该研究结果为进一步丰富QJ系列羊肚菌基础研究数据,为羊肚菌品种的差异化开发提供参考。
文摘Naphthenic acids in petroleum are considered a class of biological markers. Their potential use in source correlation and as an indicator of biodegradation was reported in the past (Dzidic et al., 1988; Behar and Albrecht, 1984). Due to their highly complicated properties, detailed characterization of the acids is difficult. A method based on positive ion CI (chemical ionization) mass spectrometry using isobutane reagent gas to produce (M+15)++ ions was applied to the analysis of naphthenic acid esters. Since the complex mixture of naphthenic acids cannot be separated into individual components, only the determination of relative distribution of acids classified in terms of hydrogen deficiency was possible. The identities and relative distribution of fatty and mono-, di-, tri-, and higher polycyclic acids were obtained from the intensities of the (M+15)++ ions according to z-series formula C-nH-{2n+z}O-2 of naphthenic acids. The components are characterized on the basis of group type and carbon number distributions. A comparison of the FAB and CI results showed that the group type distributions obtained by both methods agree surprisingly well. The results indicated this method is simple, rapid and easy to operate. The geochemical implication of naphthenic acids was investigated by using a set of well-characterized crude oil samples. It is found that the naphthenic acid distribution can be used as a fingerprint for oil-oil and oil-source correlations.
文摘A glasshouse experiment was conducted to determine the effects of elemental sulfur(S)applications on soil acidity,the solubility of soil iron,and the uptake of iron(Fe)by corn(Zea mays L.).Soil samples were treated with four rates of sulfur and incubated for 0,20,and 40 days before corn plantation.While one unit increase in S application rate corresponded to a soil pH decrease of approximately 1.52 units,the solubility of the Fe was significantly increased.Fe concentrations in leaves and stems increased as soil pH decreased from 7.03 to 5.42,but further soil acidification decreased Fe concentrations in plant tissues.Overall,applying S at a rate of 0.5 g S kg-1 soil may to enhance corn performance by 45 percent while posing minimal risk to groundwater or crops.
