Effects of Co2+ on fluoresence emission spectra at room temperature,activity of DCIP photoreduction and polypeptide compositions of thylakoid membrane were studied.The results showed that fluoresence emission spectra ...Effects of Co2+ on fluoresence emission spectra at room temperature,activity of DCIP photoreduction and polypeptide compositions of thylakoid membrane were studied.The results showed that fluoresence emission spectra at room temperature was changed after Co2+treatment: intrinsic fluoresence spectra at room temperature upon excitation at 278 nm and 295 nm was decreased at the Co2+concentration below 15 mmol/L and increased at the Co2+concentration above 15 mmol/L;Chlorophyll fluoresence spectra at room temperature upon excitation at 436 nm and 475 nm was decreased;The inhibition of DCIP photoreduction activity and the changes of polypeptide compositons of the thylakoid membrane were observed as a result of Co2+ treatment.展开更多
海洋沉积物中重金属的活性形态对于指示沉积物污染状况具有重要作用,为探寻简洁且能够有效提取重金属活性形态的浸提方法,实验研究了0.1mol/L和1mol/L盐酸的单级提取和欧共体标准局(European Community Bureau of Reference)提出的BCR...海洋沉积物中重金属的活性形态对于指示沉积物污染状况具有重要作用,为探寻简洁且能够有效提取重金属活性形态的浸提方法,实验研究了0.1mol/L和1mol/L盐酸的单级提取和欧共体标准局(European Community Bureau of Reference)提出的BCR分级提取法对胶州湾表层沉积物中重金属(Cr、Cu、Ni、Pb、Zn)和Al、Fe、Mn的浸取效果。结果显示,3种提取方法提取的金属含量呈显著正相关关系,两种浓度的稀盐酸对BCR方法中的酸可提取态和可还原态金属均具有较好浸提效果,但对可氧化态金属浸提能力相对较弱。不同提取方法的人为信号指数(ASI)计算结果表明,BCR浸取法提取结果的金属ASI值最大,表明其对沉积物中金属活性形态提取效率较高;1mol/L HCl提取结果的金属ASI值最低,可能是较高浓度强酸使沉积物较大颗粒内层中"惰性"金属被浸取出来,"增加"了金属活性组分的污染讯息信号;对沉积物中Cu、Pb和Zn而言,0.1mol/L HCl提取结果的ASI值与BCR方法接近。经过Al归一化后,0.1mol/L HCl浸提的重金属含量的空间分布与胶州湾的实际污染状况相吻合,表明0.1mol/L的HCl在一定程度上能够代替复杂的BCR浸取法,此方法可简化重金属活性形态的提取步骤,适合大范围沉积物重金属污染评价。展开更多
基金The Fundamental Research Funds for the Central Universities(GK200901002)Program for Key Science and Techology Innovation Team of Shaanxi Province(2012KCT-21)~~
文摘Effects of Co2+ on fluoresence emission spectra at room temperature,activity of DCIP photoreduction and polypeptide compositions of thylakoid membrane were studied.The results showed that fluoresence emission spectra at room temperature was changed after Co2+treatment: intrinsic fluoresence spectra at room temperature upon excitation at 278 nm and 295 nm was decreased at the Co2+concentration below 15 mmol/L and increased at the Co2+concentration above 15 mmol/L;Chlorophyll fluoresence spectra at room temperature upon excitation at 436 nm and 475 nm was decreased;The inhibition of DCIP photoreduction activity and the changes of polypeptide compositons of the thylakoid membrane were observed as a result of Co2+ treatment.
文摘海洋沉积物中重金属的活性形态对于指示沉积物污染状况具有重要作用,为探寻简洁且能够有效提取重金属活性形态的浸提方法,实验研究了0.1mol/L和1mol/L盐酸的单级提取和欧共体标准局(European Community Bureau of Reference)提出的BCR分级提取法对胶州湾表层沉积物中重金属(Cr、Cu、Ni、Pb、Zn)和Al、Fe、Mn的浸取效果。结果显示,3种提取方法提取的金属含量呈显著正相关关系,两种浓度的稀盐酸对BCR方法中的酸可提取态和可还原态金属均具有较好浸提效果,但对可氧化态金属浸提能力相对较弱。不同提取方法的人为信号指数(ASI)计算结果表明,BCR浸取法提取结果的金属ASI值最大,表明其对沉积物中金属活性形态提取效率较高;1mol/L HCl提取结果的金属ASI值最低,可能是较高浓度强酸使沉积物较大颗粒内层中"惰性"金属被浸取出来,"增加"了金属活性组分的污染讯息信号;对沉积物中Cu、Pb和Zn而言,0.1mol/L HCl提取结果的ASI值与BCR方法接近。经过Al归一化后,0.1mol/L HCl浸提的重金属含量的空间分布与胶州湾的实际污染状况相吻合,表明0.1mol/L的HCl在一定程度上能够代替复杂的BCR浸取法,此方法可简化重金属活性形态的提取步骤,适合大范围沉积物重金属污染评价。