The humic acid contents in drinking water and soil in Kaschin-Beck disease areas were found more than that of non-disease areas in this research. Changes of free radical concentration in drinking water were agreed wit...The humic acid contents in drinking water and soil in Kaschin-Beck disease areas were found more than that of non-disease areas in this research. Changes of free radical concentration in drinking water were agreed with that of humic acid contents in drinking water of Kaschin-Beck disease areas. A positive correlation of free radical concentration and humic acid content in drinking water has been shown (r=0.913) . The structure of I. R. spectra of humic acid under ultraviolet light has been changed. Thus it indicated that free radical was resulted from benzoqiunonyl groups of humic acid in environment.展开更多
Humic acids, especially FA in fractions, contain more oxygen functional groups. In this experiment, on the basis of confirming the action of humic acids on KBD, what was studied is the biological effects of one of mai...Humic acids, especially FA in fractions, contain more oxygen functional groups. In this experiment, on the basis of confirming the action of humic acids on KBD, what was studied is the biological effects of one of main oxygen functional groups, hydroxy group (-OH). The results indicate that inducing pathologic process of KBD, obviously decrease the GSH-Px activity and induce peroxidation membrane injury of tissue. The SOD activity increase in the tissues caused by oxygen functional groups showed that enhancing of free radical reaction should not be neglected.展开更多
为了探求大气CO2浓度升高对土壤腐殖质及其组成的影响,为大气CO2浓度升高条件下土壤生物化学过程的变化提供依据,通过稻-麦轮作FACE(Free-air CO2 enrichment)平台研究了正常施氮水平下水稻土壤有机碳及其各组分对大气CO2浓度升高...为了探求大气CO2浓度升高对土壤腐殖质及其组成的影响,为大气CO2浓度升高条件下土壤生物化学过程的变化提供依据,通过稻-麦轮作FACE(Free-air CO2 enrichment)平台研究了正常施氮水平下水稻土壤有机碳及其各组分对大气CO2浓度升高的响应。研究结果表明:不同土层的腐殖质组分含量有所差异,表层(0~15cm)土壤腐殖化程度较高,表层的土壤有机碳(SOC)、水溶性碳(WSOC)、胡敏酸(HA)、富里酸(FA)、胡敏素(HM)数量均高于下层(15~30cm)。大气CO2浓度升高,增加了表层和下层的SOC,促进了土壤有机质的积累;使表层WSOC有增加趋势,但对下层没有显著影响;降低了土壤中可提取腐殖物质中HA的比例(PQ),土壤的腐殖化度下降,有利于HA的分解与转化和FA的积累;对土壤HM没有显著影响。展开更多
Kaschin-Beck disease (KBD) could be exogeneous free radical induced endemic osteoarthropathy under conditions of lacking necessary antioxidant defences.especially selenium-cored defence in Chinese eco-en-vironment. Ex...Kaschin-Beck disease (KBD) could be exogeneous free radical induced endemic osteoarthropathy under conditions of lacking necessary antioxidant defences.especially selenium-cored defence in Chinese eco-en-vironment. Experimental evidences have been provided for the internal relations among previously suggested pathologic factors, i.e., selenium deficiency, organic matters of drinking waterand mycotoxins from contaminated grains, based on the facts that the former is a preventory factor while the others are exogenous freeradical carriers. ESR spectrum shows that these exogenous free radical carriers have a property of semi-quinone compounds and are toxic in in-vitro cartilage cell culture and animal tests in inducing lipid peroxidation process.展开更多
文摘The humic acid contents in drinking water and soil in Kaschin-Beck disease areas were found more than that of non-disease areas in this research. Changes of free radical concentration in drinking water were agreed with that of humic acid contents in drinking water of Kaschin-Beck disease areas. A positive correlation of free radical concentration and humic acid content in drinking water has been shown (r=0.913) . The structure of I. R. spectra of humic acid under ultraviolet light has been changed. Thus it indicated that free radical was resulted from benzoqiunonyl groups of humic acid in environment.
文摘Humic acids, especially FA in fractions, contain more oxygen functional groups. In this experiment, on the basis of confirming the action of humic acids on KBD, what was studied is the biological effects of one of main oxygen functional groups, hydroxy group (-OH). The results indicate that inducing pathologic process of KBD, obviously decrease the GSH-Px activity and induce peroxidation membrane injury of tissue. The SOD activity increase in the tissues caused by oxygen functional groups showed that enhancing of free radical reaction should not be neglected.
文摘为了探求大气CO2浓度升高对土壤腐殖质及其组成的影响,为大气CO2浓度升高条件下土壤生物化学过程的变化提供依据,通过稻-麦轮作FACE(Free-air CO2 enrichment)平台研究了正常施氮水平下水稻土壤有机碳及其各组分对大气CO2浓度升高的响应。研究结果表明:不同土层的腐殖质组分含量有所差异,表层(0~15cm)土壤腐殖化程度较高,表层的土壤有机碳(SOC)、水溶性碳(WSOC)、胡敏酸(HA)、富里酸(FA)、胡敏素(HM)数量均高于下层(15~30cm)。大气CO2浓度升高,增加了表层和下层的SOC,促进了土壤有机质的积累;使表层WSOC有增加趋势,但对下层没有显著影响;降低了土壤中可提取腐殖物质中HA的比例(PQ),土壤的腐殖化度下降,有利于HA的分解与转化和FA的积累;对土壤HM没有显著影响。
文摘Kaschin-Beck disease (KBD) could be exogeneous free radical induced endemic osteoarthropathy under conditions of lacking necessary antioxidant defences.especially selenium-cored defence in Chinese eco-en-vironment. Experimental evidences have been provided for the internal relations among previously suggested pathologic factors, i.e., selenium deficiency, organic matters of drinking waterand mycotoxins from contaminated grains, based on the facts that the former is a preventory factor while the others are exogenous freeradical carriers. ESR spectrum shows that these exogenous free radical carriers have a property of semi-quinone compounds and are toxic in in-vitro cartilage cell culture and animal tests in inducing lipid peroxidation process.