The effects of Rare Earth Element Lan on the activities of cellulose, catalase, peroxidase and superoxide dismutasein in earthworm were carried out by natural soil test. The results indicated that Lan can significantl...The effects of Rare Earth Element Lan on the activities of cellulose, catalase, peroxidase and superoxide dismutasein in earthworm were carried out by natural soil test. The results indicated that Lan can significantly suppress the activity of cellulose. The responses of three enzymes in earthworm to Lan were different, Lan mostly affects catalase activity and inhibited catalase activity throughout the experiment. Peroxidase activity tend to 'promote weakly and inhibited strongly' when short term of exposure to Lan, while 'inhibited weakly and promote strongly' as a function of time. In comparison, Lan had little influence on the activity of superoxide dismutase. The variance analysis results showed that the concentration of Lan significantly affected the activities of cellulose and CAT but had no obvious influence on the activities of SOD and POD. The treatment time and the interactive effect between treatment concentrations and time had very significant effect on the activities of cellulose, SOD, CAT and POD.展开更多
Advantages and disadvantages of three extraction methods （acetone grinding, heating and freezing extraction methods） in determination of chlorophyll a in surface water were compared, and the distribution of chloroph...Advantages and disadvantages of three extraction methods （acetone grinding, heating and freezing extraction methods） in determination of chlorophyll a in surface water were compared, and the distribution of chlorophyll a in the Fenhe River in Taiyuan region was discussed. The results showed that more chlorophyll a was extracted using acetone heating and freezing extraction methods compared with acetone grinding method, and standard deviation （SD） was smaller. Interference of pheophytin a was eliminated, so accuracy of chlorophyll a content was improved. Chlorophyll a content at points 1 # and 2# in the upper reaches of the Fenhe River was lower than that at other points close to residential areas.展开更多
基金Project supported bythe National Natural Science Foundation of China (2002CB410800)
文摘The effects of Rare Earth Element Lan on the activities of cellulose, catalase, peroxidase and superoxide dismutasein in earthworm were carried out by natural soil test. The results indicated that Lan can significantly suppress the activity of cellulose. The responses of three enzymes in earthworm to Lan were different, Lan mostly affects catalase activity and inhibited catalase activity throughout the experiment. Peroxidase activity tend to 'promote weakly and inhibited strongly' when short term of exposure to Lan, while 'inhibited weakly and promote strongly' as a function of time. In comparison, Lan had little influence on the activity of superoxide dismutase. The variance analysis results showed that the concentration of Lan significantly affected the activities of cellulose and CAT but had no obvious influence on the activities of SOD and POD. The treatment time and the interactive effect between treatment concentrations and time had very significant effect on the activities of cellulose, SOD, CAT and POD.
文摘Advantages and disadvantages of three extraction methods （acetone grinding, heating and freezing extraction methods） in determination of chlorophyll a in surface water were compared, and the distribution of chlorophyll a in the Fenhe River in Taiyuan region was discussed. The results showed that more chlorophyll a was extracted using acetone heating and freezing extraction methods compared with acetone grinding method, and standard deviation （SD） was smaller. Interference of pheophytin a was eliminated, so accuracy of chlorophyll a content was improved. Chlorophyll a content at points 1 # and 2# in the upper reaches of the Fenhe River was lower than that at other points close to residential areas.
