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南方科技大学公共卫生及应急管理学院2025级博士研究生招生报考通知
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3.5  反应时间对体系荧光的影响
固定其它条件,考察BCDO-DNA体系在2、5、10、15、20、25、30(时间单位为min,数值从小到大,即由a→g)范围内7个不同时间对BCDO-DNA体系荧光猝灭的影响,结果如图3.12和3.13所示。
根据图3.12和3.13测定的荧光强度作BCDO-DNA体系荧光猝灭强度ΔF随时间变化的曲线。结果如图3.14所示。
由图3.14可知,体系的荧光猝灭值ΔF大约在DNA加入5min之后才趋于平稳。由此可知,小牛胸腺DNA与BCDO在六次甲基四胺-HCl缓冲溶液中大约5min反应基本完成。所以依照2.2.4(1)的步骤,在加入DNA后,让体系静置大约5~10min左右使BCDO与DNA反应基本完全后再进行测定。
3.6 溶剂对体系荧光的影响
由于BCDO不溶于水,乙醇在这个体系中作为溶剂,所以需要固定BCDO和DNA的浓度,以及缓冲溶液的酸度,考察溶剂乙醇在2、5、10、15、20、25、30(单位为%,数值从小到大,即由a→g)范围内7个不同体积分数对BCDO-DNA体系荧光猝灭的影响,结果如图3.15和3.16所示。
根据图3.15和3.16测定的荧光强度作BCDO-DNA体系荧光猝灭强度ΔF随溶剂变化的曲线。结果如图3.17所示。由图3.17可知,当乙醇的量保持在10%以下时,它对体系的影响较小,随着乙醇用量的增加,对体系会产生较为严重的影响。
3.7  溶液温度对体系荧光的影响
在实验中,固定其它条件考察溶液温度(T)在20、25、30、35、40、45、50、60(温度单位为℃,数值从小到大,即由a→h)范围内8个不同温度对BCDO-DNA体系荧光猝灭的影响,结果如图3.18和3.19所示。
根据图3.18和3.19测定的荧光强度作BCDO-DNA体系荧光猝灭强度ΔF随温度(T)变化的曲线。结果如图3.20所示,实验只需要在室温条件下进行测定。
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lina8804: 金币+50, 翻译EPI+1, ★★★很有帮助 2012-05-03 09:20:01
3.5 The influence of reaction time to system fluorescence
Fixing other conditions ,we inspected the fluorescence quench of system of BCDO-DNA in 2,5,10,15,20,25,30 minutes ,and the results figured in 3.12 and 3.13 .
According to the figure of 3.12 and 3.13 ,we draw the fluorescence quench intensity with the changing of time ,which showed in figure 3.14 .
According to the figure of 3.14 ,the system of fluorescence quench value would be balance after 5min of putting into DNA .We knew that the DNA of calf and BCDO would react completely after 5min of putting into HMTA-HCl .Therefore ,we let the system settled  5-10min after putting into DNA ,and then we detected the system .
3.6 The influence of solvent to the system fluorescence   
As a result of BCDO didn’t solve in water ,we set ethanol as solvent .We settled the concentration of BCDO and DNA ,and acidity of buffer solution ,then we inspected the fluorescence quench of system of BCDO-DNA in 2,5,10,15,20,25,30 % ,and the results figured in 3.15 and 3.16 .
According to the figure of 3.15 and 3.16 ,we draw the fluorescence quench intensity with the changing of concentration ,which showed in figure 3.17 .
According to the figure of 3.17 ,when the content of ethanol under 10% ,it had little influence in system ,but it had a serious effect with the increase of ethanol .
3.7 The influence of temperature to the system fluorescence
Fixing other conditions ,we inspected the fluorescence quench of system of BCDO-DNA in 20,25,30,35,40,45,50,60℃ ,and the results figured in 3.18 and 3.19 .
According to the figure of 3.18 and 3.19 ,we draw the fluorescence quench intensity with the changing of temperature ,which showed in figure 3.20 .The result just measured in room temperature .
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