Ultrafast relaxation in picosecond photolysis of nitrosylhemoglobin.

Ultrafast relaxation in picosecond photolysis of nitrosylhemoglobin.
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亚硝酰血红蛋白皮秒光解的超快弛豫。

DOI:
10.1016/0022-2836(83)90032-3
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发表时间:
1983
影响因子:
5.6
通讯作者:
Steele,AW
Steele,AW
中科院分区:
生物学2区
文献类型:
--
作者:
Cornelius,PA;Hochstrasser,RM;Steele,AW

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我们成功地观测到人亚硝基血红蛋白的皮秒瞬态差谱。样品(23 °C)用353 nm处的~8 ps、~ 10 μJ脉冲激发,该脉冲产生具有双分量衰减的瞬变:第一分量近似为指数衰减,τ = 17 ± 4 ps,而第二分量弱得多,近似为τ = 100 ps。在稍低的温度(4 °C)下,光谱和时间依赖性基本不变。与我们以前对碳氧血红蛋白和氧合血红蛋白的观察相反,我们发现亚硝基血红蛋白中没有长寿命的光产物。我们初步将17 ± 4ps的衰变归因于成对复合。这些结果,结合我们以前在HbO 2+和HbCO中的工作,表明5 ns > gt >5 ps的成对复合速率通过系列HbCO <HbO 2 < HbNO增加。我们注意到,微秒复合率HbCO <HbO 2> HbNO和动力学协同比HbCO > HbO 2> HbNO也有趋势。一个“关键onbarrier”模型,提供了一个一致的表示这些结果。我们认为,自旋轨道效应可能是一个主要的贡献,表现出不同的重组特性的三个配体。
We report the successful observation of a picosecond transient difference spectrum in human nitrosylhemoglobin. The sample (23 °C) is excited with an ~8 ps, ~ 10 μJ pulse at 353 nm that generates a prompt transient having a two-component decay: the first is approximately exponential with τ = 17 ± 4 ps, whereas the second is much weaker with an approximate τ = 100 ps. At slightly lower temperature (4 °C), the spectrum and time dependence are essentially unchanged. In contrast to our previous observations on carboxyhemoglobin and oxyhemoglobin, we find no longlived photoproduct in nitrosylhemoglobin. We tentatively attribute the 17 ± 4 ps decay to geminate recombination. These results, in conjunction with our previous work in HbO2†and HbCO, show that the rate of geminate recombination for 5 ns > gt >5 ps increases through the series HbCO < HbO2< HbNO. We note that trends are also seen for microsecond recombination rates HbCO < HbO2≈ HbNO and for the kinetic co-operativity ratio HbCO > HbO2> HbNO. A “critical onbarrier” model is presented that provides a consistent representation of these results. We suggest that spin-orbit effects could be a major contribution to the different recombination characteristics exhibited by the three ligands.
DOI: --
发表时间: 1979
影响因子: 4.8
作者:
D. Scholler;M. Y. Wang;B. Hoffman
通讯作者: B. Hoffman
DOI: 10.1016/0022-2836(75)90382-4
发表时间: 1975-01-01
影响因子: 5.6
作者:
CASSOLY, R;GIBSON, QH
通讯作者: GIBSON, QH
DOI: --
发表时间: 1978
期刊:
影响因子: --
作者:
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亚硝酰血红蛋白及其单晶化学的电子顺磁共振研究
DOI: --
发表时间: 1981
期刊:
影响因子: --
作者:
D. Doetschman;S. Utterback
通讯作者: S. Utterback
氧与血红蛋白的反应以及盐对氧结合影响的动力学基础。
DOI: --
发表时间: 1970
影响因子: 4.8
作者:
Q. Gibson
通讯作者: Q. Gibson