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
中科院分区:
文献类型:
--
作者:
Cornelius,PA;Hochstrasser,RM;Steele,AW
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.
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影响因子:
4.8
作者:
D. Scholler;M. Y. Wang;B. Hoffman
通讯作者:
B. Hoffman
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:
K. Nagai;H. Hori;S. Yoshida;H. Sakamoto;H. Morimoto
通讯作者:
H. Morimoto
DOI:
--
发表时间:
1981
期刊:
影响因子:
--
作者:
D. Doetschman;S. Utterback
通讯作者:
S. Utterback
影响因子:
4.8
作者:
Q. Gibson
通讯作者:
Q. Gibson