光合细菌反应中心的光饱和曲线和量子产率。
Light saturation curves and quantum yields in reaction centers from photosynthetic bacteria.
作者信息
Cho H M, Mancino L J, Blankenship R E
出版信息
Biophys J. 1984 Feb;45(2):455-61. doi: 10.1016/S0006-3495(84)84168-5.
Abstract
Reaction centers isolated from the photosynthetic bacterium Rhodopseudomonas sphaeroides R-26 mutant were irradiated with laser pulses of variable energy and the amount of photooxidation of the primary electron donor bacteriochlorophyll was measured. The resultant light saturation curve fits an exponential function and not a hyperbolic or hyperbolic tangent function. Analysis using either a Poisson statistical model or a simple kinetic model predicts an exponential light saturation curve in the limit where the light pulse is long relative to any transient intermediate states. The absolute quantum yield of photochemistry was found to be 0.98, utilizing the entire light saturation curve. Distortions from the simple exponential light saturation behavior are predicted when very short laser pulses are used.
摘要
从光合细菌球形红假单胞菌R - 26突变体中分离出的反应中心，用不同能量的激光脉冲进行照射，并测量初级电子供体细菌叶绿素的光氧化量。所得的光饱和曲线符合指数函数，而非双曲线或双曲正切函数。使用泊松统计模型或简单动力学模型进行分析预测，在光脉冲相对于任何瞬态中间态较长的极限情况下，会出现指数光饱和曲线。利用整个光饱和曲线，发现光化学的绝对量子产率为0.98。当使用非常短的激光脉冲时，预计会偏离简单的指数光饱和行为。
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