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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Molecular Shot Noise, Burst Size Distribution, and Single-Molecule Detection in Fluid Flow: Effects of Multiple Occupancy
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Molecular Shot Noise, Burst Size Distribution, and Single-Molecule Detection in Fluid Flow: Effects of Multiple Occupancy

机译:流体中的分子散粒噪声,爆发大小分布和单分子检测:多重占用的影响

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摘要

We present a new mathematical approach for calculating burst size distributions for the detection of fluorescent molecules introduced into a fluid flow at different rates. The burst size distributions reflect the passage of more than one molecule through the detection volume in close succession. The calculations are based upon a physical model appropriate for the fluorophore phycoerythrin under the conditions of no saturation of excitation, negligible triplet-state dynamics, and negligible detector dead time. The model includes photophysical properties of the fluorophore phycoerythrin (absorption cross section, fluorescence quantum yield, and photostability); diffusion; sample stream hydrodynamics; spatially dependent optical detection efficiency; and excitation laser beam characteristics. Good agreement is found between the mathematical model and experimental results with phycoerythrin.
机译:我们提出了一种新的数学方法,用于计算突发大小分布,以检测以不同速率引入到流体流中的荧光分子。猝发尺寸分布紧密连续地反映了一个以上的分子通过检测体积。该计算基于在不饱和激发,可忽略的三态态动力学和可忽略的检测器死时间的条件下适合于荧光团藻红蛋白的物理模型。该模型包括荧光团藻红蛋白的光物理性质(吸收截面,荧光量子产率和光稳定性);扩散;样品流流体动力学空间相关的光学检测效率;和激发激光束特性。在藻红蛋白的数学模型和实验结果之间找到了很好的一致性。

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