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[求助] 光活化的专业术语理解

1. Due to moderate uncaging cross-sections (daUu where da is the absorption cross-section and Uu the uncaging quantum yield) described for the usual photoremovable
groups, two-photon fluorescence uncaging, has been sparingly described in the literature by contrast to two-photon fluorescence excitation。其中, cross-sections怎么解释。
2. A main difference between two-photon fluorescence uncaging and two-photon fluorescence excitation is that, in the former case, the excitation process will be independently triggered by standard excitation allowing subsequent biophysical experiments (single molecule fluorescence tracking, bleaching, etc.).这句话完全不理解, two-photon fluorescence uncaging和two-photon fluorescence excitation的区别到底在哪?求大神详解
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