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Leaving Groups02:14

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The nature of leaving groups strongly influences the outcome of a nucleophilic substitution reaction.
In general, in a nucleophilic substitution reaction, a nucleophile displaces a functional group, called the leaving group, from the substrate to give a substituted product. A leaving group departs the substrate molecule through heterolytic cleavage, taking the pair of electrons with it to become a relatively stable weak base in the form of an anion or a neutral molecule.  
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Time-resolved fluorescence measurements on leaves: principles and recent developments.

Volha U Chukhutsina1, Alfred R Holzwarth1, Roberta Croce2

  • 1Biophysics of Photosynthesis, Department of Physics and Astronomy, Faculty of Science, Vrije Universiteit Amsterdam and LaserLaB Amsterdam, 1081 HV, Amsterdam, The Netherlands.

Photosynthesis Research
|November 28, 2018
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Time-resolved fluorescence spectroscopy now enables real-time measurement of early photosynthesis in intact leaves. This technique overcomes previous challenges, offering new insights into photosynthetic regulation and energy flow dynamics.

Keywords:
FluorescenceLeafRe-absorptionTime-resolved spectroscopy

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Area of Science:

  • Plant Biology
  • Biophysics
  • Photosynthesis Research

Background:

  • Photosynthesis begins with photon absorption by pigments, followed by energy transfer to reaction centers for electron transfer.
  • These early processes occur on femtosecond to nanosecond timescales and are typically studied using time-resolved fluorescence spectroscopy.
  • Measuring these dynamics in intact leaves is challenging due to optical properties like heterogeneity, scattering, and high optical density.

Purpose of the Study:

  • To describe a current methodology for time-resolved fluorescence measurements on intact leaves.
  • To address challenges and solutions for accurate fluorescence kinetics measurements in leaves.
  • To demonstrate how this technique enhances understanding of photosynthetic protein organization, function, and energy flow.

Main Methods:

  • Utilizing time-resolved fluorescence spectroscopy for measurements in the picosecond to nanosecond time range.
  • Developing and applying methods to overcome optical artefacts in intact leaf measurements.
  • Presenting an example measurement on Zea mays leaves.

Main Results:

  • Successfully adapted time-resolved fluorescence spectroscopy for intact leaf measurements.
  • Identified and addressed sources of alteration in fluorescence kinetics.
  • Demonstrated the potential for enriched understanding of photosynthetic dynamics in vivo.

Conclusions:

  • Time-resolved fluorescence spectroscopy is a viable method for studying rapid photosynthetic events in intact leaves.
  • This technique provides crucial data for understanding structure-function relationships and physiological regulation in photosynthesis.
  • Further application of this method will deepen insights into energy flow and protein dynamics within intact photosynthetic tissues.