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[Fizinfo] Ortvay kollokvium javitott


Chronological Thread 
  • From: Szommer Peter <szpl AT metal.elte.hu>
  • To: fizinfo AT lists.kfki.hu
  • Subject: [Fizinfo] Ortvay kollokvium javitott
  • Date: Tue, 24 May 2011 16:17:24 +0200
  • List-archive: <http://mailman.kfki.hu/pipermail/fizinfo>
  • List-id: ELFT HÍRADÓ <fizinfo.lists.kfki.hu>

ELTE Fizikai Intézet

ORTVAY KOLLOKVIUM

2011. május 26., csütörtök, 15 órakor
Az ELTE Pázmány Péter s. 1/A alatti épületében
a földszinti 0.81 előadóban

Rienk van Grondelle (VU University, Amsterdam)
"Ultrafast Excitation Energy Transfer and the Mechanism
of Non-Phtochemical Quenching in Plant Photosynthesis"

Kivonatos ismertetés:
The success of photosynthesis relies on two ultrafast processes: excitation
energy transfer in the light-harvesting antenna followed by charge separation in the reaction center. LHCII, the peripheral light-harvesting complex of Photosystem II, plays a major role. At the same time, the same light-harvesting
system can be 'switched' into a quenching state, which effectively protects the reaction center of Photosystem II from over-excitation and photodamage. In this talk I will demonstrate how LHCII collects and transfers excitation energy.
Using single molecule spectroscopy we have discovered how LHCII can switch between this light-harvesting state, a quenched state and a red-shifted state.
We show that the switching properties between the light-harvesting state and the quenched state depend strongly on the environmental conditions, where the quenched state is favoured under 'NPQ-like' conditions. It is argued that this is the mechanism of non-photochemical quenching in plants.



  • [Fizinfo] Ortvay kollokvium javitott, Szommer Peter, 05/24/2011

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