POST DOCTORAL POSITION(S)
in the framework of the EC TMR network program we have one-two post
doctoral openings in the group for work in Photosynthesis with
emphasis on Photosystem II (PSII). The positions are immediately
available. Our current research activities are outlined below.
In parallel with our continuing studies of the acceptor side of PSII
(Sanakis et al JACS 121, 9155-9164 (1999)) a considerable part of our
research effort is devoted recently to the study of the oxygen
evolving complex. Our approach includes the reversible interaction of
small molecules (NO, CN-, …) with the Mn cluster and the tyrosines
but also the straightforward study of integer spin S states. The
chemical modification of Tyr YD to a new radical species has been
described earlier [Sanakis et al. (1997) Biochemistry 36, 1411-1417],
and recently we reported on the formation of a unique intermediate of
the Mn cluster assigned to a Mn(II)-Mn(III) dimer resulting from a
state probably lower than S0 [Goussias et al. (1997) Biochemistry 36,
9261-9266; Sarrou et al. (1998) Biochemistry accelerated 37, March
17, 3581-3587]. We are currently working on the physiological S3
state. We recently submitted an accelerated paper to Biochemistry
reporting a metalloradical EPR signal from this state. The
metalloradical character of the S3 state is supported by flash
fluorescence experiments indicating an unusually fast concerted
reduction by NO to the S1 state (paper in press). A number of
collaborative projects, including EXAFS studies are also in progress
and the candidate will benefit from the interaction with a number of
prominent groups participating in the network.
Our facilities here include EPR spectroscopy (cw and access to pulsed
EPR and ENDOR), flash fluorescence, flash O2 techniques, optical
assay techniques and also, for certain applications, Mossbauer
spectroscopy and magnetic susceptibility. We expect that during the
course of the post doctoral period our facilities will be extended to
higher frequency EPR.
Potential candidates must be EC nationals and should have some
background in Photosynthesis and EPR spectroscopy and/or
flash-fluorescence and flash-oxygen techniques.
Dr Vasili PETROULEAS
Inst. Mat. Sci., NCSR "Democritos"
15310 Aghia Paraskevi Attikis
Greece
phone: (+301) 650 3344. Fax: (+301) 651 9430
e-mail: vpetr at ims.Demokritos.gr
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</smaller>Dr Vasili Petrouleas
e-mail:vpetr at ims.demokritos.gr
Inst. Mat. Sciences / NCSR "Democritos phone: +301 650-3344, 650-3312
15310 Aghia Paraskevi Attikis, Greece Fax: +301 651-9430
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