About Omics Group

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About Omics Group

• OMICS Group International through its Open Access
  Initiative is committed to make genuine and
  reliable contributions to the scientific
  community. OMICS Group hosts over 400
  leading-edge peer reviewed Open Access Journals
  and organize over 300 International Conferences
  annually all over the world. OMICS Publishing
  Group journals have over 3 million readers and
  the fame and success of the same can be
  attributed to the strong editorial board which
  contains over 30000 eminent personalities that
  ensure a rapid, quality and quick review process. 

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About Omics Group conferences

• OMICS Group signed an agreement with more than
  1000 International Societies to make healthcare
  information Open Access. OMICS Group Conferences
  make the perfect platform for global networking
  as it brings together renowned speakers and
  scientists across the globe to a most exciting
  and memorable scientific event filled with much
  enlightening interactive sessions, world class
  exhibitions and poster presentations
• Omics group has organised 500 conferences,
  workshops and national symposium across the major
  cities including SanFrancisco,Omaha,Orlado,Rayleig
  h,SantaClara,Chicago,Philadelphia,Unitedkingdom,Ba
  ltimore,SanAntanio,Dubai,Hyderabad,Bangaluru and
  Mumbai.

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• Leonas Valkunas
• Institute of Physics, Center for Physical
  Sciences and Technology, Vilnius, Lithuania
• Chair of Theoretical Physics Faculty of Physics,
  Vilnius University, Lithuania
• Current research interests
• Excitation and charge transfer in photosynthesis,
  
• Spectroscopy of molecular structures and
  biological macromolecules,
• Nonlinear optics and spectroscopy,
• Disordered solid states
• Exciton theory

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• Leonas Valkunas
• Publications
•  N. Holt, D. Zigmantas, L. Valkunas, X.-P. Li, K.
  Niyogi and G. R. Fleming. Carotenoid cation
  formation and the regulation of photosynthetic
  light harvesting. Science 307, 433-436, 2005.
• Y.-Z. Ma, L. Valkunas, S. L. Dexheimer, S. M.
  Bachilo, G. R. Fleming. Femtosecond spectroscopy
  of optical excitations in single-walled carbon
  nanotubes evidence for exciton-exciton
  annihilation. Phys. Rev. Lett. 94, 157402, 2005.
• C. D. P. Duffy, L. Valkunas, A. P. Ruban.
  Light-harvesting processes in the dynamic
  photosynthetic antenna. Perspective. Phys. Chem.
  Chem. Phys. 15, 18752, 2013.
• F. D. Fuller, J. Pan, A. Gelzinis, V. Butkus, S.
  S. Senlik, D. E. Wilcox, C. F. Yokum, L.
  Valkunas, D. Abramavicius, J. P. Ogilvie.
  Vibronic coherence in oxigenic photosynthesis.
  Nature Chemistry. Online 13 July, 2014 (doi
  10.1038/nchem.2005).
• E. Belgio, E. Kapitonova, J. Chmeliov, C. D. P.
  Duffy, P. Ungerer, L. Valkunas, A. V. Ruban.
  Economic photoprotection in photosystem II that
  retains a complete light-harvesting system with
  slow energy traps. Nature Communications. Online
  11 July, 2014 (doi 101038/ncomms.5433).
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• Books
• H. van Amerongen, L.Valkunas, R. van Grondelle.
  Photosynthetic excitons. World Scientific.
  Singapore, New Jersey, London, Hong Kong, 590 p.
  2000.
• L. Valkunas, D. Abramavicius, T. Mancal.
  Molecular excitation dynamics and relaxation.
  Quatum theory and spectroscopy. Wiley-VCH,
  Weinheim, p. 445, 2013.

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Excitation Migration, Quenching and Regulation of
Photosynthetic Light Harvesting

• Leonas Valkunas
• Institute of Physics, Center for Physical
  Sciences and Technology, Vilnius, Lithuania
• Chair of Theoretical Physics Faculty of Physics,
  Vilnius University, Lithuania

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Single molecule spectroscopy of the LHCII trimer
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Fluorescence traces
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Model potential surfaces of states
Describes fast intramolecular vibrations
Describes slow structural changes of protein
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Modeling results
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Fluorescence from variously-sized PSIIs
0.01 a-DM
Caffarri et al. Biophys. J. 20111002094-2103
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Data Analysis Scheme
664 nm

Chlbulk

k1
k2
k3

Chl-
Zea
Chl-Zea
Chl-Zea
?an
k4
Holt, N. E. Zigmantas, D. Et al. Science 2005,
307, 433-436.
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Fluctuating antenna model

• Ideal 2D square lattice
• The lack of connectivity at some antenna points
  may be accounted by fractional dimension d

Diffusion limit
Diffusion limit
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L. Valkunas, D. Abramavicius, and T. Mancal
Molecular Excitation Dynamics and Relaxation
Quantum Theory and Spectroscopy
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2D photon echo spectroscopy

• Scheme

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Purely electronic/vibrational systems
Vibrational monomer
Vibrational monomer
Electronic dimer
Electronic dimer
V. Butkus et al. CPL 545 (2012)
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Effects of the inhomogeneous disorder on
coherences
sD50 cm-1
sD20 cm-1

• The amplitude of the electronic-character beats
  is dramatically reduced by the disorder
• Vibrational-character beats weakly depend on the
  disorder

sD0
?0600 cm-1 ?E850 cm-1 s1s20.05
sD200 cm-1
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2D spectrum of the PSII RC at 77K at a waiting
time of 170 fs.
F. D. Fuller et al. Vibronic coherence in
oxygenic photosynthesis. Nature Chemistry DOI
10.1038/nchem.2005 (2014)
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Exciton Dynamics in Semiconducting Carbon
Nanotubes

• Leonas Valkunas
• Center for Physical Sciences and Technology,
  Vilnius and Department of Theoretical Physics at
  Vilnius University, Lithuania

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Comparison of the E1 and E2 kinetics and their
intensity dependence
Y.-Z. Ma et al., Phys. Rev. Lett. 94 (2005)
157402
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Theoretical description of exciton-exciton
annihilation
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Let Us Meet Again

• We welcome all to our future group conferences of
  Omics group international
• Please visit
• www.omicsgroup.com
• www.Conferenceseries.com
• http//optics.conferenceseries.com/