0000000000953981

AUTHOR

Janne Nieminen

showing 2 related works from this author

Excitation Transport in Helical Proteins

1994

Recent results for excitation dynamics in and IR-absorption spectrum of helical polypeptides are briefly reviewed.

PhysicsPhysics::Biological PhysicsQuantitative Biology::BiomoleculesDynamics (mechanics)Astrophysics::Cosmology and Extragalactic Astrophysics02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesMolecular physics3. Good health0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010306 general physics0210 nano-technologyAstrophysics::Galaxy AstrophysicsExcitation
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Anomalous temperature dependence of the IR spectrum of polyalanine

1997

Abstract We have studied the temperature dependence of the infrared spectra of acetanilide (ACN), tryptophan–(alanine) 15 , and tyrosine–(alanine) 15 . No sidebands of the amide-I vibration were observed in the polypeptides, but two anomalous sidebands of the NH stretch with a similar temperature dependence as that of the anomalous amide-I vibrational mode at 1650 cm −1 of crystalline ACN were detected. Fermi resonance combined with the appearance of a red-shifted sideband of NH stretch through coupling to lattice modes seems to explain this band structure. Observations are indicative of excitons that may occur in polypeptides as well as in single crystals of ACN.

AlaninePhysics::Biological PhysicsQuantitative Biology::BiomoleculesSidebandChemistryExcitonGeneral Physics and AstronomyInfrared spectroscopy02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesMolecular physics3. Good healthchemistry.chemical_compoundNuclear magnetic resonanceLattice (order)0103 physical sciencesFermi resonancePhysical and Theoretical Chemistry010306 general physics0210 nano-technologyElectronic band structureAcetanilideChemical Physics Letters
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