Dichroism of Dyes in the Stretched PVA Sheet. II. The Relation between the Optical Density Ratio and the Stretch Ratio, and an Attempt to Analyse Relative Directions of Absorption Bands

Tanizaki, Yoshié

doi:10.1246/bcsj.32.75

Cited by 50 publications

(13 citation statements)

References 12 publications

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“…All the films were prepared under laboratory conditions with access to daylight. Detailed description of the film preparation is given in [18,19].…”

Section: Methodsmentioning

confidence: 99%

Isomerization of Diphenyl Polyenes. Part V. The Origin of Fluorescence of l,6-Diphenyl-1,3,5-hexatriene in Poly (vinyl alcohol) Films

Kawski

Kubicki

Kukliński

et al. 1993

Zeitschrift Für Naturforschung A

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The effect of temperature on the absorption and fluorescence spectra of l,6-diphenyl-l,3,5-hexatriene (DPH) was investigated in three different polymer films: polyvinyl chloride) (PVCh), polyvinyl formal) (PVF) and polyvinyl alcohol) (PVA) in the temperature range 296-423 K. Anomalous behaviour of the fluorescence intensity was observed only for DPH in non-heated PVA film. The intensity distribution in the fluorescence band of DPH in both non-heated and heated PVCh and PVF films was found to be independent of the excitation light wavelength, A exc . The behaviour of DPH is similar in the PVA film heated to 423 K. For these samples, single exponential fluorescence decay was observed. The behaviour of non-heated DPH samples in PVA is quite different, the intensity distribution and the fluorescence band position depending strongly on ^. exc and the fluorescence decay being double exponential. It can be inferred that the fluorescence of DPH in a non-heated PVA sample consists of two components, the first originating from the all-trans conformer and the second from the ground-state s-eis conformer.

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“…All the films were prepared under laboratory conditions with access to daylight. Detailed description of the film preparation is given in [18,19].…”

Section: Methodsmentioning

confidence: 99%

Isomerization of Diphenyl Polyenes. Part V. The Origin of Fluorescence of l,6-Diphenyl-1,3,5-hexatriene in Poly (vinyl alcohol) Films

Kawski

Kubicki

Kukliński

et al. 1993

Zeitschrift Für Naturforschung A

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“…Isotropic PVA films were prepared at room temper ature by the method described in previous papers [16][17][18], introducing the substances under investiga tion into aqueous PVA solution through methanol.…”

Section: Methodsmentioning

confidence: 99%

Isomerization of Diphenyl Polyenes

Kawski

Gryczyński

et al. 1991

Zeitschrift Für Naturforschung A

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We describe an unusual temperature dependence of l,8-diphenyl-l,3,5,7-octatetraene absorption in polyvinyl alcohol) films. Upon heating above 80 °C, the optical density (in the long wavelength region) of this compound increases rapidly. A sample heated to 150 °C has a nearly twenty times higher optical density than a non-heated sample. This effect is not reversible: Once the sample is heated it retains its absorbance on cooling to room temperature. In our opinion, the effect has its origin in changes of the chromophore molecules from eis to trans conformation at the high temper ature. Possible applications of these unique material properties should be improved temperature sensors, optical data storage, non-developed high resolution photography or typing, etc.

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“…In the flow experiments, S g is calculated using an orientation distribution model for rigid ellipsoidal particles in laminar flow (see Supporting Information for details). In the PVA gel, S g is determined by a distribution model for uniaxial stretch deformation (29,30). There is a significant difference between the two alignment methods: The stretch angular distribution does not depend on the length of the particles, whereas the hydrodynamic model does, and the longer the particles the better their flow orientation.…”

Section: Principles For Determining the Orientation Of Chromophores Imentioning

confidence: 99%

Orientation of aromatic residues in amyloid cores: Structural insights into prion fiber diversity

Reymer

Frederick

Rocha

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Structural conversion of one given protein sequence into different amyloid states, resulting in distinct phenotypes, is one of the most intriguing phenomena of protein biology. Despite great efforts the structural origin of prion diversity remains elusive, mainly because amyloids are insoluble yet noncrystalline and therefore not easily amenable to traditional structural-biology methods. We investigate two different phenotypic prion strains, weak and strong, of yeast translation termination factor Sup35 with respect to angular orientation of tyrosines using polarized light spectroscopy. By applying a combination of alignment methods the degree of fiber orientation can be assessed, which allows a relatively accurate determination of the aromatic ring angles. Surprisingly, the strains show identical average orientations of the tyrosines, which are evenly spread through the amyloid core. Small variations between the two strains are related to the local environment of a fraction of tyrosines outside the core, potentially reflecting differences in fibril packing.linear dichroism | polarized light | prion proteins | Sup35 strains | tyrosine

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Dichroism of Dyes in the Stretched PVA Sheet. II. The Relation between the Optical Density Ratio and the Stretch Ratio, and an Attempt to Analyse Relative Directions of Absorption Bands

Cited by 50 publications

References 12 publications

Isomerization of Diphenyl Polyenes. Part V. The Origin of Fluorescence of l,6-Diphenyl-1,3,5-hexatriene in Poly (vinyl alcohol) Films

Isomerization of Diphenyl Polyenes. Part V. The Origin of Fluorescence of l,6-Diphenyl-1,3,5-hexatriene in Poly (vinyl alcohol) Films

Isomerization of Diphenyl Polyenes

Orientation of aromatic residues in amyloid cores: Structural insights into prion fiber diversity

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