Journal ArticleDOI
The effect of acids on the infrared spectra of schiff bases—i. non-conjugated imines
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In this paper, the Fourier transform infrared spectra of CHCl3 solutions containing a non-conjugated imine, R1HC=NR2 and an acid of the series HCl, HBr, HI, trichloro-, dichloro, monochloro-monobromo acetic acids and propionic acid have been recorded.Abstract:
The Fourier-transform infrared spectra of CHCl3 solutions containing a non-conjugated imine, R1HC=NR2 and an acid of the series HCl, HBr, HI, trichloro-, dichloro-, monochloro-, monobromo acetic acids and propionic acid have been recorded. Both the N+H and double bond stretching regions are examined. The results show that HCl, HBr and HI protonate the imine completely, trichloroacetic acid to about 90-95%, the other haloacetic acids to 55-80% and propionic acid to <10%. Considered as model studies for the problem of protonation in rhodopsins our results lead to the conclusion that with the relatively weak acids available in the pigments full protonation requires a stabilization mechanism which should be further investigated.read more
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Proton transfer in and proton polarizability of hydrogen bonds: IR and theoretical studies regarding mechanisms in biological systems
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Infrared spectroscopic detection of light-induced change in chloride-arginine interaction in halorhodopsin
TL;DR: It is concluded that a halide-arginine ion pair is present in the hR state; this interaction appears to be disrupted by photoconversion to hL.
Journal ArticleDOI
Anion-protein interactions during halorhodopsin pumping: halide binding at the protonated Schiff base
TL;DR: Halorhodopsin (hR), the light-driven chloride pump of Halobacterium halobium, has been studied by Fourier transform infrared (FTIR) spectroscopy and it is concluded that there is a direct hydrogen-bonded interaction between the Schiff base group and an externally supplied halide ion in the hR state.
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Role of WHO.
TL;DR: This is a paid internship where interns work directly to assist the Director of Marketing and Communications on various tasks relating to upcoming GRA events.
Journal ArticleDOI
Bacteriorhodopsin and Related Pigments of Halobacteria
W Stoeckenius,R A Bogomolni +1 more
Journal ArticleDOI
The Vibrational Spectra of Molecules and Complex Ions in Crystals III. Ammonium Chloride and Deutero‐Ammonium Chloride
E. L. Wagner,D. F. Hornig +1 more
TL;DR: In this paper, the infra-red spectra of thin non-scattering films of NH4Cl and ND4Cl were obtained at 28°, −78° and −190°C.
Journal ArticleDOI
An external point-charge model for wavelength regulation in visual pigments
Barry Honig,Uri Dinur,Koji Nakanishi,Valeria Balogh-Nair,Mary Ann Gawinowicz,Maria Arnaboldi,Michael G. Motto +6 more
Journal ArticleDOI
The action of light on rhodopsin.
Ruth Hubbard,Allen Kropf +1 more
TL;DR: Rhodopsin, a red visual pigment of vertebrate rods, is composed of the yellow carotenoid derivative, retinene, joined to the colorless protein, opsin, which bleaches in the light to a mixture of opsin and all-trans retinenes and opsIn, and the chromophore of squid rhodops in, has the neo-b (1 -cis) configuration.