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A new method for the quantitative determination of the percentage of intramolecular H‐bonds, based on Fourier transform infrared techniques, is applied to the conformational analysis of a series of synthetic peptides spanning the processing site of the ocytocin and neurophysin precursor. Even...
Fluorescence spectroscopy and surface‐enhanced Raman spectroscopy (SERS) were applied to study the interaction of the antitumoral drug 9‐aminoacridine (9AA) with a trypsin‐like protease guanidinobenzoatase (GB) extracted from a mouse Erlich tumor. As a consequence of this interaction, a...
In our continuing series of measurements of the complex index of refraction for representative samples of biological materials, we measured ovalbumin (egg albumin) over the spectral region from 0.130 (76,923 cm−1) to 2.50 μm (4000 cm−1). Films of ovalbumin suitable for optical analyses were...
Fourier transform infrared (FTIR) experiments in dimethylsulfoxide, a solvent incapable of H donation, demonstrate that H → D isotopic replacement on the amide side of peptide bonds involves modifications of both the position and intensity of the amide I band. The effect of the isotopic...
Circular dichroism spectroscopy and other methods are used to show that the addition of dimethylsulfoxide causes reversible folding of the (GA)10 strand of DNA into an ordered single‐stranded conformer. The ordered conformer melts in a cooperative way and it does not contain protonated adenine....
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