Results 201 to 210 of about 17,729 (255)

Vibrational Circular Dichroism of Protein Films

Journal of the American Chemical Society, 2004
Vibrational circular dichroism (VCD) spectra in the 1800-1400 cm(-)(1) region have been measured for the first time for protein films prepared from aqueous buffer solutions. These measurements demonstrate several advantages of significant importance.
Ganesh, Shanmugam, Prasad L, Polavarapu
openaire   +2 more sources

Quantum-Cascade Laser-Based Vibrational Circular Dichroism

Journal of the American Chemical Society, 2011
Vibrational circular dichroism (VCD) spectra were recorded with a tunable external-cavity quantum-cascade laser (QCL). In comparison with standard thermal light sources in the IR, QCLs provide orders of magnitude more power and are therefore promising for VCD studies in strongly absorbing solvents.
Lüdeke, Steffen, Pfeifer, Marcel, Fischer, Peer   +2 more
openaire   +4 more sources

A Vibrational Circular Dichroism Microsampling Accessory: Mapping Enhanced Vibrational Circular Dichroism in Amyloid Fibril Films

Applied Spectroscopy, 2017
We report the first vibrational circular dichroism (VCD) measurement of spatial heterogeneity in a sample using infrared (IR) microsampling. Vibrational circular dichroism spectra are typically measured using a standard IR cell with an IR beam diameter of 10 mm or greater making it impossible to investigate the spatial heterogeneity of a solid film ...
Xuefang, Lu, Honggang, Li, Jordan W, Nafie, Tomáš, Pazderka, Markéta, Pazderková, Rina K, Dukor, Laurence A, Nafie   +6 more
openaire   +2 more sources

Vibrational Circular Dichroism

Applied Spectroscopy Reviews, 1981
Abstract Since the first discovery by Biot and Pasteur that some molecules rotate the polarization of light, this optical activity has been recognized to be a consequence of molecular structure [1]. In fact, natural optical activity is one of the most structurally sensitive techniques available to the spectroscopist and, hence, has been extensively ...
openaire   +1 more source

Vibrational Circular Dichroism Of Proteins

SPIE Proceedings, 1989
We have measured VCD spectra of more than 20 proteins in the amide I' region. These data show an enhanced sensitivity to the differences in these globular proteins as compared to UV.CD. Factor analysis correlates with the a and β composition.
Petr Pancoska, Sritana C. Yasui, Timothy A. Keiderling   +2 more
openaire   +1 more source

Vibrational circular dichroism beyond solutions

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Since the first vibrational circular dichroism (VCD) experiments conducted in the early 1970s, VCD spectroscopy has significantly advanced and firmly established itself in various fields of modern science and technology. For example, it became one of the preferred methods for absolute configuration determination in the pharmaceutical industry ...
Monika Krupová, Valery Andrushchenko
openaire   +3 more sources

Rotational—vibrational circular dichroism

Chemical Physics Letters, 1989
Abstract Experimental rotational—vibrational circular dichroism (RVCD) spectra are presented for methyloxirane. These spectra were obtained at 1 cm−1 resolution in the ≈ 1500-650 cm−1 region. It is found that the circular dichroism sign associated with the Q branch is opposite to those of the P and R branches for some vibrational bands. These unusual
openaire   +1 more source

Vibrational circular dichroism of monosaccharides

Carbohydrate Research, 1999
Abstract Vibrational absorption and circular dichroism spectra of several monosaccharides in the 1500–1180 cm −1 region are presented. The spectra are analyzed for similarities and differences among anomeric, homomorphic and epimeric pairs of sugars.
Pranati K Bose, Prasad L Polavarapu
openaire   +1 more source

Film Techniques for Vibrational Circular Dichroism Measurements

Applied Spectroscopy, 2005
Vibrational circular dichroism (VCD) spectra in the 1800–900 cm−1region have been measured recently for protein films and for carbohydrate films prepared from aqueous solutions. In addition to the advantages of avoiding the interference from strong infrared absorption of water at 1650 cm−1and requiring a two-orders-of-magnitude-smaller amount of sample
Ganesh, Shanmugam, Prasad L, Polavarapu
openaire   +2 more sources

Exciton Chirality Method in Vibrational Circular Dichroism

Journal of the American Chemical Society, 2012
The interaction of two IR chromophores yields a strong vibrational circular dichroism couplet whose sign reflects the absolute configuration of the molecule. We present a method to determine absolute configuration of a chiral molecule based on this couplet without need of theoretical calculation. Not only can this method analyze various molecules whose
Taniguchi, Tohru, Monde, Kenji
openaire   +3 more sources