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Title: Absence of Sum Frequency Generation in Support of Orthorhombic Symmetry of α-Chitin

Authors:
 [1];  [2];  [1];  [2]
  1. Univ. Grenoble Alpes, Cermav, F-38000 Grenoble, France; CNRS-Cermav, F-38000 Grenoble, France
  2. Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Lignocellulose Structure and Formation (CLSF)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1388042
DOE Contract Number:
SC0001090
Resource Type:
Journal Article
Resource Relation:
Journal Name: Macromolecules; Journal Volume: 49; Journal Issue: 18; Related Information: CLSF partners with Pennsylvania State University (lead); North Carolina State University; University of Rhode Island; Virginia Tech University
Country of Publication:
United States
Language:
English
Subject:
biofuels (including algae and biomass), bio-inspired, membrane, carbon sequestration, materials and chemistry by design, synthesis (self-assembly)

Citation Formats

Ogawa, Yu, Lee, Christopher M., Nishiyama, Yoshiharu, and Kim, Seong H. Absence of Sum Frequency Generation in Support of Orthorhombic Symmetry of α-Chitin. United States: N. p., 2016. Web. doi:10.1021/acs.macromol.6b01583.
Ogawa, Yu, Lee, Christopher M., Nishiyama, Yoshiharu, & Kim, Seong H. Absence of Sum Frequency Generation in Support of Orthorhombic Symmetry of α-Chitin. United States. doi:10.1021/acs.macromol.6b01583.
Ogawa, Yu, Lee, Christopher M., Nishiyama, Yoshiharu, and Kim, Seong H. 2016. "Absence of Sum Frequency Generation in Support of Orthorhombic Symmetry of α-Chitin". United States. doi:10.1021/acs.macromol.6b01583.
@article{osti_1388042,
title = {Absence of Sum Frequency Generation in Support of Orthorhombic Symmetry of α-Chitin},
author = {Ogawa, Yu and Lee, Christopher M. and Nishiyama, Yoshiharu and Kim, Seong H.},
abstractNote = {},
doi = {10.1021/acs.macromol.6b01583},
journal = {Macromolecules},
number = 18,
volume = 49,
place = {United States},
year = 2016,
month = 9
}
  • Three starting materials, Hf /SUB l-x/ Zr /SUB x/ O/sub 2/ (x=0.24, 0.50, 0.74), were prepared and treated at 600/sup 0/C and 6 GPa for 30 min. X-ray powder diffraction patterns of the products indicated only orthorhombic HfO/sub 2/. The lattice parameters increased linearly as x approached 1 (ZrO/sub 2/); a continuous solid-solution series was observed.
  • HIV/SIV Nef mediates many cellular processes through interactions with various cytoplasmic and membrane-associated host proteins, including the signalling subunit of the T-cell receptor (TCR{zeta}). Here, the crystallization strategy, methods and refinement procedures used to solve the structures of the core domain of the SIVmac239 isolate of Nef (Nef{sub core}) in complex with two different TCR{zeta} fragments are described. The structure of SIVmac239 Nef{sub core} bound to the longer TCR{zeta} polypeptide (Leu51-Asp93) was determined to 3.7 {angstrom} resolution (R{sub work} = 28.7%) in the tetragonal space group P4{sub 3}2{sub 1}2. The structure of SIVmac239 Nef{sub core} in complex with the shortermore » TCR{zeta} polypeptide (Ala63-Arg80) was determined to 2.05 {angstrom} resolution (R{sub work} = 17.0%), but only after the detection of nearly perfect pseudo-merohedral crystal twinning and proper assignment of the orthorhombic space group P2{sub 1}2{sub 1}2{sub 1}. The reduction in crystal space-group symmetry induced by the truncated TCR{zeta} polypeptide appears to be caused by the rearrangement of crystal-contact hydrogen-bonding networks and the substitution of crystallographic symmetry operations by similar noncrystallographic symmetry (NCS) operations. The combination of NCS rotations that were nearly parallel to the twin operation (k, h, -l) and a and b unit-cell parameters that were nearly identical predisposed the P2{sub 1}2{sub 1}2{sub 1} crystal form to pseudo-merohedral twinning.« less
  • A new method has been proposed for determining the magnetic resonance parameters (g-values, line widths) from the EPR spectra of vitrified solutions and powders of species with orthorhombic symmetry of the g value and spin S = 1/2. The method has an accuracy comparable with that of computer modeling of the spectra, and at the same time is extremely simple, since it does not require complex mathematical calculations. The approach is based on the expansion of the integral expression describing the vitreous EPR spectrum into a rapidly converging series from which analytical expressions are obtained. Comparison of the approximate spectramore » with spectra modeled using a computer showed good agreement. The analytical expressions have been used to obtain a number of simple rules (not requiring a computer) for obtaining magnetic resonance parameters from the spectra with a good accuracy.« less