scholarly journals Crystal Structure of Locally Available Tassar Fibers Based on Amino Acid Sequence: Using X-Ray Data and LALS Method

2011 ◽  
Vol 2011 ◽  
pp. 1-5
Author(s):  
Parameswara Puttanna ◽  
Somashekar Rudrappa
Keyword(s):  
Crystal And Molecular Structure ◽  
Molecular Model ◽  
Imaging Plate ◽  
Layer Line ◽  
X Ray Diffraction ◽  
X Ray ◽  
Line Spacing ◽  
Processing Software ◽  
Fiber Processing ◽  
Plate System

X-ray diffraction pattern from locally available Tassar fibers was recorded using imaging plate system (Dip-100S). The pattern was used along with fiber processing software to identify the reflections and to compute X-ray intensities. A molecular model was first constructed with standard bond lengths and angles using helical symmetry and layer-line spacing observed in the X-ray pattern. The model was then refined against observed X-ray data using linked-atom least-squares (LALS) method. The crystal and molecular structure of Tassar fibers is reported. It is concluded that the sheet structures formed by hydrogen bonds assume the antipolar-antiparallel arrangement.

scholarly journals Design and performance of imaging-plate system for X-ray diffraction study

1987 ◽  
Vol 43 (a1) ◽  
pp. C272-C272
Author(s):  
Y. Amemiya ◽  
A. Nakagawa ◽  
T. Matsushita ◽  
Y. Satow ◽  
J. Chikawa ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Imaging Plate ◽  
X Ray Diffraction ◽  
X Ray ◽  
And Performance ◽  
Plate System

Rapid small-angle X-ray diffraction of a tonically contracting molluscan smooth muscle recorded with imaging plates

1989 ◽  
Vol 22 (1) ◽  
pp. 72-74 ◽  
Author(s):  
Y. Tajima ◽  
K. Okada ◽  
O. Yoshida ◽  
T. Seto ◽  
Y. Amemiya
Keyword(s):  
Small Angle ◽  
Structural Changes ◽  
High Sensitivity ◽  
Imaging Plate ◽  
Layer Line ◽  
X Ray Diffraction ◽  
Thin Filaments ◽  
X Ray ◽  
Area Detector ◽  
Diffraction Patterns

Small-angle X-ray diffraction patterns from the anterior byssus retractor muscles of Mytilus edulis contracting tonically in response to stimulation with acetylcholine were recorded in a 30 s exposure with synchrotron radiation and a high-sensitivity X-ray area detector called an imaging plate. The 190 Å layer line from the thin filaments increased in intensity with increase in tonic tension up to 6 x 104 kg m−2. Above this value, the layer-line intensity remained almost constant and comparable to that for a contracting skeletal muscle, indicating that the same structural changes of the thin filaments occur in both muscles.

scholarly journals X-ray diffraction patterns from chondroitin 4-sulphate, dermatan sulphate and heparan sulphate (Short Communication)

1973 ◽  
Vol 133 (3) ◽  
pp. 605-606.1 ◽  
Author(s):  
E. D. T. Atkins ◽  
T. C. Laurent
Keyword(s):  
Short Communication ◽  
Heparan Sulphate ◽  
Layer Line ◽  
X Ray Diffraction ◽  
Dermatan Sulphate ◽  
Acid Moiety ◽  
Sodium Salts ◽  
X Ray ◽  
Line Spacing ◽  
Diffraction Patterns

Ordered conformations from the sodium salts of chondroitin 4-sulphate, dermatan sulphate and heparan sulphate were observed by X-ray diffraction. Chondroitin 4-sulphate shows similar threefold helical character to that previously reported for chondroitin 6-sulphate and hyaluronates. Dermatan sulphate forms an eightfold helix with an axial rise per disaccharide of 0.93nm, which favours the l-iduronic acid moiety in the normal C1 chair form. The layer-line spacing and axial projection in heparan sulphate of 1.86nm favours a tetrasaccharide repeat with glycosidic linkages alternating β-d-(1→4) and α-d-(1→4).

Design and performance of an imaging plate system for X-ray diffraction study

1988 ◽  
Vol 266 (1-3) ◽  
pp. 645-653 ◽  
Author(s):  
Yoshiyuki Amemiya ◽  
Tadashi Matsushita ◽  
Atsushi Nakagawa ◽  
Yoshinori Satow ◽  
Junji Miyahara ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Imaging Plate ◽  
X Ray Diffraction ◽  
X Ray ◽  
And Performance ◽  
Plate System

Crystal and molecular structure of diorganoammonium oxalatotrimethylstannate, [R2NH2][Me3Sn(C2O4)] (R=i-Bu, cyclohexyl)

2011 ◽  
Vol 34 (5-6) ◽  
pp. 127-130 ◽  
Author(s):  
Yaya Sow ◽  
Libasse Diop ◽  
Kieran C. Molloy ◽  
Gabrielle Kociok-Köhn
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bonds ◽  
Diffraction Study ◽  
Crystal And Molecular Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trigonal Bipyramidal ◽  
Trans Complex ◽  
A Chain ◽  
Distorted Trigonal Bipyramidal

Abstract The title compounds [R2NH2][C2O4SnMe3](R=i-Bu, Cy), in which tin atoms adopt a distorted trigonal bipyramidal configuration, have been prepared and submitted to an X-ray diffraction study. These compounds have been obtained from the reaction of (Cy2NH2)2C2O4·H2O or (i-Bu2NH2)2C2O4 with SnMe3Cl. In both [R2NH2][C2O4SnMe3] compounds, the trans complex has an almost regular trigonal bipyramidal geometry around the tin atom. The SnMe3 residues are connected as a chain with bridging oxalate anions in a trans-SnC3O2 framework, the oxygen atoms being in axial positions. The cations connect linear adjacent chains through NH…O hydrogen bonds giving layered structures.

scholarly journals Iterative regularity and parent-offspring growth mold of stable grain array in bismuth silicate micro-crystals

2011 ◽  
Vol 43 (1) ◽  
pp. 105-112
Author(s):  
Z.G. Zhang ◽  
X.F. Wang ◽  
Q.Q. Tian
Keyword(s):  
Environmental Scanning Electron Microscopy ◽  
Morphological Properties ◽  
Environmental Scanning ◽  
X Ray Diffraction ◽  
Bismuth Silicate ◽  
X Ray ◽  
Offspring Growth ◽  
Line Spacing ◽  
Array Structure ◽  
Sintering Method

Bismuth silicate micro-crystals with grain array structure were prepared by sintering method under atmosphere pressure. The samples were characterized for structural and surface morphological properties by X-ray diffraction (XRD) and Environmental scanning electron microscopy (ESEM). The result shows that stable grain arrays grow by iterative mode. If a stable grain array eliminates, a new stable grain array will generate. In a stable parent array, an offspring array may generate after the corresponding partial elimination of its parent array. If one part of an offspring array stops growing, it will be as a new parent array, and then its offspring grain array will create. The sum of the lengths of an offspring array and the corresponding eliminated part of its parent array is equal to the length of the next eliminated part of its parent array. It means the growth rate of an offspring array is equal to that of the corresponding survived part of its parent array. There is a highly correlation between grain array length and average grain line spacing. It means that larger average grain line spacing corresponds to the stable grain array with lager length. When average grain line spacing increases 1?m, the corresponding array length will increase approximately 7.6?m.

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