scholarly journals Conformation of an Arabinoxylan Isolated from the Rice Endosperm Cell Wall by X-Ray Diffraction and a Conformational Analysis

1995 ◽  
Vol 59 (6) ◽  
pp. 965-968 ◽  
Author(s):  
Toshifumi Yui ◽  
Kiyohisa Imada ◽  
Naoto Shibuya ◽  
Kozo Ogawa
Keyword(s):  
Cell Wall ◽  
Conformational Analysis ◽  
Endosperm Cell ◽  
X Ray Diffraction ◽  
Rice Endosperm ◽  
X Ray

scholarly journals Conformational analysis of phloroglucinols from hypericum Brasiliense by using x-ray diffraction and molecular modeling

2010 ◽  
Vol 21 (5) ◽  
pp. 837-841 ◽  
Author(s):  
Kátia Z. Leal ◽  
Julliane D. Yoneda ◽  
Eric B. Lindgren ◽  
Carlos B. Pinheiro ◽  
Arthur L. Corrêa ◽  
...  
Keyword(s):  
Molecular Modeling ◽  
Conformational Analysis ◽  
X Ray Diffraction ◽  
X Ray

Fine structure in the red algae - II. The structure of the cell wall of Rhodymenia Palmata

1959 ◽  
Vol 150 (941) ◽  
pp. 447-455 ◽  
Keyword(s):  
Cell Wall ◽  
Chemical Treatment ◽  
Amorphous Matrix ◽  
Dry Weight ◽  
Wall Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Floridean Starch ◽  
Thin Sectioning ◽  
Paper Chromatographic Separation

The cell-wall structure of the red alga Rhodymenia palmata has been examined by the methods of X -ray diffraction analysis and electron microscopy, including ultra-thin sectioning. The cell wall is shown to consist of numerous lamellae each of which is made up of unoriented, crystalline microfibrils embedded in an amorphous matrix of other cell-wall constituents. The material can be stretched reversibly up to 100% when wet, and the stretching induces orientation of the microfibrils. The ‘∝ cellulose' fraction, which accounts for only 2 to 7 % of the original dry weight, was isolated chemically and was analyzed by means of hydrolysis and paper chromatographic separation of the resulting sugars, and it was found to be composed of approximately equal quantities of glucose and xylose residues. Chemical treatment of the cell wall was found to cause considerable variations in the X -ray diagrams, which are discussed. It is concluded that the microfibrils contain both glucose and xylose residues in approximately equal proportions and that chemical treatment in this case causes changes in crystallinity of the structural component of the wall. The importance of these findings for the meaning of the term cellulose is discussed. The X -ray diagram of older fronds was found to be complicated by the occurrence of extra rings due to the presence of floridean starch, and the highly elastic properties of the thallus enabled the diagrams of the starch and the cell wall to be separated.

Conformational analysis of C3′-substituted pyrimidine nucleosides by X-ray diffraction

1993 ◽  
pp. 276-277
Author(s):  
Dirk Everaert ◽  
Norbert M. Blaton ◽  
Oswald M. Peeters ◽  
Camiel J. de Ranter
Keyword(s):  
Conformational Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pyrimidine Nucleosides

The effects of thermal treatment on the nanomechanical behavior of bamboo (Phyllostachys pubescens Mazel ex H. de Lehaie) cell walls observed by nanoindentation, XRD, and wet chemistry

Holzforschung ◽  
2017 ◽  
Vol 71 (2) ◽  
pp. 129-135 ◽  
Author(s):  
Yanjun Li ◽  
Chengjian Huang ◽  
Li Wang ◽  
Siqun Wang ◽  
Xinzhou Wang
Keyword(s):  
Cell Wall ◽  
Thermal Treatment ◽  
Cell Walls ◽  
Treatment Time ◽  
Lignin Content ◽  
Phyllostachys Pubescens ◽  
X Ray Diffraction ◽  
Wet Chemistry ◽  
X Ray ◽  
Wet Chemical

Abstract The effects of thermal treatment of bamboo at 130, 150, 170, and 190°C for 2, 4, and 6 h were investigated in terms of changes in chemical composition, cellulose crystallinity, and mechanical behavior of the cell-wall level by means of wet chemical analysis, X-ray diffraction (XRD), and nanoindentation (NI). Particularly, the reduced elastic modulus (Er), hardness (H), and creep behavior were in focus. Both the temperature and treatment time showed significant effects. Expectedly, the hemicelluloses were degraded and the relative lignin content was elevated, while the crystallinity of the cellulose moiety was increased upon thermal treatment. The Er and H data of the cell wall were increased after 6 h treatment at 190°C, from 18.4 to 22.0 GPa and from 0.45 to 0.65 GPa, respectively. The thermal treatment led to a decrease of the creep ratio (CIT) under the same conditions by ca. 28%. The indentation strain state (εi) also decreased significantly after thermal treatment during the load-holding stage.

Fine structure in the red algae III. A general survey of cell-wall structure in the red algae

1959 ◽  
Vol 150 (941) ◽  
pp. 456-459 ◽  
Keyword(s):  
Cell Wall ◽  
Red Algae ◽  
Amorphous Matrix ◽  
Cell Wall Structure ◽  
Wall Structure ◽  
X Ray Diffraction ◽  
Cellulose I ◽  
General Survey ◽  
X Ray ◽  
Floridean Starch

A general survey of cell-wall structure in the red algae has been carried out using the methods of X -ray diffraction analysis and electron microscopy. The fifteen species all show a similar wall structure consisting of numerous lamellae each of which is made up of random micro-fibrils embedded in an amorphous matrix. The X -ray diagrams obtained from several species are complicated by the existence of crystalline floridean starch, but nevertheless reveal the absence of cellulose I.

X-ray diffraction, conformational analysis and stereoregularity of a crystalline poly(3-methyl-1, 3-pentadiene)

Polymer ◽  
1992 ◽  
Vol 33 (17) ◽  
pp. 3547-3551 ◽  
Author(s):  
Vincenzo Venditto ◽  
Claudio De Rosa ◽  
Gaetano Guerra ◽  
Roberto Napolitano
Keyword(s):  
Conformational Analysis ◽  
X Ray Diffraction ◽  
X Ray
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