Raman and Wide-Angle X-Ray Diffraction Studies on Molecular Structure, Crystallinity, and Morphology of Uncompatibilized and Compatibilized Blends of High Molecular Weight Polyethylene/Nylon 12

2005 ◽  
Vol 220 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Harumi Sato ◽  
Misayo Isogai ◽  
Shigehiro Sasao ◽  
Kimihiro Matsukawa ◽  
Yasuo Kita ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nylon 12 ◽  
Compatibilized Blends

scholarly journals Crystallization and preliminary X-ray diffraction analysis of the high molecular weight ketoacyl reductase FabG4 complexed with NADH

2012 ◽  
Vol 68 (7) ◽  
pp. 786-789 ◽  
Author(s):  
Debajyoti Dutta ◽  
Sudipta Bhattacharyya ◽  
Amit Kumar Das
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Reductase Activity ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cell Parameters ◽  
Complex Crystal ◽  
Rotation Function ◽  
Second Peak

FabG4 fromMycobacterium tuberculosisbelongs to the high molecular weight ketoacyl reductases (HMwFabGs). The enzyme requires NADH for β-ketoacyl reductase activity. The protein was overexpressed, purified to homogeneity and crystallized as a FabG4–NADH complex. A mountable FabG4:NADH complex crystal diffracted to 2.59 Å resolution and belonged to space groupP1, with unit-cell parametersa= 63.07,b= 71.03,c= 92.92 Å, α = 105.02, β = 97.06, γ = 93.66°. The Matthews coefficient suggested the presence of four monomers in the unit cell. In addition, a self-rotation function revealed the presence of two twofold NCS axes and one fourfold NCS axis. At χ = 180° the highest peak corresponds to the twofold NCS between two monomers, whereas the second peak corresponds to the twofold NCS between two dimers.

scholarly journals Study of resistance of ultra-high molecular weight polyethylene to mechanochemical and radiation exposure

2021 ◽  
Vol 340 ◽  
pp. 01007
Author(s):  
Kamila M. Khassenova ◽  
Sergey V. Vosmerikov
Keyword(s):  
Molecular Weight ◽  
Radiation Exposure ◽  
Mechanical Activation ◽  
High Molecular Weight ◽  
High Energy ◽  
Polymer Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Crystallography ◽  
Ultra High Molecular Weight

Ultra-high molecular weight polyethylene is a promising composite material to protect against ionizing radiation. The effect of mechanical activation and radiation exposure on the polymer structure has been studied. Mechanical activation of ultra-high molecular weight polyethylene was carried out for 30 s, 1, and 2 min in a high-energy water-cooled planetary ball mill AGO-2, followed by its further investigation using X-ray diffraction, X-ray crystallography, IR spectroscopy, scanning electron microscopy, and differentialscanning calorimetry.

FTIR and WAXD Study of Regenerated Silk Fibroin

2013 ◽  
Vol 677 ◽  
pp. 211-215 ◽  
Author(s):  
Edwin Kamalha ◽  
Yuan Sheng Zheng ◽  
Yong Chun Zeng ◽  
Mutua N. Fredrick
Keyword(s):  
Molecular Weight ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Secondary Structure ◽  
Bombyx Mori ◽  
Silk Fibroin ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Regenerated Silk Fibroin

In this study, regenerated Bombyx Mori (B. Mori ) silk fibroin from two aqueous solvents was analyzed for structural deviations. Results from Fourier transform infrared spectroscopy (FTIR) and Wide angle x-ray diffraction (WAXD) implied great alteration in the secondary structure, crystallinity and molecular weight due to the regeneration process.

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