scholarly journals Chemical and Structural Analysis of Carbon Materials Subjected to Alkaline Oxidation

ACS Omega ◽  
2019 ◽  
Vol 4 (20) ◽  
pp. 18725-18733 ◽  
Author(s):  
Filipa R. F. Simoes ◽  
Edy Abou-Hamad ◽  
Jasmin Smajic ◽  
Nitin M. Batra ◽  
Pedro M. F. J. Costa
Keyword(s):  
Structural Analysis ◽  
Carbon Materials ◽  
Alkaline Oxidation

scholarly journals Research And Characterization Of Cu – Graphene, Cu-CNT’s Composites Obtained By Mechanical Synthesis

2015 ◽  
Vol 60 (3) ◽  
pp. 1929-1934
Author(s):  
P. Kwaśniewski ◽  
G. Kiesiewicz ◽  
T. Knych ◽  
A. Mamala ◽  
M. Gniełczyk ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Structural Analysis ◽  
Carbon Materials ◽  
Base Material ◽  
Cold Drawing ◽  
Copper Matrix ◽  
Synthesis Process ◽  
Drawing Process ◽  
Mechanical Synthesis ◽  
Carbon Particles

Abstract Currently we can observe a worldwide trend to find new materials with extraordinary properties. In particular these researches are aimed to find a method to improve electrical conductivity, mechanical properties, corrosion resistance and rheological behavior of known materials. This effect can be achieved by a synthesis of modern carbon materials with metals. In this paper authors presented research results of synthesis process for Cu-graphene and Cu-CNT’s composites obtained by the mechanical synthesis in cold drawing process. The article presents also the results of electrical conductivity measurements and structural analysis of carbon particles presence in copper matrix. The research has shown that obtained composites have electrical conductivity lower than used copper base material. Additionally, the structural analysis has shown that after the drawing process carbon materials particles are mechanically pressed into Cu in the matrix, and these particles do not participate in the current flow, creating an actual barrier for electrons transport.

scholarly journals Structural Analysis of Carbon Materials with Low Crystallinity

TANSO ◽  
2000 ◽  
Vol 2000 (194) ◽  
pp. 261-267 ◽  
Author(s):  
Noriko Yoshizawa
Keyword(s):  
Structural Analysis ◽  
Carbon Materials ◽  
Low Crystallinity

Structural analysis of the surface-layer protein of spirillum serpens by high-resolution electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 738-739
Author(s):  
W. H. Wu ◽  
R. M. Glaeser
Keyword(s):  
Electron Microscopy ◽  
Surface Layer ◽  
Structural Analysis ◽  
High Resolution ◽  
Low Dose ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Surface Layer Protein ◽  
Morphological Unit ◽  
Resolution Electron

Spirillum serpens possesses a surface layer protein which exhibits a regular hexagonal packing of the morphological subunits. A morphological model of the structure of the protein has been proposed at a resolution of about 25 Å, in which the morphological unit might be described as having the appearance of a flared-out, hollow cylinder with six ÅspokesÅ at the flared end. In order to understand the detailed association of the macromolecules, it is necessary to do a high resolution structural analysis. Large, single layered arrays of the surface layer protein have been obtained for this purpose by means of extensive heating in high CaCl2, a procedure derived from that of Buckmire and Murray. Low dose, low temperature electron microscopy has been applied to the large arrays.As a first step, the samples were negatively stained with neutralized phosphotungstic acid, and the specimens were imaged at 40,000 magnification by use of a high resolution cold stage on a JE0L 100B. Low dose images were recorded with exposures of 7-9 electrons/Å2. The micrographs obtained (Fig. 1) were examined by use of optical diffraction (Fig. 2) to tell what areas were especially well ordered.

RNA polymerase: Preparation and structural analysis of helical polymers

1984 ◽  
Vol 42 ◽  
pp. 152-153
Author(s):  
E. Loren Buhle ◽  
Pamela Rew ◽  
Ueli Aebi
Keyword(s):  
Structural Analysis ◽  
Rna Polymerase ◽  
Molecular Level ◽  
X Ray Diffraction ◽  
Helical Polymers ◽  
X Ray ◽  
E Coli ◽  
The Past ◽  
Ordered Arrays ◽  
Low Ionic Strength

While DNA-dependent RNA polymerase represents one of the key enzymes involved in transcription and ultimately in gene expression in procaryotic and eucaryotic cells, little progress has been made towards elucidation of its 3-D structure at the molecular level over the past few years. This is mainly because to date no 3-D crystals suitable for X-ray diffraction analysis have been obtained with this rather large (MW ~500 kd) multi-subunit (α2ββ'ζ). As an alternative, we have been trying to form ordered arrays of RNA polymerase from E. coli suitable for structural analysis in the electron microscope combined with image processing. Here we report about helical polymers induced from holoenzyme (α2ββ'ζ) at low ionic strength with 5-7 mM MnCl2 (see Fig. 1a). The presence of the ζ-subunit (MW 86 kd) is required to form these polymers, since the core enzyme (α2ββ') does fail to assemble into such structures under these conditions.

Sign in / Sign up

Export Citation Format

Share Document