Theoretical Insights on O2and CO Adsorption on Neutral and Positively Charged Gold Clusters

2006 ◽  
Vol 110 (25) ◽  
pp. 12240-12248 ◽  
Author(s):  
Antonio Prestianni ◽  
Antonino Martorana ◽  
Frédéric Labat ◽  
Ilaria Ciofini ◽  
Carlo Adamo
Keyword(s):  
Co Adsorption ◽  
Gold Clusters ◽  
Positively Charged

Theoretical study of CO adsorption on yttrium-doped gold clusters AunY (n=1–9)

2010 ◽  
Vol 498 (4-6) ◽  
pp. 296-301 ◽  
Author(s):  
Ling Lin ◽  
Peter Lievens ◽  
Minh Tho Nguyen
Keyword(s):  
Theoretical Study ◽  
Co Adsorption ◽  
Gold Clusters

CO adsorption on pure and binary-alloy gold clusters: A quantum chemical study

2006 ◽  
Vol 125 (19) ◽  
pp. 194707 ◽  
Author(s):  
Ajay M. Joshi ◽  
Mark H. Tucker ◽  
W. Nicholas Delgass ◽  
Kendall T. Thomson
Keyword(s):  
Binary Alloy ◽  
Quantum Chemical ◽  
Co Adsorption ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Gold Clusters

Very low rate constants of bimolecular CO adsorption on anionic gold clusters: Implications for catalytic activity

2003 ◽  
Vol 5 (6) ◽  
pp. 1213-1218 ◽  
Author(s):  
Iulia Balteanu ◽  
O. Petru Balaj ◽  
Brigitte S. Fox ◽  
Martin K. Beyer ◽  
Zdeněk Bastl ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rate Constants ◽  
Co Adsorption ◽  
Gold Clusters ◽  
Low Rate

CO Adsorption on Gold Clusters Stabilized on Ceria−Titania Mixed Oxides:  Comparison with Reference Catalysts

2006 ◽  
Vol 110 (46) ◽  
pp. 23329-23336 ◽  
Author(s):  
Floriana Vindigni ◽  
Maela Manzoli ◽  
Anna Chiorino ◽  
Tatyana Tabakova ◽  
Flora Boccuzzi
Keyword(s):  
Mixed Oxides ◽  
Co Adsorption ◽  
Gold Clusters

Theoretical study of AunV-CO, n = 1–14: The dopant vanadium enhances CO adsorption on gold clusters

2012 ◽  
Vol 137 (16) ◽  
pp. 164312 ◽  
Author(s):  
Pham Vu Nhat ◽  
Truong Ba Tai ◽  
Minh Tho Nguyen
Keyword(s):  
Theoretical Study ◽  
Co Adsorption ◽  
Gold Clusters

Protamine-DNA interaction

1978 ◽  
Vol 36 (2) ◽  
pp. 200-201
Author(s):  
D.P. Bazett-Jones ◽  
F.P. Ottensmeyer
Keyword(s):  
Small Volume ◽  
Double Helix ◽  
Dna Interaction ◽  
Dark Field ◽  
Sperm Head ◽  
Nuclear Proteins ◽  
Field Electron Microscopy ◽  
Dark Field Electron ◽  
Dna Double Helix ◽  
Positively Charged

Dark field electron microscopy has been used for the study of the structure of individual macromolecules with a resolution to at least the 5Å level. The use of this technique has been extended to the investigation of structure of interacting molecules, particularly the interaction between DNA and fish protamine, a class of basic nuclear proteins of molecular weight 4,000 daltons.Protamine, which is synthesized during spermatogenesis, binds to chromatin, displaces the somatic histones and wraps up the DNA to fit into the small volume of the sperm head. It has been proposed that protamine, existing as an extended polypeptide, winds around the minor groove of the DNA double helix, with protamine's positively-charged arginines lining up with the negatively-charged phosphates of DNA. However, viewing protamine as an extended protein is inconsistent with the results obtained in our laboratory.

Structure and Interaction of Protamine by Dark Field Electron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 160-161
Author(s):  
D.P. Bazett-Jones ◽  
F.P. Ottensmeyer
Keyword(s):  
Electron Microscopy ◽  
Dark Field ◽  
Amino Acid Sequences ◽  
Dimensional Structure ◽  
3 Dimensional ◽  
Field Electron ◽  
Proposed Model ◽  
Field Electron Microscopy ◽  
Dark Field Electron ◽  
Positively Charged

It has been shown for some time that it is possible to obtain images of small unstained proteins, with a resolution of approximately 5Å using dark field electron microscopy (1,2). Applying this technique, we have observed a uniformity in size and shape of the 2-dimensional images of pure specimens of fish protamines (salmon, herring (clupeine, Y-l) and rainbow trout (Salmo irideus)). On the basis of these images, a model for the 3-dimensional structure of the fish protamines has been proposed (2).The known amino acid sequences of fish protamines show stretches of positively charged arginines, separated by regions of neutral amino acids (3). The proposed model for protamine structure (2) consists of an irregular, right-handed helix with the segments of adjacent arginines forming the loops of the coil.

Crystal structure images of large gold clusters and growing crystals by HRTEM

1984 ◽  
Vol 42 ◽  
pp. 428-429
Author(s):  
L.R. Wallenberg ◽  
J.-O. Bovin ◽  
G. Schmid
Keyword(s):  
Crystal Structure ◽  
Nucleation And Growth ◽  
Close Packing ◽  
Gold Clusters ◽  
Molecular Weight Determination ◽  
Growth Mechanisms ◽  
Starting Point ◽  
Different Types ◽  
Nucleation And Growth Mechanisms ◽  
Points Of View

Metallic clusters are interesting from various points of view, e.g. as a mean of spreading expensive catalysts on a support, or following heterogeneous and homogeneous catalytic events. It is also possible to study nucleation and growth mechanisms for crystals with the cluster as known starting point.Gold-clusters containing 55 atoms were manufactured by reducing (C6H5)3PAuCl with B2H6 in benzene. The chemical composition was found to be Au9.2[P(C6H5)3]2Cl. Molecular-weight determination by means of an ultracentrifuge gave the formula Au55[P(C6H5)3]Cl6 A model was proposed from Mössbauer spectra by Schmid et al. with cubic close-packing of the 55 gold atoms in a cubeoctahedron as shown in Fig 1. The cluster is almost completely isolated from the surroundings by the twelve triphenylphosphane groups situated in each corner, and the chlorine atoms on the centre of the 3x3 square surfaces. This gives four groups of gold atoms, depending on the different types of surrounding.

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