scholarly journals ON ELECTRONIC SHELLS SURROUNDING CHARGED INSULATED METALLIC CLUSTERS

2005 ◽  
Vol 04 (01) ◽  
pp. 1-30 ◽  
Author(s):  
K. DIETRICH ◽  
M. GARNY ◽  
K. POMORSKI
Keyword(s):  
Surface Layer ◽  
Resonance Structure ◽  
Metallic Cluster ◽  
Metal Core ◽  
Electromagnetic Decay ◽  
Metallic Clusters ◽  
Resonance Behavior ◽  
Positively Charged

We determine the wavefunctions of electrons bound to a positively charged mesoscopic metallic cluster covered by an insulating surface layer. The radius of the metal core and the thickness of the insulating surface layer are of the order of a couple of Ångström. We study, in particular, the electromagnetic decay of externally located electrons into unoccupied internally located states that exhibit a resonance behavior. This resonance structure has the consequence that the lifetime of the "mesoscopic atoms" may vary by up to six orders of magnitude depending on the values of the parameters (from seconds to years).

ON CHARGED INSULATED METALLIC CLUSTERS

2004 ◽  
Vol 13 (01) ◽  
pp. 1-8 ◽  
Author(s):  
K. DIETRICH ◽  
M. GARNY ◽  
K. POMORSKI
Keyword(s):  
Surface Layer ◽  
Resonance Structure ◽  
Metallic Cluster ◽  
Metal Core ◽  
Electromagnetic Decay ◽  
Metallic Clusters ◽  
Eigen Values ◽  
Positively Charged

We determine the wavefunctions and eigen-values of electrons bound to a positively charged mesoscopic metallic cluster covered by an insulating surface layer. The radius of the metal core and the thickness of the insulating surface layer are of the order of a couple of Ångström. We study in particular the electromagnetic decay of externally located electrons into unoccupied internally located states which exhibits a resonance behaviour. This resonance structure has the consequence that the lifetime of the "mesoscopic atoms" may vary by up to 6 orders of magnitude depending on the values of the parameters (from sec to years).

Stability of positively charged metallic clusters

1985 ◽  
Vol 119 (2-3) ◽  
pp. 241-243 ◽  
Author(s):  
S. Mukherjee ◽  
D. Tománek ◽  
K.H. Bennemann
Keyword(s):  
Metallic Clusters ◽  
Positively Charged

Hexacyano octahedral metallic clusters as versatile building blocks in the design of extended polymeric framework and clustomesogens

2014 ◽  
Vol 2 (46) ◽  
pp. 9813-9823 ◽  
Author(s):  
Maria Amela-Cortes ◽  
Stéphane Cordier ◽  
Nikolay G. Naumov ◽  
Cristelle Mériadec ◽  
Franck Artzner ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Building Blocks ◽  
Metallic Cluster ◽  
Intrinsic Properties ◽  
Hybrid Nanomaterials ◽  
Metallic Clusters ◽  
Self Assembling ◽  
Crystal Phases ◽  
Polymeric Framework ◽  
Liquid Crystal Phases

Self-assembling abilities of Katn[M6Qi8(CN)a6] hybrid nanomaterials are tailored by the metallic cluster polyanionic charge while the latter keeps its intrinsic properties within the liquid crystal phases.

Structure of the glycan chain from the surface layer glycoprotein of Bacillus alvei CCM 2051

1991 ◽  
Vol 69 (1) ◽  
pp. 72-78 ◽  
Author(s):  
Eleonora Altman ◽  
Jean-Robert Brisson ◽  
Paul Messner ◽  
Uwe B. Sleytr
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Surface Layer ◽  
Magnetic Resonance ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Resonance Structure ◽  
Nuclear Magnetic Resonance Structure ◽  
Glycan Chain ◽  
Molecular Masses ◽  
Nuclear Magnetic

The cell surface of the mesophilic eubacterium Bacillus alvei CCM 2051 is covered by an oblique arranged surface layer glycoprotein. The subunits revealed by sodium dodecyl sulfate – polyacrylamide gel electrophoresis were distinct bands of molecular masses 140 000, 128 000, and 127 000. Proteolytic degradation of the purified S-layer glycoprotein yielded a single glycopeptide fraction with an apparent molecular mass of ca. 25 000. Methylation analysis in conjunction with two-dimensional nuclear magnetic resonance experiments at 500 MHz established the branched trisaccharide[Formula: see text]as the repeating unit for this glycan chain.Key words: surface layer, eubacteria, glycoprotein, nuclear magnetic resonance, structure.

STUDY OF METALLIC CLUSTERS IN ORGANIC THIN FILMS

1996 ◽  
Vol 03 (01) ◽  
pp. 1029-1032 ◽  
Author(s):  
Z.Q. XUE ◽  
H.J. GAO ◽  
W.M. LIU ◽  
Y.W. LIU ◽  
Q.D. WU ◽  
...  
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Metal Clusters ◽  
Organic Thin Films ◽  
Metallic Materials ◽  
Metallic Cluster ◽  
Metallic Clusters

The polyethylene (PE) and the metallic materials are deposited alternatively on substrates in the chamber of the ICB-TOFMS deposition system. The metallic-cluster-polyethylene thin films are formed. The film thickness is about 30 nm. The structures of these samples including Au-PE, Ag-PE, In-PE, and Sn-PE thin films are studied. These special thin films with suspension metal clusters display many special properties.

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.

The oxidation of Inconel alloy MA754 at low oxidation potential

1983 ◽  
Vol 41 ◽  
pp. 218-219
Author(s):  
D. N. Braski ◽  
P. D. Goodell ◽  
J. V. Cathcart ◽  
R. H. Kane
Keyword(s):  
Surface Layer ◽  
Oxidation Potential ◽  
Metal Interface ◽  
Elevated Temperature Strength ◽  
Surface Conditions ◽  
Inconel Alloy ◽  
Inco Alloy ◽  
Resistance To Oxidation ◽  
Oxide Particles ◽  
Cold Worked

It has been known for some time that the addition of small oxide particles to an 80 Ni—20 Cr alloy not only increases its elevated-temperature strength, but also markedly improves its resistance to oxidation. The mechanism by which the oxide dispersoid enhances the oxidation resistance is being studied collaboratively by ORNL and INCO Alloy Products Company.Initial experiments were performed using INCONEL alloy MA754, which is nominally: 78 Ni, 20 Cr, 0.05 C, 0.3 Al, 0.5 Ti, 1.0 Fe, and 0.6 Y2O3 (wt %).Small disks (3 mm diam × 0.38 mm thick) were cut from MA754 plate stock and prepared with two different surface conditions. The first was prepared by mechanically polishing one side of a disk through 0.5 μm diamond on a syntron polisher while the second used an additional sulfuric acid-methanol electropolishing treatment to remove the cold-worked surface layer. Disks having both surface treatments were oxidized in a radiantly heated furnace for 30 s at 1000°C. Three different environments were investigated: hydrogen with nominal dew points of 0°C, —25°C, and —55°C. The oxide particles and films were examined in TEM by using extraction replicas (carbon) and by backpolishing to the oxide/metal interface. The particles were analyzed by EDS and SAD.

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.

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