Molecular Model of Fast Atomic Collisions

1992 ◽  
pp. 311-346 ◽  
Author(s):  
A. Riera
Keyword(s):  
Molecular Model ◽  
Atomic Collisions

scholarly journals Charge Exchange Reactions in Astrophysical Plasmas

1983 ◽  
Vol 103 ◽  
pp. 187-197
Author(s):  
R. McCarroll ◽  
P. Valiron ◽  
L. Opradolce
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Molecular Model ◽  
Recent Experimental Data ◽  
Exchange Reactions ◽  
Astrophysical Plasmas ◽  
Atomic Collisions ◽  
Physical Conditions ◽  
Theoretical Approaches ◽  
Basic Features

A review is presented of charge exchange reactions of multiply charged ions with atomic hydrogen and helium at thermal-eV energies, typical of the physical conditions encountered in planetary nebulae. The basic features of the processes are analyzed in the framework of the molecular model of atomic collisions. A discussion is given of the different theoretical approaches to the calculation of the collision cross sections. A comparison with recent experimental data is included.

Offsetting the difficulties of the molecular model of atomic collisions in the intermediate velocity range

1991 ◽  
Vol 43 (7) ◽  
pp. 3578-3586 ◽  
Author(s):  
L. F. Errea ◽  
L. Méndez ◽  
A. Riera
Keyword(s):  
Molecular Model ◽  
Velocity Range ◽  
Atomic Collisions

Ab initio quantum chemistry in the molecular model of atomic collisions

1982 ◽  
Vol 90 (5) ◽  
pp. 299-376 ◽  
Author(s):  
A. Macías ◽  
A. Riera
Keyword(s):  
Quantum Chemistry ◽  
Ab Initio ◽  
Molecular Model ◽  
Atomic Collisions

Toward an alignment of the actin molecule within the actin filament

1983 ◽  
Vol 41 ◽  
pp. 450-451
Author(s):  
P.R. Smith ◽  
W.E. Fowler ◽  
U. Aebi
Keyword(s):  
Actin Filament ◽  
Diffraction Data ◽  
Quantitative Estimate ◽  
Molecular Model ◽  
Quantitative Comparison ◽  
Regulatory Proteins ◽  
Essential Information ◽  
X Ray ◽  
Maximum Resolution ◽  
Lack Of Information

An understanding of the specific interactions of actin with regulatory proteins has been limited by the lack of information about the structure of the actin filament. Molecular actin has been studied in actin-DNase I complexes by single crystal X-ray analysis, to a resolution of about 0.6nm, and in the electron microscope where two dimensional actin sheets have been reconstructed to a maximum resolution of 1.5nm. While these studies have shown something of the structure of individual actin molecules, essential information about the orientation of actin in the filament is still unavailable.The work of Egelman & DeRosier has, however, suggested a method which could be used to provide an initial quantitative estimate of the orientation of actin within the filament. This method involves the quantitative comparison of computed diffraction data from single actin filaments with diffraction data derived from synthetic filaments constructed using the molecular model of actin as a building block. Their preliminary work was conducted using a model consisting of two juxtaposed spheres of equal size.

Exploration of cell wall architecture with the rapid-freeze deep-etch technique

1993 ◽  
Vol 51 ◽  
pp. 128-129
Author(s):  
Béatrice Satiat-Jeunemaitre ◽  
Chris Hawes
Keyword(s):  
Plant Cell ◽  
Cell Walls ◽  
Cell Biology ◽  
Molecular Model ◽  
Three Dimensional ◽  
Secretory Activity ◽  
Wall Structure ◽  
Specimen Preparation ◽  
Molecular Architecture ◽  
Plant Cell Walls

The comprehension of the molecular architecture of plant cell walls is one of the best examples in cell biology which illustrates how developments in microscopy have extended the frontiers of a topic. Indeed from the first electron microscope observation of cell walls it has become apparent that our understanding of wall structure has advanced hand in hand with improvements in the technology of specimen preparation for electron microscopy. Cell walls are sub-cellular compartments outside the peripheral plasma membrane, the construction of which depends on a complex cellular biosynthetic and secretory activity (1). They are composed of interwoven polymers, synthesised independently, which together perform a number of varied functions. Biochemical studies have provided us with much data on the varied molecular composition of plant cell walls. However, the detailed intermolecular relationships and the three dimensional arrangement of the polymers in situ remains a mystery. The difficulty in establishing a general molecular model for plant cell walls is also complicated by the vast diversity in wall composition among plant species.

The development of a molecular model of lung

1970 ◽  
Vol 126 (3) ◽  
pp. 491-495
Author(s):  
H. G. Boren
Keyword(s):  
Molecular Model
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