The effective group potential, a new method for the study of spectrum in large molecules: Tests and perspectives

2002 ◽  
Vol 116 (12) ◽  
pp. 4829 ◽  
Author(s):  
Jean-Louis Heully ◽  
Romuald Poteau ◽  
Sandra Berasaluce ◽  
Fabienne Alary
Keyword(s):  
New Method ◽  
Large Molecules ◽  
Effective Group

A new method for modelling spectator chemical groups in ab initio calculations: effective group potentials

2000 ◽  
Vol 104 (3-4) ◽  
pp. 174-178 ◽  
Author(s):  
Fabienne Alary ◽  
Romuald Poteau ◽  
Jean-Louis Heully ◽  
Jean-Claude Barthelat ◽  
Jean-Pierre Daudey
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
New Method ◽  
Effective Group ◽  
Chemical Groups

Programmed filtration, a new method for removing large molecules and regulating albumin leakage during hemodiafiltration treatment

2001 ◽  
Vol 38 (4) ◽  
pp. S220-S223 ◽  
Author(s):  
Sung-Teh Kim ◽  
Chieko Yamamoto ◽  
Masahiro Taoka ◽  
Masayuki Takasugi
Keyword(s):  
New Method ◽  
Large Molecules ◽  
Albumin Leakage

MSINDO-sCIS: A New Method for the Calculation of Excited States of Large Molecules

2011 ◽  
Vol 7 (11) ◽  
pp. 3675-3685 ◽  
Author(s):  
Immanuel Gadaczek ◽  
Katharina Krause ◽  
Kim Julia Hintze ◽  
Thomas Bredow
Keyword(s):  
Excited States ◽  
New Method ◽  
Large Molecules

The low-resolution 3D-structure of porin, a channel-forming protein in E. coliouter membranes

1983 ◽  
Vol 41 ◽  
pp. 440-441
Author(s):  
A. Engel ◽  
D.L. Dorset ◽  
A. Massalski ◽  
J.P. Rosenbusch
Keyword(s):  
Crystal Packing ◽  
3D Structure ◽  
Gram Negative Bacteria ◽  
Protein Ratio ◽  
Crystal Forms ◽  
Large Molecules ◽  
Functional Studies ◽  
Voltage Dependent ◽  
Planar Membranes ◽  
Hexagonal Arrays

Porins represent a group of channel forming proteins that facilitate diffusion of small solutes across the outer membrane of Gram-negative bacteria, while excluding large molecules (>650 Da). Planar membranes reconstituted from purified matrix porin (OmpF protein) trimers and phospholipids have allowed quantitative functional studies of the voltage-dependent channels and revealed concerted activation of triplets. Under the same reconstitution conditions but using high protein concentrations porin aggregated to 2D lattices suitable for electron microscopy and image processing. Depending on the lipid-to- protein ratio three different crystal packing arrangements were observed: a large (a = 93 Å) and a small (a = 79 Å) hexagonal and a rectangular (a = 79 Å b = 139 Å) form with p3 symmetry for the hexagonal arrays. In all crystal forms distinct stain filled triplet indentations could be seen and were found to be morphologically identical within a resolution of (22 Å). It is tempting to correlate stain triplets with triple channels, but the proof of this hypothesis requires an analysis of the structure in 3 dimensions.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
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