Determination of one-dimensional crystal structures using the double Patterson function

1983 ◽  
Vol 92 (4-5) ◽  
pp. 385-396
Author(s):  
Peter Main
Keyword(s):  
Crystal Structures ◽  
One Dimensional ◽  
Patterson Function ◽  
Dimensional Crystal

Preparation, spectroscopic and magnetic characterization of Cu(cyclam)M(CN)4 complexes exhibiting one-dimensional crystal structures (cyclam = 1,4,8,11-tetraazacyclotetradecane, M = Ni, Pd, Pt)

2010 ◽  
Vol 35 (6) ◽  
pp. 737-744 ◽  
Author(s):  
Juraj Černák ◽  
Juraj Kuchár ◽  
Monika Stolárová ◽  
Marcela Kajňaková ◽  
Martin Vavra ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Magnetic Characterization ◽  
One Dimensional ◽  
Dimensional Crystal

scholarly journals Ambiguity of structure determination from a minimum of diffraction intensities

2014 ◽  
Vol 70 (4) ◽  
pp. 354-357 ◽  
Author(s):  
Ahmed Al-Asadi ◽  
Dimitri Leggas ◽  
Oleg V. Tsodikov
Keyword(s):  
Crystal Structures ◽  
Structure Determination ◽  
Three Dimensional ◽  
Minimum Data Set ◽  
Intensity Data ◽  
Data Set ◽  
One Dimensional ◽  
Minimum Data ◽  
Minimum Intensity ◽  
Dimensional Crystal

Although the ambiguity of the crystal structures determined directly from diffraction intensities has been historically recognized, it is not well understood in quantitative terms. Bernstein's theorem has recently been used to obtain the number of one-dimensional crystal structures of equal point atoms, given a minimum set of diffraction intensities. By a similar approach, the number of two- and three-dimensional crystal structures that can be determined from a minimum intensity data set is estimated herein. The ambiguity of structure determination from the algebraic minimum of data increases at least exponentially fast with the increasing structure size. Substituting lower-resolution intensities by higher-resolution ones in the minimum data set has little or no effect on this ambiguity if the number of such substitutions is relatively small.

scholarly journals Enumeration of one-dimensional crystal structures obtained from a minimum of diffraction intensities

2012 ◽  
Vol 68 (3) ◽  
pp. 313-318 ◽  
Author(s):  
Ahmed Al-Asadi ◽  
Eugene Chudin ◽  
Oleg V. Tsodikov
Keyword(s):  
Crystal Structures ◽  
One Dimensional ◽  
Dimensional Crystal

scholarly journals Symmetry of diffraction patterns of two-dimensional crystal structures

2021 ◽  
pp. 113336
Author(s):  
Tatiana Latychevskaia ◽  
Recep Zan ◽  
Sergey Morozov ◽  
Kostya S. Novoselov
Keyword(s):  
Crystal Structures ◽  
Two Dimensional ◽  
Diffraction Patterns ◽  
Dimensional Crystal

Improved thin-layer chromatographic determination of phospholipids in gastric aspirate from newborns, for assessment of lung maturity.

1988 ◽  
Vol 34 (4) ◽  
pp. 736-738 ◽  
Author(s):  
D Serrano de la Cruz ◽  
E Santillana ◽  
A Mingo ◽  
G Fuenmayor ◽  
A Pantoja ◽  
...  
Keyword(s):  
Thin Layer ◽  
Fetal Lung ◽  
Chromatographic Determination ◽  
Solvent Mixture ◽  
Gastric Aspirate ◽  
One Dimensional ◽  
Acetic Acid Water ◽  
Chromatographic Resolution ◽  
Lung Maturity

Abstract This one-dimensional thin-layer chromatographic method is used for assay of phospholipids in the gastric aspirate of newborns. The solvent mixture (chloroform/hexane/methanol/glacial acetic acid/water, 12/7/4/3/0.3 by vol) completely resolves lecithin, sphingomyelin, phosphatidylinositol, phosphatidylserine, phosphatidylethanolamine, and phosphatidylglycerol. The method is simple, precise, inexpensive, and rapid (chromatographic development takes less than 25 min) and gives high chromatographic resolution. We used this method to determine the lecithin/sphingomyelin densitometric ratio (L/S ratio) and the phosphatidylglycerol percentage in 200 samples of gastric aspirate and found an L/S ratio of 2.5 to be a satisfactory cutoff value for distinguishing fetal lung maturity and immaturity. We confirmed that the presence of phosphatidylglycerol excluded the possibility of respiratory distress.

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