scholarly journals Thin Layer Method Simulation of Near Source Ground Motions due to Discretized Dislocation in Layered Soils.

2000 ◽  
pp. 89-98
Author(s):  
Hirokazu TAKEMIYA ◽  
Kazuya GODA
Keyword(s):  
Thin Layer ◽  
Ground Motions ◽  
Layered Soils ◽  
Layer Method ◽  
Thin Layer Method

Chromatographic Detection of Flavor Additives in Vanilla Extract

1964 ◽  
Vol 47 (3) ◽  
pp. 551-555
Author(s):  
S Kahan ◽  
J Fitelson
Keyword(s):  
Thin Layer ◽  
Collaborative Study ◽  
The Other ◽  
Sensitive Test ◽  
Ethyl Vanillin ◽  
Modified Method ◽  
Layer Method ◽  
Layer Technique ◽  
Thin Layer Method ◽  
Chromatographic Detection

Abstract Two chromatographic methods, one a thin-layer technique and the other paper chromatography, were developed for five flavoring additives and submitted to collaborative study. The thinlayer method gave good results and proved to be a rapid and sensitive test. However, some of the features of the method required further study to improve the identification of the separated spots. A better test for coumarin and another solvent giving greater separation between the ethyl vanillin and veratraldehyde spots were developed. The modified method has been recommended for adoption as official, first action. Some analysts attained good results with the paper chromatographic test; others, even experienced analysts, got poor results. Some of the difficulty was traced to variations in composition of reagents, but the method needs further study to standardize conditions. This method was not recommended for adoption. The proposed chromatographic thin-layer method offers a rapid means of detecting ethyl vanillin, veratraldehyde (methyl vanillin), coumarin, piperonal (heliotropin), and vanitrope (propenyl guaethol).

scholarly journals The thin-layer method in a cross-anisotropic 3D space

2011 ◽  
Vol 89 (5) ◽  
pp. 537-560 ◽  
Author(s):  
João Manuel de Oliveira Barbosa ◽  
Eduardo Kausel
Keyword(s):  
Thin Layer ◽  
3D Space ◽  
Layer Method ◽  
Thin Layer Method

scholarly journals Die meting van die suurstofbindingseienskappe van hemosianien met die hulp van ’n dunlaag optiese sel

1992 ◽  
Vol 11 (2) ◽  
pp. 62-68 ◽  
Author(s):  
W. J. Van Aardt
Keyword(s):  
Thin Layer ◽  
Absorption Peak ◽  
Oxygen Binding ◽  
Initial Value ◽  
Marisa Cornuarietis ◽  
High Affinity ◽  
Layer Method ◽  
Thin Layer Method

The merits of the thin-layer method of Dolman and Gill to study the oxygen binding of haemocyanin were experimentally tested with haemocyanin obtained from arthropods and molluscs. The results show that, spectrophotometrically, oxyhaemocyanin from both arthropods and molluscs has a prominent absorption peak between 335 and 345 nm. Haemocyanin is more stable in the thin- layer preparation when compared with haemoglobin. At 35 °C a decrease in the initial absorbance value of less than 2% was found after three hours. For haemoglobin the initial value decreases nearly 10% during the same period. For a high-affinity haemocyanin such as Marisa cornuarietis (P⁵⁰ = 1,07 mmHg) the thin-layer method of Dolman and Gill (1978) shows better PO₂ resolution than other methods. The reason for this is that the dilution valve, which is absent in other thin-layer methods, intrinsically measures the resultant PO₂ values at very low tensions more accurately. In this study a step-by-step explanation of the technique is given. The calculations have been explained using real figures and examples. It is hoped that this detailed description will make this technique more readily available for use by respiratory physiologists.

scholarly journals MALDI Sample Preparation: the Ultra Thin Layer Method

10.3791/192 ◽  
2007 ◽  
Author(s):  
David Fenyo ◽  
Qingjun Wang ◽  
Jeffrey A. DeGrasse ◽  
Julio C. Padovan ◽  
Martine Cadene ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Thin Layer ◽  
Layer Method ◽  
Thin Layer Method ◽  
Maldi Sample
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