Analysis of Chromatic Dispersion Variation in Optical Fiber under Large Stretching

In the frame of a large-stroke optical fiber delay line implementation, using the ability of silica fibers to induce large and variable group delay when they are stretched, we intend to express theoretically the evolution of second-order chromatic dispersion versus fiber stretching. Both an experimental analysis and a numerical analysis are presented in this paper. The main result consists of the observation of a linear variation of the second-order chromatic dispersion versus a 0 to 32-cm group delay variation. The numerical simulation exhibits a discrepancy of 10% with respect to the experimental results.     

Colorimetric quantification of amino groups in linear and dendritic structures

BACKGROUND: The aim of the work reported was to develop a procedure using 96‐well microtiter plates for the easy determination of protonated groups of compounds including linear poly(amino acid)s and dendritic polymers divided into dendrigraft and dendrimeric structures. This study is a prerequisite step for the quantification of protonated groups in a macromolecule grafted onto a solid surface. RESULTS: The procedure was developed from the modified Bradford protein assay and incorporates several modifications that enable one to determine available amino groups (or even other cationic groups) present on the polyresidues backbone, all within five minutes. Based on the Atherton mathematical model, we evaluated the maximal number of Coomassie blue binding sites on linear, dendrigraft or even dendrimeric structures. CONCLUSION: The mean calculated percentage of occupied sites on a given macromolecule led us to demonstrate that one Coomassie blue molecule interacts with only one single protonated group. Consequently, the developed method using Coomassie blue binding can be used for the quantification of cationic groups in a macromolecule grafted onto a solid surface. Copyright © 2009 Society of Chemical Industry