Abstract

<i>S</i>-Collidine (2,4,6 trimethylpyridine) is used in some buffers for fixing the tissue for light and electron microscopy. Sometimes it is contaminated with mono and disubstituted products. It is therefore suggested to purify prior to use. The method for purification is difficult and it is not always necessary. This paper describes a simple method for assaying purity of <i>s</i>-collidine by reacting it with <i>p</i>-dimethylaminobenzoic acid (<i>p</i>-DMAB) in acidic alcoholic medium which gives a violet color immediately.

Determination of birefringence dispersion in nematic liquid crystals by using an S-transform

Serhat Özder, Emre Coskun, Oguz Köysal, and Özlem Kocahan
Opt. Lett. 32(14) 2001-2003 (2007)

Determination of the refractive index of a dielectric film continuously by the generalized S-transform

Emre Coşkun, Kıvanç Sel, and Serhat Özder
Opt. Lett. 35(6) 841-843 (2010)

Refractive-index-profile determinations by using Lloyd’s mirage

B. E. Allman, A. G. Klein, K. A. Nugent, and G. I. Opat
Appl. Opt. 33(10) 1806-1811 (1994)

Experimental Determination of the Short Wave Fundamental Color in Man’s Color Sense

Gustaf F. Göthlin
J. Opt. Soc. Am. 34(3) 147-158 (1944)

Improvement of the coherent model function for S-branch Raman linewidth determination in oxygen

Jonas I. Hölzer, Christian Meißner, and Thomas Seeger
Appl. Opt. 60(15) C76-C83 (2021)