Bacteria Classification By Gram Staining Author: Karim A. Zaklama 92-1509 Sci. 453-01 THE AMERICAN UNIVERSITY IN CAIRO SCIENCE 453 : BIOLOGY FOR ENGINEERS REPORT No.1 Objective: To test a sample of laboratory prepared bacteria and categorise it according to Christian’s gram positive and gram negative classes and also by viewing it under a high powered microscope and oil immersions; classify its shape and note any special characteristics. Introduction: Bacteria was categorised into two groups in 1884 by the Danish Bacteriologist Christian, gram positive and gram negative by a staining technique where the ability to avoid de-coloration of Crystal Violet solution