EFFECT OF NUTRITIONAL FACTORS ON CELL GROWTH AND SHIKONIN DERIVATIVE FORMATION IN SUSPENSION CULTURES OF ARNEBIA EUCHROMA CELLS EFFECTS OF PH VALUE AND HORMONES ON CELL GROWTH AND SHIKONIN DERIVATIVE FORMATION IN SUSPENSION CULTURES OF ARNEBIA EUCHROMA CELLS Effects of Physical and Chemical Factors on Callus Growth and Shikonin Derivative Formation in the Callus Cultures of Arnebia euchroma Studies on Cell Suspension Culture and Fermentation Culture in Arnebia euchroma