Nonregular fractional factorial designs such as Plackett-Burman designs and other orthogonal arrays are widely used in various screening experiments for their run size economy and flexibility. The traditional analysis focuses on main effects only. Hamada and Wu (1992) went beyond the traditional approach and proposed an analysis strategy to demonstrate that some interactions could be entertaine...

Pwo Karen is an SVO type language which belongs to the Karenic branch of the Tibeto-Burman languages and is spoken in Burma and Thailand. It has more than sixty particles that are placed before or after verbs and they are called “verb particles” in this paper. Some of these verb particles have the function of changing the arguments of verbs. For example, one such verb pariticle, , which origina...

In Southeast Tibet, some Tibeto-Burman languages have apparent retroflex feature floating. Some initial research on this phenomenon shows that different sound categories, such as a post consonant r and vowels (or finals), are not totally independent. This is likely the result of evolution one category toward another, mechanism recombination between basic consonant. approach can be applied to st...

low grade grape juice concentrate was used as carbon source for xanthan production. significant factors affecting xanthan concentration, productivity and viscosity were investigated using plackett-burman design. based on the obtained results, carbon and nitrogen concentrations, inoculum size and agitation rate, were assumed as significant factors. broth culture viscosity and xanthan concentrati...

BACKGROUND Biodegradable polyesters are candidates for the development of environmental friendly plastics. Poly-β-hydroxybutyrate (PHB) is a type of polyester from the hydroxyalkanoates family, synthesized by bacteria as an intracellular material and accumulated as granules in the cytoplasm. OBJECTIVES The aim of this study was to isolate Poly β-hydroxybutyrate over producing bacteria and opt...