xanthan gum is an extracellular polysaccharide produced by various xanthomonas species such as x. campestris . the objective of present study was to investigate the influence of different carbon and nitrogen sources on xanthan gum production by x. campestris . using an experimental response surface methodology (rsm) complemented with a central composite design (ccd), the impact of peptone, lact...

probiotics are defined as living microorganisms with beneficial effects on the host. probiotics, according to the least negative effect on the body, are considered as a good alternative to chemical drugs. lactobacillus acidophilus is used as a probiotic that is able to reduce cholesterol level in the blood. the effect of various concentrations of carbon, nitrogen and phosphorus for enhancing th...

metal matrix composites have been widely used in industries, especially aerospace industries, due to their excellent engineering properties. however, it is difficult to machine them because of the hardness and abrasive nature of reinforcement elements like silicon carbide particles (sicp).in the present study, an attempt has been made to investigate the influence of spindle speed (n), feed rate...

The exact maximum likelihood estimate (MLE) provides a test statistic for the unit root test that is more powerful (Fuller, 1996, p. 577) than the usual least squares approach. In this paper a new derivation is given for the asymptotic distribution of this test statistic that is simpler and more direct than the previous method. The response surface regression method is used to obtain a fast alg...

In this paper, effects of critical parameters, namely initial gap, squeezing speed and applied current were statistically investigated on the mechanical behaviour of MR fluid in squeeze mode. A set of 17 experiments was designed using Design Expert 7 software to gather data from response surface methodology (RSM). The responses in terms of compression modulus were then calculated. An MRF132-DG ...

Rationalizing Boundedly Rational Choice: Sequential Rationalizability and Rational Shortlist Methods A sequentially rationalizable choice function is a choice function which can be obtained by applying sequentially a fixed set of asymmetric binary relations (rationales). A Rational ShortlistMethod (RSM) is a choice function which is sequentially rationalizable by two rationales. These concepts ...

Low Entropy Masking Schemes (LEMS) have been proposed to offer a reasonable tradeoff between the good protection against side-channel attacks offered by masking countermeasures and the high overhead that results from their implementation. Besides the limited analysis done in the original proposals of LEMS, their specific leakage characteristics have not yet been analyzed. This work explores the...

For any Lie algebra of classical type or type G 2 we define a K-theoretic analog of Dunkl's elements, the so-called truncated Ruijsenaars-Schneider-Macdonald elements, RSM-elements for short, in the corresponding Yang-Baxter group, which form a commuting family of elements in the latter. For the root systems of type A we prove that the subalgebra of the bracket algebra generated by the RSM-elem...

Cordycepin (3’-deoxyadenosine) is one of the most versatile metabolites of Cordyceps militaris due to its broad spectrum of biological activity. In this study, response surface methodology (RSM) was applied to optimize the medium components for the cordycepin production by submerged liquid culture. The optimal parameters for cordycepin production within the experimental range of the variables r...