the present study was undertaken to investigate and optimize the possibility of xanthan gum production by xanthomonas campestris ptcc1473 in 500ml shake flasks on the second grade date palm. using an experimental response surface methodology (rsm) coupled with a central composite design (ccd), three major independent variables (nitrogen source, phosphor source and agitation rate) were evaluated...

exact solution for steady two-dimensional flow of an incompressible magma is obtained. themagmatic flow is studied by considering the magma as a second grade fluid. the governing partialdifferential equations are transformed to ordinary differential equations by symmetry transformations. resultsare discussed through graphs to understand the rheology of the flowing magma

objective: the purpose of this study is to examine the factor structure, internal consistency, and construct validity of preschool, first and second grade versions of berkeley parenting self-efficacy scale. method: the subjects were 317 mothers: (102 mothers of preschool children, 111 mothers of first grade children and 104 mothers of second grade children) who were randomly selected from schoo...

This study is part of a broader on algebraic reasoning in elementary education. The research objective the present survey, namely to describe generalization among second grade (7- 8-year-old) students, was pursued through semi-structured interviews with six children connection contextualized task involving function y = x + 3. Particular attention paid structures recognized and type expressed by...