Rachael Sharman

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Outside of the laboratory, bacterial cells are constantly exposed to stressful conditions, and an ability to resist those stresses is essential to their survival. However, the degree of stress required to bring about cell death varies with growth phase, amongst other parameters. Exponential phase cells are significantly more sensitive to stress than(More)
Debate continues as to why executive function (EF) continues to show impairments in children with early and continuously treated phenylketonuria (ECT-PKU). Using a mixed model, we measured EF in 10 adolescent children with ECT-PKU and 6 sibling controls, and examined associations between EF and (1) phenylalanine (phe) and (2) the phenylalanine : tyrosine(More)
Children with early and continuously treated phenylketonuria (ECT-PKU) remain at risk of developing executive function (EF) deficits. There is some evidence that a high phenylalanine to tyrosine ratio (phe:tyr) is more strongly associated with impaired EF development than high phenylalanine alone. This study examined EF in a sample of 11 adolescents against(More)
Previous research shows consistent and marked executive function impairment in children with early and continuously treated phenylketonuria. This between groups analysis (phenylketonuria group vs sibling controls) found no significant differences in executive function (although adolescents with phenylketonuria performed slightly worse than their siblings).(More)
The presence of a viable competitive microflora at cell densities of 10(8) CFU ml-1 protects an underlying population of 10(5) CFU of Salmonella typhimurium ml-1 against freeze injury. The mechanism of enhanced resistance was initially postulated to be via an RpoS-mediated adaptive response. By using an spvRA:: luxCDABE reporter we have shown that although(More)
Investigations into the biochemical markers associated with executive function (EF) impairment in children with early and continuously treated phenylketonuria (ECT-PKU) remain largely phenylalanine-only focused, despite experimental data showing that a high phenylalanine:tyrosine (phe:tyr) ratio is more strongly associated with EF deficit than phe alone. A(More)
PURPOSE/OBJECTIVE Phenylketonuria (PKU) is an inborn error of metabolism that is primarily treated with a severely restricted, low-protein diet to prevent permanent neurological damage. Despite the recognition of the importance of strict dietary adherence in the prevention of intellectual impairment in individuals with PKU, apathy and attrition from diet,(More)
Hyperphenylalaninemia is a variant of phenylketonuria, and debate remains as to what, if any, active management of this condition is required to preserve cognitive function and psychological well-being. This study is the first to examine longitudinally the executive function (EF) in adolescents with hyperphenylalaninemia. Two sibling pairs with mild(More)
BACKGROUND Previous research has suggested an increased risk for individuals with phenylketonuria (PKU) of developing depression and other mood disorders. As PKU can disrupt neurotransmitter synthesis via biochemical mechanisms, depressive symptoms are hypothesised to result from neurotransmitter dysregulation. Whilst adherence (or return) to the(More)
OBJECTIVE Increasing concurrent phenylalanine to "off-diet" levels in adults with phenylketonuria (PKU) has been shown to lead to mood disturbances. However, the impact of controlled phenylalanine exposure across the developmental life span and mood stability remains questionable. The aim of this study was to investigate correlations between lifetime and(More)