John Irven

A comparative study of effects of nitrogen and argon on tyrosinase and malic dehydrogenase activities

Tyrosinase and malic dehydrogenase were treated with argon and nitrogen. Their activities were measured with time. The activities of tyrosinase and malic dehydrogenase when treated directly with argon, and when treated as a mixture of the enzymes and their substrates, were lower than with nitrogen treatments. The results suggest that argon reduces the activities of tyrosinase and malic dehydrogenase more than nitrogen. Tyrosinase activity with argon treatment was reduced by up to 14.2% more than nitrogen treatment when treated directly, and by up to 22.6% in the mixture of the enzyme and substrate. Malic dehydrogenase activity with argon treatment was reduced by up to 9.5% more than nitrogen treatment when treating the enzyme directly, and by up to 13.9% in the mixture of the enzyme and substrate.

Precursor chemistries for the electronics, opto-electronics and optical industries

Chemical gases and precursors have continued to be one of the main drivers enabling ongoing micro-miniaturisation in the electronics, electro-optics and optical industries. This paper will present a review of some of the background and ongoing challenges for gases and precursor chemistry as applied to solving real challenges of industrial importance, and as a backdrop to the contributed talks at this meeting on state of the art ongoing research.