Multidimensional Travelling Wave Solutions to Reaction-Diffusion Equations

The existence of nonplanar travelling wave solutions to a reaction-diffusionequation in an infinite channel is studied numerically. A boundary-valueproblem is derived via the introduction of a moving coordinatesystem. It is approximated on a finite domain through the introductionof artificial boundaries and the imposition of asymptotic boundaryconditions. Stability results for the waves are obtained byusing maximum principles.     

THE PEROXIDASE/OXIDASE ACTIVITY OF SOYBEAN LIPOXYGENASE - I. TRIPLET EXCITED CARBONYLS FROM THE REACTION WITH ISOBUTANAL AND THE EFFECT OF GLUTATHIONE

Soybean lipoxygenase shows a secondary peroxidase/oxidase activity: The aerobic reaction with isobutanal, enhanced by hydrogen peroxide as a cosubstrate, yields acetone, exhibits chemiluminescence and consumes oxygen (phi cl = 1.3 x 10(-9) photons/O2 molecule consumed). 9,10-Dibromoanthracene-2-sulfonate increases the photoemission (kET tau 0 = 2 x 10(4) M-1; phi cl = 0.9 x 10(-7) photons/O2), whereas it is diminished by sorbate, tryptophan, 2-methyl-1,4-naphthoquinone, glutathione, and superoxide dismutase. In the presence of hydrogen peroxide the lipoxygenase reaction with glutathione yields yet another excited state. From the well-known reactions promoted by horseradish-peroxidase, these features are concluded to indicate the novel activity of soybean lipoxygenase. With isobutanal as a substrate lipoxygenase acts as an oxidase and as a peroxidase. The mechanism suggested leads to photoemissive triplet excited acetone as expected from the cleavage of an intermediate dioxetane.     

ChemInform Abstract: Synthesis and Structure of a New Microporous Anionic Derivative of GeO2: (Ge18O38(OH4))8-((C2N2H10)2+)4×2 H2O.

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