V.—αω-Diacetyl-αω-diethylpentane

Magnetic helicity fluxes in αΩ dynamos

In turbulent dynamos the production of large-scale magnetic fields is accompanied by a separation of magnetic helicity in scale. The largeand small-scale parts increase in magnitude. The small-scale part can eventually work against the dynamo and quench it, especially at high magnetic Reynolds numbers. A one-dimensional mean-field model of a dynamo is presented where diffusive magnetic helicity...

Diacetyl: occurrence, analysis, and toxicity.

Diacetyl possesses a butter-like flavor and has been widely used as a flavoring agent. It forms from sugars and lipids via various bacteria and heat treatment in various foods and beverages, such as milk. The toxicity of diacetyl, especially when inhaled, has recently attracted the attention not only of consumers but also of regulatory agencies. Even though accurate quantitative analysis of dia...

The fratricide of αΩ dynamos by their α2 siblings

Context. Helically forced magneto-hydrodynamic shearing-sheet turbulence can support different large-scale dynamo modes, although the αΩ mode is generally expected to dominate because it is the fastest growing one. In an αΩ dynamo, most of the field amplification is produced by the shear. As differential rotation is an ubiquitous source of shear in astrophysics, such dynamos are believed to be ...

A study of the reaction of urea with diacetyl monoxime and diacetyl.

Biosynthesis of diacetyl in bacteria and yeast.

Both diacetyl and acetoin were produced by cell-free extracts and cultures of Pseudomonas fluorescens, Aerobacter aerogenes, Lactobacillus brevis, and Saccharomyces cerevisiae 299, whereas only acetoin was produced by cell-free extracts and cultures of Streptococcus lactis, Serratia marcescens, Escherichia coli, and S. cerevisiae strains 513 and 522. Cell-free extracts that produced diacetyl di...