The pyruvate-aspartic semialdehyde condensing enzyme, which occurs at the branch point in the aspartic acid family of amino acids leading to diaminopimelic acid and lysine biosynthesis, has been purified 5000-fold from crude extracts of Escherichia coli W. The protein has been shown to be homogeneous by polyacrylamide gel electrophoresis and bears a net negative charge in the pH range 6.0 to 9....

A novel metal borohydride ammonia-borane complex Ca(BH4)2·NH3BH3 is characterized as the decomposition product of the recently reported perovskite-type metal borohydride NH4Ca(BH4)3, suggesting that ammonium-based metal borohydrides release hydrogen gas via ammonia-borane-complexes. For the first time the concept of proton-hydride interactions to promote hydrogen release is applied to a cation-...

Application of SiO2@FeSO4 nanocomposite as a new nanocatalyst in reduction area was investigated. Carboxylic acid simple and convenient reduction to alcohol by 0.75 mol of the nanocomposite, 3 mol sodium borohydride (NaBH4) as reduction reagent under a solvent-free condition at 30-65 min. The reaction happens in two stages - first to form an aldehyde and the...