Studies on Azine Compounds. III

Cv. the Azine and Azonium Compounds of the Proteolytic Enzymes

THE immense importance of the establishment of the chemical nature of the proteolytic enzymes has led to many endeavours to purify them. From the earliest attempts of Schwann [1836] to the present day all these have met with obvious failure. In 1905 it was observed by T. Brailsford Robertson [1907] that if one drop of saturated safranine (Griibler) is added to a solution of trypsin (Griibler) a...

The reaction of azine compounds with proteolytic enzymes.

Studies on uric acid and related compounds. III. Observations on the specificity of mammalian xanthine oxidases.

Xanthine oxidase (X0) has been thoroughly studied by many investigators and the range of possible substrates of this enzyme is well known (1, 2). In the early experiments, enzymatic activity was measured by decolorization of a suitable dyestuff such as methylene blue or by oxygen consumption. Therefore, the exact pathway of oxidation remained unknown for many substrates. The spectrophotometric ...

The chemistry of superheavy elements . III . Theoretical studies on element 113 compounds

The chemistry of element 113 is investigated by theoretical methods. The results of fully relativistic calculations for ~113!H and ~113!F are compared with those derived by other techniques to obtain an indication of the accuracy of the more approximate models as well as the importance of including scalar and/or spin–orbit relativistic effects. Both of these effects are found to be important. T...

4-(Diethyl­amino)­salicyl­aldehyde azine

The title compound, C(22)H(30)N(4)O(2), has a crystallographic inversion center located at the mid-point of the N-N single bond. Apart from the four ethyl C atoms, the non-H atoms are nearly coplanar with a mean deviation of 0.0596 (2) Å. An intra-molecular O-H⋯N hydrogen bond occurs. In the crystal, weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into layers parallel to (100).