Two cases are described in which extensive use was made of the nitroblue tetrazolium (NBT) test. In the first case the advantages of using this technique to diagnose and control infection is shown; in the second the considerable advantage of the speed of the technique. In both of these cases the test made a material contribution to the management of the patient, and it is concluded that the tes...

! WALLNAUSSER~ has pointed out that TTC (2,3,5-triphenyl-2H-tetrazolium chloride) as well as other redox indicators such as z,6-dichlorophenol-indophenol can be, successfully employed either as visualizing sprays or as additions to the assay media. Although the use of tetrazolium salts in bioautography is not novel, our experience leads us to believe that their use as visualizing systems in bio...

The ability of Mycoplasma pneumoniae cells and membranes to affect tetrazolium reduction by hamster trachea organ cultures was evaluated. Uninfected trachea explants reduced 2,3,5-triphenyl tetrazolium chloride (TTC) and nitro-blue tetrazolium when incubated at 37 C in the absence of air. Reduced tetrazolium salts (formazans) were extractable with acetone or ethylene glycol and could be quantit...

A range of new biphenylazepinium salt organocatalysts effective for asymmetric epoxidation has been developed incorporating an additional substituted oxazolidine ring, and providing improved enantiocontrol in alkene epoxidation over the parent structure. Starting from enantiomerically pure aminoalcohols, tetracyclic iminium salts were obtained as single diastereoisomers through an atroposelecti...

In this tutorial we will tackle the problem of electronic correlations in quasi-one-dimensional organic superconductors. We will go through different pieces of experimental evidence showing the range of applicability of the Fermi and Luttinger liquid descriptions of the normal phase of the Bechgaard salts series and their sulfur analogs.

Indigo di- and monoimines can be protonated to form stable salts in which the central C=C bond has isomerized from a trans to cis configuration. Deprotonation of these salts regenerates the neutral trans species. The protonation chemistry of indigo is also explored.

The radical carbohydroxylation of styrenes with aryldiazonium salts has been achieved under mild thermal conditions. A broad range of aryldiazonium salts was tolerated, and the reaction principle based on a radical-polar crossover mechanism could be extended to carboetherification as well as to a two-step, metal-free variant of the Meerwein arylation leading to stilbenes.

Flavylium salts substituted at 4-position with hydroxyphenyl substituents were synthesized by acidic condensation according to a slightly modified procedure described by Robinson and Walker. Their thermodynamic properties and conformational analysis have been studied at DFT level.