In the title mol-ecular salt, C6H11N3O2 (2+)·2C6H2N3O7 (-)·2H2O, the histidine mol-ecule exists as a histidinium dication, being protonated at the N atom of the imidazole ring. The charges are balanced by two picrate anions and the compound crystallizes as a dihydrate. In the crystal, the components are linked via N-H⋯O and O-H⋯O hydrogen bonds and weak C-H⋯O inter-actions, forming a three-dime...

A rapid colorimetric method, sensitive to 0-5 ,tg., is described for the determination of delta amino-laevulinic acid in urine. The method consists of a modification of the picrate method of Shuster in which interference by porphobilinogen is avoided by the use of an ion exchange resin. The method is found to give results which compare in accuracy with the longer standard method of Mauzerall an...

were taken to Makueni Hospital, treated and discharged. The family looked extremely poor and the only meal they had was boiled and raw cassava. In the second family, a child aged 5 died in Makueni District Hospital while continuing with management. Both families complained of headaches, abdominal pains and discomfort, vomiting, general body weakness and some fever. The Health Officer collected ...