In anoxic semi-closed systems, the survival time of the clam Macoma balthica was compared to clams which were incubated in the presence of several antibiotics (chloramphenicol, 5-oxytetracycline hydrochloride, penicillin, streptomycin, a mix of penicillin and streptomycin and a mix of chloramphenicol, polymyxin, neomycin and penicillin), sulphide and chloramphenicol at pH 6.8 and 8.2 and molybd...

Halitosis occurs in approximately 30% of the adult population and has a negative social and psychological impact on affected individuals. Mouthwashes may be used to prevent unpleasant odour, with long-duration of effect being a desirable attribute. The aim of this study was to assess the long-term efficacy of CB12 (a mixture of 0.3% zinc acetate and 0.025% chlorhexidine) for the treatment of in...

The manner of occurrence of sulphides (pyrite and pyrite melnikovite?) in a number of samples from the Philippine Sea is described and their genesis briefly discussed. Polished sections of consolidated material revealed both shards of volcanic glass and pyritized remains of microorganisms (Radiolaria?) in a pyrite matrix with a mosaic texture. The mosaic texture is thought to be due to early sy...

Introduction A number of works on cationic sensors have been reported in literatures [1] but less attention has been given towards the development of anionic sensors though there is a need for analysis of varieties of anions in different environmental, biomedical, industrial as well as chemical samples[2-3]. Anion sensors are simple, low cost, convenient, portable and provide quick response tow...

1. Cysteamine is oxidized to hypotaurine by an enzyme extracted from horse kidney, with sulphur or sulphide acting as a cofactor. It has been now found that, when the enzyme is omitted, sulphur and sulphide are able to catalyse the oxidation of cysteamine to cystamine by molecular oxygen. 2. Methylene blue may be used in catalytic amounts as a cofactor in the enzymic oxidation of cysteamine to ...

Octahedral core–shell AgBr emulsions sensitized by sulphur-plus-gold with gold added at 40uC either before or after sulphur sensitization were prepared and studied. The core emulsion was sensitized with a low level of dimethylamineborane (DMAB), and it enhanced the intrinsic sensitivity and long-wavelength sensitivity of the emulsion with an unsensitized shell. Oversensitization was observed fo...