Stability of tetracycline in water and liquid manure.

The objective of this study was to establish a suitable model for the prediction of the environmental stability of antibiotics in water and liquid manure. The model consists of incubation systems for solutions with installations for stirring ventilation. It was used to examine the stability of tetracycline in ventilated and unventilated Ringer's solution and liquid pig manure for a period of 8 days.

[Preliminary results of microbiologic studies of the processing of contaminated plastics (recycling)].

Spores of Bacillus subtilis were mixed with 200 g of polyethylene-granulate. The result was an initial concentration of about 10(5) colony-forming-units per g polyethylene. This mixture passed an injection-moulding machine.

The determination of diethylstilbestrol (DES) in the faeces and tissues of chickens treated with DES and in the faeces and tissue samples of calves, lambs and chickens collected from various areas of Turkey.

Diethylstilbestrol (DES) analyses were carried out on muscle, liver, kidney and faeces samples of 20 control and 20 experimental broilers to which 5 mg DES/day had been given orally for a period of 7 days. The treated samples were analysed using the Radioimmunoassay method. The removal time of DES from the tissues was determined.