CONTACT PHOTOALLERGY TO TRIBROMSALICYLANILIDE
SUMMARY. .
The disposition and metabolism of 3,4',5-tribromosalicylanilide and 4'5-dibromosalicylanilide in the rat.
1. The metabolism of two pesticides, 3,4',5-tribromosalicylanilide (TBS) and 4',5-dibromosalicylanilide (DBS) has been studied after oral administration to rats. 2. Approximately 65% of the dose of TBS is absorbed, and then excreted as glucuronide and sulphate conjugates of two hydroxylated metabolites. One of these has been identified as 4'-hydroxy-3,5-dibromosalicylanilide, while evidence suggests that the other metabolite is 5-hydroxy-3,4'-dibromosalicylanilide. 3. In contrast, only 11% of the dose of DBS is absorbed; it is then excreted mainly as glucuronide and sulphate conjugates of the parent molecule.
ROOM- AND HIGH-TEMPERATURE MAGNETIC PROPERTIES OF Sm(CobalFexCu0.088Zr0.025)7.5 (x=0.30) SINTERED MAGNETS
The effect of Fe content on room- and high-temperature magnetic properties of Sm(CobalFexCu0.088Zr0.025)7.5 (x=0-0.30) sintered magnets, prepared by the conventional powder metallurgy method, has been systematically studied. With increasing Fe content, the remanences BT and maximum energy products (BH)max at room temperature gradually increase and reach optimal values of 1.055 T with x=0.27 for BT, and 205 kJ/m3 with x=0.21 for (BH)max, respectively, and then drop sharply with further Fe increase. An excessive addition of Fe (x≥0.24) results in rapid deterioration of permanent magnetic properties due to the formation of a considerable amount of FeCo soft magnetic phase. It was found that the effect of Fe content on high temperature stability is huge. The lower the Fe content, the smaller the temperature coefficient of coercivity. When x=0.07, a temperature coefficient of coercivity of -0.14%/K (293-723 K) can be achieved, as compared with -0.23%/K for x=0.21. BT of 0.725 T, bHc of 517 kA/m, iHc of 764 kA/m, and (BH)max of 95 kJ/m3 at 723 K were obtained, and the B-H demagnetization curve remains a straight line.