Toxascaris leonina was detected from 8 Japanese-breed domestic cats in Kanagawa Prefecture from October, 1983 to March, 1985. Feline infections had hardly been reported in Japan. Cat 1 had been kept indoor out of contact with imported or purebred cats. The ascarids of the cat seemed to be of the "dog strain", because of their high and low infectivity to dogs and cats, respectively. Cats 2-7 were kept together on the same farm and got in contact with imported cats. With ascarid eggs from one of those cats, dogs and cats were easily infected, so that the ascarids seemed to be of the "cat strain" which would have been introduced by imported cats and maintained on the farm. The history of Cat 8 was not determined, but its ascarids might be of the "cat strain" because of their high infectivity to both dogs and cats. Milbemycin D was administered orally to 3 and 2 naturally infected cats in doses of 0.05 and 0.1 mg/kg, respectively to deworm all the animals completely, except one administered with 0.05 mg/kg from which young adult worms were recovered at autopsy.
The mixtures of machined cast iron (FC300) chips and graphite (Gr.) powder with 3~10mass% Gr contents were mechanically alloyed (MA) up to 36ks. The obtained MA powder was mixed with polypropylene (PP) and paraffin wax (WAX) as the binder. Then it was stacked on a cast iron (FC300) plate as the substratum and hot-pressed at 893Kat various pressures to realize debinding and preforming. Subsequently, it was sintered at 973~1273K for 1.8ks, for the bonding of the MA alloy and FC300 plate. For the estimation of bonding characteristics, the structural change due to the sintering of the bonded MA alloy layer and the hardness distribution near the bonding interface were investigated. Rupture strength in a three-point-bending test was also investigated. The structure of the sintered MA alloy layer consists of a fine ferrite phase and graphite of nanometer-order size. The structure is the same as the MA powder. However, the hardness of the MA alloy layer decreases after sintering. The rupture strength of the cast-iron-bonded MA alloy is higher than that of cast iron without the MA alloy layer. Shot peening treatment was carried out on the surface of the MA alloy layer. The surface hardness of the MA alloy layer increases with the shot peening treatment.
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