Man Injured by Black Bear in Togouchi EGUSA, Shinzi; KADOSAKI, Masaaki; KAWAHARA, Atsushi
JOURNAL OF THE JAPANESE WILDLIFE RESEARCH SOCIETY,
1991, Volume:
18
Journal Article
Open access
At about 10:30 a.m. on May 3, 1991 80 year old Mr.OOE was attacked by a sole black bear Ursus thibetanus in national forest in Togouchi, Hirosima, and injured on the left leg and right side of the ...head. The causes of bear attacks on humans are divided into three areas, i. e. to eat, to drive away and for sport or excitement. The motive for the attack in this incident seems either to drive the person away or to have sport with him. People entering bear habitat should carry a sound-making instrument, and a hatchet for self-protection.
Titanium is expected as a material of the hydroformed bellows. We investigated mechanical and gas desorption properties of titanium and conventional stainless steel bellows. The titanium bellows has ...much flexibility, that spring constant is 30 to 40% lower than that of the stainless steel one. The endurance test shows that the fatigue life of the titanium belows is roughly equal to that of the stainless steel one with the same displacement. The gas desorption rate of the titanium bellows is about 60% of the stainless steel one.
In the investigation of the cytotoxicity of dental restorative and luting materials in vitro, use of a dentin substitute which exhibits properties similar to those of dentin is essential. In the ...present experiment, the permeability of various potential dentin substitutes to eugenol from zinc oxide eugenol cement was determined using ultraviolet spectroscopy and compared with the permeability of dentin slices and powder. The mean amount of eugenol that permeated dentin slices was 20 μg/ml. However, this amount showed large variations, while variations in dentin powder, purified collagen and agar gel were smaller. Further studies on the properties of dentin and kinds of dental materials are needed for clarification of in vitro investigation of dentin permeability. We discuss the search for alternatives to the biological substance, which has many shortcomings associated with its use.
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