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Differences in body proportions between hatchery-reared- and wild Pacific herring, Clupea pallasii (Actinopterygii: Clupeiformes: Clupeidae)

100%

Nakaya M. , Fukunaga K. , Suzuki S.

2013

tom 43

nr 1

The body proportions of 0-group Pacific herring, Clupea pallasii, were compared between hatchery-reared- and wild fish and significant differences were observed. There were fewer vertebrae (Mean ± SD) in hatchery-reared- (52.5 ± 2.15) than in wild fish (53.7 ± 0.92). For both the hatchery-reared- and the wild individuals, the correlations between number of vertebrae and vertebral column length (VCL) per standard length (SL) were positive. Head length (HL) was approximated as SL minus VCL. Therefore, the proportion of HL in relation to SL became lower with the higher number of vertebrae. Their vertebral number may relate to the difference of body proportions between hatchery-reared- and wild fish.

Evaluation of bone stress distribution around thinly hydroxyapatite coated dental implant using finite element analysis

75%

Ozeki K. , Fukunaga K. , Yaguchi T. , Funakubo A. , Asaoka T. , Fukui Y. , Aoki H.

Biocybernetics and Biomedical Engineering

2007

tom Vol. 27, no. 1-2

89-94

Dental implants were coated with hydroxyapatite (HA) by the sputtering technique. The influences of the HA film thickness on the bone stress distribution was investigated using the three-dimensional finite element analysis. In this analysis, force of 100 N axial load was applied on the non-coated, thickly HA coated, and thinly HA coated titanium implants The maximum equivalent bone stresses were 21.5, 8.55 and 6.33 MPa for the non-coated, thickly HA coated, and thinly HA coated cylinder type implants, respectively. The bone stress of the screw type implants was 29.0, 9.20 and 9.03 MPa, respectively. The maximum bone stress of the thinly HA coated implant was lower than in the other implants. Eight types of the implant shape for the thinly HA coated implant were also designed, and the tiered neck type implant showed the lowest maximum bone stress in all the types.