Genetic variation in the mitochondrial and nuclear DNA of the Japanese conger Conger myriaster   总被引：1，自引：0，他引：1  

Satoshi Ishikawa  Yobuo Kimura  Tadashi Tokai  Katsumi Tsukamoto  Mutsumi Nishida 《Fisheries Science》2001,67(6):1081-1087

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Modelling the contact probability and size-selectivity of toothed dredges     

Takahisa?Mituhasi  Toshihide?Kitakado  Fuxiang?Hu  Tadashi?TokaiEmail author 《Fisheries Science》2005,71(4):703-712

ABSTRACT:   To estimate fishing gear selectivity of clam dredges from data of paired-gear tests in the SELECT analysis process, this paper presents a statistical model of the probability of a clam coming into contact with the dredge teeth and size-selectivity of the control gear. The net-mouth available selectivity is defined as the product of the probability of a clam contacting the dredge teeth and size-selectivity induced by tooth spacing. The model based on the SELECT analysis was tested by using data generated by virtual paired-gear test in which the control dredge of the smallest tooth spacing is assumed to be size-selective. No clear difference in shell length distribution between dredges of different tooth spacings was found in the simulation when the contact probability was small. The plots of proportion of clams caught in the test dredge to the total catch number of clams were U-shaped, and the model fitted the data well. For each simulation consisting of 500 replications, the sample mean and mean square error of each parameter were obtained to evaluate the performance of estimation by comparing with the true value. Parameters were properly estimated with the model.  相似文献   

Myofibrillar proteolysis by myofibril-bound serine protease from white croaker <Emphasis Type="Italic">Argyrosomus argentatus</Emphasis>     

Makoto?OhkuboEmail author  Kiyoshi?Osatomi  Kenji?Hara  Tadashi?Ishihara  Futoshi?Aranishi 《Fisheries Science》2005,71(5):1143-1148

ABSTRACT:   The modori phenomenon is defined as heat-induced myofibrillar degradation caused by endogenous serine protease(s) of fish muscle during Kamaboko fish meat gel production. This study was undertaken to analyze myofibrillar proteolysis of white croaker Argyrosomus argentatus muscle, which is an ingredient of high quality Kamaboko, by myofibril-bound serine protease (MBSP) under conditions corresponding to the modori phenomenon. White croaker MBSP was stable between pH 2–11 and below 65°C, and about 60% of its initial activity remained after incubation for 2 h under the conditions at 65°C and pH 7.5. About 60% of the enzyme activity was suppressed by 0.5 M NaCl. White croaker MBSP degraded various myofibrillar proteins between 40 and 70°C and pH 6.0–9.0, and preferentially degraded myosin heavy chain rather than other myofibrillar proteins. The enzyme degraded the myosin heavy chain most strongly at 55°C and pH 7.0, and a major part of the bands of myosin heavy chain and its degradation products disappeared for a period of 2 h. These degradation characteristics are very similar to those observed during the modori phenomenon, indicating that MBSP could be a modori-inducing protease involved in the modori phenomenon of white croaker Kamaboko production.  相似文献   

Effect of enzymatic fish-scrap protein hydrolysate on gel-forming ability and denaturation of lizard fish Saurida wanieso surimi during frozen storage   总被引：3，自引：0，他引：3  

Mohammed Abu  Ali KHAN  Mohammed Anwar  HOSSAIN  Kenji  HARA  Kiyoshi  OSATOMI  Tadashi  ISHIHARA  Yukinori  NOZAKI 《Fisheries Science》2003,69(6):1271-1280

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Verrucarin A Inhibition of MAP Kinase Activation in a PMA-stimulated Promyelocytic Leukemia Cell Line     

Taiko Oda  Michio Namikoshi  Kyoko Akano  Hisayoshi Kobayashi  Yoshio Honma  Tadashi Kasahara 《Marine drugs》2005,3(2):64-73

Verrucarin A is an inhibitor of protein synthesis. In this study, we examined the inhibitory action of verrucarin A on signal molecules. Verrucarin A partially inhibited the IL-8 production of a PMA-stimulated promyelocytic leukemia cell line (HL-60 cells), and the effect was related to the inhibition of NF-κB activation at non-cytotoxic concentrations. Moreover, the inhibition of mitogen activated protein (MAP) kinase by verrucarin A was especially strong with p38- and JNK-phosphorylation. The findings show a new action of verrucarin A, and it is expected that this action relaxes the signal activation in response to stress.  相似文献   

Downregulation of Histone Methyltransferase Genes SUV39H1 and SUV39H2 Increases Telomere Length in Embryonic Stem-like Cells and Embryonic Fibroblasts in Pigs     

Thanh Quang DANG-NGUYEN  Seiki HARAGUCHI  Tadashi FURUSAWA  Tamas SOMFAI  Masahiro KANEDA  Shinya WATANABE  Satoshi AKAGI  Kazuhiro KIKUCHI  Atsushi TAJIMA  Takashi NAGAI 《The Journal of reproduction and development》2013,59(1):27-32

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Effects of habitat type, vegetation structure, and proximity to forests on bird species richness in a forest–agricultural landscape of West Java, Indonesia     

Dendi Muhamad  Satoru Okubo  Tadashi Miyashita  Parikesit  Kazuhiko Takeuchi 《Agroforestry Systems》2013,87(6):1247-1260

To halt biodiversity loss in the humid tropics of developing countries, it is crucial to understand the roles and effects of human-modified landscapes with fragmented forest remnants in maintaining biodiversity while fulfilling the demands of local communities and reducing poverty. To implement appropriate landscape planning for conserving biodiversity and ecosystem functioning, appropriate information is required about parameters of habitat suitability among various anthropogenic habitats with a range of distances to forests and vegetation characteristics, but such information is limited. We examined differences in avian communities between a remnant forest and four types of man-made forest (two mature plantations and two agroforests) in a forest–agricultural landscape of West Java, and we analyzed the effects of both local and landscape factors on various types of species richness in this landscape. The results from non-metric multidimensional scaling revealed avifauna in the two types of agroforest was clustered separately from that in the remnant forest, mainly because drastic declines in the abundance of forest specialists (including IUCN red-listed species) and their replacement with open-habitat generalists. The mixed-tree agroforests were colonized by 30 % of forest specialists and forest-edge species found in the remnant forest, and maintained the highest richness of species endemic to Indonesia among man-made forests, implying that some forest specialists and endemics might have adapted to ancient landscape heterogeneity. High proportion of insectivorous birds was found in the remnant forest (more than 50 %) and drastically decline in man-made forests, although the species richness of insectivores did not decline significantly in broad-leaved plantations. We concluded that protection of remnant forests should be prioritized to conserve forest bird diversity. However, as different environmental factors affected the richness values of different ecological groups, appropriate landscape design and habitat management could improve functional diversity in forest–agricultural landscapes in the tropics.  相似文献   

Radial variation of wood cell features under different stocking densities management of two new clones of rubberwood (Hevea brasiliensis)     

Hamid Reza Naji  Mohd. Hamami Sahri  Tadashi Nobuchi  Edi Suhaimi Bakar 《Journal of Wood Science》2013,59(6):460-468

Wood characteristics vary from pith to bark and this can influence the final use. These variations can be related to the effects of plantation management. The radial variation in fiber cells, vessel elements, and ray cells was investigated for a commercial and fast-grown species, the rubberwood (Hevea brasiliensis), at varying stocking densities. Nine-year-old trees of two new clones (RRIM 2020 and RRIM 2025) were categorized into four stocking densities of 500, 1000, 1500, and 2000 trees ha^?1. The sample blocks were anatomically analyzed to determine the changes in wood cells from pith to bark. The results generally showed a centrifugal increase in fiber features, vessel diameter, ray height, and ray area. Vessel density and ray density showed a decreasing trend. Vessel areas revealed a radial irregular variation. The ray area showed a striking relationship with ray density and ray height. Ray cell pattern indicated enough variation for visual approval to ensure within and between stocking density changes. Most radial variation was explained by the effect of cambial age. Owing to different stem width and growth rates, the mean cell features were not at the same radial distances from the pith.  相似文献   

The First Case of Feline Infectious Peritonitis-like Pyogranuloma in a Ferret Infected by Coronavirus in Japan     

Michimae Y  Mikami S  Okimoto K  Toyosawa K  Matsumoto I  Kouchi M  Koujitani T  Inoue T  Seki T 《Journal of toxicologic pathology》2010,23(2):99-101

A male ferret, which was purchased from abroad at 9 months of age, had shown significant weight loss starting at 13 months of age. The ferret subsequently showed decreasing motor activity and recumbency and was euthanized at 14 months of age. At necropsy, a white, quail egg-sized mass was found in the mesentery. Histopathologically, multifocal granulomas consisting of necrotic foci, macrophages, fibroblasts and plentiful fibrous connective tissues were observed in the mesenteric mass. Surrounding the granulomas, inflammatory cell infiltration consisting of neutrophils, lymphocytes and plasmacytes was observed diffusely and significantly. Immunohistochemistry revealed small numbers of macrophages around necrotic foci that were positively stained for anti-mouse feline coronavirus. Electron microscopically, the cytoplasm of the macrophages contained viral particles, which were identified as coronavirus. The histopathological features in this ferret were similar to those in cats with feline infectious peritonitis (FIP). This was the first case in ferrets in Japan.  相似文献   

Distribution of small plastic fragments floating in the western Pacific Ocean from 2000 to 2001     

Keiichi Uchida  Ryuichi Hagita  Toshifumi Hayashi  Tadashi Tokai 《Fisheries Science》2016,82(6):969-974

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