Histopathological comparison of pulmonary artery lesions between raccoon dogs (Nyctereutes procyonoides) and domestic dogs experimentally infected with Dirofilaria immitis     

Kawabata A  Nakagaki K  Yoshida M  Shirota K 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2008,70(3):301-303

Five raccoon dogs (Nyctereutes procyonoides) and two domestic dogs (Canis familiaris) were subcutaneously infected with 100 infective larvae (L3) of Dirofilaria immitis. Two and five worms, respectively, were collected from two of three raccoon dogs. Villous endarteritis was found in the raccoon dog with five worms and two dogs at 116 days after infection. The number of recovered worms in the raccoon dogs was significantly smaller than that of the domestic dogs having 22 and 29 worms, while histopathological features and the severity of the lesions in the raccoon dogs were similar to those in the domestic dogs. The vascular lesions in two chronically-infected raccoon dogs turned into much severe at 565 and 590 days after inoculation.  相似文献   

Growth of juvenile chub mackerel Scomber japonicus in the western North Pacific Ocean: with application and validation of otolith daily increment formation     

Masanori Takahashi  Michio Yoneda  Hajime Kitano  Atsushi Kawabata  Mami Saito 《Fisheries Science》2014,80(2):293-300

The growth of juvenile chub mackerel Scomber japonicus collected in the western North Pacific Ocean in 2007 and 2009 was examined based on the evidence of otolith daily increment formation in captive specimens. There was a significant difference in the relationship between known age and number of increments in the frontal and sagittal planes. Repeated markings on the otolith using Alizarin complexone and the coefficient of variation in number of increments suggest that the increments in the frontal plane of the otolith are more suitable for age estimation than those in the long and short axes of the sagittal plane. The increments in the frontal plane formed daily, and the first ring was usually deposited 3 days after hatch. Age of wild juveniles ranged from 24 to 211 days after hatch based on the frontal plane method. The estimated hatching periods of specimens ranged from February to June, but the April-hatched specimens were collected throughout the sampling periods of 2007 and 2009. The Gompertz growth model showed a difference in growth pattern in specimens between 2007 and 2009. The juveniles in 2009 appeared to grow more quickly than those in 2007 until summer, but thereafter the 2009 specimens seemed to grow more slowly.  相似文献   

Alpha-glucosidase inhibitor from Chinese aloes     

Jong-Anurakkun N  Bhandari MR  Hong G  Kawabata J 《Fitoterapia》2008,79(6):456-457

Activity-guided fractionation of the methanol extract of Chinese aloes led to the isolation of aloeresin A, which demonstrated significant dose dependent alpha-glucosidase inhibitory activities, with IC(50) values of 11.94 and 2.16 mM, against rat intestinal sucrase and maltase, respectively.  相似文献   

Effect of low temperature rearing, using deep-sea water, on gonadal maturation of the short-spined sea urchin, Strongylocentrotus intermedius, in Rausu, Hokkaido     

Takaaki Kayaba  Kohji Tsuji  Hiroshi Hoshikawa  Yaoki Kikuchi  Kazuhiro Kawabata  Isao Otaki  Toru Watanabe 《Fisheries Science》2012,78(6):1263-1272

It has long been hoped that sea urchins could be served to visitors to seafood restaurants, hotels, and summer festivals in Rausu, located in the world natural heritage site ??Shiretoko,?? during the summer tourist season. However, to date this has not been feasible because of the sea urchin spawning season (July?CSeptember), during which the quality of the gonads, the edible part of the sea urchin, decreases due to maturation. In this study, we examined the possibility of suppressing gonadal maturation and maintaining high-quality sea urchin gonads by low-temperature rearing using deep-sea water. Unripe sea urchins captured before the spawning season were reared under two temperature conditions from June to September. In those groups reared at ambient temperatures (2.8?C19.6?°C), gametogenesis in both sexes progressed rapidly with increased temperature, and almost all sea urchins reached full maturity by late July. In contrast, in groups reared at low temperatures (2.1?C5.1?°C), gametogenesis progressed slowly and >60?% of the sea urchins did not reach maturity even by early September. The feeding experiment also revealed that feeding with live Saccharina diabolica could increase the gonadal volume efficiently under low-temperature rearing conditions. These results demonstrate that low-temperature rearing, supplemented with feeding, is effective in suppressing gametogenesis to allow for the harvesting of high-quality sea urchins during the summer tourist season.  相似文献   

Iron absorptive function of neonatal pig intestine     

K Furugouri  A Kawabata 《Journal of animal science》1979,49(3):715-723

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Heading behaviour in Japan of Turkish populations of cocksfoot,Dactylis glomerata L.     

Jiro Abe  S. Kawabata 《Euphytica》1979,28(3):643-649

Summary Ninety-nine populations of cocksfoot collected throughout Turkey were examined for heading behaviour at Sapporo, Japan. In some populations, all the plants produced heads in the year of sowing or in the aftermath of the next year. Much of the Turkish populations, even from the mountainous regions with severe winters, is also distinct in heading behaviour in autumn from the north European types, which fail to head in the year of sowing. This behaviour is related to winter temperatures of the place of origin, with the milder winter tending to result in a higher heading rate. Date of heading is also influenced by the climatic factors of the habitat, especially by the length of the growing period between winter and summer dormancies. Turkish populations provided useful material for the study of flowering habit.  相似文献   

Cloud images from the pioneer venus orbiter     

Travis LD  Coffeen DL  Del Genio AD  Hansen JE  Kawabata K  Lacis AA  Lane WA  Limaye SS  Rossow WB  Stone PH 《Science (New York, N.Y.)》1979,205(4401):74-76

Ultraviolet images of Venus over a 3-month period show marked evolution of the planetary scale features in the cloud patterns. The dark horizontal Y feature recurs quasi-periodically, at intervals of about 4 days, but it has also been absent for periods of several weeks. Bow-shaped features observed in Pioneer Venus images are farther upstream from the subsolar point than those in Mariner 10 images.  相似文献   

Seasonal changes in otolith and somatic growth in age-0 Pacific saury <Emphasis Type="Italic">Cololabis saira</Emphasis>     

Satoshi Suyama  Kazuhiro Oshima  Masayasu Nakagami  Atsushi Kawabata 《Fisheries Science》2011,77(2):223-233

We evaluated the seasonal changes in otolith and somatic growth of age-0 Pacific saury Cololabis saira in 223 fish collected between June and November 2002. We calculated the age in days of each individual by measuring otolith growth increments under a scanning electron microscope. The age was correlated with body length and otolith radius. We also observed seasonal changes in the rate of increase in body length and otolith radius and in the pattern of otolith growth. Until August, both body length and otolith radius increased with age. Thereafter, the otolith radius continued to increase, whereas the rate of somatic growth decreased. As a result, the ratio of otolith radius to body length increased. After August, the percentage of otoliths with unreadable increments on their edge increased due to the formation of hyaline zones. Otoliths grew both radially and in thickness until July, but gradually stopped growing in thickness after August. Beginning in October, more than 80% of otoliths only grew radially. After August, the otolith not only continued growing but the morphological growth pattern also changed.  相似文献   

Effect of shelter acclimation on the post-release survival of hatchery-reared black-spot tuskfish <Emphasis Type="Italic">Choerodon schoenleinii</Emphasis>: laboratory experiments using the reef-resident predator white-streaked grouper <Emphasis Type="Italic">Epinephelus ongus</Emphasis>     

Yuuki Kawabata  Kimio Asami  Masato Kobayashi  Taku Sato  Koichi Okuzawa  Hideaki Yamada  Kenzo Yoseda  Nobuaki Arai 《Fisheries Science》2011,77(1):79-85

A critical component of many releasing projects is the identification and subsequent implementation of optimal release strategies that can decrease post-release predation mortalities. We performed laboratory experiments to investigate whether acclimation to shelters affects the post-release survival of hatchery-reared black-spot tuskfish Choerodon schoenleinii in the presence of a reef-resident predator, the white-streaked grouper Epinephelus ongus. Tuskfish were exposed to groupers under three different experimental conditions/treatments: (1) acclimation of fish to shelters prior to their exposure to groupers; (2) no acclimation of fish to shelters, but with shelters available during their exposure to groupers; (3) fish not acclimated to shelters and no shelters available during their exposure to groupers. Tuskfish that were acclimated to shelters utilized shelters more frequently than did non-acclimated fish, and the survival rate of acclimated fish was higher than those of fish in the other treatments. These results suggest that pre-release acclimation to shelters improves the post-release survival of hatchery-reared black-spot tuskfish.  相似文献   

Occurrence and distribution during the post-settlement stage of two Choerodon species in shallow waters around Ishigaki Island, southern Japan     

Hideaki Yamada  Atsushi Nanami  Itaru Ohta  Kouki Fukuoka  Taku Sato  Masato Kobayashi  Narisato Hirai  Masayuki Chimura  Yuichi Akita  Yuuki Kawabata 《Fisheries Science》2012,78(4):809-818

The recruitment patterns of black-spot tuskfish Choerodon schoenleinii were compared with those of orange-dotted tuskfish (OT) C. ancholago. Individuals at the settlement and juvenile stages were collected using a push net in the intertidal zone and a seine net in seagrass beds. Relative values of standard length to total length (TL) for the two Choerodon species indicated an inflection point at approximately 10?C20?mm TL, suggesting that both species complete metamorphosis at a similar size. However, their temporal and spatial occurrence patterns were distinct. Newly settled individuals (postflexion stage) of black-spot tuskfish were collected mainly within foliage of Sargassum plants of the intertidal zone around March?CApril, while those of OT occurred in both the intertidal zone and seagrass beds mainly in May and June. In seagrass beds, the abundances of both species increased from May or June; however, the TL of black-spot tuskfish was bigger than that of OT. Therefore, black-spot tuskfish progressively migrate to seagrass beds after settling and completing metamorphosis in the intertidal zone, indicating that they utilize two different habitats as nursery grounds. Early spawning and migration from the intertidal zone by this species contributed to the occurrence of relatively large individuals in seagrass beds.  相似文献