Plasmodium (Bennettinia) juxtanucleare infection in a captive white eared-pheasant (Crossoptilon crossoptilon) at a Japanese zoo     

Murata K  Nii R  Sasaki E  Ishikawa S  Sato Y  Sawabe K  Tsuda Y  Matsumoto R  Suda A  Ueda M 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2008,70(2):203-205

An adult male white eared-pheasant (Crossoptilon crossoptilon) at a Japanese zoo exhibited lethargy and emaciation. Microscopic examination of a blood smear revealed a haemosporidian parasitic infection. Based on the morphological characteristics and molecular analysis of the parasite, it was identified as Plasmodium (Bennettinia) juxtanucleare. This is the first report of P. juxtanucleare infection in bird species belonging to the genus Crossoptilon. Caution against avian malaria infection is required for the conservation of endangered bird species in zoos.  相似文献   

Spawning induction of blue mackerel <Emphasis Type="Italic">Scomber australasicus</Emphasis> and eastern little tuna <Emphasis Type="Italic">Euthynnus affinis</Emphasis> by oral administration of a crude gonadotropin-releasing hormone analogue     

Kotaro Amezawa  Ryosuke Yazawa  Yutaka Takeuchi  Goro Yoshizaki 《Fisheries Science》2018,84(3):495-504

Scombridae species, such as tunas and mackerels, often do not spawn in land-based fish tanks without hormone treatment. To induce spawning in various fishes, a gonadotropin-releasing hormone analogue (GnRHa) is often administered by pellet implantation. Noninvasive administration is desired to induce spawning in scombrids that are sensitive to handling stress. Spawning induction by oral administration has been reported in several fishes, yet this method has not been put into practice in the aquaculture industry since a considerable amount of GnRHa is needed. Utilization of peptide synthesizers is widespread, and antigen-grade GnRHa (AgGnRHa) produced by a custom-peptide supplier is approximately 100-fold cheaper than conventional reagent-grade GnRHa (RgGnRHa), although the purity of AgGnRHa is lower. Here, we confirmed that the spawning induction potency of AgGnRHa was similar to that of RgGnRHa by pellet implantation in blue mackerel Scomber australasicus. Oral administration of AgGnRHa [6.0 mg/kg body weight (BW) per day] showed an equivalent ability to induce spawning of the mackerel as pellet implantation (0.1 mg/kg BW). We could also induce spawning of eastern little tuna Euthynnus affinis by oral administration of the AgGnRHa. Further, the obtained eggs showed higher survival. Thus, the oral delivery of AgGnRHa could be a powerful tool to induce spawning in Scombridae.  相似文献   

Direct effects of linoleic and linolenic acids on bovine uterine function using in vivo and in vitro studies     

Ryosuke SAKUMOTO  Ken-Go HAYASHI  Kosuke IGA 《The Journal of reproduction and development》2022,68(1):62

The aim of the present study was to evaluate the effects of continuous administration of linoleic acid or linolenic acid into the intra-uterine horn, ipsilateral to the corpus luteum, on the duration of the estrous cycle and plasma progesterone (P4) concentration. The effects of linoleic and linolenic acids on bovine uterine and luteal functions were also studied using a tissue culture system. Intra-uterine administration of linoleic or linolenic acid (5 mg/10 ml of each per day) in cows, between days 12 and 21, resulted in a prolonged estrous cycle compared to the average duration of the last one to three estrous cycles before administration in each group (P < 0.05). Moreover, plasma P4 concentration in cows treated with linoleic or linolenic acid was high between days 19 and 21 (linoleic acid), or on day 20 (linolenic acid), compared to that of the control cows (saline administration; P < 0.05 or lower). Both linoleic (500 µg/ml) and linolenic (5 and 500 µg/ml) acids stimulated prostaglandin (PG) E2 but inhibited PGF2α production by cultured endometrial tissue (P < 0.01), while P4 production by cultured luteal tissue was not affected. These findings suggest that both linoleic and linolenic acids support luteal P4 production by regulating endometrial PG production and, subsequently, prolonging the duration of the estrous cycle in cows.  相似文献   

Expression of the Antimicrobial Peptide Piscidin 1 and Neuropeptides in Fish Gill and Skin: A Potential Participation in Neuro-Immune Interaction     

Giacomo Zaccone  Gioele Capillo  Jorge Manuel Oliveira Fernandes  Viswanath Kiron  Eugenia Rita Lauriano  Alessio Alesci  Patrizia Lo Cascio  Maria Cristina Guerrera  Michal Kuciel  Krystyna Zuwala  Jose Manuel Icardo  Atsushi Ishimatsu  Ryosuke Murata  Takafumi Amagai  Antonino German  Marialuisa Aragona 《Marine drugs》2022,20(2)

Antimicrobial peptides (AMPs) are found widespread in nature and possess antimicrobial and immunomodulatory activities. Due to their multifunctional properties, these peptides are a focus of growing body of interest and have been characterized in several fish species. Due to their similarities in amino-acid composition and amphipathic design, it has been suggested that neuropeptides may be directly involved in the innate immune response against pathogen intruders. In this review, we report the molecular characterization of the fish-specific AMP piscidin1, the production of an antibody raised against this peptide and the immunohistochemical identification of this peptide and enkephalins in the neuroepithelial cells (NECs) in the gill of several teleost fish species living in different habitats. In spite of the abundant literature on Piscidin1, the biological role of this peptide in fish visceral organs remains poorly explored, as well as the role of the neuropeptides in neuroimmune interaction in fish. The NECs, by their role as sensors of hypoxia changes in the external environments, in combination with their endocrine nature and secretion of immunomodulatory substances would influence various types of immune cells that contain piscidin, such as mast cells and eosinophils, both showing interaction with the nervous system. The discovery of piscidins in the gill and skin, their diversity and their role in the regulation of immune response will lead to better selection of these immunomodulatory molecules as drug targets to retain antimicrobial barrier function and for aquaculture therapy in the future.  相似文献   

Morphometric analysis of progressive changes in hereditary cerebellar cortical degenerative disease (abiotrophy) in rabbits caused by abnormal synaptogenesis     

Junko Sato  Naoaki Yamada  Ryosuke Kobayashi  Minoru Tsuchitani  Yoshiyasu Kobayashi 《Journal of toxicologic pathology》2015,28(2):73-78

We previously investigated rabbit hereditary cerebellar cortical degenerative disease, called cerebellar cortical abiotrophy in the veterinary field, and determined that the pathogenesis of this disease is the result of failed synaptogenesis between parallel fibers and Purkinje cells. In this study, longitudinal changes in the development and atrophy of the cerebellum of rabbits with hereditary abiotrophy after birth were morphometrically examined (postnatal day [PD] 15 and 42) using image analysis. Although development of the cerebellum in rabbits with abiotrophy was observed from PD 15 to PD 42, the growth rate of the cerebellum was less than that in normal rabbits. In rabbits with abiotrophy, the number of granular cells undergoing apoptosis was significantly higher at PD 15 and dramatically decreased at PD 42. The number of granular cells did not increase from PD 15 to 42. The synaptogenesis peak at PD 15 occurred when the largest number of apoptotic granular cells in rabbits with abiotrophy was observed. Although 26% to 36% of parallel fiber terminals formed synaptic junctions with Purkinje cell spines, the remainder did not at PD 15 and 42. The rate of failure of synaptogenesis in the present study might be specific to this case of abiotrophy. Morphometric analysis revealed detailed changes in development and atrophy in animals with postnatal cerebellar disease occurring soon after birth.  相似文献   

First report of anthracnose on tillandsia caused by Colletotrichum sp. in Japan     

Kumita  Kohei  Kitazawa  Yugo  Tokuda  Ryosuke  Miyazaki  Akio  Maejima  Kensaku  Namba  Shigetou  Yamaji  Yasuyuki 《Journal of General Plant Pathology》2021,87(4):254-258

Journal of General Plant Pathology - In July 2018, tillandsia (Tillandsia sp.) plants with brown to dark brown lesions on the leaves and pseudobulbs were found in Japan. Based on morphological and...  相似文献   

2005～2035年全球农作物播种面积变化情景模拟研究   总被引：3，自引：0，他引：3  

吴文斌  杨鹏  周清波  邹金秋  谈国新  柴崎亮介 《农业工程学报》2007,23(10):93-97

全球农作物播种面积变化对世界或区域的农业可持续发展、粮食安全与生态环境具有重要影响，研究分析全球作物播种面积动态变化具有重要意义。该研究借助离散选择理论，基于Logit模型建立了一个全球主要作物(水稻、玉米、小麦、大豆)播种面积变化模拟系统，对2005～2035年间全球4大作物播种面积的变化情景进行了模拟；从作物播种面积时序变化特征和空间变化特征方面对模拟结果进行了详细分析，并重点分析了亚洲区域不同作物播种面积的动态变化趋势。尽管模型还存在一些不确定性，但模拟结果在一定程度上仍然能为理解未来农业土地利用的复杂动态变化提供帮助，也可以为相关部门提供决策支持和信息服务。  相似文献   

Continuous plasma outflows from the edge of a solar active region as a possible source of solar wind     

Sakao T  Kano R  Narukage N  Kotoku J  Bando T  Deluca EE  Lundquist LL  Tsuneta S  Harra LK  Katsukawa Y  Kubo M  Hara H  Matsuzaki K  Shimojo M  Bookbinder JA  Golub L  Korreck KE  Su Y  Shibasaki K  Shimizu T  Nakatani I 《Science (New York, N.Y.)》2007,318(5856):1585-1588

The Sun continuously expels a huge amount of ionized material into interplanetary space as the solar wind. Despite its influence on the heliospheric environment, the origin of the solar wind has yet to be well identified. In this paper, we report Hinode X-ray Telescope observations of a solar active region. At the edge of the active region, located adjacent to a coronal hole, a pattern of continuous outflow of soft-x-ray-emitting plasmas was identified emanating along apparently open magnetic field lines and into the upper corona. Estimates of temperature and density for the outflowing plasmas suggest a mass loss rate that amounts to approximately 1/4 of the total mass loss rate of the solar wind. These outflows may be indicative of one of the solar wind sources at the Sun.  相似文献   

Viral-derived DNA invasion and individual variation in an Indonesian population of large flying fox Pteropus vampyrus     

Atsuo IIDA  Hitoshi TAKEMAE  Ronald TARIGAN  Ryosuke KOBAYASHI  Hirokazu KATO  Hiroshi SHIMODA  Tsutomu OMATSU  Supratikno  Chaerul BASRI  Ni Luh Putu Ika MAYASARI  Srihadi AGUNGPRIYONO  Ken MAEDA  Tetsuya MIZUTANI  Eiichi HONDO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(7):1068

Here, we performed next-generation sequencing (NGS) on six large flying foxes (Pteropus vampyrus) collected in Indonesia. Seventy-five virus species in the liver tissue of each specimen were listed. Viral homologous sequences in the bat genome were identified from the listed viruses. This finding provides collateral evidence of viral endogenization into the host genome. We found that two of the six specimens bore partial sequences that were homologous to the plant pathogens Geminiviridae and Luteoviridae. These sequences were absent in the P. vampyrus chromosomal sequences. Hence, plant viral homologous sequences were localized to the hepatocytes as extrachromosomal DNA fragments. Therefore, this suggests that the bat is a potential carrier or vector of plant viruses. The present investigation on wild animals offered novel perspectives on viral invasion, variation, and host interaction.  相似文献   

Effects of underdrainage in lowland poorly drained paddy field     

Ryosuke Tateoka 《Soil Science and Plant Nutrition》2013,59(1):80-84

The lowland poorly drained paddy field may be handicapped in general, to the better drained paddy field in soil productivity level for rice crops in Japan. This is principally responsible for the prevalence of reducing characteristics in soils because of the high waterlogging condition all the year round. Therefore, the effects of the soil drying treatment on lowland poorly drained paddy field by any drainage are highly significant for the satisfactory production of rice crops. Kobo0 has noted that, among the numerous soil properties changed after drainage of the lowland poorly drained paddy field, the decreases in soil nitrogen level which will be characterized by the stabilization of soil humus are associated most closely with the promotion of the soil productivity. The present study was set up to ascertain the effects of soil drying by underdrainage of the lowland poorly drained paddy field incomparison with the better drained paddy field under cultivation.  相似文献