Mixed Type of Malignant Mesothelioma in an Aged Male ICR Mouse     

Shirai M  Maejima T  Tanimoto T  Kumagai K  Makino T  Kai K  Teranishi M  Sanbuissho A 《Journal of toxicologic pathology》2011,24(3):169-172

Multiple whitish nodules in the thoracic cavity at the site of the thymus were observed in a 101-week-old male ICR mouse. In a histopathological examination, the neoplastic cells were predominantly fusiform in shape and proliferated in sarcomatoid growth patterns. Some neoplastic cells showed epithelial growth patterns, such as the ductal structures. Mitotic figures were frequently seen, and small necrotic foci and invasion to adjacent thoracic organs were noted. In Alcian blue staining, bluish materials were observed between fusiform-shaped cells and in some of the lumens of the ductal structures. In immunohistochemistry, both fusiform-shaped and ductal structure-forming cells were positive for vimentin and weakly positive to positive for cytokeratin. Based on the aforementioned findings, the thoracic nodules were diagnosed as a mixed type of malignant mesothelioma. This case was thought to be rare because of the very low occurrence of spontaneous mesothelioma in mice.  相似文献   

Effects of anion channel blockers on xylem nitrate transport in barley seedlings     

Tahei Kawachi  Chizuru Nishijo  Hiroyuki Fujikake  Salwa Abdel-Latif  Norikuni Ohtake  Kuni Sueyoshi 《Soil Science and Plant Nutrition》2013,59(2):271-277

Abstract

Taxonomic characteristics in accumulating Co and Ni was investigated with 60 plant species (37 genera, 27 families) grown on granite derived soils containing slightly low level of available Co. Considerable variations in Co and Ni content were observed among plant !species with small differences with regard to sampling sites. Exceptionally high Co content (25 ppm on D.W. basis) was found in the leaves of Clethra barbinervis. The value was about 48 times higher than the lowest Co content species. Reasonably high Co content was found with some species in genera: Hydrangea and Viburunum. Ni was highly accumulated in the leaves of Sasa borealis (16 ppm) and in fruits of Clethra barbinervis (65 ppm). [Other Nirich species were especially found in genera: Struthiopteris, Hydrangea, Stewartia, Clethra, and Symplocos. High positive correlation (P<0.01) was found between the concentration of Co and Ni in plant species.  相似文献   

A DGGE analysis shows that crop rotation systems influence the bacterial and fungal communities in soils     

Chika Suzuki  Norikuni Oka  Kazunari Nagaoka  Toshihiko Karasawa 《Soil Science and Plant Nutrition》2013,59(3):288-296

A better understanding of the relationships among different cropping systems, their effects on soil microbial ecology, and their effects on crop health and productivity is necessary for the development of more efficient, sustainable crop production systems. We used denaturing gradient gel electrophoresis (DGGE) to determine the impacts of crop rotations and crop types on bacterial and fungal communities in the soil. The communities of bacterial 16S rRNA genes and fungal 18S rRNA genes were analyzed in experimental field plots that were kept under 4 different crop rotation systems from 1999 to 2008 (continuous cabbage (Brassica oleracea var. capitata L.), cabbage–lettuce (Lactuca sativa L.) rotation, cabbage–radish (Raphanus sativus L. var. longipinnatus L.H. Bailey) rotation, and a 3-year crop rotation). A principal component analysis (PCA) and a canonical correspondence analysis (CCA) revealed that both the bacterial and fungal communities in bulk soils were influenced by the crop rotation systems. However, the primary factors influencing each community differed: bacterial communities were most affected by soil properties (especially carbon content), while fungal communities were influenced most strongly by rotation times. To elucidate factors that may cause differences in crop rhizosphere microbial communities, the microbial communities in the harvested cabbage rhizospheres were also analyzed. The results suggest that the fungal communities in bulk soil are related to the rhizosphere fungal communities. Our present study indicates that the microbial communities in bulk and rhizosphere soils could be managed by crop rotation systems.  相似文献   

Stochastic multiobjective optimization model for allocating irrigation water to paddy fields     

Qin Zhang  Shigeya Maeda  Toshihiko Kawachi 《Paddy and Water Environment》2007,5(2):93-99

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Application of shallow water equations to analyze runoff processes in hilly farmlands     

Kei Ishida  Macarius Yangyuoru  Koichi Unami  Toshihiko Kawachi 《Paddy and Water Environment》2011,9(4):393-401

Analysis of runoff processes in farmlands during storm events in particular is an important engineering topic. The shallow water equations describing the physical conservation laws are attractive tools for understanding motion of surface water. A numerical model is developed to reproduce surface water flows during storm events, using the finite element method and the finite volume method applied to the one-dimensional shallow water equations. The numerical model has the advantage of dealing with transcritical flows, wet, and dry processes, irregular channel bed slopes, and channel junctions involving multiply connected networks. Standard numerical tests demonstrated some of these features. Runoff processes from farmlands in a Japanese hilly area is analyzed with the numerical model coupled with another runoff model of black-box type. Parameters of the models are calibrated and validated using observed series of rainfall and runoff discharge data. Simulated results included submergence of hydraulic jumps and flood storage in farming plots, which are very informative in terms of assessing diverse functions of the farmlands.  相似文献   

Optimization model for cropping-plan placement in paddy fields considering agricultural profit and nitrogen load management in Japan     

Shunsuke Chono  Shigeya Maeda  Toshihiko Kawachi  Chie Imagawa  Natsuki Buma  Junichiro Takeuchi 《Paddy and Water Environment》2012,10(2):113-120

An optimization model for cropping-plan placement on field plots is presented for supporting decision-making on agricultural management by a farming organization. The mixed 0?C1 programming technique is employed to select the next planting crop at each field plot in a holistic manner. Reduction of total nitrogen discharged from field plots to the downstream end of the drainage canals is expressed as an objective function of the model to balance an achievement of economic goal and environmental conservation. Some Japanese governmental policies on regulating rice cropping areas and on promoting production of particular upland field crops can be formulated in the model. A computational example of cropping-plan placement on field plots managed under integrated policies is given by operating the optimization model with various weights associated with the objectives. The procured trade-off curve and corresponding patterns of cropping-plan could be useful in the decision-making by the farming organization.  相似文献   

Characterization and distribution of two subtypes of Verticillium longisporum isolated from cabbage fields in Japan     

Shinpei Banno  Kentaro Ikeda  Hidenari Saito  Hiroshi Sakai  Toshihiko Urushibara  Toshimasa Shiraishi  Makoto Fujimura 《Journal of General Plant Pathology》2015,81(2):118-126

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Estimation of potential area of preparatory irrigation for rainy season lowland rice and supplemental irrigation for dry season cropping using existing reservoirs constructed for aquaculture: a case study in semi-mountainous village,Lao PDR     

Anzai  Toshihiko  Ikeura  Hiroshi  Chomxaythong  Amphone  Keokhamphui  Khaykeo  Inkhamseng  Somphone 《Paddy and Water Environment》2019,17(4):633-650

Paddy and Water Environment - The rural area in Lao PDR has a low yield of rainy season lowland rice, and most rice fields are not utilized for crop cultivation during the dry season. Delay in...  相似文献   

Artificial insemination with canine semen stored at a low temperature     

Tsutsui T  Tezuka T  Mikasa Y  Sugisawa H  Kirihara N  Hori T  Kawakami E 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2003,65(3):307-312

Cooled canine semen solutions for storage were investigated with three stock solutions: egg yolk-citrate-glycine-glucose solution, egg yolk Tris-fructose citrate solution (EYT-FC), and egg yolk sodium citrate dihydrate solution (EYCD). For the control group, the second fraction of semen was examined. Nine male beagles and 37 female (47 experimental cases) beagles for artificial insemination (AI) were used. The qualities of semen stored at 4 degrees C deteriorated earlier in the control and EYCD groups. In the other two groups, sperm motility was 60% or higher after storage for 6 days and 20% or higher after storage for 12 days. On a comparison of these two groups, the sperm motility and viability were slightly higher in the EYT-FC group. A high conception rate was obtained by AI using semen stored at a low temperature for a maximum of two days in the control group and four days in the EYT-FC group.  相似文献   

Sperm granuloma and sperm agglutination in a dog with asthenozoospermia     

Kawakami E  Koga H  Hori T  Tsutsui T 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2003,65(3):409-412

A mongrel dog, aged 2 years, was found to have only a small number of sperm, immobilization of all sperm, and many sperm agglutinations in its ejaculates, and scrotal palpation revealed a small nodule in the left cauda epididymis. Addition of the dog's seminal plasma or serum to the semen of 2 normal dogs caused immobilization and agglutination of their sperm. Histological examination showed that the nodule was a sperm granuloma. Many lymphocytes were seen in the stroma around the sperm granuloma. Anti-sperm antibodies are presumed to be present in the semen and serum of the asthenozoospermic dog.  相似文献