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Articles by H. Ueno
Total Records ( 3 ) for H. Ueno
  Adel Ghoneim , H. Ueno , A. Ebid , N. Asagi and I. Abou El darag
  The fates of nitrogen-15 (15N)-labeled biogas slurry (BS) and chemical fertilizer (CF) applied to soil with low fertility cropped with rice were investigated. The 15N dilution method was used to estimate N uptake and recovery; potted soil was labeled with 1.0 atom % excess [15N] ammonium chloride ([15N]NH4Cl). Certain select soil characteristics were also measured in soil amended with the slurry to explain N losses. The values of the % N derived by fertilizer application to the plant exhibited significant differences among different plant parts. N uptake from the CF applied to rice grain, straw and the roots was significantly (p<0.05) higher than that from BS, but the highest proportion of N uptake by rice was from the soil. At harvest, an average of 6.2 and 13.2% of applied N remained in the soil treated with the CF and BS, respectively. Fertilizer use efficiency calculated by the 15N dilution method tended to be higher for CF than BS. A significant amount of N fertilizer (average: 30%) was apparently lost from the soil-plant system by ammonia (NH3) volatilization. Following BS application, the pH increased by 1 to 1.2 units in the top 5 cm of the soil, resulting in high NH3 volatilization in the first 2 days of the experiment. The NH3 volatilization accounted for the decrease in soil ammonium-N (NH4+-N) content.
  Y Seki , T Okusaka , M Ikeda , C Morizane and H. Ueno

Pancreatic acinar cell carcinoma (ACC) is a comparatively rare tumor and account for ~1% of all cases of pancreatic cancer. Clinical presentation is usually related to either local spread or metastasis. The clinical features, especially those related to the prognosis and treatment outcomes, have not yet been fully clarified. There are no established treatments for unresectable pancreatic ACC. We administered gemcitabine monotherapy to four patients with ACC; however, the results were not satisfactory. Disease control without obvious tumor shrinkage was observed in one patient. Another patient showed severe renal damage caused by gemcitabine. On the other hand, fluoropyrimidine-based chemotherapy may have some activity against this tumor, because one of the three patients who received S-1 as second-line chemotherapy showed a partial response. Prospective clinical trials are necessary to confirm the effectiveness of fluoropyrimidine for the treatment of pancreatic ACC.

  A. Ebid , H. Ueno , A. Ghoneim and N. Asagi
  The effect of a combination of inorganic fertilizer and organic inputs on nitrogen uptake and utilization efficiency was compared with that of only inorganic fertilizer. The treatments involved the addition of equivalent amounts of N (80 kg N ha-1) through inorganic fertilizer or three organic inputs (rice straw, rice root, or rice hull), in addition to a control treatment for rice (Oryza sativa L.) cultivars Koshihikari and Sakha 102. Rice straw was applied at two rates that corresponded to 5 and 10 Mg ha-1, the application rate of rice hull was 5 Mg ha-1 and rice root was 2.5 Mg ha-1. The rates of N utilization efficiency after 100th days after transplanting with 5 Mg ha-1 rice straw were relatively higher and ranged from 18.5 to 20.5%, while that with 10 Mg ha-1 ranged from 14.6 to 15.6%. The results show that a combination of inorganic fertilizers and rice straw enhanced N utilization efficiency. It is suggested that rice straw integrated with 40 kg N ha-1 of inorganic fertilizers and applied at a suitable time had a positive effect on N uptake derived from rice straw, whereas higher rates of rice straw application had an adverse affect on N uptake by the rice crop.
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