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Articles by S. Morita
Total Records ( 3 ) for S. Morita
  A. Polthanee , T. Changdee , J. Abe and S. Morita
  A pot experiment was performed to examine the effects of flooding on growth, yield and aerenchyma development in adventitious roots of four kenaf (Hibiscus cannabinus L.) cultivars. Three flooding treatments consisting of early season flooding (30 days after planting), mid-season flooding (60 days after planting) and late season flooding (90 days after planting), as well as non-flooding control were used in the present study. The results show that soil flooding significantly increased plant height by 108 and 107% over control in early flooding and mid-flooding, respectively. Early flooding significant decreased the number of leaves and leaf area of whole plant and core dry weights by 15, 19 and 20% over non-flooding control, respectively. Soil flooding did not show any significant effect on plant height and number of leaf among cultivars, but did for leaf area, leaf dry weight and core dry weight. Early season and mid-season flooding significant decreased root dry weight in soil by 71 and 49% over non-flooded control, respectively. No adventitious roots developed in non-flooded control. Adventitious roots located in water above soil surface had dry weight of 18, 11 and 6 g plant-1 in early season, mid season and late season flooding, respectively. No significant difference in root dry weight located in soil and root dry weight located in water above soil surface were observed among cultivars. Aerenchyma formed in adventitious roots when the plant was subjected to flooding and was more developed in roots located in water above the soil surface as compared to roots located in soil. All the cultivars formed aerenchyma in their adventitious roots with variation among cultivars. Soil flooding significantly decreased fiber yield by 13% in non-flooded control in early season flooding treatments. However, mid-season and late season flooding did not show any significant difference on fiber yield in comparison with control. The cultivars was not significantly difference on fiber yield in the present experiment.
  T. Changdee , A. Polthanee , C. Akkasaeng and S. Morita
  The objective of this study was to investigate the effect of different waterlogging regimes on growth, yield and roots development in three fiber crops. Three fiber crops kenaf (Hibiscus cannabinus L.), roselle (Hibiscus sabdariffa L.) and jute (Corchorus olitorius L.) were subjected to waterlogging for 45, 60, 75, 90 and 105 days, as well as a well-drained subject (control). The waterlogging regimes had a significant effect on plant height, stem diameter, leaf area, biomass production, root growth and aerenchyma tissue formation. The crops subjected to waterlogging for longer periods were more affected in their growth characteristics: H. cannabinus had a higher plant height, stem diameter, leaf area, biomass production and root growth less than H. sabdariffa and C. olitorius. Aerenchyma tissue developed in adventitious roots of three fiber crops species. The fiber crops subjected to waterlogging regimes decreased fiber yield by 11.9-51.2% compared to the control. H. cannabinus produced the highest fiber yield after 45 days of waterlogging duration. This results is due to the higher growth and roots development of H. cannabinus than the other two fiber crops.
  S. Morita , Y. Shimajiri , S. Sakagashira , M. Furuta and T. Sanke
  Aim  The aim of the study was to determine whether fasting serum non-esterified fatty acid (NEFA) could be associated with long-term progressive deterioration of insulin secretion in patients with Type 2 diabetes.

Methods  Seventy-seven Japanese patients with Type 2 diabetes (mean BMI 23.3 kg/m2) were followed for 10 years. We measured fasting C-peptide level every 1-2 years. By using the slope of regression line between fasting C-peptide level and duration, we calculated its individual annual decline as an index of insulin secretion. During the follow-up periods of C-peptide, the patients were evaluated for fasting serum non-esterified fatty acid, LDL cholesterol, HDL cholesterol and HbA1c levels for the last 8 years. We excluded patients who had renal dysfunction or anti-insulin antibodies from among the insulin-treated patients. Association between the individual annual decline of fasting C-peptide level and related factors were evaluated.

Results  The mean individual annual decline of fasting serum C-peptide level was −0.013 ± 0.027 nmol/l/year. Fasting serum non-esterified fatty acid level had no significant difference between the first and the last 2 years of the 8-year observation period of non-esterified fatty acid. Using multiple regression analysis, mean fasting serum non-esterified fatty acid level was associated with the individual annual decline of fasting serum C-peptide level (standardized regression coefficient −0.358, P = 0.0056), although other related factors, including HbA1c level, were not associated.

Conclusions  Mean fasting serum non-esterified fatty acid level during an 8-year observation was independently associated with long-term progressive deterioration of insulin secretion in Japanese patients with Type 2 diabetes.

 
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