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Volume 31 (2000 - 200･･･
- Issue 4 Pages 197-
- Issue 3 Pages 145-
- Issue 2 Pages 79-
- Issue 1 Pages 1-
Volume 31, Issue 3
Displaying 1-6 of 6 articles from this issue
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Kenji KOBASHI, Hiroshi GEMMA, Shuichi IWAHORI, Yoshiaki UMEMIYA2000 Volume 31 Issue 3 Pages 145-152
Published: December 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIn order to understand a mechanism regulating sugar accumulation in peach fruit under water stress condition, 13C-photoassimilates partitioning to fruit and the other organs in container-grown peach trees were examined under water stress condition during fruit maturation stage.
Under moderate water stress condition [φmax (predawn leaf water potential): -0.85MPa], 13C content per unit dry matter, corresponding to sink activity for photoassimilates, increased in fruit, although photosynthetic rate decreased to 83%. On the other hand, under severer water stress condition (φmax: -1.65MPa), both the photosynthetic rate and the photoassimilates partitioning to fruit were decreased. These results suggest that photoassimilate partitioning to fruit are accelerated under moderate water stress condition, although the severe water stress exerts an opposite effect.View full abstractDownload PDF (968K) -
Shuyun ZHAO, Zhenya ZHANG, Takaaki MAEKAWA2000 Volume 31 Issue 3 Pages 153-162
Published: December 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSTwo sets of comparative experiments between the suspended cell system and the immobilized system were carried out to test their tolerance to acidic environment, the resistance to the inhibition of a higher level of ammonia as well as the consumption of glucose substrate, respectively. The immobilized system in hydrogen production through hydrogen-producing microbe, showed a superior advantage over the suspended cell system as shown as follows:
(1) There is an obvious increase of the tolerance to the acidity and hydrogen production rate in the cultural medium.
(2) Consumption rate of glucose in immobilized culture was much lower than that of the suspended culture.
In addition, the cell yield and kinetic constant for Enterobacter aerogenes under the utilization of ammonium nitrogen, were obtained in the suspend system using substrate-inhibited Monod model.View full abstractDownload PDF (1040K) -
Prediction and automatic watering system for soil moisture using multiple regression analysisKazuhiro NAKANO, Takuo KAWAKAMI, Yasuo OHTSUKA, Shinobu MIZUNO2000 Volume 31 Issue 3 Pages 163-170
Published: December 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe objective of this study is to develop the automatic watering system which can predict the changes of soil moisture; pF value, in a greenhouse and control pF value appropriately. The soil moisture control system and the environmental supervisory system were constructed in this study. Changes of pF values were determined as the dependent variable in the multiple regression, and temperature, humidity and solar radiation were used for the independent variables. The cultivated results using the above multiple regression method were compared with farmer's manual watering.
For the cucumber cultivation, the amount of watering, the yield, the quality of vegetables and the income were measured. Differences in the results between the multiple regression method and the farmer's manual watering were almost the same in the above factors. For the tomato cultivation, the total yield of vegetables in the multiple regression method was 10% fewer than that by the farmer's manual watering. But the sugar content, the quality of the vegetables and the total income in the multiple regression method were almost the same result in the farmer's manual watering.
The automatic watering system using multiple regression method developed in this study is useful for the prediction of soil moisture and appropriate control of pF value in the greenhouse.View full abstractDownload PDF (4400K) -
3D size changesRichard L. Urasa, Shun-ichiro TANAKA, Fumihiko TANAKA, Kazuo MORITA2000 Volume 31 Issue 3 Pages 171-178
Published: December 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe study was conducted by using 2D image processing technique, actual measurements of three dimensions ‘a’, ‘b’ and ‘c’ mutually perpendicular axes by vernier caliper and actual volume of grain by picnometer during soaking, with an objective of estimation of volume. The study revealed that; (1) the ratio of instantaneous size to initial size a/a0, b/b0 and c/c0 change with moisture content have a significant disproportion as moisture content increases. (2) The ratio ‘b/a’ and ‘c/a’ changes with moisture content have 3 periods: constant, falling, and equilibrium. (3) Shape factor has linear relationship with moisture content, and temperature is insignificant. (4) The product of the sizes ‘a’, ‘b’ and ‘c’, that is volume of the circumscribing rectangular box, closely estimates measured volume of grain based on circumscribed theoretical volume within r2=0.90. (5) Specific volume (abc) and actual specific volume have linear relationship with moisture content, and temperature is insignificant. (6) Actual dry solid density of soybean can be extrapolated from specific volume-moisture content relation, and evaluated as 1.36 (g/cm3). Difference in initial moisture content is insignificant. (7) Image pixels raised to the power of 1.5 modified by shape factor can estimate measured volume within r2=0.90.View full abstractDownload PDF (912K) -
Kazutaka UMETSU, Hidehiko TAKAHATA, Yoshiteru TAKEUCHI2000 Volume 31 Issue 3 Pages 179-184
Published: December 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA 60m3 baffled anaerobic digester was installed in the ground and was operated with separated dairy manure slurry at a digester temperature of approximately 35°C. In the high loading operational mode, the maximum biogas production was 118.7m3/day, consisting of 56.5% methane gas with an average loading rate of 8.1kgVS/m3/day at an average ambient temperature of -7.1°C. A surplus biogas was used to fuel a 10kW engine generator to produce electricity and heat from condenser water was collected as hot water to maintain the digester slurry temperature. Fertilizer nutrients in the slurries are recovered after digestion process. Total Kjeldahl N added to the digester with the influents was completely recovered. Large increases in the concentrations of NH4-N during digestion were attributed to the mineralization of influent organic N. Coliform bacteria in the slurries declined to low or undetectable numbers after digestion process.View full abstractDownload PDF (664K) -
An example of protein analysis in petunia grown under different light qualitiesLimi OKUSHIMA, Yumiko IWAHASHIM, Sadanori SASE, Naoya FUKUDA2000 Volume 31 Issue 3 Pages 185-190
Published: December 25, 2000
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSUnder artificial environment, such as plant factory, screening environmental factors which affect strongly to the plants is expected to be useful. To search a screening method of the environmental factors, two-dimensional electrophoresis of leaf proteins was applied to analyze the different environmental conditions as a trial. Proteins were extracted from the leaves of petunia plants grown under two different kinds of light quality; white and yellow lights. Maps of the two dimensional electrophoresis showed several different printings between white and yellow lights. The result showed the possibility that two dimensional electrophoresis of leaf proteins could be one of the screening methods for the environmental factors. For the correct comparison of maps, standard procedures to extract, separate and analyze multi protein samples under the same experimental condition should be needed.View full abstractDownload PDF (3551K)
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