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Volume 33 (2002 - 200･･･
- Issue 4 Pages 217-
- Issue 3 Pages 155-
- Issue 2 Pages 83-
- Issue 1 Pages 1-
Volume 33, Issue 3
Displaying 1-6 of 6 articles from this issue
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Rokhani HASBULLAH, Tetsuya TANABE, Munehiro TANAKA, Takayoshi AKINAGA2002 Volume 33 Issue 3 Pages 155-166
Published: December 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSNear infrared (NIR) spectroscopy in the range of 600-1000nm was studied for its ability to predict the internal quality attributes, such as moisture content, hardness, soluble solid content (SSC), acidity and pH, of the ‘Irwin’ mango (Mangifera indica Linn.) following heat treatment. A total of 63 samples were used for calibration models and 124 samples collected from 62 heat-treated mangos were used for prediction models using partial least squares regression (PLS) and principal component regression (PCR) methods. The results showed that models using the PLS method were better than those using the PCR method. There was an influence of the preprocessing spectra on the prediction performance of the models in which the second derivative of Savitzky-Golay method [D2log(1/R)] resulted in the best calibration models. The correlation coefficients and the SEPs for the prediction of the moisture content, hardness, SSC, acidity and pH of the heat-treated mango were 0.94 (0.384), 0.87 (0.066), 0.94 (0.387), 0.80 (0.053) and 0.83 (0.141), respectively. The average SSC value in the stem-end was significantly higher than that in the blossom-end. The heat-treated mango had significantly higher moisture content, hardness, SSC and acidity levels and had lower pH levels compared to the untreated mango, showing the marked improvement of the fruit quality following the heat treatment due to a reduction in the decline of quality attributes.View full abstractDownload PDF (1391K) -
Development of a simple and quick method for determining major chemical components and properties in whole bloodJie Yu CHEN, Fuminori TERADA, Sumio KAWANO2002 Volume 33 Issue 3 Pages 167-172
Published: December 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSMajor chemical components and properties in whole blood are important indexes for evaluating the nutrition and health conditions of livestock. Therefore, an NIR measuring device called “BloodSpec-1” using fiber optics in interactance mode was developed to perform the simple and quick analysis of whole blood. A blood collecting tube was used as a sample cell. NIR spectra (700-1050nm) of whole blood samples from goats and from milking cows were measured with the developed device. The calibration and validation for determining oxygen, hemoglobin, and hematocrit were performed by using partial least squares (PLS) regression. As a result, the calibration models with relatively high accuracy could be obtained, indicating that the “BloodSpec-1” is useful to perform the quick NIR analysis of whole blood. NIR measurement using a blood collecting tube, as a sample cell, seemed to be useful from a practical point of view.View full abstractDownload PDF (2193K) -
Analysis of air-exchange efficiency in the room equipped with different air-inlet ventilation systemsNorihiro HOSHI, Tomoharu YAMAGUCHI, Yuji OKANEMASA, Takaaki MAEKAWA2002 Volume 33 Issue 3 Pages 173-182
Published: December 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSUsing the dimensionless concentration of virtual air-contaminant as an index of air-distribution in the pig housings, the ventilation characteristics of three rooms in the housing with different air-inlet were compared by the numerical calculation method introducing the terms of volume pprosity and surface permeability mentioned in the former report (part 1). Examined numerically air inlets of the room were the porous diffusion ceiling (porous inlet) and slotted inlet positioned on the gable wall (slotted inlet I) and side wall (slotted inlet II), respectively. The decay mode and slope of the concentration of air-contaminant varied depending on the type of air inlet and each location in a room. The diffusing ceiling inlet gave the unidirectional flow which resulted to the effective displacement ventilation in the room. The slotted inlet gave the main jet flow along the ceiling and substantial circulating flow in the room, which resulted to mix and dilute the inside air with outside fresh air, and the decay slope of the concentration widely varied with different locations in the room. Index of ventilation efficiency was introduced using the decay time ratio of virtual contaminant concentration.
The diffusing inlet showed rather uniform values of the index ranging 1 to 1.9, average being 1.32. The slotted inlet I gave the index values between 0.9 to 1.4, average being 1.09. The ventilation efficiency couldn't be estimated in the case of slotted inlet II, because the dimensionless concentration did not decrease to 1/10 of the initial value within a get time period (240 sec.).View full abstractDownload PDF (4989K) -
Kohei NAKANO, Shigenori MAEZAWA2002 Volume 33 Issue 3 Pages 183-188
Published: December 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSWe discussed the feasibility of low temperature storage at the producing district for cut carnations. Flowers were stored at 5°C for 0, 3, 6, 9 and 12 days from just after harvest, and then transported from Ishiki town, Aichi to the laboratory in Gifu city through collecting center, wholesale market and flower shop. Petals opened slightly during 5°C storage. 0 and 3 days storage flowers treated with 1, 1-dimethyl-4-(phenylsulfonyl) semicarbazide (DPSS) at the collecting center were prolonged vase life. Without DPSS treatment, even 12 days storage flowers have same longevity as non-storage, but the internal states of petals reflected in CAT activities were different. These result indicated that 5°C storage within 3 days was available for cut carnations.View full abstractDownload PDF (835K) -
Effect of hydraulic retention time (HRT) and stirring media in fermentor on acidogenic processWei Zhong JIANG, Yutaka KITAMURA, Noriaki ISHIZUKA, Takehito SHIINA2002 Volume 33 Issue 3 Pages 189-196
Published: December 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA two-phase process can be employed to perform dry methane fermentation using a rotational drum fermentation system (RDFS). In the first phase, the acidogenic process is affected by many factors, such as pH, the organic loading rate, hydraulic retention time (HRT), temperature, and physical characteristics such as the stirring media in the fermentor. In this study, the effects of HRT and the stirring media in the fermentor on acidogenic performance were evaluated via system parameters involving volatile acid (VA) production and volatile solids (VS) degradation under mesophilic conditions. Using fresh soybean meal or okara as substrates, two sequential experiments were conducted with a bench-scale RDFS. The first set of experiments was performed at HRTs of 15, 20, 25, and 30 days. A first order hydrolysis rate constant of 3.7×10-3d-1 calculated at pH values of 4.3-4.8 was less than the previous results. VS degradation and total VA (as acetic acid) ranged from 6.7 to 10.4%, and 13.3 to 16.0g/L, respectively. Results of the second set of experiments showed that the stirring media accelerated the hydrolysis and acidification processes, with Kh values of 5.3-7.2×10-3d-1, and the VA spectrum was also influenced. However, some adverse effects from use of stirring media were also observed in this study.
The combined results indicate that pH values have an important effect on the distribution of un-ionized VA and ionized VA. Simultaneously, accumulation of VA, especially un-ionized VA, inhibits the hydrolysis process regardless of the type of stirring media in the fermentor.View full abstractDownload PDF (988K) -
Limi OKUSHIMA, Yumiko IWAHASHI, Sadanori SASE, Naoya FUKUDA2002 Volume 33 Issue 3 Pages 197-202
Published: December 25, 2002
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSTwo-dimensional electrophoresis of plant protein under starvation of nutrition had been tried to find an index of environmental impact to crops. Three types of tomato nursery plants were sampled. On initial, starvation and recovery stage, plants were cultivated with nutrition until two true leaves expanded fully, then without nutrition for one month and then with nutrition again for two weeks, respectively. The protein spots pattern of each stage was investigated. The spots of three stages showed the same regular pattern and repulsed each other between close distances. The spots counts on the 2-D map location grids were different by the nutrition conditions. On the spots volume distributions of each molecular weight sections, the kurtosis of the starvation stage, which nutrition conditions were very different from the initial and recovery stages, was larger than the initial and recovery stage, which nutrition conditions were same. On the spot volume distributions of each isoelectric point sections, the regression coefficient between initial stage and starvation stage was larger than it between initial stage and recovery stage.View full abstractDownload PDF (2141K)
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