• Journal of Bio-Environment Control
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• v.31 no.3
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• pp.212-220
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• 2022

When it comes to single node leafy stem cuttings of rose (Rosa hybrida), environmental management such as air temperature, relative humidity, and light affect productivity. In order to investigate the effect of air temperature and relative humidity on the cutting success rate and rooted cuttings quality, a transparent airtight box was used to implement a closed system. We have also tried to find out the most effective photoperiod and the number of leaflets in closed system using artificial light (white LED, 104.0 µmol·m^-2·s^-1 photosynthetic photon flux density). The first experiment was conducted for a total of 6 weeks under 4 airtight period conditions. The number of roots and longest root length decreased as the airtight period increased. But there were no significant differences in the survival rate, shooting rate, and rooting rate according to airtight periods. In the second experiment the results indicated that survival and shooting rate were significantly affected by the photoperiod (0/24, 2/22, 4/20, 8/16, and 16/8 h), the number of leaflets (0, 2, and 4 leaflets) of the cuttings and their interaction. The survival rate was the highest in the 16-h day length and 4 leaflets. By considering survival rate and shooting rate with energy efficiency, the 8-h day length and 2 or 4 leaflets were judged to be the most effective.

• Korean Journal of Plant Resources
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• v.30 no.1
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• pp.29-37
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• 2017

The effect of packaging materials on the quality and physiological activity of Angelica acutiloba leaves during storage at $4^{\circ}C$ for 20 days and after being transferred to room temperature for 2 days was studied. The experiment was conducted using three packaging materials: the corrugated box (control); corrugated box with $20{\mu}m$ HDPE perforated film liner; and corrugated box with paraffin wax coated paper $+20{\mu}m$ HDPE perforated film liner. Changes in weight, color, aroma, overall visual quality, antioxidant activity, and total flavonoids were investigated. Based on the result, the treatments using corrugated box with $20{\mu}m$ HDPE perforated film liner and the corrugated box with paraffin wax coated paper $+20{\mu}m$ HDPE perforated film liner, were effective in minimizing weight loss, and maintaining external color and overall quality as compared to corrugated box only (control). The corrugated box with paraffin wax coated paper $+20{\mu}m$ HDPE perforated film liner was more effective in maintaining antioxidant activity and total flavonoids than other treatments. Prolonging the freshness using corrugated box with paraffin wax coated paper $+20{\mu}m$ HDPE perforated film liner could increase the marketability of Angelica acutiloba leaves in the domestic market.

• Food Science and Preservation
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• v.22 no.2
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• pp.182-189
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• 2015

Four different kinds of coffee beans (CS, Colombia supremo; EY, Ethiopia yirgacheffee; IM, Indonesia mandheling; and IMM, India monsooned malabar) were roasted at 200 and $250^{\circ}C$ for 10, 15, and 20 min. To determine the optimum roasting conditions, various components of the coffee beans such as pyrazines produced during the roasting, and their antioxidant and antidiabetic effects were analyzed. The different roasting condition did not affect on the concentration of caffeine. However, the amount of 5-caffeoylquinic acid and the total phenolics decreased significantly, at a greater temperature and a longer roasting time. The greatest amount of pyrazines was produced from the IMM however, the amount of pyrazines decreased rapidly at $250^{\circ}C$ according to increasing in roasting time. The DPPH free radical scavenging activity was mostly 80% more effective than that of BHT and ${\alpha}$-tocopherol activities at the same concentration. In the case of the FRAP assay, the reducing power of the coffee slightly decreased at a greater temperature pand longer time. While the inhibitory effect on ${\alpha}$-glucosidase was negligible, the activity decreased by more than 80% when the coffee beans were roasted at $250^{\circ}C$ for 20 min. The inhibitory effect on ${\alpha}$-amylase showed similar results. Taken together, the optimum roasting conditions were determined to be $200^{\circ}C$ and 15 min, which provided the best physiological activity and nutty and chocolatey aromas from the pyrazine of coffee.

• Journal of Bio-Environment Control
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• v.24 no.1
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• pp.27-33
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• 2015

High temperature stress in summer season at plastic house is a limiting factor for tomato fruit set and yield. This study was performed to assess the effects of gibberellic acid ($GA_3$) and 2,4-Dichlophenoxy acetic acid (2,4-D) spray on fruit set, yield, and quality of tomato cv. 'Adoration'(Enza Zaden Co., Ltd.) under the plastic house in Hwacheon, 2011. Four concentrations (0-, 5-, 10- and $15mg{\cdot}L^{-1}$) of $GA_3$, and three concentrations (0-, 5- and $10mg{\cdot}L^{-1}$) 2,4-D were sprayed in early flowering of tomato in the plastic house, and fruit set, yield and quality characters were observed. The results showed that spray of $10mg{\cdot}L^{-1}$ $GA_3$ significantly increased the fruit set by 14.2% than unsprayed. The spray of $GA_3$ significantly increased the marketable fruit number, fruit weight, and yield. The spray of 2,4-D on blossoms significantly affected the fruit set percentage, fruit weight, marketable fruit weight and yield, and the highest fruit set observed as 62.5% in combined spray of $GA_3$ and 2,4-D at each $5mg{\cdot}L^{-1}$. Fruit size and total soluble solids significantly varied with the concentrations of $GA_3$ sprayed. The result indicates that the spray of $10mg{\cdot}L^{-1}$ $GA_3$ and $5mg{\cdot}L^{-1}$ 2,4-D can be more economic and effective to increase the fruit set, and yield in tomato under high temperature condition in plastic house.

• Journal of the Korean Society of Food Science and Nutrition
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• v.9 no.1
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• pp.15-22
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• 1980

In this study, two species of algae, Ecklonia stolonifera, Sargassum thunbergii and one species of marine plant, Zostera marina(rhizoid and stem) were collected and extamined to determine the extractability of water soluble protein and the influences of various factors including extraction time, temperature, ratio of sample vs solvent and pH upon the extractability were tested. The effects of precipitation treatments for isolation of algal protein from the extracts(TCA treatment, methanol treatment and pH control) were also tested. Amino nitrogen and total nitrogen of purified samples made by obtained optimum conditions were estimated. The effect of the ratio of sample vs solvent on extractability differed from species to species which was enhances at 1:100(w/v) in Sargassum thunbergii and Zostera marina while 1:150(w/v) for Ecklonia stolonifera. The effect of extraction time and temperature was revealed differently in all species which might be considered to be caused by differences in the constitution of algal tissues. But in case of TCA insoluble nitrogen, it was showed the maximum extractability at $40-50^{\circ}C$ for 1 hour extraction. The optimum pH for the ext action of total nitrogen was 9-12 while the optimum pH was 6-7 for TCA insoluble nitrogen. And the pH control appeared to be most effective in the influence of precipitation treatment for isolation of algal protein.

• Food Science and Preservation
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• v.13 no.1
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• pp.8-12
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• 2006

The effects of packaging treatments with either low density polyethylene (LDPE) or polypropylene (PP) films on the quality of leaf lettuce were evaluated. It was also stored within a plastic bag (LDPE and PP films) with 4 pelf orated holes (6mm diameter). Changes in weight loss, color difference, anthocyanin, chlorophyll, water content, and general appearance (shape of lettuce) ware investigated Total weight of leaf lettuce packaged within non-pelf orated films decreased slowly over the storage periods at 5 and $20^{\circ}C$. The weight loss of leaf lettuce showed no significant difference between non-pelf orated and perforated films at $20^{\circ}C$. General appearance in leaf lettuce stored at $20^{\circ}C$ was not significantly affected by packaging treatments with LDPE and PP films. The shelf life of non-packaged leaf lettuce at $5^{\circ}C$ was 8 days, whereas packaging treatments with LDPE and PP films showed freshness in leaf lettuce for 30 days of storage. Total chlorophyll and water contents of leaf lettuce packaged within pelf orated and non-pelf orated films decreased gradually during storage. However, no remarkable changes in color difference, levels of chlorophyll and anthocyanin, and water contents were observed in leaf lettuce packaged within perforated and non-pelf orated films. In this experiment, leaf lettuce packaged within LDPE or PP films without any punching holes at $5^{\circ}C$ was the most desirable for extending the quality. These results suggest that non-pelf orated packaging treatment in combination with low storage temperature could be effective in prolonging the shelf life of leaf lettuce

• Journal of the Society of Cosmetic Scientists of Korea
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• v.48 no.3
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• pp.255-264
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• 2022

The active ingredients of Napttegi Kong(GML, Glycine max landrace), a type of native rare soybeans, were identified, and an ultrasonic extraction method was introduced as an eco-friendly extraction method. Through the component analysis of the Napttegi Kong extract, the epicatechin, which was not found in conventional soybeans, was identified. For effective extraction using ultrasonic, the main extraction conditions were optimized using the response surface analysis method. Through the Box-Behnken design process, 15 experiments were conducted with the extraction temperature, the ratio of extraction solvent/solution, and extraction time as key independent variables. A quadratic regression equation for the two dependent variables, epicatechin content and total isoflavone content, was derived, and the coefficients of determination were found to be high as R² = 0.9939 and R² = 0.9844, respectively, confirming that the correlation showed high significance. The extraction conditions satisfying the maximum expectations of these two dependent variables were predicted. to be 40.4℃ of extraction temperature, 19.3 times of extraction solvent/solution, and 91 sec of extraction time. The expected value and the actual experimental value of the epikatechin content and the total isoflavone content were similar, so it was confirmed that this experimental method is a highly reliable optimization model.

• Journal of Biosystems Engineering
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• v.2 no.2
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• pp.37-45
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• 1977

Solar energy is a potential source of power that offers much promise being used for low-temperature applications like drying farm crops, space heating, and water heating for domestic uses. Already much of it are being used for those purpose in foreign countries. However, very little research has been done to determine the possibility of using the solar energy in Korea. This study was conducted to develop the general prediction equation of the total radiation on a horizontal surface in Daejeon area based on 5 years 91972, Jun.1-1976. Dec.31) meteorological data (bright sunshine hours, average total horizontal radiation), and to obtain experimentally the thermal efficiency of solar air and water collectors, which will be used as a basic data of designing flat-plate solar collector system.In addition to the thermal efficiency of the collectorsthe relationship among those factors affecting it such as weather condition, orientation factor, and tilted angle of collector was analyzed. The results of this study were as follows. 1. The general predicted equation of the total radiation on a horizontal surface in Daejeon area based on bright sunshine hours was developed as $H_{av} =(1.546\frac{n}{N}-0.582)H_o$. Predicting the total radiation on a horizontal surface by the above equation was thought to be possible because to values of 0.882 was smaller than any t values at above 0.05 level on the basis of two tailed test of the difference between the calculated and the recorded values. 2.It was observed that optimum tilt angle of the collector in the summer and the autumn drying season was 13 degrees and 51 degrees respectively, these values could be obtained by adding or substracting approximately 25 degrees from the latitude of this area $(36.3^{\circ}N)$ .The relationship between orientation factor and declination of sun at suitable tilt angle of 33 degrees $(s=0.9\O)$ was shown at Fig.4. 3.The thermal efficiency of solar wdter collector was shown 13.4-51. 6% on Aug. 15 (the minimum radiation recorded) and 43.8 ~537% Aug.20 (the maximum radiation recorded), and 13.8~ 46.6 and 44.3~ 49.7 were shown on each corresponding day. 4.The thermal efficiency of the collectors according to the weather condition was shown a big difference of about 10% between the day of the maximum radiation recorded and the minimum, but the differen of efficiency between the air and the water collector was at most 2 ~ 3%. 5. Even if the efficiency of the solar water collector was a little higher than the solar air collector, for drying farm products, the solar air collector was thought to be more effective because the air heated by collector could be directly used for drying them.

• Applied Chemistry for Engineering
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• v.25 no.4
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• pp.363-367
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• 2014

In this study, the dietary fiber contents of Mozuku (Cladosiphon novae-caledoniae kylin) residue and the extraction condition (HCl, $H_2SO_4$, NaOH, $Na_2CO_3$, $Na_2EDTA$) of the dietary fiber was investigated. We examined that the contents of the total polyphenols and flavonoids in the dietary fiber from Mozuku residue, and the potent anti-cancer effect was also tested through the growth inhibition in human colon cancer cells (HT-29) in vitro. It was effective to extract soluble dietary fiber with 1.5% $Na_2EDTA$ and 0.05 N HCl in Mozuku residue. The extraction time and temperature affected the yields of soluble dietary fiber. The contents of the total polyphenols and flavonoids in the dietary fiber from Mozuku residue were the highest in 1% NaOH extract (Total polyphenols $34.4{\pm}0.055$ mg gallic acid/g dry basis, total flavonoids $34.7{\pm}0.023$ mg naringin/g extract dry basis). In DPPH radical scavenging activity, 1% NaOH extract showed the most potent antioxidant activity. In the result of viability in human colon cancer cells, growth inhibition was observed in D.W., 0.05 N HCl, and 0.5% $Na_2CO_3$ extracts in a dose-dependent manner. These results demonstrated that soluble dietary fiber from Mozuku residue significant antioxidant activity and anticancer in human colon cancer.

• Journal of Aquaculture
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• v.6 no.4
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• pp.295-310
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• 1993

As a part for the development of effective mass production techniqne of the puffer, Takifugu rubripes. seedfish, an investigation was carried out in 1989. 1991 and 1992 to determine the optimum starting feeding time of rotifers as a starting food for the fish larvae, and to find out the influences of the light intensitiy and LD cycles on the Artemia consumption by the larvae. The optimum starting time of feeding with rotifer. Brachionus Plicatilis was 2nd to 5th day from hatching resulting in survival of $96.5\~90.0\%$. Optimum light conditions for maximum feeding for fish larvae with Artemia were 1000 lux in 6mm, 600 lux in 8mm, and 200 lux in total length of 10-12 mm larvae. Relationship between total length (X: mm) of fish (6-12 mm in total length) and light intensity (Y: lux) for maximum feeding was:Y=2200-200X (r=-1.000). Relationship between days from hatching (X) and total length (Y: mm) of puffer fry was :Y=1.6427+0.2540X(r=0.9814) for 3 to 36 days after hatching, Y=-33.1452+1.1867X(r= 0.9854) for 36 to 68 days after hatching. Survival rate for 68 days after hatching was $24.1\%$ and the range of water temperature during this period was $21.25\pm1.67^{\circ}C$.