• Journal of agriculture & life science
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• v.46 no.6
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• pp.67-74
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• 2012

A study was conducted to examine the effect of precooling and storage temperatures on the storage life of 'Maehyang' strawberry for export. Fruits at a 80% ripe stage were harvested from a commercial greenhouse in Gyeongsangnamdo Jinju on January 11, 2011. Fruits were precooled at 0, 2, $4^{\circ}C$ for 2-5 hours, and then transported for about 30 minutes. And stored in set chamber at 4, 8, $10^{\circ}C$, immediately. Fruits were examined for their changes in weight, hardness, Hunter color values, soluble solid content (SSC), acidity, and incidence of gray mold (Botrytis cinerea) during storage. The fresh weight decreased during storage at all temperatures. Especially, strawberry treated the lowest precooling and storage temperatures was the greatest in quality. The hardness was drastically decreased in precooled at $4^{\circ}C$ and stored at $10^{\circ}C$ after storage 10 days. SSC was the greatest when strawberry stored at the lowest temperature. Acidity increased during storage at all temperatures. But in the last day after storage, the strawberry of precooled at $4^{\circ}C$ and stored at $10^{\circ}C$ was the highest as 0.7%. Gray mold was the greatest at $10^{\circ}C$ storage temperature. The results indicate that effectiveness for keeping the freshness was best achieved by precooling at $0^{\circ}C$ and storage at $4^{\circ}C$.

• Journal of agriculture & life science
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• v.45 no.2
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• pp.29-34
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• 2011

This study was carried out to investigate the flower yield and quality of Lilium Oriental Hybrids as affected by planting date. In cut flower production experiments, effect of planting date and bulb source was studied in rain shelter houses with 30% shading. Four planting dates compared were May 15, June 5, June 25, and July 15. Bulbs used for cut flower production were either imported or produced domestically. The greatest cut flower yield and quality were obtained from bulbs planted either on May 15 or June 25. Bulbs planted on July 15 produced cut flowers of very poor quality and yield, due to high temperatures during the planting time. Therefore, for planting in July, means other than 30% shading have to be adapted to lower temperature during early growth stage. Although plants from imported bulbs had better growth and cut flower yield as compared to domestic bulbs, there was no significant difference.

• FLOWER RESEARCH JOURNAL
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• v.16 no.2
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• pp.107-111
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• 2008

This experiment was carried out to examine the effect of silicate on the rooting of cuttings and growth of cut chrysanthemum. In the first experiment, cuttings of chrysanthemum 'Pink Pixie Time' were grown in a 3 L medium which was supplemented with silicate at 0, 30, 60, or 90 g for examination of its effect on rooting of cuttings. In the second experiment, chrysanthemum 'Backwang' was grown in medium supplemented with silicate at 0, 60, 90, 120 or 240 g per 20 L medium. In the first experiment, the promotional effect of silicate increased with increasing silicate concentration in the medium, resulting in increased length of shoot and root. However, root dry and fresh weights were not affected by silicate concentration in the medium. In the second experiment, number of branches, plant height, number of nodes, and stem diameter in the silicate-supplemented treatments were greater than those in the control. However, dry matter was not affected significantly by silicate concentration in the medium. Fresh weights of the leaf, stem and root in the silicate-supplemented treatments were greater than those in the control.

• Journal of agriculture & life science
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• v.45 no.3
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• pp.43-51
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• 2011

This project was conducted to measure actual temperature, relative humidity (RH), and light intensity at different apartment floors and to suggest suitable indoor plants by investigating morphological changes of Treophelosparmum asiatioum and Fittonia verchaffeltii var. argyroneura as affected by light intensity. Temperature and RH in apartment verandas were measured in three different (2nd, 9th, and 16th) floors on three different buildings for 30 days seasonally. The light intensity, temperature, and RH were recorded outside (parking area) and inside apartment verandas for 24 hours on a selected sunny summer day (between Aug. 19 and Sept. 14, 2008). Based on the first study, we investigated effect of simulated light intensity (40, 70, 100, and $600{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$) on changes in growth and development of T. asiatioum and F. verchaffeltii var. argyroneurain growth chambers. However, daily mean light intensity of 2nd, 9th, and 16th floors was different each other as it was about 40, 70, and $100{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, respectively. In the growth chamber experiment, plant height, internode length, and leaf length and width were not affected significantly by light intensity, but changes in leaf color were apparent in the new leaves with the increasing light intensity. The results suggest that T. asiatioum could be best fit to high, and F. verchaffeltii var. argyroneura to lower floor verandas, considering their aesthetic values.

• Journal of People, Plants, and Environment
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• v.22 no.4
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• pp.385-393
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• 2019

The purpose of this study was to investigate the effects of forest activities on the cortisol concentrations in the body and emotional vocabulary of kindergarteners. The participants were 36 kindergarten children aged 4-5, 17 in the control group and 19 in the experimental group. Forest activities consisted of six steps according to the level of kindergarteners, and the program was carried out at G City Environment Training Institute. Before and after the experiment, the children's emotional vocabulary was self-reported and salivary cortisol was analyzed to evaluate changes in the body's stress hormones. As a result, in the control group, positive words increased significantly from 0.14 to 1.53 (p=.003), but the decrease in negative words was not significant (p=.059). In the experimental group, positive words increased significantly from 0.47 to 2.84 after forest activities (p=.000). Negative words decreased significantly from 1.94 to 0.00 after forest activities (p=.000). In the analysis of salivary cortisol, the change in salivary cortisol concentrations was not significant (p=.667) in the control group, merely decreasing from 0.179 ㎍/dl to 0.161 ㎍/dl. However, the experimental group showed a significant decrease from 0.202 ㎍/dl to 0.161 ㎍/dl after forest activities (p=.049). These results suggest that forest play activities may be helpful in encouraging young children's emotional development by increasing positive vocabulary and decreasing negative vocabulary and reducing stress in kindergarteners.

• Current Research on Agriculture and Life Sciences
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• v.10
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• pp.117-123
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• 1992

Twenty and 24 lines selected from Korean local cultivar, Kalmi and Punggak, respectively, were grown in the University experiment farm to select promising lines for recurrent parent in a backcross breeding program for incorporation of resistance to Phytophthora capsici and Xanthomonas campestris pv vesicatoria into the Korean local cultivars. All the selections of 'Kalmi' and 'Punggak' were relatively late in maturity and the range of the variation was wider in the selections of 'Kalmi' than in those of 'Punggak'. Many of the selections from 'Kalmi' were vigorous, high in sugar content, and tolerant to virus in the field. Many of the selections from 'Punggak' were bearing large fruits with thick pericarp and high milling percentage. Line 6, 9, 14, 18 of 'Kalmi' and line 14, 16, 18 of 'Punggak' were selected as promising lines for recurrent parent in the backcross program.

• Journal of Environmental Science International
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• v.32 no.10
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• pp.713-722
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• 2023

This study was conducted to examine the effects of care farming activities on the brain waves of adults with developmental disabilities from September 2022 to December 2022, with a total of 16 sessions held once a week. For 28 adults with developmental disabilities, 15 participants in the care farm program and 13 participants who did not participate were used as the control group. Before and after the care farming activities, participants' self-esteem, happiness levels, and brain function indices were measured through surveys and electroencephalography (EEG). Consequently, the self-esteem of the participants in the experimental group significantly increased after the activity, and as for the brain function index, the left brain activity index related to stress, attention, brain function, and emotional state increased compared to the control group in the experimental group of adults with developmental disabilities, especially intellectual disabilities. Notably, the effect of care farming activities was greater for women than for men with intellectual disabilities. Therefore, considering the differential effects of care farming activities based on the type of developmental disability and sex, it is deemed advantageous to primarily apply these activities to women with intellectual disabilities in order to maximize the healing effect of care farming.

• Bulletin of the Korean Chemical Society
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• v.32 no.10
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• pp.3675-3681
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• 2011

Fusarium oxysporum, an important pathogen that mainly causes vascular or fusarium wilt disease which leads to economic loss. Disruption of gene encoding a heterotrimeric G-protein-${\beta}$-subunit (FGB1), led to decreased intracellular cAMP levels, reduced pathogenicity, colony morphology, and germination. The plant defense protein, Nicotiana alata defensin (NaD1) displays potent antifungal activity against a variety of agronomically important filamentous fungi. In this paper, we performed a molecular modeling and docking studies to find vital amino acids which can interact with various antifungal compounds using Discovery Studio v2.5 and GRAMMX, respectively. The docking results from FGB1-NaD1 and FGB1-antifungal complexes, revealed the vital amino acids such as His64, Trp65, Ser194, Leu195, Gln237, Phe238, Val324 and Asn326, and suggested that the anidulafungin is a the good antifungal compound.The predicted interaction can greatly assist in understanding structural insights for studying the pathogen and host-component interactions.

• FLOWER RESEARCH JOURNAL
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• v.19 no.1
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• pp.1-7
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• 2011

This study was carried out to establish a production system of cut flowers and bulbs of oriental hybrid lilies in highland in summer. In study, effect of cultivation type and shading was examined. The cultivation types used in the bulb production experiments were greenhouses with no cover, greenhouses with net screen (net screen house), and greenhouses with EVA roof cover and net screen sides (rain shelter house). Net screen and rain shelter houses had either 0 or 30% shading. Cultivation type had significant effect and shading had a minor effect on bulb production. The greatest yield and quality of produced bulbs were obtained in the rain shelter house with 30% shading. From the results of this study, it is concluded that dispersed production of high quality cut lily flowers and bulbs could be achieved during the summer in highland.

• Journal of Bio-Environment Control
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• v.25 no.4
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• pp.351-358
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• 2016

This study investigated the effect of different relative humidity (RH) regimes on graft healing of grafted seedlings of watermelon (Citrullus vulgaris Schrad.). Two watermelon cultivars ('Speed' and 'Sambok Honey') were grafted onto the 'RS-Dongjanggun' bottle gourd rootstock (Lagenaria siceraria Stanld.) and the grafted seedlings were maintained under one of three relative humidity regimes, 95-96% [1.1-0.8 (day) or $0.8-0.6(night)\;g{\cdot}m^{-3}$ vapor pressure deficit (VPD)], 97-98% [ 0.7-0.4 (day) or $0.5-0.3(night)\;g{\cdot}m^{-3}$ (VPD)], or 99-100% [0.3-0.0 (day) or $0.2-0.0(night)\;g{\cdot}m^{-3}$ (VPD)] according to the Mollier diagram based on the air temperature of $25^{\circ}C\;day/18^{\circ}C\;night$ with 16 h photoperiod per day. Among the RH treatments, 97-98% significantly increased plant height and fresh weight of the rootstock and scion of the 'Speed' and it also enhanced the graft union connection of both cultivars after two days of grafting. However, plant height and thickness of the scion of 'Sambok Honey' was increased by the 99-100% RH treatment. Furthermore, both cultivars grown in the 95-96 and 97-98% RH treatments consisted of lower levels of endogenous $H_2O_2$ and less activities of antioxidant enzymes which illustrated the occurrence of less oxidative stress. Hence, the results of this study identified the optimal RH level for the graft healing of watermelon seedlings.