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유길선,안지은,조대철 순천향대학교 부설 산업기술연구소 2017 순천향 산업기술연구소논문집 Vol.23 No.1
Every year growing piles of sea shell wastes from every part of Korean seashores have been a long, lingering problem lacking any concrete disposal or recycling actions. Bioremediation requires a constant or/and at least periodic supply of oxygen on the subsurface area. By that reason oxygen releasing compounds like CaO2, MgO2 and hydroxides could be a good alternative to direct Air/O2 supply. We prepared calcium oxide from oyster shell powder by heating the raw material and slaking with hydrogen peroxide. The product was tested for O2 release after dissolution in water. The releasing rates of O2 were arbitrarily proportional to pH and temperature.
유길선,안지은,조대철 순천향대학교 부설 산업기술연구소 2017 순천향 산업기술연구소논문집 Vol.23 No.1
Industrially prepared bamboo vinegar was tested on a basis of common bacteria. The two bacteria were E. coli and P. aeruginosa. The bamboo vinegar or distillates contains acids and alcohols along with many minor organics, which are believed to be attributed to their anti-bacterial function. Two different specimens were applied to TSB petri dishes to confirm their effect.
유길선,안지은,조대철 순천향대학교 부설 산업기술연구소 2017 순천향 산업기술연구소논문집 Vol.23 No.2
A calcium salt like calcium carbonate can be transformed into a peroxide. Oxidation under extreme heating condition produces a compound with extra oxygen which would be released easily at ambient moisturized atmosphere. We prepared calcium oxides from oyster shell powder, chalk, or gypsum by heating the raw material and slaking with hydrogen peroxide as oxidant in aqueous environment. Those products were experimented for checking O2 releasing capacity after dissolution in water. The releasing rates of O2 were arbitrarily proportional to pH and temperature.
유길선 ( Gilsun Yoo ),안지은 ( Jieun An ),조대철 ( Daechul Cho ),권성현 ( Sung Hyun Kwon ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.9
Bioremediation in situ is heavily dependent on the oxygenic environment which would privide the dwelling microorganism with sufficient oxygen. The situation could be easily resolved with supply of an Oxygen Releasing Compound (ORC). In this paper we prepared that sort of material out of oyster shell powder (mostly calcium carbonate) that prevails every shore areas of the country. We used two different oxidizing methods in the first step of the whole manufacturing process-conventional heating in a furnace and an ultrasound generator to obtain calcium oxide. Then that calcium oxide was further oxidized into calcium peroxide which may release oxygen under a moisturized condition. The oxygen releasing experiments were run to test the performance of our products, and to determine the gas kinetics during the experiments. Interestingly, calcium peroxide derived from ultrasound treatment was much more energy-effective as ORC than that from furnace heating although the heat derived process was better than that of ultrasound in terms of oxygen content and its releasing rate. We also found that most of the data collected from the gas releasing experiments fairly supported an ordinary 1<sup>st</sup> order kinetics to oxygen concentration, which shaped a sharp discharge of oxygen at the very early moment of each test.
서혜영,유길선,서상곤 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.3
Humic substances are produced from decomposing plant materials and have various physico-chemical propertiesthat improve soil environments, making them beneficial to the growth and quality of plants. In this study, we examinedthe effects of fulvic acid and humic acid by foliar or soil application on the yield and quality of potato tubers. Fulvicacid was sprayed onto the leaves of potato plants (cv. Atlantic, Korean name Daeseo) at 50, 60, and 70 days afterplanting with 1000-X, 750-X or 500-X diluted stock solution. Additionally, humic acid was incorporated into soil ata rate of 40 or 80 g∙m-2 with 8 kg of soil-mix before planting potato seeds. There was no significant difference inthe number of tubers, total yield, or chemical composition of tubers treated with fulvic acid, but the weight ofextra-large tubers increased, which resulted in a substantial increase of the incidence of hollow heart. Soil applicationof humic acid had no effect on tuber size, total yield, or other chemical compositions of tubers. However, the 80 g∙m-2 humic acid treatment resulted in increased mineral contents in the soil and tubers and substantially decreasedincidence of hollow heart. Humic acid was believed to be beneficial to increasing P and K contents in both soil andtubers. These findings indicate that fulvic acid and humic acid have no clear promotional effects on tuber growth,but may lead to a high incidence of hollow heart.
서혜영,유길선,서상곤 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.6
This study was conducted to investigate the effects of foliar application of fulvic acid on plant growth,fruit quality, and yield of tomato. Fulvic acid (20 mL) was sprayed on the leaves of tomato plants at 10, 20 and 30days after transplant (DAT) at rates of 0 (control), 0.8, 1.1, or 1.6 g·L-1 in water. The 0.8 g·L-1 treatment led to asignificant increase in plant height and fresh and dry weight, while the 1.6 g·L-1 treatment led to a significant reduction. The contents of P and Ca were increased, but those of most of the other elements were unchanged in response tothe 0.8 and 1.1 g·L-1 treatments. Fruit number and yield of medium- and large-sized fruits were significantly increasedin the 0.8 and 1.1 g·L-1 treatments, which subsequently resulted in an increase of marketable yield. The incidence ofcracking was generally high in all treatments, except for the 1.6 g·L-1 treatment, which showed a significant reductionin cracking and much smaller fruit size. Blossom-end rot was greatly reduced in all fulvic acid treated plants, andno incidence was observed in the 1.6 g·L-1 treatment. Our study demonstrated that foliar application of fulvic acid atabout 0.8 g·L-1 could be used to promote plant growth and increase marketable yield in tomato production.
김병환,문용선,유길선,서상곤 한국원예학회 2022 원예과학기술지 Vol.40 No.6
This study was conducted to investigate the effects of soil drench or foliar spray with a microbial agent, AGN-LTE, on growth and yield of potato (Solanum tuberosum). To accomplish this, soil was drenched with 500 mL of AGN-LTE solution (30 mL stock·L-1) or leaves were sprayed with 50 mL plus 450 mL water drench Soil drench (500 mL) and foliar application at 30 days after planting and two additional times at 15 day increments. The foliage and tuber weights were measured and tubers were graded by size group and counted. Soil drenching with AGN-LTE treatment led to a significant increase in the number of potato tubers and tuber weight. Top fresh weight per plant increased significantly by 50.9% following soil drenching. In addition, the number of plants and tuber weight increased by 49.9% and 32.5%, respectively, following drench treatment. No significant differences were observed between the control and foliar spray treatment. Marketable yield and numbers of small and extra-small tubers increased significantly in response to drench treatment relative to the control and foliar spray treatments. Our results demonstrated that drench treatment with AGN-LTE could be used to promote potato tuber growth and yield during potato production.
재활용 패각의 산-염기치환 반응을 통한 과산화칼슘의 제조와 산소발생 특성
권성현 ( Sung Hyun Kwon ),유길선 ( Gilsun Yoo ),조대철 ( Daechul Cho ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회지 Vol.36 No.2
The Korean coastal sediment area is apt to be contaminated by prevailing aquafarming and inland eutrophic sources. Furthermore, oyster shells are being overproduced every year with little recycling. Oxygen-releasing compounds (ORCs) are paramount in bioremediation or bioaugmentation. Calcium peroxide, one of the primary ORCs, was prepared using recyclable oyster shells via acid?base reactions based on double replacement, and this was followed by oxidation with hydrogen peroxide. Hydrogen peroxide, which is known to be effective as oxidizing agent, required an optimum dose for higher content of oxygen in the final product, because the literature shows that the oxidative reaction is reversible. A variety of concentrations of HCl and NaOH were examined in stoichiometry for the breakdown of calcium carbonates (or CO<sub>2</sub> production) and formation of calcium hydroxide in the initiation reaction. Acid and base overdoses helped the oxygenation reaction to be extended further, thus leading to calcium peroxide with the highest content of oxygen at a combination of 6 N-12 N acid-base treatment. With an elevated temperature, more oxygenated calcium peroxide was likely to be formed. Carbon dioxide and free oxygen during the experiments were determined with DO probing and gas capture in a water bath.