• 한국의류학회지
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• 제29권7호
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• pp.938-947
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• 2005

Kenaf basts were double retted by using water and enzyme. The best conditions were enzyme concentration $0.125\%$ and 1 day treatment at $50^{\circ}C$, 4 days treatment at $20^{\circ}C$. It was showed that the double rotting could be more economical and eco-friendly than just water rotting or enzyme rotting. Kenaf fibers have been cottonized by removing lignin and hemicellulose partially. In order to cottonize kenaf fiber, lignin of kenaf fibers were removed by sodium chlorite and then hemicellulose of kenaf fibers were removed by sodium hydroxide. The cottonizing phenomenon of kenaf fibers were was confirmed in transversal and longitudinal photograph of SEM. The tensile strength and crystallinity of cottonized fiber were investigated. The tensile strength and crystallinity were lower as the lignin and hemicellulose of kenaf fibers were less.

• 한국식품저장유통학회지
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• 제9권3호
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• pp.277-281
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• 2002

양파의 예건 방법 및 기간이 저장 중 부패에 미치는 영향을 구명하기 위하여 만생종인 창녕대고 품종을 이용하여 1997년~1998년의 2개년 동안 양파를 수확 후 노지 포장과조립식 간이하우스(통풍) 및 조립식 간이하우스(무통풍)에서 1~3일간 예건 후 저장하여 실험하였다. 예건 기간중의 최고기온은 무 통풍 하우스에서 가장 높았고 노지 포장에서 가장 낮았으며 특히 무통풍 하우스에서 1997년 처리 2일째 및 3일째와 1998년 처리 2일째는 41.6$^{\circ}C$이상의 고온을 경과하였다. 수확 후의 양파 수분함량은 90.3~89.5%이었으며, 예건 후에는 1997년에는 0.3~l.8%가 감소되었고, 1998년에는 0.2~2.6%가 감소되었으며, 감량정도는 노지에서 가장 많았고, 통풍하우스에서 가장 적었다. 저장기간 중 최고기온은 1997년이 평균 39.2$^{\circ}C$로서 1998년의 37.1$^{\circ}C$에 비해 높게 경과하였으며, 상대습도는 7월은 1997년에 79.3%로서 1998년의 72.7%에 비해 높았으며, 8월은 1998년이 79.1%로서 1997년의 78.2% 보다 오히려 높게 경과하였다. 처리간 부패 발생은 1997년은 저장초기에 부패가 많이 발생하였으나, 1998년은 저장 중기 이후에 부패가 많이 발생하였으며 1997년에 비해 1998년에 부패가 많이 발생하였다. 총 부패율은 통풍하우스에서 가장 낮았고 무통풍 하우스에서 가장 높았으며, 예건 기간은 길수록 부패경감 효과가 높았다. 이상의 결과를 볼 때 수확 후 저장 중 부패를 경감시키기 위해서는 통풍이 되는 하우스에서 1~2일 예건하거나 노지에서 2~3일 예건하는 것이 효과적인 것으로 판단된다.

• 한국의류학회지
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• 제27권7호
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• pp.862-871
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• 2003

Kenaf has been estimated as an economic and environmentally compatible crop. This study purposed to enlarge the use of kenaf as textile materials and to develope high value-added textile fibers. Kenaf has been cultivated successfully and grown fast in Jeju. The height of kenaf stalks was about 220cm at 105 DAP and 400cm at 150 DAP, After harvesting at 105 DAP and seperating the basts from harvested kenaf stalks, decorticated kenaf basts were rotted in water at 15~$25^{\circ}C$ for biological rotting and were treated with 1%, 4% and 7% NaOH at 9$0^{\circ}C$ for chemical retting. The properties of extracted fibers were compared: such as fiber diameter. Transversal and longitudinal views, colors, crystallinities, strengths and elongations etc. The diameter of kenaf bast fibers was 15~25 ${\mu}{\textrm}{m}$. Biologically rotted kenaf bast fibers had well developed lumens which were diminished after chemical retting. The degree of crystallinities of biologically rotted kenaf bast fiber was about 92~96% showed higher than those of chemically rotting. The biologically rotted fibers were bright and had creamy color. Yelloweness increased at chemically rotted fibers. Fiber bundle strengths were from maximum 98076.9 (gf/g) to minimum 63749.5 (gf/g). Fiber bundle strengths of biologically rotted kenaf fibers appeared greater than those of chemically rotted fibers. Alkali treatments of chemical rotting could make strength lower and elongation higher. Rotting method might be one of the most importance factors affecting to final fiber properties.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 춘계학술발표대회
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• pp.449-452
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• 2000

일반적으로 시중에서 유통되는 콩나물은 시루 채 출하되거나 200-300g 정도의 소포장으로 팔려지게 되며 상품으로써의 생명력도 3-4일 정도로 짧다. 본 실험은 콩나물의 저장 및 유통기간 연장방법의 일환으로 이온수 처리에 따른 저장기간 중의 변화를 조사하였다. $4^{\circ}C$와 $10^{\circ}C$에서의 이온수 처리 콩나물은 1/2 ${\sim}$ 1/3배 정도의 낮은 부패균 밀도를 나타내었으며, 실온과 가까운 $25^{\circ}C$에서도 1/2배의 낮은 부패균 밀도를 나타냄으로써 저온저장에서의 저장성 향상뿐만 아니라 콩나물의 실온유통에서도 하루정도의 저장기간 연장효과를 가져올 것으로 평가된다.

• 한국의류학회지
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• 제32권4호
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• pp.598-607
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• 2008

Bast fibers were applied for various usages from fabrics to household care products long time ago. In this study, we investigated the physical characteristrus of water retted & chemically rotted fibers of Yucca, New Zealand hemp, Corn, Kuzu vine, Indian mallow, and Mulberry paper that have been harvested by domestic cultivation. Water retting is more effective than chemical rotting for six kinds of plant fibers. When all fibers were rotted chemically with 1% sodium hydroxide, only Kuzu vine and Indian mallow were retted. Indian mallow, Yucca, New Zealand hemp, and Com fibers have higher tensile strength than any other fibers. The crystallinity of Kuzu vine, Indian mallow, Yucca, New Zealand hemp, and Corn was as low as 60% but Yucca, New Zealand hemp were flexible. Yucca had fewer lumina whereas New Zealand hemp more lumina in cross sectional shape. Especially com fibers have a structure like sponge, and Indian mallow had a net shape. The longitudinal section of New Zealand hemp showed smooth and long shape. Mulberry paper was proved to be short and thin, which is quite appropriate for making paper. In this study, we found that plant fibers for living material could be used for cloth materials.

• 한국식품저장유통학회지
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• 제8권1호
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• pp.9-15
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• 2001

밤(Castanea crenata, 은기)의 저장특성에 대하여 수침처리와 감마선 조사의 영향을 검토하기 위하여, 수확된 밤을 48시간 동안 수침 처리한 후 0, 0.15, 0.25 및 0.35 kGy의 감마선을 조사하고 $0^{\circ}C$와 95$\pm$2%의 상대습도에서 9개월 동안 저장하면서 품질변화를 측정하였다. 발아현상은 수침 처리된 밤에서만 저장말기에 나타났으며, 감마선을 0.35 kGy 조사한 밤에서는 발아되지 않았다. 수침처리 밤에서는 조사 선량에 무관하게 저장 초반기부터 부패가 발생되어 수침처리 되지 않은 경우보다 저장 9개월 후 약 2배의 부패율을 보였다. 중량감소는 수침 처리된 밤이 무처리 밤보다 적었으며, 조사선량의 영향은 없었다. 과육경도는 수침처리를 하지 않은 경우 감마선 조사에 의해 감소가 억제되었으며, 고선량 일수록 높게 유지되는 경향이었다. 전당함량은 감마선이 조사된 밤이 조사되지 않은 밤보다 저장말기에 높게 유지되었으며 선량에 따른 차이는 없었다. 비타민 C 함량은 감마선 조사 직후 다소 감소되었으나 저장 중 변화는 감마선 조사된 밤에서 완만하게 감소되었다. 가용성 탄닌의 함량은 발아억제 선량 범위의 감마선 조사에 영향을 받지 않았다.

• 미생물학회지
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• 제20권3호
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• pp.119-124
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• 1982

As a basic study to elucidate nutritional physiology and composition of synthetic medium of red rotting bacteria, Erwinia carotovora, of ginseng, the effects of hydrogen ion concentration, various kinds of carbon sources, nitrogen source, micrometallic salts and it's concentration on the gorwth of the bacteria were investigated and the results were as follows. Optimal pH in the basal medium for the growth of the bacteria was 6.5. After incubation the pH in culture media was neutralized. Among the various kinds of carbon sources, sucrose, glucose mannitol, but organic acids were not utilized effectively as nutrients. After incubation the pH turned acidic. Alanine as organic nitrogen sources nad ammonium sulfate as inorganic nitrogen promoted the growth, but L-valine and sodium nitrite were the least effective. Ferric chloride 1.0mg/dl and ferrous sulfate 100mg/dl were the most effective as micrometallic sources. Control and boric acid were the least effective. New synthetic medium based on the above results was follows ; Alanine 1.0g, $KH_2PO_4\;1.0g, \;sucrose\;30.0g, \;MgSo_4{\cdot}7H_2O\;0.5g, \;FeCl_3{\cdot}6H_2O\;1.0mg\;thiamine\;200{\gamma}g$, and distilled water 1000ml, pH6.5.

• Current Research on Agriculture and Life Sciences
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• 제27권
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• pp.43-52
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• 2009

Most soybean sprouts grown in factories are sold on the market. When the soybean sprouts grow up to lateral root initiation, the rate and absolute amount of asparagine in the roots of all sprouts are comparatively low. To extract the greatest amount of asparagine from soy-sprouts, it is advantageous to grow sprouts more than 16 days. When sprouts were grown with ozonic water, it was possible to grow sprouts more than 16 days without any rotting problems. The content of asparagine in the sprouts were proportionally increased up to 16 days. When sprouts were grown in 0.2% of urea, the content of asparagine in sprouts were significantly increased. Soybean sprouts grown at $20^{\circ}C$ room temperature showed the highest yield rate and asparagine content, at the same time.

• Mycobiology
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• 제39권3호
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• pp.230-232
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• 2011

In this study, we characterized sporadically occurring sclerotium rot caused by Sclerotium rolfsii in Chinese chive (Allium tuberosum Roth.) in farm fields in Sacheon, Korea. The initial symptom of the disease was water-soaked, which progressed to rotting, wilting, blighting, and eventually death. Further, mycelial mats spread over the lesions near the soil line, and sclerotia formed on the scaly stem and leaves. The sclerotia were globoid, 1~3 mm, and white to brown. The optimum temperature for growth and sclerotia formation on potato dextrose agar (PDA) was $30^{\circ}C$. The diameter of the hypae ranged from 4 to 8 ${\mu}m$. Clamp connection was observed on PDA medium after 5 days of incubation. Based on the mycological characteristics, internal transcribed spacer sequence analysis, and pathogenicity test, the causal agent was identified as Sclerotium rolfsii Saccardo. This is the first report of sclerotium rot in Chinese chive caused by S. rolfsii in Korea.

• Mycobiology
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• 제38권2호
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• pp.156-158
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• 2010

Stem rot disease was found in garlic (Allium sativum L.) cultivated from 2008 to 2010 in the vegetable gardens of some farmers in Geumsan-myon, Jinju City, Gyeongnam province in Korea. The initial symptoms of the disease were typical water-soaked spots, which progressed to rotting, wilting, blighting, and eventually death. White mycelial mats had spread over the lesions near the soil line, and sclerotia had formed over the mycelial mats on the stem. The sclerotia were globoid in shape, 1~3 mm in size, and tan to brown in color. The optimum temperature for growth and sclerotia formation on potato dextrose agar (PDA) medium was $30^{\circ}C$. The diameter of the hyphae ranged from approximately 4 to $8\;{\mu}m$. Typical clamp connection structures were observed in the hyphae of the fungus, which was grown on PDA medium for 4 days. On the basis of the mycological characteristics and pathogenicity of the fungus on the host plants, the causal agent was identified as Sclerotium rolfsii Saccardo. This is the first report of stem rot disease in garlic caused by S. rolfsii in Korea.