• Title/Summary/Keyword: green mold

검색결과 142건 처리시간 0.037초

유리 금형용 다공질 소결재의 제조에 관한 연구 (A Study on the Fabrication of Porous Sintered Materials for Glass Mold)

  • 장태석;임태환
    • 한국산학기술학회논문지
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    • 제6권6호
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    • pp.468-472
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    • 2005
  • 유리병의 제조에 있어서 유리 융체가 금형 벽면에 부착하는 것을 방지하기 위하여 성형할 때마다 금형 내벽면을 윤활제로 도포하는 공정이 있다. 금형 벽면을 통기성이 있는 다공질 소결체로 제조하면 도포공정을 생략할 수 있다. 따라서 본 연구에서는 스테인리스 중에서 내열${\cdot}$내마모 특성이 가장 우수한 310L계 조대 분말($-150{\mu}m$) 및 420J2 계 미세 분말($40{\~}50{\mu}m$)을 사용, 유리 금형용 내벽면 재로서 가장 적합한 다공질 소결체(소결체의 밀도: $85{\~}90\%$)를 제작하기 위하여 성형압력, 소결 분위기, 소결온도 및 시간을 변화시켜 다음과 같은 결과를 얻었다. (1) 고상 소결로서는 입자 크기가 큰 310L분말을 가지고는 어느 경우에 있어서나, 목적하는 소결 밀도를 얻을 수 없었다. (2) $2ton/cm^2$의 성형압력으로 성형한 실형상 성형체를 양산용 진공($1300^{\circ}C$, 2시간) 소결로에서 소결한 결과, 소결체의 밀도는 $310L+0.03\%B$, 420J2, 420J2+(0.03, 0.06)$\%$B에서 각각 6.2(79$\%$), 6.6(86$\%$), 7.3(95$\%$), $7.6(99\%)g/cm^3$로 나타났다. 따라서, 420J2계 분말(저압성형) 및 310L+0.03$\%$B(고압성형)분말을 사용하여 진공 중 소결하면 목적하는 통기도를 가진 소결체를 제작할 수 있다는 것을 알았다.

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Established marginal seeding period for green cotyledon black soybean (Seoritae) cultivation in Chungbuk province of Korea

  • Yun, Geon-Sig;Hwang, Se-Gu;Hong, Seong-TaeK;Hong, Eui-Yon;Kim, Hong-Sig
    • 한국작물학회:학술대회논문집
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    • 한국작물학회 2017년도 9th Asian Crop Science Association conference
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    • pp.305-305
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    • 2017
  • Seoritae with green cotyledons refers to Korean native black beans harvested when the frost falls because the maturity is late. It is one of the beans preferred by consumers because of its softness and high sugar content. Because of late maturity, if the agricultural work is delayed by weather or agricultural schedule in green cotyledon black soybean (Seoritae), it affects seriously harvest and yield of soybeans. The aim of this study was to investigate the marginal seeding period on June 30, July 10 and July 20 in Cheongju and Jecheon area in Korea to produce stable soybean yield. The yields of green cotyledon black soybean as seeding date in Cheongju area are as follows: Seolitae (Yeoncheon), Seoltae (Goesan) and Seoritae (Gogseong), which increased by 23%, 56%, 23% and 40%, respectively, compare to July 10th to June 30th. As soybean sowing is delayed, the quality of soybean seeds has decreased due to the increase of immature seeds and fungal damaged seeds. The contents of anthocyanin in Cheongju area a functional substance of soybeans, was high on July 20 for Heukcheong, on June 30 for Seolitae (Yeoncheon), on July 10 for Seoritae (Goesan). The yields of Heukcheong and Seolitae (Yeoncheon) in Jecheon area were increased by 5% and 17%, respectively, compare to July 10th to June 30th, while Seolite (Goesan) and Seolite (Gogseong) were high in yields on June 30th. Similarly in Cheongju area, as the sowing period is delayed, the number of immature and mold damaged seeds in Jecheon area increased. The contents of anthocyanin in Jecheon area was high on July 10 for Heukcheong, on June 30 for Seolitae (Yeoncheon) and Seolitae (Goesan). From the above results, Sowing marginal date of green cotyledon black soybeans (Seolitae) in Cheongju area increased 30% in sowing on July 10 and increased 2% in sowing on July 20 compared to June 30. And Sowing marginal date of green cotyledon black soybeans (Seolitae) in Jecheon area increased 2% in July 10 compared to June 30, and the yield decreased rapidly on July 20. We have identified the seeding time limit of green cotyledon black bean in Chungbuk province. It will be possible to provide a variety of crop selection after double cropping of farmers. And by knowing the yield and seed quality of soybean according to sowing date, farmers will observe appropriate sowing period of soybeans for high quality. From the viewpoint of consumers, functional substances of Seoritae will meet the desire for health.

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Molecular and Morphological Characterization of Green Mold, Trichoderma spp. isolated from Oyster Mushrooms

  • Choi, In-Young;Hong, Seung-Beom;Yadav, Mahesh C.
    • Mycobiology
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    • 제31권2호
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    • pp.74-80
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    • 2003
  • Isolates of Trichoderma spp. collected from Pleurotus ostreatus and P. eryngii beds, which included loosened substrate compactness and development of green colour, were grouped into three species. The occurrence of different species of Trichoderma was as T. cf. virens(70.8%), T. longibrachiatum(16.7%) and T. harzianum(12.5%). The conidia of Trichoderma spp. were ellipsoidal, obovoid and phialides were bowling pins, lageniform and the length of phialides was $3.5{\sim}10.0{\times}1.3{\sim}3.3{\mu}m$. Phialides of T. cf. virens and T. harzianum were tending clustered, but it was solitary disposition in T. longibrachiatum. T. cf. virens was characterized by predominantly effuse conidiation, sparingly branched, and fertile to the apex and it was penicillate type. RAPD analysis could detect variability amongst three different species of Trichoderma using two newly designed URP-primers. However, intra-specific variation could not be detected in all the isolates except for rDNA sequence data classified Trichoderma isolates into three distinct groups representing three species. The profiles of rDNA sequences of isolates representing a species showed high similarity in T. cf. virens and T. harzianum. However, there was a variation in rDNA sequences of isolates representing T. longibrachiatum. The results of present study reveals that molecular techniques of RAPD and rDNA sequencing can greatly aid in classification based on morphology and precise identification of fast evolving species of Trichoderma.

Penicillium crustosum에 의한 감 푸른곰팡이병 발생 (Blue Mold of Persimmon (Diospyros kaki) Caused by Penicillium crustosum)

  • 권진혁;박창석
    • 식물병연구
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    • 제9권4호
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    • pp.217-220
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    • 2003
  • 저장 및 유통중인 과실이 약간 함몰되면서 부패되고 그위에 푸른곰팡이가 심하게 발생하였다. MEA배지에서 균총의 색깔은 처음 흰색에서 푸른색을 띄며 분생포자를 아주 많이 형성하였다. 분생포자의 모양은 타원형 또는 아구형이고 크기가 2.6${\sim}$3.8${\times}$2.4${\sim}$3.8 ${\mu}m$이었다. 분생포자병은 균사표면으로부터 형성되고, Stipes의 크기가 86${\sim}$320${\times}$2.8${\sim}$4.3 ${\mu}m$로 가늘고 길며, Rami의 크기가 7.5${\sim}$32.6${\times}$2.6${\sim}$4.2 ${\mu}m$, Ramuli의 크기가 12.4${\sim}$14.8${\times}$3.2${\sim}$3.8 ${\mu}m$, Matulae의 크기는 8.9${\sim}$13.6${\times}$2.8${\sim}$4.6 ${\mu}m$이고, Phialide는 침상이고 크기가 8.2${\sim}$12.4${\times}$2.3${\sim}$3.6 ${\mu}m$이었다. 균사생육적온은 $25^{\circ}C$였다. 분리된 병원균을 건전한 감에 접종한 결과 동일한 병원성을 나타내었다. 이상의 결과로 이 병을 Penicillium crustosum에 의한 감 푸른곰팡이 병으로 명명할 것을 제안한다.

Penicillium expansum에 의한 감 푸른곰팡이병 발생 (Occurrence of Blue Mold on Sweet Persimmon(Diospyros kaki) Caused by Penicillium expansum)

  • 권진혁;정선기;홍승범;채윤석;박창석
    • 식물병연구
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    • 제12권3호
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    • pp.290-293
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    • 2006
  • 저장 및 유통중인 단감 과실에서 Penicillium expansum에 의한 푸른곰팡이병이 발생하였다. 병징은 과실 표면이 약간 함몰되면서 부패되고 그 위에 푸른곰팡이가 발생하는 것이 특징이다. 균총의 색깔은 MEA 배지에서 처음 흰색에서 푸른색을 띄며 분생포자를 많이 형성하였다. 분생포자의 모양은 타원형이며 푸른색으로, 크기가 $2.6{\sim}4.0{\times}2.2{\sim}3.8{\mu}m$ 이었다. 분생포자경은 기중균사나 균사표면으로부터 대부분 형성되고, Phialide는 3-7개의 윤생체가 있으며 단지모양으로 매끈하며 크기는 $8.0{\sim}9.2{\times}2.0{\sim}3.0{\mu}m$이며, Matulae는 2-4개의 윤생체가 있으며 거칠고 크기는 $9.0{\sim}12.6{\times}3.0{\sim}4.6{\mu}m$이다. Ramuli의 크기는 $11.0{\sim}17.6{\times}2.3{\sim}3.0{\mu}m$이고, Rami는 1-2개의 그룹으로 되어 있으며 크기가 $7.5{\sim}32.6{\times}2.6{\sim}4.2{\mu}m$이었다. Stipes에 격막이 있고 매끄러우며 가는 벽을 가졌고 크기는 $56{\sim}302{\times}2.8{\sim}4.0{\mu}m$이었다. 균사생육 적온은 $25^{\circ}C$였다. 병원성 검정결과 동일한 병원성을 나타내었다. 이상 조사한 결과로 보아, 이 병을 Penicillium expansum에 의한 감 푸른곰팡이병으로 명명할 것을 제안한다.

실내에서 관수주기, 토양처리, 배수층이 자생 도깨비고비의 생육에 미치는 영향 (Influence of Irrigation Times, Soil Treatment and Drainage in Indoor on the Growth Response of Cyrtomium falcatum Ferns Korea Native)

  • 주진희;방광자
    • 한국환경복원기술학회지
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    • 제8권1호
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    • pp.73-78
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    • 2005
  • 본 연구는 실내에서의 관수주기, 토양처리, 배수층에 따른 생육과 생리적 반응을 살펴봄으로 써 실내에서 도깨비고비의 적정 생육환경을 밝히고자 수행하였다. 실험구의 관수주기는 2회/주와 7회/주로 하였으며 각 실험구의 세부처리로서 토양처리와 배수층처리는 배수층-피트모스 : 버미큘라이트 : 펄라이트=1 : 1 : 1(D-PVP), 피트모스 : 버미큘라이트 : 펄라이트=1 : 1 : 1(PVP), 배수층-부엽토 : 마사토=1 : 1(D-SL) 그리고 부엽토 : 마사토=1 : 1(SL)로 각각 처리하였으며 그 결과는 다음과 같다. 1. 실내환경에서 도깨비고비는 주 2회 관수처리보다 주 7회 관수처리에서 지상부의 생육은 촉진되었으나 낙엽수 증가로 인해 실내적응성은 감소될 뿐 아니라 황화되는 현상을 보였다. 2. 토양에 있어서는 마사토 : 부엽토=1 : 1처리가 피트모스 : 버미큘라이트 : 펄라이트=1 : 1 : 1처리보다 생육이 양호한 것으로 나타났으나 낙엽수의 증가로 인해 실내적응성은 감소하였다. 3. 배수층에 유 무에 따른 생육에 있어서는, 관수주기와 토양에 관계없이 배수층이 없을 경우 초장과 소엽장이 촉진되나, 실내적응성, 포자엽수, 신엽수는 배수층이 있을 때 더 높은 것으로 나타났다. 4. 생리적 변화에 있어 광합성률은 관수주기, 배수층, 토양처리에 따라 차이를 보였으며 주 2회 관수처리구에서는 배수층이 있는 피트모스 : 버미큘라이트 : 펄라이트=1 : 1 : 1처리에서 가장 높게, 주 7회 관수처리구에서는 배수층이 없는 마사토 : 부엽토=1 : 1처리에서 가장 낮은 것으로 나타났다.

포도 저장을 위한 아황산가스 발생제의 제조 및 처리 방법 (Preparation and Treatment of Sulfur Dioxide Gas Generating Agent for Storage of Grape Fruits)

  • 최성진
    • 한국식품저장유통학회지
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    • 제15권6호
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    • pp.791-795
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    • 2008
  • 아황산가스 발생제를 자가 제조하여 포도의 저장 중 병해발생 방지에 이용하는 방법을 확립하기 위하여 sulfite 화합물의 아황산가스 발생 정도와 지속 기간을 측정하고 아황산가스 발생 조절 및 간이 검출 방법을 개발하였다. 포도의 저장 중 잿빛곰팡이병을 일으키는 B. cinerea의 포자 발아와 균사생장은 각각 400 ppm과 3200 ppm의 아황산가스 농도 조건에서 억제되었다. 5종류의 sulfite 및 bisulfite 화합물 중 sodium hydrosulfite는 아황산가스 발생량이 가장 높았으며 이를 비닐 포장하여 포장의 pinhole수를 조절하거나 산 또는 알카리의 pH 조절제를 혼합하면 가스 발생량과 발생 지속 기간을 조절할 수 있었다. Malachite green 용액은 아황산가스에 의해 정량적으로 탈색되어 아황산가스 검출에 이용할 수 있었으며 여과지에 흡수하여 건조할 경우 아황산가스 검출지로 활용할 수 있었다. MBA 포도를 속효성과 지효성의 아황산가스 발생제를 동시에 처리하여 저온 저장할 경우 병해 발생을 감소시킬 수 있었다.

Wound Healing Potential of Antibacterial Microneedles Loaded with Green Tea

  • Park, So Young;Lee, Hyun Uk;Kim, Gun Hwa;Park, Edmond Changkyun;Han, Seung Hyun;Lee, Jeong Gyu;Kim, Dong Lak;Lee, Jouhahn
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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    • pp.411.1-411.1
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    • 2014
  • This study evaluates the utility of an antibacterial microneedle composed of green tea extract (GT) and hyaluronic acid (HA), for the efficient delivery of GT. These microneedles have the potential to be a patient-friendly method for the conventional sustained release of drugs. In this study, a fabrication method using a mold-based technique to produce GT/HA microneedles with a maximum area of ${\sim}60mm^2$ with antibacterial properties was used to manufacture transdermal drug delivery systems. Fourier transform infrared (FTIR) spectrometry was carried out to observe the potential modifications in the microneedles, when incorporated with GT. The degradation rate of GT in GT/HA microneedles was controlled simply by adjusting the HA composition. The effects of different ratios of GT in the HA microneedles were determined by measuring the release properties. In HA microneedles loaded with 70% GT (GT70), a continuous higher release rate were sustained for 72 h. The in vitro cytotoxicity assays demonstrated that GT/HA microneedles are not generally cytotoxic to chinese hamster ovary cells (CHO-K1), human embryonic kidney cells (293T), and mouse muscle cells (C2C12), which were treated for 12 and 24 h. Antimicrobial activity of the GT/HA microneedles was demonstrated by ~95% growth reduction of gram negative [Escherichia coli (E. coli), Pseudomonas putida (P. putida) and Salmonella typhimurium (S. typhimurium)] and gram positive bacteria [Staphylococcus aureus (S. Aureus) and Bacillus subtilis (B. subtilis)], with GT70. Furthermore, GT/HA microneedles reduced bacterial growth in the infected skin wound sites and improved skin wound healing process in rat model.

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자연치와 복합레진의 색분포에 관한 연구 (STUDY ON COLOR DIFFERENCE BETWEEN NATURAL TEETH AND COMPOSITE RESINS)

  • 김희선;이인복;엄정문
    • Restorative Dentistry and Endodontics
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    • 제26권2호
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    • pp.180-187
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    • 2001
  • The structure of current guides is largely illogical and without any rational use of color ordering. The shade guides are generally made of plastic (rather than the actual composite material) and do not accurately depict the true shade. translucency. or opacity of the composite resin after polymerization. To solve this problem, information based on evaluations of natural teeth and material that use the same method and experimental conditions is necessary. The present investigation measured the color of natural maxillary anterior teeth in vivo and compared the results with those of composite resins. 269 Korean subjects were selected for this study. Intact central incisor. lateral incisor. and canine were selected. The clinical crowns were free of caries or restorations. The middle site of the coronal portion on the labial surface of the tooth was measured by Chroma Meter. The five light activated. resin-based materials (Amelogen, Denfil, Elitefil, Spectrum, Z100) were used in this study. Resin composite was condensed into plastic mold with a diameter of 8mm and a thickness of 4mm. pressed between glass plates to flatten the surfaces. and polymerized using a Visilux II visible light activation unit. The surfaces were polished sequentially on wet sandpaper. Color measurements of each specimen were accomplished by Chroma Meter. A computer program that compares each tooth color with each composite resin color was written and the minimum CIELAB color difference ($\Delta$E$^*$) between tooth and each material was calculated. Under the conditions of this study: 1. Teeth tend to become darker with advancing age. 2. Canines were darker. more yellow. and less green than incisors. 3. The teeth from the women were lighter. more green. and less yellow than the male teeth. 4. In general. composite resins were lighter. more green. and less yellow than teeth. Deficiencies were noted in Hues in YR range. 5. Mean color differences between the five composite resin products and teeth were detectable to the naked eye($\Delta$E$^*$>1.0). 6. In comparing the mean $\Delta$E$^*$ values of materials. Spectrum showed the least followed by Z100, Elitefil, Amelogen, Denfil in increasing order.

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철계 소결 부품의 증기처리에 관한 연구 (A Study on the Steam Treatment of Ferrous Sintered Parts)

  • 임태환;장태석
    • 한국표면공학회지
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    • 제34권6호
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    • pp.568-574
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    • 2001
  • Mixed powders of Fe + 0.7% C, Fe + 0.7% C + 1.6% Cu, and Fe + 0.7% C + 0.3% MnS were pressed in a mold so that the green-compact densities were 6.3, 6.5, 6.7, and 6.9 g/㎤, respectively. Then, the compacts were sintered at $1125^{\circ}C$ for 30 minutes and subsequently steam treated at $600^{\circ}C$ for 60 minutes. From the results, it was found that the overall properties of the steam-treated compacts, such as the weight gain of the sintered compacts, the diffusion of oxides into the sintered compacts, the surface hardness, and the formation of surface oxide layer, were primarily influenced by the density of the compacts and the oxides that were formed on the surface of the compacts by the steam treatment.

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