농작물 해충 및 진균류 방제를 위한 방선균의 분리 및 동정

이은정,강경돈,황교열,김두호,김신덕,성수일 한국잠사학회 1998 한국잠사곤충학회지 Vol.40 No.1

Twenty seven out of ca. 5,000 actinomycete strains, which were isolated from soil collected throughout the country, showed antimicrobial effects against fungi, Rhizopus stronifer (ATCC6227a), Rhizoctonia solani (KCCM 11271) and yeast, Candida albicans(ATCC10231). From these antifungal microorganisms, we further selected seven strains which seemed to produce insecticidal substances with in vivo test, using silkworm, Bombyx mori and beet armyworm, Spodoptera exigua. Morphological and biochemical experiments revealed that three strains out of seven were streptomyces. Further investigations on the physical and chemical properties of these antifungal and insecticidal substances are now in progress.

Enhanced Thermal Stability of Polyaniline with Polymerizable Dopants

Choi, Yeol Kyo,Kim, Hyeong Jun,Kim, Sung Ryul,Cho, Young Min,Ahn, Dong June American Chemical Society 2017 Macromolecules Vol.50 No.8

<P>Diacetylene (DA) is an amphiphilic structure and has been studied as a variety of PDA-based chemosensors. However, the prospect of using diacetylene (DA) as dopant of polyaniline (PANT) is yet to be reported. In this study, new amphiphilic PCDA-taurine and PCDA-pBzS dopants were synthesized by changing the primary functional group to a sulfonic group. These polymerizable dopants are photopolymerized by UV irradiation in PANI solution. Thereby we expect to enhance the thermal stability and sustain the conductivity of PANI. The polymerizable dopants were characterized by FT-IR, NMR, and GC-MS. PANI with polymerizable dopants was analyzed by resonance Raman spectroscopy (RRS). The thermal stability and conductivity of PANT were characterized by thermogravimetric analysis (TGA). Comparing the TGA results of PANT doped with general dopants with PANT doped with polymerizable dopants, we found that PANI with polymerizable dopants showed enhanced thermal stability.</P>

뽕잎 함유 대두발효물이 신생 당뇨유도쥐에 미치는 혈당강하효과

황교열(Kyo-Yeol Hwang),김영훈(Young-Hoon Kim),조용석(Yong-Seok Cho),박영식(Young-Shik Park),이재연(Jae-Yeon Lee),강경돈(Kyung-Don Kang),김근(Keun Kim),주동관(Dong-Kwan Joo),안덕균(Duk-Kyun Ahn),성수일(Su-Il Seong) 한국식품영양과학회 2008 한국식품영양과학회지 Vol.37 No.4

당뇨 환자를 위한 기존의 뽕잎 건강식품의 기능을 보완할 목적으로 뽕잎분말과 DNJ 생산균주인 Bacillus subtilis MORI균의 대두발효 혼합물을 신생 당뇨유도쥐에 4주간 경구투여 하여 먹이섭취량, 체중변화, 혈당량, 내당능, 혈중 지질함량, 장기무게 등을 조사하였다. 전체적으로 당뇨유도 시험군은 정상시험군(NC군)과 비교하여 사료섭취량은 많았으나 증체량이 적어 낮은 사료효율을 보였다. 그러나 뽕잎(M군) 및 뽕잎함유대두발효물(MM군)의 투여에 의해 사료효율이 개선되었으며 특히 MM-60군에서 가장 높은 사료효율을 나타내었다. 1주일 간격으로 4주간에 걸쳐 시행한 혈당량 측정 결과 뽕잎이나 뽕잎함유대두발효물의 투여는 공복혈당을 크게 감소시켰으며 특히 MM-60군과 MM-120군은 당뇨대조군(DC군)에 비해 유의적으로 낮게 나타났다. 4주간의 시료투여 후 경구당부하시험에 의한 내당능 조사 결과 뽕잎투여나 뽕잎함유대두발효물의 투여는 혈당량을 꾸준히 감소시켰으며 특히 포도당 투여 후 120분에서의 MM-60군과 MM-120군은 DC군에 비해 유의적으로 낮은 혈당량을 보여 뽕잎 단독보다는 대두발효배양물 첨가에 의해 내당능이 크게 개선된 것으로 나타났다. 혈중 총콜레스테롤 및 중성지질 역시 DC군에서 높은 함량을 나타냈으나 뽕잎이나 뽕잎함유대두발효물 투여에 의해 지질함량이 감소하였으며 그 감량 정도는 총콜레스테롤에서는 MM-60군과 MM-120군에서 그리고 중성지질의 경우에는 M군, MM-60군, MM-120군에서 DC군에 비해 유의적인 감소를 나타내었다. 당뇨 유발에 의해 쥐의 간, 신장, 비장, 심장 등 체내 주요장기의 무게는 크게 증가하였으나 뽕잎 또는 뽕잎함유대두 발효물 투여에 의해 이들 장기의 무게는 대부분 감소하였으며 특히 MM-60군, MM-120군은 DC군에 비해 유의적인 감소를 나타내었다. 이상의 실험결과 뽕잎분말과 DNJ 생산균주인 B. subtilis MORI균의 대두발효물의 혼합물은 신생 당뇨유도쥐의 제반 당뇨증세 완화에 긍정적으로 작용하는 것이 확인되었으며 따라서 뽕잎함유대두발효물은 앞으로 당뇨환자들에 대한 건강식품 소재로 그 활용이 크게 기대된다 하겠다. The effect of fermented soybean culture of Bacillus subtilis MORI mixed with mulberry leaves on the lowering the levels of blood glucose and cholesterol was examined using neonatal streptozotocin-induced diabetic (n-STZ) rats. B. subtilis MORI produces 1-deoxynojirimycin (DNJ), an α-glucosidase inhibitor. The content of DNJ of soybean fermented culture mixed with mulberry was higher (4.1±0.0 ㎎/g dry base) than that (1.5±0.0 ㎎/g) of mulberry. The concentration of 50% inhibition (IC50) against rat intestinal α-glucosidase of soybean fermented culture mixed with mulberry was 5.6±0.1 ㎍/mL and that of mulberry was 17.0±0.5 ㎍/mL. Experimental groups of diabetic rats were randomly assigned to normal control group (NC group), diabetic control group (DC group) and three diabetic groups fed with DNJ food product. One of the three diabetic groups was M group (60 ㎎ DNJ food product/㎏) (DNJ food product containing 30% mulberry) and the other two were MM-60 group (60 ㎎/㎏) and MM-120 group (120 ㎎/㎏) (DNJ-fortified food product containing 30% fermented soybean culture mixed with mulberry leaves). The glucose in serum was significantly decreased in the MM-60 and MM-120 groups fed with DNJ-fortified food product for 4 weeks, compared with DC group. Total cholesterol and triglyceride in serum were also lower in MM-60 and MM-120 groups than the DC group. These results support that the fermented soybean culture of B. subtilis MORI mixed with mulberry leaves improved the metabolism of blood glucose and lipid in the n-STZ rat model.

Conjugated Polymer Nanoparticles in Aqueous Media by Assembly with Phospholipids via Dense Alkyl Chain Packing

Choi, Yeol Kyo,Lee, Dabin,Lee, Sang Yup,Shin, Tae Joo,Park, Juhyun,Ahn, Dong June American Chemical Society 2017 Macromolecules Vol.50 No.17

<P>Revealing the nature of chain packing in conjugated polymer nanoparticles (CPNs) is one of the important issues to polymer physics research. Surfactant-stabilized CPNs in water show significantly enhanced luminescence intensity in comparison to small molecular organic dyes and single polymer chains dissolved in solvents. The importance of the conjugated polymer structure in nanomaterials is undoubted. However, details of the relationship between alignment of conjugated polymer backbone in CPNs and its luminescent property have not been established. Furthermore, there are yet no methods that can predict the atom-resolved structure of conjugated polymer in the CPNs. Herein, we employ coarse-grained (CG) molecular dynamic simulations to investigate the structure of phase-separated film and the film shattering process for a mixture of poly[2,6-(4,4-bis(2-ethylhexyl)-4<I>H</I>-cyclopenta[2,1-<I>b</I>;3,4-<I>b</I>′]-dithiophene)-<I>alt</I>-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) and 1,2-dioctanoyl-<I>sn</I>-glycero-3-phosphocholine (D8PC). The π-π stacked structure of PCPDTBT is significantly enhanced when the ratio of D8PC increases in both dried and water exposed film. We also show that the amount of D8PC is at least 2.5 times larger than that of PCPDTBT to wrap the conjugated polymer chain, and the direct retrieval of atomistic details is achieved through back-mapping from the morphology of CG. Finally, we confirmed that conjugated backbones inside the nanoparticles were completely shielded from the aqueous solution by the dense layers of alkyl chains, resulting in remarkably enhanced chain packing. These simulated results are correlated with experimentally observed structure through UV-vis-near-infrared (UV-vis-NIR) spectrometry, scanning electron microscopy (SEM), particle size analyzer (PSA), transmission electron microscopy (TEM), and grazing-incidence X-ray diffraction (GIXD).</P> [FIG OMISSION]</BR>

신규 통정혐기정 세균으로 제조한 발효흙에 의한 음식물 쓰레기의 퇴비화

황교열(Kyo-Yeol Hwang),이재연(Jae-Yeon Lee),김근(Keun Kim),성수일(Su-Il Sung),한승호(Sung-Ho Han) 유기성자원학회 2001 유기물자원화 Vol.9 No.1

음식물쓰레기 퇴비화를 위한 발효흙 제조를 위하여 토양에서 새로 분리한 Bacillus 속의 GM103, V25, V31, V35 의 4균주를 사용하였다 각 균주를 통정한 결과 각각 Bacillus licheniformis, B. subti1is, B.stearothennophilius, B. subtilis로 동정되었다 이 들 균주들은 단백질 분해능, 전분분해능, 그리고 작물 병원성 곰팡이 Rhizopus stronifeI에 대한 저해능이 모두 우수하였다. GM103은 전분분해능이 탁월하게 우수하였고, 호기적 성장만 가능하였다. V25, V31, V35는 모두 호기적 • 혐기적 성장이 가능하였고, 10% 염분농도와 50℃에서 좋은 성장도를 보였으며 토양에서의 생존 및 적응력도 우수하였다. 음식물쓰레기 퇴비화 시험을 위하여 GM103, V25, V31, V35 균주를 배양하여 당밀, 비트펄프, zeolite 등을 혼합하여 발효흙인 BIOTOP-CLEAN을제조하였다. 제조된 BIOTOP-CLEAN과 무처리구인 대조구 기존 타사 제품 HS와 음식물쓰레기 시험을 하였는데 대조구의 30'C , HS의 35'C 보다 BIOTOP-CLEAN의 경우가 최대 발효온도는 50'C로 가장 높았다. 또한 BIOTOP-CLEAN은 냄새도 구수하였고 성상에 있어서도 짙은 암갈색으로 음식물쓰레기의 퇴비화가 가장 잘 되었다. 한편 대조구는 악취가 나고 HS는 별다른 냄새가 없었다. 각 균주의 배양액을 토마토, 배추, 열무, 고추 등의 작물에 1달주기로 살포하여 무처리인 대조구에 비해 상대적 증산율에서 모두 우수한 것으로 나타났다. Four newly isolated bacteria from soil were used manufacture microbial inoculum food waste. The baaeria, GM103, V25, V31, and V35, were identifed as Bacillus licheniformis, B.sutilis, B. stearothermophilus and B. subtiIis, respectively. The bacterial Strains were effcient to degrade protein and srarch and also able to inhibit the growth of plant pathogenic fungus Rhizopus strinifer. The GM103 showed distinct capability in degrading srarch, but grow only aerobically. The other three bacterial strains, V25, V31, and V35, could grow both aerobicallyas well as anaerobically, in lO%(w/v) salt, at 50'C, and had good viabiliry and survival rate in soil. These characteristics of the bacterial Strains are very adquate in Korean food composting containing high concenrration of salt, especially at home. By mixing the 4 bacterial culrure broth with molasses, beet pulp, zeolite, The bacterial for food waste composting BIOTOP-CLEAN-was made. The perfolll ance of fool waste composting by the BIOTOP-CLEAN was compared with that by control(not treated) and HS(other domestic company’s inoculum produa for food waste composting). The maximum temperature of the food waste during the co,posting with the BIOTOP-CLEAN was 50C, while those of the control gave bad smell and HS gave less bad smell. These indicater that the food waste composting by the BIOTOP-CLEAN had been we;; accomplished.

풍력터빈용 18% 및 30% 두께 에어포일에 대한 동적실속 특성

이교열(Kyo-Yeol Lee),유기완(Ki-Wahn Ryu),강승희(Seung-Hee Kang) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4

청조 道光代의 해운논쟁

표교열(Pyo Kyo-Yeol) 한림대학교 아시아문화연구소 2002 아시아문화 Vol.- No.18

Spanwise Aerodynamic Loads along the Wind Turbine Blade

이교열(Lee, Kyo-Yeol),유기완(Ryu, Ki-Wahn) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05

The spanwise aerodynamic loads of the wind turbine blade are investigated numerically. The blade shape such as twist and chord length along the blade span is obtained from the procedure of aerodynamically optimal design. The rated tip speed ratio and the rated wind velocity are set to 7 and 12m/s respectively. The BEM method is applied to obtain both the aerodynamic performance of the wind turbine (Fig.1) and the spanwise aerodynamic loads along the blade span including Prandtl's tip loss factor. The maximum running power coefficient is occurred around 90% radial position from hub (Fig.2). The distributed aerodynamic loads along the blade span can be used for structure analysis.

西太后政權의 成立過程에 대하여

表敎烈(Pyo Kyo-yeol) 동양사학회 1985 東洋史學硏究 Vol.21 No.-

淸代 前期의 漕運 改革論

表敎烈(Pyo Kyo-Yeol) 동양사학회 1995 東洋史學硏究 Vol.50 No.-