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Internal Control을 이용한 애멸구에서 벼 줄무늬잎마름병의 검출을 위한 RT-PCR 진단
노태환 ( Tae Hwan Noh ),강미형 ( Mi Hyung Kang ),김정수 ( Jeong Soo Kim ),심형권 ( Hyeong Kweon Shim ),백채훈 ( Chae Hoon Paik ),최만영 ( Man Yeoung Choi ),김형무 ( Hyung Moo Kim ),이건휘 ( Geon Hwi Lee ) 전북대학교 농업과학기술연구소 2012 농업생명과학연구 Vol.43 No.2
Rice stripe virus (RSV) is a serious disease of rice, in Korea and other Asia countries. RSV is transmitted only by the small brown planthopper (SBPH), Laodelphax striatellus in a propagative manner. Therefore a detection of RSV in the SBPH is a need for disease forecasting. A one step duplex RT-PCR was developed to amplify 549 bp of RSV RNA3 and 201 bp fragment of SBPH ITS region as internal control. Especially, The primer pairs from SBPH ITS region were used as specific positive control for each stage of the experiment to ensure the validity of the negative for the detection of RSV in SBPH. This duplex primer kits were able to detect 0.2 ng of total RNA from SBPH and rice. Based on this protocols, each PCR based methods for RSV virulifeorus rate in SBPH were represented more accurate results.
연구논문 : 자연과학; 정량 PCR을 이용한 벼 흰잎마름병균 밀도 측정
노태환 ( Tae Hwan Noh ),강미형 ( Mi Hyung Kang ),서수좌 ( Su Joa Seo ),심형권 ( Hyeong Kwon Shim ),최만영 ( Man Young Choi ),박종철 ( Jong Chul Park ),백채훈 ( Chae Hoon Paik ),김형무 ( Hyung Moo Kim ) 한국국제농업개발학회 2013 韓國國際農業開發學會誌 Vol.25 No.2
Real Time PCR을 이용한 벼 흰잎마름병균의 밀도를 측정할 수 있는 새로운 방법을 개발하였다. Real Time PCR을 이용하여 벼 흰잎마름병을 예찰하기 위하여 TaqMan MGB probe를 이용한 프라이머인 Xan_PahgeF & Xan_PahgeR primer와 Xan_Pahge FAM MGB probe를 제작하였으며, 높은 특이성이 인정되었다. 병원균 배양액, 벼 흰잎마름병원균의 DNA, 병원세균에 오염된 물에서도 효과적으로 검출이 되었다. 농수로물이나 관개수에서 벼 흰잎마름병균의 밀도를 측정할 때 정량 PCR의 저해인자 제거 후 신속하게 벼 흰잎마름병균의 밀도를 측정할 수 있다. We developed a new measurement method for the density of Xanthomonas oryzae pv. oryzae(Xoo), a casual pathogen of bacterial leaf blight of rice. The new method used real time PCR with the highly characterized and specific Xan_PahgeF & Xan_PahgeR primer and Xan_Pahge FAM MGB probe primer pairs derived from phage-related integrase gene. The method was effective when tested with a variety of templates including isolated Xoo DNA, pure colonies or liquid culture sources, and could also work on contaminating water. A main advantage of this assay is to accurately and rapidly quantitate the population density of Xoo in paddy field water containing inhibitors.
노태환 ( Tae Hwan Noh ),강미형 ( Mi Hyung Kang ),심형권 ( Hyeong Kwon Shim ),백채훈 ( Chae Hoon Paik ),최만영 ( Man Young Choi ),김형무 ( Hyung Moo Kim ) 전북대학교 농업과학기술연구소 2012 농업생명과학연구 Vol.43 No.2
We developed bacteria pure isolation method for Bacterial grain rot of rice caused by Burkholderia gumae from diseased rice seeds. In the result by these methods, the bacteria were distributed as 11 isolates (55%) in brown rice, 9 isolates (45%) inner hull and 2 isolates (10%) outer hull among 20 isolated collections, respectively, however 65% of saprophytic bacteria were isolated form outer hull. This result suggested that most of the pathogen exist in brown rice and inner hull. In PCR identification with the B. glumae specific primer, Ogf4 and Ogr3, it was confirmed that all 54 expected isolates were identified as the pathogen, however, for 21 other bacteria were the amplification by the PCR were failed. In conclusion, using diseased seeds and KB medium the rapid and simple identification to the bacterial grain rot pathogen B. glumae.
노태환(Tae-Hwan Noh) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.5
Fabrication condition and magnetic properties of ultrathin Co-based amorphous alloy have been investigated. When the ejection gas pressure was lower than 0.05 ㎏f/㎠ at the roll speed of 55 m/s, ultrathin ribbons with the thickness less than 10 ㎛ were successfully obtained. The ribbon thickness decreased linearly with the decrease in ejection pressure. Moreover the significant decrease in ribbon width was accompanied with the decrease of thickness in the range of ejection pressure to form an ultrathin ribbon. This behavior was attributed to the decrease of effective ejection pressure in the both end-sides of rectangular nozzle due to the larger friction between molten metal and nozzle wall. The effective permeability at low frequency (1 ㎑) decreased largely with the decrease in ribbon thickness, while the coercive force increased with the thickness decrease. It was considered that these behaviors were due to the enhancement of surface effect leading to the suppression of wall motion. However effective permeability at high frequency (1 ㎒) increased with the decrease in ribbon thickness, and this was ascribed to the easier magnetization rotation owing to the reduction of eddy current.
FeSiCr/폴리머 복합 시트의 전자파 흡수 특성에 미치는 시트 두께의 영향
노태환(Tae-Hwan Noh),김주범(Ju-Beom Kim) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.4
This study examined the effects of sheet thickness on electromagnetic wave absorption characteristics and internal microstructure in 92.6 %Fe-6.5 %Si-0.9 %Cr (wt%) alloy flakes/polymer composite sheets available for quasi-microwave band. The composite sheets with the thickness of 0.3, 0.4 and 0.5 ㎜ were prepared by tape casting. A significant decrease in transmission parameter S<SUB>21</SUB> and a large increase in power loss were observed for the thick composite sheet in the frequency range of 1~5 ㎓. However the permeability properties were not affected by thickness variation, while the imaginary part of complex permittivity increased with the increase of sheet thickness at 1~5 ㎓. The enhanced electromagnetic wave absorption characteristics in the thicker composite sheets was attributed to the changed microstructure and the higher dielectric loss.
고 비정질 형성능을 가진 FeBSiNb 합금 리본의 자기적 특성
노태환(Tae-Hwan Noh),김구현(Gu-Hyun Kim) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.4
Amorphous FeBSiNb alloy ribbons having bulk glass forming ability and high saturation magnetic flux density were produced by single-roller melt spinning apparatus in the thickness range of 22~102㎛. With the increase of thickness, the coercive force and squareness ratio decreased, while maximum permeability and AC permeability increased. However electrical resistivity was almost constant. Furthermore refined and complex magnetic domain structure was observed in thicker ribbons owing to the change in internal magnetic anisotropy. For the alloy with the thickness of 81㎛, small coercive force of 24 mOe and high effective permeability of 12,000 at 1 ㎑ were obtained, those are considered to be better comparing to the conventional soft magnetic amorphous alloys (~20㎛). The good soft magnetic properties of the thick FeBSiNb amorphous alloys were attributed to the decrease in surface pinning effect during wall motion, appearance of perpendicular anisotropy and resulted domain refinement.
FeCuNbSiB 합금 박편/폴리머 복합 시트의 전자파 흡수 특성에 미치는 자성분말 어닐링 온도의 영향
노태환(Tae-Hwan Noh),이태규(Tae-Gyu Lee) 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.5
The effects of annealing temperature on electromagnetic wave absorption characteristics in Fe<SUB>73.5</SUB>Cu₁Nb₃Si<SUB>15.5</SUB>B? (at%) alloy flakes/polymer composite sheets available for quasi-microwave band have been investigated. The composite sheet including the magnetic flakes annealed at 425~475 ℃ for 1 h exhibited highest power loss in the ㎓ frequency range as compared with the sheets composed of the alloy flakes annealed at higher temperature than 475 ℃ or in as-milled state. Moreover the imaginary part of complex permeability had largest value in the ㎓ frequency range for the sheets including the flakes annealed at 425~475 ℃. The large value of power loss of the sheets including the magnetic flakes annealed at 425~475 ℃ was attributed to the high imaginary part of the complex permeability. However, because of its large transmission parameter S₂₁, the composite sheet having the magnetic flakes annealed at 525 ℃ showed low power loss.