• 한국작물학회지
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• 제15권
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• pp.141-143
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• 1974

본답에서 재배되고 있는 방사선돌연변이계통들의 도열병 저항성 검정을 위하여 절리엽편접종법이 시도되었다. 즉 포장에서 절취한 잎을 항온항습실내에서 punch압상을 만들고 그 위에 도열병균의 포자현탁액을 접종한 후 형성된 병반의 크기를 측정하여 계통간의 저항성정도를 비교한 결과 방사선조사된 풍광으로부터 Upland short row method에 의하여 선발된 저항성계통들은 모품종 풍광에 비하여 저항성으로 나타났다. 따라서 이 방법은 포장에서 재배되는 성숙식물체의 도열병저항성 검정을 위한 하나의 선발방법으로서 효과적이라 생각되었다.

• Journal of Microbiology and Biotechnology
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• 제22권6호
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• pp.849-855
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• 2012

Plant growth-promoting rhizobacteria (PGPR) pseudomonads have a large number of lipopolysaccharides on the cell surface, which induces immune responses. Cd-resistant PGPR prevalent at the Cd-affected sites under biophytostabilization was monitored. Transmissiom electron microscopy was used to the study the behavior of tolerance of PGPR to cadmium level and its effect on pseudomonad strains (Z9, S2, KNP2, CRPF, and NBRI). An immunosensor was developed by immobilizing antibody (anti-Z9 or anti-S2) against selected PGPR on a piezoelectric quartz crystal microbalance (QCM). Immunosensors were found to supplement the inherent specificity of antigen-antibody reactions with the high sensitivity of a physical transducer. On comparison of the efficiency of detection with ELISA, the spectrophotometric technique, the developed immunosensor was found to be more sensitive, fast, and reliable even after regeneration for several times. Thus, the immunosensor may be used for future detection of PGPR strains after automation of the screening process.

• Journal of Plant Biotechnology
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• 제37권4호
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• pp.414-424
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• 2010

This report describes recent advances in tissue culture, genetic transformation of commercial rose (Rosa hybrida) and in development of new rose cultivars by molecular breeding. Rose is one of major cut-flowers in global horticulture industry. Successful progresses were made in development of new cultivars for pathogen resistant, environmental stress resistant and petal color modification by molecular breeding. New cultivars, however, has not reported yet in korea, although lots of progresses were achieved in each field of conventional breeding, tissue culture and genetic transformation. Cooperation in these research fields will promote screening of useful genes to have specific traits on rose and exploiting of processes to improve in the efficiency of tissue culture and genetic transformation of rose, therefore, we hopefully expect that new rose cultivars by molecular breeding will be released in the near future.

• 한국미생물·생명공학회지
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• 제50권4호
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• pp.584-591
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• 2022

Identifying carbapenem-resistant Enterobacteriaceae (CRE) is necessary to prevent nosocomial CRE infection outbreaks. Here, a rapid identification method with reduced enrichment time was developed without compromising accuracy. A total of 49 rectal swabs requested for CRE screening at the Department of Diagnostic Medicine at Hospital B in Busan, Korea, were included in this study. Specimens were inoculated on MacConkey and CHROMID Carba media either directly or following enrichment for 3, 6, and 24 h in 100 μl trypticase soy broth containing an ertapenem disk. The enriched cultures were further inoculated on CHROMID Carba or MacConkey media containing an ertapenem disk. In total, 19 CRE and 5 carbapenem-intermediate Enterobacteriaceae isolates were obtained from the 49 swabs. Among the 19 CRE isolates, carbapenemase-producing Enterobacteriaceae constituted 13 strains. Moreover, of the 19 CRE isolates, 16 (81.25%) and 17 (88.24%) were identified from the direct cultures on MacConkey and CHROMID Carba media, respectively. After 3 h of enrichment, the proportions of the CRE identified in the media were: MacConkey medium, 16/19 (81.25%); CHROMID Carba medium, 17/19 (88.24%); and MacConkey medium containing an ertapenem disk, 17/19 (88.24%). The detection rates after 6 h of enrichment were the same for all three media (19/19 strains, 100%), whereas those after 24 h of enrichment were 21, 22, and 24 strains, respectively, but included false positives. These findings suggest that a 6-h enrichment before inoculation on the CHROMID Carba medium is optimal for the rapid and accurate detection of CRE in clinical samples.

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
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• pp.103.2-104
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• 2003

Ginseng (Panax ginseng) is one of the most widely cultivated medicinal herbs in Korea. During 3 or 5 years cultivation of ginseng, yield losses can reach as high as 30-60％ due to numerous diseases in Korea. Among 106 Bacillus strains isolated from various plant internal roots, we selected three promising biocontrol agents by screening against root rot caused by Cylindrocarpon destructan in a greenhouse. Preinoculation of selected isolates to seed or one-year-old root resulted in stimulation of shoot and/or root growth of seedlings, and control of root rot in infested soils with Cylindronrpon destructans (P=0.05). Furthermore, drenching of selected isolates on seedling-growing pots reduced the incidence of Phytophthora blight when the seedlings were challenged with zoospores of Phytophthora cactorum (P=0.05). However, isolates B1141 and B1142 did not show any antifungal activity against various soilborne pathogens while B1146 did in vitro. Our results provide an insight that rhizobacteria can induce resistance against various plant diseases on ginseng even if any resistant breeds have been unknown on ginseng yet.

• 대한간호학회지
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• 제33권6호
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• pp.686-692
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• 2003

Purpose: To assess the effect of handwashing improving program and MRSA carrier detection program on MRSA(methicillin resistant Staphylococcus aureus) infection rate in a intensive care unit. Method: The intervention was Nosocomial Infection(NI) control program consisted of hand washing improving program and identification and treatment of MRSA carrier. Data on the NI and MRSA infections were collected by an infection control nurse based on the definition of CDC. MRSA infection rates were calculated by the number of MRSA infection per 100 admissions or 1,000 patients-days. The difference of MRSA infection rates between pre and post intervention was tested by Chi-square at =.05. Result: MRSA infection rates 3.0% or 3.2 per 1,000 patient-days at the pre, 4.6% or 3.7 per 1,000 patient-days at the post, and the differences were not statistically significant (p=.411, p=.769 respectively). Conclusion: The handwashing improving program and MRSA carrier detection program was not effective in reducing the Nosocomial Infection(NI) or MRSA infection rates. It is recommended further studies with a longer intervention and follow-up period.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2003년도 생물공학의 동향(XII)
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• pp.228-232
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• 2003

Lovastatin produced by Aspergillus terreus via polyketide pathway is a secondary metabolite with high anti-hypercholesterolemic activity. In this paper we are going to present effective strain development strategies for lovastatin production by comparing the productivity of the mutants obtained through traditional rational screening process and protoplast fusion method. Mutants resistant against various antibiotics and/or antimetabolites showed significantly higher lovastatin productivity than the corresponding mother strains, demonstrating that rational screening method was very efficient in selecting high yielding producers. Recombinant fusants obtained using protoplast fusion between high producers were observed to have very different morphology and physiology as represented by the production and secretion of lovastatin, as well as cell growth pattern. In parallel with the strain development, optimization process for the production medium was carried out in order to find optimal concentrations of the medium components using such a powerful statistical method as response surface method (RSM). It was concluded that not only the optimum production medium but also good morphological characteristics of the high-yielding producers led to higher lovastatin production.

• Journal of Microbiology and Biotechnology
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• 제16권3호
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• pp.465-468
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• 2006

Even though many pesticides are known for barley powdery mildew and wheat leaf rust, alternative controls are necessary, because of consumer rejection of chemical pesticides and the appearance of fungi resistant to fungicides. To discover biopesticides, many broths of microorganisms were screened. Of those, a culture broth of Burkholderia ambifaria showed an excellent antifungal activity against both Erysiphe graminis and Puccinia recondita, which cause barley powdery mildew and wheat leaf rust, respectively.

• 한국버섯학회지
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• 제9권4호
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• pp.170-179
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• 2011

품종 저항성 조사방법별로병원균과 버섯품종을 다르게 하여 품종간의 차이점이 있는지를 검토하였다. 푸른곰팡이 균과 품종별 대치배양시험에서 대치라인 형성, over growth, Lysis 증상이 나타났으며, 공시품종 중에 ASI 2183, ASI2504, ASI 2477 균주가 병저항성이 있을 것으로 판단되었다. 배양여액을 이용한 방법에서는 ASI 2240, ASI 2479, ASI 2181들이 저항성을 나타냈으며, 대치배양에서는 다른 경향을 보이는 경우도 있었으나, ASI 2479, ASI 2240 균주는 대치배양, 배양여액 시험결과에서 모두 저항성을 보였다. 배양후 접종법에서는 저항성을 보이는 버섯균주는 ASI 2479, ASI 2333, ASI 2181 등이었으며, 가장 감수성 품종은 큰느타리버섯인 ASI 2302 균주로 나타났다. 푸른곰팡이균주 같은 균주에서도 품종에 따라 각기 다른 특성을 나타냈으며, 동일품종에서 푸른곰팡이균주에 따라 각기 다른 병원성을 나타냈다. 느타리버섯과 푸른곰팡이균의 상호관계에서 다양한 증상이 발생하며 느타리버섯 품종에 대한 저항성 유무를 판단할 수 있다고 판단된다. 하지만 처리량이 많은 경우 동일 처리 내의 반복처리에서도 병징의 차이가 발생하는 경우가 있으며, 이는 시험에 사용한 버섯균과 병원균의 접종원의 활력의 차이에 의해 발생하는 것으로 추정되므로 주의해야하며, 저항성 균주로는 붉은느타리종, 감수성균으로 ASI 2302 균을 대조균으로 적용하면 효과적으로 저항성 검정을 수행할 수 있을 것으로 판단된다.

• 식물병연구
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• 제19권3호
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• pp.188-195
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• 2013

본 연구는 국내 수집 및 아시아채소개발센터 보유 품종인 오이 22종을 이용하여 노균병에 대한 품종별 저항성 정도를 구명하고 우수 품종을 선발하고자 대만 타이난소재 아시아 채소연구 개발 센터에서 수행하였다. 수집 품종에 대한 노균병 병원균 접종은 모든 수집 품종의 생장 단계 중 유엽이 5-6엽 전개되는 유묘 초기에 병원균을 접종하여 검정하였다. 이때 노균병 발병에 최적 발병조건 유지를 위해 온도 조절이 가능한 항온기 내에서 처리 후 일정기간 유지하였다. 노균병균의 접종농도는 $1{\times}10^5$ spores/ml의 포자 현탁액을 오이 잎에 1회 분무 접종 후 잎에 발생한 병반수를 6, 9, 12, 15일 총 4회에 걸쳐 조사하였다. 그 결과 $15^{\circ}C$와 $25^{\circ}C$ 챔버에서는 병반 형성이 매우 낮았으나 $20^{\circ}C$ 처리에서는 처리 품종당 평균 병반수 20-30개(5엽 기준)를 나타내어 병반 형성이 비교적 높았다. 처리 품종별 병반수는 'C-19' 품종에서 0.90(10-20% 미만)로 다른 품종에 비하여 비교적 병반수가 낮아 노균병에 대한 가장 높은 저항성을 나타내었다. 기타 품종에서는 병반수가 다량 형성되어 노균병에 대한 저항성이 낮았으며 처리 후 경과일수가 길어질수록 더욱 증가되어 유의적인 차이는 나타나지 않았다.