• 아시안잔디학회지
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• 제26권1호
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• pp.17-23
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• 2012

Rhizoctonia solani AG2-2(IV)에 의한 갈색퍼짐병은 들잔디에서 가장 심각한 병이다. 이 연구의 목적은 파라핀 오일을 이용하여 갈색퍼짐병에 대한 실내에서 살균효과와 포장에서 병 방제 효과를 평가하는 것이다. 포장시험인 골프장에서 파라핀 오일은 200배와 50배액을 1 $m^2$당 1 L을 살포하였다. 실내시험에서는 균사생육억제효과시험을 위해서는 0.25%에서 2%까지 파라핀농도에서 시험하였다. 파라핀 오일의 0.5%의 농도와 2%의 농도에서 각각 43%와 67%의 균사생장 억제효과가 있었다. 두 지역의 포장시험에서 파라핀 오일의 9월에 1회 살포로서 갈색퍼짐병의 발달을 48%까지 억제하였다. 파라핀오일은 친환경적으로 들잔디에 갈색퍼짐병을 방제하는 대체물질로 사용할 수 있을것이다.

• 한국식품과학회지
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• 제9권4호
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• pp.306-312
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• 1977

탄화수소 자화성균인 C. tropicalis와 비(非)자화성인 T. cutaneum의 혼합배양에 있어서 두 효모간의 상호작용을 구명하였다. 즉 본균(本菌)인 C. tropicalis는 n-paraffin을 자화하여 증식하면서 유리지방산을 대사산물로 배양액에 축적하는 동시에 자신이 이 지방산에 의해 생육저해를 받는다. 공생균(共生菌)인 T. cutaneum은 본균(本菌)의 대사산물인 유리지방산을 탄소원으로 생육하므로써 생육저해작용을 해소하여 본균(本菌)의 증식 속도와 균체수율을 향상시키는 commensalistic system을 형성하는 것으로 판단되었다.

• 대한의생명과학회지
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• 제8권3호
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• pp.161-165
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• 2002

Apoptosis can be difficult to detect in routine histological sections. Since extensive DNA fragmentation is an important characteristic of this process, visualization of DNA breaks could greatly facilitate the identification of apoptotic cells. Several techniques for the qualitative and quantitative detection of this process have been established; recently, an in situ nick end-labelling technique based on the detection of DNA fragmentation, which is a molecular characteristic of apoptotic cell death, was described. Applying this method to paraffin sections of rat tissues, sensitivity was observed to be inconsistently low with regard to the expected number of apoptotic cells. I describe a new modified method for formalin-fixed, paraffin-embedded tissue sections, pretense pretreatment to permeate the tissue sections that involves an TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling) is acknowledged as a method of choice in the rapid identification and quantification of the apoptotic cell fraction in paraffin tissue preparations. TUNEL was performed without apoptosis and with apopotosis samples to each of the three concentrations of proteinase K (10, 25, 40 mg/ml) pretreatments. In this study, I show that chemical pretreatments of the tissue sections in proteinase K (25 mg/ml for 15 min at room temperature) considerably enhances the sensitivity of this nick end labelling technique.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2009년도 제33회 추계학술대회논문집
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• pp.499-502
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• 2009

고농도 과산화수소를 산화제로 이용하는 하이브리드 로켓의 자연 점화 연구를 수행하였다. 별도의 점화기 없이 촉매 반응을 통한 과산화수소 분해가스를 파라핀 및 폴리에틸렌에 분사함으로서 점화를 하였고 연속적인 재점화 및 즉각적인 점화 특성을 확인하였다. 안정적인 연소를 위해 파라핀은 PE에 비해 높은 연소실 특성길이가 요구된 반면, 펄스 응답특성은 점화지연 13 ms, 상승시간 30 ms 로서 폴리에틸렌의 응답성에 비해 두 배 가량 빠른 특성을 보였다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제34회 춘계학술대회논문집
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• pp.206-209
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• 2010

하이브리드 로켓에서의 고체 연료의 연소 현상을 가시화하기 위하여 장치를 제작하였다. 가시화 장치는 평판 하이브리드 연소기 시스템, 점화 시스템, 산화제 공급 시스템, 데이터 획득 및 제어 시스템, 연소 가시화 측정 장비로 구성되었다. GOX 산화제와 HDPE, Paraffin-LDPE Blending, Paraffin 연료를 이용하여 연소 가시화 시험을 수행하였고, 수치적으로만 연구되어 왔던 연소실 내의 연소 현상을 가시화 할 수 있었으며, 화염의 형성 및 용융성 연료의 액적 비산 현상을 관찰 할 수 있었다.

• 한국자동차공학회논문집
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• 제21권2호
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• pp.37-44
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• 2013

Generally, a reduced chemical mechanism of n-heptane is used as chemical fuel of a 3-D diesel engine simulation because diesel fuel consists of hundreds of chemical components and various chemical classes so that it is very complex and large to use for the calculation. However, the importance of fuel in a 3-D simulation increases because detailed fuel characteristics are the key factor in the recent engine research such as homogeneous charged compression ignition engine. In this study, normal paraffin, iso paraffin and aromatics were selected to represent diesel characteristics and n-dodecane was used as a representative normal paraffin to describe the heavy molecular weight of diesel oil (C10~C20). Reduced kinetics of iso-octane and toluene which are representative species of iso paraffin and aromatics respectively were developed in the previous study. Some species were selected based on the sensitivity analysis and a mechanism was developed based on the general oxidation scheme. The ignition delay times, maximum pressure and temperature of the new reduced n-dodecane chemical mechanisms were well matched to the detailed mechanism data.

• 대한임상검사과학회지
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• 제46권2호
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• pp.47-53
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• 2014

The purpose of this study was to evaluate the clinical utility of TB/NTM PCR by comparing the results of TB PCR to detect Mycobacterium tuberculous (MTB) and nontuberculous mycobacteria (NTM) from paraffin-embedded tissue specimens. A total of 60 cases were tested using TB PCR and TB/NTM PCR. The MTB and NTM rate of TB/NTM PCR was 84.2% (16/19), 10.5% (2/19) in TB positive of TB PCR. The NTM rate of TB/NTM PCR was 29.3% (12/41) in TB negative of TB PCR. Fourteen different species of NTM were identified, the common isolate was M. gordonae (21.4%), M. avium (14.3%), M. ulcerans (7.1%), M. interjectum (7.1%), M. gilvum (7.1%), M. fortuitum (7.1%), M. mucogenicum (7.1%). The rare species identified were M. farcinogenes (7.1%), M. tokaiense (7.1%). Therefore, TB/NTM PCR is useful to differentiate MTB and NTM from paraffin-embedded tissue specimens and it is more effective in detecting NTM with TB PCR.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년도 제31회 추계학술대회논문집
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• pp.261-264
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• 2008

고체 연료로 파라핀을 사용하고 산소를 산화제로 사용하는 하이브리드 로켓의 연소 특성에 대해 실험 연구를 진행하였다. 특히 연소실 내부의 압력과 연료 그레인의 형태에 따른 영향을 살펴보았다. 연소 시 산화제의 유입량을 변화시키며 연소실 내부의 압력을 측정하였다. 관찰된 압력변화 범위 내에서 연소실 내부의 압력이 증가할 때 후퇴율도 증가함을 보여주었다. 또한 연료 그레인 형태의 변화에 따라 후퇴율이나 추력 등은 어느 정도 경향성을 보인다. 산화제 유입 부분에 공간을 마련하면 추력이 증가하나 노즐 가까운 곳에 형성한 공간은 추력 상승에 큰 도움이 되지 않는다.

• 한국태양에너지학회 논문집
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• 제39권5호
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• pp.65-78
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• 2019

In this study, we investigated the paraffin encapsulation using double-walled encapsulation technique. The first encapsulation used methyl methacrylic acid as the main component in acrylic polymer and the second encapsulation used melamine polymer. Particles size and distribution of the capsules were analyzed using scanning electron microscopy. In the first encapsulation, the stable capsules were obtained at 67% of phase change material ratio to methyl methacrylic acid monomer and the size of the capsule was from 0.2 to $0.3{\mu}m$. In the second encapsulation, the size of the capsules was almost the same with those capsules prepared in the first encapsulation. The particle size of single wall and double wall was about $0.3{\mu}m$. As a result of the encapsulation of paraffin using double-walled encapsulation technique, it was confirmed that the particle size was determined in the process of encapsulating using the acrylic polymer at the first wall material, and the physical and thermal stability of the capsules were imparted using melamine at the secondary wall material.

• 대한수의학회지
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• 제41권3호
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• pp.381-385
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• 2001

Neospora caninum infections have been associated with neonatal paresis as well as abortion around the world. Bovine abortion induced by N caninum was first reported in 1997 in Korea. Diagnosis of N caninum infection is usually based on histopathology and immunohistochemical detection of organism. However, often the tissues having lesion suggestive of N caninum infection were negative on immunohistochemistry. Here, we describe establishment of PCR-based diagnostic strategy for N caninum infection using DNA extracted from paraffin blocks containing the lesion. PCR was able to amplify N caninum-specific bands from the paraffin blocks containing at least moderate degree of inflammation. Compared to paraffin-blocks, DNA extracted from fresh tissues were less sensitive than that of paraffin blocks. This PCR-based method can be practically applicable for rapid diagnosis of bovine N caninum infection with high specificity and sensitivity. Based on this method, 17% of bovine abortion surveyed during a designated period was associated with N caninum infection.