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A study of thermolysis of irradiated diamide-containing extraction systems with nitric acid
I.V. Srvortsov,E.V. Belova,I.P. Sokolov,A.V. Rodin,S.V. Stefanovsky,B.F. Mysoedov 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.8
The dynamics of gas release at thermal oxidation of extraction systems on the basis of diamides ofdicarbonic acids in fluorinated sulphones with 14 mol/L HNO3 was investigated. The effect of preirradiationof the mixtures with accelerated electrons on the kinetics of their thermolysis was determined. The mixtures were heated in an autoclave at temperatures of 170 and 200 C and irradiated usingan electron accelerator to absorbed doses of 0.1, 0.5, and 1.0 MGy. It has been shown that no conditionsfor autocatalytic oxidation at thermolysis of extraction mixtures irradiated up to a dose of 1 MGy weredeveloped.
Maleic diamides as photostabilizers for polystyrene
Samira T. Rabie,M.A. Abd El-Ghaffar,Ahmed E. Ahmed,Magdy W. Sabaa 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
Some condensation maleic diamide adducts were prepared, characterized, and evaluated as photostabilizers for polystyrene. The potency of these diamides was determined by measuring the extent of weight loss (%), formed gel as well as the average molecular weights MV of the soluble fractions of the degraded polymers. The results indicated a good stabilizing effect of these products compared with the commercial UV absorber, phenyl salicylate. FTIR spectra of both neat and photoirradiated stabilized polystyrene gave an explanation of some photodegraded products of polystyrene. A probable radical mechanism is proposed to account for the stabilizing action of the diamide derivatives as photostabilizers.
E.V. Belova,I.V. Skvortsov,M.I. Kadyko,S.V. Yudintsev 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.4
Hydrodynamic properties have been investigated for promising extraction systems: 0.05 mol L-1 solutionsof di(N-ethyl-4-ethylanilide) of 2,20-bipyridine-6,60-dicarboxylic acid, di(N-ethyl-4-fluoroanilide) of2,6-pyridinedicarboxylic acid and di(N-ethyl-4-hexylanilide) of 2,20-bipyridine-6,60-dicarboxylic acid inmeta-nitrobenzotrifluoride (F-3) or trifluoromethylphenyl sulfone (FS-13) diluents. To evaluate theperspectives for their use as extraction mixtures at the final stage of the nuclear fuel cycle, the change indensity, viscosity, surface tension, and phase separation rate under irradiation with accelerated electronswas studied. The concentrations of extractants in the irradiated mixtures have been determined and theradiation-chemical yields have been calculated. Irradiation significantly decreases the phase separationrate at the stages of extraction and back extraction for all the studied systems. The viscosity of the DYP-7solution in FS-13 increase above the values suitable for its use in extraction processes.
열내성이 유도된 세포에서 HSP70 단백질 증가에 의한 단백질 변성 감소
한미영(Mi Young Han),박영미(Young-Mee Park) 대한약리학회 1996 대한약리학잡지 Vol.32 No.3
본 연구에서는 열충격에 의한 세포내 단백질 변성을 정량하는 방법을 소개하고 있다. Thiol compound인 diamide [azodicarboxylic acid bis (dimethylamide)]는 단백질변성시 노출된 sulfyhydryl기를 cross-link 시킨다. 정상 상태에서는 노출되지 않는 sulfyhydryl group이 변성된 단백질에서는 노출되기 때문에 diamide에 의한 cross-linking이 선택적으로 일어날 것이다. 그러므로 diamide는 변성된 단백질을 trap 하는 작용을 할 수 있다. 본 연구진은 세포내 열충격후 고분자 단백질 응집물 (high molecular weight protein aggregate, HAA)이 나타남을 비환원 (non reducing) SDS-PAGE에서 관찰하였고 이를 gas flow counter로 scanning하여 정량하였다. 실험 결과 세포에 열충격을 가한후 diamide를 처리하면 HMA가 열충격 용량의존적으로 증가함을 관찰하였다. 이는 HMA의 양을 측정함으로써 열충격에 의하여 변성된 단백질을 정량할 수 있음을 반증한다. 열내성이 유도된 세포와 그렇지 않은 세포를 비교하였을 때 열내성이 유도된 세포에서는 열충격에 의한 HMA의 형성이 억제됨을 관찰하였다. 열충격후 정상온도에서 회복기를 주면서 시간대별로 diamide를 첨가하고 이때 형성된 HMA양을 측정하여, 단백질 원형복구의 역동성을 실험하였다. 그 결과, HMA는 열내성의 유도 여부와 상관없이 빠르게 없어짐을 알 수 있었다. 그러나 열내성이 유도된 세포에서 HSP70 단항체를 electroporation에 의하여 투여하였을 때 HMA가 현저히 증가하였고, 이는 열내성이 유도된 세포에서는 HSP70의 증가에 의하여 HMA생성이 억제되었음을 나타낸다. HSP70 항체를 이용하여 면역침전을 시행한 결과 변성된 세포내 단백질이 HSP70과 같이 침전됨이 관찰되었다. 이 결과는 HSP70 단백질이 변성된 단백질과 일시적으로 결합하여 정상 상태로 돌아가거나 복구될 수 있도록 도와줄 수 있음을 시사한다. We describe a novel approach to evaluate quantitatively the amounts of denatured proteins in cells upon heat exposure. A thiol compound, diamide [azodicarboxylic acid bis (dimethylamide)] causes protein cross-linking with exposed sulfyhydryl residues of denatured proteins. Since denatured proteins expose normally well-hidden sulfhydryl groups, these will be preferentially cross-linked by diamide. Thus diamide acts to trap denatured proteins. We observed that protein aggregates (high molecular weight protein aggregates, HMA) appeared on SDS-polyacrylamide gels run under non-reducing conditions and that the amount of HMA can be quantified by scanning the gels using a gas flow counter. Heating cells followed by a fixed dose of diamide exposure resulted in HMA increases in a heat-dose dependent manner, demonstrating that the quantitation of HMA could serve as a measure of heat-denatured proteins. We compared thermotolerant and nontolerant cells and found decreased HMA in tolerant cells upon heat treatment. As an attempt to examine the kinetics of protein renaturation (or repair ), we measured the amounts of aggregates formed by the addition of diamide at various times after heat shock. Such experiments demonstrate an equally rapid disappearance of HMA in previously unheated and in thermotolerant cells. Levels of HMA in tolerant cells increased significantly after electroporation of HSP70 specific mAbs, suggesting an involvement of HSP70 in reducing HMA levels in thermotolerant cells upon heat exposure. Immunoprecipitation studies using anti-HSP70 antibody indicated an association of HSP70 with heat-denatured proteins. Our results suggest that heat induces protein denaturation, and that elevated level of HSP70 present in thermotolerant cells protects them by reducing the level of protein denaturation rather than by facilitating the repair (or degradation) process.
Diamide계 약제에 대한 파밤나방의 저항성 모니터링 및 방제체계
전종찬,박한찬,이종민,강열규,구현나,김길하 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11
국내 채집 파밤나방에 대해 diamide 약제감수성 평가와 점 돌연변이(G4946E, I4790M)을 분석하였다. 또한 가장 저항성이 높다고 판단된 2020년도 채집된 진도와 해남 집단을 대상으로 세대별 약제 감수성 평가와 점 돌연변이 변화를 확인하였다. 최종적으로 diamide 약제저항성 파밤나방을 방제하기 위한 IRM (Insecticide resistance management) program을 구성하여 방제가를 비교하였다. 그 결과, 국내에서 채집된 모든 집단은 chlorantraniliprole에 대해 200배 이상의 저항성비를 가졌으며, cyantraniliprole에 대해 2019년도 채집된 청주와 이천을 제외하고 200배 이상의 저항성비를 보였다. 모든 집단에서 점 돌연변이 G4946E는 확인할 수 없었으나, I4790M은 확인되었다. 가장 저항성이 높다고 판단된 2020년도 채집된 진도 및 해남 집단은 세대가 지남에 따라 두 약제에 대하여 지속적으로 감수성이 증가하였다. Diamide 약제저항성 개체들을 방제하기 위한 IRM 프로그램 평가를 진행한 결과, chlorfenapyr, fluxametamide, indoxacarb, spinetoram이 90% 이상의 살충률을 보였으며, 이를 바탕으로 4개의 프로그램을 구성하였고, 각 프로그램의 최종 방제가를 비교한 결과, 모두 91% 이상의 방제가를 나타냈다.
박한찬(Hanchan Park),조선란(Sun-Ran Cho),전종찬(Jong Chan Jeon),강원진(Won Jin Kang),김현경(Hyun Kyung Kim),구현나(Hyun-Na Koo),박부용(Bueyong Park),김길하(Gil-Hah Kim) 한국농약과학회 2021 농약과학회지 Vol.25 No.2
The beet armyworm, Spodoptera exigua (Hübner), is a important agricultural insect pest. IRM (Insecticide resistance management) programs and susceptibility by generations of S. exigua without exposure to any pesticides were examined in field-collected population (Haenam, Korea). In chlorantraniliprole treatment, the resistance ratio of F₁ generation showed more than 410,000 times, but the resistance ratio of F<SUB>6</SUB> generation was rapidly decreased by 271.1 times. Cyantraniliprole also decreased from 200,000 times (F₁ generation) to 105.7 times (F<SUB>6</SUB> generation). A point mutation I4790M in ryanodine receptor was observed in Haenam population. A susceptibility against F₄ generation using 11 registered pesticides was conducted in order to develop a IRM program. As a results, the five pesticides (broflanilide, chlorfenapyr, fluxametamide, indoxacarb and spinetoram) showed more than 90% mortality. Furthermore, all IRM programs showed more than 91% control effect, and there was no significant difference from program 5(excepting diamide-insecticides). These results can serve as a basis to control the diamide-resistant S. exigua in the field.