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RISS 인기검색어
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- 저자 : El-Defrawy, Ahmed M. (검색결과 3 건)
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Gene Action and Combining Ability of Cellular Thermotolerance in Bread Wheat (Triticum aestivum L.)
( Mahmoud A. El-rawy ),( Mohamed I. Hassan ),( Mohamed F. Omran ),( Mohamed M. El-defrawy ) 한국육종학회 2018 Plant Breeding and Biotechnology Vol.6 No.3
Heat stress is one of the most important factors limiting growth and productivity of wheat. In the present study, gene action, general (GCA) and specific (SCA) combining ability of cellular thermotolerance were studied in a nine-parent half diallel cross of bread wheat evaluated under normal (1 <sup>st</sup> sowing date) and heat stress (late sowing date) conditions. The cellular thermotolerance was estimated based on cell membrane thermostability (CMS) and tetrazolium chloride (TTC) reduction. Grain yield/plant (GYP), 1000-kernel weight (TKW), stem diameter (STD) and heat tolerance index (HTI) were measured. Compared with their parents, F1 hybrids significantly produced higher GYP, CMS, TTC and HTI. Highly significant mean squares of GCA and SCA effects were observed for all traits with GCA mean squares being much larger than that of SCA. Highly significant additive (a) and non-additive (b) gene actions were observed for all the traits with a predominance of the additive gene actions. However, the dominance genetic variance of CMS and TTC was greater than the additive variance. Moderate to high narrow-sense heritability was obtained for CMS (0.52), TTC (0.57) and HTI (0.71). GYP was significantly correlated with CMS (r = 0.62), TTC (r = 0.63) and HTI (r = 0.60). A highly significant positive correlation was obtained between CMS and TTC (r = 0.73), supporting that CMS and TTC could be used as efficient criteria for selecting wheat genotypes under heat stress. The parents P<sub>9</sub>, P<sub>1</sub> and P<sub>2</sub> were identified as best general combiners for CMS, TTC and HTI respectively. Six crosses were identified as best promising combinations for CMS (P<sub>1</sub> × P<sub>8</sub> and P<sub>5</sub> × P<sub>9</sub>), TTC (P<sub>4</sub> × P<sub>9</sub> and P<sub>5</sub> × P<sub>6</sub>) and HTI (P<sub>1</sub> × P<sub>2</sub> and P<sub>8</sub> × P<sub>9</sub>). Thus, inclusion these superior genotypes into breeding programs could be useful for improvement of heat tolerance in wheat.
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Ouf, Abd El-Fatah M.,Ali, Mayada S.,Soliman, Mamdouh S.,El-Defrawy, Ahmed M.,Mostafa, Sahar I. Korean Chemical Society 2010 대한화학회지 Vol.54 No.4
New complexes cis-[$Mo_2O_5(Hapdhba)_2$], trans-[$UO_2(Hapdhba)_2$], [Pd(Hapdhba)Cl($H_2O$)], [Pd(bpy)(Hapdhba)]Cl, [Ag(bpy)(Hapdhba)], [$Ru(Hapdhba)_2(H_2O)_2$], [$Rh(Hapdhba)_2Cl(H_2O)$] and [Au(Hapdhba)$Cl_2$] are reported, where $H_2$apdhba is the Schiff-base derived from 2-aminopyrimidine and 2,4-dihydroxy benzaldehyde. The complexes were characterized by IR, electronic, $^1H$ NMR and mass spectra, conductivity, magnetic and thermal measurements. The inhibitive effect of $H_2$apdhba for the corrosion of copper in 0.5 M HCl was also determined by potentiodynamic polarization measurements. 새로운 착물인 cis-[$Mo_2O_3(Hapdhba)_2$], trans-[$UO_2(Hapdhba)_2$], [Pd(Hapdhba)Cl($H_2O$)], [Pd(bpy)(Hapdhba)]Cl, [Ag(bpy) (Hapdhba)], [$Ru(Hapdhba)_2(H_2O)_2$], [$Rh(Hapdhba)_2Cl(H_2O)$] 및 [Au(Hapdhba)$Cl_2$]를 보고한다. 여기서 $H_2$apdhba는 2-aminopyrimidine 및 2,4-dihydoxybenzaldehyde에서 비롯된 Schiff-염기이다. 이들 착물은 IR, UV-Vis 그리고 질량 스펙트럼을 비롯하여 전기전도도, 자기 및 열 분석을 통해 특성을 조사하였다. 구리의 부식에 대한 $H_2$apdhba의 방해효과는 0.5 M HCl에서 potiodynamic polarization 측정을 통해 조사하였다.
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Fouda, A.S.,El-Defrawy, A.M.,El-Sherbeni, M.W. The Korean Electrochemical Society 2013 Journal of electrochemical science and technology Vol.4 No.2
Inhibition performance of Lornoxicam & Tenoxicam against corrosion of carbon steel in 1M $H_2SO_4$ solutions was investigated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. The inhibition efficiency increased with increasing inhibitor's concentration, but decreased with increase in temperature. Potentiodynamic polarization curves showed that, the inhibitors were of mixed type. The apparent activation energy ($E^*_a$) and other thermodynamic parameters for the corrosion process have also been calculated and discussed. The inhibition of carbon steel corrosion is due to the adsorption of the inhibitor molecules on the surface, which follows Temkin adsorption isotherm. The mechanism of inhibition was discussed in the light of the chemical structure of the undertaken inhibitors.
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