Magnetic Phase Transition and Variable Range Hopping Conduction of Y1-xSrxCoO3-\delta

A. I. Ali,Bog G. Kim,A. Hassen,김봉주,S. H. Park,Youngsoo Wu 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5

The structural, magnetic, and electric properties of perovskite Y$_{1-x}$Sr$_{x}$CoO$_{3-\delta}$ have been investigated systematically over the 0.6 $\leq$ $x$ $\leq$ 0.9 range of doping. The refinements of X-ray powder diffraction (XRD) patterns at room temperature indicates that the investigated samples show a unit cell of about 2 $\times$ 2 $\times$ 4 simple perovskite cubes with I4/mmm group symmetry. An antiferromagnetic (AFM) phase is observed for a Sr doping of 0.60 $\leq$ $x$ $<$ 0.775. With a further increase of Sr content, 0.775 $\leq$ $x$ $\leq$ 0.90, a mixture of AFM and ferromagnetic clusters may exist. No metallic behavior is observed for samples investigated in ambient conditions. The resistivity ($\rho$) data can be described using a three-dimensional variable range hopping (VRH) model. The density of states in the vicinity of the Fermi level for all compositions can be roughly estimated by fitting the temperature dependence of the resistivity.

Examination of Correlations Between Several Biochemical Components and Powdery Mildew Resistance of Flax Cultivars

Aly A. Aly,Kamel A. Abd-Elsalam,Mahmoud T. M. Mansour,Heba I. Mohamed 한국식물병리학회 2012 Plant Pathology Journal Vol.28 No.2

A field trial was conducted in 2009/2010 and 2010/2011growing seasons at Giza Agricultural Research Station to examine correlations between some biochemical componets and powdery mildews (PMs) resistance in flax cultivars. Nine flax cultivars could be divided into five distinct groups, i.e., highly susceptible (Cortland and C.I. 2008), moderately susceptible (Giza 7, and Marshall),moderately resistant (Cass), resistant (Koto, Dakota and Wilden), and highly resistant (Ottowa 770B). The cultivars showed considerable variation in PM severity ranged from 8.05 on Ottowa 770B to 97.02% on Cortland. Total soluble proteins, total phenols, antioxidant enzymes (peroxidase and polyphenoloxidase), ascorbic acid, tocopherol, and malondialdehyde (MDA), were determined in uninfected leaves of the tested cultivars. Pearson’s correlation coefficient was calculated to measure the degree of association between PM severity and each component. All components showed significant (P < 0.05) or highly significant (P < 0.01) negative correlation with PM severity except MDA, which showed positive correlation (P < 0.01). Linear regression analysis was used to evaluate the causal relationship between the biochemical components (independent variables)and PM severity (dependent variable). Coefficient of determination (R2) values of the generated models ranged from 48.76 to 77.15%. Tocopherol, MDA, and proteins were the most important contributors to the total variation in PM severity as the R2 values of their models were 71.78, 75.28, and 77.15%, respectively. The results of the present study suggest that tocopherol,MDA, and proteins in uninfected leaves can be used as biochemical markers to predict PM resistance in flax.

Examination of Correlations Between Several Biochemical Components and Powdery Mildew Resistance of Flax Cultivars

Aly, Aly A.,Mansour, Mahmoud T. M.,Mohamed, Heba I.,Abd-Elsalam, Kamel A. The Korean Society of Plant Pathology 2012 Plant Pathology Journal Vol.28 No.2

A field trial was conducted in 2009/2010 and 2010/2011 growing seasons at Giza Agricultural Research Station to examine correlations between some biochemical componets and powdery mildews ($PM_s$) resistance in flax cultivars. Nine flax cultivars could be divided into five distinct groups, i.e., highly susceptible (Cortland and C.I. 2008), moderately susceptible (Giza 7, and Marshall), moderately resistant (Cass), resistant (Koto, Dakota and Wilden), and highly resistant (Ottowa 770B). The cultivars showed considerable variation in PM severity ranged from 8.05 on Ottowa 770B to 97.02% on Cortland. Total soluble proteins, total phenols, antioxidant enzymes (peroxidase and polyphenoloxidase), ascorbic acid, tocopherol, and malondialdehyde (MDA), were determined in uninfected leaves of the tested cultivars. Pearson's correlation coefficient was calculated to measure the degree of association between PM severity and each component. All components showed significant (P < 0.05) or highly significant (P < 0.01) negative correlation with PM severity except MDA, which showed positive correlation (P < 0.01). Linear regression analysis was used to evaluate the causal relationship between the biochemical components (independent variables) and PM severity (dependent variable). Coefficient of determination ($R^2$) values of the generated models ranged from 48.76 to 77.15%. Tocopherol, MDA, and proteins were the most important contributors to the total variation in PM severity as the $R^2$ values of their models were 71.78, 75.28, and 77.15%, respectively. The results of the present study suggest that tocopherol, MDA, and proteins in uninfected leaves can be used as biochemical markers to predict PM resistance in flax.

PERFORMANCE OF LAMBS FED UREA MOLASSES BLOCKS vs CONCENTRATE

Mirza, I.H.,Jadoon, J.K.,Naqvi, M.A.,Ali, A. Asian Australasian Association of Animal Productio 1988 Animal Bioscience Vol.1 No.1

Thirty five crossbred male lambs of about 8 months age, with an average body weight of 24 kg were divided into 7 groups of 5 lambs each and were fed urea molasses blocks (UMB) for 150 days (groups 1 to 5); having, 4, 6, 8 and 10% urea respectively; while group 6 was fed concentrate @318 g per head daily and 7th group was kept as control i.e. grazing only. Daily consumption of UMB/concentrate was found to be 318, 246, 211, 93 and 318 g/d for groups 1 to 6, respectively. The statistical differences in consumption between group 1 and group 6, and group 2, 3 and 4 were found to be non-significant. Only group 5 differed statistically from all other groups. The average daily gain was 48, 29, 39, 38, 25 and 66 grams for groups 1 to 6 respectively, while group no. 7 lost 11 g/head/day. The differences in weight gain among groups 1, 3, 4 and 6 were non significant. The expenditure per kg body weight gain was found to be ($Rs^C$) 9.53, 12.45, 8.05, 7.99, 3.69 and 10.85 for groups 1 to 6, respectively.

New constituents triterpene ester and sugar derivatives from Panax ginseng Meyer and their evaluation of antioxidant activities

Chung, I.M.,Siddiqui, N.A.,Kim, S.H.,Nagella, P.,Khan, A.A.,Ali, M.,Ahmad, A. Saudi Pharmaceutical Society 2017 Saudi pharmaceutical journal Vol.25 No.5

Panax ginseng C. A. Meyer (Araliaceae), is a well-known herb and used in the old established system of Oriental remedy, especially in Japan, China and Korea. Four new compounds characterized as (cis)- 7β,11α,19,21-tetra-O-decanoyl-18, 22β-dihydroxy-dammar-1-en-3-one (1), 3β,4α,12β-trihydroxystigmast-5-en-21-yl octadecan-9',12'-dienoate (2), dammar-12, 24-dien-3α, 6β, 15α-triol-3α-D-arabinopyranosyl-6β-L-arabinopyranoside (3) and dammar-24-en-3α, 6β, 16α, 20β-tetraol-3α-D-arabinopyranosyl-6β-D-arabinopyranoside (4) were isolated and established from the ethyl acetate and butanol extracts of the roots of P. ginseng. Their structures were established on the basis of spectral data and chemical reactions. Natural compounds indicative a great reservoir of materials and compounds with evolved biological activity, including antioxidant. Compounds 1-4 were investigated in vitro for antioxidant potential using ferric reducing antioxidant power (FRAP), the Nitric oxide (NO) scavenging activity, reducing power, phosphomolybdenum and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging actions, and the decision showed the compounds 3and 4 have probablyessential antioxidant properties than the compounds 1and 2 presented weak activity.

Mosquitocidal and repellent activities of essential oils against Culex pipiens L.

Al‐Sarar Ali S.,Hussein Hamdy I.,Abobakr Yasser,Al‐Zabib Ali A.S.,Bazeyad Abdulqader Y. 한국곤충학회 2020 Entomological Research Vol.50 No.4

Plants are a prospective source of novel natural insect repellents and botanical insecticides. This study was conducted to investigate the chemical composition of the essential oils of three plants growing in Saudi Arabia, namely Ducrosia anethifolia, Achillea fragrantissima, and Teucrium polium; and to evaluate their potential mosquitocidal and repellent activities against adult female Culex pipiens L. The main components of the three oils were found to be decanal (28.9%) and chrysanthenyl acetate (10.04%), (D. anethifolia); sabinyl acetate (35.79) and artemesia ketone (18.28%) (A. fragrantissima); α-cadinol (49.53%) and δ-cadinene (10.23%) (T. polium). The oil of A. fragrantissima was the most toxic (LC50- = 0.11 μL/L air) followed by D. anethifolia and T. polium with LC50 values of 5.22 and 25.98 μL/L air, respectively. T. polium oil was the most repellent (292 min at 2 μL/cm2 ), followed by D. anethifolia and A. fragrantissima. The results indicate that the essential oils have a potential fumigant insecticidal and repellent activities for mosquito control.

Pomegranate (Punica granatum) Peel Extract Efficacy as a Dietary Antioxidant against Azoxymethane-Induced Colon Cancer in Rat

Waly, Mostafa I.,Ali, Amanat,Guizani, Nejib,Al-Rawahi, Amani S.,Farooq, Sardar A.,Rahman, Mohammad S. Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.8

Functional foods include antioxidant nutrients which may protect against many human chronic diseases by combating reactive oxygen species (ROS) generation. The purpose of the present study was to investigate the protective effect of pomegranate peel extract (PPE) on azoxymethane (AOM)-induced colon tumors in rats as an in vivo experimental model. Forty Sprague-Dawley rats (4 weeks old) were randomly divided into 4 groups containing 10 rats per group, and were treated with either AOM, PPE, or PPE plus AOM or injected with 0.9% physiological saline solution as a control. At 8 weeks of age, the rats in the AOM and PPE plus AOM groups were injected with 15 mg AOM/kg body weight, once a week for two weeks. After the last AOM injection, the rats were continuously fed ad-libitum their specific diets for another 6 weeks. At the end of the experiment (i.e. at the age of 4 months), all rats were killed and the colon tissues were examined microscopically for lesions suspected of being preneoplastic lesions or tumors as well as for biochemical measurement of oxidative stress indices. The results revealed a lower incidence of aberrant crypt foci in the PPE plus AOM administered group as compared to the AOM group. In addition, PPE blocked the AOM-induced impairment of biochemical indicators of oxidative stress in the examined colonic tissue homogenates. The results suggest that PPE can partially inhibit the development of colonic premalignant lesions in an AOM-induced colorectal carcinogenesis model, by abrogating oxidative stress and improving the redox status of colonic cells.

Audit Quality and Stock Price Synchronicity: Evidence from Emerging Stock Markets

ALMAHARMEH, Mohammad I.,SHEHADEH, Ali A.,ISKANDRANI, Majd,SALEH, Mohammad H. Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.3

This research examines the impact of audit quality on the extent to which firm-specific information is integrated with a firm's share price - which is determined inversely using stock price synchronicity. The study sample consists of non-financial companies listed on the Amman Stock Exchange i.e., the Jordanian Stock Market, from 2014-2018. After examining 810 firm-year observations from Jordanian industrial companies listed on the ASE, during the study period, we find that the companies using one of the BIG4 audit firms for auditing have less synchronous and more informative stock prices, suggesting high-quality audit improved governance and reduce information asymmetry between firms' insiders and investors which enhances the capitalization of firm's specific information into the stock price, thus less synchronous and more informative stock return. The findings remain consistent over 2 separate measurements of stock price synchronicity (Market and Industry model and Market Model) and show robustness for fixed effect tests. Our multivariate regression results are also robust after controlling for a number of features at the firm level with potential associations with stock price synchronicity. These include the firm size, leverage, return on assets (ROA), and market to book value (MBV).

Combined effects of sulfamethazine and sulfamethoxazole on a freshwater microalga, <i>Scenedesmus obliquus</i>: toxicity, biodegradation, and metabolic fate

Xiong, Jiu-Qiang,Kim, Sun-Joon,Kurade, Mayur B.,Govindwar, Sanjay,Abou-Shanab, Reda A.I.,Kim, Jung-Rae,Roh, Hyun-Seog,Khan, Moonis Ali,Jeon, Byong-Hun Elsevier 2019 Journal of hazardous materials Vol.370 No.-

<P><B>Abstract</B></P> <P>This study investigated the environmental effects of two common emerging contaminants, sulfamethazine (SMZ) and sulfamethoxazole (SMX), and their mixture using a green microalga, <I>Scenedesmus obliquus</I>. The calculated EC<SUB>50</SUB> values of SMZ, SMX, and their mixture (11:1 wt/wt) after 96 h were 1.23, 0.12, and 0.89 mg L<SUP>-1</SUP>, respectively. The toxicity of the mixture could be better predicted using a concentration addition model than an independent action model. The risk quotients of SMZ, SMX, and their mixture were >1 during the experiment, indicating their high potential risks on aquatic microorganisms. Despite their toxicity, <I>S. obliquus</I> exhibited 17.3% and 29.3% removal of 0.1 mg L<SUP>-1</SUP> and 0.2 mg L<SUP>-1</SUP> after 11 days of cultivation. The changes of SMZ and SMX removal were observed when combined, which showed a significantly improved removal of SMZ (up to 3.4 folds) with addition of SMX (0.2 mg L<SUP>-1</SUP>). The metabolic pathways of SMZ and SMX were proposed according to mass spectroscopic analysis, which showed six metabolites of SMX and seven intermediates of SMZ, formed as a result of ring cleavage, hydroxylation, methylation, nitrosation, and deamination.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>Scenedesmus obliquus</I> was tolerant to SMZ, SMX, and their mixture, and could withstand their high doses. </LI> <LI> 96 h EC<SUB>50</SUB> of SMZ, SMX, and their mixture for <I>S. obliquus</I> was 1.23, 0.12, and 0.89 mg L<SUP>-1</SUP>. </LI> <LI> The risk quotients of SMZ, SMX, and their mixture were >1. </LI> <LI> The removal of SMZ and SMX was more in the mixture than their individual medium. </LI> <LI> Metabolic pathways of SMZ and SMX by <I>S. obliquus</I> were proposed. </LI> </UL> </P>

Pathogenicity of Bacillus Strains to Cotton Seedlings and Their Effects on Some Biochemical Components of the Infected Seedlings

Aly A. Aly,Omima M. El-Mahdy,Marian M. Habeb,Abeer Elhakem,Amal A. Asran,Maryan M. Youssef,Heba I. Mohamed,Rania S. Hanafy 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.2

Pathogenicity of eight Bacillus strains to seedlings of four cotton cultivars was evaluated under greenhouse conditions. Each of the tested cultivars was individually treated with powdered inoculum of each bacterial strain. Untreated seeds were planted as control treatments in autoclaved soil. Effects of the tested strains on levels and activities of some biochemical components of the infected seedlings were also assayed. The biochemical components included total soluble sugars, total soluble proteins, total free amino acids, peroxidase, polyphenol oxidase, phenols, and lipid peroxidation. ANOVA showed that Bacillus strain (B) was a very highly significant source of variation in damping-off and dry weight. Cotton cultivar (V) was a nonsignificant source of variation in damping-off while it was a significant source of variation in dry weight. B × V interaction was a significant source of variation in damping- off and a nonsignificant source of variation in dry weight. Bacillus strain was the most important source of variation as it accounted for 59.36 and 64.99% of the explained (model) variation in damping-off and dry weight, respectively. The lack of significant correlation between levels and activities of the assayed biochemical components and incidence of damping-off clearly demonstrated that these biochemical components were not involved in the pathogenicity of the tested strains. Therefore, it was hypothesized that the pathogenicity of the tested strains could be due to the effect of cell wall degrading enzymes of pathogenic toxins. Based on the results of the present study, Bacillus strains should be considered in studying the etiology of cotton seedling damping-off.