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Saad, G. R., E. A. E. Elhamid, and S. A. Elmenyawy, "Dynamic Cure Kinetics and Thermal Degradation of Brominated Epoxy Resin", Thermochimica Acta, vol. 524, issue 1-2, pp. 186–193, 2011. AbstractCU-PDF.pdf

The reaction kinetics of epoxy resin cured with stoichiometric amounts of amine-like structure and loaded with different levels of Cloisite 25A (C25A), has been studied by dynamic differential scanning calorimetry (DSC) to investigate the effect of the nano-organoclay particles on the kinetic parameters of the cure reaction.

Shoukry, A. A., and M. S. Mohamed, "DNA-Binding, Spectroscopic and Antimicrobial Studies of Palladium (II) Complexes Containing 2,20-Bipyridine and 1-Phenylpiperazine", SpectrochimicaActa Part A: Molecular and Biomolecular Spectroscopy, 2012.
Kandil, M. M., G. W. A. El-Said, A. N. S. H. Galal, S. A. Marouf, J. El-Jakee, and A. Elgabry, "Diversity of Escherichia Coli Outer Membrane Protein", World Applied Sciences Journal, vol. 15, issue 9, pp. 1211-1219, 2011. CU-PDF.pdf
Afify, A. E. - M. M. R., H. S. El-Beltagi, A. A. E. - A. Hammama, M. M. Sidky, and O. F. A. Mostafa, "Distribution of Trans-Anethole and Estragole in Fennel (Foeniculum Vulgare Mill) of Callus Induced from Different Seedling Parts and Fruits", Not Sci Biol, 2011. Abstract

In the present study, seeds from local cultivar of fennel were germinated on Murashige and Skoog medium (MS) without plant growth regulators. Different types of explants from the growing seedling such as cotyledonal leaves, hypocotyls, epicotyls and roots were cultured on MS medium, contained different concentrations of 2,4-dichlorophenoxyacetic acid (2,4-D) either alone or with kinetin. Differential responses in the essential oil constituents were observed in the induction and development of callus. The major components of essential oils includes estragole, trans-anethole, limonene and fenchone were studied under different conditions to find out the best methods which could be used to reduce the amount of estragole (not favorite for human consumption) and increase the amount of trans-anethole.

Kashouty, M. E., and A. E. Sabbagh, "Distribution and Immobilization of Heavy Metals in Plioceneaquifer Sediments in Wadi El Natrun Depression, Western Desert", Arab J Geosci, 2011. Abstract

The Pliocene aquifer receives inflow of Miocene and Pleistocene aquifers waters in Wadi El Natrun depression.

Omran, N. H., R. E. M. Nashar, and H. Y. Aboul-Enien, "Dissolution Testing and Potentiometric Assay of Sertraline Hydrochloride in Batch and FIA Conditions", Analytical Letters, 2011.
Goudah, A., and S. Hasabelnaby, "The Disposition of Marbofloxacin after Single Dose Intravenous, Intramuscular and Oral Administration to Muscovy Ducks", Journal of Veterinary Pharmacology and Therapeutics, vol. 34, pp. 197-201, 2011. CU-PDF.pdf
Hegazi, E., W. Khafagi, A. Herz, M. Konstantopoulou, S. Hassan, E. Agamy, A. and Atwa, and S. Shweil, "Dispersal and field progeny production of Trichogramma species released in an olive orchard in Egypt", Bio Control, 2011. AbstractCU-PDF.pdf

Dispersal ability and field progeny production of augmentative released biological control agents depend on ecological adaptations of the particular species or strains used. Four species of the egg parasitoid genus Trichogramma were compared aiming to select suitable candidates for control of lepidopteran olive pests.

Afify, A. E. - M. M. R., and H. S. El-Beltagi, "Discharge of Lead Contamination By Natural Compounds Pectin And Chitin: Biochemical Analysis Of DNA, RNA, Dnase, Rnase And GOT In Albino Rat As An Early Bio-Marker of Lead-Toxicity", Asian Pacific Journal of Tropical Biomedicine, vol. 1, issue 2, pp. 226–231, 2011. AbstractCU-PDF.pdf

To study the effect of different concentration of lead in drinking water on nucleic acid contents, nuclease activities and GOT in different tissues. It was attempts to reduce toxic effects of lead on survive of the environment especially human and rats by using pectin and chitin natural compounds in rat diets.

Atta, N. F., A. Galal, and R. A. Ahmed, "Direct and Simple Electrochemical Determination of Morphine atPEDOT Modified Pt Electrode", Electroanalysis, 2011.
El-Beltagi, H. S., A. A. Mohamed, and B. E. - D. B. Mekki, "Differences in some constituents, enzymes activity and electrophoretic characterization of different rapeseed (Brassica napus L", Analele Universit??ii din Oradea - Fascicul Biologie, issue 1, pp. 45-52, 2011. AbstractCU-PDF.pdf

Rapeseed is one of the most important oilseed crops cultivated in many parts of the world and used as a source of edible oil for human consumption. The present work reports some phytochemical and nutritional potentials of different rapeseed cultivars with a view to exploit their benefits for human nutrition. Five rapeseed cultivars namely; pactol, silvo, topas, serw 4 and serw 6 were analyzed for their phytochemical constituents (such as glutathione, ascorbate, phenolic, flavonoid contents) and some antioxidant enzymes activity (i.e. GPX; guaiacol peroxidase, APX; ascorbate peroxidase, CAT; catalase, SOD; superoxide dismutase) together with their protein profile. Among all cultivars significant variations in glutathione, ascorbate, phenolic and flavonoid contents were observed. The highest DPPH radical scavenging activity of the extract was observed in topas cultivar. Minor variations were noticed in SDS-PAGE protein profile. The results of the study suggest the phytochemical and nutritional potentials of B. napus seeds for human and other animal uses due to their extensive consumption in the world

Rasmy, G. E., W. K. B. Khalil, S. A. Moharib, A. A. Kawkab, and E. W. Jwanny, "Dietary Fish Oil Modulates the Effect of Dimethylhydrazine-Induced Colon Cancer in Rats", grasas y aceites, vol. 62, issue 3, pp. 253-267, 2011. AbstractCU-PDF.pdf

This study was conducted to examine the efficacy of fish oil supplementation in male wistar rat colon carcinogenesis.In order to induce colon cancer, the rats were given a weekly subcutaneous injection of 1,2-Dimethyl hydrazine (DMH) at a dose of 20 mg/kg b.w. for five weeks. Afterwards, some of the rats ingested fish oil for either 4 weeks (DMH-FO4 group), or 17 weeks (DMH-FO17 group). The remaining rats continued without any supplementation for the same 4 weeks (DMH4 group), or 17 weeks (DMH17 group). Another two groups of rats did not receive the DMH and were given fish oil (FO17 group) or a normal diet only and considered as the control group (CN group). At the end of the experiment, the rats were sacrificed; and were subsequently subjected to biochemical and molecular biological analyses as well as histopathological examinations. The results showed increased levels of lactate dehydrogenase (LDH), malondialdehyde (MDA) and alkaline phoshatase (ALP) activities in the DMH rats compared to the control. The liver and colonic changes that were induced by DMH were significantly improved through fish oil supplementation in the DMH-FO17 group. The molecular analysis revealed that DMH treatment induced the expression alterations of genes p53, p27 and p21 and increased DNA band patterns related to cancer, while both FO17 and DMH-FO17 groups showed much better results. A histopathological examination of the DMH17 group revealed colon adenocarcinoma and several lesions in rat liver tissues. An improvement in the histopathological picture was seen in the livers and colons of groups DMH- FO17. In conclusion, the present results demonstrated the anti-carciongenic effect of herring fish oil against DMH induced colon carcinogenesis in rats. The inhibitory effect ofFO was due to the modulation of elevated biochemical parameters, DNA damage and histopathological lesions caused by DMH.

Kader, A. M. M., M. Y. Elzayat, T. R. Hammad, A. I. Aboud1, and H. Abdelmonem, "Dielectric Permittivity, Ac Conductivity and Phase Transition in Hydroxylammonium Sulfate", Physica Scripta, 2011.
Elnasharty, I. Y., A. K. Kassem, M. Sabsabi, and M. A. Harith, "Diagnosis of Lubricating Oil by Evaluating Cyanide and Carbon Molecular Emission Lines in Laser Induced Breakdown Spectra", Spectrochimica Acta, vol. 66, issue 8, pp. 588–593, 2011. AbstractCU-PDF.pdf

To prevent engine failure it is essential to change lubricating oil regularly before it loses its protective properties. It is also necessary to monitor the physical and chemical conditions of the oil to reliably determine the optimum oil-change intervals. The present work focuses on studying evolution of the cyanide (CN) and carbon (C2) molecular spectral emission lines in the laser induced breakdown spectra of lubricating oil as a function of its consumption.

Al-Ghamdi, A., K. Morsy, A. - R. Bashtar, F. Abdel-Ghaffar, K. Al-Rasheid, S. Al-Quraishy, and H. Mehlhorn, "Developmental Stages of Hepatozoon hemprichii sp", Journal of Parasitology, 2011.
Mohareb, R. M., H. H. Ahmed, G. A. Elmegeed, M. M. Abd-Elhalim, and R. W. Shafic, "Development of New Indole-derived Neuroprotective Agents", Bioorganic & Medicinal Chemistry, vol. 19, issue 9, pp. 2966–2974, 2011. CU-PDF.pdf
Khatib, E. K. M., and A. R. M. Hameed, "Development of Cu2O/Carbon Vulcan XC-72 as non-enzymatic sensor for glucose determination", Biosensors and Bioelectronics, 2011. Abstract
Choi, J. - H., M. I. R. Mamun, A. A. M. El-Aty, J. - H. Park, E. - H. Shin, J. Y. Park, S. - K. Cho, S. C. Shin, K. B. Lee, and J. - H. Shim, "Development of a Single-Step Precipitation Cleanup Method for the Determination of Enrofloxacin, Ciprofloxacin, and Danofloxacin in Porcine Plasma", Food Chemistry, vol. 127, issue 4, pp. 1878–1883, 2011. AbstractCU-PDF.pdf

In this study, we describe a newly developed and simple analytical method using high-performance liquid chromatography coupled to fluorescence detector (HPLC-FLD) for the determination of enrofloxacin, ciprofloxacin, and danofloxacin in porcine plasma. A single-step sample preparation, including extraction with acidic acetonitrile, coagulation with ammonium acetate, and centrifugation made possible the direct analysis of plasma samples without the need for any further cleanup procedure. The developed method was validated with specificity, linearity, limit of detection (LOD), limit of quantitation (LOQ), accuracy, and precision. All results were fully adequate. In the study using porcine plasma incurring enrofloxacin, the developed method proved capable of quantifying concentrations below its maximum residue limit, and its time-course residues were excreted within the 10-day withdrawal time.

Park, J. - Y., J. - H. Choi, A. A. M. El-Aty, B. M. Kim, J. - H. Park, W. J. Choi, and J. - H. Shim, "Development and Validation of an Analytical Method for Determination of Endocrine Disruptor, 2,4-D, In Paddy Field Water", Biomedical Chromatography, vol. 25, issue 9, pp. 1018–1024, 2011. Abstract

The acidic herbicides are an important class of chemical compounds that are used to control a variety of weeds that threaten many crops. Owing to their low microbial activity levels, the acidic herbicides exhibit a residual activity remaining for periods of up to several months in soils and water. The principal objective of this study was to develop an analytical method based on liquid–liquid and solid-phase extraction followed by HPLC, for the determination of 2,4-D in paddy field water. The residues were verified via tandem mass spectrometry (MS/MS) in negative-ion electrospray ionization (ESI) mode. Linearity was good over a concentration range of 1–100 µg/L with a correlation coefficient (r2) of 0.999. The mean recovery rates of triplicate results ranged from 85.2 to 90.85%. The limits of detection and quantitation were 0.4 and 1.0 µg/L, respectively. The method proposed herein was applied to field samples acquired from Hampyung and Sunchang counties, Republic of Korea. The analyte was detected at a concentration range of 6.8–12.8 and 3.55–24.0 µg/L, respectively.

Park, J. H., M. I. R. Mamun, A. A. M. El-Aty, T. W. Na, J. - H. Choi, M. W. Ghafar, K. S. Kim, S. D. Kim, and J. - H. Shim, "Development and Validation of a multiresidue Method for Determination of 37 Pesticides in Soil using GC-NPD", Biomedical Chromatography, vol. 25, issue 9, pp. 1003–1009, 2011. Abstract

In this study, a multiresidue analytical method for the detection of 37 pesticides in a soil matrix was developed and validated. The soil sample was fortified with a known quantity of pesticides at two different concentration levels (0.1 and 0.01 µg/g) and the analytes were extracted via a liquid–solid extraction method. The pesticides were separated on an HP5 capillary column and were analyzed with a gas chromatograph coupled to a nitrogen–phosphorous detector (GC-NPD). Method validation was accomplished with good linearity (r2 = 0.994–0.999) within a considerable range of concentrations. Satisfactory recoveries (70.5–110.4%) were obtained with 32 pesticides at both spiking concentration levels, whereas five pesticides—dimepiperate, buprofezin, prometryn, pirimicarb, and fludioxonil—were recovered at relatively low levels (43.6–61.8%). The applicability of the method was demonstrated by analyzing field samples collected from 24 different sites around Yeongsan and Sumjin rivers in the Republic of Korea. No residues of the selected pesticides were detected in any of the samples. The developed method could be employed as a simple and cost-effective method for the routine detection and analysis of 37 pesticides in soil samples.

Cho, H. - J., K. Jo, H. Yi, S. M. Cho, A. A. M. El-Aty, M. K. Kim, S. B. Han, J. H. Oh, C. H. Kwon, J. - H. Shim, et al., "Development and Validation of A Liquid Chromatography Method with Electrospray Ionization Tandem Mass Spectrometry for the Determination of Brotizolam Residues in Beef and Commercial Whole Milk", Biomedical Chromatography, vol. 25, issue 9, pp. 1061-6, 2011. CU-PDF.pdf
Liu, X., A. A. M. El-Aty, J. - Y. Park, J. - H. Park, S. - K. Cho, H. - C. Shin, and J. - H. Shim, "Determination of Spinetoram in Leafy Vegetable Crops using Liquid Chromatography and Confirmation via tandem mass Spectrometry", Biomedical Chromatography, vol. 25, issue 10, pp. 1099-106, 2011. AbstractCU-PDF.pdf

Spinetoram is a second-generation member of the spinosyn class, all members of which have been shown to be effective in insect control via a novel mode of action. Spinetoram is a mixture of 3'-O-ethyl-5, 6-dihydro spinosyn J (XDE-175-J) and 3'-O-ethyl spinosyn L (XDE-175-L). In order to establish a determination method for the analysis of spinetoram residues in crops, commercial product (5% suspension concentrate spinetoram) was applied to two leafy vegetables (Garland chrysanthemum and Aster scaber) on different spraying schedules. The analytical method used herein was based on a reversed-phase separation on a C(18) column, isocratic elution and UV detection. The analytes were confirmed via tandem mass spectrometry. The method was linear over a concentration range of 0.05-10 ppm with a correlation coefficient in excess of 0.9998. The recoveries of XDE-175-J and XDE-175-L from the two vegetables ranged between 86.04 and 98.87% at spiking levels of 1 and 5 ppm. The relative standard deviations were no more than 7% for all recovery tests conducted herein. The calculated limits of detection and quantification were 0.01 and 0.03 ppm for both XDE-175-J and XDE-175-L. The levels of residues in two vegetables treated under a fixed schedule in the greenhouse were 6.21-0.55 ppm (maximum residue limit (MRL) = 7 ppm). In sum, this method constitutes an easy and reliable technique for the determination of spinetoram in leafy vegetables.

Jeong, W. Y., J. S. Jin, Y. A. Cho, J. H. Lee, S. Park, S. W. Jeong, Y. - H. Kim, C. - S. Lim, A. A. M. El-Aty, G. - S. Kim, et al., "Determination of Polyphenols in Three Capsicum Annuum L", Journal of Separation Science, vol. 34, issue 21, pp. 2967-74, 2011. AbstractCU-PDF.pdf

A mixture of polyphenol components was isolated from the fruits of C. annuum L. cv. Cupra, C. annuum L. cv. Orange glory, and C. annuum L. cv. ST4712 (CLST), via 70% methanol extraction followed by column chromatography over silica gel. The polyphenol components of the mixture were analyzed via HPLC-MS/MS and compared with the reported data. Three cinnamic acid derivatives and five flavonoid components in the fruits of the three varieties were identified for the first time in this study. The antioxidant activity and anticancer effect of the polyphenol mixtures of the three fruits were determined. The antioxidant and anticancer activities of CLST were substantially higher than those of C. annuum L. cv. Cupra and C. annuum L. cv. Orange glory. The high activities of CLST were attributed to the much higher concentration of quercetin derivatives in CLST.

Atta, N. F., A. Galal, and S. M. Azab, "Determination of morphine at gold nanoparticles/Nafion", Analyst., vol. 136, pp. 4682-4692, 2011. AbstractCU-PDF.pdf

Novel and effective electrochemical sensor for the determination of morphine (MO) in 0.04 mol L-1 universal buffer solution (pH 7.4) is introduced using gold nanoparticles electrodeposited on a Nafion modified carbon paste electrode. The effect of various experimental parameters including pH, scan rate and accumulation time on the voltammetric response of MO was investigated. At the optimum conditions, the concentration of MO was determined using differential pulse voltammetry (DPV) in a linear range of 2.0 x 10-7 to 2.6 x 10-4 mol L-1 with a correlation coefficient of 0.999, and a detection limit of 13.3 x 10-10 mol L-1, respectively. The effect of common interferences on the current response of morphine namely ascorbic acid (AA) and uric acid (UA) is studied. The modified electrode can be used for the determination of MO spiked into urine samples, and excellent recovery results were obtained.