Export 17 results:
Sort by: Author [ Title  (Desc)] Type Year
A [B] C D E F G H I J K L M N O P Q R S T U V W X Y Z   [Show ALL]
Choi, J. - H., T. W. Na, M. I. R. Mamun, A. A. M. El-Aty, E. - H. Shin, J. - H. Park, and J. - H. Shim, "Bufferized Solvent Extraction and HPLC Fluorometric Detection Method for Sarafloxacin in Pig and Chicken Muscles", Biomedical Chromatography, 2011. AbstractCU-PDF.pdf

In this study, a method for the detection of sarafloxacin in pig and chicken muscles was developed using HPLC-FLD as a regulatory residue technique. Good extraction efficiency was achieved using a mixture of 1% orthophosphoric acid-0.2 m MgCl(2) in water and acetonitrile as an extraction solvent, and n-hexane partitioning and centrifugation for cleanup was used in the absence of dehydration. Specificity, linearity, detection and quantification limits, recovery, accuracy and precision were all validated, and all results were sufficient for the SARA regulatory residue method in pig and chicken muscles. The method developed and described herein was not only simple but also reliable, and was applied to market samples to determine their residue contents.

Ghanem, N., Salilew-Wondim, A. Gad, Tesfaye, Phatsara, E. Tholen, Looft, Schellander, and M. Hoelker, "Bovine Blastocysts With Developmental Competence To Term Share Similar Expression Of Developmentally Important Genes Although Derived From Different Culture Environments", Reproduction, 2011. CU-PDF.pdf
Aly, H., and A. Winterhof, "Boolean Functions Derived from Fermat Quotients", Cryptography and Communications, vol. 3, pp. 165-174, 2011. AbstractCU-PDF.pdf

We study Boolean functions derived from Fermat quotients modulo p using the Legendre symbol. We prove bounds on several complexity measures for these Boolean functions: the nonlinearity, sparsity, average sensitivity, and combinatorial complexity. Our mmain tools are bounds on chracter sums of Fermat quotients modulo p.

Shawali, A. S., and A. J. M. Haboub, "Bis-Enaminones as Precursors for Synthesis of Novel 3,4-Bis(Heteroaryl) Pyrazoles and 3,6-Bis-(Heteroaryl)-Pyrazolo[3,4-D]Pyridazines", Journal of Chemical Research, vol. 35, issue 6, pp. 341, 2011. AbstractCU-PDF.pdf

Coupling of bis-enaminones with benzenediazonium chloride and 3-diazo-1,2,4-triazole proved to be convenient routes for the synthesis of novel 3,4-bis(pyrazol-3-yl)pyrazoles and 3,6-bis(heteroaryl)pyrazolo[3,4-d]pyridazines which have not been reported previously. The structures of the products were elucidated on the basis of their spectral properties, elemental analyses and, wherever possible, by alternate synthesis.

Bakry, F. A., and W. H. S. S. A. H. Hamdi, "Biological, Biochemical, and Molecular Parameters of Helisoma Duryi Snailsexposed to the Pesticides Malathion and Deltamethrin", Pesticide Biochemistry and Physiology, 2011. AbstractCU-PDF.pdf

Aquatic environments get contaminated with pesticides residues that result from the application of pesticidesin agricultural practices. The present study aimed to evaluate the pesticides Malathion and Deltamethrinon biological and biochemical parameters of Helisoma duryi snails. The results showed that LC10of the two pesticides caused considerable reduction in survival rates and egg production of treated snails.

Hasheesh, W. S., R. T. Mohamed, and S. Abdel-Monem, "Biological and physiological parameters of Bulinus truncatussnails exposed to methanol extract of the plant Sesbania sesban", Advances in Biological Chemistry, vol. 1, pp. 65-73, 2011. AbstractCU-PDF.pdf

The effects of sublethal concentrations of methanol extract of sesbania sesban plant on survival rate, egg laying of Bulinus truncatus snails, hatchability of their eggs, infection rate with Schistosoma haematobium miracidia, cercarial production and certain physiological parameters of treated snails were studied. The sublethal concentrations of the tested plant extract (LC0, LC10 and LC25) caused considerable reduction in survival rates; egg production of B. runcates snails; hatchability of eggs as well as in the infectivity of Schistosoma haematobium miracidia to the snail. Also, the tested concentrations reduced the cercarial production per snail and the period of cercarial shedding. The glucose level in haemolymph of exposed snails was elevated while the glycogen, protein content and the activities of hexokinase (HK), pyruvatekinase (PK) and lactate dehydrogenase (LDH) showed a decrease in soft tissues when compared with the control group. It was concluded that the app lication of sublethal concentration of methanol extracts of Sesania sesban may be helpful in snail control as it interferes with the snails' biology and physiology.

Omran, A. A. E. - M. A., D. H. E. - D. S. El-Beltagi, D. S. M. A. El, and D. A. E. - M. R. M. Afify, Biochemical Studies On Sorghum, , 2012. cu-pdf.pdf
Mohamed, I. Kobeasy, Osama, M. Abdel-Fatah, S. A. M. El-Salam, and Z. E. - O. M. Mohamed, "Biochemical studies on Plantago major L", International Journal of Biodiversity and Conservation, 2011. Abstract

Plantago major (seeds and leaves) and Cyamopsis tetragonoloba (guar beans( were analyzed for general chemical components including, fatty acids and amino acids. Guar beans had high contents of proteins, fats and total hydrolysable carbohydrates. Plantago leaves high percentage of linolenic acid was characterized by 56.19%. While, P. major seeds and Guar beans had high percentages of linoleic acid (25.41 and 48.99%, respectively). Essential and non essential amino acids were present in all samples and Guar beans had high amounts of glutamic, arginine, aspartic and leucine. Total phenols, total flavonoids and tannin content were the highest in Plantago leaves.

Rawi, S. M., I. M. Mourad, and D. A.Sayed, "Biochemical Changes in Experimental Diabetes Before and Aftertreatment with Mangifera Indica and Psidium Guava Extracts", Int J Pharm Biomed Sci., vol. 2, pp. 29-41, 2011. AbstractCU-PDF.pdf

Male adult albino rats were used to study the hypoglycemic effect of Mangiferaindica and Psidium guajava aqueous extracts either used individually or incombination of as well as the effect of glibenclamide as reference sulfonylureasdrug at the dose level of 0.5 mg/kg body weight in streptozotocin-diabetic rats.Preliminary test using different doses of each plant indicated that the most effectivedoses were 250 mg/kg body weight for each plant. Our studies was extended toinclude the effect of the tested doses on different biochemical parameters includingserum insulin concentration, hepatic glycogen content, total proteins, total lipidsand transaminases activities in serum and liver. The obtained data of the abovementioned investigations revealed great alleviation of the impaired glucose tolerance, serum insulin and hepatic glycogen content, also serum and hepatic totalprotein contents were increased as a result of treatment. In STZ-diabetic rats, theactivities of (ALT, AST and ALP) either detected in sera or hepatic tissues wereincreased, then the activities were improved as a result of treatments.

El-Anany, A. M., and R. F. M. Ali, "Biochemical and Histopathological Effects of Administrationvarious Levels of Pomposia (SyzygiumCumini) Fruit Juice as Natural Antioxidant on Rat Health", J. Food SciTechnol, 2011. AbstractCU-PDF.pdf

The aim of the current investigation was to evaluate the effects of administration various levels (400, 800 and 1,200 ppm) of pomposia extracts as natural antioxidant in comparison with BHT as synthetic antioxidant on some biochemical activities and histopathological examination of rats.

Afify, A. E. - M. M. R., H. S. El-Beltagi, S. A. M. El-Salam, and A. A. and Omran, "Bioavailability of Iron, Zinc, Phytate and Phytase Activity during Soaking and Germination of White Sorghum", PLoS ONE 6 (10): IF: 4.411, 2011. AbstractCU-PDF.pdf

The changes in phytate, phytase activity and in vitro bioavailability of iron and zinc during soaking and germination of three white sorghum varieties (Sorghum bicolor L. Moench), named Dorado, Shandweel-6, and Giza-15 were investigated. Sorghum varieties were soaked for 20 h and germinated for 72 h after soaking for 20 h to reduce phytate content and increase iron and zinc in vitro bioavailability. The results revealed that iron and zinc content was significantly reduced from 28.16 to 32.16% and 13.78 to 26.69% for soaking treatment and 38.43 to 39.18% and 21.80 to 31.27% for germination treatments, respectively. Phytate content was significantly reduced from 23.59 to 32.40% for soaking treatment and 24.92 to 35.27% for germination treatments, respectively. Phytase enzymes will be activated during drying in equal form in all varieties. The results proved that the main distinct point is the change of phytase activity as well as specific activity during different treatment which showed no significant differences between the varieties used. The in vitro bioavailability of iron and zinc were significantly improved as a result of soaking and germinationtreatments.

Hasheesh, W. S., and R. T. Mohamed, "Bioassay of Two Pesticides on BulinusTruncatus Snails With Emphasis on Some Biological and Histological Parameters", Pesticide Biochemistry and Physiology, vol. 100, issue 1, pp. 1-6, 2011. AbstractCU-PDF.pdf


Abu-Taleb, A. M., K. E. - Deeb, and F. O. Al-Otibi, "Bioactivity of some Plant Extracts Against Drechslera Biseptata and Fusarium Solani", Journal of Food, vol. 9, pp. 769-774, 2011. AbstractCU-PDF.pdf

Phytochemical screening of Alhagi maurorum, Calotropis procera and Datura innoxia extracts revealed the presence of carbohydrates and/or glycosides, tannins, flavonoids, steroids and/or triterpenes. Moreover, anthraquinones were detected in A. maurorum and C. procera whereas alkaloids were detected in D. innoxia only. When ethyl alcohol extract prepared from D. innoxia was further fractionated by petroleum ether and chloroform, three fractions were detected. Four triterpenes subfractions (D1-D4) were isolated from petroleum ether fraction and identified as ?- amyrin, daturadiol, daturadiol-3-acetate and daturaolone. Chloroform fraction contained alkaloids which were fractionated into 3 subfractions (D5- D7) and identified as atropine, hyoscine and hyoscyamine. Two coumarin subfactions were isolated from the remaining aqueous layer and identified as scopoletin and scopolin. All the selected plant extracts were effective in inhibiting growth, sporulation, conidial germination as well as cellulase and pectinase enzymes of Drechslera biseptata and Fusarium solani, except the remaining aquaeous layer fraction of ethanolic extract prepared from D. innoxia which exhibited stimulatory effect on spore production and nonsignificant effect on conidial germination as well as cellulase and pectinase enzymes of D. biseptata. Mostly F. solani was more susceptible to plant extracts than D. biseptata. It was evident that the antifungal activity of the plant extracts depended upon type of plant, solvent, extract concentration as well as fungal type and its phase of growth.

Rahoma, W. A., M. K. Ahmed, and A. F. A. El-Salam, "Binary System with Varying Mass", LAP LAMBERT Academic Publishing GmbH & Co. KG, 2011. Abstract

The present work aims, primarily, at studying the problem of two bodies with varying mass which has important practical and astrophysical applications. The ejection of mass from any body depends on many parameters, amongst the most important of which are the central condensation (which means, more or less, the degree of rigidity of the body) and the velocity of rotation which provides the external layers with the angular momentum that activates the process of ejection of mass. The procedure followed is developed in the Hamiltonian framework, and is expressed explicitly in terms of the coordinates using Lie series.

Amer, H. M., "Baculovirus Expression Vector System: an Efficient Tool for the Production of Heterologous Recombinant Proteins", African Journal of Biotechnology, vol. 10, issue 32, pp. 5927-5933, 2011. AbstractCU-PDF.pdf

Today, the recombinant proteins become a major foundation of different industrial sectors. Products ofthese industries enhance the fields of medicine, pharmacology, agriculture, nutrition, petrochemicals,paper, textiles and many others. Since the mid 1980s, recombinant DNA technology has enabled thedevelopment of a wide diversity of vectors for expression of the desired recombinant protein innumerous prokaryotic and eukaryotic organisms. Baculovirus expression vector system is consideredone of the most successful and widely acceptable means for the production of recombinant proteins inextremely large quantities.

Mohamed, M., I. M. Moussa2, K. F. Mohamed, A. Samir, E. A. Nasr, M. H.Ashgan, S. AlRejaie, and M. E. Hatem, "BACTEC MGIT 960 TM system for screening of Mycobacterium Tuberculosis Complex Among Cattle", African Journal of Biotechnology, vol. 10, pp. 13919-13923, 2011. CU-PDF.pdf
Aboul-Enein, A. M., A. M. Al-Abd, E. A. Shalaby, F. Abul-Ela, A. A. Nasr-Allah, A. M. Mahmoud, and H. A. EL-SHEMY, "Back To Nature: Spotlight in Cancer Therapeutics", Vital Signs, 2011. AbstractCU-PDF.pdf

Between 1950 and the beginning of the 21st century, the mortality rates for cancer did not significantly improve. Despite the discovery of dozens of novel anticancer drugs, cancer remains the leading cause of death worldwide. There are wide gaps between the disease incidence (0.16%), disease burden (5.6 %), and the mortality caused by cancer (12.5 %).1 However, in countries with a wide diversity of plant life, there have been intensified efforts to discover natural cancer therapeutics.