Jeddah, Saudi Arabia
Jeddah, Saudi Arabia

Time filter

Source Type

El-Gammal O.A.,Mansoura University | Elmorsy E.A.,King Abd El Aziz University | Elmorsy E.A.,Mansoura University | Sherif Y.E.,Mansoura University | Sherif Y.E.,Taibah University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

New Cu(II) and Zn(II) complexes of 2-(naphthalen-1-yloxy)-N′-(1- (pyridin-2-yl)ethylidene) acetohydrazide (HA2PNA) have been prepared and characterized by elemental analyses, spectral (IR, UV-visible, ESR and 1H NMR) as well as magnetic and thermal measurements. According to the data, the complexes assigned the formulae: [Cu(A2PNA)2]H 2O and [Zn(A2PNA)(OAc)(H2O)], respectively. IR data revealed that the ligand acts as before ONN and after morever ONN mononegative tridentate via deprotonated carbonyl oxygen (CO) and both (CN)imine and (CN)pyridine nitrogen atoms. The bond lengths, bond angles, HOMO, LUMO, dipole moment and charges on the atoms have been calculated by using density functional theory (DFT) at B3LYP level with 6-31G and 6-31G(d,p) basis sets to confirm the geometry of the ligand and the investigated complexes. Also, the kinetic parameters were determined for each thermal degradation stage of the complexes using Coats-Redfern and Horowitz-Metzger methods. Moreover, the complexes have been tested for anti-inflammatory and analgesic activity in rat model of collagen adjuvant arthritis and compared with piroxicam. All the compounds showed a significant anti-inflammatory and analgesic effect versus piroxicam. © 2013 Elsevier Ltd. All rights reserved.


El-Kasheif M.A.,National Institute of Oceanography and Fisheries of Egypt | Authman M.M.N.,National Research Center of Egypt | Al-Ghamdi F.A.,King Abd El Aziz University | Ibrahim S.A.,Benha University | El-Far A.M.,National Institute of Oceanography and Fisheries of Egypt
Journal of Fisheries and Aquatic Science | Year: 2015

In the present investigation, age, growth, mortality, exploitation, yield and biomass and reproduction of Nile tilapia (Oreochromis niloticus) from El-Bahr El-Faraouny Canal, Al-Minufiya Province, Egypt, were determined. The regression parameter “n” of dependence of total weight upon total length was found to be negative allometric growth. The coefficients of condition were computed. The annual rings on fish scales were used for age determination. The longevity of this species was found to be 6 years. The maximum increase in length was noted during the first year of life and showing a gradual decrease in growth as the fish got older. The O. niloticus population had a sex ratio of 1:1.08 (M:F), which did not deviates (χ2 = 1.997, p>0.05) from the hypothetical distribution of 1:1. The maturity stages were classified macroscopically into five stages. Higher values of gonadosomatic index (GSI) for males and females occurred nearly throughout the year with peak from May to August indicating prolonged spawning season. There is a selective mortality towards smaller fish sizes. Therefore, for management purposes it is recommended that the local authorities must be set a regulation to control the illegal fishing activity and larger mesh sizes of fishing nets should be used to increase the mean lengths at first capture and their marketable sizes leading to more economic returns and also to conserve the spawning stock part of O. niloticus population. A comparison of the various parameters of O. niloticus in the present study with those of other authors in different localities and times in Egypt revealed year-to-year and geographically differences. These differences were discussed and were found to be attributed to the effect of increased pollution of the canal. Finally, the present study recommended that El-Bahr El-Faraouny Canal must be in protection against pollution. © 2015 Academic Journals Inc.


Al-Mhyawi S.R.,King College | Al-Mhyawi S.R.,King Abd El Aziz University
Oriental Journal of Chemistry | Year: 2014

The inhibition efficiency of extract of Garlic on aluminium in hydrochloric acid solutions has been evaluated by weight loss techniques. Values of inhibition efficiency obtained are dependent upon the concentration of inhibitor and temperature. Generally, inhibition was found to increase with inhibitor concentration, half-life, activation energy but decrease with temperature and firstorder rate constant at the temperatures studied. Physical adsorption mechanism has been proposed for the inhibition and Langmuir , Temkin adsorption isotherm was obeyed. Garlic is an inhibitor of aluminium corrosion in 0.5 M hydrochloric acid solution.The values of standard free energy of adsorption suggest that the adsorption of inhibitor on aluminium surface occurred by physisorption mechanism. the negative sign of the Free Energy of adsorption indicates that the adsorption of the inhibitors on the aluminum surface was a spontaneous process.the negative values of enthalpy of adsorption ("H) suggest that the chemical reaction involved in the adsorption of the inhibitors on the metal surface is an exothermic process, hence increase in the reaction temperature of the medium will decrease the inhibition efficiency.


Aly M.M.,King Abd El Aziz University | Bafeel S.O.,King Abd El Aziz University
Journal of Applied Animal Research | Year: 2010

The antimicrobial activities of water and organic crude extracts of 6 medicinal plants (Azadirachta Indica (neem), Zingiber officinale (ginger), Eucalyptus globules, Lawsonia inermis, Lepidium sativum and Rosmarinus officinalis) were detected against different pathogenic yeasts and fungi including strains that were highly resistant to amphotericin B and ketoconazole. Two species of yeasts: Candida albicans and C. tropicals and different species of fungi were used as test organisms. The most active antimicrobial plants were the extract of A. indica, Z. officinale, E. globules and L. inermis with minimal inhibitory concentration (MICs) values ranging from 100-250 μg I ml. Moderate toxicity was recorded at 500 μg/ml for A. Indica and at 600 μg/ml for E. globules. No antitumor activities for the different plant extracts were recorded using the biochemical induction assay (BIA) and Escherichia coli as a test organism. In conclusion, these plants are rich in a wide variety of secondary metabolites, which have been found in vitro to have antimicrobial properties © GSP, India.


Sahab A.F.,National Research Center of Egypt | Nawar L.S.,King Abd El Aziz University
International Journal of ChemTech Research | Year: 2015

The aim of the current study were to determine the quality of Moringa oleifera seeds and to detect the in-vitro antifungal activity of seed extracts and their phytochemical and elemental composition. Seeds of moringa recently collected or stored for one to three years were contaminated with fungi with an average of 48.44% on PDA medium. The percentage of fungal infection was higher in seeds produced during season of 2011(stored for 3 years), followed by seeds produced at season of 2012 with significant difference (87.50 and 50.00% respectively). Moringa seeds recently collected during season of 2014 showed low fungal densities than the corresponding figures of stored seeds for 1-3 years. Fourteen species which belong to nine genera were detected and they were classified as, Alternaria alternata (11.82%), Aspergillus candidus (4.32%), A. flavus (6.34%), A. niger (14.46%), A. regulosus (1.87%), A. sydowi (3.08%), A. terreus (6.09%), Chaetomium globosum (7.55%), Fusarium solani (2.35%), Helminthosporium sp. (5.97%), Macrophomina phaseolina (6.88), Nigrospora sphaericica (16.69%), Rhizoctonia solani (4.19%) and Rhizopus nigricans (8.35). The ethanolic seed extract was found to be more effective than the water extract. The ethanolic seed extract at 100% cause increase in zone of inhibition in all tested fungi reaching 2.70-3.77mm, whereas, at 50% concentration reaching between 1.40-1.93mm. The aqueous extract of moringa seeds at 100% concentration showed moderate activity against all tested fungi (inhibition zone between 0.43-1.33 mm) compared with the standard fungicide (inhibition zone 4.23 - 4.90 mm). The results of the phytochemical analysis revealed differences in the presence of components among the seed extracts. The total phenol was decreased from 7.00 to 3.19 mg/g (54.4% decrease) and total flavonoids from 0.697 to 0.550 mg/g (21.09 decrease) in moringa recently collected (2014) and stored seeds for 3 years respectively. The percentage of nitrogen, phosphorus and potassium were high in recently collected seeds than in the stored seeds, as the percentages were 5.6, 0.64 and 1.18 % in recently collected seeds respectively and reduced to 5.1, 0.91 and 1.11 % respectively in old seeds for 3 years. GC/MS analysis of recent collected moringa and stored seed extracts led to the identification of different compounds. Extract of recent collected seeds during season 2014 contained some compounds varied in their chemical composition and molecular weight than old seeds of 3 years. © 2015, Sphinx Knowledge House. All rights reserved.


Hegazy W.K.E.-L.,National Research Center of Egypt | Tork S.E.A.,King Abd El Aziz University | Abdel-Salam M.S.,National Research Center of Egypt
Journal of Applied Biological Sciences | Year: 2012

This work aimed to characterize recombinant strains, with a high production level of L-asparaginase, previously obtained by protoplast fusion between Bacillus subtilis and Bacillus cereus. The genetic relationship between fusants and their parents was determined using a simple PCRrestriction fragment length polymorphism (RFLP) of 16S rDNAs -based method, and by analyzing the specific L-asparaginase genes and protein patterns. Our results indicate that all fusants have morphological characteristics and specific L-asparaginase genes similar to the Bacillus cereus strain whereas protein pattern and 16S rDNAs -RFLP analysis show mixed characteristics from both parents. Different genetic relationships were found between each fusant and its parental strain. These results confirm that protoplast fusion is an important technique in strain improvement. It was used to combine genes from different organisms for creating strains with desired properties.


Sahab A.F.,National Research Center of Egypt | Waly A.I.,National Research Center of Egypt | Sabbour M.M.,National Research Center of Egypt | Nawar L.S.,King Abd El Aziz University
International Journal of ChemTech Research | Year: 2015

Chitosan (CS)-g-poly (acrylic acid) (PAA) nanoparticles, which are well dispersed and stable in aqueous solution have been prepared by template polymerization of acrylic acid in chitosan solution. The prepared CS-PAA had a white powder shape and was insoluble in water and diluted acid. The mean particles size were found to be around 50nm. FTIR spectra of CS-PAA nanoparticles for CS, the intensities of the amide band were observed clearly. The board peak appeared at 2500cm-1 , which confirmed the presence of NH3+ in the CS-PAA nanoparticles. The percentage of fungal infection of soybean seeds was ranged from 78.57 and 92.00% for samples of clark and calland soybean cultivars respectively on PDA medium, while the number of fungi as cfu/100 seeds was 156.12 and 440 respectively. Isolation trails showed eleven fungi comprising seven genera namely, Alternaria tenuis, Aspergillus flavus, A. niger, A. terreus , A. versicolor, Fusarium oxysporum, F. solani, Mucor mucedo, Penicillium spp., Rhizoctonia solani and Sclerotium rolfsii detected and identified on PDA medium. Nanochitosan (CS-g-PAA) showed a remarkable antifungal effect against some fungi isolated from soybean seeds. The % inhibition of F. oxysporum for example was significantly high (41.04 mean % inhibition) than the other tested fungi, followed by A. terreus and F. solani (40.08 and 40.00 mean % inhibition respectively. Regarding zone of inhibition, nano-chitosan exhibited high inhibition against Aspergillus niger, followed by Fusarium solani and F. oxysporum, as the zone of inhibition were 20.67, 20.33 and 20.33 mm at 100 ppm respectively. Concerning the insecticidal activity the nano-chitosan (CS-g-PAA) showed highest effect against the three insect of soybean. as the means number of eggs deposited /female were significantly decreased. Under laboratory and semifield condition, Aphis gossypii were significantly decreased to 20.9±9.1 and 28.9±9.2 eggs/female respectively as compared to 97.3±4.9 and 90.3±4.9 eggs/female in the control, respectively. The same trends were also observed against Callosobruchus maculatus and Callosobruchus maculatus insects. © 2015, Sphinx Knowledge House. All rights reserved.


Gaber H.S.,National Institute of Oceanography and Fisheries of Egypt | Ibrahim S.A.,Benha University | El-Kasheif M.A.,National Institute of Oceanography and Fisheries of Egypt | El-Ghamadi F.A.,King Abd El Aziz University
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2014

The present work reports the biochemical and histological changes in the gills, spleen and liver of Solea solea and Mugil cephalus habiting in Bardawil lagoon during three seasons of year 2012. Transferase enzymes [alanine aminotransferase (ALT) and aspartate aminotransferase (AST)] in the liver and muscles tissue of Solea solea and Mugil cephalus were measured, they are higher in S. solea than in M. cephalus. Histopathologically the gill, spleen and liver revealed varying degrees of alterations in these two fish species. The gills showed hyperplasia with fusion of adjacent lamellae, lamellar vasodilation and lamellar edema with epithelial detachment proliferation of mucus and chloride cells. The spleen showed enlargement of melanomacrophage centre (MMC), focal area of necrosis and spread of vacuoles filled with neutrophils. Dilation and congestion in hepatic sinusoids, vacuolar degeneration of the hepatocytes with necrotic focal areas and coagulative necrosis were observed in liver. Histopathology could therefore be considered an important effective tool in biomarkers of disease in fish.


Mosa A.I.,King Abd el aziz University
Journal of Materials and Environmental Science | Year: 2013

New examples of thermal tetrahedral-to-octahedral transformation were observed and studied by the thermal reactions of disodium tetrakis(aryloxo)cobaltate(II) complexes, Na2[Co(OAr)4(THF)m](THF)n [OAr = o-chloro-, o-bromo-, m-chloro-, p-bromo-, 2,4-dichloro-, 2,4-dimethyl- or 2,6-dichlorophenoxide; m = 2 (m = 0 for 2,4-dimethylphenoxide complex; n = 1-3) in the solid phase. With one exception, the original complexes were all violet and have octahedral configurations. The exception was Na2[Co(2,4-(Me)2C6H32O)4].THF, which has an intense blue color and its electronic and magnetic data were characteristic for tetrahedral cobalt(II) complexes. The aryloxide complexes of 2,6-dichloro-, m-chloro-, and p-bromophenoxide showed a two-step thermochromism (violet→blue→rose) upon heating. These steps may be due to the structure changes to tetrahedral THF-free complexes and then to an aryloxide bridged polymers containing octahedral cobalt(II) ions. The complexes of o-Chloro- and o-bromophenoxide were underwent to thermal desolvation-polymerization in one step, changing directly into the rose aryloxide bridged polymers. The complex of 2,4-DichSorophenoxide showed only one-step thermochromism (violet→blue), thus changing from octahedral to tetrahedral configuration. Whereas the complex of 2,4-Dimethylphenoxide did not show any color change and retained its tetrahedral structure till decomposition. The reverse changes of the thermal products proceeded on standing under dry THF atmosphere, for some hours or days.


The inhibitory effect of the fungicides, different formulations of bioagents and culture filtrate of some saprophytic fungal isolates against the growth of Sclerotium rolfsii was evaluated in-vitro. The obtained results indicate that all evaluated materials significantly reduced the linear growth of Sclerotium rolfsii. Rhizolex fungicide was found to highly effective and gave 100% reduction in growth when used at lower concentration (12.5ppm). The same effect was recorded at 100, 200, and 400 ppm of Top zin and at 400ppm of Score fungicide. Tazolen showed also 100% inhibition at concentrations of 100 to 400ppm.The bioagent Bio-arc (T. albium) was the most effective against S. rolfsii growth responsible for 44.66 mean % inhibition, followed by Biocure-F (T.viride) responsible for 29.08 mean % inhibition with significant difference. Bio-arc (B. megatherium), Biocure-Z (T. harzianum) and Plant guard (T. harzianum) bioagents were fare less effective, as the mean percentage inhibition were 2.81, 2.97 and 3.49% respectively. Maximum inhibition was observed in the culture filtrate of T. harzianum drawn from potato dextrose broth with mean reduction of 52.33%. Among the tested saprophytic fungal isolates, Aspergillus ochraceus and Rhizopus nigricans showed high mean reduction of 47.18 and 46.71 % respectively.The treatments with culture filtrates of all tested fungal isolates were effective in reducing mycelia growth of S. rolfsii.

Loading King Abd El Aziz University collaborators
Loading King Abd El Aziz University collaborators