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Prime Ideals in Right Complement Bounded Rings
Hamed E. A BULKHEIR ..et al. KYUNGPOOK UNIVERSITY 1996 Kyungpook mathematical journal Vol.36 No.1
A ring R is right complement bounded (strongly right bounded) if every nonzero right complement (right ideal) contains a nonzero two-sided ideal. For these rings we discuss the set of nilpotent elements and show that the right singular ideal Z_(n) and its closure Z_(2) are completely prime. Furthermore the inessential prime ideals and the inessential maximal right ideals are described. A decomposition of a right continuous strongly right bounded ring with unity and no infinite sets of orthogonal central idempotents is given.
Development of electroless Ni–P modified aluminum substrates in a simulated fuel cell environment
Amani E. Fetohi,K.M. El-Khatib,R.M. Abdel Hameed 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
The corrosion resistance of electroless Ni–P coating on pure Al, Al 6061, Al 3004 and Al 1050 is examinedin an environment simulated to PEM fuel cell. Potentiodynamic polarization techniques, Interfacialcontact resistance, surface morphology, chemical composition of coated substrates and EISmeasurements have been investigated. Modified Al 1050 showed reduction in its corrosion currentdensity by 44.69 times. It also showed the best stability of all modified Al substrates. The formed Ni–Player on Al 1050 is thicker by about 3 times, relative to that on Al 6061 and has higher Ea value of135.68 kJ mol 1 supporting its lower corrosion rate.
Amr E. El Hakim,Sobhy Abdel-Shafy,Amira M. K. Abouelella,Ragaa R. Hamed,Yasser E. Shahein 대한수의학회 2011 JOURNAL OF VETERINARY SCIENCE Vol.12 No.3
In order to identify antigens that can help prevent camel tick infestations, three major glycoproteins (GLPs) about 97, 66 and 40 kDa in size were purified from adult and larval Egyptian ticks, Hyalomma (H.) dromedarii, using a single-step purification method with Con-A sepharose. The purified GLPs were evaluated as vaccines against camel tick infestation in rabbits. The rabbits received three intramuscular inoculations of GLPs (20 μg/animal) on days 0, 14, and 28. In the immunoblot analysis, Sera from the immunized rabbits recognized the native GLPs and other proteins from larval and adult H. dromedarii ticks along with those from other tick species such as Rhipicephalus sanguineus but not Ornithodoros moubata. The effects of immunity induced by these GLPs were determined by exposing rabbits to adult H. dromedarii ticks. These results demonstrated that GLP immunization led to a slightly decreased reproductive index and significantly reduced rates of egg hatchability. These results demonstrated that immunization with the purified GLPs can provide protection against infestation by H. dromedarii and some other tick species. Further studies are needed to confirm the effectiveness of immunization with GLPs against other tick species.
Biological Control of Sclerotinia sclerotiorum Using Indigenous ChitinolyticActinomycetes in Jordan
M. E. W. Tahtamouni,K. M. Hameed,I. M. Saadoun 한국식물병리학회 2006 Plant Pathology Journal Vol.22 No.2
The white cottony stem rot pathogen Sclerotinia sclerotiorum was subjected to 70 different isolates of actinomycetes indigenous to Jordan as biological control agents. Forty of them demonstrated chitinase activity on crab shell chitin agar (CCA) media and they were segregated into three groups: 14 highly active, 12 moderately active, and 14 with low activity, with average clearing zones of (4.7-8.3), (3.7-4.3), and (2.3-3.3) mm surrounding colonies on CCA, respectively. Further, these isolates were able to inhibit radial mycelium growth of the pathogen and were categorized into three antagonistic groups: 13 strong, 13 moderate, and 14 weak antagonists, with antibiosis inhibition zones of (32.0-45.7), (22.7-31.3), and (3.7-22.3) mm, respectively. High levels of chitinase activity of the isolates Ma3 (8.3 mm), Ju1 (7.7 mm), and Sa8 (7.7 mm) with their antagonistic activity against mycelium growth of 45.7, 44.3, and 40.7 mm were observed, respectively. These isolates exhibited fungicidal activity against sclerotia of S. sclerotiorum. On the other hand, isolates Na5, Aj3, and Aj2 that produced no chitinase showed fungistatic effect only.
Mohamed E. Mahmoud,Azza E.H. Abdou,Aziza K. Shehata,Heba M.A. Header,Ezzat A. Hamed 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Removal of Congo red was completed in 5–20 s using microwave-enforced sorption (MES) as a sustainable technique. Nano-γ-Al2O3 was covalently bonded with 3-chloropropyltrimethoxysilane to produce γ-Al2O3-SiCl nanosorbent via microwave-assisted approach. Congo red extraction by γ-Al2O3 and γ-Al2O3-SiCl were found 58.42% and 69.41% and increased to 66.13% and 81.47%, respectively using 5 and 20 s of microwave heating. The percentage extraction of Congo red (30 mg L−1) by γ-Al2O3-SiCl was increased from 46.21% to 83.61% upon increasing the pH from 1.0 to 10.0. Other controlling conditions were investigated and optimized. Excellent recovery of Congo red from wastewater was established in 20 s.
Biological Control of Sclerotinia sclerotiorum Using Indigenous Chitinolytic Actinomycetes in Jordan
Tahtamouni M.E.W.,Hameed K.M.,Saadoun I.M. The Korean Society of Plant Pathology 2006 Plant Pathology Journal Vol.22 No.2
The white cottony stem rot pathogen Sclerotinia scierotiorum was subjected to 70 different isolates of actinomycetes indigenous to Jordan as biological control agents. Forty of them demonstrated chitinase activity on crab shell chitin agay (CCA) media and they were segregated into three groups: 14 highly active, 12 moderately active, and 14 with low activity, with average clearing zones of (4.7-8.3), (3.7-4.3), and (2.3-3.3) mm surrounding colonies on CCA, respectively. Further, these isolates were able to inhibit radial mycelium growth of the pathogen and were categorized into three antagonistic groups: 13 strong, 13 moderate, and 14 weak antagonists, with antibiosis inhibition Bones of (32.0-45.7), (22.7-31.3), and (3.7-22.3) mm, respectively. High levels of chitinase activity of the isolates Ma3 (8.3 mm), Jul (7.7 mm), and Sa8 (7.7 mm) with their antagonistic activity against mycelium growth of 45.7, 44.3, and 40.7 mm were observed, respectively. These isolates exhibited fungicidal activity against sclevotia of S. sclerotiorum. On the other hand, isolates Na5, Aj3, and Aj2 that produced no chitinase showed fungistatic effect only.
Bioactivity of Metabolites from Actinomycetes Isolates from Red Sea, Egypt
Osman, Mohamed E.,El-nasr, Amany A. Abo,Hussein, Hagar M,Hamed, Moaz M The Korean Society for Microbiology and Biotechnol 2022 한국미생물·생명공학회지 Vol.50 No.2
Actinomycetes isolated from marine habitats represent a promising source of bioactive substances. Here, we report on the isolation, identification, productivity enhancement and application of the bioactive compounds of Streptomyces qinglanensis H4. Eighteen marine actinomycetes were isolated and tested for resistance to seven bacterial diseases. Using 16S rRNA sequencing analysis (GenBank accession number MW563772), the most powerful isolate was identified as S. qinglanensis. Although the strain produced active compound(s) against a number of Gram-negative and Gram-positive bacteria, it failed to inhibit pathogenic fungi. The obtained inhibition zones were 22.0 ± 1.5, 20.0 ± 1, 16.0 ± 1, 12.0 ± 1, 22.0 ± 1 and 24.0 ± 1 mm against Bacillus subtilis ATCC 6633, Escherichia coli ATCC 19404, Enterococcus faecalis ATCC 29212, Pseudomonas aeruginosa ATCC 9027, Candida albicans ATCC 10231 and Staphylococcus aureus ATCC6538, respectively. To maximize bioactive compound synthesis, the Plackett-Burman design was used. The productivity increased up to 0.93-fold, when S. qinglanensis was grown in optimized medium composed of: (g/l) starch 30; KNO<sub>3</sub> 0.5; K<sub>2</sub>HPO<sub>4</sub> 0.25; MgSO<sub>4</sub> 0.25; FeSO<sub>4</sub>·7H<sub>2</sub>O, 0.01; sea water concentration (%) 100; pH 8.0, and an incubation period of 9 days. Moreover, the anticancer activity of S. qinglanensis was tested against two different cell lines: HepG2 and CACO. The inhibition activities were 42.96 and 57.14%, respectively. Our findings suggest that the marine S. qinglanensis strain, which grows well on tailored medium, might be a source of bioactive substances for healthcare companies.
Studies on Υ-irradiated polymer–nano calcined clay blended cement mortar composites
M.R. Ismail,E. Hamed,H.A. Abdel-Rahman,M.M. Younes,S.H. El-Hamouly 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
This study focuses on the preparation of blended cement mortars by a partial replacement of Portland cement by different ratios of nano-calcined clay. Also, the addition of PVA on blended cement mortar with different percentages. In addition to the influence of different doses of gamma rays on the physicochemical properties of the blended cement composites; the specimens are cured under tap water. Results showed that, compressive strength and bulk density of the composites increased with increasing the irradiation dose and PVA contents for certain values while, total porosity behaved in an opposite direction. XRD, SEM, TGA confirmed these conclusions.
Masoud Rahimi,Peyvand Valeh-e-Sheyda,Hamed Rashidi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
The paper deals with the development and optimization of curcumin nanosuspension by solvent/anti-solvent precipitation method in a microfluidic platform. A three-level Box-Behnken design was applied as an optimizing technique to investigate the effect of three independent operating variables, namely, volume ratios of anti-solvent to solvent, flow rate of drug solution, and curcumin concentration on the preferred response. In presence of PVP as the stabilizer, a nano-curcumin suspension was obtained in the range of 62-335nm. Analysis of variance showed that the variables with the highest effect were the linear effects of the anti-solvent to solvent ratio, and its corresponding squared term. Applying response surface methodology, curcumin nanosuspension with average size of 63.12 nm can be obtained under optimum condition As: S=15, solvent flow rate of 1.0mL/min and curcumin ethanolic concentration of 5.0mg/mL. The prepared nanoparticles were further characterized by infrared spectroscopy, scanning electron microscopy, and X-ray diffraction tests.