Green Synthesis of Copper Nano-Drug and Its Dental Application upon Periodontal Disease-Causing Microorganisms

( Sanaa M. F. Gad El-rab ),( Sakeenabi Basha ),( Amal A. Ashour ),( Enas Tawfik Enan ),( Amal Ahmed Alyamani ),( Nayef H. Felemban ) 한국미생물 · 생명공학회 2021 Journal of microbiology and biotechnology Vol.31 No.12

Dental pathogens lead to chronic diseases like periodontitis, which causes loss of teeth. Here, we examined the plausible antibacterial efficacy of copper nanoparticles (CuNPs) synthesized using Cupressus macrocarpa extract (CME) against periodontitis-causing bacteria. The antimicrobial properties of CME-CuNPs were then assessed against oral microbes (M. luteus. B. subtilis, P. aerioginosa) that cause periodontal disease and were identified using morphological/ biochemical analysis, and 16S-rRNA techniques. The CME-CuNPs were characterized, and accordingly, the peak found at 577 nm using UV-Vis spectrometer showed the formation of stable CME-CuNPs. Also, the results revealed the formation of spherical and oblong monodispersed CME-CuNPs with sizes ranged from 11.3 to 22.4 nm. The FTIR analysis suggested that the CME contains reducing agents that consequently had a role in Cu reduction and CME-CuNP formation. Furthermore, the CME-CuNPs exhibited potent antimicrobial efficacy against different isolates which was superior to the reported values in literature. The antibacterial efficacy of CME-CuNPs on oral bacteria was compared to the synergistic solution of clindamycin with CME-CuNPs. The solution exhibited a superior capacity to prevent bacterial growth. Minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and fractional inhibitory concentration (FIC) of CME-CuNPs with clindamycin recorded against the selected periodontal disease-causing microorganisms were observed between the range of 2.6-3.6 μg/ml, 4-5 μg/ml and 0.312-0.5, respectively. Finally, the synergistic antimicrobial efficacy exhibited by CME-CuNPs with clindamycin against the tested strains could be useful for the future development of more effective treatments to control dental diseases.

Detailed Design Procedures for PMSG Direct-Driven by Wind Turbines

Ahmed Hebala,Walid A. M. Ghoneim,Hamdy A. Ashour 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1

This paper is committed to show a well-ordered system used to design a permanent magnet synchronous generator (PMSG). The fundamental focus of this work is the generators which are in gearless configuration, and in the fragmentary or couple of kilowatts power range. A straight lumped-component based model is introduced, which is utilized for fundamental investigation and design. Later, a proposed comprehensive design strategy—stated with conditions, tables, design limits and practical recommendations—are presented in full details. Likewise, a flowchart is created to be later used as a Matlab M-File code for PMSG design. The outlined strategies are then authenticated through three case studies while being compared to the result from Finite Element Method (FEM) of Maxwell package. The three case studies are firstly, comparing the effectiveness of the procedures with a PMSG presented in literature. Secondly compared to a generator from the market. And finally using the procedure to implement a 1 kw prototype generator and validate the results with it. Such comparisons have validated the proposed procedures as a contributed step-by-step simple and reliable design tool for such cluster of PMSGs.

Effect of the Volatile Oil of Nigella sativa Seeds and Its Components on Body Temperature of Mice: Elucidation of the Mechanisms of Action

M. M. Ashour,K. E. H. El Tahir,M.G. Morsi,N.A. Aba-Alkhail 한국생약학회 2006 Natural Product Sciences Vol.12 No.1

effect(s) of the volatile oil (VO) of Nigella sativa and its two components, α-pinene and ρ-cymeneon body temperature of male and female conscious mice were studied. Further investigations to delineate themechanism(s) of action of the observed efect(s) by using various blockers involved in the central regulation ofbody temperature were made. VO and α-pinene caused significant reductions in rectal body temperature at is and30 minute after treatment. ρVO and α-pinene-induced hypothermia significantly. Nalbuphine inhibited α-pinene-induced hypothermiasignificantly but did not affect VO-induced hypothermia. Droperidol potentiated VO and α-pinene-inducedhypothermia to a non-significant level; whereas atropine potentiated VO-induced hypothermia non-significantly.The study confirms further the role of serotoninergic receptors in the mechanism(s) of the observedpharmacological efects of the VO of Nigella sativa. It also indicated a possible role of opioid receptors in α-KeywordsNigella sativa, α-pinene, ρ-cymene, receptor blockers, serotoninergic receptors

Effective and highly recyclable nanosilica produced from the rice husk for effective removal of organic dyes

Gehan M.K. Tolba,나지르,A.M. Bastaweesy,E.A. Ashour,Wael Abdelmoez,Mohamed H. El-Newehy,Salem S. Al-Deyab,김학용 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-

Amorphous nanosilica separated from rice-husk at yield of 81% by hydrothermal technique is introducedas effective and reusable adsorbent for the organic pollutants. The prepared nanosilica is spheroid with aparticle size of 10–50 nm. As adsorbent, the results indicated that the nanosilica could remove 65% fromthe methylene blue dye (10 ppm) within the first minute. The calculated thermodynamic parametersindicated that the adsorption of MB is spontaneous and endothermic. Interestingly, regeneration of theintroduced material by caclination at 450 8C enhanced the adsorption process as the removingpercentage was linearly depending on the number of the successive cycles.

Clustering Algorithms in Echo State Networks

Wesam M. Ashour,Abdallatif S. Abu-Issa,Olaf Hellwich 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.5

In this work, we develop a new method of setting the input to reservoir and reservoir to reservoir weights in echo state machines. We use a clustering technique which we have previously developed as a pre-processing stage to set the reservoir parameters which at this stage are prototypes. We then use these prototypes as weights in the standard architecture while setting the reservoir to output weights in a standard manner. We show results on a variety of data sets in the literature which show that this method out-performs a standard random echo state machine.

Consumer Adoption of Self-Service Technologies: Integrating the Behavioral Perspective with the Technology Acceptance Model

ASHOUR, Mohammed L.,AL-QIREM, Raed M. Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.3

Recent technological advancements have had a substantial impact on consumer buying behavior. This research aims to determine the factors affecting consumer behavior related to the adoption of self-service technologies (SSTs). The intended findings of this study are expected to contribute to understanding consumer behavior towards the adoption of SSTs taking into account the logic of two main theories in this regard: the Technology Acceptance Model (TAM) and the assumptions of the Behavioral Perspective Model (BPM). This research follows a triangulation approach. Consequently, a number of semi structured interviews were conducted with experts and executive directors from selected SSTs providers in Jordan. In addition, the convenience sampling technique was employed focusing on current (or) previous users of SSTs in the public and private sectors in Jordan using a self-administrative questionnaire (66% response rate). The results confirmed the influence (direct and indirect) of previous experience and personal initiatives and characteristics on consumer intention to use SSTs. In addition, the results indicated the important role of the mediator variables namely: perceived ease of use (EOU), perceived risk (PR), and perceived usefulness (PU) on consumer attitude towards SSTs which in turn will positively affect consumer intention to use SSTs.

Effectiveness of Calcium Nitrite in Retarding Corrosion of Steel in Concrete

L. Abosrra,M. Youseffi,A. F. Ashour 한국콘크리트학회 2011 International Journal of Concrete Structures and M Vol.5 No.1

Corrosion of steel bars embedded in concrete admixed with 0%, 2% and 4% calcium nitrite (CN), having compressive strengths of 20 and 46 MPa was investigated. Reinforced concrete specimens were immersed in 3% NaCl solutions for 1, 7 and 15 days where 0.4A external current was applied to accelerate the chemical reactions. Corrosion rate was measured by retrieving electrochemical data via potentiodynamic polarization technique. Pull-out tests of reinforced concrete specimens were then conducted to assess the corroded steel-concrete bond characteristics. Experimental results showed that corrosion rate of steel bars and steel-concrete bond strength were dependent on concrete strength, amount of CN added and accelerated corrosion period. As concrete strength increased from 20 to 46 MPa, corrosion rate of embedded steel decreased. The addition of 2% CN to concrete of 20 MPa was not effective in retarding corrosion of steel at long time of exposure. However, the combination of higher strength concrete and 2% or 4% CN appear to be a desirable approach to reduce the effect of chloride-induced corrosion of steel reinforcement. After 1 day of corrosion acceleration, specimens without CN showed higher bond strength in both concrete mixes than those with CN. After 7 and 15 days of exposure, the higher concentration of CN, the higher bond strength in both concrete mixes achieved, except for the concrete specimen of 20 MPa compressive strength with 2% CN that recorded the highest deterioration in bond strength at 15 days of exposure.

Effectiveness of Calcium Nitrite in Retarding Corrosion of Steel in Concrete

Abosrra, L.,Youseffi, M.,Ashour, A.F. Korea Concrete Institute 2011 International Journal of Concrete Structures and M Vol.5 No.1

Corrosion of steel bars embedded in concrete admixed with 0%, 2% and 4% calcium nitrite (CN), having compressive strengths of 20 and 46 MPa was investigated. Reinforced concrete specimens were immersed in 3% NaCl solutions for 1, 7 and 15 days where 0.4A external current was applied to accelerate the chemical reactions. Corrosion rate was measured by retrieving electrochemical data via potentiodynamic polarization technique. Pull-out tests of reinforced concrete specimens were then conducted to assess the corroded steel-concrete bond characteristics. Experimental results showed that corrosion rate of steel bars and steel-concrete bond strength were dependent on concrete strength, amount of CN added and accelerated corrosion period. As concrete strength increased from 20 to 46 MPa, corrosion rate of embedded steel decreased. The addition of 2% CN to concrete of 20 MPa was not effective in retarding corrosion of steel at long time of exposure. However, the combination of higher strength concrete and 2% or 4% CN appear to be a desirable approach to reduce the effect of chloride-induced corrosion of steel reinforcement. After 1 day of corrosion acceleration, specimens without CN showed higher bond strength in both concrete mixes than those with CN. After 7 and 15 days of exposure, the higher concentration of CN, the higher bond strength in both concrete mixes achieved, except for the concrete specimen of 20 MPa compressive strength with 2% CN that recorded the highest deterioration in bond strength at 15 days of exposure.

Image Zooming and Multiplexing Techniques based on K-Space Transformation

A. Ammar,E.M. Saad,I. Ashour,M. Elzorkany 보안공학연구지원센터(IJSIP) 2012 International Journal of Signal Processing, Image Vol.5 No.4

A Dynamic Method for Discovering Density Varied Clusters

Mohammed T. H. Elbatta,Wesam M. Ashour 보안공학연구지원센터(IJSIP) 2013 International Journal of Signal Processing, Image Vol.6 No.1