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Effect of Anthocleista djalonensis A. Chev Root Extract on Testis of Matured Rats

Chinese Journal of Integrative Medicine 2020年第12期26卷 929-935页

作者： chioma yvonne ezirim Sunny O.Abarikwu Chidimma J.Mgbudom-Okah Augustine A.Uwakwe Rex-Clovis C.Njoku Aemere Ogunlaja Department of Biochemistry University of Port HarcourtChobaNigeria Department of Biological Sciences Redeemer’s UniversityEdeNigeria

Objective:To investigate the effects of different extracts of Anthocleista djalonensis on the testis and epididymal sperms of ***:Fifty male Wistar rats were randomly divided into 10 groups(n=5 in each group)and orally treated with 50,100 and 200 mg/kg body weight each of methanol,aqueous ethanol(H-EtOH)and chloroform extracts of *** oil was used as vehicle(2 mL/kg).After 60 days of treatment,testosterone(T)and cholesterol(CHOL)concentrations,catalase(CAT),lactate dehydrogenase(LDH),3β-hydroxysteroid dehydrogenase(3β-HSD)and superoxide dismutase(SOD)activities in the testes along with myeloperoxidase(MPO)activities and nitrite concentrations(NO)in the serum and testes as well as sperm quality were ***:T and CHOL concentrations along with 3β-HSD activity were significantly higher in the animals treated with the low dose than in those treated with the high dose of the chloroform extract(PH-Et OH>*** all extracts at all doses showed excellent stimulatory effects on sperm quality(count,motility and morphology),the methanol extract at the high dose was the most effective on sperm count(P<0.05).Conclusion:The chloroform ex

关键词： Anthocleista djalonensis testis epididymis sperm quality antioxidants testosterone

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Self-Coexistence Among Cognitive Radio Networks Using Risk-Motivated Channel Selection Based Deference Structure

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Tsinghua Science and Technology 2013年第3期18卷 242-249页

作者： Kenneth ezirim Shamik Sengupta Department of Computer Science Graduate Center Department of Math. and Comp. Sci. John Jay College

Among cognitive radio networks there is a persistent trend of competition to acquire under-utilized and idle channels for data transmission. The competition for spectrum resources often results in the misuse of the spectrum resources as networks experience contention in attempt to access unoccupied spectrum bands. The competitive scenario causes cognitive radio networks to incur a huge amount of loss, which constitutes a major problem of self-coexistence among networks. As a way to minimize these losses we present a self-coexistence mechanism that allows cognitive radio networks to coexist with each other by implementing a risk-motivated channel selection based on deference structure. Cognitive radio networks form deference structure community to have more efficient access to a channel of interest and can defer transmission to one another on that channel, thereby minimizing the chances of conflicts. As part of the decision making process to become a member of a deference structure community, cognitive radio networks rely on a risk-motivated channel selection scheme to evaluate the tentative deference structure channel. We provide numerical and simulation results that demonstrates the benefits of the proposed self-coexistence mechanism and show how it helps networks to coordinate their spectrum activities, minimize contention experienced and improve their utility. We also emphasize on the importance of the deference structure community size with regards to the average performance of member networks.

关键词： dynamic spectrum access cognitive radio self-coexistence deference deference structure

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Comparative Analysis and Performance Improvement of Production Lines in Champion Breweries Plc and Nigerian Bottling Company

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Journal of Mechanics Engineering and Automation 2021年第3期11卷 77-82页

作者： Ini Udofia Umoren Godson Ogubuike Osueke Kelechi Thank God ezirim Department of Mechanical Engineering Federal University of TechnologyOwerriPMB 1526Nigeria

In this study,a comparative analysis of the production lines of Champion Breweries PLC and Nigerian Bottling Company was performed in order to determine ways of improving the productivity growth in Champion Breweries *** achieve this aim,a bottling line model was developed and validated;studies were also carried out to ascertain the bottling line technical practices that are presently being adopted in the brewery *** problems affecting the smooth operation of the bottling lines were unraveled and methods of solving them have been ***,the overall equipment effectiveness(OEE)model was developed and used in the analysis in addition to other performance measurement techniques,to measure the production losses and to identify areas of process *** showed that the OEE in the existing production lines of Champion Lager Beer and Nigerian Bottling Company(Coca-Cola)is 61.5% and 62.0% *** validation technique was used to validate these production lines and as a result,the validated model shows an improvement in the OEE *** validated OEE models are 63.1% and 63.0% *** adoption of the results in these validated models will definitely lead to improved productivity of both production lines.

关键词： Analysis growth improvement measurement performance productivity

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