Autor: Okonkwo, E. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental and computational study of levofloxacin as corrosion inhibitor for carbon steel in acidic media
Autorzy:: Ikpi, M. E.
Abeng, F. E.
Okonkwo, B. O.
Powiązania:: https://bibliotekanauki.pl/articles/1118353.pdf
Data publikacji:: 2017
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Corrosion Inhibition
Polarization
levofloxacin and Adsorption
Opis:: The corrosion inhibition behaviour of levofloxacin was investigated on carbon steel by means of a 2 M HCl solution, using potentiodynamic polarization measurement and Quantum chemical studies. The inhibitive effect of the studied compound was found to increase with increasing concentration and to increase with increasing temperature. The study reveals that levofloxacin is a mixed-type corrosion inhibitor. The adsorption of levofloxacin on carbon steel surface obeys the Langmuir adsorption isotherm and involves physical adsorption mechanisms. Quantum chemical studies corroborate experimental results.
Źródło:: World News of Natural Sciences; 2017, 9; 79-90
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Factors influencing construction Stakeholders’ engagement outcome in Nigeria
Autorzy:: Ekung, S.B.
Okonkwo, E.
Odesola, I.
Powiązania:: https://bibliotekanauki.pl/articles/11878.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:: As a result of an increasing cases of community protest and opposition to construction projects in the Niger Delta during the construction stages, the present study investigated factors influencing construction stakeholders‟ engagement outcome. The aim was to determine the severity of factors influencing construction stakeholders‟ engagement in the research environment. Due to the pluralist usage of the term stakeholder, the study examined community stakeholders. Qualitative and quantitative data were collected using semi-structured interview and questionnaire survey administered on 186 respondents selected from two stakeholders groups using snowballing. 32 factors generated individually and collectively from literature, interview and practice were ranked and analysed using descriptive and inferential statistics. Gap between regulatory requirements and public expectations, location of projects, effect of cumulative development effects, poverty, and lack of information disclosure are some of the high ranking factors influencing engagement performance. Further analysis involving Levene‟s Homogeneity test indicates no significant difference in the population ranking opinion of these factors. This heterogeneous distribution demonstrates strong similarity across the population studied. These factors must therefore be smoothened in future construction engagement process to enhance successful project delivery. The study unveils inherent lacunas in construction project management which strongly correlates project performance.
Źródło:: International Letters of Natural Sciences; 2014, 15, 2
2300-9675
Pojawia się w:: International Letters of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Phytochemical Screening and Antimicrobial Activity of Ethanol and Methanol Extracts of Lantana camara Leaf
Autorzy:: Ezebo, R. O.
Okonkwo, C. C.
Ozoh, C. N.
Nwankwo, C. A.
Nwafor, E. C.
Esimai, B. G.
Achonye, C. C.
Obienyem, J. N.
Powiązania:: https://bibliotekanauki.pl/articles/1839418.pdf
Data publikacji:: 2021
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Phytochemical
Antimicrobial
Activity
Ethanol
Methanol
Lantana camara
leaf
Opis:: This study investigated the phytochemical composition and antimicrobial activities of ethanol and methanol leaf extracts of Lantana camara Linn against some clinical pathogens. The ethanol and methanol extracts were obtained by soaking each of the powdered leaf in each solvent. The soaked powdered leaf was allowed to stand for four days at room temperature and later filtered using Whatman filter paper. The filtrate was further concentrated using rotary evaporator and then freeze-dried. The minimum inhibitory concentration (MIC) of the ethanol and methanol leaf extracts was carried out using agar well diffusion method. The phytochemical analysis was done using standard techniques. Data were analysed using Analysis of Variance (ANOVA) to test for significance. Means were separated using Duncan’s Multiple Range Test (DMRT). The results of the antimicrobial activity revealed that V. cholerae was the most susceptible while E. coli was the most resistant to plant extracts. The phytochemicals present in the plant leaf had antimicrobial properties and may serve as a good substitute for resistant human pathogens.
Źródło:: World News of Natural Sciences; 2021, 37; 151-163
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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