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Experimental and Theoretical Investigations on Copper Corrosion Inhibition by Cefixime Drug in 1M HnO<sub>3</sub>Solution

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Journal of Materials Science and Chemical Engineering 2021年第5期9卷 11-28页

作者： n’guessan Yao Silvère Diki nagnonta Hippolyte Coulibaly Ollo Kambiré Albert Trokourey Laboratoire de Constitution et Réaction de la Matière UFR SSMT Université Félix Houphou&#235 t-Boigny Abidjan C&#244 te d’Ivoire UFR Sciences et Technologies Université de Man Man C&#244 te d’Ivoire

Cefixime, a third-generation semi-synthetic cephalosporin antibiotic was used as a copper corrosion inhibitor in 1M HnO3 solution. The study was conducted through the weight loss technique at 298 - 318 K and theoretical studies based on quantum chemistry. The studied drug inhibited the corrosion of copper in 1M HnO3 over the cefixime concentration range (0.02 - 2 mM). The inhibition efficiency increased with an increase in the inhibitor concentration to reach 91.07% at 2 mM, but decreased with an increase in temperature. The thermodynamic functions related to the adsorption of cefixime on the copper surface and that of the metal dissolution were computed and analyzed. The results point out spontaneous adsorption, mainly through a physisorption mechanism following Langmuir adsorption isotherm model and an endothermic dissolution process. Quantum chemical calculations were also performed at B3LYP level with 6-31G (d, p) basis set and lead to molecular descriptors such as EHOMO (energy of the highest occupied molecular orbital), ELUMO (energy of the lowest unoccupied molecular orbital), ΔE (energy gap) and μ (dipole moment). The global reactivity descriptors such as χ (electronegativity), χ (global hardness), S (global softness), and ω (electrophilicity index) were derived using Koopman’s theorem and analyzed. The local reactivity parameters, including Fukui functions and dual descriptors were determined and discussed. Experimental and theoretical results were found to be in good agreement.

关键词： Cefixime Corrosion Langmuir Quantum Chemistry Weight Loss

Antioxidant and Cytotoxicity Potential of Six Synthesized Chalcones

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Pharmacology & Pharmacy 2018年第12期9卷 536-546页

作者： S. L. Kouakou M. Ouattara J. P. n’guessan S. Coulibaly A. G. Irié-n’guessan G. Kouakou-Siransy Laboratoire de Pharmacologie UFR Sciences Pharmaceutiques Université FHB Abidjan Cote d’Ivoire Departement Chimie Therapeutique et de Chimie Organique UFR Sciences Pharmaceutiques Universite FHB Abidjan Cote d’Ivoire

Background: Chalcones are open-chain flavonoids which display a large number of pharmacological activities such as cytotoxic, anti-inflammatory including antioxidant. The objective of this study was to assess antioxidant and cytotoxic activity of six synthesized chalcones. Methodology: For the current experiments, 1,3-diphenylpropenone (compound R) was used as molecular model to synthetize six compounds, namely three benzyl-benzimidazolyl-chalcones (U1, U2, WAC1) and three imidazopyridinyl-chalcones (V1, V2, V3). All the compounds were evaluated for their ability to scavenge the stable free ABTS.+ radical cation, according to the method develop by Choong et al. In addition, the cytotoxicity test described by Price et al., was performed using healthy human cell line, then in human malignant cell lines (HEP-2, A549). Results: All synthesized chalcones reduced the ABTS.+ radical cation. Indeed, benzyl benzimidazolyl compounds WAC1, U1, U2, by developing respectively 39.61%, 66.09%, and 84.20% percentages of reduction, showed an antioxidant effect 6, 11 and 14 times greater than the compound R (6.14%). As a result, imidazopyridinyl-chalcones compounds, namely V1, V2 and V3 reduced the ABTS.+ radical cation at 91.62%, 99.84% and 97.45% respectively, being 15 and 16 times more active than the compound R. About cytotoxicity, V2 inhibited not significantly HEP-2 malignant cells growth at 48.64%, compared to the standard product, i.e. doxorubicin that inhibited the growth of the same cells at 42.37%. WAC1 inhibited significantly the growth of A549 malignant cells at 89.53%, more than doxorubicin which percentage of growth inhibition was 71.58%. Conclusion: The presence of the α, β-unsaturated carbonyl system (or 1,3-diphenylpropenone) along with a benzimidazole or imidazopyridine heterocyclic ring is likely to contribute to both cytotoxic and antioxidant activities of these compounds.

关键词： Chalcones Antioxidant Cytotoxic HEP-2 A549 ABTS

Detection of Epilepsy Cases in newborns

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Engineering（科研） 2023年第2期15卷 134-142页

作者： Gérard Behou n’guessan Kouassi Saha Bernard Coulibaly Tiékoura Diarra Bassira Research and Digital Expertise Unit (UREn) Virtual University of C&#244te d'Ivoire (UVCI) Abidjan Ivory Coast Higher normal School of Abidjan Abidjan Ivory Coast Lastic ESATIC Abidjan Ivory Coast

Epilepsy is a very common worldwide neurological disorder that can affect a person’s quality of life at any age. People with epilepsy typically have recurrent seizures that can lead to injury or in some cases even death. Curing epilepsy requires risky surgery. If not, the patient may be subjected to a long drug treatment associated with lifestyle advice without guarantee of total recovery. However, regardless of the type of treatment performed, late treatment necessarily creates psychological instability in the patient. It is therefore important to be able to diagnose the disease as early as possible if we desire that the patient does not suffer from its consequences on their mental health. That is why the study aims to propose a model for detecting epilepsy in order to be able to identify it as early as possible, especially in newborns. The objective of the article is to propose a model for detecting epilepsy using data from electroencephalogram signals from 10 newborns. This model developed using the extra trees classifier technique offers the possibility of predicting epilepsy in infants with an accuracy of around 99.4%.

关键词： neonatal Epilepsy Electroencephalogram Signal Supervised Classification Random Forest Extratrees Gradient Boosting Tree

Adherence Factors Affecting Kidney Transplant Recipient among Patients on Maintenance Haemodialysis in Cote d’Ivoire

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Open Journal of nephrology 2017年第3期7卷 69-79页

作者： Delphine Amelie Lagou Albert Pessa Coulibaly luc nigue Weu Melanie Tia Monlet Cyr Guei Mohamed Ibrahim Alex Moudachirou Kan Clement Ackoundou-n’guessan Daze Apollinaire Gnionsahe nephrology Department University Teaching Hospital of YopougonAbidjanCote d’Ivoire Uro-nephrology Department Medical Science DepartmentFelix Houphouet Boigny UniversityAbidjanCote d’Ivoire Department of Public Health and Medical Informatics Medical Science DepartmentFelix Houphouët Boigny UniversityAbidjanCote d’Ivoire

Background: Kidney Transplantation is the best treatment for patients in end stage renal disease. It’s a new therapeutic approach for such patients in Cote d’Ivoire which is expected to develop. Aim: Determine the adherence factors affecting kidney transplant recipient among patients on maintenance haemodialysis in Cote d’Ivoire and point out possible obstacles to the development of this new practice in the country. Patients and Methods: This was a cross-sectional study carried out from May to June 2016 in the Haemodialysis Centres of Abidjan. Any patient aged ≥18 years, on haemodialysis for at least 6 months, who signed the inform consent were subjected to a questionnaire. none of the respondents had been transplanted. The subjects addressed in the document were sociocultural status, opinion related to kidney transplantation and willingness to be transplanted or not and the reasons. A statistical analysis was performed to determine factors associated with kidney transplantation desire. Results: We included 295 (71.53% males) patients, with a mean age of 44.53 ± 12.09 years. Among this population, 36.61% had a higher level of education, 70.85% were Christians, 66.44% lived with partners, 56.61% had no income and 74.92% were treated in Public Health Centres. The median duration on dialysis was 34 months. A total of 287 (97.29%) patients had already heard of kidney transplantation among which 149 (51.94%) for the first time after initiation of haemodialysis. There was 231 (78.31%) patients willing to be transplanted with only 91 (39.39%) of them having a potential living donors. The main motivations were the desire to stop dialysis (52.38%) and the search for a better quality of life (41.13%). Among the 64 (21.69%) patients unfavourable to renal transplantation, 45.31% raised its higher cost compared to haemodialysis. Duration on haemodialysis (>34 months) was significantly higher in patients willing to be transplanted compare to non-applicants (51.95% versus 37.50%,

关键词： Kidney Transplantation Adherence Factors Haemodialysis Cote d’Ivoire

Impacts of Field Harvesting and Conservation Practices on the Physical Quality of Yam “Kponan” (Dioscorea cayenensis-rotundata) of Côte D’Ivoire

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Open Journal of Applied Sciences 2022年第12期12卷 1979-1994页

作者： Yapo Hypolithe Kouadio Kouakou nestor Kouassi Daouda nimaga Yao Denis n’dri n’guessan Georges Amani Laboratory of Food Biochemistry and Technology of Tropical Products Department of Food Science and Technology NANGUI ABROGOUA University Abidjan C&ocirc te D’Ivoire Swiss Center for Scientific Research in Cô te d’Ivoire (CSRS-CI) Abidjan C&ocirc te D’Ivoire Agronomic Forestry and Environmental Engineering Department University of Man Man C&ocirc te D’Ivoire

Yam “Kponan” (Dioscorea cayenensis-rotundata) is a popular staple food in Côte d’Ivoire. However, its rapid decay during conservation prevents regular supply of markets. The objective of this study was therefore to assess the impact of field cultivation and conservation practices on some physical quality parameters of “Kponan”. To this end, “Kponan” yam from three production areas (Bondoukou, Bouna, Kouassi-Kouassikro) was cultivated in each area. At maturity, physical parameters of yams at harvest and after 3 months of storage in field were analyzed. The results showed that injury was the most significant deterioration in yam harvest. The rate of injured yams was highest for hoe-harvested in Kouassi-Kouassikro area (16.67% - 22.22%) regardless of the origin of the cuttings. The main damage observed after the 3 months of storage was rots (22.86% - 60.00%) and weight loss (8.57% - 42.86%). However, yams stored in pits in Bouna zone had less damage (40% - 48.87%) than those stored under straw huts in Bondoukou locality (100%) and at shade under a tree in Kouassi-Kouassikro area (100%). In conclusion, the physical quality of “Kponan” in field is most affected by abusive use of herbicides during weeding and clearing, hoe harvesting and storage in the shade under a tree.

关键词： “Kponan” Yam Post-Harvest Loss Cultivation Practices Conservation Practices Physical Quality

A new path to highly conducting n-dopedπ-conjugated polymers

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Science China Chemistry 2023年第1期66卷 4-6页

作者： Jean-luc Bredas John R.Reynolds Department of Chemistry and Biochemistry The University of ArizonaTucsonArizona 85721-0088United States School of Chemistry and Biochemistry School of Materials Science and EngineeringGeorgia Tech Polymer NetworkCenter for Organic Photonics and ElectronicsGeorgia Institute of TechnologyAtlantaGeorgia 30332-0400United States

In an article recently published in nature[1],Fei Huang,Yong Cao,and their co-workers report on aπ-conjugated polymer,poly(benzodifurandione),PBFDO,prepared by an oxidative polymerization and whose continuous backbon... 详细信息

关键词： conjugated conducting backbone

Endometriosis Revealed by Recurrent Hemorrhagic Ascites

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Open Journal of Obstetrics and Gynecology 2017年第12期7卷 1160-1165页

作者： Edouard n’guessan n’Goran Kouamé Jean Marc Lamine Dia Franc Gbeli Privat Guie Simplice Anongba Department of Obstetrics and Gynecology University Hospital of Treichville Abidjan Cote d’Ivoire Department of Radiology University Hospital of Yopougon Abidjan Cote d’Ivoire

Ascites is a rare manifestation of endometriosis. The case reported is that of a 26-year-old woman with recurrent massive hemorrhagic ascites. The analysis of biopsy specimens made at laparoscopy confirmed the diagnosis. The report noted pelvic endometriosis associated but there was no umbilical or pleural involvement. The evolution was favorable under a long-term hormone treatment (by GnRH analogues) with relay through continuous estrogen-progestogen. The diagnostic and therapeutic difficulties of this rare form of endometriosis are presented through a review of the literature.

关键词： Endometriosis Hemorrhagic Ascites Management

Comparative Study of Lead-Free Perovskite Solar Cells Using Different Hole Transporter Materials

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Modeling and numerical Simulation of Material Science 2019年第4期9卷 97-107页

作者： Abou Bakary Coulibaly Sampson Oladapo Oyedele n’guessan Raymond Kre Boko Aka Université nangui Abrogoua UFR des Sciences Fondamentales et Appliquées (SFA) Abidjan Côte d’Ivoire Institut de Recherche sur les Energies nouvelles (IREn) Abidjan Côte d’Ivoire

In recent years, there has been an unprecedented rise in the performance of metal halide perovskite solar cells. The lead-free perovskite solar cells (PSCs) have drawn much research interest due to the Pb toxicity of the lead halide perovskite. CH3nH3SnI3 is a viable alternative to CH3nH3PbX3. In this work,?we designed a tin-based perovskite simulated model with the novel architecture of (TCO)/buffer (TiO2)/absorber (Perovskite)/hole transport material (HTM) and analyzed using the solar cell capacitance simulator (SCAPS-1D), which is well adapted to study the photovoltaic architectures. In the paper, we studied the influences of perovskite thickness and the doping concentration on the solar cell performance through theoretical analysis and device simulation. The results are indicating that the lead-free CH3nH3SnI3 is having the greatpotential to be an absorber layer with suitable inorganic hole transport materials?like CuI (PCE: 23.25%), Cu2O (PCE: 19.17%), organic hole transport materials?like spiro-OMETAD (PCE: 23.76%) and PTAA (PCE: 23.74%) to achieve high?efficiency. This simulation model will become a good guide for the fabrication?of high efficiency tin-based perovskite solar. The results show that the lead-free CH3nH3SnI3 is a potential environmentally friendly solar cells with high efficiency.

关键词： CH3nH3SnI3 SCAPS-1D Simulator Perovskite Thickness Toxicity Influence Efficiency

Parkia biglobosa (Mimosaceae) Leaves, Fruits’ Pulp, and Barks of Stem and Root Phytochemicals Contents and Their Antioxidant Activities

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Journal of Biosciences and Medicines 2022年第4期10卷 48-62页

作者： Ange-Mariette Touré Tagouèlbè Tiho n’guessan Jean-Claude Yao Amissa Augustin Adima Department of Water Forests and Environment National Polytechnic Institute Félix Houphou&euml t Boigny Yamoussoukro C&ocirc te d’Ivoire Laboratory of Animal Science Department of Agriculture and Animal Resources National Polytechnic Institute Félix Houphou&euml t Boigny Yamoussoukro C&ocirc te d’Ivoire Laboratory of Industrial Processes Synthesis Environment and New Energies National Polytechnic Institute Félix Houphou&euml t Boigny Yamoussoukro C&ocirc te d’Ivoire

More and more Parkia biglobosa plants’ stem barks, and roots are collected for traditional medicine uses. This work aimed to quantify Parkia biglobosa plant parts total polyphenols, total flavonoids contents and their antioxidant activities. The hypothesis was that the plant parts would have different phytochemical contents. So, leaves, stem barks, root barks and mature fruit pulp were collected. Alongside the leaves, the stem and root barks were sliced, air-dried at room temperature for 30 days. Thereafter, the samples were crushed and sieved. Following this, the powders were extracted with distilled water by maceration and decoction. As a result, the decoction was more efficient than the maceration. Leaves had the highest total polyphenol content (14.68), followed by stem barks (11.69), and root barks (9.09 ± 0.43 mg GAE/g) (0.0001 ≤ p ≤ 0.0002). However, for total flavonoid contents, the stem barks were better than the other parts. Indeed, stem barks delivered 0.74 and were followed by leaves for 0.6, and root bark for 0.49 ± 0.02 mg EQ/g (0.0001 ≤ p ≤ 0.0169). Finally, the antioxidant activities were 3.07 and 2.86 ± 0.1 μmol T.E/g, respectively for stem bark, and leaves (p = 0.0532). In conclusion, there is no need to debark the stems, because, in decoction, leaves and stem barks would have the same efficacy.

关键词： Parkia biglobosa Total Polyphenols Total Flavonoids Antioxidant Activity