Eclética Química Journal最新文献

Chemically modified cellulose as a potential oil adsorbent of contaminated marine ecosystems 化学改性纤维素作为污染海洋生态系统潜在的石油吸附剂

Eclética Química Journal Pub Date : 2020-04-01 DOI: 10.26850/1678-4618eqj.v45.2.2020.p54-63

A. A. Madeira, A. L. Silva, B. Dias, C. Peña, R. Oliveira

{"title":"Chemically modified cellulose as a potential oil adsorbent of contaminated marine ecosystems","authors":"A. A. Madeira, A. L. Silva, B. Dias, C. Peña, R. Oliveira","doi":"10.26850/1678-4618eqj.v45.2.2020.p54-63","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v45.2.2020.p54-63","url":null,"abstract":"Petroleum exploration, as well as environmental impacts descendant of aquatic contaminations involving sea oil spills, foments the development of new technologies of marine ecosystems protection. Acknowledged like the most abundant polymer available today worldwide, cellulose is a linear 1.4-β-glucan, composed of D-anhydroglucopyranose units, linked together by β-(l→4)-glycosidic bonds. In this study, a chemical modification route of the cellulose polymer was accomplished using glycidyl methacrylate and stearin to test its oily adsorption capacity of soybean, diesel, and residual oils. Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared (FT-IR) Analyses were applied to the characterization of the morphological and functional structure of microcrystalline cellulose. The results obtained proved the reach of an average hydrophobicity grade of 78.3±0.9% and a mass gain of MG = 2.89%, suggesting the possible insertion of hydrophobic groups onto the cellulose molecule and corroborating the hypothesis of successful grafting of glycidyl methacrylate and stearin onto the polymer. The oily adsorption tests showed a satisfactory capacity of the modified cellulose to adsorb small amounts of viscous oils, like residual oil.","PeriodicalId":11506,"journal":{"name":"Eclética Química Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74642277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Estrogenic mycotoxins in surface waters of the Rico Stream micro-basin, São Paulo, Brazil: occurrence and potential estrogenic contribution 巴西圣保罗<s:1>里科河微盆地地表水中的雌激素真菌毒素:发生和潜在的雌激素贡献

Eclética Química Journal Pub Date : 2020-04-01 DOI: 10.26850/1678-4618eqj.v45.2.2020.p23-32

E. S. Emídio, Claudia Pereira Da Silva, M. D. de Marchi

{"title":"Estrogenic mycotoxins in surface waters of the Rico Stream micro-basin, São Paulo, Brazil: occurrence and potential estrogenic contribution","authors":"E. S. Emídio, Claudia Pereira Da Silva, M. D. de Marchi","doi":"10.26850/1678-4618eqj.v45.2.2020.p23-32","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v45.2.2020.p23-32","url":null,"abstract":"The aim of this study was to assess the occurrence of zearalenone (ZEN) and its metabolites zearalanone (ZAN), α-zearalenol (α-ZEL), β-zearalenol (β-ZEL) α-zearalanol (α-ZAL), and β-zearalanol (β-ZAL) in the surface waters of northern São Paulo state (Brazil) and to evaluate the associated potential estrogenic contribution to the aquatic environment. The determination of the estrogenic mycotoxins in water samples from the Rico Stream microbasin yielded levels of up to 59 ng L-1 and their corresponding calculated estrogenic equivalent (cEEQ) values were between < 0.03 and 1.4 ng L-1, which are associated with negative effects on the reproduction and growth of some fish species. The physicochemical and microbiological parameters were evaluated to determine the water quality in the Rico stream region. This study revealed the first data about the presence of estrogenic mycotoxins in the Brazilian river waters and emphasizes the need to include these substances in future public policies concerning water quality, since these compounds are not yet legally regulated. From an environmental aspect, it is necessary to take into account the continuous introduction into surface water of microcontaminants associated with wastewater effluent, such as estrogenic mycotoxins.","PeriodicalId":11506,"journal":{"name":"Eclética Química Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72919776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Larvicidal activity, molluscicide and toxicity of the essential oil of Citrus limon peels against, respectively, Aedes aegypti, Biomphalaria glabrata and Artemia salina 柠檬皮挥发油对埃及伊蚊、光斑生物蛉和盐蒿的杀幼虫活性、杀软体虫活性和毒性

Eclética Química Journal Pub Date : 2019-10-01 DOI: 10.26850/1678-4618eqj.v44.4.2019.p85-95

Paulo Roberto Barros Gomes, Marlucy Bezerra Oliveira, D. A. De Sousa, Jeremias Caetano da Silva, R. Fernandes, H. C. Louzeiro, Rayone Wesly Santos de Oliveira, Maria do Livramento de Paula, V. E. Mouchrek Filho, M. A. Fontenele

{"title":"Larvicidal activity, molluscicide and toxicity of the essential oil of Citrus limon peels against, respectively, Aedes aegypti, Biomphalaria glabrata and Artemia salina","authors":"Paulo Roberto Barros Gomes, Marlucy Bezerra Oliveira, D. A. De Sousa, Jeremias Caetano da Silva, R. Fernandes, H. C. Louzeiro, Rayone Wesly Santos de Oliveira, Maria do Livramento de Paula, V. E. Mouchrek Filho, M. A. Fontenele","doi":"10.26850/1678-4618eqj.v44.4.2019.p85-95","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v44.4.2019.p85-95","url":null,"abstract":"In this present work, we tested the larvicidal activity, molluscicide and toxicity of the oil extracted from Citrus limon peels, respectively against third stage larvae of Aedes aegypti, snail Biomphalaria glabrata, and Artemia salina. For this, we extract the essential oil by hydrodistillation. Then, we identified and quantified the components by gas chromatography coupled to mass spectrometry (GC-MS). We tested the larvicidal and molluscicidal activity, respectively, using the method adopted by the Brazilian Ministry of Health and the World Health Organization. We calculated the lethal concentration (LC50) from the Probit method for the three biological activities with 95 %. The results of the chromatographic analysis showed that the oil has 58.81% of Limonene (major constituent) and 0.11% α-Mulene (minority component). The essential oil presented lethal concentration (LC50) for larvicidal activity, molluscicide and toxicity, respectively at 15.48, 13.05 and 743.35 mg∙L-1. Therefore, the essential oil is active against larvae of A. aegypti and snail B. glabrata and non-toxic against larvae of A. salina.","PeriodicalId":11506,"journal":{"name":"Eclética Química Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78110222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Occurrence of caffeine in wastewater and sewage and applied techniques for analysis: a review 废水和污水中咖啡因的存在及应用分析技术综述

Eclética Química Journal Pub Date : 2019-10-01 DOI: 10.26850/1678-4618eqj.v44.4.2019.p11-26

C. A. Marasco Júnior, Natália da Costa Luchiari, P. C. F. Lima Gomes

{"title":"Occurrence of caffeine in wastewater and sewage and applied techniques for analysis: a review","authors":"C. A. Marasco Júnior, Natália da Costa Luchiari, P. C. F. Lima Gomes","doi":"10.26850/1678-4618eqj.v44.4.2019.p11-26","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v44.4.2019.p11-26","url":null,"abstract":"Emerging contaminants are substances found in the environment whose concentrations vary from µg to ng L-1 and whose presence in wastewater has gained popularity in the scientific community due to the potential impacts these compounds can cause to the environment. This designation concerns the lack of legislation to regulate their discharge or even to monitor these compounds. Moreover, emerging contaminants are capable of causing harmful effects to nontarget organisms and therefore affect the ecosystem balance. There are several compounds classified as emerging contaminants such as pharmaceuticals, illicit drugs, hormones, pesticides, among others. And among them, caffeine is considered an emerging contaminant and can be highlighted due its presence in medicines, beverages, foodstuff and several other products. In addition, it is a compound used worldwide recognized as a marker of anthropogenic activity. In this review, we present a discussion about emerging contaminants, focusing on caffeine, regulatory aspects that involve the theme, as well as effects on organisms, removal technologies and techniques for analyzing these compounds in environmental matrices.","PeriodicalId":11506,"journal":{"name":"Eclética Química Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77599574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Influence of Ce(IV) ions amount on the electrochemical behavior of hybrid films in 0.1 mol L-1 NaCl solution Ce(IV)离子用量对杂化膜在0.1 mol L-1 NaCl溶液中电化学行为的影响

Eclética Química Journal Pub Date : 2019-10-01 DOI: 10.26850/1678-4618eqj.v44.4.2019.p27-56

F. S. Da Silva, H. D. De Melo, A. Benedetti, P. H. Suegama

{"title":"Influence of Ce(IV) ions amount on the electrochemical behavior of hybrid films in 0.1 mol L-1 NaCl solution","authors":"F. S. Da Silva, H. D. De Melo, A. Benedetti, P. H. Suegama","doi":"10.26850/1678-4618eqj.v44.4.2019.p27-56","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v44.4.2019.p27-56","url":null,"abstract":"In this work, the influence of ceric ions (Ce(SO4)2) addition to the hydrolysis solution on the corrosion protection afforded by organic-inorganic hybrid coating obtained from tetraethoxysilane (TEOS) and 3-methacryloxy-propyl-trimethoxysilane (MPTS) to a carbon steel substrate in 0.1 mol L-1 NaCl solution was studied. Open circuit potential (EOC) and electrochemical impedance spectroscopy (EIS) experiments were carried out and showed that the protection afforded by the organic-inorganic hybrid coating was extremely dependent on the Ce4+ ions amount. These results were in close agreement with optical microscopy observation of the degrading surfaces, both procedures showing that more protective coating was produced when 500 ppm of Ce4+ ions were added to the organic-inorganic hybrid solution. The chemical state of the organic-inorganic hybrid coating investigated by X-ray photoelectron spectroscopy (XPS) indicated that the addition of Ce4+ ions enhances the polycondensation degree of the organic-inorganic hybrid coating leading to a denser siloxane (Si-O-Si) network. A strategy using laser-induced breakdown spectroscopy (LIBS) and UV-Vis spectrometry was set up in order to verify, respectively, the presence of Ce ions within the coating structure and its oxidation state. LIBS results confirmed the incorporation of Ce ions in the coating, which, according to UV-Vis measurements, are mainly in the (IV)-oxidation state.","PeriodicalId":11506,"journal":{"name":"Eclética Química Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90830514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Rapid and selective extraction of trace amount of Pb(II) in aqueous samples using a magnetic ion-imprinted polymer and detection by flame atomic absorption spectrometry 磁性离子印迹聚合物快速选择性提取水中痕量铅(II)及火焰原子吸收光谱法检测

Eclética Química Journal Pub Date : 2019-10-01 DOI: 10.26850/1678-4618eqj.v44.4.2019.p73-84

S. Babaee, S. G. Hosseini, M. Mirzaei

{"title":"Rapid and selective extraction of trace amount of Pb(II) in aqueous samples using a magnetic ion-imprinted polymer and detection by flame atomic absorption spectrometry","authors":"S. Babaee, S. G. Hosseini, M. Mirzaei","doi":"10.26850/1678-4618eqj.v44.4.2019.p73-84","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v44.4.2019.p73-84","url":null,"abstract":"A magnetic Pb(II) ion-imprinted polymer was synthesized using magnetic Fe3O4@SiO2 nanospheres as supporter, n-benzoyl-n-phenyl hydroxylamine as ligand, 4-vinyl pyridine as monomer, ethylene glycol dimethacrylate as crosslinker and 2,2′-azobis(isobutyronitrile) as the initiator. The template was removed from the polymer using 4 mL of HCl (2 mol L-1). The chemical structure, morphology-particle size, elemental analysis, thermal behavior and magnetic properties of the sorbent were evaluated using Fourier-transform infrared spectroscopy, scanning electron microscopy & ImageJ software - Energy dispersive X-ray system, thermal gravimetric analysis and vibrating sample magnetometry. Various parameters such as pH, equilibrium extraction time, temperature and the eluent were optimized. The results showed the sorbent adsorption capacity was 92.3 mg g-1 in pH 6.0 media, equilibrium time of 7 min at 40 °C. Calibration linearity was 2-150 µg L-1 with detection limit of 0.3 µg L-1. The prepared sorbent had high selectivity and was successfully applied to the removing of lead in real samples.","PeriodicalId":11506,"journal":{"name":"Eclética Química Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76522353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Determination of trace amounts of selenium in natural spring waters and tea samples by catalytic kinetic spectrophotometry 催化动力学分光光度法测定天然泉水和茶叶样品中痕量硒

Eclética Química Journal Pub Date : 2019-10-01 DOI: 10.26850/1678-4618eqj.v44.4.2019.p57-72

R. Gürkan, Nevalnur Zeynep Gürkan

{"title":"Determination of trace amounts of selenium in natural spring waters and tea samples by catalytic kinetic spectrophotometry","authors":"R. Gürkan, Nevalnur Zeynep Gürkan","doi":"10.26850/1678-4618eqj.v44.4.2019.p57-72","DOIUrl":"https://doi.org/10.26850/1678-4618eqj.v44.4.2019.p57-72","url":null,"abstract":"In this work, a new kinetic method is described for the determination of trace Se(IV) in natural spring waters and commercial tea samples. The method is based on the activation of Se(IV) onto the indicator reaction in acidic medium. The reaction was monitored using a fixed time approach of 20 min at 680 nm. The variables affecting the reaction rate were evaluated and optimized. The method allows the determination of Se(IV) in the range of 0.0125-1.0 mg L-1 with a detection limit of 3.6 µg L-1. The precision was in range of 0.63-3.15% (as RSD %) with a higher recovery than 98.6%. The method has been found to be selective against matrix effect. The method was applied to the speciation analysis of inorganic Se species present in the selected samples. The method was statistically validated by analysis of two certified samples and comparing the obtained results to those of HG-AAS analysis. Also, the total Se levels of the samples were determined by using both methods after conversion of Se(VI) into Se(IV) in ultrasonic bath in acidic medium for 30 min at 85-90 °C. The results were in good agreement with those of HG-AAS. The Se(VI) level of the samples was calculated from the difference between amounts of total Se and Se(IV).","PeriodicalId":11506,"journal":{"name":"Eclética Química Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75231953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Characterization of nimesulide and development of immediate release tablets 尼美舒利的性质及速释片的研制

Eclética Química Journal Pub Date : 2019-07-21 DOI: 10.26850/1678-4618EQJ.V44.3.2019.P20-35

H. Rocha, R. S. Augusto, Livia D. Prado, E. Carvalho

{"title":"Characterization of nimesulide and development of immediate release tablets","authors":"H. Rocha, R. S. Augusto, Livia D. Prado, E. Carvalho","doi":"10.26850/1678-4618EQJ.V44.3.2019.P20-35","DOIUrl":"https://doi.org/10.26850/1678-4618EQJ.V44.3.2019.P20-35","url":null,"abstract":"To characterize nimesulide raw materials from different manufacturers and to develop immediate release tablets, in order to register a generic product. Also raw material characteristics and the tablets final properties was investigated in order to establish a different specification for quality control. Two micronized and one non-micronized nimesulide samples were obtained from different manufacturers and were characterized by thermal analysis, spectroscopic techniques, morphological analysis, flowability and biopharmaceutical evaluation. The samples belong to the same polymorph. The formulations design and the choice of the production process were carried out based on the results obtained in the characterization assessments. The proposed formulations showed different dissolution behavior. One formulation was selected and then the dissolution was evaluated in different dissolution media containing varying concentrations of surfactant, in order to verify if the concentration of 2% (v/v) of polysorbate 80, recommended by the Brazilian Pharmacopoeia, would be overestimating the bioavailability of the drug. The results showed that the percentage of surfactant present in the dissolution medium directly impacts the amount of dissolved drug. The selected formulation demonstrated promising results to proceed with the biobatches manufacture and the pharmaceutical equivalence study.","PeriodicalId":11506,"journal":{"name":"Eclética Química Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77566320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Diketopiperazines and arylethylamides produced by Schizophyllum commune, an endophytic fungus in Alchornea glandulosa 双酮哌嗪类和芳基乙胺类的产生，裂叶菌是一种内生真菌

Eclética Química Journal Pub Date : 2019-07-21 DOI: 10.26850/1678-4618EQJ.V44.3.2019.P36-42

Carolina Rabal Biasetto, A. Somensi, Fernanda Sales Figueiro, Luiz Alberto Beraldo de Moraes, G. Silva, Maria Claudia Marx Young, V. da Silva Bolzani, Â. Araújo

{"title":"Diketopiperazines and arylethylamides produced by Schizophyllum commune, an endophytic fungus in Alchornea glandulosa","authors":"Carolina Rabal Biasetto, A. Somensi, Fernanda Sales Figueiro, Luiz Alberto Beraldo de Moraes, G. Silva, Maria Claudia Marx Young, V. da Silva Bolzani, Â. Araújo","doi":"10.26850/1678-4618EQJ.V44.3.2019.P36-42","DOIUrl":"https://doi.org/10.26850/1678-4618EQJ.V44.3.2019.P36-42","url":null,"abstract":"Chemical investigation of the crude PDB extract obtained from the endophytic fungus Schizophyllum commune afforded the pure substances, cyclo(L-Pro-L-Val) (1), uracil (2), cyclo(Pro-Tyr) (3), p-hydroxybenzoic acid (4) and a mixture of Rel.cyclo(Pro-Phe) (5) and Rel.cyclo(Pro-Ile) (6). When cultured in corn, the extract of this fungus yielded N-(2-phenylethyl) acetamide (7) and N-(4-hydroxyphenylethyl) acetamide (8). The structures of all compounds were determined based on the analyses of their MS, 1D and 2D-NMR spectroscopic data. Analysis of the crude extracts obtained from small-scale cultures (in PBD, YM, Nutrient, Czapek, Malt Extract, Corn and Rice) and a large-scale culture (in PDB) by mass spectrometry showed the presence of diketopiperazines 1, 3, 5 and 6. The crude extracts showed promising antioxidant, antifungal and acetylcholinesterase (AChE) inhibitory activities. The metabolites 7 and 8 showed antifungal and AChE inhibitory activities in vitro. This is the first report of the identification and isolation of diketopiperazines, arylethylamides, p-hydroxybenzoic acid in endophytic fungus of the Schizophyllum genus.","PeriodicalId":11506,"journal":{"name":"Eclética Química Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82433833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Solution of the Schrödinger equation with inversely quadratic Yukawa potential (IQYP) plus Kratzer-Fues (KFP) potential using the WKB quantum mechanical formalism 用WKB量子力学形式解反二次汤川势(IQYP)加Kratzer-Fues势(KFP) Schrödinger方程

Eclética Química Journal Pub Date : 2019-07-21 DOI: 10.26850/1678-4618EQJ.V44.3.2019.P50-55

B. Ita, H. Louis, N. Nzeata-Ibe

引用次数: 3