Ife Journal of Science最新文献

{"title":"Detection and characterization of Listeria monocytogenes from locally processed fermented foods in Ethiope West, Delta State, Nigeria","authors":"A. Beshiru, K. E. Uwhuba","doi":"10.4314/ijs.v25i3.12","DOIUrl":"https://doi.org/10.4314/ijs.v25i3.12","url":null,"abstract":"Outbreaks linked with foodborne pathogens and associated diseases occur regularly and pose substantial health problems to consumer safety globally. Listeriosis is a leading foodborne disease initiated by the consumption of foods contaminated by Listeria monocytogenes (L. monocytogenes ) This study evaluated the presence of . L. monocytogenes in various food samples. Locally fermented food samples (n = 80), which included Garri (n = 30), Kunu (n = 25), and Zobo (n = 25), were obtained from five open local markets in Ethiope West, Delta State, Nigeria. Food samples were screened for L. monocytogenes  using standard cultural techniques, biochemical tests including the Analytic Profile Index (API) Listeria  kit. The isolates were screened for antimicrobial resistance using the disc diffusion method, and breakpoints were interpreted based on the guidelines of the Clinical Laboratory Standard Institute. Gelatinase and lipase activities, including β-haemolysis, were determined using standard methods. L. monocytogenes was identified in 3 (3.8%) and 4 (5%) samples from Zobo and Kunu, respectively. The Garri samples were negative for L. monocytogenes, and only 7 of the 80 (8.8%) samples were positive for L. monocytogenes.  One positive sample each was obtained in the Oghara and Ogharefe markets, two from the Ugbenu market, and three from the Mosogar market. No sample was positive L. monocytogenes. for in the Oghareki market. All the isolates were penicillin-resistant but susceptible to levofloxacin and tetracycline, whereas five were resistant to clindamycin. All isolates were resistant to at least two classes of antibiotics, and the multiple antibiotic resistance (MAR) index was ≥ 0.22. Gelatinase activity was observed in one isolate, β-haemolytic activity in four isolates, and lipase activity in five isolates. This study revealed the importance of proper hygiene practices in food production and continuous surveillance of antibiotic resistance and virulence determinants in food. There is a need to adhere to standard hygiene measures in food processing environments. ","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139448743","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}

{"title":"Evaluation of trace elements in the sediments of intertidal zone around Mahin-Ugbo Area, southwestern Nigeria","authors":"I. Asowata, O. A. Bamisaiye, J. Akinwale","doi":"10.4314/ijs.v25i2.5","DOIUrl":"https://doi.org/10.4314/ijs.v25i2.5","url":null,"abstract":"This study assessed the spatial distribution of Trace Elements (TE) in the muddy sediments of the Mahin-Ugbo coastal area of  Southwestern Nigeria, using Inductively Coupled Plasma-mass spectrometry, (ICP-MS). The physicochemical parameters (pH, EC and  TDS) of the sediments were also determined. Results showed that the mean values for pH, E.C and TDS were 5.09, 153.6 μs/cm and 76.8  mg/L, respectively. Further, there was a varying distribution pattern of TE concentrations: Mn> Zn > Ba > Cr > V > Sr > Pb > La > Cu > Ni >  Co > As > Th > Sc > Ga. The As, Pb, and Zn concentrations in the sediment with mean values of 11.2, 40.4 and 122.1 ppm, respectively, were  significantly higher than the average concentrations of As (10 ppm), Pb (20 ppm) and Zn (90 ppm) in natural shale, suggesting  anthropogenic TE enrichment in the study area. To corroborate this, the TE source apportionments in the sediments using correlation  coefficient, bi-variant plots and principal component analyses showed that the TE enrichment may have been anthropogenically induced.  Pollution status assessments using I-geo, contamination factors and pollution load index indicated that the study area's sediments is  slightly to moderately polluted. These findings suggest that although the area is not heavily polluted, increasing human activities, from  inland rivers to the coastal area, in the study area will in no time be a cause for concern. ","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91076530","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}

{"title":"Geochemical elements as provenance and paleoenvironmental indicators in siliciclastic sediments of Neogene Gwandu formation exposed in Birnin Kebbi Area, Northwestern Nigeria","authors":"O. A. Phillips, A. J. Adebayo, Y. Abdulganiyu, K. A. Apanpa","doi":"10.4314/ijs.v25i2.3","DOIUrl":"https://doi.org/10.4314/ijs.v25i2.3","url":null,"abstract":"No Abstract","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89784437","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}

{"title":"Estimation of ground depth of radioelements sources in Ogun State, Southwestern Nigeria using gradient techniques","authors":"F. O. Ogunsanwo, O. T. Olurin, J. D. Ayanda, S. A. Ganiyu, A. O. Mustapha","doi":"10.4314/ijs.v25i2.10","DOIUrl":"https://doi.org/10.4314/ijs.v25i2.10","url":null,"abstract":"Radioelement exploration has gained economic interest recently due to its usefulness in the detection and delineation of mineral  deposits. In this study, the airborne radiometric data were analysed for depth estimation of the radioelement deposit in Ogun state,  Nigeria. Three enhancement gradient techniques, namely; Analytical Signal Amplitude (ASA), Horizontal Gradient Magnitude (HGM) and  Local Wave Number (LWN) were employed to estimate the possible depth of radioelements for mineralization. Geosoft's (Oasis Montaj)  software and Potential Field's (PF) software were used to conduct the estimations. The result obtained revealed shallow sources of 0.584  km (LWN) and 0.387 km (ASA), and deep-seated sources of 5.950 km (ASA) and 5.880 km (ASA) for uranium and thorium, respectively. The  shallow source and deep source for potassium are 0.259 km (ASA) and 2.540 km (ASA), respectively. In this study, the position and  depth of the source were automatically estimated using linear equations based on derivatives without the use of any a priori knowledge.  The three gradient methods are therefore found suitable in estimating the depth to radioelement anomalous source. ","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73214972","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}

{"title":"Dye-Sensitized Solar Cells (DSSCS): The History and a new optical activity-based method to predict the power conversion efficiency","authors":"K. Sanusi","doi":"10.4314/ijs.v25i2.2","DOIUrl":"https://doi.org/10.4314/ijs.v25i2.2","url":null,"abstract":"Improvement on the performance of dye-sensitized solar cells (DSSCs) has been a major research topic for the past thirty years. Several  research efforts on increasing the efficiency of DSSC have mainly focused on the synthesis of novel sensitizers, with the continuous  employment of the traditional mesoporous TiO films as 2 - - semiconductor, and the iodide/triiodide (I /I ) electrolyte as redox couple.  Since not so much have been done in 3 - - exploring other mesoporous semiconductors and redox electrolytes beyond these two, TiO and  I /I couple, 2 3 this paper concisely chronicles the power conversion efficiencies (PCEs) of DSSCs of different dye sensitizers, where  only TiO nanofilm and iodide/triiodide redox couple have been used as the semiconductor and 2 electrolyte systems respectively. This list  was used to obtain possible relationship between the optical properties of dyes and the PCE of the DSSC. Dye sensitizers with PCE  values > 1.00% were employed. The spectral properties of each of the selected sensitizers were used to obtain their spectrum power, I(l).  An increase in PCE value as I(l) increases was observed for 81.25% of the sixteen sensitizers considered, which suggests that a direct  correlation could exist between the I(l) of a sensitizer and the PCE of the DSSC of that sensitizer. ","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79891676","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}

{"title":"Petrochemistry of Charnockitic Rocks of Awo-Osuntedo Area, southwestern Nigeria","authors":"A. Adetunji","doi":"10.4314/ijs.v25i2.1","DOIUrl":"https://doi.org/10.4314/ijs.v25i2.1","url":null,"abstract":"The petrochemistry of charnockitic rocks from the Awo-Osuntedo area of southwestern Nigeria were investigated with the objectives of  presenting their petrogenesis and geotectonic setting at the time of their emplacement. The rocks were mainly found within the  migmatitic gneiss country rock and associated pegmatites. They occurred as small intrusive bodies and are composed mainly of  orthopyroxene, clinopyroxene, quartz, biotite, secondary amphibole, plagioclase and alkaline feldspars with a small compositional range between basic and intermediate respectively for Awo and Osuntedo rocks. The small Eu* anomalies (0.9-1.47) with an average of 1.2  combined with elemental signatures indicate that the rocks were derived from an enriched mantle with some crustal contamination and  emplaced in an environment similar to the arc region of tectonic setting. Though, the rocks have dry mineral assemblages, there is no  geochemical evidence to suggest they were derived from melting that was associated with granulite facies metamorphism rather the  small sizes of the plutons and the geochemical signatures particularly high magnesian and calc-alkaline nature are typical of the Caledonian type charnockite formed during delamination of thickened continental crust after collisional orogeny.  ","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73598776","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}

{"title":"Revised stratigraphic sequence and type sections of the Southern Bida Basin, Nigeria","authors":"G. U. Ozulu, G. Aigbadon, A. Okoro, N. Odiaka","doi":"10.4314/ijs.v25i2.7","DOIUrl":"https://doi.org/10.4314/ijs.v25i2.7","url":null,"abstract":"A reassessment of the stratigraphy of the Southern Bida Basin has been attempted among various disagreements. For this work, field  geological mapping and stratigraphic descriptions of exposed lithologic types on outcrop sections were used. Section-by-section  descriptions of important outcrops based on field observations aided in identifying lithologic units and delineating the boundaries of the  sub-basin's three formations (Lokoja, Ahoko, and Agbaja). The type sections for formations in the sub-basin were not properly erected, so  Jones (1958) type section has been supplemented by a more comprehensive hypostratotype, and the name Patti Formation, which is  considered a misnomer in this context, has been replaced with Ahoko Formation proposed by Rahaman et al. (2019). Ahoko village is the  type locality. The Agbaja Plateau, where the Agbaja Formation is best exposed, has been presented as the lectostratotype for the  formation, while the revised stratigraphic succession of the Lokoja region shows the Lokoja Formation directly encompassing the  Paleozoic Basement terrain, with the Maastrichtian Agbaja and Ahoko Formations (former Patti) overlying it sequentially.","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85905759","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}

{"title":"Hydrocarbon detection and depositional environment prognosis in the Niger Delta - Integrated insights from log and seismic avo-inversion attributes","authors":"D. Falebita, O. Akintokewa","doi":"10.4314/ijs.v25i2.9","DOIUrl":"https://doi.org/10.4314/ijs.v25i2.9","url":null,"abstract":"This study demonstrates the effectiveness of integrated seismic analysis and petrophysically constrained AVOinversion for reservoir  evaluation and assessment of hydrocarbon potential and depositional environment in the Niger Delta. It is aimed at improved prediction  of reservoir fluid, lithology, and ultimately the hydrocarbon prospects, with reduced uncertainties. The results delineate the  characteristics of the reservoir sands, highlight major facies heterogeneities, unravel prolific stratigraphic features (such as channels, fan  lobes), depositional fairways and provide insight into the mapped geology. These are expected to consequently reduce the uncertainties  associated with the prospects for economic decision making.","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75061272","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}

{"title":"Synthesis, characterization and in-silico studies of (e)-4-[(4,5- dimethylthiazol-2-yl)diazenyl]-2-isopropyl-5-methylphenol and its coordination compounds","authors":"T. Aiyelabola, I. Olawuni","doi":"10.4314/ijs.v25i2.8","DOIUrl":"https://doi.org/10.4314/ijs.v25i2.8","url":null,"abstract":"An azo dye, (E)-4-((4,5-dimethylthiazol-2-yl)diazenyl)-2-isopropyl-5-methylphenol (L1), was prepared by the reaction of 5-methyl- 2-(propan-2-yl)phenol with the diazonium salt of 2-amino-4,5-dimethylthiazole. Characterization was carried out using proton and  carbon-13 nuclear magnetic resonance spectroscopy. Coordination compounds of L1 with Mn(III), Fe(III) and Co(III) in a 1:2 metal to  ligand mole ratio were subsequently synthesized. Corresponding mixed ligand complexes were also synthesized using 2- hydroxybenzoic  acid (L2) as the secondary ligand. The coordination compounds were characterized by electronic and infrared spectrophotoscopy,  magnetic susceptibility measurements, and percent metal composition. Subsequently, in silicostudies were performed based on the  proposed structures of the synthesized compounds to determine their binding affinity and binding site with calf thymus DNA. The results  obtained showed that all complexes achieved octahedral geometry. The results also showed that some of the compounds had better  affinity for CT-DNA than the standard.  ","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75678824","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}

{"title":"Analysis of elastic scattering cross sections of 16”O 27ON” Al and 154Sm using the semi-microscopic double folding model","authors":"S. Olorunfunmi, A. Olatinwo","doi":"10.4314/ijs.v25i2.4","DOIUrl":"https://doi.org/10.4314/ijs.v25i2.4","url":null,"abstract":"No Abstract","PeriodicalId":13487,"journal":{"name":"Ife Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76418417","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}