Papers by Oluwatosin Oladipo
Environmental Science and Pollution Research
We investigated the prevalence of antibiotic resistant staphylococci and detection of resistant, ... more We investigated the prevalence of antibiotic resistant staphylococci and detection of resistant, virulence, and Spa genes in a South African wastewater treatment plant. Species identified were Staphylococcus aureus, S. lentus, S. arlettae, S. cohnii, S. haemolyticus, S. nepalensis, S. sciuri (now Mammaliicoccus sciuri), and S. xylosus. Isolates showed high resistance to methicillin (91%), ampicillin (89%), ciprofloxacin (86%), amoxycillin (80%), ceftazidime (74%), and cloxacillin (71%). Multiple antibiotic resistance (MAR) index for the isolates exceeded 0.2 (0.50–0.70). Among the isolates, 77% were mecA-positive. All S. aureus strains were positive for nuc and 7 Spa gene types. The present study highlights possibility of treated wastewaters being potential reservoir for antibiotic-resistant staphylococci. This is a cause for concern as wastewater effluents are decanted into environmental waters and these are, in many cases, used for various purposes including recreation (full conta...
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Bulletin of Environmental Contamination and Toxicology, Mar 13, 2018
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In Nigeria major cities face serious water pollution crises, in which lack of environmental contr... more In Nigeria major cities face serious water pollution crises, in which lack of environmental control of water-dependent activities play an important part. This generates unpleasant implications for health and economic development since most urban and rural areas depend upon lakes and rivers for their water supplies. A study of catfish from Asejire Lake (located at the outskirt of Ibadan, a major city in Oyo State of South-West Nigeria) was carried out to assess the level of contamination due to effluents from various industries in Ibadan, Oyo State particularly the Nigerian Bottling Company, Plc (NBC). The industrial site is located close to the lake and is known to be passing effluent to it. Heavy metals analysis was carried out by the use of an atomic absorption spectrophotometer (AAS) using an air-acetylene flame in the Alpha-4 ChemTech spectrophotometer. The result shows that Fe had the highest concentration (11.9 ppm), this was evidenced by an absorption peak at 406 nm and the h...
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This study examines the factors that drive technology utilisation, learning and transfer among wo... more This study examines the factors that drive technology utilisation, learning and transfer among women farmers in Nigeria. It assesses both modern and indigenous technologies used in farming activities. Three states were purposively selected from the six that comprise the South West geopolitical zone of the country. Structured questionnaire was administered to 180 women smallholder farmers who were randomly selected in equal proportion across the three states. Some 128 copies of questionnaire were retrieved representing a response rate of about 71%. The study reveals that majority of the women (about 67%) use indigenous technologies while only a few (17%) and 16% use modern technologies and a combination of both respectively. Family and friends are the main source of learning indigenous technologies while extension agents are the major source of modern. The study uses spearman correlation to determine the drivers of the dependent variables. Age, level of education, years of experience...
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Applied Soil Ecology, 2021
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Journal of Water and Health, 2019
Multi-drug resistance traits of Staphylococcus species especially methicillin-resistant Staphyloc... more Multi-drug resistance traits of Staphylococcus species especially methicillin-resistant Staphylococcus aureus (MRSA) in the clinical settings are well established. Of environmental concern is hospital effluents discharging into wastewaters. This article investigated the prevalence and detection of antibiotic resistance genes in Staphylococcus species from clinical and environmental sources in Ile-Ife, Nigeria. Standard culture-based and molecular protocols were used. Seventy-six (27 clinical, 14 hospital effluent and 35 environmental) Staphylococcus isolates were recovered: 56.58% were coagulase-negative and 43.42% coagulase-positive (S. aureus). For the clinical isolates, 10, 6, 4, 4 and 1 were isolated from urine, skin, wounds, blood and pus, respectively. Isolates were resistant to methicillin and amoxycillin (91.7%), cloxacillin (88.0%), ciprofloxacin (84.0%), ofloxacin (83.3%), azithromycin (78.0%), ceftazidime (76.0%), gentamycin (75.0%), cefuroxime (75.0%) and erythromycin (7...
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Ecotoxicology, 2018
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Journal of environmental management, Jan 14, 2018
Response and growth kinetics of microbes in contaminated medium are useful indices for the screen... more Response and growth kinetics of microbes in contaminated medium are useful indices for the screening and selection of tolerant species for eco-friendly bio-augmentative remediation of polluted environments. In this study, the heavy metal (HM) tolerance, bioaccumulation and growth kinetics of seven bacterial strains isolated from mining sites to 10 HMs (Cd, Hg, Ni, Al, Cr, Pb, Cu, Fe, Mn and Zn) at varied concentrations (25-600 mgL) were investigated. The isolates were phylogenetically (16S rRNA gene) related to Lysinibacillus macroides, Achromobacter spanius, Bacillus kochii, B. cereus, Klebsiella pneumoniae, Pseudomonas mosselii and P. nitroreducens. Metal tolerance, effects on lag phase duration and growth rates were assessed using the 96-well micro-titre method. Furthermore, metal bioaccumulation and quantities within cells were determined by transmission electron microscopy and electron dispersive x-ray analyses. Tolerance to Ni, Pb, Fe and Mn occurred at highest concentrations ...
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Brazilian Journal of Microbiology, 2017
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South African Journal of Plant and Soil, 2017
Seasonal variations and proximity to polluted sites, among other factors, play a vital role in so... more Seasonal variations and proximity to polluted sites, among other factors, play a vital role in soil composition. The impact of spatio-seasonal changes on bacterial and heavy metal content on and around the platinum mine tailings dam, Rustenburg, South Africa, was assessed. Tailings and topsoils collected during summer and winter were examined for bacterial abundance, physicochemical parameters and metal contents using standard methods. Data were analysed using ANOVA, correlation and cluster analyses. Bacteria counts were 2.5 × 105 to 1.0 × 106 and 3.5 × 105 to 7.8 × 105 CFU g−1 in summer and winter, respectively. Molecular identification revealed the presence of the bacterial species Paenibacillus lautus and Stenotrophomonas maltophilia. Significant (p < 0.05) differences were obtained between chromium (Cr), copper (Cu) and nickel (Ni) concentrations in both seasons but not with bacterial counts. Although higher bacterial abundance was observed on sites 1 and 2 in both seasons. Relative abundance of Ni > Cu > Cr was observed with significantly (p < 0.05) higher concentrations in winter. Pearson's correlation (p < 0.05) and cluster (r = 0.60, p < 0.05) analyses confirmed strong positive correlations between bacteria and Cr, Cu and Ni concentrations. The high bacterial presence on sites in proximity to the dam may indicate metal tolerance of these species.
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Bioremediation Journal, 2016
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Journal of Environmental Management, 2016
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Abstract The effect of organic amendments on microbial activity and remediation of heavy metal co... more Abstract The effect of organic amendments on microbial activity and remediation of heavy metal contaminated soils of three mined sites in Southwestern, Nigeria was assessed in this study. Soil samples (0-15 cm) were collected from Awo, Itagunmodi and Ijero-Ekiti mined sites. Fresh organic wastes of poultry manure (PM) and sawdust (SD) were also collected. The soils, PM and SD samples were separately air dried, sieved and analysed for heavy metal contents such as cadmium (Cd), copper (Cu), lead (Pb), arsenic (As) and iron (Fe) using Atomic Absorption Spectrophotometer. The PM and SD amendments were then incorporated into 100 g and five (5 Kg) of mined soils in ratios 3:1, 2:1 and 1:1 at the rate of 10 g kg-1 and transferred to appropriate containers for laboratory and greenhouse experiments. Carbon dioxide (CO2) evolved in the treated mined soils was measured fortnightly for 16 weeks at 30oC using the double acid titration method as an index for microbial activity. Maize (Zea mays L....
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Abstract Effective management of Municipal Solid Waste (MSW) has posed a critical challenge to na... more Abstract Effective management of Municipal Solid Waste (MSW) has posed a critical challenge to nations especially in developing countries centred in West Africa. Population explosion which characterizes these countries has rather expounded the problem. Wastes generated through man’s domestic, industrial, commercial and agricultural activities are improperly managed and constitute a menace to the environment thus creating a threat to human health. In Nigeria, considerable volumes of wastes are generated at alarming rates due to increased urbanization. These generated wastes are usually indiscriminately littered on streets, road sides or disposed into water bodies and on unapproved dump sites. The resultant effect of this is the reduction in the aesthetic and environmental status of such resources. Drainages are blocked; sewage systems clogged, surface and underground water bodies are polluted while agricultural lands become breeding grounds for rodents, pests and diseases. Nigeria ha...
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African Journal of Science, Technology, Innovation and Development, 2014
ABSTRACT The overall objective of this paper is to develop strategies on how renewable energy tec... more ABSTRACT The overall objective of this paper is to develop strategies on how renewable energy technology could be used to abate climate change impacts in Africa. While assessing the potential impacts of climate change in Africa, the paper asserts that renewable energy is capable of overcoming the challenges of energy access in Africa as a result of the abundance of land, water and feedstocks. It reiterates the fact that the fossil-fuel-dependent industrialisation pathway is not sustainable. The paper develops a model for African countries based on the concept of a latecomer strategy, which could be used to catch up with advanced countries in the manufacturing and diffusion of clean energy technologies. The paper concludes that renewable energy technology is not just another option for the continent but the only option. More importantly, the adoption of the strategy will enable African countries to reduce greenhouse gas emissions and contribute to a cleaner atmosphere in their cities.
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International Journal of Environment, 2014
In the past few decades, concern for the environment has increased significantly with evidences o... more In the past few decades, concern for the environment has increased significantly with evidences of change in perception of…
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Procedia - Social and Behavioral Sciences, 2012
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Papers by Oluwatosin Oladipo