Yemisi Obafemi

Covenant University Ota Ogun State

Radiation facilities are placed in an enclosed environment to prevent scattered radiation from getting out of the room, by so doing the rooms foil gas exchange from the outdoor environment, thereby increasing the radon concentration in the indoor air. This study aimed at estimating the occupational radon exposure level in medical facility room in o...

The indigenous Nigerian fermented agrifoods are local foods derived from agricultural raw materials, including maize, cassava, millet, sorghum, yam, and nuts. The fermentation of the agrifood products initiates the processing of indigenous Nigerian fermented foods such as the Ogi (Pap), Abacha (African Salad), Burukutu (Beer), Dawadawa (Condiment),...

Vaginal infections are common female disease conditions that account for the prevalence of gynecological disorders which facilitate the increasing antimicrobial resistance and failure of prevalent treatment choices. In this study, the antibacterial activity of cell free supernatants (CFS) of probiotic Lactobacillus obtained from ogi (fermented maiz...

Reproductive dysfunctions in several fish species have been linked to eutrophication due to the presence of cyanobacteria which contain biotoxins known as microcystins. In this study, microcystin-LR (MC-LR) from microcystins cells was isolated from water samples of Eleyele and Iju rivers, as well as two Clarias gariepinus fish ponds (Pond A was fed...

Mycotoxins are toxic secondary metabolites produced by fungi in foods and feeds. Over 400 mycotoxins have been described in the literature including aflatoxins (Afs), fumonisins (FBs), ochratoxins (OTAs), citrinin (CIT), zearalenone (ZEN), trichothecenes (TCs), and patulin (PAT). These mycotoxins are produced by species of Aspergillus, Fusarium, Pe...

Assessing morphometrics and trace metal bioaccumulation in fishes helps determine water pollution and any potential harm that may result, both on the species population and the consumer. This study aimed to compare the gastrointestinal morphology, trophic status and bioaccumulation susceptibilities of Clarias gariepinus from wild and captive source...

Investigating the interplay of factors that result in a viral zoonotic outbreak is difficult, though it is increasingly important. As anthropogenic influences shift the delicate balance of ecosystems, new zoonoses emerge in humans. Sub-Saharan Africa is a notable hotspot for zoonotic disease due to abundant competent mammalian reservoir hosts. Furt...

Nutrition plays a very important role in the health promotion of individuals and brought about a global paradigm shift from pharmaceuticals to nutraceuticals. This is due to the high cost, non-availability, and side effects associated with the unregulated consumption of pharmaceuticals. Over the ages, nutraceuticals from food products were reported...

Geospatial spread and antibiotic resistant relatedness of Escherichia coli O157, which are important virulent serotypes causing severe complications leading to high intestinal morbidity and occasional mortality in several communities in southwest Nigeria, were evaluated. Biotyped Escherichia coli strains (n = 508) from subjects with diarrhea and re...

Backgrounds Observable emergence of Vancomycin-Non susceptible Coagulase-negative Staphylococci (VNS-CoNS) associated with skin and soft tissue infections spreading among the urban and rural populace is gradually intensifying severe complications. The isolated VNS-CoNS were evaluated with Matrix-assisted Laser Desorption/ionization Time of Flight M...

BACKGROUND: Plant-based naturally fermented condiments usually result in poor quality products with various bacteria and fungi contaminants. Previous reports suggested the use of starter cultures from previously fermented condiments in fermentation processes to ensure health-promoting benefits, improved quality, shelf life, and organoleptic propert...

Abstract Background The antibacterial activities of aqueous leaf extracts of Moringa oleifera, Vernonia amygdalina, Azadirachta indica and Acalypha wilkesiana against multidrug resistance (MDR) Staphylococcus aureus associated with skin and soft tissue infections were investigated. Methods Staphylococcus aureus (n = 183) from the skin and soft tiss...

Traditional fermented foods are of major importance with respect to the socio-economic growth, food security, nutrition, and health of African consumers. In several African countries, traditional fermentation processes provide a means of food preservation, improving the shelf life and adding to the nutrients in the food products. As with any fermen...

Locally produced plant-based fermented condiments serving as daily dietary protein in Nigeria tend to have poor safety and shelf-life quality. This study evaluates the fermentation, preservation, and shelf-life quality of probiotic lactobacilli fermented Nigerian condiments. Three fermented condiments [Locust beans “Iru” or “Dawadawa” (Parkia biglo...

Lignocellulosic wastes have capacity to substitute fossil fuels as sustainable sources of renewable energy, with added advantage over environmental and health challenges. This research was aimed at producing biogas from anaerobic co-digestion of thermo-alkaline pretreated corn stover with cattle rumen content. The thermal and alkaline pretreatment...

Uncontrolled use of antibiotics has resulted in the emergence of resistant bacteria. It has necessitated the evaluation of antibacterial activities and phylo-diversity of Aloe vera (also called Aloe barbadensis) plants as antimicrobial agent in Nigeria. Biotyped enteric bacilli of 251 strains obtained from fecal samples of patients with various gas...

Diet plays an essential role in human development and growth, contributing to health and well-being. The socio-economic values, cultural perspectives, and dietary formulation in sub-Saharan Africa can influence gut health and disease prevention. The vast microbial ecosystems in the human gut frequently interrelate to maintain a healthy, well-coordi...

BACKGROUND: Tomatoes (Lycopersicon esculentum Mill.) have very huge health-promoting benefits due to high nutritional composition; however, these fruits are potential reservoir of enteric food-borne pathogens causing major public health concerns. AIM: Characterization and phylo-analysis of implicated enteric bacteria strains in retailed Tomato frui...

Spread of genetically diverse Staphylococcus aureus characterized with multi-antibiotic resistance and regulated by high level agr functionalities in several communities in southwest Nigeria was investigated and evaluated for infection control. Staphylococcus aureus pathotypes recovered from 256 cases including purulent pus from skin infections, so...

Background and Objective: Milk agar is recommended for enumeration of microorganisms in dairy products. Most of the commonly used media are imported to Nigeria and hence available in-house substitutes are necessary. In this study, microbial growth enhancement values of compounded milk agar were compared to imported milk agar using two milk brands....

Background: The ongoing SARSCoV-2 pandemic was introduced into Africa on 14th February 2020 and has rapidly spread across the continent causing severe public health crisis and mortality. We investigated the genetic diversity and evolution of this virus during the early outbreak months between 14th February to 24th April 2020, using whole genome seq...

Cereals such as maize are generally having low essential amino acid contents which may cause protein malnutrition. The high essential amino acid in African breadfruit could make it suitable for supplementation of grains/cereals. The microbiological, sensory and nutritional evaluation of cofermented maize (70%) /African breadfruit seed (30%) was car...

The microbial population within working environments contribute greatly to employee efficiency and health. This study was carried out to investigate the distribution of microorganisms in indoor spaces of key administrative buildings within Covenant University. Microbial species from indoor air and surfaces of six administrative buildings were isola...

Focal dissemination of multi-antibiotic resistant (MAR) Staphylococci pathotypes regulated by agr functionalities was investigated and evaluated for infection control. Non-repetitive Staphylococcus aureus strains from soft and skin infections disseminated in several communities were recovered and biotyped, assayed for biofilm and profiled for antib...

The aim of the study was to comparatively analyze the interrelationships among iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), lead (Pb), cadmium (Cd), chromium (Cr) and total hydrocarbons (THCs) in the gills, intestines and muscles of Clarias gariepinus collected from Osse River, Nigeria, between the periods of April, 2013 to September, 2014. T...

This research was to investigate the chemical composition, antioxidant activity, and microbial profiles of Cola lepidota fruits. One hundred grams each of the fruit exocarp, mesocarp and endocarp were blended and analyses were carried out by the following standard methods. Active acidity and vitamin C contents were 5.5 and 6.34 mg 100 g<sup>–1</sup...

Dermatophytosis is a superficial fungal infection of hair and keratinized layers of the epidermis and is caused by keratinophilic and keratinolytic genera such as Microsporum, Trichophyton and Epidermophyton. The animal age and trauma are important predisposing factors of disease. Show lambs are more susceptible to ringworm. T. verrucosum has been...

Commonly used methods for determination of antibacterial potency of honey are usually the disc, agar well diffusion and dilution plate assay which had shown various demerit of inaccuracies and impreciseness. Therefore, the suitability of spectrophotometric assay for determination of honey inhibitory activity is evaluated in this study. Honeys from...

The anaerobic digestion process for biogas production was investigated on food waste (FW) and cow dung (CD) using Pseudomonas aeruginosa as inoculum. The food waste and cow dung were co-digested as the substrate with bacteria ( P. aeruginosa ). Five digesters were prepared to observe the maximum gas production potential, methane production rate and...

Background Polygalacturonase (EC 3.2.1.15) enzyme aids in microbial spoilage of fruits and vegetables. It is very important to find economical ways to producing the enzyme so as to achieve maximum yield in industries due to its use at different areas of production process. Methods Isolation of polygalacturonase-producing bacterial strain from toma...

The study explored, examined and simulated some selected abiotic factors observed at biodiversity hotspots of Osse River, located in the tropical Rainforest, Edo State, Nigeria. The study was aimed at providing information required for sustainable shrimp husbandry. The research rationale was that the stress levels in shrimps are absolutely a functi...

Wild edible mushrooms have been reported to contain high phenolic contents which confer free radical scavenging ability. This study investigated antioxidant potentials of wild edible mushrooms from the Ashanti region (Kumasi) in Ghana. Cultivated strain of Pleurotus ostreatus (control) and five wild edible mushrooms (Termitomyces sp., Volvariella s...

Antimicrobial activities of some Nigeria honeys were tested on multi-antibiotic resistant enteric bacilli strains (MAREBS) that are becoming dreadful among the populace. Enteric bacilli isolated from fecal samples randomly collected from community populace were biotyped and profiled for antibiotic susceptibility by micro-broth dilution assay. Honey...

Ten authorized Yogurt products purchased within Ota metropolis, Ogun State of Nigeria were subjected to pH, Total Bacterial Count (TBC) and Total Fungal Count (TFC) analysis. pH values were in the range of 4.05 to 5.50, the TBC and TFC values ranged between 1.0 x 103 - 5.0 x 105 cfu/ml and 1.0 x 103 - 5.0 x 105 cfu/ml respectively. Eleven bacterial...

Purpose Increasing rates of clonal spread of fecal blaTEM bacilli remains a huge concern to the community health with resultant high morbidity. The fecal carriage and clonal diversity of blaTEM within the communities in Southwest Nigeria were surveyed. Materials and methods Enteric bacilli obtained from fresh fecal samples randomly collected from...

Dietary intake of polycyclic aromatic hydrocarbons (PAH) and heterocyclic amines (HCA) has posted a great health risk as they have been identified as a most potent human carcinogen. Microbial quality of food is also of concern as they contribute to food poisoning and infection. Sixty food samples comprising roasted yam, plantain, grilled and smoked...

Pollution from petroleum products is of public health concern because of its attendant health and environmental impacts. Biodegradation of Bonny light crude petroleum and other selected hydrocarbons by bacteria isolated from soils of three different mechanic workshops in Ota, Ogun State were studied. Species of bacteria were isolated by the enrichm...

Pollution from petroleum products is of public health concern because of its attendant health and environmental impacts. Aims: To study the biodegradation of Bonny light crude petroleum by bacteria isolated from soils of three different automobile mechanic workshops in Ota, Ogun State. Study Design: Contaminated soils from three (3) different auto-...

Aim: The study was aimed at comparing the levels of heavy metals in Tiger shrimps- Penaeus monodon from different source categories, to ascertain the impacts of the selected heavy metals on the consumers’ health. Hypothesis: Heavy metals in blood serum of shrimp consumers were accumulated solely from the shrimps. Methodology: Tiger shrimps obtained...

Amylases (EC 3.2.1.1) are cellwall degrading enzymes associated with the pathogenicity of microorganisms in the spoilage of tomato fruits. The use of amylase in many industries has made it very important to optimize production process to achieve maximum yields. Screening and partial purification of Amylase from Aspergillus niger isolated from tomat...

This research work has established the fact that the fresh tomato fruits serves as host to a number of bacteria and fungi which could only cause spoilage when the cell wall is damaged. The tomato post harvest storage system kept the tomato fresh and intact for the period of the 14- day research This storage system will be useful for maintaining pos...

This paper investigates the effects of Dialium guineense based zinc nanoparticle material on the inhibition of microbes inducing microbiologically influenced corrosion (MIC) in metals. Extract of leaf from the natural plant were used as precursor for zinc nanoparticle material, which was characterized by scanning electron microscopy and energy disp...

Water from a borehole was collected into tap-fitted plastic buckets of different colours. A set of the buckets were stored indoor while duplicate were stored outdoor. The atmospheric conditions as indicated by sky condition, relative humidity, total radiation and aerosol optical depth were monitored during the storage period. The effects of colour...