College of Science and Technology

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    Modelling client and construction firm barriers hindering social client relationship management system implementation in the built environment
    (Architectural Engineering and Design Management (Taylor and Francis), 2023-11) Ojelabi, Rapheal; Adedeji, Afolabi; Oyeyipo, Opeyemi; Ogunrinde, Olugbenro
    The need to foster a strong relationship in the construction industry is vital due to the level of dependency among stakeholders in the sector. The social CRM system has been deployed as a relationship tool in most sectors, but its infusion in the construction industry is not resounding. Hence, the study investigates the barriers to Social Client Relationship Management application in fostering sustainable relationships among construction stakeholders. It models the relationships between the associated barriers between the client and the construction organisations affecting the implementation of social CRM systems. A quantitative research approach was adopted, and a face-to-face questionnaire survey was conducted on 200 construction experts selected from 40 construction projects in Lagos Island. The targeted construction experts were elicited for the survey using purposive sampling techniques. Data from the survey were analysed using SPSS 21 data analytics techniques like frequencies and percentages. Also, the study used SmartPLS (v.3.2.3) to develop the structural model. Findings from the study revealed a strong relationship between the significant factors associated with the clients and construction organisation hindering Social CRM system implementation in the built environment. The findings can assist built environment stakeholders in developing strategies to control the factors associated with the client and construction organisation militating against Social CRM implementation in the construction industry.
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    Diagnosing Government Responsibilities in the Implementation of Public-Private Partnership System for Infrastructure Procurement
    (International Journal of Sustainable Development and Planning Vol. 20, No. 6, 2025-06) Ojelabi, Rapheal A.; Oyenubi, Adebayo; Oyeyipo, Opeyemi
    Public-Private Procurement is a system that allows for collaboration between the government and private partners in infrastructure provision. However, researchers argued that the successful implementation of the procurement option rested more on the government's shoulders. Hence, the study aims to identify critical government roles and investigate their importance and performance in PPP projects in Nigeria using a survey approach. The targeted respondents are PPP stakeholders operating in Lagos and Abuja. However, due to the absence of comprehensive lists of the PPP stakeholders involved in PPP projects in Nigeria, a project based approach was used in attaining the representative samples for the study, including contractors, consultants, concessionaires, government agencies, and financiers. About 384 copies of questionnaires were randomly distributed to the sample representatives, and 274 copies were retrieved. The data generated were analyzed using descriptive and inferential statistical tools. Findings showed that all the roles identified are critical and showed significant interrelationships with each other. However, the government's performance in the highlighted roles is unsatisfactory, and recommendations were made on its shortfall.
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    Adoption and Barriers of Engineered Bamboo Products in the Nigerian Construction Industry
    (Civil Engineering and Architecture 13(2), 2025) Ojelabi, Rapheal A.; Omuh, Ignatius O.; Amusan, Lekan M; Ogunrinde, Olugbenro
    The rise in the cost of conventional construction materials and the greenhouse effect from construction activities have been an issue of concern to stakeholders in the construction industry. Hence, efforts have been concentrated on developing low-cost, environmentally friendly and sustainable local materials to mitigate the greenhouse effect. The quest for the sustainable materials necessitates the study to examine the prospects of adoption of engineered bamboo products and the challenges militating against its use among construction professionals. A quantitative approach was adopted and 70 questionnaires were distributed among construction professionals with structural engineering background in selected firms across Lagos State. Data collected were processed using percentage, mean item score and Kruskal Wallis’s test. Facts garnered from the study revealed that engineered bamboo adoption for construction related works like ceiling, flooring, and reinforcement among others is not outstanding. The poor implementation of the engineered bamboo products is attributed to some challenges which include ‘high affinity for conventional materials’, ‘unavailability of bamboo products’ and ‘lack of machinery to refine raw bamboo’ among others. Therefore, the study recommends that stakeholders need to channel more resources into research and development and creating an enabling policy that can enhance the bamboo products adoption.
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    8 - Mitochondrial toxicity of aflatoxin B1
    (ScienceDirect, 2023) Rotimi, Oluwakemi Anuoluwapo; Adelani, Isaacson B.; De Campos, Opeyemi C.; Olawole, Tolulope D.; Rotimi, Solomon O.
    This chapter discusses the toxicity of aflatoxin B1 (AFB1) on mitochondrial function. It starts with an overview of aflatoxins: what they are, where they are found, and the types that exist. The introduction also describes the routes of AFB1 exposure, biotransformation, metabolism, and excretion. Thereafter, the chapter explains the major toxic effects of AFB1 on the mitochondria. First, it discusses how AFB1 disrupts the levels of lipids, particularly cholesterol and phospholipids, which are the major lipid component of the mitochondrial membrane. The changes in the lipids can affect the mitochondrial membrane carriers, thereby affecting membrane transport. Second, it discusses how AFB1 affects the mitochondria membrane potential and permeability. Specifically, AFB1 reduces mitochondrial membrane potential and promotes mitochondrial permeability transition. Third, it discusses how AFB1 induced oxidative stress and apoptosis in mitochondria leading to mitochondrial damage. Lastly, it examines the effects of AFB1 on enzymes of the electron transport chain.
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    Chapter Nine - Early-life AFB1 exposure: DNA methylation and hormone alterations
    (ScienceDirect, 2023) Rotimi, Oluwakemi Anuoluwapo; De Campos, Opeyemi C.; Adelani, Isaacson B.; Olawole, Tolulope D.; Rotimi, Solomon O.
    Aflatoxins are secondary metabolites of mold that contaminate food and feedstuff. They are found in various food including grains, nuts, milk and eggs. Aflatoxin B1 (AFB1) is the most poisonous and commonly found of the various types of aflatoxins. Exposures to AFB1 start early in life viz. in utero, during breastfeeding, and during weaning through the waning foods which are mainly grain based. Several studies have shown that early-life exposures to various contaminants may have various biological effects. In this chapter, we reviewed the effects of early-life AFB1 exposures on changes in hormone and DNA methylation. In utero AFB1 exposure results in alterations in steroid and growth hormones. Specifically, the exposure results in a reduction in testosterone levels later in life. The exposure also affects the methylation of various genes that are significant in growth, immune, inflammation, and signaling pathways.
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    The impact of Bisphenol-A on human reproductive health
    (Elsevier Inc., 2024) Rotimi, Oluwakemi Anuoluwapo; Salami, Esther A.
    Bisphenol-A (BPA) is a recognized endocrine-disrupting chemical used to produce several consumer goods and products. There has been widespread exposure to BPA because of increased industrial production and use of BPA containing products. As a result of these exposures, BPA is found in several human body fluids and can cause endocrine disruption by interfering with hormone signaling pathways and epigenetic modifications. Therefore, human reproductive health and development have been adversely affected by BPA. This review aimed to consolidate existing knowledge on the impact of BPA on human reproductive health, examining its effects on both males and females. To achieve this, we systematically searched four databases for studies that associated BPA with reproductive health (male and female), after which we retrieved the important information from the selected articles. There was an association of reproductive health diseases with high BPA exposure. In males, BPA was associated with increased sperm alterations, altered reproductive hormone levels, and testicular atrophy. In females, there was an association of BPA exposure with hormonal imbalances, reduced ovarian reserve, and increased likelihood of conditions such as fibroids, polycystic ovarian syndrome, endometriosis and infertility. BPA’s pervasive presence and its harmful effects on reproductive health underscore the need for global regulation and public awareness. Although substantial evidence from animal and in vitro studies supports the detrimental effects of BPA, there is a need for more human-focused research, particularly in developing coun tries, to confirm these findings. This review advocates for increased regulatory measures to limit BPA exposure.
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    Disparities in Allostatic Load Among Different Races: A Comprehensive Scoping Review
    (Springer, 2025) Rotimi, Oluwakemi Anuoluwapo; Olowokere, Olanike Gloria; Olasehinde, Olutola Esther; Bisi‑Adeniyi, Titilayo Ifeoluwa; Onyia, Abimbola Fatima; De Campos, Opeyemi Christiana; Rotimi, Solomon Oladapo
    Background Allostatic load measures the cumulative stress, and it varies across populations. Its accurate measurement among racial groups is essential for understanding the effects of chronic stress on health. This review is aimed at investigat ing disparities in allostatic load between races and exploring the underlying mechanisms driving these disparities. Methods A systematic search of literature was conducted, resulting in the inclusion of 296 relevant studies. These studies investigated a wide range of allostatic load biomarkers from the cardiovascular, metabolic, neuroendocrine, and immune systems. They involved diverse racial and ethnic populations with variations in age, gender, socioeconomic status (SES), and stress exposure. Results The review revealed disparities in allostatic load biomarkers across different population groups. The extensive examination of a wide range of biomarkers in the selected studies showed systolic and diastolic blood pressure (DBP), heart rate/pulse rate, high-density lipoprotein cholesterol, glycosylated hemoglobin (HbA1c), body mass index, total cholesterol (TC), C-reactive protein, and interleukin-6 (IL-6)/IL-6 receptor as the most frequently used biomarkers across populations. Socioeconomic status, age, racial discrimination, stressful life events, and adverse health outcomes were associated with allostatic load across different racial groups. Conclusion Disparities exist in previous studies on allostatic load due to differences in biomarker inclusion, calculation methods, study types, and populations studied. In addition, the roles of factors like social determinants of health, discrimi nation, and constitutive factors like genetics and age were discussed.
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    Geoelectrical Variations in Residential Area of Ojongbodu, Oyo, Southwestern Nigeria
    (Nature Environment and Pollution Technology, 2020) Adagunodo, T. A.; Oladejo, O.P.
    This study is aimed at mapping the geoelectrical variations in the residential area of Ojongbodu, Oyo, Nigeria. Thirty vertical electrical sounding stations were occupying across the study area using PZ-02 Earth resistivity meter. Four subsurface layers involving topsoil, two weathered layers and bedrock were mapped, with clay being the most dominating soil type in the third layer, which is about 3.9 m below the first two layers. The thickness of the third layer itself is about 10.4 m. About 70% of the bedrock is fractured. The thickness of clay in the third layer cum fractured bedrock could aid development of differential settlements in buildings or total collapse of structures within the study area.
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    Application of frequency selection and geoelectrical sounding methods for mapping of leachate’s pathways in an active dumpsite
    (Springer Nature Switzerland, 2023) Adagunodo, Theophilus Aanuoluwa; Ojoawo, Ayobami Ismaila; Anie, Nicholas Oliseloke; Edukugho, Praise Oforitsenere
    Contamination of surrounding environments is one of the threats to the proper maintenance of municipal waste sites in developing nations. This study integrates natural electromagnetic (EM) field and geoelectrical sounding methods to assess the leachate’s pathways in the near-surface layers and groundwater system in and around an active dumpsite. Five natural EM traverses were obtained in varying orientations using PQWT-TC 150 model. Fifteen vertical electrical sounding (VES) data points were randomly occupied using SAS 4000 ABEM resistivity meter. The two techniques revealed some intercalations of conductive and resistive media in the study area. The conductive media are composed of mixtures of leachates into clay and groundwater units, thereby creating zones of very low electrical potential differences from the surface to a depth beyond 30 m. A zone of leachate-aquifer’s interphase exists between the third layer and the fourth layer. The directions of the fluid flow are in the S–N and SE–NW trends, which could be linked to the fault towards the northwestern part of the study area. The fluid dynamics, however, justified the reason for the thick conductive materials being mapped at the northwestern and northern parts of the study area.
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    Delineation of structural lineaments of Shaki West Southwestern Nigeria using high resolution aeromagnetic data
    (Nigerian Society of Physics Science, 2025) Adedokun, O. M.; Oladejo, O. P.; Alao, K. N.; Otobrisec, H.; Suleman, K. O.; Adedokun, O.; Sunmonu, L. A.
    A minor earthquake, known as earth tremor, often occurs in areas prone to seismic activity. However, there is a notable gap in knowledge about earth tremors, with little documentation conducted before 1987, but a series of notable events between 1990 and 2000 prompted researchers to delve deeper into the study of earth tremors in Nigeria. Therefore, this study is aimed at delineating the structural lineaments of Shaki West Southwestern Nigeria using High Resolution Aeromagnetic Data (HRAD) to identify the underlying basement geology and define the structural framework of the study area. The study area’s aeromagnetic data of Shaki (Sheet 199) underwent processing and interpretation using Oasis Montaj software to assess basement configuration and structural integrity. The data were further enhanced using the Total Horizontal Derivative (THDR) in order to determine the orientations of the lineaments in the study area. The orientations of the lineaments obtained from THDR map revealed that the Pan African orogeny constitutes 52%; Kibaran orogeny constitutes 31%, while Liberian orogeny constitutes 17% lineaments in the study area. The upward continuation maps suggest the presence of faults at the depth range of 2.0-2.25 km. The overall depth to magnetic sources of the area is relatively shallow compared to sedimentary basement area. Based on orientation of faults on magnetic fault map obtained from the superposition of the lineaments extracted from THDR map on the geological map of the study area, three distinct set of sinistral /dextral faults were recognized in Shaki west local government area which includes: E-W, NE-SW and NW-SE fault trend. This suggests that NE-SW and NE-SE fault-set could be responsible for the tremor experienced in Shaki west southwestern, Nigeria. It is concluded that the study area is not immune from experiencing occurrences of tremors from time to time.