College of Science and Technology

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Start date: 2012Has files: Yes

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    Public Private Partnership System Initiation Challenges for the Procurement of Public Infrastructure
    (Covenant Journal of Research in the Built Environment, 2024) Ojelabi, Rapheal; Oyenubi, Adebayo; Afolabi, Baruwa
    This study investigates the severity of the challenges associated with the Public-Private Partnership system initiation phase in the procurement of public infrastructure. Also, strategies for managing the barriers associated with the procurement system were evaluated. The study adopted a quantitative research method, conducting a questionnaire survey targeted at selected PPP stakeholders, which includes Architects, Builders, Structural engineers, estate managers, and Quantity surveyors in Lagos and Abuja. The stakeholders were elicited from selected 19 PPP projects using a project-based approach. The data generated were analysed with SPSS 21 using descriptive and inferential tools. Findings from the study revealed the most severe factors associated with PPP procurement system failure to deliver public infrastructure at the inception phase, including a lack of PPP development fund to promote PPP, corruption among the political class, and investors' perception of the country as high-risk for investment. Likewise, strategies considered significant to managing the PPP initiation barriers were unveiled including establishing policies to facilitate PPP at the inception phase, improving transparency in information sharing and providing guarantee legal framework to protect investors. The findings will grant PPP stakeholders insights to the issues responsible for the termination of PPP project collaboration at initiation phase of the procurement system. Also, the unveiling of the PPP challenges and mitigating strategies at the inception phase could guide stakeholders in developing a framework to a successful PPP implementation in a bid to encouraging more participation at this level.
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    INVESTIGATING FACTORS AND REASONS FOR THE ADOPTION OF GREEN RETROFITTING TECHNOLOGY IN NIGERIA
    (Investigating Factors and Reasons For The Adoption Of Green Retrofitting Technology In Nigeria Vol.12, No1, 2024-10) Ojelabi, Rapheal; Mohammed, T. A.; Tunji-Olayeni, P.; Oladiran, O. J.
    Green retrofitting technology (GRT), which has revolutionized the construction industry of several nations has been poorly implemented in Nigeria. This research investigates issues on the adoption of GRT within the Nigeria built environment. The specific objectives are to examine the factors affecting the adoption of GRT; and find out the reasons for the adoption of GRT. Questionnaires were administered electronically to 100 construction industry professionals in Ekiti State Nigeria, selected via purposive sampling technique. Data were analysed using descriptive statistics tools. The study reveals nine factors affecting adoption of GRT in the research area and shed light that improved building performance is the topmost reason for the adoption of GRT. The study concluded that although there are several factors affecting adoption of GRF, nonetheless, limited knowledge of the technology is topmost among them. It implies that the adoption of the technology could also be limited in scope in the Nigerian construction industry. It is recommended that construction professionals and customers should be holistic in their reasons for the adoption of GRF. This can be done by attaching equal importance to all the reasons for the adoption of GRF.
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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.