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1.
This paper is a rider to the reported high gamma radiation fields around certain ordinary waste sites in Lagos, Nigeria. Exposure groups in the vicinity of these sites are susceptible to radiation risks, among other possibilities of health and environmental hazards, as a result of the waste volumes. Urbanisation requires environment-conscious waste management, especially e-wastes. This study relates Nigeria’s sub-standard waste management to the wider world. There is need for an integrated solid waste management approach. 相似文献
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Bin Zhou Chi Zhang Li Yang Di Bai Emmanuel Oluwatobi Olugbade Gen-zhe Huang 《工业材料与腐蚀》2020,71(3):392-400
The corrosion behaviour of 6082 aluminium alloy was studied by measuring the electrochemical impedance spectra and electrode polarization curves. After the electrochemical tests, a microstructural analysis of the samples was conducted by using optical microscopy and electron scanning microscopy techniques to determine the corrosion mechanism. The results show that the Nyquist plot of the electrochemical impedance data in the NaCl solution consists of high- and low-frequency capacitive impedance loops. When ions are added to the NaCl etchant, the Nyquist plots of the electrochemical impedance data are composed of two different curves: a high-frequency capacitive impedance loop and a low-frequency inductive impedance loop. The corrosion current density increases with increasing concentration, and as a result, the corrosion resistance of the aluminium alloy decreases. The microstructures of 6082 aluminium alloy consist of Mg2Si secondary particles in a large α-Al matrix. Pitting corrosion initially occurs at the boundary between the matrix and secondary particles because the electrode potentials of the matrix and secondary particles are different. Then, corrosion paths develop along the network-like grain boundaries, and finally, massive network-like corrosion occurs throughout the entire alloy. 相似文献
3.
The synthesis of monodispersed, starch-capped ZnSe nanoparticles via a facile, “green” and environmentally benign route at room temperature is being reported. The nanoparticles exhibited strong quantum confinement effect with respect to the bulk ZnSe. The transmission electron microscopy (TEM) image indicated that the particles were well dispersed and spherical in shape. The X-ray diffraction (XRD) analysis showed that the ZnSe nanoparticles were of the wurtzite structure, with average particle diameter of about 3.50 nm. The Fourier transform infrared (FT-IR) spectrum confirmed the presence of starch as passivating agent. 相似文献
4.
Effect of dietary supplementation of tiger nut (Cyperus esculentus l.) and walnut (Tetracarpidium conophorum müll. Arg.) on sexual behavior,hormonal level,and antioxidant status in male rats
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5.
Oluwatobi Ife-Adediran Osagie Isabota 《The International journal of environmental studies》2018,75(5):708-718
Radioactive waste handling and disposal are a major topic in radiation protection. The comparative survey of gamma radiation exposure in the vicinity of some ordinary, general waste dumpsites in this study indicates that they could also pose radiation health hazards. The mean Absorbed Dose Rate (ADR) from all the dumpsites was 309 ± 2.12 nGy h?1. The ADR near the landfills was higher than those of e-waste, metal scraps and municipal solid waste dumpsites. The results also show that the waste dumps contribute to the gamma ADR in their vicinity. ANOVA revealed that ADR at different distances from each of the dumpsites had a statistical variation at the 0.05 significance level. The scavengers and occupants of shanties near the dumpsites receive annual effective doses above the value accepted worldwide average of 0.07 mSv. 相似文献
6.
Bin Zhou Li Yang Shou-Bing Yang Di Bai Oluwatobi Olugbade Gen-Zhe Huang 《工业材料与腐蚀》2020,71(7):1194-1205
Stress corrosion tests of 6082 aluminum alloy were carried out by using a three-point bending fixture while holding at 50% of yield strength state through different immersion times in 1.5% NaCl electrolyte solution. The electrochemical impedance spectra and dynamic electric potential polarization curves were measured to indicate the stress corrosion behavior of the alloy. Optical microscopy, scanning electron microscopy, and X-ray energy spectrum analysis were applied for microstructural investigations. The results show that all of the Nyquist electrochemical impedance spectra consisted of high- and low-frequency double capacitive arcs. However, an increase in immersion time while holding at 50% of yield stress resulted in a corresponding increase in the corrosion current density, leading to gradual corrosion depth growth, and a decrease in the corrosion resistance of the alloy. 6082 Aluminum alloy included AlMnFeSi, Mg2Si, and Si secondary phases. The different secondary phases presented different stress corrosion behaviors. Stress corrosion cracks were generated at the boundaries of AlMnFeSi and matrix or within the AlMnFeSi phase. Crack direction is always perpendicular to the tensile stress applied. Mg2Si secondary phase was self-corroded as its corrosion potential is lower than that of the matrix. As the electric potential of Si is higher than that of the matrix, corrosion occurred at the matrix side of the boundary between Si and matrix. 相似文献
7.
Vuyelwa Ncapayi Neethu Ninan Thabang C. Lebepe Sundararajan Parani Aswathy Ravindran Girija Richard Bright Krasimir Vasilev Rodney Maluleke Ncediwe Tsolekile Tetsuya Kodama Oluwatobi S. Oluwafemi 《International journal of molecular sciences》2021,22(22)
The link between the microbiome and cancer has led researchers to search for a potential probe for intracellular targeting of bacteria and cancer. Herein, we developed near infrared-emitting ternary AgInSe/ZnS quantum dots (QDs) for dual bacterial and cancer imaging. Briefly, water-soluble AgInSe/ZnS QDs were synthesized in a commercial kitchen pressure cooker. The as-synthesized QDs exhibited a spherical shape with a particle diameter of 4.5 ± 0.5 nm, and they were brightly fluorescent with a photoluminescence maximum at 705 nm. The QDs showed low toxicity against mouse mammary carcinoma (FM3A-Luc), mouse colon carcinoma (C26), malignant fibrous histiocytoma-like (KM-Luc/GFP) and prostate cancer cells, a greater number of accumulations in Staphylococcus aureus, and good cellular uptake in prostate cancer cells. This work is an excellent step towards using ternary QDs for diagnostic and guided therapy for prostate cancer. 相似文献
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9.
Michela Palmisano Alessandra Gargano Bolanle Fatimat Olabiyi Beat Lutz Andras Bilkei-Gorzo 《International journal of molecular sciences》2023,24(1)
Endocannabinoid system activity declines with age in the hippocampus, along with the density of the cannabinoid receptor type-1 (CB1). This process might contribute to brain ageing, as previous studies showed that the constitutive deletion of the CB1 receptor in mice leads to early onset of memory deficits and histological signs of ageing in the hippocampus including enhanced pro-inflammatory glial activity and reduced neurogenesis. Here we asked whether the CB1 receptor exerts its activity locally, directly influencing hippocampal ageing or indirectly, accelerating systemic ageing. Thus, we deleted the CB1 receptor site-specifically in the hippocampus of 2-month-old CB1flox/flox mice using stereotaxic injections of rAAV-Cre-Venus viruses and assessed their social recognition memory four months later. Mice with hippocampus-specific deletion of the CB1 receptor displayed a memory impairment, similarly as observed in constitutive knockouts at the same age. We next analysed neuroinflammatory changes in the hippocampus, neuronal density and cell proliferation. Site-specific mutant mice had enhanced glial cell activity, up-regulated levels of TNFα in the hippocampus and decreased cell proliferation, specifically in the subgranular zone of the dentate gyrus. Our data indicate that a local activity of the CB1 receptor in the hippocampus is required to maintain neurogenesis and to prevent neuroinflammation and cognitive decline. 相似文献
10.
Vasudevan Pillai R. Remya Rajendran Jose Varghese Sundararajan Parani El Hadji Mamour Sakho Oluwatobi S. Oluwafemi Sabu Thomas 《应用聚合物科学杂志》2021,138(10):49985
In this work, we have successfully synthesized epoxidized poly(styrene-block-butadiene-block-styrene) with the highest epoxidation degree (55 mol%) for the first time by using metachloroperbenzoic acid method. This highly epoxidized styrene-butadiene-styrene (eSBS) block copolymer exhibited good compatibility with the epoxy (diglycidylether of bisphenol-A)/ eSBS block copolymer- 4,4′-diamino diphenyl methane blend. Transmission electron microscope images showed that the eSBS block copolymer formed spherical nanostructure morphology within the blend due to reaction induced phase separation. The addition of eSBS block copolymer in the system significantly improved the wetting parameters such as hydrophilicity, surface free energy, work of adhesion, spreading coefficient and Girifalco-Good's interaction parameter values, which are discussed in detail. The as-prepared self-assembled nanostructured epoxy system will be useful in highly toughened coating applications such as aircraft, automobile, and flooring industries. 相似文献