Synthesis and characterization of carbon doped TiO2 photocatalysts supported on stainless steel mesh by sol-gel method

JO. Tijani,OO. Fatoba,TC. Totito,WD. Roos,LF. Petrik 한국탄소학회 2017 Carbon Letters Vol.22 No.-

This study synthesized pure anatase carbon doped TiO2 photocatalysts supported on a stainless steel mesh using a sol-gel solution of 8% polyacrylonitrile (PAN)/dimethylformamide (DMF)/TiCl4. The influence of the pyrolysis temperature and holding time on the morphological characteristics, particle sizes and surface area of the prepared catalyst was investigated. The prepared catalysts were characterized by several analytical methods: high resolution scanning electron microscopy (HRSEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), and X-ray photoelectron spectroscopy (XPS). The XRD patterns showed that the supported TiO2 nanocrystals are typically anatase, polycrystalline and body-centered tetragonal in structure. The EDS and XPS results complemented one another and confirmed the presence of carbon species in or on the TiO2 layer, and the XPS data suggested the substitution of titanium in TiO2 by carbon. Instead of using calcination, PAN pyrolysis was used to control the carbon content, and the mesoporosity was tailored by the applied temperature. The supported TiO2 nanocrystals prepared by pyrolysis at 300, 350, and 400ºC for 3 h on a stainless steel mesh were actual supported carbon doped TiO2 nanocrystals. Thus, PAN/DMF/TiCl4 offers a facile, robust sol-gel related route for preparing supported carbon doped TiO2 nanocomposites.

Zonulin as marker of pregnancy induced hypertension: a case control study

Bawah Ahmed Tijani,Tornyi Henry,Seini Mohammed Mustapha,Ngambire Lincoln Toamsoma,Yeboah Francis Agyemang 대한고혈압학회 2020 Clinical Hypertension Vol.26 No.3

Background: Zonulin has been implicated in many metabolic disorders including hypertension and obesity. However, there is insufficient information about the involvement of zonulin in pregnancy induced hypertension (PIH) which comprises preeclampsia (PE) and gestational hypertension (GH). This study was therefore aimed at finding the level of this biochemical marker of regulation of tight junctions among women with PIH. Methods: A total of 88 women with PIH and 60 age and body mass index (BMI) matched healthy pregnant women controls were enrolled. Blood pressure at 11–13 weeks and after 20 weeks of gestation, body mass index (BMI) in addition to serum Zonulin levels and lipid profile were compared between the groups. Student’s t-test was used for comparisons of the mean between the two groups. Correlation analyses were performed using Pearson’s correlation and binary logistic regression was used to evaluate the factors associated with PIH. Results: Zonulin level was significantly higher in the participants with PIH as compared to the normal pregnant controls 56.81 ± 7.72 ng/ml vs 40.4 ± 8.60 ng/ml p < 0.0001 and had strong positive correlation with PIH (OR = 1.805; CI1.139–1.275; p < 0.0001). However, the association between first trimester lipids and PIH was weak. Conclusion: The results showed a strong positive correlation between zonulin and PIH, thus changes in intestinal permeability occur in early stages of pregnancy and may be involved in the pathogenesis of PIH.

Machine learning techniques for prediction of ultimate strain of FRP-confined concrete

Ibrahim A. Tijani,Abiodun I. Lawal,S. Kwon 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.84 No.1

It is widely known that axially loaded fiber-reinforced polymer (FRP) confined concrete presents significant and enhanced mechanical properties with reference to the unconfined concrete. Therefore, to predict the mechanical behavior of FRP-confined concrete two quantities-peak strength and ultimate strain are required. Despite the significant advances, the determination of the ultimate strain of FRP-confined concrete is one of the most challenging problems to be resolved. This is often attributed to our persistence in desiring the conventional methods as the sole technique to examine this phenomenon and the complex nature of the ultimate strain of FRP-confined concrete. To bridge the research gap, this study adopted two machine learning (ML) techniques-artificial neural network (ANN) and Gaussian process regression (GPR)-to analyze observations obtained from 627 datasets of FRP-confined concrete circular and non-circular sections under axial loading test. Besides, the techniques are also used to predict the ultimate strain of FRP-confined concrete. Seven parameters namely width/diameter of the specimens, corner radius ratio, the strength of concrete, FRP elastic modulus, FRP thickness, FRP tensile rupture strain, and the axial strain of unconfined concrete-are the input parameters used to predict the ultimate strain of FRP-confined concrete. The results of the current study highlight the merit of using AI techniques in structural engineering applications given their extraordinary ability to comprehend multidimensional phenomena of FRP-confined concrete structures with ease, low computational cost, and high performance over the existing empirical models.

Serum adipocytokines and adiposity as predictive indices of preeclampsia

Bawah Ahmed Tijani,Yeboah Francis Agyemang,Nanga Salifu,Alidu Huseini,Ngala Robert A. 대한고혈압학회 2021 Clinical Hypertension Vol.27 No.1

Background: This study was aimed at determining the levels of serum adiponectin, leptin, resistin, visfatin and lipids during the first trimester in pregnant women and to evaluate the relationship between these biochemical markers and preeclampsia (PE). Available evidence point to changes in the levels of these adipokines in PE hence this study examined the potential of using these biomarkers in the prediction of the disease. Methods: This was a case-control study which compared first trimester serum biochemical and anthropometric parameters in pregnant women who subsequently developed PE and those who did not. Blood pressure and urine protein were determined after 20 weeks of gestation and diagnosis of PE performed according to the guidelines of the American Heart Association. Results: There was no significant difference (p > 0.05) in the lipid profile with the exception of HDL cholesterol which was significantly lower (p = 0.043) in the PE group compared to the normotensive group. There were, however, significant differences (p < 0.05) in the adipokines between the PE group and those without PE. Analyses of area under the receiver operating characteristic curves (AUCs) for the adipokines, showed their ability to correctly predict PE even after controlling for body mass index (BMI) and family history of hypertension. Conclusion: Adiponectin, leptin, resistin and visfatin were found to be significant predictors of PE, with resistin being the best predictor after controlling for BMI. However, adiponectin was the best predictor after controlling for BMI, age, parity and family history of diabetes and preeclmapsia.

Photocatalytic degradation of textile wastewater in presence of hydrogen peroxide: Effect of cerium doping titania

Azza Touati,Tijani Hammedi,Wahiba Najjar,Zouhaier Ksibi,Sami Sayadi 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-

Ce–TiO2 catalysts synthesized through sol–gel method were explored for textile wastewaterphotocatalytic degradation in presence of H2O2. Synthesized materials were characterized by X-raydiffraction, Raman spectroscopy, UV–visible diffuse reflectance spectroscopy, N2 physisorption at 77 Kand H2-temperature programmed reduction. Suitable amount of cerium (1%) significantly inhibits theelectron–hole pairs recombination and reduces the energy gap values of the materials. 1% Ce–TiO2catalyst demonstrated superior catalytic performances permitting a 40% and 55% of TOC and colorconversions, respectively. The relationship between photocatalytic activity and physicochemicalproperties was discussed. Environmental impact of textile wastewater was evaluated by thebioluminescence test using the LUMIStox.

Microanatomy, lipid peroxidation and antioxidant system of the visual cortex of rats following withdrawal from prolonged lead nitrate administration

Ahmad A,Tijani,Damilare A,Adekomi,Adedamola A,Fature,Stephen O,Adewole,Adedeji E,Adetunji 대한해부학회 2020 Anatomy & Cell Biology Vol.53 No.1

Exposure to lead (Pb) has been shown to alter the function of central nervous system and affect cholinergic neurons of the visual cortex in animal models. This study sought to investigate the withdrawal symptoms and oxidative stress on the visual cortex after lead exposure. A total of 20 healthy male Wistar rats were randomly divided into two groups (n=10): group A, control, received 10 ml/kg of distilled water for 30 days orally; group B, lead treated group, received 10 mg/kg of lead nitrate solution for 30 days orally. Group B was divided into two subgroups, group B1 serves as non-recovery while B2 serves as recovery (withdrawal). Five rats from each group were sacrificed under ether anesthesia 24 hours after the last oral administration of lead, while the remaining 5 rats (withdrawal subgroup) were sacrificed 30 days after the last oral administration of lead. The visual cortex was grossed from the brain tissue and processed for histology. Blood/serum samples were obtained and markers of oxidative stress (superoxide dismutase [SOD], catalase [CAT], glutathione peroxidase [GPX]), and lipid peroxidation (malondialdehyde [MDA]) were analyzed. Lead-exposed rats display a significant reduction in the SOD, CAT, and GPX level as well as increased in MDA level. However, following a recovery period, a non-significant improvement was seen in the histoarchitecture of the visual cortex.

Yield Sustainability and Phosphorus Utilization in Sole Soybean Cropping on Alfisols in Response to Interactive Effects of Fertilizer Nitrogen and Phosphorus

Vincent Aduramigba-Modupe,Hassan Tijani-Eniola 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Morphine-alcohol treatment impairs cognitive functions and increases neuro-inflammatory responses in the medial prefrontal cortex of juvenile male rats

Adekomi Damilare Adedayo,Adegoke Adebiyi Aderinola,Tijani Ahmad Adekilekun,Olaniyan Olayinka Olaolu,Alabi Mutiyat Olanike,Ijomone Kafilat Olayemi 대한해부학회 2018 Anatomy & Cell Biology Vol.51 No.1

In the developed and developing world, opioid consumption in combination with alcohol has become one of the substances abused. In this experiment, we examined the effects of alcohol, morphine, and morphine+alcohol combination on cognitive functions and neuroinflammatory responses in the medial prefrontal cortex (mPFC) of juvenile male rats. Alcohol (1.0 ml of 15% v/v ethanol twice daily, subcutaneously, 7 hours apart), morphine (0.5 ml/kg of 0.4 mg/kg morphine chlorate twice daily, subcutaneously, 7 hours apart), morphine+alcohol co-treatment (0.5 ml/kg of 0.4 mg/kg morphine chlorate+1.0 ml of 15% v/v ethanol twice daily, subcutaneously, 7 hours apart) were administered for 21 days. Treatment with morphine+alcohol significantly impairs cognition functions in the Morris water maze, passive avoidance, and novel object recognition tests, furthermore, the treatment significantly increased the quantitative count of astrocytic cells and also conferred marked neuronal cell death in the mPFC, which were studied by glial fibrillary acidic protein immunochemistry for astrocytes and Cresyl violet for Nissl’s substance distribution in neurons respectively. These results suggest that alcohol, morphine, and morphine+alcohol co-treatment may trigger cognitive deficits and neuroinflammatory responses in the brain.

Inflence of Agricultural Land on Organic Carbon Distribution in Soil Aggregates Fractions in Ile-Ife, Southwestern Nigeria

Durodoluwa Oyedele,Roberto Pini,Enzo Sparvolli,Oladapo Tijani,Manuele Scatena 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

The Association between Dietary Antioxidant Quality Score and Cardiorespiratory Fitness in Iranian Adults: a Cross-Sectional Study

( Hossein Shahinfar ),( Mahshid Shahavandi ),( Aliyu Tijani Jibril ),( Kurosh Djafarian ),( Cain C. T. Clark ),( Sakineh Shab-bidar ) 한국임상영양학회 2020 Clinical Nutrition Research Vol.9 No.3

The association between dietary antioxidant quality score (DAQS) and cardiovascular risk factors such as low cardiovascular fitness (CRF) and elevated blood pressure (BP) has rarely been investigated. To investigate the association between DAQS, CRF, and BP. This cross-sectional study was conducted on 270 adult subjects living in Tehran, Iran. Dietary intake was evaluated using a validated food frequency questionnaire. The DAQS was calculated using antioxidant-nutrient intake. Socio-economic status, anthropometric measures, and BP were recorded by a trained interviewer, using standard methods. A significant increase was found in maximal oxygen uptake (p value = 0.01) across tertiles of DAQS. After adjusting for confounders, the association remained unchanged (p value = 0.02). Participants in the highest tertile of DAQS had higher systolic BP (SBP) (p value = 0.01) and diastolic BP (DBP) (p value = 0.03), although adjustment for confounding factors attenuated the results (p value = 0.3 for DBP and p value = 0.6 for SBP). Our results revealed that higher DAQS is associated with better CRF in Iranian adults. Further studies are needed to establish the veracity of our results.