Search

This work aims to introduce a simple high-performance sensitive electrochemical sensor of reformed carbon paste (CP) with iron oxide nanoparticles (IONs). It was developed to determine one of the most important drugs called vitamin B6 in a medium of phosphate buffer (PBS) over pH ranging from 5.0 to 8.0. The electrochemical and surface characterization was achieved by different techniques comprising electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), differential pulse voltammetry (DPV), and scanning electron microscopy (SEM). The studied effects were, pH, buffer, interference, scan rate, accumulation time, and calibration plot. The sensitive electrode produced a linear calibration curve in a concentration range from 8.88 up to 1000.0 µM, with limits of detection and qualification estimated at 9.06 and 30.2 µM, respectively Also, this method was established in human urine real samples and pharmaceutical drugs which have been shown a good result for vitamin B6 detection. [ABSTRACT FROM AUTHOR]

Cobalt sodium zinc oxide borate glass samples with chemical composition 60 B2O3, 30 ZnO, (10-x) Na2O, x Co3O4, (where x= 0 (S0), 0.1 (S1), 0.2 (S2), 0.3 (S3), 0.4 (S4), 0.5 (S5) mol %). were prepared by conventional melting technique. The impact of CO3O4 on the structure, physical and chemical properties of glass was investigated using XRD, density, UV -- VIS spectroscopy techniques . The density and molar volume were measured by Archimedes method. It turned out that the density and the molar volume increase with increasing cobalt oxide, doping material, content. The study data revealed that the glass samples can be used as optical bandpass filter. It is possible because the optical bandgap energy can be controlled by the doping level. It decreases with the increasing cobalt oxide concentration. DFT quantum theory was used to construct model molecules for studied structure. It allowed to calculate the bandgap energy as function of the doping level and compare it with the experimental determinations [ABSTRACT FROM AUTHOR]

Abstract: This paper presents a study that focuses on evaluating the feasibility of incorporating cement kiln dust (CKD) in the development of controlled low-strength materials (CLSM). A preliminary study (phase [...]

OBJECTIVE: Adolescents from single-parent families are at significantly higher risk of substance use compared to those from mother-father families. More than half of American Indian (AI) children live in single-parent families, the second highest percentage among all groups. Given the paucity of research pertaining to the role of family structure and substance use in the AI population, we sought to examine this relationship. MATERIALS AND METHODS: Data from this study were obtained from the Substance Use Among American Indian Youth: Epidemiology and Etiology, [US], 2015-2020 study. Response variables of interest included age at first substance use, number of substances used, ever-use of substance, and substance use type (i.e., alcohol, cigarette, marijuana, etc.). RESULTS: Living in a father-only or mother-only setting showed a similar pattern of drug use. There was a significant increase in the risk of cigarette, alcohol and marijuana use. For cigarettes, the odds ratio was (OR = 2.60, 95% CI 1.80-3.75) in father-only setting compared to (OR = 1.42, 95% CI 1.13-1.78) for mother only setting. Alcohol use showed (OR = 1.72, 95% CI 1.19-2.50 and OR = 1.40, 95% CI 1.12-1.74) for father-only and mother-only respectively and marijuana use showed (OR = 1.59, 95% CI 1.10-2.30 and OR = 1.54, 95% CI -1.24-1.92) for father-only and mother-only respectively. CONCLUSIONS: Disturbed family structure is associated with increased risk of substance use among AI youth. This indicates the importance and need for policy and community level interventions to reduce youth substance exposure. [ABSTRACT FROM AUTHOR]