ABSTRACT
Zn is utilized as an anode in alkaline batteries because of its propensity to produce a passive colloidal layer on its surface. Then the surface should be reactivated in the passive region. Therefore, the passive state on the surface can be significantly hindered by utilizing a tiny percentage of Sb alloyed with Zn. Accordingly, the effect of minor Sb alloying with Zn on the performance of anodic dissolution and passivation in concentrated alkaline media (6 M KOH, which is used in the batteries) was studied using potentiodynamic and potentiostatic techniques. Besides, the passive layers formed at various anodic potentials were characterized utilizing scanning electron microscopy (SEM) and X-ray diffraction (XRD). The data of potentiodynamic measurements exhibited the active-passive transition curve of all studied specimens. All obtained results revealed that passivation is gradually hindered with increasing Sb content in the alloy, and less passivity was obtained at 1% Sb. Along this, a dramatic rise in current density at a particular positive potential (+ 2.0 V vs. SCE) to markedly higher values only of the electrodes containing Sb is observed.
ABSTRACT
Health care-associated infections are reported among the top causes of hospital deaths worldwide. Their prevention is a first priority for patient safety in acute care hospitals. Education and training is recommended as a core component for effective infection prevention and control programs. This study aimed to assess the effect of an infection control training course on the knowledge and practices of medical interns in a large academic hospital in Egypt. The study included 268 medical interns who were getting their practical training at Tanta University Hospitals, Egypt during the study period. Knowledge and practices regarding infection control measures were assessed using a predesigned questionnaire sheet and an observational checklist before and after intervention by infection control training course based on Egyptian national guide for infection control. The data have been analyzed through the application of descriptive frequency, percentages, mean of scores, and the inferential analysis that includes paired t test and Monte Carlo test. The level of statistical significance was adopted at p≤0.05. There was a statistically significant (p < 0.0001) increase in total knowledge score (65.4±13.9 versus 80.2 ±13.2) and total practices score (65±11.3 versus 108±7.9) of infection control measures among studied participants before intervention compared with after intervention. A significant strong positive correlation was detected (r= 0.8, p= 0.0001) between total knowledge and practice scores after intervention by training course. There is a strong positive correlation between knowledge and practices so intervention by infection control training course using teaching multimedia and role play significantly improves the knowledge and practice levels of the studied medical interns.
