Physics for medical students is perceived as a sophisticated subject. The sophistication, however, does not lie in the physics concepts themselves or students’ comprehension of the subject, but it is more often related to the ineffectiveness of techniques applied to teach the subject. This study investigates the effect of the Jigsaw technique, a highly structured form of cooperative learning, on the academic achievement of first-year medical students in learning physics. A quasi-experimental research approach with a pretest-posttest design was employed to conduct the study with a purposive randomly selected sample of fifty students made up of twenty-five students in the control group and twenty-five students in the experimental group. The control group was taught using traditional lectures, while the experimental group was taught using the Jigsaw technique which involved students working actively to map the concepts of nuclear radiation in diagnosis and therapy. A comprehensive statistical analysis, which included a Shapiro’s test, paired sample t-test, independent sample t-test, average gain factor, and size effect calculations, was used to test the research hypotheses. The findings of this study showed that there was a statistically significant difference (P < 0.05) between the post-test scores of students exposed to the Jigsaw cooperative learning technique and those who were not. In addition, it was deduced by the educator (first author) that the students were actively engaged with the topic material, took more responsibility for their performance in the activity, learned how to map the radiation physics concepts, and explored a new learning environment that enabled them to use their higher-order thinking skills to solve medical physics problems.
Heavy metals are not biodegradable and can accumulate in living tissues along the food chain, reaching humans mainly through food. Crabs and other organisms that feed on organic matter in estuarine ecosystem can absorb a greater burden of these toxic elements and thus pose a potential risk to the health of the region's population. Blue crabs collected along three estuaries of the Arabian Gulf. In this work, Measurement of water temperature in ο C , salinity g/l, conductivity in Siemens per meter (S/m), water turbidity in NTU, total hardness g/l, water PH in mg/l and water dissolved oxygen in mg/l were measured by a probe HORIBA ® mod. U-22/Water Quality-Checker [1]. Quantitative studies were carried out on Cu, Zn, Cd, Pb, Cr, Al , Fe, Mn and Ni content in sea water and in the gills of the blue crab Portunus pelagicus (n = 480). Analysis of heavy metals was performed by energy dispersive x-ray fluorescence (EDXRF). Values of salinity g/l, conductivity in Siemens per meter (S/m), water turbidity in NTU, total hardness g/l and water PH in mg/l are within the recommended range CONAMA Resolution No. 357/2005 European Union standards [2], Saudi Arabian Standards [3], WHO [4]. Collected data show that crabs live in Southern Khobar estuary contain
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