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Helseth, L. E. – European Journal of Physics, 2011
We propose a simple and fascinating experiment for studying diffusion in gels using a pH-sensitive dye. By doping agar with methyl red, we obtain a gel which rapidly reacts to changes in pH by changing its absorption spectrum. The pH gradients can be followed using a digital camera, and we demonstrate here that the pH-sensitive colour changes can…
Descriptors: Photography, Chemistry, Experiments, Visual Stimuli
Souza, Karina Ap F. D.; Porto, Paulo Alves – Science & Education, 2012
Assuming that textbooks give literary expression to cultural and ideological values of a nation or group, we propose the analysis of chemistry textbooks used in Brazilian universities throughout the twentieth century. We analyzed iconographic and textual aspects of 31 textbooks which had significant diffusion in the context of Brazilian…
Descriptors: Textbooks, Physics, Chemistry, Science Education
Johnson, Rebecca L.; Dunne, Maxine D. – Journal of Experimental Psychology: Human Perception and Performance, 2012
The current experiments explored the parafoveal processing of transposed-letter (TL) neighbors by using an eye-movement-contingent boundary change paradigm. In Experiment 1 readers received a parafoveal preview of a target word (e.g., "calm") that was either (1) identical to the target word ("calm"), (2) a TL-neighbor ("clam"), or (3) a…
Descriptors: Evidence, Word Recognition, Vocabulary Development, Experiments
Visual Literacy in Biology: A Comparison of Visual Representations in Textbooks and Journal Articles
Rybarczyk, Brian – Journal of College Science Teaching, 2011
Using course materials to promote visual literacy skills is an important aspect of undergraduate science education. A comparison study was undertaken to determine the composition of visual representations, specifically representations of data generated from experimental research, found in general biology and discipline-specific textbooks compared…
Descriptors: Discipline, Textbooks, Biology, Journal Articles
Abante, Maria E. – Journal of Biological Education, 2005
The colourful, vigorous territorial display behaviour of the Siamese fighting fish, "Betta splendens", has great appeal for both pet enthusiasts and animal behaviourists. Their beauty, longevity, easy maintenance and rearing make them a popular pet and an ideal science laboratory specimen. This investigation utilises "B. splendens" to test for the…
Descriptors: Animals, Undergraduate Students, Science Laboratories, Data Analysis