Zusammenfassung: Vorgestelltwirdein Projekt, dasT ablets zumLerngegenstandimChemieunterrichtmacht. Aufbauenda uf einerA ugmented-Reality-Lernumgebungl ernend ie Schülerinnenu nd Schüler überd ie verschiedenen Komponentene ines Ta bletsu nd dieh ierfürw ichtigen chemischen Rohstoffeu nd Te chnologien. DieL ernumgebung kann im Schulunterrichto derD istanzlernen,a bera uchi nV erbindungm it einemB esuch im Schülerlabor genutztwerden.Combiningr eflections on educationf or sustainability andd igitalization -l earningw itha nd aboutt he sustainableuse of tabletsalong an augmentedreality learning environment Abstract: Thearticle describesaproject,inwhich tablets become thefocus of chemistrylearning.Based on an Augmented Realitylearningenvironment,the students learnabout thevarious components of tabletsand the correspondingc hemicalr esources andt echnologies. Thel earning environmentc an be used fors choole ducation or distance learning,b ut also in connection to av isit in an on-formalu niversityl aboratorye nvironment.
The phenomena reported are part of a study about the effects of ionizing radiation on membrane transport. We found that the conductance of lipid membranes in the presence of the polyene-antibiotics nystatin or amphotericin B is reduced to virtually zero following irradiation. Ion channels formed by these substances seem to represent extremely sensitive structures being inactivated by radiation doses in the range of a few Centigray (1 cGy = 1 rad) at sufficiently small dose rates. Inactivation shows a so-called inverse dose-rate behavior, i.e., at constant radiation dose the effect increases with decreasing dose rate. Similar to radiation-induced lipid peroxidation the phenomenon may be understood on the basis of a radical chain mechanism initiated by free radicals of water radiolysis. The process--via peroxidation of the polyene part of the molecules--is suggested to modify the hydrophobic exterior and to destabilize the barrel-like structure of the ion channels.
Das Titelbild zeigt, wie Augmented Reality beim Experimentieren eingesetzt werden kann. Ein mögliches Szenario ist dabei das mechanische Zerlegen von Tabletcomputern, sodass über Recyclingprozesse gelernt werden kann (siehe hierzu Beitrag von Huwer, Barth, Siol und Eilks S. 235 ff).
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