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Classroom
In this section of Resonance, we invite readers to pose questions likely to be raised in a classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. "Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science.
Flight Overbooking Problem Use of a Probability Model
Read full article (172 Kb)A Simple, Rapid and Inexpensive Procedure to Distinguish Amino Acids and their Esters
Chromatography is one of the several separation methods based on differential migration. Originally conceived as a method to separate plant pigments, it has undergone numerous modifications each adapted to a particular problem. In adsorption chromatography, pigments extracted from plants are separated into discrete bands each corresponding to a different pigment. In this technique, the plant extract is percolated through a glass tube containing finely powdered calcium carbonate and then washed with light petroleum. The separation of pigments here is due to their differences in affinity for the calcium carbonate, which is acting as an adsorbent (see [1]). Pigments that strongly adsorb migrate more slowly than those adsorbed weakly. Differences in adsorption in this case, result in differences in migration rates. Hence it is possible to collect each pigment separately, if the column is continually washed with the solvent.
Onion Plant as an Educational Tool for Phylogenetic Studies: Molecular Analysis and a New Phylogeny?
The laboratory curriculum of the International Biology Olympiad (IBO) involves activities in different areas of botany and zoology. In addition, every year some other areas, such as biochemistry, genetics, ethology and ecology are also included. The IBO curriculum, both at the theory and practical levels, includes topics at the higher secondary level. However, occasionally certain topics at graduate and postgraduate levels may also be included. This is especially true in the case of molecular biology, biochemistry and genetics. Designing challenging laboratories is an exciting experience for teachers and the rest of us involved in the olympiad preparation.
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