Search results for "allosteric model"
showing 2 items of 2 documents
Evolution of scientific conceptions and knowledge among gymnasium pupils
2014
International audience; Two major models investigate the relationship between conceptions and knowledge: the KVP model of Clement and the structural model of Balacheff. In order to prove the necessity to shift the conceptions as claimed by Giordan’s allosteric model, it is important to study the evolution and the relationship between conceptions and knowledge. This research deals with the following questions: what sort of relationship can be established between conceptions and knowledge? What factor can make these two parameters evolve? This study was carried out on 45 pupils (two classrooms). It intended to collect conceptions and knowledge before and after science learning training. Indiv…
Unusual oxygen binding behavior of a 24-meric crustacean hemocyanin.
2009
Abstract Hemocyanins from Crustacea usually are found as 1 × 6 or 2 × 6-meric assemblies. An exception is the hemocyanin isolated from thalassinidean shrimps where the main component is a 24-meric structure. Our analysis of oxygen binding data of the thalassinidean shrimp Upogebia pusilla based on a three-state MWC-model revealed that despite the 24-meric structure the functional properties can be described very well based on the hexamer as allosteric unit. In contrast to the hemocyanins from other thalassinidean shrimps the oxygen affinity of hemocyanin from U. pusilla is increased upon addition of l -lactate. A particular feature of this hemocyanin seems to be that l -lactate already enha…