An alternative analytical method for measuring the kinetic parameters of the enzymes invertase and lactase is described. Invertase hydrolyzes sucrose to glucose and fructose and lactase hydrolyzes lactose to glucose and galactose. In most enzyme kinetics studies, photometric methods or test strips are used to quantify the derivates of the substrates. The use of a commercial blood glucose meter to determine the hydrolyzed glucose is described. This inexpensive and efficient method can be used when teaching enzymatic kinetics in lower-level biochemistry laboratories.
Goldrubinglas gilt als Schlüssel zur chemischen Nanotechnologie. Es werden im Beitrag Methoden beschrieben, um mithilfe golddotierter Alkoholat‐Lösungen Glasoberflächen nach dem Sol‐Gel‐Verfahren zu beschichten. Die Verfahren wurden professionell durchgeführt, es kamen aber auch Low‐Cost‐Methoden zum Dip‐ und Spin‐Coating zum Einsatz. Die Oberflächen wurden spektroskopisch und ellipsometrisch untersucht.
Nanochemie ist ein aktuelles Forschungsgebiet, das auch im Chemieunterricht vorkommen sollte. Versuche dazu gab es bereits vor über 100 Jahren. Leicht abgewandelt eignen sie sich auch heute noch für die Schule.
Nanoscience seems to be a main topic of this century. The chemical fundamentals are very old and named colloids since Graham in 1861. The acronym nano has been introduced in 1960 at a conference of measures and weights in Paris. In 1982 Binnig and Rohrer invented the scanning tunnel microscope(STM) and four years later Binnig the atomic force microscope(AFM). These microscopes are the main tools for the nanotechnology and from this times the number of publications exploded. In this article we'll focus on the chemical aspects of nanotechnology and how to implement experiments into school.
Keywords: nanochemistry, history, colloids, fundamental reaction principles, experimentsCite This Article: P. Heinzerling, and M. Oetken, "Nanochemistry -A Split between 18th Century and Modern Times
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.