CHEMISTRY: Chloramine Complexities

Taurine Chloramine Inhibits Inducible Nitric

Chloramine mutagenesis in Bacillus subtilis.

Chloramine (which occurs widely as a by-product of sanitary chlorination of water supplies) is shown to be a weak mutagen, when reversion of trpC to trpC in Bacillus subtilis is used as an assay. Some DNA-repair mutants appear to be more sensitive to chloramine, suggesting the involvement of DNA targets in bactericide. The influence of plating media on survival of cells treated with chloramine ...

Students’ Learning with the Connected Chemistry (CC1) Curriculum: Navigating the Complexities of the Particulate World

The focus of this study is students’ learning with a Connected Chemistry unit, CC1 (denotes Connected Chemistry, chapter 1), a computer-based environment for learning the topics of gas laws and kinetic molecular theory in chemistry (Levy and Wilensky 2009). An investigation was conducted into high-school students’ learning with Connected Chemistry, based on a conceptual framework that highlight...

Students’ foraging through the complexities of the particulate world in the Connected Chemistry (MAC) curriculum

In this paper, we describe five design principles that governed the design of the Connected Chemistry Curriculum and describe classroom research we conducted to evaluate the design. In the Modeling Across the Curriculum (MAC) project, high-school students explore computer models in science that are embedded in a supporting script. The Connected Chemistry curriculum focuses on topics in chemistr...

Determination of chloramine T in dairy products.

A method has been developed for the quantitative determination of traces of chloramine T (Activin, Halamid) in dairy products. Proteins are removed and the hydrolysis product toluene-4-sulphonamide is extracted with ether. After evaporation of the solvent, the residue is oxidized with an alkaline potassium permanganate solution. The oxidized product is isolated by ether extraction and the resid...