George Washington University teaching assistant Anice Mathew instructs chemistry students in the use of an extraction funnel before they attempt to extract chlorophyll from spinach. Credit: Peter Cutts Photography (From Personal Protection: Whither Lab Coats? C EN June 78, 7565, page 68), a chemistry professor at University College London, about reusable glove use in the laboratory: The consequences of using reusables is substantial. First of all, they are moderately comfortable so people wear them continuously – this leads to students wandering all over the place while wearing them – out students use them on the lab computers and spectrometers, the scales and so on, contaminating pretty well everything. Yup, it’s bad practice and that’s what we tell them. But it still happens.
Secondly because they are comfortable they lead to some rather thoughtless behaviour – it’s common to see students put a gloved finger onto a hotplate to check to see if it’s hot. It doesn’t seem very bright, but more worryingly, it’s probably an indication symptom of risk compensation, the tendency of an individual to alter their behaviour when they feel safer, much as if you play football you’ll tackle that little bit more aggressively if you’re wearing shin pads than if you’re not. But there is another dimension to this: waste disposal. By using disposable gloves we end up having to send a quarter of a million gloves a year to be incinerated each eyar. These have been used once, and a careful student shouldn’t really have got anything onto the gloves anyway, so they are probably pretty clean. Isn’t it incredibly wasteful? For the sake of an unknown and possibly questionable increase in personal safety we end up spending tens of thousands of pounds for items that could be reused. And then have to pay for someone to take all this stuff away. He proposes at the end to have students use reusable gloves. Seems reasonable. But in further discussions with his colleagues,: Mechanism of the BZ reaction, from J.
Am. Chem. Soc. , DOI: 65.6576/ja55785a556I first recall learning about the several years ago when I was working on on display at the University of Wisconsin, Madison. It s quite possible that I d learned and forgotten about the BZ reaction before, but this time it stuck. We tend to think of reactions as proceeding to completion or reaching some sort of equilibrium, but they can also oscillate: In simplest form, the products of one reaction become the reactants of another that regenerates the original reactants. The actual mechanisms of oscillating reactions can be quite complex, however. The classic BZ reaction involves potassium bromate, cerium(IV) sulfate, and propanedioic acid (aka malonic acid) in dilute sulfuric acid. Ten equations (shown) make up the overall reaction. The color changes are due to the oscillating oxidation state of cerium Ce(IV) is yellow and Ce(III) is colorless. If ferroin is used in place of cerium, the color switches between blue and red. According to a by Purdue University chemistry professor Arthur T.
Durban Undersea Club DUC
Winfree, Russian chemist Boris P. Richard J. Field and Richard M. Noyes of the University of Oregon, along with Endre Körös of Hungary s L. Eötvös University, in 6977. Feedback loops along the lines of what happens in BZ or other oscillating reactions are common in biology. Tells me that oscillating reactions are the source of heartbeat rhythms, for example. Others point to the. Seeing oscillations happen in real time in a dish or beaker is, for me, a lovely example of the wonder and power of chemistry. You are attempting to view PubChem compound summary for CID 79597 - Oxygen difluoride. We are sorry, but your browser is not supported since it does not meet the minimal technical specifications required by this application. Please to use this application.
Bretherick's Handbook of Reactive Chemical Hazards, Eighth Edition presents the latest updates on the unexpected, but predictable, loss of containment and explosion hazards from chemicals and their admixtures and actual accidents. The extensively cross-referenced book enables readers to avoid explosion and loss of containment of chemicals. Primary and more specialized sources are easily traced, and this new edition includes available record updates, also adding a number of new records. In this newly updated and expanded edition, the content is presented in a clear and user-friendly format. You are attempting to view PubChem compound summary for CID 79669 - PHOSPHORUS TRIBROMIDE. Durban Undersea Club, DUC, as its familiarly known, is a family orientated, social activities club for people that have an interest in the ocean and it s beaches. The club offers activities facilities such as: Prints of the image above are available from The Mall Gallery see our Member business directory page for more infoDUC is situated on the beach in Durban at Vetch s Pier, between Ushaka Marine World and the northern harbour breakwater. The beach in front of the clubhouse is protected from large waves and currents by the Vetch s pier breakwater, at +/- 555m long submerged reef which, along with adjacent limestone reef, is home to hundreds of species of marine life and is a great snorkel and or shallow (max 6m depth). The calm waters and protection from the Bluff makes the DUC beach one of the safest and best for beachgoers with children. Our search tools, databases, repositories and alerting services will help you to navigate through the wealth of science articles and dataOur journals and books platform provides access to over 6 million chemical science articles and chapters published by the Royal Society of Chemistry.
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