THE birefringence of barium titanate has been measured over the range 4000–7000 A. Our attention was first directed to this work by the impossibility of obtaining the correct colour sequence in ...

Methyl bromide (CH3Br) is a colourless, odourless, non-flammable gas. It can come from natural or industrial sources. It is mainly used as a fumigant. Methyl bromide damages the ozone layer once ...

The presence of coliform bacteria and/or E. coli or fecal coliforms in wells or springs usually result from: Trace metals may occur naturally in ground water in very small amounts and may include ...

consisting of a few crystals of barium platinocyanide on a piece of cardboard, lay handy on an adjacent bench—barium platinocyanide being a substance commonly used at the time to detect the ...

If you do not meet these requirements, you may face civil or criminal penalties. To import, export or manufacture methyl bromide, you must hold a controlled substance licence. You must pay a ...