Classification of microbes based on specific nutritional requirements. Heterotroph = use carbon sources (sugars, alcohols, carbs, fats, proteins) Autotroph = use inorganic carbon source (CO2) Chemotroph = use organic (glucose)/inorganic (reduced Fe2+) chemicals for energy.
You can color any metal containing iron, such as steel, with the oven heat of an ordinary kitchen range. Depending on the temperature setting, the steel changes color across a spectrum of shades ranging from pale yellow to dark blue. In addition, literally hundreds of chemicals will change the color of metal surfaces. Some of them are too toxic for amateurs to use. For example, cyanides, nitric acid, chromic acid, mercuric chloride, and lead acetate are hazardous chemicals only professionals should attempt to use.
Very Cool. Put simply, colour temperature is based on how the colour of a heated metal changes as its temperature is increased-turning from red to yellow then blue. You can then determine the temperature of a heated metal by its colour. This range of colours at different temperatures has become useful for describing the colour tint of white light. The colour of light from an LED lamp is approximated or âcorrelatedâ to this scale.