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.
Zinc compounds such as zinc oxide are found in many common commercial products, including batteries, paint, plastics, rubber products, pharmaceuticals, floor coverings, inks, cosmetics, soap, and textiles. Zinc is also a natural insect repellent and sun screen, helping to protect our skin.fter iron, aluminium, and copper, zinc is the fourth most common metal we use today. Around 70% of the world's zinc comes from mining, the remaining 30% comes from recycling the metal because zinc is 100% recyclable.