Spread spectrum. In telecommunication and radio communication, spread-spectrum techniques are methods by which a signal (e.g., an electrical, electromagnetic, or acoustic signal) generated with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth.
Lipids are one of the four major groups of organic molecules; the other three being proteins, nucleic acids (DNA), and carbohydrates (sugars). Lipids are made up of the same elements as carbohydrates: carbon, hydrogen, and oxygen.
Lipids are large molecules made from smaller units of fatty acids and glycerol. The structure of a lipid molecule. In the diagram, you can see how three long chains of carbon atoms are attached to a glycerol molecule, with its three carbon atoms. They are esters made from fatty acids and glycerol. 2  lipid Fat or oils composed of fatty acids and glycerol. 3  metabolism All the chemical reactions in the cells of an organism, including respiration. 4  molecule A collection of two or more atoms held together by chemical bonds.