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.
1 Lipid: a building block of life (molecule) made from smaller pieces (fatty acids). 2  There are several kinds of lipids-fats, waxes, sterols,... 3  more. 4  Nucleic acids: are compounds that make up the DNA strand.