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. Macromolecules made mainly from carbon, hydrogen, and oxygen atoms; includes fats, oils, and waxes; insoluble in water, used for long-term storage of energy and carbon, and for building structural parts of cell membranes; fatty acids and glycerol make up the simple fats most common in our diets.