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. Like carbohydrates, lipids are organic compounds that are high in energy and are made of carbon, hydrogen, and oxygen, but lipids have more energy than carbohydrates. Lipids are stored in cells for later use. Some examples of lipids are oils, fats, and waxes.