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 uniquely biological molecules, and they are synthesized and used by organisms in a variety of important ways. Unlike proteins, polysaccharides, and nucleic acids, lipids are much smaller, water-insoluble molecules.They are synthesized in association with a cellular organelle called the smooth endoplasmic reticulum. In a word, they are, as their etymology suggests, fats. Several types of fats are made from fatty acids.nlike proteins, polysaccharides, and nucleic acids, lipids are much smaller, water-insoluble molecules. They are synthesized in association with a cellular organelle called the smooth endoplasmic reticulum. In a word, they are, as their etymology suggests, fats.