In a normal distribution, 68.2% of all scores cluster around the mean within approximately 1 standard deviation, 95.4% within approximately 2 standard deviations, and 99.7% within approximately 3 standard deviations.
Phospholipid-derived fatty acids (PLFA) are widely used in microbial ecology as chemotaxonomic markers of bacteria and other organisms.Phospholipids are the primary lipids composing cellular membranes. Phospholipids can be saponified, which releases the fatty acids contained in their diglyceride tail.ach phospholipid consists of a polar hydrophilic head (red) and two hydrophobic fatty acid tails. The fatty acid structure affects the bilayer structure. Fatty acids with an unsaturated tail (blue) disrupt the packing of those with only saturated tails (black).
- Generally long, straight chains of carbon atoms (4-22 carbon atoms) with hydrogen atoms (hydrocarbons) or alkyl groups attached and characterized by a terminal carboxyl group (COOH, acid) - They are derived from, or contained in an animal fat or vegetable oil. - Fatty acids are the building blocks of fats. - These long, straight chains combine with a glycerol molecule to form lipids (glycerol lipids) - Most naturally occurring fatty acids contan an even number of carbon atoms. - The 18-carbon fatty acids are the most abundant. - The tail of a fatty acid is a long hydrocarbon chain, making it hydrophobic.