1 A computer file format for STereoLithography, or Standard Tessellation Language. 2  It describes a physical space mathematically as a series of small triangles using a three-dimensional coordinate system, and is widely used in dentistry.
Phospholipids consist of a polar molecule, a phosphate group, a glycerol unit and two fatty acids. They are found in cell membranes, which enclose the cytoplasm and other parts of a cell. Steroids include cholesterol, cortisone and sex hormones, such as estrogen, testosterone and progesterone. They have a carbon backbone that contains four fused ring-like structures.
3. Phospholipids: This class of lipids are really derivatives of triglycerides. The are composed of a glycerol molecule with two fatty acids (a diglyceride). The third carbon contains a phosphate group and usually some added polar molecule (such as ethanolamine, serine or choline).. Phospholipids: This class of lipids are really derivatives of triglycerides. The are composed of a glycerol molecule with two fatty acids (a diglyceride). The third carbon contains a phosphate group and usually some added polar molecule (such as ethanolamine, serine or choline).