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.
Lipids are mostly composed of carbon, hydrogen, oxygen, but other elements, such as nitrogen, phosphorus and others can be found also.See Web LinksSee the Web Links to the left for more information.ut technically, lipids are a class of molecules that includes triglycerides, phospholipids, steroids, and waxes. So if you wanted to know what elements are found in lipids as a class, you'd have to allow for phosphorus as well, since phospholipids contain phosphorus in addition to carbon, hydrogen, and oxygen.