Chemical structure of lipid A as found in E. coli. Lipid A is a lipid component of an endotoxin held responsible for the toxicity of gram-negative bacteria. It is the innermost of the three regions of the lipopolysaccharide (LPS), also called endotoxin molecule, and its hydrophobic nature allows it to anchor the LPS to the outer membrane.
watermark - Computer Definition. 1  A translucent mark or image in paper produced by pressing the paper in a mold or on a processing roll during the manufacturing process. The watermark is visible when the paper is held to a light. A watermark is used as a sign of authenticity in order to make the counterfeiting of currency and postage stamps more difficult, for example.
Biomarkers (short for biological markers) are biological measures of a biological state. By definition, a biomarker is a characteristic that is objectively measured and evaluated as an indicator of normal biological processes, pathogenic processes or pharmacological responses to a therapeutic intervention..iomarkers are used to predict serious illnesses such as diabetes and cardiovascular disease. Each individual biomarker indicates whether there is a disease or health state and can be combined to provide a detailed picture of how healthy a person is and whether or not a diagnosis needs to be made.