chromatogram: the recording (column or paper strip) on which the constituents of a mixture are adsorbed in chromatography
recording: a signal that encodes something (e.g., picture or sound) that has been recorded
hepatitis b: an acute (sometimes fatal) form of viral hepatitis caused by a DNA virus that tends to persist in the blood serum and is transmitted by sexual contact or by transfusion or by ingestion of contaminated blood or other bodily fluids