Dither is an intentionally applied form of noise used to randomize quantization error, preventing large-scale patterns such as color banding in images. Dither is routinely used in processing of both digital audio and digital video data, and is often one of the last stages of audio production to compact disc.
Hepatic porphyria. Hepatic porphyrias is a form of porphyria in which the enzyme deficiency occurs in the liver. Examples include (in order of synthesis pathway): Acute intermittent porphyria. Porphyria cutanea tarda and Hepatoerythropoietic porphyria.
Helicobacter pylori (H. pylori) is a bacterium that can inhabit various areas of the stomach and small intestine. It causes a chronic low-level inflammation of the stomach lining and is strongly linked to the development of ulcers and stomach cancer. Over 80% of individuals infected with the bacteria are asymptomatic.