Science / Biology / Actin: The protein from which microfilaments are composed; forms the contractile filaments of sarcomeres in muscle cells.


Science / Psychiatry / Hyperprolactinaemia: An abnormally high level of prolactin in the blood which can occur in both men and women. Typical and some atypical antipsychotics can increase serum levels which can result in menstrual and hormonal MORE


Science / Chemistry / Actinide: Elements 89-102 are called actinides. Electrons added during the Aufbau construction of actinide atoms go into the 5f subshell. Actinides are unstable and undergo radioactive decay. The most common ac MORE

Protactinium (Pa)

Science / Periodic Table of Elements / Protactinium (Pa): Atomic number: 91, Atomic mass: 231.0359 g.mol -1, Electronegativity: 1.5, Density: 15.37 at 20°C, Melting point: 1600 °C, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: u MORE

Acting Out

Science / Psychiatry / Acting Out: This is the process of expressing unconscious emotional conflicts or feelings via actions rather than words. The person is not consciously aware of the meaning or etiology of such acts. Acting out may MORE


Science / Biology / Prolactin: A hormone produced by the anterior pituitary; secreted at the end of pregnancy when it activates milk production by the mammary glands. MORE

Actinium (Ac)

Science / Periodic Table of Elements / Actinium (Ac): Atomic number: 89, Atomic mass: 227 g.mol -1, Electronegativity: 1.1, Density: 10.07 at 20°C, Melting point: 1050 °C, Boiling point: 3250 °C, Vanderwaals radius: unknown, Ionic radius: unkno MORE