| Hertz, Heinrich | <person, physics> 19th-century German physicist who first observed low-frequency electromagnetic waves. (13 Nov 1997) |
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| hertzian | Attributed to or described by Heinrich R. Hertz. (05 Mar 2000) |
| hertzian experiments | Experiment's demonstrating that electromagnetic induction is propagated in waves, analogous to waves of light but not affecting the retina. (05 Mar 2000) |
| Herxheimer's reaction | An inflammatory reaction in syphilitic tissues (skin, mucous membrane, nervous system, or viscera) induced in certain cases by specific treatment with Salvarsan, mercury, or antibiotics; believed to be due to a rapid release of treponemal antigen with an associated allergic reaction in the patient. Synonym: Jarisch-Herxheimer reaction. (05 Mar 2000) |
| Herxheimer, Karl | <person> German dermatologist, 1861-1944. See: Herxheimer's reaction, Jarisch-Herxheimer reaction. (05 Mar 2000) |
| herz hormone | A substance present in extracts of cardiac tissue that augments cardiac contraction; possibly adenosine, a catecholamine, or some non-specific stimulant present generally in tissues. Synonym: cardiac hormone, heart hormone. (05 Mar 2000) |
| herzstoss | Cardiac systole characterised by a diffuse precordial heave with or without any definite point of maximal impulse. Origin: Ger. Heart thrust (05 Mar 2000) |