| browse protection | <ecology> Mechanical or chemical protection of shrubs and trees against damage caused by game and grasing animals. (09 Oct 1997) |
|---|---|
| cathodic protection | <chemistry> The attachment of an active metal to a system to protect the system from corrosion. The active metal serves as the anode, making the metal in the system a cathode. (16 Mar 1998) |
| protection | Synonym: protective block. Origin: see protective (05 Mar 2000) |
| protection test | A test to determine the antimicrobial activity of a serum by inoculating a susceptible animal with a mixture of the serum and the virus or other microbe being tested. Synonym: neutralization test. (05 Mar 2000) |
| sun protection factor | A number on a scale (from 2 upwards) for rating sunscreens. Sunscreens with an spt of 15 or higher provide the best protection from the sun's harmful rays. (12 Dec 1998) |
| ecological protection | <ecology> Protection consists of measures undertaken to protect and preserve elements of an ecosystem's structure and functions against future degradation. (10 Nov 1998) |
| environmental protection agency | <organisation> The U.S. Regulatory agency for biotechnology of microbes. The major lawsunder which the agency has regulatory powers are the Federal Insecticide, Fungicide, and Rodenticide act (FIFRA), and the Toxic Substances ControlAct (TSCA). (30 Mar 1998) |
| united states environmental protection agency | An agency in the executive branch which endeavors to abate and control pollution in the areas of air, water, solid waste, noise, radiation, and toxic substances. (12 Dec 1998) |
| abnormalities, radiation-induced | Congenital changes in the morphology of organs produced by exposure to ionizing or non-ionizing radiation. (12 Dec 1998) |
| accidents, radiation | Accidental dispersal of radioactive materials from a radiation source. Accidents at nuclear reactors can involve large groups of the population from dispersion of radioactivity into the environment and through fallout or a few individuals with high injurious doses. (12 Dec 1998) |
| acoustic radiation | The fibres that pass from the medial geniculate body to the transverse temporal gyri of the cerebral cortex by way of the sublentiform part of the internal capsule. Synonym: radiatio acustica. (05 Mar 2000) |
| acute radiation syndrome | <syndrome> A syndrome caused by exposure of the body to large amounts of radiation, (e.g., from certain forms of therapy, accidents, and nuclear explosions; it is divided into three major forms which are, in ascending order of severity, the haematogic, gastrointestinal, and central nervous system-cardiovascular forms; its clinical manifestations are divided into prodromal, latent, overt, and recovery stages. (05 Mar 2000) |
| adaptive radiation | <chemistry> The evolution of new speciesor sub-species to fill unoccupied ecological niches. (06 May 1997) |
| alpha radiation | <physics, radiobiology> The most easily absorbable type of radiation, it consists of a stream of alpha particles, doubly ionised helium nuclei which are electrically charged and produce intense ionisation in matter. Alpha radiation can be deflected in electromagnetic fields. (09 Oct 1997) |
| annihilation radiation | The radiation resulting when a positron from beta positive decay comes to rest. It encounters an electron, and they annihilate each other and convert their rest mass into two 0.51-MeV gamma rays emitted in exactly opposite directions. (05 Mar 2000) |