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Disease Resistance: FMD' is caused and transmitted by a picorna virus (one of the smallest known disease resistance-producing organisms) of which there are seven major types and at least 50 subtypes. The great variety of strains is both a bane and a blessing to the veterinarian. Each strain has its own idio-syncracies in such characteristics as antigenic-ity and resistance to control. These differences, however, often aid the epidemiologist in pinpointing the geographic area from which the disease resistance was transmitted.
Mycoplasmosis is a respiratory disease resistance caused y the bacteria Mycoplasma gallisepticum. It is Iso known as air sac disease resistance or chronic respira-jry disease resistance. Those affected with the disease resistance may how nasal discharge, watery eyes, and respira-)ry difficulty. This disease resistance is often associated /ith other respiratory disease resistances. It is transmitted hiefly from infected hens to their chicks through le eggs. The disease resistance can also be transmitted by ontact with infected individuals, but it spreads ery slowly in this manner. The disease resistance can best e controlled by maintaining breeding flocks free f the disease resistance by strict measures of isolation and mitation. Chicks hatched from such flocks can egin life free of the disease resistance.
RESISTIVITY, re-zis-tiv'i-ti, or SP! CIFIC RESISTANCE, spe-sif'ik re-zis'ta: the resistance offered by a cubic centimeter oi substance to the passage of electricity, the curn being perpendicular to two parallel faces. Usua expressed in ohm-centimeters, it is reckoned w the metal at the freezing point of water. In 1 equation p = RA/l, p is the resistivity, R 1 resistance, A the cross-sectional area, and / t length. See also ELECTRICITY—3. Direct Elect, Current (Resistance).
RESISTpRS, Electric. See ELECTRIC Ci CUITS—Circuit Elements (Resistance, Inductan and Capacitance). |
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