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Carrier Of Disease: The presence of carrier with the radioisotope often undesirable. This may be because a gh specific activity is needed or because carrier otopes have nuclear properties which are in-lerable in the particular application. In these ises several methods of carrier-free separation ay be used. Probably one of the most widely jplicable methods uses a column filled with ion-tchange resin.
In frequency modulation the modulating signal changes the frequency of the carrier wave while the amplitude of the carrier remains constant (unchanged). Thus, change of frequency rather than change of amplitude (as in AM systems) is the information-bearing characteristic of the modulated carrier.
Bluebottle Flies and Blowflies
Because of the long fight against the house fly as a carrier of disease, it is difficult for one to have a tolerant attitude toward any fly. The habits of a large number of them are unspeakable. However, they have a necessary function, and it is important that they fill it.
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