Predicting selection response for growth of channel catfish.

Estimates of heritability, phenotypic and genetic correlations were obtained for body length and weight at 5 months and body length and weight at 15 months in channel catfish. The estimates were obtained from a half-sib analysis by mating 20 males to two females each, producing 20 half-sib and 40 full-sib progeny families. Mortality of fish during the study reduced the number of families to 17 half-sib and 34 full-sib.

An ultrasound receiver with programmable time gain control.

An ultrasound receiver with programmable time gain control (TGC) has been developed. The TCG curve is synthesized from sequentially gated analog switches, each of which controls receiver gain over a range of 1cm. Diagnostic studies using a receiver with the programmable TGC curve show improved results in the amplitude equalization of received echoes and in the output display.

New systems for a two-speed electroencephalograph with an auditory device for diminishing the length of seizures.

The author describes a system for testing patients with petit mal seizures. The system has the following advantages: 1) EEG paper speed is automatically increased from 2.5 mm/s to 25 mm/s when brainwave activity increases, with the increased speed maintainable for up to 4.