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S PHASE

The period in the cell cycle during which the nuclear DNA content doubles. See panel on Cell cycle, sphen-,

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S STATE

State of zero orbital angular momentum.

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S-BAND

Loose definition, due to international disagreement, of microwave band in the 2-3 GHz region.

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S-R THEORY

Abbrev for stimulus and resyonse theory. The stimulus response theory of learning which holds that the basic components of learning are S-R bonds, stimuli and responses which become forged together as learning proceeds.

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S-TERMINAL

A four-pin connector for separated Y/ C signals,

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S-TRAP

A trap used in sanitary pipes in which the oudet leg is parallel with the inlet leg.

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S-VHS

Abbrev for super VHS. TN for a high-band version of the VHS format, using a Y/C signal. Both con

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S-WAVE

Abbrev for secondary wave. See earthquake,

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S/N CURVE

Abbrev for stress-number of cycles to failure curve. See panel on Fatigue,

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SABIN

Obsolete unit of acoustic absorption: equal to the absorption, considered complete, offered by 1 ft2 of open window to low-frequency reverberant sound waves in an enclosure. Also open window unit.

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