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X, 2X, 3X....

Symbols for the number of copies of the haploid chromosome number or basic chromosome set. x Chem Symbol for mole fraction.

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X-AXIS

The longitudinal, or roll, axis of an aircraft. Cf axis.

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X-BAND

Microwave band lying roughly between eight and 12 GHz; slight discrepancy between US and UK band limits. Widely used for 3 cm radar which is now correcdy designated Cx-band.

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X-GUIDE

A transmission line with an X-shaped cross- section dielectric, used for guiding surface waves,

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X-HEIGHT

The height of the lower case letters from the baseline excluding extenders; specifically the height of the lower case x. See fig. at typeface.

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X-INACTIVATION

Permanent condensation in early development of one or other X-chromosome in female mammalian cells, with accompanying repression of most of the genes on that chromosome,

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X-ORGAN

A neurosecretory organ in the eye-stalks of certain Crustaceans.

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X-PLATES

Pair of electrodes in a cathode-ray tube to which horizontal deflecting voltage is applied in accordance with cartesian co-ordinate system.

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X-RAY

An electromagnetic wave of short wavelength ca 10

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X-RAY ASTRONOMY

The study of the emission of astronomical objects at X-ray wavelengths. Observations are made at high altitude above approx 150 km as the Earth

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