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Z BOSON

A particle that mediates the weak interaction; symbol Z; mass 94GeV; charge zero; spin 1; decays to an electron plus positron, or a muon plus antimuon. Predicted by the Weinberg-Salam theory, it was discovered in 1983 in proton-antiproton collisions at CERN in Geneva.

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Z MARKER BEACON

A form of marker beacon radiating a narrow conical beam along the vertical axis of the cone of silence of a radio range.

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Z SCHEME

Scheme linking photosystem II and photosystem I such that oxygen is produced by the former, NADP is reduced by the latter and ATP is generated by non-cyclic photophosphorylation by electron transport from PS II to PS I.

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Z-AVERAGE MOLECULAR MASS

Symbol Az. Molecular mass measure giving greater emphasis to bigger polymer chains, usually obtained by sedimentation analysis in an ultracentrifuge. See molecular mass distribution

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Z-AXIS

The normal, or yaw. axis of an aircraft. Cf axis,

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Z-AXIS MODULATION

Variation of intensity of beam, producing varying intensity of brightness of trace.

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Z-BLADE MIXER

Type of mixer for viscous polymer eg prepolymer and filler plus additives etc. Often involves two counter-rotating Z-shaped blades esp for dough moulding compound mixtures for composite products.

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Z-DNA

A form of duplex DNA, in which purines and pyrimidines alternate in a strand and which results in a left- handed helix.

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Z-HELIX

A helix winding in the sense of a conventional, right-handed, screw,

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Z-LINE

These limit the sarcomeres of striated muscle and contain a-actin.

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