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UBIQUITIN

Polypeptide of wide distribution in both prokaryotes and eukaryotes. It is attached to proteins prior to their degradation in the course of cellular protein turnover.

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UDDER

The popular name for the mammary glands of certain animals, eg of the cow. mare, sow and ewe.

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UGRANDITE

A group name for the uvarovite, ^rossular and rtm/radite garnets.

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UHMPE

Abbrev for ultrahigh molecular mass polyethylene

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UHURU

The first X-ray astronomy satellite. Launched from Kenya in 1970. it made the first detailed map of the X- ray sky.

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UINTAITE

A variety of natural asphalt occurring in the Uinta Valley, Utah, as rounded masses of brilliant black solid hydrocarbon. Also gilsonite.

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UL 94 FLAMMABILITY

Burning test for polymers where a rod, held in a flame under test conditions, is rated on a scale depending on eg the rate of burning. See NBS smoke test

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ULBRICHT SPHERE PHOTOMETER

A photometer for directly measuring a lamp

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ULCERATIVE

Of the nature of, or pertaining to. ulcers; causing ulceration; associated with ulceration eg ulcerative colitis.

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ULCERATIVE DERMAL NECROSIS

A fungus disease of salmon.

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