| helium 3 |
ABBR: 3 He. An isotope of helium whose nucleus contains two protons and a single neutron. Helium 3 is a stable gas. The isotope is polarizable, making it suitable as a gaseous contrast agent for use in magnetic resonance ima
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| heli(o)- |
a combining form denoting relationship to the sun.
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| helianthin |
methyl orange; see under orange.
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| helic(o)- |
a combining form denoting relationship to a coil.
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| helical s. |
an arrangement of capsomers seen in viruses with a rodlike or filamentous capsid, in which subunits form a coiled structure, with each subunit forming bonds with the subunit in each of the adjoining turns to provide stability.
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