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P LATTICE

Abbrev for primitive crystal lattice. See fig. at unit cell

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P-680

A chlorophyll a-protein complex absorption peak at /.=684nm that acts as the light trap in photosystem II.

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P-700

A chlorophyll a-protein complex absorption peak at /.=700nm that acts as the light trap in photosystem I.

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P-DISPLAY

That of a PPI unit. Map display produced by intensity modulation of a rotating radial sweep.

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P-GROUP

A group for which every element's order is a power of p, where p is a prime number.

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P-P JUNCTION

One between p-type crystals having different electrical properties,

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P-PROTEIN

Phloemprotein. Present in phloem cells esp in sieve elements.

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P-SHELL

The electron shell in an atom corresponding to a principal quantum number of six. In naturally occurring elements it is never completely filled and is the outermost shell for most stable heavy elements. See panel on Atomic structure

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P-STATE

That of an orbital electron when the orbit has angular momentum of one Bohr unit.

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P-TRAP

A trap used in sanitary pipes with the inlet vertical and the outlet inclined slightly below the horizontal.

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