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p20

1. p20-ARC One of the subunits of ARP2/3. 2. p20-CGGBP (CGG-binding protein1) A protein that binds to the unmethylated form of the trinucleotide repeat ...

phon

phon   Reference library

The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

Reference type:
Subject Reference
Current Version:
2009

...Symbol: phon A unit of loudness level, judged subjectively. The loudness level of a sound in phons is: 20 log 10 ( p / p 0 ), where p is the effective (r.m.s.) *sound pressure (in *pascals ) of a standard pure tone of frequency 1 kHz that is judged by a normal observer under standardized conditions as being equally loud as the sound; p 0 is a pressure of 20...

nuclear reaction

nuclear reaction   Reference library

The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

Reference type:
Subject Reference
Current Version:
2009

...reaction A reaction between *nuclides , expressed in the form: X i (P i , P o )X f , where X i and X f are the initial and final nuclides and P i and P o are the incoming and outgoing particle(s). Examples include: 14 N(α, p) 17 O 59 Co(n, γ) 60 Co 23 Na(γ, 3n) 20 Na 31 P(γ, pn) 29 Si, where p, n, α, and γ are symbols for the proton, neutron, alpha particle, and photon,...

sound pressure

sound pressure   Reference library

The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

Reference type:
Subject Reference
Current Version:
2009

... p A physical quantity, the difference between the instantaneous total pressure and the static pressure, i.e. the pressure that would exist in the absence of sound waves. The *SI unit is normally the pascal but the bar may also be used. The term acoustic pressure is more general, applying to ultrasound and infrasound as well as audible sound, but it has the same symbol and units as sound pressure. The sound pressure level , symbol L p , is a dimensionless quantity equal to: log e ( p / p 0 ) = log e 10.log 10 ( p / p 0 ), in *nepers , or 20log 10 ( p /...

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