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A20

A cytoplasmic zinc finger protein (790 aa) that inhibits NFκB activity and TNF-mediated programmed cell death. The expression of the A20 mRNA is upregulated by TNFα. It is a dual function ...

Bourbaki

Bourbaki   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

..., Nicolas Pseudonym for a group of 20th-century French...

sedimentation coefficient

sedimentation coefficient   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...coefficient Symbol: s The rate of sedimentation of a particle in an ultracentrifuge. Sedimentation coefficients corrected to 20 °C in water are specified as s 20,w ; sedimentation coefficients at zero concentration are specified as s 0 or s 0 20,w . Sedimentation coefficients of macromolecules and cellular particles are normally expressed in *Svedberg units...

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...

mega-

mega-   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...1 Symbol: M A prefix to a unit of measurement that indicates 10 6 times that unit, as in megavolt ( MV ) or megahertz ( MHz ). See also SI units . 2 A prefix used in computing to indicate a multiple of 2 20 (i.e. 1 048 576), as in megabyte. 3 A general prefix denoting large size (e.g. meganucleus,...

decibel

decibel   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...Symbol: dB A dimensionless unit defined on a logarithmic basis and is used, especially in acoustics and telecommunications, to express *sound pressure levels or *power level differences. It is a more practical unit than the bel , which is equal to 10 decibels. It is related to the neper (Np): 1 dB = (log e 10)/20 Np = 0.115 129...

fibroblast growth factor

fibroblast growth factor   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...growth factor Abbrev.: FGF   Any of a family of proteins that influence the normal growth and differentiation of certain cells types. Over 20 members have been identified so far, distinguished by a suffixed Arabic number; for example, FGF-5, FGF-23. FGF-1 was originally named acidic fibroblast growth factor (aFGF), and FGF-2 was originally termed basic fibroblast growth factor...

relative density

relative density   Reference library

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

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Subject Reference
Current Version:
2009

...density Symbol: d Abbrev.: r.d. A dimensionless quantity, the ratio of the *density of a substance to the density of a reference substance under specified conditions. For a gas, the reference substance is usually air, both being at stp. For a solid or liquid at a specified temperature (often 20 °C), the reference substance is water at 4 °C (when it has its maximum density, 1000 kg m −3 ). Formerly called specific gravity. See also specific...

amino acid

amino acid   Reference library

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

Reference type:
Subject Reference
Current Version:
2009
Subject:
Language reference, Writing and Editing Guides
Length:
63 words
Illustration(s):
1

...acid (two words) Symbols for the 20 or so amino acids commonly found in proteins are typically formed from the first three letters of the name, printed in lower case with an initial capital letter; for example, alanine is Ala, glycine is Gly (see table). Each also has a single-letter symbol; these are used in depicting the sequences of proteins ( see peptide...

ounce

ounce   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...Symbol: oz A unit of mass used in the UK and USA, equal to 1 / 16 pound or 28.3495 grams. This is the avoirdupois ounce and must be differentiated from the troy ounce (equal to 480 grains, 31.1035 grams) and the apothecaries' ounce (equal to the troy ounce). The apothecaries' ounce and its submultiples – the scruple (20 grains) and the drachm (60 grains) – are no longer used in the UK. See also fluid ounce...

terpene nomenclature

terpene nomenclature   Reference library

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

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Subject Reference
Current Version:
2009

...make up their carbon skeletons: hemiterpenes (C 5 ); monoterpenes (C 10 ); sesquiterpenes (C 15 ); diterpenes (C 20 ); sesterterpenes (C 25 ); triterpenes (C 30 ); tetraterpenes (i.e. carotenoids; C 40 ); and polyterpenes (C 5 n ). Classes of the wider family of terpenoids , which includes terpenes and their natural derivatives, are named in the same way: for example, sesquiterpenoids have a C 15 skeleton (e.g. farnesol), triterpenoids have a C 30 skeleton (e.g....

binary prefixes

binary prefixes   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...there is a variation in usage depending on the context. In discussing memory capacities megabyte generally means 2 20 bytes, but in disk storage (and data transmission) megabyte is often taken to mean 10 6 bytes. (In some contexts, as in the capacity of a floppy disk, it has even been quoted as 1 024 000 bytes, i.e. 1000 times a (binary) kilobyte.) The IEC attempted to resolve this confusion by introducing binary prefixes, modelled on the normal decimal prefixes, as follows: kibi- 2 10 mebi- 2 20 gibi- 2 30 tebi- 2 40 pebi- 2 50 exbi- 2 60 zebi- 2 70...

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 (...

cgs (or c.g.s.) units

cgs (or c.g.s.) units   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...gauss, oersted, and gilbert, and were of a convenient size. The emu for electrical measurements were, however, either extremely large or extremely small. The practical units – the ohm, volt, ampere, coulomb, farad, and henry – were therefore introduced. The practical units were a power of 10 times smaller or larger than their electromagnetic counterparts. A combination of the practical units and the magnetic emu gave the practical electrical system . This hybrid system was widely used in the late 19th and early 20th centuries but has been largely displaced...

Streptococcus

Streptococcus   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...streptococci ( see haemolysis ). Another well-established system, the Lancefield classification, classifies streptococci according to the serological reactivity of cell-wall polysaccharides. This identifies 20 or so distinct serogroups, each denoted by a capital letter; for instance, S. pyogenes is a group A streptococcus, and S. suis is group R. But note that some group antigens occur in more than one species, and no Lancefield antigen has been identified for the important pathogen S. pneumoniae . However, immunological studies of antigenic...

SI units

SI units   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...in a table of values. It is recommended that only one prefix be used in forming a multiple or submultiple of a compound unit. Symbols for units and prefixes should be printed in roman type, irrespective of the type used in the rest of the text. Unit symbols should remain unchanged in the plural (i.e. 20 kg not 20 kgs), should be written without a final full stop, except for normal punctuation, and should be placed after the complete numerical value for a quantity, leaving a space between value and unit symbol. No space should be left between the symbols for a...

soil classification

soil classification   Reference library

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

Reference type:
Subject Reference
Current Version:
2009

...zonal, intrazonal (transitional), and azonal soils, developed in Russia in the early 20th century. Zonal soils correspond to a particular climatic or vegetational zone; intrazonal soils are influenced by local factors that modify the prevailing climate (e.g. topology); and azonal soils are immature soils that are too young to reflect the effects of climate. These three principal categories accommodated the so-called ‘great soil groups’, with each group containing soils of a similar nature. These groups (e.g. sierozems, chestnut soils, chernozems, etc.) are...

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