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0.5

0.5  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
orsymbol (in enzyme kinetics) for the value of the concentration of a substrate, A, in mol dm−3, at which the velocity of the reaction, v, is half the maximum velocity, V; i.e. when v = 0.5V.[...]
14

14  

Reference type:
Overview Page
Subject:
Science and technology, Life Sciences
C a radioactive isotope of normal carbon (12C) emitting a weak beta particle. The half-life of 14C is 5,700 years. This radioisotope is extensively used as a tracer in molecular biology.
50

50  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
symbol for the molar concentration of an agonist that produces 50% of the maximal possible effect of that agonist. Other percentage values ([A]20, [A]40, etc.) can be specified. The action of the ...
2′-5′A

2′-5′A  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
symbol for any member of a series of oligonucleotides of the general formula pa A[2′p5′A]n, where p and A are phosphoric and adenosine residues, respectively, and a and n are ...
A

A  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
symbol for1 acid‐catalysed (of a reaction mechanism).2 a residue of the α‐amino acid l‐alanine (alternative to Ala).3 a residue of the base adenine in a nucleic‐acid sequence.[...]
A

A  

Reference type:
Overview Page
Subject:
Science and technology, Mathematics and Computer Science
The number 10 in hexadecimal notation.
a

a  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
1 abbr. for adsorbed.2 symbol for atto+ (SI prefix denoting 10−18).3 axial.4 year.
A

A  

Reference type:
Overview Page
Subject:
Science and technology, Life Sciences
1. mass number of an atom; 2. haploid set of autosomes; 3. ampere; 4. adenine or adenosine.
a

a  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
symbol for1 absorption coefficient.2 acceleration (in vector equations it is printed in bold italic (a).3 activity (def. 3).4 van der Waals coefficient.5 as subscript, denotes affinity.[...]
A

A  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
symbol for1 absorbance.2 activity (def. 2).3 affinity.4 Helmholtz function.5 mass number/nucleon number.
Å

Å  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
symbol for ångström (unit of length equal to 10−10 m).
a

a  

Reference type:
Overview Page
Subject:
Science and technology, Life Sciences
The usual abbreviation for year (from the Latin annus, meaning year).
(A + T)/(G + C) ratio

(A + T)/(G + C) ratio  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
The ratio of the sum of the adenine plus thymine bases to the sum of the guanine plus cytosine bases in a DNA molecule or preparation. The ratio is to ...
A 1 cell

A 1 cell  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
(formerly) an alternative name for D cell.
A 2 bu

A 2 bu  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
orsymbol for a residue of the α, γ‐diamino acid l‐α, γ‐diaminobutyric acid, l‐2,4‐diaminobutanoic acid.
A 2 pm

A 2 pm  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
orsymbol for the di(α‐amino acid) α,ɛ‐diaminopimelic acid, 2,6‐diaminoheptanedioic acid.
A 2 pr

A 2 pr  

Reference type:
Overview Page
Subject:
Science and technology, Chemistry
orsymbol for a residue of the α,β‐diamino acid l‐α,β‐diaminopropionic acid; l‐2,3‐diaminopropanoic acid.
A* algorithm

A* algorithm  

Reference type:
Overview Page
Subject:
Science and technology, Mathematics and Computer Science
A member of the class of best-first heuristic search techniques that attempt to find a “best” path from a given start node to a designated goal node in a problem graph. An evaluation function is used ...
A, B antigens

A, B antigens  

Reference type:
Overview Page
Subject:
Science and technology, Life Sciences
Mucopolysaccharides responsible for the ABO blood group system. The A and B antigens reside on the surface of erythrocytes, and differ only in the sugar attached to the penultimate monosaccharide ...
A. Penck

A. Penck  

Reference type:
Overview Page
Subject:
Science and technology, Earth Sciences and Geography
(1858–1945)A German mineralogist from the University of Berlin, Penck's main interest was in Quaternary glacial land-forms, which he classified according to shape. Some of his work was done in ...

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