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7
Absorption Line • Acacic Acid
Absorption Line
Synonym of absorption band.
Absorption Optical System An optical system
used for measuring molecular boundary movement
in a solution during the centrifugation or electrophoresis.
Absorption Ratio The ratio of the concentration
of a substance in solution to its absorptivity.
Absorption Spectrometry The process of measuring
absorption spectrum of a substance with a
spectrometer.
Absorption Spectrum The extent to which a
substance absorbs light of different wavelengths. It
can be obtained by plotting the absorbance of a
substance at different wavelengths.
Absorptive Lipemia Transitory accumulation of
excessive lipid in the blood following the ingestion
of lipid.
Absorptivity
Abstergent
property.
See absorption coefficient.
Having the cleaning or purgative
Abstraction The removal of either an atom or an
electron from a compound.
Abstriction The formation of spores in fungi by
successive cutting of sections of the sporophore
and the development of end wall or septum at the
constriction point.
Abterminal
center.
Abu
A 2 bu
Moving from the end toward the
Abbreviation for aminobutyric acid.
Abbreviation for 2,4-diaminobutanoic acid.
ABV Abbreviation for a combination drug containing
adriamycin, bleomycin and velban.
Abz Abbreviation for aminobenzoic acid or
aminobenzyl.
Abzymes Nonenzyme substances that are capable
of catalytic activity, e.g., catalytic antibody or catalytic
RNA.
AC Abbreviation for 1. A combination drug containing
adriamycin and cyclophosphamide. 2. Adenylate
cyclase or adenylyl cyclase. 3. Alternating
current. 4. Anti-cholinergic. 5. Anticoagulant. 6.
Anti-complementary. 7. Artificial chromosome.
Ac 1. Abbreviation for an Acetyl group or
CH 3 CO – radical. 2. Symbol for the chemical element
Actinium (atomic weight 227, valence 2).
AC Calorimetry A technique for the measurement
of heat capacity of the sample on both cooling
and heating and monitoring of its isothermal
time-dependence.
ACA A genetic code (codon) for the amino acid
threonine.
7-ACA (7-aminocephalosporanic acid, mol wt
272) Hydrolytic product of the antibiotic cephalosporin
C, a potent inhibitor of bacterial β-lactamase.
H2N
O
N
S
O
CH 2OCCH 3
COOH
AcaI (AsuII) A restriction endonuclease isolated
from Anabaena catenula with the following specificity:
5′..........TTCGAA..........3′
3′..........AAGCTT..........5′
AcaII (BamI) A restriction endonuclease from
Anabaena catenula having the same specificity as
BamHI.
AcaIII (MstI) A restriction endonuclease from
Anabaena catenula with the following specificity:
5′..........TGCGCA..........3′
3′..........ACGCGT..........5′
AcaIV (HaeIII) A restriction endonuclease from
Anabaena catenula with the following specificity:
5′..........GGCC..........3′
3′..........CCGG..........5′
Acacia 1. A genus of leguminous shrubs or trees
consisting of several economically and medically
important species, e.g., A. senegal yielding acacia
(gum arabic) and A. catechu producing catechu.
2. Gum arabic, the dry gummy exudate from the
stems and branches of A. senegal and other African
species of Acacia.
Acacic Acid (mol wt 489) A compound isolated
from pods of Acacia concinna.
HO
H 3C
H3C
H
H3C
H
CH3
H
CH3
H 3C
CH3
OH
COOH
OH