Triplet


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triplet

1. one of three offspring born at one birth
2. Music a group of three notes played in a time value of two, four, etc.
3. Chem a state of a molecule or free radical in which there are two unpaired electrons
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Triplet

 

in biology, a unit of three successive nucleotides in a nucleic-acid molecule. In messenger ribonucleic acids (mRNA), triplets form codons, which code the sequence of amino acids in proteins. Certain triplets in the mRNA molecule also determine the beginning (initiatory codons) and end (terminating codons) of the synthesis of polypeptide chains of proteins in ribosomes. In molecules of transport RNA (tRNA), triplets form anticodons. The interaction of a codon with an anticodon triplet of tRNA that is bonded to an amino acid specific for the given codon is a key element in the translation of genetic information. This interaction takes place in accordance with the principle of the complementarity of heterocyclic bases; the interacting triplets form a double helix. The two successive pairs of bases in a codon-anticodon complex are always strictly complementary (Watson-Crick rule), but there may be a deviation from this rule in the third pair (F. Crick’s theory of dissimilar correspondence).

REFERENCE

Stem, G. Molekuliamaia genetika. Moscow, 1974. Chapters 8, 18. (Translated from English.)

A. A. BOGDANOV


Triplet

 

in spectroscopy, a group of three spectral lines that is observed in an atomic or molecular spectrum. Triplets occur upon quantum transitions between triplet levels of atoms and molecules (seeMULTIPLICITY). Triplets are also observed in the normal Zeeman effect.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

triplet

[′trip·lət]
(genetics)
A three-base unit in deoxyribonucleic or ribonucleic acid which codes for a particular amino acid in a protein chain.
(navigation)
A group of three synchronous transmitting stations operating as a system to provide signals for determination of position. Also known as triad.
(optics)
A compound lens made up of three components.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Upon the birth of triplets, families in Latvia are entitled to a one-time allowance paid by the Welfare Ministry from the contingency funds.
Then N is called a neutrosophic triplet set if for any a [member of] N, there is a neutral of "a" called neut(a), different from the classical algebraic unitary element, and an opposite of "a" called anti(a), with neut(a) and anti(a) belonging to N, such that:
"Since REVLIMID in combination with dexamethasone is already a standard of care in multiple myeloma, we're excited by the prospect of a new REVLIMID-based triplet option for previously untreated patients who are not eligible for transplant."
A 36-year-old woman, gravida 4, para 0, was referred to our Obstetrics and Gynecology Department in a tertiary hospital with suspicion of conjoined twins in a monochorionic triplet pregnancy at 13+5 weeks of gestation.
"And many triplet babies do arrive early and need some form of specialist treatment in neonatal intensive care.
Up on scanning with obstetric U/S, there is triplet intrauterine pregnancy, two fundal placentas with two visible dividing membrane.
Clearly, more loss channels are present that reduce the efficiency, and now, triplet state formation plays a role in the charge loss in these materials.
HERE are the world's most identical triplets - three stunning blonde models who lead exactly matching lifestyles.
Comparative outcome study between triplet and singleton preterm newborns.
Although the independent triplet, Erin, was not affected by the shared blood supply, her life could have been in danger if the condition led to an infection in the womb or premature labour, or if the surgery went wrong.
GENEVA, Switzerland -- It is now 20 months since Kaimba Kazi (36) and her five days old triplets arrived in Zambia's Kenani transit centre in Nchelenge District, Luapula province after fleeing war from Moba in the Democratic Republic of the Congo (DRC) where she lived with her family and husband before getting divorced while pregnant.