• Webster's Revised Unabridged Dictionary
    • n Leucin lū"sĭn (Physiol. Chem) a naturally occurring alpha-amino acid (CH3)2CH.CH2.CH(NH2)-COOH), one of the building units of almost all proteins of living organisms, both animal and vegetable. It is one of the essential amino acids (not synthesized by the human body, a required component for proper nutrition), and is hydrophobic in character when bound in proteins. In isolated form it is a white, crystalline, zwitterionic substance formed, e. g. by the decomposition of proteins by pancreatic digestion, by the action of boiling dilute mineral acid, or by putrefaction. Chemically it is to be considered as amido-caproic acid. It occurs as two optical isomers, the L- and D-forms. The L-form, L-leucine, is the natural form, present in most proteins.
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Century Dictionary and Cyclopedia
    • n leucin A white pulverulent substance, amido-caproic acid (C6H11O2NH2), obtained by treating muscular fiber with sulphuric acid, and afterward with alcohol. It crystallizes in shining scales. It is one of the principal products of the decomposition of nitrogenous matter, and occurs normally in various tissues and fluids of the body, being also a product of the pancreatic digestion of the proteids. Also called aposepidin.
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Webster's Revised Unabridged Dictionary
Gr. leyko`s white


In literature:

He came down by slow marches towards Alexandria, and crossed the canal at Leucine, four miles from the city.
"History Of Egypt From 330 B.C. To The Present Time, Volume 10 (of 12)" by S. Rappoport
Leucine, 115, 168, =177=.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
Bile-acids have been detected (Carter and Schmidt), and also leucin and tyrosin (Pribram and Robitschek).
"A System of Practical Medicine by American Authors, Vol. I" by Various

In news:

Branched-chain amino acids are essential amino acids (specifically, valine, leucine and isoleucine).
Branched -chain amino acids are essential amino acids (specifically, valine, leucine and isoleucine).
Which is actually the name of a giant protein called Titin -- begins with "Methio," ends with "leucine," and has a total of 189,819 letters, Geekologie.com reported.
Branched-chain amino acids (BCAAs) have repeatedly been proven to aid recovery and muscle protein synthesis, and leucine in particular appears to play a big role in these functions.

In science:

The handedness of EE depends on the handedness of the CPL. Even elliptically-polarized light can induce asymmetric photolysis with a lesser degree than CPL [129]. In 2005, the amino acid leucine in the solid state was photolysed by UV CPL in vacuum, while other experiments were often performed in solutions [130].
Recent Progress in Chirality Research Using Circularly Polarized Light
For the two proteins containing the CUE domain, this indicates that the first identically aligned leucines are structurally conserved, and in fact this position is part of a motif for binding ubiquitin that consists of an invariant proline and two highly conserved leucines .
CSA: Comprehensive comparison of pairwise protein structure alignments
Translational error can be studied using this protocol if, in addition to cognate aa-tRNAP he , near-cognate aa-tRNALeu is also supplied because the latter is cognate for the codon CUU which codes for Leucine (abbreviated L).
Template-directed biopolymerization: tape-copying Turing machines
An interesting coincidence found in Račocević’s CIPS concerns the three sextets serine leucine and arginine for which it appears that their class number or position “P” coincides exactly with the number of carbon atoms in their sidechainsS: 1, L: 4, R: 4 (see Table 2).
A taylor-made arithmetic model of the genetic code and applications