threose การใช้

• Threose nucleic acid is an artificial genetic polymer invented by Eschenmoser.
• TNA strings composed of repeating threose sugars linked together by phosphodiester bonds.
• Threose nucleic acid ( GNA ), and like PNA, also lack experimental evidence for their respective abiogenesis.
• There are two naturally occurring stereoisomers, the enantiomers of erythrose and threose having the D configuration but not the L enantiomers.
• These specific monosaccharide names have conventional three-letter abbreviations, like " Glu " for glucose and " Thr " for threose.
• "' Threose "'is a four-carbon monosaccharide or carbohydrate with molecular formula C 4 H 8 O 4.
• There are also entire families of Peptide nucleic acid, Threose nucleic acid and Glycerol nucleic acid that are candidates for this kind of behavior.
• As is depicted in a Fischer projection of D-threose, the adjacent substituents will have a anti in the isomer referred to as " erythro ".
• Threose nucleic acid ( PNA ) are also other currently known XNAs that have been made and have more background information currently available than the previous two mentioned.
• Artificial nucleic acids include peptide nucleic acid ( PNA ), Morpholino and locked nucleic acid ( LNA ), as well as threose nucleic acid ( TNA ).
• Examples of aldose include glycolaldehyde, glyceraldehyde, erythrose, threose, ribose, arabinose, xylose, lyxose, allose, altrose, glucose, mannose, gulose, idose, talose, and galactose.
• The prefix " threo " which derives from threose ( and " erythro " from a corresponding diastereomer erythrose ) offer a useful way to describe general organic structures with adjacent chiral centers, where " the prefixes . . . designate the relative configuration of the centers ".
• The threose name can be used to refer to both the D-and L-stereoisomers, and more generally to the racemic mixture ( D / L-, equal parts D-and L-) as well as to the more generic threose structure ( absolute stereochemistry unspecified ).
• The threose name can be used to refer to both the D-and L-stereoisomers, and more generally to the racemic mixture ( D / L-, equal parts D-and L-) as well as to the more generic threose structure ( absolute stereochemistry unspecified ).
• Given Earth's history of meteoric impacts and the observation that meteors contain an excess of the biologically relevant L-proteinogenic alanine can direct the condensation of glycolaldehyde to produce nonracemic solutions of threose and erythrose via an aldol reaction concluding that amino acids can act as asymmetric catalysts in carbohydrate synthesis.