furanose การใช้

• It is the opposite in an-configuration furanose.
• If it does bind the furanose ring, it next opens the ring.
• G5 hydrogen bonds to the furanose oxygen of C17, helping to position it for in-line attack.
• The furanose ring will have either alpha or beta configuration, depending on which direction the anomeric hydroxy group is pointing.
• In a-configuration furanose, alpha configuration has the hydroxy pointing down, and beta has the hydroxy pointing up.
• With hexoses, short reactions times usually lead to furanose ring forms, and longer reaction times lead to pyranose forms.
• A furanose ring structure consists of four carbon and one oxygen atom with the anomeric carbon to the right of the oxygen.
• In aqueous solution ribose is 75 % pyranose and 25 % furanose and a different acetal "'4 "'is formed.
• Both types of pentoses in DNA and RNA are in their ?-furanose ( closed five-membered ring ) form and they define the identity of a nucleic acid.
• The ( much rarer ) reaction between C-1 and C-4 creates a molecule with a five-membered ring, called furanose, after the cyclic ether furan.
• For any single stereoisomer ( there are two enantiomers ), the straight-chain form and the various closed-ring pyranose and furanose forms can easily and rapidly interconvert when dissolved in water.
• In an-configuration furanose, the substituent on the highest numbered chiral carbon is pointed downwards out of the plane, and in a D-configuration furanose, the highest numbered chiral carbon is facing upwards.
• In an-configuration furanose, the substituent on the highest numbered chiral carbon is pointed downwards out of the plane, and in a D-configuration furanose, the highest numbered chiral carbon is facing upwards.
• If the joining of monomers takes place at such a carbon atom, the free hydroxy group of the pyranose or furanose form is exchanged with an OH-side-chain of another sugar, yielding a full acetal.
• Both the furanose and pyranose thiosugars can be prepared from the same thiyl radical precursor; 5-" exo " and 6-" endo " cyclizations of this precursor form the respective desired compound.
• At pH 7, glucose exists in solution in cyclic hemiacetal form as 63.6 % ?-D-glucopyranose and 36.4 % ?-D-glucopyranose, the proportion of linear and furanose form being negligible.
• Glucuronic acid, like its precursor glucose, can exist as a linear ( carboxo-) aldohexose ( D-glucose are capable of forming two furanose forms ( ? and ? ) and two pyranose forms ( ? and ? ).
• :Ring closure in sugars is a type of hemiacetal or hemiketal reaction, see also Furanose which is the 5-membered ring of which you speak .-- 32 " "'18 : 28, 6 November 2009 ( UTC)
• :Insects-at least some of them-have pyranose receptors and furanose receptors; so anything that elicits response from either one will presumably taste to the insect as a corresponding type of sugar .-- talk ) 06 : 39, 31 July 2009 ( UTC)
• In these abbreviated forms, the names of the monosaccharide units are shortened to their corresponding three-letter abbreviations, followed by " p " for pyranose or " f " for furanose ring structures, with the abbreviated aglyconic alcohol placed at the end of the name.