| 释义 |
zwitterionenUK
zwit·ter·i·on Z0030000 (zwĭt′ər-ī′ən, swĭt′-, tsvĭt′-)n. A molecule, especially an amino acid, containing a positively charged ion at one end and a negatively charged ion at the other.
[German : Zwitter, hybrid (from Middle High German zwitarn, from Old High German, from zwi-, twice; see dwo- in Indo-European roots) + Ion, ion (from Greek; see ion).]
zwit′ter·i·on′ic (-ī-ŏn′ĭk) adj.zwitterion (ˈtsvɪtərˌaɪən) n (Chemistry) chem an ion that carries both a positive and a negative charge[C20: from German Zwitter hermaphrodite + ion] zwitterionic adjzwit•ter•i•on (ˈzwɪt ərˌaɪ ən, ˈswɪt-, ˈtsvɪt-)
n. an ion with both a positive and a negative charge. [< German Zwitterion (1897) =Zwitter hybrid, hermaphrodite + Ion ion] TranslationszwitterionenUK
zwitterion[′tsfid·ər‚ī‚än] (chemistry) dipolar ion zwitterionenUK
ion [i´on] an atom or group of atoms having a positive (cation) or negative (anion) electric charge by virtue of having gained or lost an electron; substances forming ions are called electrolytes. adj., adj ion´ic.dipolar ion an ion that has both positive and negative regions of charge.hydrogen ion the positively charged hydrogen" >hydrogen atom (H+), which is the positive ion of all acids" >acids. See also hydrogen ion concentration.hydroxyl ion the negatively charged group, OH−, present to excess in alkaline solutions. Fig. 318 Zwitterion . Molecular structure of (a) undissociated amino acid, (b) Zwitterion. zwitterion the chemical form of an AMINO ACID with a dipolar ion state. The pH at which the amino acid exists as a zwitterion is called its ISOELECTRIC POINT and at this pH it will not migrate in an electric field, produced, for example, by ELECTROPHORESIS.ThesaurusSeeion |