1. 
   Zwitterion
   'Zwitter' is german for 'hybrid', and zwitterions are chemical species that manage to be both cations and anions at the same time. How can this come about? Consider ammonium acetate (NH4CH3COO). It is a perfectly ordinary salt, and when dissolved in water splits into its two constituent ions, NH4+ a...
   Found op http://www.kcpc.usyd.edu.au/discovery/glossary-all.html
   
   
2. 
   Zwitterion
   Zwitterion is an ion that has both a positive and a negative charge, such as an amino acid in neutral solution.
   Found op http://www.probertencyclopaedia.com/browse/GZ.HTM
   
   
3. 
   Zwitterion
   A particle that contains both positively charged and negatively charged groups. This results in a net charge of zero.Such as an amino acid in neutral solution.amino acids (NH₂-CHR-COOH) can form zwitterions (+NH₃-CHR-COO-)
   Found op http://www.diracdelta.co.uk/science/source/z/w/zwitterion/source.html
   
   
4. 
   zwitterion
   A particle that contains both positively charged and negatively charged groups. For example, amino acids (NH₂-CHR-COOH) can form zwitterions (⁺NH₃-CHR-COO^-)
   Found op http://antoine.frostburg.edu/chem/senese/101/glossary/z.shtml
   
   
5. 
   Zwitterion
   An ion that has a positive and negative charge on the same group of atoms. It is also called dipolar ion.
   Found op http://www.chemicalglossary.net/definition/1636-Zwitterion
   
   
6. 
   Zwitterion
   Natural state of free amino acids in which a-amino group is protonated giving a positive charge and a carboxyl group is deprotonated giving a negative charge.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
7. 
   zwitterion
   <chemistry> A zwitterion is a dipolar ion that is capable of carrying both a positive and negative charge simultaneously. ... The best example of this are amino acids which have a basic NH2 group and an acidic COOH group. What usually happens is that the H from the COOH group (carboxylic acid ...
   Found op http://www.mondofacto.com/facts/dictionary?zwitterion
   
   
8. 
   zwitterion
   (tsvit´er-i″on) an ion that has both positive and negative regions of charge; called also dipolar ion.
   Found op http://www.encyclo.co.uk/local/21001
   
   
9. 
   zwitterion
   (from the article `liquid`) ...in physiology. Many molecules that occur in biological systems bear electric charges; a large molecule that has a positive electric charge at one ...
   Found op http://www.britannica.com/eb/a-z/z/12
   
   
10. 
    Zwitterion
    In chemistry, a zwitterion (n {respell|TSVIT|ər-eye-ən}; from German zwitter ˈtsvɪtɐ "hybrid") is a neutral molecule with a positive and a negative electrical charge (n.b. not dipoles) at different locations within that molecule. Zwitterions are sometimes also called inner salts. ==Examples== ...
    Found op http://en.wikipedia.org/wiki/Zwitterion
    
    
11. 
    zwitterion
    Ion that has both a positive and a negative charge, such as an amino acid in neutral solution. For example, glycine contains both a basic amino group (NH₂) and an acidic carboxyl group (COOH); when these are both ionized in aqueous solution, the acid group loses a proton while the amino g...
    Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0031178.html
    
    

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