zwitterion

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zwitterion

[′tsfid·ər‚ī‚än]
(chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Caption: FIGURE 3: The exemplary FQ--norfloxacin and its zwitterion structure.
The properties of the zwitterionic polyurethanes were investigated, and it was found that their thermal stability decreased as the content of zwitterions increased.
The limiting case of the [pi]-electron redistribution leads to zwitterionic form of the molecule; however, both zwitterions and neutral forms as a resonance hybrid state can exist in a solution with the different weight ratios of the above forms.
Zwitterions are chemical compounds that have a total net electrical charge of zero but contain positively and negatively charged groups.
and ITIS Montani) has concentrated her attention on ion-pair chromatography, encompassing such aspects as retention modeling, zwitterions and other unusual analytes, and applications to non-separative functions.
Usually, tetracycline occurs predominantly as zwitterions at the typical pH values of the natural environment (Sassman and Lee 2005).
Their model which employs the zwitterions mechanism for the C[O.sub.2]-amine reaction, constant global concentration of amine based species and equal diffusion coefficients was numerically solved.
The dictionary covers a wider range of terms than parasitology; some virology terms, such as Aino virus, are included, as are some far afield terms, including hundredweight, hydrogen half-cell, and zwitterions. These additions add to the level of interest as the reader leafs from page to page looking for familiar friends and making new acquaintances.
These "hills" are possibly composed of mostly the salts of carbamate zwitterions or ammonium bicarbonate, which are the reaction products between C[O.sub.2] of the air and amine curing agent.
Proteins (gelatins) are made up of amino acids, which are zwitterions and can posses either a positive or negative charge based on the pH of the solution.
A possible explanation is that the highly polar zwitterions bonded to the glass-fiber surface, causing the evanescent wave sensor to lose sensitivity.