“zwitterion”的概念、定义、翻译、参考文献-科学参考

zwitterion

Physics

An ion that has a positive and negative charge on the same group of atoms. Zwitterions can be formed from compounds that contain both acid groups and basic groups in their molecules. For example, aminoethanoic acid (the amino acid glycine) has the formula H₂N.CH₂.COOH. However, under neutral conditions, it exists in the different form of the zwitterion ⁺H₃N.CH₂.COO⁻, which can be regarded as having been produced by an internal neutralization reaction (transfer of a proton from the carboxyl group to the amino group). Aminoethanoic acid, as a consequence, has some properties characteristic of ionic compounds; e.g. a high melting point and solubility in water. In acid solutions, the positive ion ⁺H₃NCH₂COOH is formed. In basic solutions, the negative ion H₂NCH₂COO⁻ predominates. The name comes from the German Zwitter, meaning hermaphrodite.

Chemistry

An ion that has a positive and negative charge on the same group of atoms. Zwitterions can be formed from compounds that contain both acid groups and basic groups in their molecules. For example, aminoethanoic acid (the amino acid glycine) has the formula H₂N.CH₂.COOH. However, under neutral conditions, it exists in the different form of the zwitterion ⁺H₃N.CH₂.COO⁻, which can be regarded as having been produced by an internal neutralization reaction (transfer of a proton from the carboxyl group to the amino group). Aminoethanoic acid, as a consequence, has some properties characteristic of ionic compounds; e.g. a high melting point and solubility in water. In acid solutions, the positive ion ⁺H₃NCH₂COOH is formed. In basic solutions, the negative ion H₂NCH₂COO⁻ predominates. The name comes from the German zwei, two.

Biology

An ion that has a positive and negative charge on the same group of atoms. Zwitterions can be formed from compounds that contain both acid groups and basic groups in their molecules. For example, the amino acid glycine has the formula H₂N.CH₂.COOH. However, under neutral conditions, it exists in the different form of the zwitterion ⁺H₃N.CH₂.COO⁻, which can be regarded as having been produced by an internal neutralization reaction (transfer of a proton from the carboxyl group to the amino group). Glycine therefore has some properties characteristic of ionic compounds, e.g. a high melting point and solubility in water. In acid solutions, the positive ion ⁺H₃NCH₂ COOH is formed. In basic solutions, the negative ion H₂NCH₂COO⁻ predominates. The name comes from the German zwei, two.

单词	zwitterion
释义	zwitterion Physics An ion that has a positive and negative charge on the same group of atoms. Zwitterions can be formed from compounds that contain both acid groups and basic groups in their molecules. For example, aminoethanoic acid (the amino acid glycine) has the formula H₂N.CH₂.COOH. However, under neutral conditions, it exists in the different form of the zwitterion ⁺H₃N.CH₂.COO⁻, which can be regarded as having been produced by an internal neutralization reaction (transfer of a proton from the carboxyl group to the amino group). Aminoethanoic acid, as a consequence, has some properties characteristic of ionic compounds; e.g. a high melting point and solubility in water. In acid solutions, the positive ion ⁺H₃NCH₂COOH is formed. In basic solutions, the negative ion H₂NCH₂COO⁻ predominates. The name comes from the German Zwitter, meaning hermaphrodite. Chemistry An ion that has a positive and negative charge on the same group of atoms. Zwitterions can be formed from compounds that contain both acid groups and basic groups in their molecules. For example, aminoethanoic acid (the amino acid glycine) has the formula H₂N.CH₂.COOH. However, under neutral conditions, it exists in the different form of the zwitterion ⁺H₃N.CH₂.COO⁻, which can be regarded as having been produced by an internal neutralization reaction (transfer of a proton from the carboxyl group to the amino group). Aminoethanoic acid, as a consequence, has some properties characteristic of ionic compounds; e.g. a high melting point and solubility in water. In acid solutions, the positive ion ⁺H₃NCH₂COOH is formed. In basic solutions, the negative ion H₂NCH₂COO⁻ predominates. The name comes from the German zwei, two. Biology An ion that has a positive and negative charge on the same group of atoms. Zwitterions can be formed from compounds that contain both acid groups and basic groups in their molecules. For example, the amino acid glycine has the formula H₂N.CH₂.COOH. However, under neutral conditions, it exists in the different form of the zwitterion ⁺H₃N.CH₂.COO⁻, which can be regarded as having been produced by an internal neutralization reaction (transfer of a proton from the carboxyl group to the amino group). Glycine therefore has some properties characteristic of ionic compounds, e.g. a high melting point and solubility in water. In acid solutions, the positive ion ⁺H₃NCH₂ COOH is formed. In basic solutions, the negative ion H₂NCH₂COO⁻ predominates. The name comes from the German zwei, two.
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