| 21. | Tri-methylation in this case would introduce a fixed positive charge on the tail.
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| 22. | :Zn2 + has a positive charge, and is a good electrophile.
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| 23. | Or does the delocalised positive charge, etc . make it react like amides?
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| 24. | Lysine is an amino acid with a positive charge when unmodified.
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| 25. | This positive charge comes from protonation of its free amino groups.
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| 26. | Suppose, therefore, that the right bucket has a small positive charge.
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| 27. | The resulting atoms, with a net positive charge, are known as an ions.
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| 28. | The increased positive charge within the cell now causes the potassium channels to open.
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| 29. | This transport results in two positive charges being displaced across the membrane per cycle.
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| 30. | When the molecule breaks up the positive charge is never on the helium atom.
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