NH4+ | definition of NH4+ by Medical dictionary
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an ion formed by the reaction of ammonia (NH3) with a hydrogen ion (H+). The ammonium ion is highly soluble in water but does not pass easily through cell membranes, as does the ammonia molecule, and its rate of excretion is influenced in part by the acidity of urine. The lower the pH, the greater the proportion of ammonium ions present, assuming a constant level of ammonia production from amino acid metabolism.
The univalent ammonium radical.
References in periodicals archive
The effect of NH4+ application on K+/Na+ ratio and dry matter resulted in a decrease of K+/Na+ ratio and dry matter at 10 mM NH4+ as compared to 5 mM NH4 concentration (Fig.
Results of ionic parameters showed that the effect of potassium was significant regarding NH4+ nutrition.
different phenomena which include (1) reduce NH + influx (2) reduce Na+ influx (3) act as osmolyte (4) maintain cellular pH as NH4+ decrease cellular pH (5) act as enhancing GS activity in NH4 sensitive species like barley and maize (Balkos et al.