PH is dissolved in water, the pH will be greater than 7. A solution of a strong acid, such as hydrochloric acid, at concentration 1 mol dm has a pH of 0. A solution of a strong alkali, such as sodium hydroxide, at concentration 1 mol dm, has a pH of 14. Thus, measured pH values will lie mostly in the range 0 to 14, though negative pH values and values above 14 are entirely possible. Since pH is a logarithmic scale, a difference of one pH unit is equivalent to a tenfold difference in hydrogen ion concentration. <br> The pH
6TMS neutral amino acid transporter family the Transporter Classification Database. A gene encoding a small neutral amino acid transporter was cloned from the genome of the hyperthermophilic archaeon "Thermococcus" sp. KS-1. The cloned gene, "snatA", encodes a protein of 216 amino acid residues, SnatA (TC# 2.A.95.1.4), with six membrane-spanning segments (TMSs). Competition studies indicated that SnatA transports various L-type neutral amino acids. It has also been noted that glycine transport is inhibited by a protonophore, FCCP, or valinomycin plus nigericin, indicating that the process is dependent on an electrochemical potential of H. The generalized reaction catalyzed by SnatA is:Amino acid (in) → Amino acid (out) MarC