The results indicated that the optimum pH value is 7.5 and for the maximum production of biogas temperature should be 37 AdegC.

The initial pH value of the medium can affect the growth and sporulation of the fungus (Madan and Thind, 1998).

A sodium sulphate solution (created by the reaction between caustic soda and the sulphuric acid contained in the amine sulphate) is pumped to one of two storage tanks--with sulphuric acid mixed in on the suction side until the solution reaches a pH value of 7.

When the added amount of Ca[(OH).sub.2] was raised till 10 g/L, the pH value approached 12.9.

Eva's advice is to choose one with a pH value of 5.5 which is slightly acidic, matching the pH of the scalp, and helps prevent the growth of fungi and bacteria.

The changes in the pH value of the preparation during storage time were made to ensure that the pH of the preparation was stable during storage and entered the appropriate pH value range for a lotion preparation.

A total of 1 g of dangke was used for the evaluation of total microbial count and the pH value, while for the evaluation of hardness, dangke was cut into a rectangular shape measuring 2.5 x 1 x 1 cm.

The absence of the pH value on the soap labels made comparison with our results difficult.

As the pH value of the solution departs from the Iso Electric Point (IEP) of particles the colloidal particles get more stable and ultimately modify the thermal conductivity of the fluid.

According to Uttarakhand state government lab report, the pH value - which measures the alkalinity of water soluble substances - was found to be less than the prescribed limit in the amla juice.