Authors:Z. Khalil, M. Asker, S. El-Sayed and I. Kobbia
Anon, A. (1983):
Effect of pH on Dunaliella bardawil biomass and production of carotenoids
. — New Quarterly, Sanitary Engineering and Environmental Health Research Laboratory, Univ. California, Berkeley, 33 pp
Authors:S. Oulkheir, Khadija Ounine, N. Elhaloui, A. Douira, Latifa Ikko, Saadia Bricha and B. Attarassi
Clavero, M. R. S., Beuchat, L. R.: Survival of
O157:H7 in broth and processed salami as influenced by pH, water activity, and temperature and suitability of media for its recovery. Appl Microbiol
, 2735–2740 (1996
Authors:Jeevitha Murugesh, Rajeshwari G. Annigeri, Syed Ahmed Raheel, Saleh Azzeghaiby, Mohammad Alshehri and Omar Kujan
, Gholizadehpasha A , Zahedpasha S , Moghadamnia Y , Zamaninejad S , Moghadamnia A : Effect of yoghurt and pH equivalent lemon juice on salivary flow rate in healthy volunteers –an experimental crossover study
Authors:S. Mahmood, I. Hussain, A. Ashraf, A. Parveen, S. Javed, M. Iqbal and B. Afzal
Alkaline and acidic pH of soil limit crop yield. Products of phenylpropanoid pathway play a key part in plant abiotic stress tolerance. It was aimed to assess efficacy of tyrosinepriming for activation of enzyme involved in phenolic accumulation induction of pH tolerance in maize seedlings. Seeds of two maize cultivars, namely Sadaf (pH tolerant) and S-2002 (pH sensitive), were grown under three pH levels (3, 7 and 11). Eight and twelve days old seedlings were harvested and parted into roots and shoots for the assessment of growth, enzymatic and non-enzymatic antioxidants. PAL activity was directly correlated with total soluble phenolics, flavonoids, growth and seedling vigour. Lower accumulation of phenolics and PAL activity in the pH sensitive (S-2002) cultivar indicated greater oxidative damage caused by pH extremes. Priming improved antioxidative potential by enhancing PAL activity and phenolics accumulation and hence increased growth in maize seedlings.
This work contributed to the adsorption of radiocobalt on goethite as a function of contact time, pH, ionic strength and foreign
ions in the absence and presence of fulvic acid (FA) under ambient conditions. The results indicated that adsorption of Co(II)
was dependent on ionic strength and foreign ions at low pH values (pH < 7.8), and independent of ionic strength and foreign
ions at high pH values (pH > 7.8). Outer-sphere surface complexation and/or ion exchange were the main mechanisms of Co(II)
adsorption on goethite at low pH values, whereas inner-sphere surface complexation was the main adsorption mechanism at high
pH values. The presence of FA enhanced Co(II) adsorption at low pH values, but reduced Co(II) adsorption at high pH values.
The thermodynamic data (ΔH0, ΔS0, ΔG0) were calculated from the temperature dependent adsorption isotherms, and the results suggested that adsorption process of
Co(II) on goethite was spontaneous and endothermic. The results are crucial to understand the physicochemical behavior of
Co(II) in the nature environment.
Authors:Lei Chen, Bin Gao, Songsheng Lu and Yunhui Dong
Sorption of radionickel on attapulgite is studied as a function of contact time, ionic strength, pH and temperature. The results
indicate that the sorption of Ni(II) on attapulgite is strongly ionic strength-dependent at pH <8, and independent of ionic
strength at pH >8. Outer-sphere surface complexation or ion exchange contributes to Ni(II) sorption on attapulgite at pH <8,
whereas the sorption of Ni(II) is mainly dominated by inner-sphere surface complexation at pH >8. The sorption of Ni(II) on
attapulgite increases with increasing temperature, and the thermodynamic parameters (ΔH0, ΔG0 and ΔS0) calculated from the temperature dependent sorption isotherms suggest that the sorption of Ni(II) on attapulgite is a spontaneous
and endothermic process. The high sorption capacity of attapulgite suggests that attapulgite is a suitable material for the
preconcentration and solidification of radionickel from large volumes of aqueous solutions.