Optimization of the conditions for rice bran phytate degradation by their own phytases by Farouk, Abd-El Aziem, Ahamed, N. Thoufeek, Meor Hussin, Anis Shobirin, Al Zahrani, Othman, Alotaibi, Saqer

“…Moreover, an increase in phytase activity at the same concentration of rice bran was observed while adjusting the pH at pH 5.5. The four concentrations of rice bran showed gradual increase in activity at 50°C which was directly proportional to the concentrations of rice bran and comparatively better while adjusting the pH at pH 5.5. …”
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Potentiometric Titration of Acid Soils From Peninsular Malaysia by Jusop, Shamsuddin, Tessens, Eddy

“…The buffering action of the soils is dominated by Al below pH 5.5 and by the clay minerals, mainly kaolinite, at pH above pH 5.5. …”
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Microbial characterization of hydrogen producing bacteria in fermented food waste at different pH values by Mohd Yasin, Nazlina Haiza, Abdul Rahman, Nor'aini, Che Man, Hasfalina, Mohd Yusoff, Mohd Zulkhairi, Hassan, Mohd Ali

“…Effective biohydrogen production was found at controlled pH 5.5 and 6.0 corresponding to lower lactic acid production compared to pH 5.0. …”
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Batch process for bio-hydrogen production on small scale bioreactor from palm oil mill effluent (POME) by Ahmadun, Fakhru'l-Razi, Nik Kob, Nik Norfadilah, Harun, Mohd Razif

“…The maximum hydrogen percentage in the biogas was 36% obtained at pH 5.5. Throughout the study, there no methane gas was observed in the evolved gas mixture.…”
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Continuous Production Of Organic Acids From Palm Oil Mill Effluent And Kitchen Garbage by Phang, Lai Yee

“…Three sets of experimental conditions were studied, i.e. at pH 6.8 with RT 5 days, pH 5.5 with RT 5 days and pH 5.5 with RT 2.5 days which produced an average lactic acid concentration of 42 g/L, 53 g/L and 50 g/L respectively. …”
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Acidity and Charge Characteristics of Marine Alluvial Soils from Carey Islands, Selangor by Jusop, Shamsuddin, Paramananthan, S.

“…The soils were highly buffered below pH 5.5 and this was found to be highly correlated to Al content. …”
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Bioconversion of Sago Effluent to Organic Acids by Batch and Continuous Anaerobic Treatment with Pome Sludge as Inoculum by Ong, Ming Hooi

“…The production of organic acids was conducted at different concentrations of sludge (0%, 10%, 20% and 30%), pH (no pH adjustment, controlled constantly at pH 7, manual adjustment to pH 7 every 12 hours, initial pH 5.5 and pH 7) and retention time (5 days and 7.5 days). …”
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Comparison of Municipal and Kitchen Waste Leachates for the Production of Organic Acids and Polyhydroxyalkanoates (PHA) by Hamed, Jame'ah

“…In contrast, with the combined landfill leachate the highest organic acids obtained was only 14 gIL when the pH was controlled at pH 5.5, with acetic acid as the main product. Temperature at 37°C gave the highest production on the second day. …”
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Optimisation of physical parameters and microbial community analysis of bio-hydrogen production from food waste by Mohd Yasin, Nazlina Haiza

“…The results showed that pH 5.5 gave the highest biohydrogen production yield (79 mmol H2/L-medium/d). …”
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Oil palm empty fruit bunch as alternative substrate for acetone–butanol–ethanol production by Clostridium butyricum EB6 by Ibrahim, Mohamad Faizal, Abd. Aziz, Suraini, Abdul Razak, Mohamad Nafis, Phang, Lai Yee, Hassan, Mohd Ali

“…A higher amount of ABE (2.61 g/l) was produced in a fermentation using treated OPEFB as the substrate when compared to a glucose based medium that produced 0.24 g/l at pH 5.5. ABE production was increased to 3.47 g/l with a yield of 0.24 g/g at pH 6.0. …”
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Development of a new recombinant starter culture bacterium for milk coagulation by Raftari, Mohammad

“…Analysis of the mean of the results of milk clotting activity and MCA/PA of purified recombinant MPR protein for the highest purified levels of expressed protein at pH 5.5 and temperatures 30, 33, 27 and 36°C and control showed 870.54, 809.86, 491.85, 358.54 and 651.38 SU/ml for milk clotting activity and 7914, 7362.36, 4471.36, 3259.45 and 5664.17 SU/OD for MCA/PA,respectively. …”
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Biohydrogen Production from Palm Oil Mill Effluent by Locally Isolated Clostridium Butyricum Eb6 by Chong, Mei Ling

“…The effect of pH on biohydrogen production from POME was investigated, with the optimum biohydrogen production ability at pH 5.5. The maximum biohydrogen production and maximum volumetric biohydrogen production rate were at 3195 mL H2/L-medium and 1034 mL H2/L-medium/h, respectively. …”
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Changes in physical and chemical properties of Hemic and Sapric peat influenced by liming and fertilizer application by Abdul Reeza, Ameera

“…Four treatments in triplicates were applied (C) control; (T1) compound fertilizer NPK (12:12:17:2); (T2) dolomite adjusted to pH5.5; (T3) combination of compound fertilizer NPK and dolomite adjusted to pH5.5. …”
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Particle velocity of submicron polystyrene latex and bubble formation in aqueous system under continuous and pulsed direct current by Abu Bakar, N.F., Basaruddin, B., Naim, M. Nazli, Lenggoro, I. Wuled, Iijima, M., Kamiya, H.

“…The velocity of the PSL particles of varied sizes, i.e., 600, 300 and 100 nm at pH 5.5 and electric field strength of 4.1 V/cm were measured using a zeta potential meter under continuous and pulsed DC frequencies of 83.3, 10 and 5 Hz. …”

Factors affecting the accumulation of 9-methoxycanthin-6-one in callus cultures of Eurycoma longifolia. by Rosli, N., Mahmood, Maziah, Chan, K. L., Sreeramanan, S.

“…Higher production of 9-methoxycanthin-6-one was obtained at pH 5.5 (1.53 mg'g-1 DW). Production of 9-methoxycanthin-6-one (2.34 mg'g-1 DW) in callus cultures is also increased when the medium is added with 1×10-1 μM phenylalanine. …”
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Review of affinity precipitation methods by Mustapha, Sa'ari

“…This mathematical model can be useful to analyzing kinetic enzyme in experimental system. 2) Affinity Precipitation using the dimer of nicotinamide-adenine dinucleotide which is proposed by Mosbach and Larsson (1979). 3) Metal Affinity Precipitation of Proteins that bischelates of Cu (II) as macroligands used to precipitate of proteins. 4) Metal Affinity Aggregation of Proteins for aggregating of proteins which obtained via applying classical gelation theory and ion binding equilibrium. 5) Purification of Lectin by Affinity Precipitation is done by mixing extracted lectins from wheat germ, potato and tomato and 2 ml of chitosan solution. 6) Lectins from wheat germ, potato and tomato extracts (1.0 ml clarified extracts containing 21 722, 54 650 and 19 280 units) were added to 2 ml of chitosan solution (0.4% wv21 in 50 mM acetate buffer, pH 5.5). Other methods which are explained 6) Affinity Chromatography for Purification of Enzymes, and 7) Affinity precipitation method using k-carrageenan. …”
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Biohydrogen production by Clostridium butyricum EB6 from palm oil mill effluent by Chong, Mei Ling, Abdul Rahim, Raha, Shirai, Yoshihito, Hassan, Mohd Ali

“…Experimental results showed that the optimum hydrogen production ability occurred at pH 5.5. The maximum hydrogen production and maximum volumetric hydrogen production rate were at 3195 mL H2/L-medium and 1034 mL H2/L-medium/h, respectively. …”
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Biohydrogen production by Clostridium butyricum EB6 from palm oil mill effluent by Chong, Mei Ling, Abdul Rahim, Raha, Shirai, Yoshihito, Hassan, Mohd Ali

“…The effect of pH on hydrogen production from POME was investigated.Experimental results showed that the optimum hydrogen production ability occurred at pH 5.5. The maximum hydrogen production and maximum volumetric hydrogen production rate were at 3195 mL H2/L-medium and 1034 mL H2/L-medium/h,respectively. …”
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Utilisation Of Organic Acids From Anaerobically Treated Palm Oil Mill Effluent With And Without Sludge Recycle For Polyhydroxyalkanoate Production by Sim, Kean Hong

“…Three experiments were conducted in anaerobic treatment of POME until steady state was achieved, i.e. (1) pH 6.5, 30"C, 80 rpm, sludge/POME ratio 1: 1, hydraulic retention time (HRT) 4 days, without sludge recycle and POME was fed continuously; (2) pH 6.5, 30"C, 100 rpm, sludge/POME ratio 1:1, HRT 4 days, without sludge recycle and POME was fed manually three times a day; (3) pH 5.5, 30°C, 150 rpm, sludge/POME ratio 3:7, HRT 4 days, SRT 8.2 days with partially sludge recycled (500 mL) and POME was fed manually three times a day. …”
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Profile of enzymes relevant to solvent production during direct fermentation of sago starch by C. saccharobutylicum at different pH control strategies. by Md Salleh, Madihah, Liew, Shiau Tsuey, Ariff, Arbakariya

“…On the other hand, the highest specific activities of crotonase, β-hydroxybutyryl-CoA dehydrogenase, and phosphotransbutyrylase were observed at pH 5.5 and corresponded to the highest production of ethanol and butanol. …”
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