Kinetic evaluation of biobutanol production by Clostridium Bejerincki using hydrolysate of pretreated lemongrass waste by Md. Salleh, Madihah, Abdul Aziz, Suraini, Hua, Yeh Li, Ramanathan, Shankar

“…The optimum conditions for biobutanol production was determined at pH 5.5, temperature 35°C and initial reducing sugar concentration of 40 g/L. …”

Optimization of biohydrogen production by Enterococcus SP. NF6 using starch as substrate by N. Baniear Salvam, Dharsigah

“…The highest biohydrogen production obtained at pH 5.5, incubation temperature of 37°C, and initial substrate concentration of 1g/L. …”
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Electrophoretic deposition of PVA coated hydroxyapatite on 316L stainless steel by Iqbal, Nida, Nazir, Rabia, Asif, Anila, Chaudhry, Aqif Anwar, Akram, Muhammad, Goh, Yi Fan, Akram, Aftab, Amin, Rashid, Sung, Ha Park, Hussain, Rafaqat

“…Deposition was carried out in a methanol suspension at pH 5.5 using a graphite rod as an anode. Parameters such as PVA concentration, deposition voltage and time were optimized to achieve a homogeneous, crack-free adhesive coating. …”

Performance of low pressure reverse osmosis membrane treating synthetic natural organic matter (NOM) and endocrine disrupting chemical (EDC) by Md. Din, Mohd. Fadhil, Shahperi, R., Chelliapan, Shreeshivadasan

“…However, when the membrane system was operated at elevated pressure and low pH (120 psi and pH 5.5), the DDT and glocose removal efficiencies decreased to 91.2 and 75.5%, respectively, indicating operating pressure and pH affected the performance of the system. …”

Utilization of Trametes versicolor for the production of laccase and its application in oxytetracycline degradation from wastewater by Suboh, Siti Fatimah, Mohd. Setapar, Siti Hamidah, Alshammari, Mohammed B., Ahmad, Akil

“…The optimum concentration of OPEFB and pH for the submerged culture of T. versicolor were obtained at 30 g/L and pH 5.5, respectively. OPEFB can be fully utilized as a medium for the growth of T. versicolor thus, the wasteland can be minimized. …”

Fe2O3/Chitosan coated superparamagnetic nanoparticles supporting lipase enzyme from Candida Antarctica for microwave assisted biodiesel production by Kamel Ariffin, Maryam Farhana, Idris, Ani

“…The immobilized lipase complex was able to withstand a wide range of acidic to alkaline environment from pH 5.5 to pH 9.5. The enzyme retains more than 59% of its activity after 14 days of storage and can be recycled for more than 7 cycles with remaining high activity at 93.7%. …”

Characterization of Thiomonas delicata arsenite oxidase expressed in Escherichia coli by Teoh, W. K., Salleh, F. M., Shahir, S.

“…Aio catalysis was optimum at pH 5.5 and 50–55 °C. Aio exhibited stability under acidic conditions (pH 2.5–6). …”

Starch degradation and biohydrogen generation by Bacillus sp. SSA by Aziz, Fatin Syuhadah

“…The maximum biohydrogen production was obtained at temperature 30ºC, pH 5.5 and initial substrate concentration 1.0 g/L with a total value of 0.141 mL. …”
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Effects of pH and temperature on the growth and ß-glucosidase activity of lactobacillus rhamnosus NRRL 442 in anaerobic fermentation by Kok, F. S., Muhamad, Ida Idayu, Lee, Chew Tin, Razali, Firdausi, Pa’e, N., Salleh, Shaharuddin

“…Significant improvement of cell growth was found at higher pH (5.5-6.5). The cell exhibited the highest growth rate at pH 6 and highest β-glucosidase activity (30.09 ± 0.16 UE, 4.16 times β-glucosidase activity in uncontrolled fermentation). …”

Novel microwave-assisted multiwall carbon nanotubes enhancing Cu (II) adsorption capacity in water by Mubarak, N. M., Sahu, J. N., Abdullah, E. C., Jayakumar, N. S.

“…The statistical analysis reveals that the optimum conditions for the highest removal (99.9%) of Cu (II) are at pH 5.5, MWCNTs dosage 0.1 g, contact time 35 min and agitation speed of 160 rpm. …”

Utilization of palm kernel cake as a renewable feedstock for fermentative hydrogen production by Azman, N. F., Abdeshahian, P., Kadier, A., Shukor, H., Al Shorgani, N. K. N., Hamid, A. A., Kalil, M. S.

“…The study showed that the optimum conditions for the biohydrogen production were 30.57 °C temperature, pH 5.5 and 20% inoculum size. A verification experiment was performed in the optimum conditions determined. …”

Accelerated two-stage bioprocess for hydrogen and methane production from palm oil mill effluent using continuous stirred tank reactor and microbial electrolysis cell by Krishnan, Santhana, Md. Din, Mohd. Fadhil, Mat Taib, Shazwin, Nasrullah, Mohd., Mimi Sakinah, Mimi Sakinah, A. Wahid, Zularisam, Kamyab, Hesam, Chelliapan, Shreeshivadasan, Rezania, Shahabaldin, Singh, Lakhveer

“…CSTR reactor was operated at pH 5.5, 80 rpm, 2 days HRT, 60 g COD L-1 d-1 organic loading rate (OLR) and 55 °C temperature with the given hydrogen yield of 205 ml H2 gCOD-1 along with acetic, butyric, propionic, and lactic acid as by-products. …”

Bioprocess optimization for exopolysaccharides production by ganoderma lucidum in semi-industrial scale by Abd. Alsaheb, Ramzy, Koh, Zwin Zjeh, Abd. Malek, Roslinda, Abdullah, Jaafar Kamil, El Baz, Ashraf, El Deeb, Nehal, Dailin, Daniel, Hanapi, Siti Zulaiha, Sukmawati, Dalia, El Enshasy, Hesham

“…Results: The results clearly demonstrated that the best cultivation strategy was cultivation under controlled pH conditions (pH 5.5). Under this condition, the maximal volumetric and specific yield of EPS production were, 5.0 g/L and 0.42 g/g, respectively. …”

Adsorption and desorption of curcumin by poly(vinyl) alcohol-multiwalled carbon nanotubes (PVA-MWCNT) by Zawawi, N. A., Majid, Z. A., Rashid, N. A. A.

“…Cur desorbed significantly (25–30%) from PVA-MWCNT at pH 5.5 than that of pH 7.4, with a sustained release over 3 days of incubation. …”

Effect of heat pre-treatment on biohydrogen production by starch-degrading bacteria by Mohd. Aris, Siti Amirah

“…Batch tests were conducted to investigate and compare biohydrogen formation of untreated and pre-treated sludge at 80oC, 90oC and 100oC over 96 hours utilising cassava starch wastewater as substrate with an initial pH 5.5 at 30oC. Based on the experimental results, only hydrogen and carbon dioxide was detected throughout the experiment without the presence of methane. …”
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Optimization of biobutanol production by clostridium species upm-a1 with liquid central composite design (ccd) by Galadima, Ahmed Ibrahim

“…The experiments were conducted in accordance with the conditions provided by the software, during which highest biobutanol production was attained at run three with temperature 42.50°C, yeast extract 2.14g/L, pH 5.5, and a total biobutanol concentration value of 0.441 g/L. …”
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Kinetics of cell growth and invertase production by the biotherapeutic yeast, Saccharomyces boulardii by El Enshasy, H. A., Elsayed, E. A.

“…Further improvment in the production process was achieved in pH-controlled bioreactor culture (pH 5.5). The maximal invertase production in the controlled culture was increased up to 14830 U L-1 concomitant with a significant increase in biomass up to 7.5 g L-1. …”
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Biohydrogen generation by dark fermentation of starch using bacteria isolated from tapioca wastewater by Ayoub, Lily Suhana

“…The starter culture medium contained tapioca starch at an initial concentration of 1.0 g/L, initial pH 5.5 with incubation carried out at 30°C. Acinetobacter sp. …”
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The effect of soilless media and foliar application on the growth and yield of solanum lycopersicum by Musa, Siti Fatimah Masturah, Baharulrazi, Norfhairna, Che Man, Siti Hajjar, Mohd Suhaini, Azizul, Wan Ahmad Sofian, Wan Sarah Qistina, Ahmad Yasin, Norhidayah, Yunus, Nor Alafiza

“…Based on the results, the pH for all media formulations was consistent within the range of pH 5.5 – pH 6.8. The highest marketable yield, 1,628.5 g, was produced by R50 with a size greater than 24 mm. …”

Effects of palm oil mill effluent anaerobic sludge pretreatment temperature on biohydrogen production and the inoculum microbial community by Dzulkarnain, Eka Latiffah Nadia

“…Biohydrogen production was evaluated under batch fermentation (30°C, initial pH 5.5-6.0, 180 rpm). Shotgun metagenomics analysis was carried out on the raw, untreated and treated sludge inoculum after fermentation. …”
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