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Biological Pathways for the Production of Levulinic Acid from Lignocellulosic Resources
Published in Jitendra Kumar Saini, Surender Singh, Lata Nain, Sustainable Microbial Technologies for Valorization of Agro-Industrial Wastes, 2023
Laura G. Covinich, María Cristina Area
4-hydroxyvalerate is produced through the activation of LA by the coenzyme A (CoA), followed by a reduction from a dehydrogenase reductase (Sathesh-Prabu and Lee 2019), and then the 4-hydroxyvalerate is extracellularly secreted because of an intracellular thioesterase (Martin, Wu, and Jones Prather 2010). Besides, the 4-hydroxyvalerate could be further lactonized to yield gamma-valerolactone (Yan, Yang et al. 2015). For 4-hydroxyvalerate production, several strains of Pseudomonas putida (Martin and Prather 2009), Escherichia coli (D. Kim et al. 2019), Alcaligenes faecalis (Yeon, Park, and Yoo 2013), and Ralstonia eutropha (Gorenflo et al. 2001) proved to be successful when using LA as a carbon source. Pseudomonas putida KT2440 (Martínez-García et al. 2014), one of the most used strains, is mainly characterized by its excellent properties of high tolerance to oxidative stress and organic solvents, metabolic diversity features, and minimal formation of unwanted by-products (Nikel and de Lorenzo 2018).
Bioaugmentation of Pesticides-Contaminated Environment
Published in Inamuddin, Charles Oluwaseun Adetunji, Mohd Imran Ahamed, Tariq Altalhi, Bioaugmentation Techniques and Applications in Remediation, 2022
G. Gokulapriya, M. Chandrasekaran, R.P. Soundararajan
Soil pH also has a potent role in pesticide adsorption and degradation. An efficient degradation can be achieved at pH ranges from 5 to 8. If pH of the soil is more, the adsorptive potential of pesticide is low and its availability for microbial degradation will be more (Chowdhury et al., 2008; Lebeau, 2011; Diels and Lookman, 2007; Burns, 1975). Optimum pH is necessary for microorganisms for better growth and development. At lower pH (5.4) degrading potential of Pseudomonas putida was lost, while at pH 6.8 and 8.3 the activity of bacteria was observed in soil (Karpouzas and Walker, 2000). Topp et al. (1997) noted that the sorption potential of prometryn herbicide to montmorillonite clay is more at pH 3 than at pH 7. Degradation of atrazine was efficient at pH greater than 7 (Lebeau, 2011).
Bioprospecting and Bioresources for Next-Generation Biofuel Production
Published in Prakash Kumar Sarangi, Sonil Nanda, Bioprocessing of Biofuels, 2020
Prakash Kumar Sarangi, Sonil Nanda
Basler et al. (2018) have reported on the efflux pump i.e. on native resistance-nodulation-cell division (RND) acting on short-chain alcohols. Pseudomonas putida has gained attention as a potential microorganism in biorefinery owing to diversified catabolism and elaborated stability to various lethal materials (Udaondo et al. 2012). Furthermore, due to the diversity in features such as compliant metabolism, suppleness to noxious substances and flexibility for metabolic engineering, P. putida is considered as the benign microorganism for the fourth-generation biofuels production. P. putida has also the ability for the production of n-butanol after expressing the biosynthetic pathway from Clostridium acetobutylicum (Nielsen et al. 2009). Moreover, the engineered strain of P. putida was employed in a biphasic liquid extraction system to aid in the formation and down streaming of toxic compounds in fermenters (Schmitz et al. 2015; Basler et al. 2018).
Developments in enzyme and microalgae based biotechniques to remediate micropollutants from aqueous systems—A review
Published in Critical Reviews in Environmental Science and Technology, 2022
Zeba Usmani, Minaxi Sharma, Tiit Lukk, Yevgen Karpichev, Vijay Kumar Thakur, Vivek Kumar, Abdelmounaaim Allaoui, Abhishek Kumar Awasthi, Vijai Kumar Gupta
Further studies using multiomics strategies such as transcriptomics, genomics, proteomics, and metabolomics could reveal species and community-specific interactions. The genomics and metagenomics studies have resulted in identification of several genes in different microorganisms which leads to the detection of the enzymes associated with their biotransformation. The genomes of micropollutant degrading strains are quite significant in deploying other omics approaches (Bell et al., 2015; Techtmann & Hazen, 2016). Some of the microbial species that have been studied to remediate pharmaceutical pollutants include Pseudomonas putida XWY-1 (Zhu et al., 2019), Micrococcus sp. strain 2385 (Pathak et al., 2016) and Microbacterium esteraromaticum (Panneerselvan et al., 2018). These genomic studies could be used as the basis to better understand the characteristics of microbial enzymes and their application in bioremediation of micropollutants.
Recovery of Biosurfactant Using Different Extraction Solvent by Rhizospheric Bacteria Isolated from Rice-husk and Poultry Waste Biochar Amended Soil
Published in Egyptian Journal of Basic and Applied Sciences, 2020
S. O. Adebajo, P. O. Akintokun, A. E. Ojo, A.K. Akintokun, O.A. Badmos
The study shows that efficient biosurfactant producers could be recovered from biochar-amended soil of plant (rice-husk) or animal (poultry waste) sources. The result also revealed that rice-husk waste biochar-amended soil harbors efficient biosurfactant producers and effective hydrocarbon degrader. Pseudomonas putida, a gram-negative, rod-shaped bacterium that belongs to the genus of Pseudomonas has proven to be a rhizospheric potent biosurfactant producer, able to produce biosurfactant with an environmental waste (palm oil mill effluent) as a substrate using different recovery solvents. The crude biosurfactant produced has moderate stability and antimicrobial property especially on gram positive bacteria. These finding also suggested the drop collapse method as a suitable primary screening method.
Medium-chain-length poly-3-hydroxyalkanoates-carbon nanotubes composite as proton exchange membrane in microbial fuel cell
Published in Chemical Engineering Communications, 2019
Hindatu Yusuf, M. Suffian M. Annuar, Syed Mohammad Daniel Syed Mohamed, Ramesh Subramaniam
Pseudomonas putida Bet001 (3% v/v) stock inoculum grown in nutrient broth (Merck, Darmstadt, Germany) at 180 rpm, 30 ± 2 °C for 24 h was aseptically introduced into a sterile nutrient-rich medium (100 ml per each 250 ml conical flask) containing (g/L): yeast extract 10.0 (BactoTM, France), nutrient broth 15.0 (Merck) and ammonium sulfate 5.0 (Systerm). The culture was incubated in a shaking incubator (Daihan LabTech, Seoul, Korea) at 30 ± 2 °C, 200 rpm for 24 h. The biomass was harvested via centrifugation at 4 °C, 8000 × g for 5 min (Thermo Scientific Sorvall RC-5C Plus ultracentrifuge, Thermo Fisher Scientific Co., Waltham, MA). The recovered biomass (2 g/L) was aseptically transferred into mcl-PHA production medium (150 ml per 500 ml conical flask) after washing twice with 0.9% w/v saline solution (Gumel et al., 2012b). The medium contained (g/L): NaNH4HPO4•4H2O 3.5, K2HPO4 5.7, KH2PO4 3.7, and 20 mM octanoic acid. Separate sterile solutions of 0.1 M MgSO4•7H2O and trace elements were aseptically added to the mcl-PHA production medium (pH 7.0) at 1.0% (v/v) and 0.1% (v/v), respectively, prior to inoculation (Gumel et al., 2012a). Incubation was carried out for 48 h. Pseudomonas putida cells containing the mcl-PHA were harvested by centrifugation at 8000 × g for 10 min. Residual fatty acid was removed by washing the cells with n-hexane (1:9 weight ratio) before washing twice with saline solution. The biomass was dried in an oven at 70 °C until constant weight.