Paraffin Oil-Enhanced Biodegradation of Naphthalene by Hydrogenophaga palleronii LHJ38

2010 ◽  
Vol 113-116 ◽  
pp. 243-249 ◽  
Author(s):  
Jia Ying Xin ◽  
Yan Wang ◽  
Ying Xin Zhang ◽  
Chun Gu Xia
Keyword(s):  
Energy Source ◽  
Aqueous Phase ◽  
Degradation Rate ◽  
Mineral Salt Medium ◽  
Dry Weight ◽  
Salt Medium ◽  
Optimum Conditions ◽  
Naphthalene Degradation ◽  
Paraffin Oil ◽  
Enhanced Biodegradation

Hydrogenophaga palleronii LHJ38 can grow on naphthalene as sole carbon and energy source. The growth and naphthalene degradation curve of the strain were determined in biphase and monophase system respectively. The growth and naphthalene degradation capacity of cells obtained from oil phase and aqueous phase were compared carefully. The maximum biomass of 4.248g/L was obtained after cultivating 72h under the optimum conditions of 30 mL paraffin oil and 2g naphthalene in 1L mineral salt medium. In the biphase system, the naphthalene degradation capacity of Hydrogenophaga palleronii LHJ38 was higher more than 2 times than that in the monophase system. The naphthalene (2g/L) can be degraded completely in 132h when the concentration of cell was 2 mg dry weight cell/mL. The naphthalene degradation rate of cells obtained from oil phase was 2.7 fold as fast as that of cells obtained from aqueous phase.

scholarly journals Removal of tannin from Shea nut cake by Pseudomonas strain

1970 ◽  
Vol 5 (1) ◽  
pp. 17-22
Author(s):  
F.M. Danikuu ◽  
A. Quainoo ◽  
E.N.K. Sowley
Keyword(s):  
Mineral Salt Medium ◽  
Cost Effective ◽  
Sole Source ◽  
Northern Region ◽  
Mineral Salt ◽  
Salt Medium ◽  
Biomedical Sciences ◽  
Nutritional Factors ◽  
Tannin Concentration ◽  
Enhanced Biodegradation

The use of microorganisms to remove the anti-nutritional factors in shea nut cake as the most cost effective and environmentally friendly approach to permit its use in agriculture for animal nutrition and soil fertility is long anticipated. Bacteria isolated from shea nut cake polluted soil in Sagnarigu District of Northern Region of Ghana showed that anti-nutritional factors in shea nut cake are bio-degradable. The bacteria were grown in mineral salt medium supplemented with 2% shea nut cake as sole source of carbon. The bacteria isolate was identified biochemically as Pseudomonas aerugenosa and reduced total tannin concentration in shea nut cake from 54.58 g Kg-1 to 8.71 g Kg-1 (84%) in 10 days and 92% in 20 days. Boiling of shea nut cake reduced tannin content from 54.58 g Kg-1 to 16.36 g Kg-1 (70%) and enhanced biodegradation of tannin in the shea nut cake, removing up to 95% of total tannins in shea nut cake in 20 days.Journal of Medical and Biomedical Sciences (2016) 5(1), 17-22Keywords: Tannins, biodegradability, bacteria, mineral salt medium

scholarly journals Water Stress and Storage-protein Degradation during Germination of Impatiens Seed

1991 ◽  
Vol 116 (2) ◽  
pp. 302-306 ◽  
Author(s):  
Mehrassa Khademi ◽  
David S. Koranski ◽  
David J. Hannapel ◽  
Allen D. Knapp ◽  
Richard J. Gladon
Keyword(s):  
Water Stress ◽  
Storage Proteins ◽  
Dry Weight ◽  
Insoluble Fraction ◽  
Weight Basis ◽  
Optimum Conditions ◽  
Fresh Weight ◽  
Soluble Protein Fraction ◽  
Molecular Weights ◽  
And Storage

Water uptake by impatiens (Impatiens wallerana Hook. f. cv. Super Elfin Coral) seeds was measured as an increase in fresh weight every 24 hours during 144 hours of germination. Seeds absorbed most of the water required for germination within 3 hours of imbibition and germinated at 60% to 67% moisture on a dry-weight basis. Germination started at 48 hours and was complete by 96 hours at 25C. Water stress of -0.1, -0.2, -0.4, and -0.6 MPa, induced by polyethylene glycol 8000, reduced germination by 13%, 49%, 91%, and 100%, respectively, at 96 hours. Under the same water-stress conditions, increases in fresh weight were inhibited by 53%, 89%, 107%, and 106%, respectively. Three distinct groups of storage proteins were present in dry seed; their estimated molecular weights were 1) 35, 33, and 31 kDa; 2) 26, 23, and 21 kDa; and 3) two bands <14 kDa. Major depletion of storage proteins coincided with the completion of germination. Water potentials that inhibited germination also inhibited degradation of storage proteins. During germination under optimum conditions, the soluble protein fraction increased, coinciding with a decrease in the insoluble fraction.

scholarly journals Degradation of Anthracene by Mycobacterium sp. Strain LB501T Proceeds via a Novel Pathway, through o-Phthalic Acid

2003 ◽  
Vol 69 (1) ◽  
pp. 186-190 ◽  
Author(s):  
René van Herwijnen ◽  
Dirk Springael ◽  
Pieter Slot ◽  
Harrie A. J. Govers ◽  
John R. Parsons
Keyword(s):  
Energy Source ◽  
Type Strain ◽  
Phthalic Acid ◽  
Protocatechuic Acid ◽  
Wild Type Strain ◽  
Degradation Pathway ◽  
Wild Type ◽  
Catabolic Pathway ◽  
Naphthalene Degradation

ABSTRACT Mycobacterium sp. strain LB501T utilizes anthracene as a sole carbon and energy source. We analyzed cultures of the wild-type strain and of UV-generated mutants impaired in anthracene utilization for metabolites to determine the anthracene degradation pathway. Identification of metabolites by comparison with authentic standards and transient accumulation of o-phthalic acid by the wild-type strain during growth on anthracene suggest a pathway through o-phthalic acid and protocatechuic acid. As the only productive degradation pathway known so far for anthracene proceeds through 2,3-dihydroxynaphthalene and the naphthalene degradation pathway to form salicylate, this indicates the existence of a novel anthracene catabolic pathway in Mycobacterium sp. LB501T.

scholarly journals Powerful Concentration of Rhodium in Plating Wastewater Using Homogeneous Liquid–Liquid Extraction (HoLLE) and Study for Scale-up

2017 ◽  
Vol 7 (4) ◽  
pp. 44 ◽  
Author(s):  
Takeshi Kato ◽  
Shotaro Saito ◽  
Shigekatsu Oshite ◽  
Shukuro Igarashi
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Aqueous Phase ◽  
Scale Up ◽  
Volume Ratio ◽  
Liquid Extraction ◽  
Optimum Conditions ◽  
Homogeneous Liquid ◽  
Liquid Liquid Extraction ◽  
Plating Wastewater

A powerful technique for the concentration of rhodium (Rh) in plating wastewater was developed. The technique entails complexing Rh with 1-(2-pyridylazo)-2-naphthol (PAN) followed by homogeneous liquid–liquid extraction (HoLLE) with Zonyl FSA. The optimum HoLLE conditions were determined as follows: [ethanol]T = 30.0 vol.%, pH = 4.00, and Rh:PAN = 1:5. Under these optimum conditions, 88.1% of Rh was extracted into the sedimented liquid phase. After phase separation, the volume ratio [aqueous phase (Va) /sedimented liquid phase (Vs)] of Va and Vs was 1000 (50 mL → 0.050 mL). We then applied the new method to wastewater generated by the plating industry. The phase separation was satisfactorily achieved when the volume was scaled up to 1000 mL of the actual wastewater; 84.7% of Rh was extracted into the sedimented liquid phase. After phase separation, Va/Vs was 588 (1000 mL - 1.70 mL).

Metabolism of a monoterpene alcohol, linalool, by a soil pseudomonad

1977 ◽  
Vol 23 (3) ◽  
pp. 230-239 ◽  
Author(s):  
K. M. Madyastha ◽  
P. K. Bhattacharyya ◽  
C. S. Vaidyanathan
Keyword(s):  
Mineral Salt Medium ◽  
Enrichment Culture ◽  
Sole Source ◽  
Mineral Salt ◽  
Salt Medium ◽  
Culture Techniques ◽  
Unsaturated Lactone ◽  
Linalool Oxide

A microorganism of the genus Pseudomonas has been isolated from the soil by enrichment culture techniques with linalool(I) as the sole source of carbon and energy. The organism is also capable of utilizing limonene, citronellol, and geraniol as substrates but fails to grow on citral, citranellal, and 1,8-cineole. Fermentation of linalool by this bacterium in a mineral salt medium results in the formation of 10-hydroxylinalool(II), 10-carboxylinalool(III), oleuropeic acid(IX), 2-vinyl-2-methyl-5-hydroxyisopropyl-tetrahydrofuran(linalool oxide, V), 2-vinyl-2-methyl-tetrahydrofuran-5-one(unsaturated lactone, VI), and few unidentified minor metabolites. Probable pathways for the biodegradation of linalool are presented.

Enhanced Biodegradation of Aniline under Anoxic Condition

2011 ◽  
Vol 356-360 ◽  
pp. 25-30 ◽  
Author(s):  
Jin You Shen ◽  
Chao Zhang ◽  
Xiu Yun Sun ◽  
Jian Sheng Li ◽  
Lian Jun Wang
Keyword(s):  
Performance Analysis ◽  
Benzene Ring ◽  
Organic Pollutants ◽  
Degradation Rate ◽  
Removal Rate ◽  
Degradation Process ◽  
Anoxic Condition ◽  
Aerobic Degradation ◽  
Industrial Wastewaters ◽  
Enhanced Biodegradation

Recalcitrant and toxic organic pollutants such as aniline from numerous industrial wastewaters can not be efficiently removed using the conventional methods. This study reported a concept for mineralization of aniline in an anoxic reactor, where enhanced biodegradation of aniline were achieved under anoxic conditions. The results indicated that with the presence of nitrate, the degradation rate of aniline was greatly improved compared with the absence of nitrate. From the UV-vis adsorption spectra, COD analysis and denitrification performance analysis, it could be inferred that the cleavage of benzene ring of aniline occurred, aniline could be mineralization by microorganisms under the anoxic condition. However, aniline removal rate was lower compared to aerobic degradation process, and thus needs a significant improvement.

Research on Coating Dispersion of Liquid Wear-Resistant Decorative Paper

2011 ◽  
Vol 413 ◽  
pp. 241-245
Author(s):  
Zhi Jun Hu ◽  
Xue Jin Zhang
Keyword(s):  
Influencing Factors ◽  
Aqueous Phase ◽  
Ph Value ◽  
Aqueous Suspension ◽  
Protective Layer ◽  
Surface Wear ◽  
Melamine Resin ◽  
Optimum Conditions ◽  
Wear Resistant ◽  
Good Consistency

Liquid wear-resistant technology combines original decorative paper and the surface wear-resistant paper into one. Wear-resistant particles are coated directly on the surface of base decorative paper, forming a transparent wear-resistant protective layer. The suspension behavior of ultra-fine A12O3 in the aqueous phase was investigated. The aim was further realizing the good consistency among A12O3, melamine resin and other components. The main influencing factors [viz., dispersant type, dispersant dosage, dispersive methods and pH value] were investigated to get the optimum conditions. The results showed that the stable aqueous suspension of ultrafine A12O3 could be obtained under the following conditions: the concentration of superfine A12O3 5wt%, pH = 9, anionic dispersant APAAA, the amount of dispersant 0.4wt%, ultrasonic suspension time 30min.

Synergetic Degradation of Enzyme-Fenton Reagent for Methyl Orange

2014 ◽  
Vol 1010-1012 ◽  
pp. 84-87
Author(s):  
Bin Yao ◽  
Zun Mian Xu ◽  
Cheng An Tao ◽  
Jian Fang Wang
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Ph Value ◽  
Uv Light ◽  
Degradation Efficiency ◽  
Optimum Conditions ◽  
Fenton Reagent ◽  
Effects Of Ph ◽  
Simulated Wastewater ◽  
Catalytic Effects

The effects of pH adjustment method, pH value, UV light, catalase and Fenton reagent on the degradation efficiency of enzyme-Fenton reagent for methyl orange (MO) were investigated, and the synergetic catalytic effects of catalase and Fenton reagent on the catalytic oxidation for methyl orange were found. When under no UV-light, the enzyme can enhance the degradation efficiency of Fenton reagent. The optimum conditions for degrading methyl orange simulated wastewater whose concentration is 0.1 g/L at room temperature are obtained as follows: the pH is tuned with H2SO4, pH is 3.0, concentration of catalase is 5 μg / mL, concentration of H2O2is 0.01%, concentration of FeSO4is 1.8μmol / L. The degradation rate can reach 98% in 60min. When under UV light at the same condition, the degradation rate can reach 94% in only 15min.

scholarly journals Statistical Optimization of Operational Parameters for Enhanced Naphthalene Degradation by Photocatalyst

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Aijuan Zhou ◽  
Jing Peng ◽  
Zhaobo Chen ◽  
Jingwen Du ◽  
Zechong Guo ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Design Method ◽  
Irradiation Time ◽  
Catalyst Loading ◽  
Statistical Experimental Design ◽  
Optimal Conditions ◽  
Operational Parameters ◽  
Excellent Correlation ◽  
Naphthalene Degradation ◽  
Central Composite

The optimization of operational parameters for enhanced naphthalene degradation by TiO2/Fe3O4-SiO2(TFS) photocatalyst was conducted using statistical experimental design and analysis. Central composite design method of response surface methodology (RSM) was adopted to investigate the optimum value of the selected factors for achieving maximum naphthalene degradation. Experimental results showed that irradiation time, pH, and TFS photocatalyst loading had significant influence on naphthalene degradation and the maximum degradation rate of 97.39% was predicted when the operational parameters were irradiation time 97.1 min, pH 2.1, and catalyst loading 0.962 g/L, respectively. The results were further verified by repeated experiments under optimal conditions. The excellent correlation between predicted and measured values further confirmed the validity and practicability of this statistical optimum strategy.

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