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Vullo AI, Vullo DL, Basack SB. Assessment of intensive periurban agriculture soil quality applying biomarkers in earthworms. J Environ Manage 2023; 344:118535. [PMID: 37399620 DOI: 10.1016/j.jenvman.2023.118535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 06/21/2023] [Accepted: 06/26/2023] [Indexed: 07/05/2023]
Abstract
Periurban agriculture in Argentina is carried out by farmers without adequate control. The indiscriminate agrochemical application for productivity improvement negatively impacts the environment. The objective of this work was to test the quality of periurban agricultural soils by performing bioassays with Eisenia andrei as an indicator. Soils belonging to two orchards with intensive production (S: strawberry/broccoli crop plot and G: tomato/pepper crop greenhouse - Moreno District, Buenos Aires, Argentina) were sampled during 2015 and 2016. As subcellular biomarkers, cholinesterases (ChE), carboxylesterases (CaE), and glutathione-S-transferases (GST) activities were analysed in E. andrei (7-day exposure). While no effect on ChE activities was observed, CaE activities were significantly reduced 18% (S-2016 soil). GST activities were increased 35% and 30% by S-2016 and G-2016, respectively. CaE decrease together with GST increase could be indicative of a negative disturbance. Concerning whole organism biomarkers, reproduction (56-day exposure), avoidance (3-day exposure), and feeding activity (bait-lamina test, 3-day exposure) were analysed. A reduced cocoons' viability (50%), hatchability (55%), accompanied by a low number of juveniles (50%) were observed in all cases. Additionally, the earthworms exhibited significant avoidance responses to S-2015, S-2016 and G-2016 whereas G-2015 soil induced migration. No significant effect on the feeding activity was registered in any case. Most of the E. andrei biomarkers tested could constitute an early warning of harmful effects produced by polluted periurban soils, even if the agrochemical treatment applied remains unknown. The results reveal the need to develop an action plan to avoid further deterioration of the productive soil.
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Affiliation(s)
- Ana I Vullo
- Área Química, Instituto de Ciencias, Universidad Nacional General Sarmiento, J.M. Gutiérrez 1150, 1613, Los Polvorines, Buenos Aires, Argentina.
| | - Diana L Vullo
- Área Química, Instituto de Ciencias, Universidad Nacional General Sarmiento, J.M. Gutiérrez 1150, 1613, Los Polvorines, Buenos Aires, Argentina; CONICET, Godoy Cruz, 2290, C1425FQB, Buenos Aires, Argentina.
| | - Silvana B Basack
- Área Química, Instituto de Ciencias, Universidad Nacional General Sarmiento, J.M. Gutiérrez 1150, 1613, Los Polvorines, Buenos Aires, Argentina.
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Busnelli MP, Lazzarini Behrmann IC, Ferreira ML, Candal RJ, Ramirez SA, Vullo DL. Metal- Pseudomonas veronii 2E Interactions as Strategies for Innovative Process Developments in Environmental Biotechnology. Front Microbiol 2021; 12:622600. [PMID: 33746918 PMCID: PMC7965972 DOI: 10.3389/fmicb.2021.622600] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 02/08/2021] [Indexed: 11/25/2022] Open
Abstract
The increase of industrial discharges is the first cause of the contamination of water bodies. The bacterial survival strategies contribute to the equilibrium restoration of ecosystems being useful tools for the development of innovative environmental biotechnologies. The aim of this work was to study the Cu(II) and Cd(II) biosensing, removal and recovery, mediated by whole cells, exopolymeric substances (EPS) and biosurfactants of the indigenous and non-pathogenic Pseudomonas veronii 2E to be applied in the development of wastewater biotreatments. An electrochemical biosensor was developed using P. veronii 2E biosorption mechanism mediated by the cell surface associated to bound exopolymeric substances. A Carbon Paste Electrode modified with P. veronii 2E (CPEM) was built using mineral oil, pre-washed graphite power and 24 h-dried cells. For Cd(II) quantification the CPEM was immersed in Cd(II) (1-25 μM), detected by Square Wave Voltammetry. A similar procedure was used for 1-50 μM Cu(II). Regarding Cd(II), removal mediated by immobilized EPS was tested in a 50 ml bioreactor with 0.13 mM Cd(II), pH 7.5. A 54% metal retention by EPS was achieved after 7 h of continuous operation, while a 40% was removed by a control resin. In addition, surfactants produced by P. veronii 2E were studied for recovery of Cd(II) adsorbed on diatomite, obtaining a 36% desorption efficiency at pH 6.5. Cu(II) adsorption from a 1 mM solution was tested using P. veronii 2E purified soluble EPS in 50 mL- batch reactors (pH = 5.5, 32°C). An 80% of the initial Cu(II) was retained using 1.04 g immobilized EPS. Focusing on metal recovery, Cu nanoparticles (NPs) biosynthesis by P. veronii 2E was carried out in Cu(II)-PYG Broth at 25°C for 5 days. Extracellular CuNPs were characterized by UV-Vis spectral analysis while both extracellular and intracellular NPs were analyzed by SEM and TEM techniques. Responses of P. veronii 2E and its products as biosurfactants, bound and soluble EPS allowed Cu(II) and Cd(II) removal, recovery and biosensing resulting in a multiple and versatile tool for sustainable wastewater biotreatments.
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Affiliation(s)
- María Pia Busnelli
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, Los Polvorines, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | | | - Maria Laura Ferreira
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, Los Polvorines, Argentina
| | - Roberto J. Candal
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
- Instituto de Investigación e Ingeniería Ambiental (IIIA), Universidad Nacional de General San Martin, San Martín, Argentina
| | - Silvana A. Ramirez
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, Los Polvorines, Argentina
| | - Diana L. Vullo
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, Los Polvorines, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
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Raiger Iustman LJ, Almasqué FJ, Vullo DL. Microbiota Diversity Change as Quality Indicator of Soils Exposed to Intensive Periurban Agriculture. Curr Microbiol 2020; 78:338-346. [PMID: 33249534 DOI: 10.1007/s00284-020-02298-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 11/13/2020] [Indexed: 11/30/2022]
Abstract
In Argentina, periurban agriculture is performed by farmers with inadequate training in the use of pesticides and chemical fertilizers, developing horticulture with serious soil deterioration. The aim of this work was to monitor bacterial diversity of a horticultural soil (S) and a reference soil (R) as quality index for the design of future restoration strategies. As crops changed together with the agrochemical applications, sample collection was before harvest for strawberries, post-harvest for red peppers, pre-harvest broccoli crop and of a resting soil in treatment with poultry litter as a fertilizing amendment. Bacterial diversity was analysed by the use of high throughput sequencing of the V1-V3 region of the 16S rRNA gene. Analysis of R soils seemed relatively constant in time, enriched in Alphaproteobacteria and Acidobacteria consistent with a reference to soil health. The effect of the intensive use of S soils was proved by differences in Chloroflexi, Bacteroidetes and Proteobacteria relative abundances. The main evidence of the alteration of S soils was the increase in Bacteroidetes and Betaproteobacteria. A weak recuperation trend of S soil microbiota was registered during a post-harvest inactive period. A strong influence of the soil use routine-consisting in high crop rotation and short time-rest cycles-on microbial community structure was verified. These results indicate the microbiota perturbation, caused by the intense use of periurban agriculture soils and will contribute for further actions to improve environment quality.
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Affiliation(s)
- Laura J Raiger Iustman
- Depto. de Química Biológica, Facultad de Ciencias Exactas y Naturales (UBA), IQUIBICEN-CONICET. Pab. II, Piso 4, Ciudad Universitaria, (1428), Buenos Aires, Argentina
| | - Facundo J Almasqué
- Depto. de Química Biológica, Facultad de Ciencias Exactas y Naturales (UBA), IQUIBICEN-CONICET. Pab. II, Piso 4, Ciudad Universitaria, (1428), Buenos Aires, Argentina
| | - Diana L Vullo
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento-CONICET, J.M. Gutierrez 1150, B1613GSX, Los Polvorines, Buenos Aires, Argentina.
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Cavallero GJ, Ferreira ML, Casabuono AC, Ramírez SA, Vullo DL, Couto AS. Structural characterization and metal biosorptive activity of the major polysaccharide produced by Pseudomonas veronii 2E. Carbohydr Polym 2020; 245:116458. [DOI: 10.1016/j.carbpol.2020.116458] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 04/17/2020] [Accepted: 05/14/2020] [Indexed: 01/01/2023]
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Lazzarini Behrmann IC, Grattieri M, Minteer SD, Ramirez SA, Vullo DL. Online self-powered Cr(VI) monitoring with autochthonous Pseudomonas and a bio-inspired redox polymer. Anal Bioanal Chem 2020; 412:6449-6457. [DOI: 10.1007/s00216-020-02620-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 03/24/2020] [Accepted: 03/26/2020] [Indexed: 12/11/2022]
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Ferreira ML, Gerbino E, Cavallero GJ, Casabuono AC, Couto AS, Gomez-Zavaglia A, Ramirez SAM, Vullo DL. Infrared spectroscopy with multivariate analysis to interrogate the interaction of whole cells and secreted soluble exopolimeric substances of Pseudomonas veronii 2E with Cd(II), Cu(II) and Zn(II). Spectrochim Acta A Mol Biomol Spectrosc 2020; 228:117820. [PMID: 31771908 DOI: 10.1016/j.saa.2019.117820] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 10/23/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
Extracellular polymeric substances (EPS) are bacterial products associated to cell wall or secreted to the liquid media that form the framework of microbial mats. These EPS contain functional groups as carboxyl, amino, hydroxyl, phosphate and sulfhydryl, able to interact with cations. Thus, EPS may be considered natural detoxifying compounds of metal polluted waters and wastewaters. In this work Attenuated Total Reflectance-Fourier Transform Infrared spectroscopy (ATR-FTIR) in combination with multivariate analysis (Principal Component Analysis-PCA-) were used to study the interaction of Cd(II), Cu(II) and Zn(II) and Pseudomonas veronii 2E cells, including bound EPS and cell wall, and its different soluble EPS fractions, previously characterized as Cd(II) ligands of moderate strength. Amino groups present in exopolysaccharide fraction were responsible for Zn(II) and Cu(II) complexation, while carboxylates chelated Cd(II). In lipopolysaccharide fraction, phosphoryl and carboxyl sites were involved in Cd(II) and Cu(II) binding, while Zn(II) interacted with amino groups. Similar results were obtained from cells. These studies confirmed that FTIR-PCA is a rapid analytical tool to provide valuable information regarding the functional groups in biomolecules related to metal interaction. Moreover, a discrimination and identification of functional groups present in both EPS and cells that interacted with Cd(II), Zn(II) and Cu(II) was demonstrated.
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Affiliation(s)
- Maria L Ferreira
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutierrez 1150, B1613GSX, Los Polvorines, Buenos Aires, Argentina; CONICET, Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina.
| | - Esteban Gerbino
- CONICET, Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina; Centro de Investigación y Desarrollo en Criotecnología de Alimentos CIDCA (CCT-CONICET, La Plata), RA 1900 La Plata, Argentina.
| | - Gustavo J Cavallero
- CONICET, Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina; Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica - Consejo Nacional de Investigaciones Científicas y Técnicas, Centro de Investigación en Hidratos de Carbono (CIHIDECAR), Pab. II, Ciudad Universitaria, 1428, Buenos Aires, Argentina.
| | - Adriana C Casabuono
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica - Consejo Nacional de Investigaciones Científicas y Técnicas, Centro de Investigación en Hidratos de Carbono (CIHIDECAR), Pab. II, Ciudad Universitaria, 1428, Buenos Aires, Argentina.
| | - Alicia S Couto
- CONICET, Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina; Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica - Consejo Nacional de Investigaciones Científicas y Técnicas, Centro de Investigación en Hidratos de Carbono (CIHIDECAR), Pab. II, Ciudad Universitaria, 1428, Buenos Aires, Argentina.
| | - Andrea Gomez-Zavaglia
- CONICET, Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina; Centro de Investigación y Desarrollo en Criotecnología de Alimentos CIDCA (CCT-CONICET, La Plata), RA 1900 La Plata, Argentina.
| | - Silvana A M Ramirez
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutierrez 1150, B1613GSX, Los Polvorines, Buenos Aires, Argentina.
| | - Diana L Vullo
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutierrez 1150, B1613GSX, Los Polvorines, Buenos Aires, Argentina; CONICET, Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina.
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Piol MN, Saralegui A, Orero G, Boeykens S, Basack S, Vullo DL. Improvement of laboratory skills of Chemical and Civil Engineering students using an interdisciplinary service-learning project for water quality and supply assessment in low-income homes. FEMS Microbiol Lett 2019; 366:5526220. [DOI: 10.1093/femsle/fnz143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 06/25/2019] [Indexed: 11/13/2022] Open
Abstract
ABSTRACT
The University of Buenos Aires (UBA) develops the UBANEX program, focused on service-learning projects for students involving social, environmental and public health concerns. One of the proposals was a collaborative project between UBA and the National University of General Sarmiento. Based on the hypothesis that students’ voluntary involvement in social concerns improves their attitudes towards themselves and learning, the aim was to focus on the development of social and professional skills by implementing an interdisciplinary work for water quality and supply assessment in low-income homes from a southern district of the Buenos Aires Metropolitan Area. Eighteen volunteers—Chemical and Civil Engineering students—were recruited during August–December 2016. Tasks were distributed according to their interests: survey making, sampling, lab analysis, infrastructure checking, etc. Volunteers were surveyed in social involvement, lab skills, data compilation and analysis, leading to a final report with recommendations for a proper water use. The survey results compiled their feedback: 72% admitted an update on water quality problems, 60% learned new lab techniques and were able to analyze results, 89% supported the University’s involvement in social concerns and 56% expanded their opinion about the professional field. The students confirmed their interest in participating in the next UBANEX project.
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Affiliation(s)
- María Natalia Piol
- Universidad de Buenos Aires, Facultad de Ingeniería, Laboratorio de Química de Sistemas Heterogéneos. Av. Paseo Colón 850, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290, Buenos Aires, Argentina
| | - Andrea Saralegui
- Universidad de Buenos Aires, Facultad de Ingeniería, Laboratorio de Química de Sistemas Heterogéneos. Av. Paseo Colón 850, Buenos Aires, Argentina
| | - Gabriela Orero
- Universidad de Buenos Aires, Facultad de Arquitectura, Cátedra de Patologías de la Construcción, Mantenimiento y Rehabilitación de Hábitat, Pabellón III, Ciudad Universitaria, Buenos Aires, Argentina
| | - Susana Boeykens
- Universidad de Buenos Aires, Facultad de Ingeniería, Laboratorio de Química de Sistemas Heterogéneos. Av. Paseo Colón 850, Buenos Aires, Argentina
| | - Silvana Basack
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutiérrez 1150, Los Polvorines, Buenos Aires, Argentina
| | - Diana L Vullo
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290, Buenos Aires, Argentina
- Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutiérrez 1150, Los Polvorines, Buenos Aires, Argentina
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Garavaglia L, Cerdeira SB, Vullo DL. Chromium (VI) biotransformation by beta- and gamma-Proteobacteria from natural polluted environments: a combined biological and chemical treatment for industrial wastes. J Hazard Mater 2010; 175:104-110. [PMID: 19879691 DOI: 10.1016/j.jhazmat.2009.09.134] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2009] [Revised: 09/24/2009] [Accepted: 09/25/2009] [Indexed: 05/28/2023]
Abstract
The high solubility of Cr(VI) in aqueous systems, together with carcinogenic and mutagenic effects on living organisms, make industrial effluents receive specific treatments for Cr(VI) elimination. Biotreatments, based on biotransformation of Cr(VI) to Cr(III) which is immobilized as Cr(OH)(3), are the most effective methods for the removal of Cr(VI) concentrations below 2mM. The aim of our study is the application of pure or mixed bacterial cultures for Cr(VI) biotransformation followed by chemical flocculation of Cr(OH)(3) as a combined treatment for industrial wastes. Pseudomonas veronii 2E, Delftia acidovorans AR, Klebsiella oxytoca P2 and Klebsiella ornithinolytica 1P, isolated from polluted environments showed a decrease from 38.83 to 74.32%, in 0.05 mM of initial Cr(VI). As revealed DGGE experiments, P. veronii 2E and K. ornithinolytica 1P could develop together in cocultures and in these conditions a 72.88% of Cr(VI) present was removed. Although the pH of the cultures was 8, no Cr(OH)(3) sediment was detected. The results of total chromium quantification support this observation. The precipitation of Cr(III) was induced using different commercial flocculants. Best yields were obtained using Na(2)CO(3) 0.1M, which allowed the flocculation of almost 100% of Cr(III) present. This combined treatment would be an economical and ecological way to remove Cr(VI).
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Affiliation(s)
- Luciana Garavaglia
- Area Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutiérrez 1150, B1613GSX, Los Polvorines, Buenos Aires, Argentina.
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Vullo DL, Ceretti HM, Daniel MA, Ramírez SAM, Zalts A. Cadmium, zinc and copper biosorption mediated by Pseudomonas veronii 2E. Bioresour Technol 2008; 99:5574-5581. [PMID: 18158237 DOI: 10.1016/j.biortech.2007.10.060] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2007] [Revised: 10/25/2007] [Accepted: 10/25/2007] [Indexed: 05/25/2023]
Abstract
Adsorption properties of bacterial biomass were tested for Cd removal from liquid effluents. Experimental conditions (pH, time, cellular mass, volume, metal concentration) were studied to develop an efficient biosorption process with free or immobilised cells of Pseudomonas veronii 2E. Surface fixation was chosen to immobilise cells on inert surfaces including teflon membranes, silicone rubber and polyurethane foam. Biosorption experiments were carried out at 32 degrees C and controlled pH; maximal Cd(II) retention was observed at pH 7.5. The isotherm followed the Langmuir model (K(d)=0.17 mM and q(max)=0.48 mmol/g cell dry weight). Small changes in the surface negative charge of cells were observed by electrophoretic mobility experiments in presence of Cd(II). In addition, biosorption of 40% Cu(II) (pH 5 and 6.2) and 50% Zn(II) and 50% Cd(II) (pH 7.5) was observed from mixtures of Cu(II), Zn(II) and Cd(II) 0.5mM each.
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Affiliation(s)
- Diana L Vullo
- Area Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutiérrez 1150, (B1613GSX) Los Polvorines, Buenos Aires, Argentina.
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Vullo DL, Ceretti HM, Hughes EA, Ramírez S, Zalts A. Indigenous heavy metal multiresistant microbiota of Las Catonas stream. Environ Monit Assess 2005; 105:81-97. [PMID: 15952513 DOI: 10.1007/s10661-005-3157-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Las Catonas stream (Buenos Aires Metropolitan Area) receives a complex mixture of pollutants from point and diffuse sources because of the agricultural, industrial and urban land uses of its basin. Widespread detection of heavy metals exceeding aquatic life protection levels has occurred in monitoring reconnaissance studies in surface and pore water. As a result of the screening of Cu, Cd, Zn and Pb resistant/tolerant and culturable microbiota, B101N and 200H strains (Pseudomonas fluorescens or putida) were isolated and selected for further studies. They showed 65% Cd and 35% Zn extraction efficiency from aqueous phase. The potential use of these strains in wastewater treatment is currently investigated in order to contribute to decrease heavy metal pollution, a problem affecting every stream of Buenos Aires Metropolitan Area.
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Affiliation(s)
- Diana L Vullo
- Area Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutierrez 1150, Los Polvorines, Provincia de Buenos Aires, Argentina.
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Vullo DL, Coto CE, Siñeriz F. Characteristics of an inulinase produced by Bacillus subtilis 430A, a strain isolated from the rhizosphere of Vernonia herbacea (Vell Rusby). Appl Environ Microbiol 1991; 57:2392-4. [PMID: 1768108 PMCID: PMC183581 DOI: 10.1128/aem.57.8.2392-2394.1991] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Bacillus subtilis 430A, isolated from the Vernonia herbacea (Vell Rusby) rhizosphere, produced an exocellular inulinase that fits the requirements for the production of syrups on an industrial scale. The partially purified enzyme, obtained by acetone precipitation, displayed a higher specificity for inulin (Km, 8 mM) than for sucrose (56 mM) and a total invertase/total inulase ratio of 0.62. In addition, it is stable at an optimal temperature of 45 to 50 degrees C for at least 7 h and is inhibited by the end product, fructose, at 14 mM.
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Affiliation(s)
- D L Vullo
- Departamento de Quimica Biológica, Facultad de Ciencias Exactas y Naturales (UBA), Ciudad Universitaria, Buenos Aires, Argentina
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