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Nercessian O, Parot S, Délia ML, Bergel A, Achouak W. Harvesting electricity with Geobacter bremensis isolated from compost. PLoS One 2012; 7:e34216. [PMID: 22470538 PMCID: PMC3314594 DOI: 10.1371/journal.pone.0034216] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 02/25/2012] [Indexed: 11/18/2022] Open
Abstract
Electrochemically active (EA) biofilms were formed on metallic dimensionally stable anode-type electrode (DSA), embedded in garden compost and polarized at +0.50 V/SCE. Analysis of 16S rRNA gene libraries revealed that biofilms were heavily enriched in Deltaproteobacteria in comparison to control biofilms formed on non-polarized electrodes, which were preferentially composed of Gammaproteobacteria and Firmicutes. Among Deltaproteobacteria, sequences affiliated with Pelobacter and Geobacter genera were identified. A bacterial consortium was cultivated, in which 25 isolates were identified as Geobacter bremensis. Pure cultures of 4 different G. bremensis isolates gave higher current densities (1400 mA/m2 on DSA, 2490 mA/m2 on graphite) than the original multi-species biofilms (in average 300 mA/m2 on DSA) and the G. bremensis DSM type strain (100–300 A/m2 on DSA; 2485 mA/m2 on graphite). FISH analysis confirmed that G. bremensis represented a minor fraction in the original EA biofilm, in which species related to Pelobacter genus were predominant. The Pelobacter type strain did not show EA capacity, which can explain the lower performance of the multi-species biofilms. These results stressed the great interest of extracting and culturing pure EA strains from wild EA biofilms to improve the current density provided by microbial anodes.
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Affiliation(s)
- Olivier Nercessian
- CEA, DSV, IBEB, SBVME, Lab Ecol Microb Rhizosphere and Environ Extrem (LEMiRE), Saint-Paul-lez-Durance, France
- CNRS UMR 7265 and FR CNRS 3098 ECCOREV, Saint-Paul-lez-Durance, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, France
| | - Sandrine Parot
- Laboratoire de Génie Chimique, Centre National de la Recherche Scientifique, Université de Toulouse (INPT), Toulouse, France
| | - Marie-Line Délia
- Laboratoire de Génie Chimique, Centre National de la Recherche Scientifique, Université de Toulouse (INPT), Toulouse, France
| | - Alain Bergel
- Laboratoire de Génie Chimique, Centre National de la Recherche Scientifique, Université de Toulouse (INPT), Toulouse, France
| | - Wafa Achouak
- CEA, DSV, IBEB, SBVME, Lab Ecol Microb Rhizosphere and Environ Extrem (LEMiRE), Saint-Paul-lez-Durance, France
- CNRS UMR 7265 and FR CNRS 3098 ECCOREV, Saint-Paul-lez-Durance, France
- Aix-Marseille Université, Saint-Paul-lez-Durance, France
- * E-mail:
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Parot S, Vandecandelaere I, Cournet A, Délia ML, Vandamme P, Bergé M, Roques C, Bergel A. Catalysis of the electrochemical reduction of oxygen by bacteria isolated from electro-active biofilms formed in seawater. Bioresour Technol 2011; 102:304-311. [PMID: 20673715 DOI: 10.1016/j.biortech.2010.06.157] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Revised: 06/18/2010] [Accepted: 06/25/2010] [Indexed: 05/29/2023]
Abstract
Biofilms formed in aerobic seawater on stainless steel are known to be efficient catalysts of the electrochemical reduction of oxygen. Based on their genomic analysis, seven bacterial isolates were selected and a cyclic voltammetry (CV) procedure was implemented to check their electrocatalytic activity towards oxygen reduction. All isolates exhibited close catalytic characteristics. Comparison between CVs recorded with glassy carbon and pyrolytic graphite electrodes showed that the catalytic effect was not correlated with the surface area covered by the cells. The low catalytic effect obtained with filtered isolates indicated the involvement of released redox compounds, which was confirmed by CVs performed with adsorbed iron-porphyrin. None of the isolates were able to form electro-active biofilms under constant polarization. The capacity to catalyze oxygen reduction is shown to be a widespread property among bacteria, but the property detected by CV does not necessarily confer the ability to achieve stable oxygen reduction under constant polarization.
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Affiliation(s)
- Sandrine Parot
- Laboratoire de Génie Chimique CNRS-INPT, 4 allée Emile Monso BP 84234, 31030 Toulouse, France
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Poitrenaud J, Parot S. Effets de I’âge sur les processus d’apprentissage et de rétention. Gerontology 2009. [DOI: 10.1159/000211821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Parot S, Bourlière F. Une nouvelle technique de mesure de la compressibilité de la peau et du tissu sous-cutané. Influence du sexe, de l’âge et du site de mesure sur les résultats. Gerontology 2009. [DOI: 10.1159/000211587] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Poitrenaud J, Parot S. Analyse de certaines corréations et de leur évolution au cours du vieillissemenl chez I’homme. Gerontology 2009. [DOI: 10.1159/000211706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Parot S, Nercessian O, Delia ML, Achouak W, Bergel A. Electrochemical checking of aerobic isolates from electrochemically active biofilms formed in compost. J Appl Microbiol 2009; 106:1350-9. [PMID: 19228259 DOI: 10.1111/j.1365-2672.2008.04103.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To design a cyclic voltammetry (CV) procedure to check the electrochemical activity of bacterial isolates that may explain the electrochemical properties of biofilms formed in compost. METHODS AND RESULTS Bacteria catalysing acetate oxidation in garden compost were able to form electrochemically active biofilms by transferring electrons to an electrode under chronoamperometry. They were recovered from the electrode surface and identification of the isolates using 16S rRNA sequencing showed that most of them were Gammaproteobacteria, mainly related to Enterobacter and Pseudomonas spp. A CV procedure was designed to check the electrochemical activity of both groups of isolates. Preliminary CVs suggested that the bacteria were not responsible for the catalysis of acetate oxidation. In contrast, both groups of isolates were found to catalyse the electrochemical reduction of oxygen under experimental conditions that favoured adsorption of the microbial cells on the electrode surface. CONCLUSIONS Members of the genera Enterobacter and Pseudomonas were found to be able to catalyse the electrochemical reduction of oxygen. SIGNIFICANCE AND IMPACT OF THE STUDY This study has shown the unexpected efficiency of Enterobacter and Pseudomonas spp. in catalysing the reduction of oxygen, suggesting a possible involvement of these species in biocorrosion, or possible application of these strains in designing bio-cathode for microbial fuel cells.
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Affiliation(s)
- S Parot
- CNRS-University of Toulouse, France
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Parot S, Délia ML, Bergel A. Forming electrochemically active biofilms from garden compost under chronoamperometry. Bioresour Technol 2008; 99:4809-4816. [PMID: 17988862 DOI: 10.1016/j.biortech.2007.09.047] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2007] [Revised: 09/18/2007] [Accepted: 09/18/2007] [Indexed: 05/25/2023]
Abstract
Dimensionally stable anodes (DSA) were polarized at different constant potential values for several days in garden compost. After an initial lag period ranging from 1 to 10.5 days, the current increased fast and then stabilized for days. Current densities higher than 100 mA m(-2) and up to 385 mA m(-2) were obtained with the sole organic matter contained in compost as substrate. Control experiments performed with sterilized compost, oscillations of the current with the temperature, kinetics of the exponential phase of current increase and observations of the surface of electrodes by epifluorescence microscopy showed that the current was controlled by the colonization of the electrode surface by a biofilm which originated the indigenous flora of compost. Three individually addressed electrodes polarized at different potentials in the same reactor led to identical current evolutions on each electrode, which underlined the key role of the microbial flora of the compost in the discrepancy observed in the other experiments. Chronoamperometry revealed a promising technique to check natural environments for new electrochemically active microbial species.
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Affiliation(s)
- Sandrine Parot
- Laboratoire de Génie Chimique-CNRS-INPT, 5 Rue Paulin Talabot, 31106 Toulouse, France
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Parot S, Bonora M, Gautier H, Marlot D. Developmental changes in ventilation and breathing pattern in unanesthetized kittens. Respir Physiol 1984; 58:253-62. [PMID: 6528103 DOI: 10.1016/0034-5687(84)90002-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Ventilation and the breathing pattern of 12 intact, unanesthetized, unrestrained kittens, were recorded at intervals from the second postnatal day to the end of the eighth month. Five of the animals were also studied at 12 months of age. Ventilation (VE) became stable by the 5th month, whereas body weight was still increasing. The relationship between tidal volume (VT) and breathing rate (BR) changed with age. During the 1st month, BR fell and VT increased, VE increasing slowly. From 1 to 5 months, BR remained nearly constant while VT increased. Finally, from 5 to 12 months, BR decreased slightly, VT increased slightly, and VE did not change. The results are compared with relevant data from the literature, especially those derived from interspecific analyses.
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Parot S, Miara B, Milic-Emili J, Gautier H. Hypoxemia, hypercapnia, and breathing pattern in patients with chronic obstructive pulmonary disease. Am Rev Respir Dis 1982; 126:882-6. [PMID: 7149454 DOI: 10.1164/arrd.1982.126.5.882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The results of lung function tests (total and functional residual capacities, residual volume/total lung capacity ratio, forced expiratory volume in one second) breathing patterns and arterial PO2 and PCO2 were studied in 651 ambulatory male patients with chronic obstructive pulmonary disease, functionally and clinically stable. Function tests were only loosely correlated with gas tensions: abnormalities in mechanics and in gas exchange are not necessarily related. In patients matched for the degree of obstruction, the breathing pattern depended upon both PaO2 and PaCO2. Isolated hypoxemia was accompanied by increased respiratory frequency without any variation in tidal volume: this suggests that the chemoreceptive systems still responded to changes in PaO2. Isolated hypercapnia was accompanied by a decrease in tidal volume and an increase in respiratory frequency. Consequently, the dead space/tidal volume ratio increased, leading to a drop in alveolar ventilation and to CO2 retention.
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Parot S, Saunier C, Schrijen F, Gautier H, Milic-Emili J. Concomitant changes in function tests, breathing pattern And PaCO2 in patients with chronic obstructive pulmonary disease. Bull Eur Physiopathol Respir 1982; 18:145-51. [PMID: 6797493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
151 ambulatory male patients with chronic obstructive pulmonary disease have been studied twice, at time intervals ranging from 2 to 36 months (average : 11), to determine the relationships between changes in lung function tests, pattern of breathing and arterial PCO2. This longitudinal analysis confirms the results of cross-sectional studies: variations in PaCO2 seem independent of the evolution of lung function tests (FEV1, VC, FEV1/VC, RV/TLC). Increases in PaCO2 are associated with a decrease in tidal volume and no change in respiratory frequency. These changes in breathing pattern result in a decreased minute ventilation and an increased VD/VT ratio.
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Abstract
Analysis of raw data from 822 (224 women and 598 men) Caucasian healthy subjects with age ranging from 19 to 50 years leads to a multiple correlation coefficient equal to 0.75 between vital capacity and age, height and weight. In spite of this highly significant correlation coefficient, the predicting value of the regression equation is very poor: on the one hand, residual fluctuation is very important, on the other hand, because of the small intraindividual variability, "normal for the group' does not necessarily mean "normal for the individual'.
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Parot S, Saunier C, Gautier H, Milic-Emili J, Sadoul P. Breathing pattern and hypercapnia in patients with obstructive pulmonary disease. Am Rev Respir Dis 1980; 121:985-91. [PMID: 7416598 DOI: 10.1164/arrd.1980.121.6.985] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Benoit O, Garma L, Parot S, Leygoinie F, Belugou JL, Olivier L. Study of rapid eye movements over several nights' recording in the same subject. Electroencephalogr Clin Neurophysiol 1971; 30:250. [PMID: 4103157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Thomas J, Houzel D, Parot S, Benoit O, Lille F, Kujas M, Chataignier C. The change in frequency of rapid eye movements in normal human sleep. Electroencephalogr Clin Neurophysiol 1971; 30:253. [PMID: 4103168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Parot S. [Choice of a morphological reference to evaluate energy consumption]. Biol Med (Paris) 1971; 60:56-79. [PMID: 4251907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Benoit O, Garma L, Parot S, Leygonie F, Belugou JL, Olivier L. [Ocular movement phase during several nights of recording with the same patient]. Rev Neurol (Paris) 1970; 122:524-6. [PMID: 4325149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Thomas J, Houzel D, Parot S, Benoit O, Lille F, Kujas M, Chataignier C. [Development of ocular movement frequency during ocular movement phase in normal humans]. Rev Neurol (Paris) 1970; 122:523-4. [PMID: 4325148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Parot S, Chaudun E, Jacquemin E. The origin of postural variations of human lung volumes as explained by the effects of age. Respiration 1970; 27:254-60. [PMID: 5421222 DOI: 10.1159/000192686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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Parot S, Jacquemin E, Poitrenaud J. [Vital capacity of old and very old patients: problems raised by the establishment of normal values]. J Physiol (Paris) 1969; 61:265-76. [PMID: 5376816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Poitrenaud J, Parot S. [The role of pain in the psychology of ulcers]. Encephale 1967; 56:510-29. [PMID: 4387132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Ryckewaert A, Parot S, Tamisier S, Bourlière F. [Variations, according to sex and age, of the thickness of the skin fold measured on the back of the hand]. Rev Fr Etud Clin Biol 1967; 12:803-6. [PMID: 6076489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Parot S, Bourlière F. [A new technique for the measurement of the compressibility of the skin and subcutaneous tissue. Role of sex, age and site of measurement]. Gerontologia 1967; 13:95-110. [PMID: 6031603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Ryckewaert A, Dry J, Paolaggi F, Parot S, de Sèze S. [Blood uric acid levels in some osteo-articular diseases not including gout]. Rein Foie 1966; 8:115-120. [PMID: 5914031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Bourlière F, Clément F, Parot S. « Normes » de vieillissement morphologique et physiologique d'une population de niveau socio-économique élevé de la région parisienne. ACTA ACUST UNITED AC 1966. [DOI: 10.3406/bmsap.1966.1498] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Parot S. [Some physiologic aspects of human aging]. Prog Med (Paris) 1965; 93:643-5. [PMID: 5857686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Bargeton D, Barres G, De Lattre J, Parot S. [Effects of minor periodic changes in the partial oxygen pressure in the inspired air on resting ventilation]. J Physiol (Paris) 1965; 57:549. [PMID: 5847045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Parot S. [Is urinary creatinine able to serve as an estimation of the active muscular mass?]. Rev Fr Etud Clin Biol 1965; 10:724-8. [PMID: 5848985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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