Redox Electricity from Microbes to power LEDs

Research Project - Microbe Fuel Cells, language: Biogeochemical cycling through microbial succession in Winogradsky columns generates electricity. Here we use all electricals tools possible to harness this electricity and power Light Emitting Diodes for a year or more. The setup, biochemical mechanisms are analysed. Read more Read less. Here's how restrictions apply.

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Get to Know Us. English Choose a language for shopping. The matrix developed in this study was also used to create 10 bryoMFCs operated with an environmental sample containing a mix of six different moss species. The power density with the environmental samples was significantly greater than with P. This could be owing to any of a number of factors, including the moss or microorganism species present, or the amount of organic matter associated with the environmental samples on collection. We have shown that: Carbon fibre anodes have been used previously as a three-dimensional flexible network [ 38 ] or as a planar sheet of carbon cloth [ 40 ].

Five test samples of this matrix were generated, with the weight-to-weight ratio p: These were tested against a control sample made of paper only p: C ratio of 1: The matrix was created on the assumption that the thickness several millimetres would provide more surface area for improving the contact between moss and anode, and consequently improve electrical output. The matrix variants and the control are shown in the electronic supplementary material, figure S2.

To serve as an anodic substrate for a bryoMFC, the matrix variants and the control sample were evaluated as a suitable anodic growth substrate for a bryoMFC, and desirable characteristics such as: The medium does not provide a major source of fixed carbon. Equal amounts of blended filaments of P. Biomass accumulated after 20 days' growth was determined by taking the desiccated moss away from the surface of the matrix variant with metal tweezers and determining its mass using a precision balance Adam Equipment Co.

Specimens were left in a dry and dark cabinet at room temperature for about a month for desiccation. Leaf temperature was calculated within the Li-Cor using energy balance techniques and set to be maintained at Photosynthetic parameters were measured at varying photon flux densities waveband: The chlorophyll content of each moss sample was quantified as described in Porra et al. Water retention in the control sample p: This was measured across the control sample p: For each device, an anode was made from the matrix variant as described below.

For the anode, the chosen ratio p: The container was dried and then autoclaved. For devices under near-sterile conditions, watering was carried out using a silicone tube with a filter added following autoclave sterilization. For the control experiments, the same amount of BCD medium without moss filaments was added. A culture of filamentous P. Cultures were passaged weekly and the concentration was monitored by spectrophotometric determination of chlorophyll extracted in The inoculum of moss culture approx.

Unless stated otherwise, experiments were conducted with the lid closed. To normalize the performances of the devices to differences in culture growth rate, mosses were grown for 8 days before the start of recording. Polarization curves were performed every 7 days of operation. The negative controls moss-free were run under the same conditions used for the bryoMFCs operated with moss except that the negative controls were wrapped with aluminium foil to prevent the proliferation of autotrophic organisms e. Polarization curves were generated for every bryoMFC operated with P. Current was calculated from Ohm's Law as in the following equation:.

Based on the polarization curves, power curves were drawn for each system by plotting power per unit APGA or power density as a function of current density. Power P was calculated as shown in the following equation:. The power density curves were further used to determine the average maximum power output for the bryoMFC and the negative control. One-way analysis of variance ANOVA was used to determine whether there were any significant differences between the means of independent unrelated groups of data.

When the p -value is greater than 0. The complete results obtained from the ANOVA tests run in this study are shown in the electronic supplementary material, table s S1. The results were calculated using online software [ 43 ]. The matrix developed in this study was also used as an anodic matrix for testing the electrogenic activity of environmental samples of moss.

A mix of six species Amblystegium serpens , Brachythecium rutabulum , Bryum capillare , Bryum dichotomum , Ceratodon purpureus and Syntrichia ruralis was obtained from the roof of the bicycle shed in the Department of Biochemistry, Downing Site, Cambridge, UK electronic supplementary material, figure S5. The apparatus was designed and constructed by Fabienne Felder. For each device, an anode was made from the matrix electronic supplementary material, figure S2 as described above. The environmental samples of moss were kept in the 10 systems for few weeks before characterization of current and power output.

To power the radio, 10 pots were connected in series and used to charge a rechargeable battery with a nominal voltage of 3. After that, it was confirmed that the discharged battery was unable to power the radio by connecting the battery to it. The authors are grateful to Dr Chris D. Preston for the identification of the moss species in the environmental samples.

No special collecting permit was required at that time to obtain environmental sample of mosses from a private premises i. University of Cambridge, Downing Site. Howe conceived and designed the study. Harrison supervised the research. All authors discussed the results and contributed to the data interpretation. Howe , EnAlgae http: Harrison , the Leverhulme Trust P.

Howe , the Shuttleworth Foundation P. National Center for Biotechnology Information , U. R Soc Open Sci. Published online Oct Harrison , 3 Alison G. Smith , 2 C. Jill Harrison , 4 and Christopher J. Author information Article notes Copyright and License information Disclaimer.

Electronic supplementary material is available online at https: Received Apr 10; Accepted Sep This article has been cited by other articles in PMC.

Established shoots several months old of P. Six test samples of the anodic matrix variant. BryoMFC systems with P. Cartoon describing Moss FM. The planar sheet of carbon fibre. Abstract Plant microbial fuel cells are a recently developed technology that exploits photosynthesis in vascular plants by harnessing solar energy and generating electrical power.

Introduction Population and economic growth drive global energy demand. Open in a separate window. Anodic matrix A novel matrix was created and used in the bryoMFCs as an anodic electron conductive substrate. Trends in electric output of bryophyte microbial fuel cells The bryoMFCs using the novel anodic matrix described above were sterilized by autoclaving and then inoculated with a protonemal P.

Power density of bryophyte microbial fuel cells Power output was determined for the bryoMFCs over periods of 70 days with established P. Discussion This study successfully created and characterized a novel three-dimensional anodic matrix, and tested the suitability of mosses to generate electrical output in a MFC using the novel anodic matrix. Material and methods 4. Water retention Water retention in the control sample p: Electrical resistance This was measured across the control sample p: Experimental set-up A culture of filamentous P.

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Current was calculated from Ohm's Law as in the following equation: Statistical analysis One-way analysis of variance ANOVA was used to determine whether there were any significant differences between the means of independent unrelated groups of data. Construction of the moss pots used to form the Moss FM The matrix developed in this study was also used as an anodic matrix for testing the electrogenic activity of environmental samples of moss.

Click here to view. Supplementary Material Supplementary Table 1. Supplementary Material Supplementary Table 2. Supplementary Material Supplementary Table 3. Supplementary Material Supplementary Table 4. Supplementary Material Supplementary Table 5. Supplementary Material Supplementary Table 6.

Supplementary Material Supplementary Table 7.

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Supplementary Material Supplementary Table 8. Supplementary Material Supplementary Table 9. Supplementary Material Supplementary Table Supplementary Material Bombelli data. Acknowledgements The authors are grateful to Dr Chris D. Ethics No special collecting permit was required at that time to obtain environmental sample of mosses from a private premises i.

Competing interests The authors declare no competing financial interests.

Electricity Generated from MudWatt Microbial Fuel Cell - Blink LED - Electricity from Microbes

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