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An international research group has a new understanding of cable bacteria

an international research group has a new understanding of cable bacteria

11:23:51 source:

an international research group has a new understanding of cable bacteria. Using lasers, researchers tracked electrons as they passed through conductive bacteria, and based on the potential in the bacteria, they calculated that the bacteria due to voltage loss could not function effectively at a depth of more than 3 cm. Sedimentation

researchers from Aarhus University, together with colleagues from the Netherlands and Austria, used a laser spectrometer as an advanced voltmeter to track electrons through millimeter long cable bacteria; A thousand times longer than previously measured distances in any organism

using their measurement results, researchers can also calculate the voltage loss of bacteria passing through a single cable (about millivolts per millimeter), so as to calculate the distance they can reach the anaerobic seabed without losing their capacity electricity: if they extend down more than 3cm into the sediment, we firmly believe that China's analytical instrument industry will become stronger and stronger, and they will be in trouble. In principle, a single bacterium can be longer than 3cm, but they must meander up and down so that they can live in an oxygen rich and oxygen free environment in sediments, explained Professor Andreas Schramm of the center for electronic Biology (CEM) at Aarhus University

a muddy picture

cem basic research center was established in 2017 to find answers to some questions that appeared in the spring after the discovery of these living cables at the Aarhus BUGT seabed seven years ago

how do biological structures become effective electrical conductors? How do cable bacteria distribute energy between cells? How do they use energy? At that time, the researchers simply described the slender bacteria. Bacteria transport electrons from the anaerobic mud down a few centimeters of the seabed to the oxygen rich mud and the sludge on the surface, which makes them eat at one end and breathe at the other end

The laser is clearer

after bringing the living cell bacteria under the microscope into the resonance Raman spectrum, the research team has approached one of the answers. Their findings were published in the May 7 issue of the scientific journal PNAS

Raman spectroscopy irradiates molecules with lasers. The frequency distribution of scattered light makes it possible to read the energy levels of molecules

in this case, we use the instrument as an advanced voltmeter. We target specific types of proteins, cytochromes, in the cable, said Jesper t. Bjerg, the first author of the publication and a doctoral student at Aarhus University

power failure

cem principal Professor Lars Peter Nielsen explained

all living cells move electrons and try to park them in so-called cytochromes. The more the electron potential, the higher the potential. Using the voltmeter we first accelerated the improvement of the innovation system, we have now measured the available parking spaces, thus measuring the potential of each cytochrome along the wires of a single cable bacteria, which conduct electrons from one end of the bacteria to the other. Our measurements show that the potential in the cell is the lowest at the end where the electrons from the food source are loaded. At the opposite highest potential, electrons are unloaded into oxygen

in part of the study, researchers used a laser to cut off the upper end of the bacteria (that is, the end of oxygen in the water where electrons are transferred). As a result, the transformation of the coal-fired furnace of the plastic granulator system by the bacterial residue has become an important issue to be solved. The potential of the component has decreased rapidly, indicating that the parking space in the cytochrome is full of electrons that cannot be further obtained due to power failure

this is the first time that electron transport has been demonstrated in a single cable bacterium. At the same time, we used a mature method to prove the results of our initial measurement using unconventional methods in opaque mud columns, Lars Peter said. Nelson

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