Electricity-powered artificial root nodule.

08:00 EDT 20th March 2020 | BioPortfolio

Summary of "Electricity-powered artificial root nodule."

Root nodules are agricultural-important symbiotic plant-microbe composites in which microorganisms receive energy from plants and reduce dinitrogen (N) into fertilizers. Mimicking root nodules using artificial devices can enable renewable energy-driven fertilizer production. This task is challenging due to the necessity of a microscopic dioxygen (O) concentration gradient, which reconciles anaerobic N fixation with O-rich atmosphere. Here we report our designed electricity-powered biological|inorganic hybrid system that possesses the function of root nodules. We construct silicon-based microwire array electrodes and replicate the O gradient of root nodules in the array. The wire array compatibly accommodates N-fixing symbiotic bacteria, which receive energy and reducing equivalents from inorganic catalysts on microwires, and fix N in the air into biomass and free ammonia. A N reduction rate up to 6.5 mg N per gram dry biomass per hour is observed in the device, about two orders of magnitude higher than the natural counterparts.


Journal Details

This article was published in the following journal.

Name: Nature communications
ISSN: 2041-1723
Pages: 1505


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Medical and Biotech [MESH] Definitions

A small round or oval, mostly subcutaneous nodule made up chiefly of a mass of Aschoff bodies and seen in cases of rheumatic fever. It is differentiated from the RHEUMATOID NODULE which appears in rheumatoid arthritis, most frequently over bony prominences. (From Dorland, 27th ed)

Genus of BACTERIA in the family Frankiaceae. They are nitrogen-fixing root-nodule symbionts of many species of woody dicotyledonous plants.

Use of a metal casting, usually with a post in the pulp or root canal, designed to support and retain an artificial crown.

A single lung lesion that is characterized by a small round mass of tissue, usually less than 1 cm in diameter, and can be detected by chest radiography. A solitary pulmonary nodule can be associated with neoplasm, tuberculosis, cyst, or other anomalies in the lung, the CHEST WALL, or the PLEURA.

Devices intended to replace non-functioning organs. They may be temporary or permanent. Since they are intended always to function as the natural organs they are replacing, they should be differentiated from PROSTHESES AND IMPLANTS and specific types of prostheses which, though also replacements for body parts, are frequently cosmetic (EYE, ARTIFICIAL) as well as functional (ARTIFICIAL LIMBS).

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