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Bacterial Signaling

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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...

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Bacterial Hybrid Light-Emitting Diodes.

Sara Ferrara¹, Stephanie Willeit¹, Juan Pablo Fuenzalida-Werner¹

¹Technical University of Munich, TUM Campus Straubing for Biotechnology and Sustainability, Chair of Biogenic Functional Materials, Schulgasse, 22, 94315, Straubing, Germany.

Advanced Materials (Deerfield Beach, Fla.)

|October 9, 2024

Summary

This summary is machine-generated.

This study introduces bacteria-based photon down-converting filters for energy-efficient lighting. These living materials offer a cost-effective, recyclable alternative to traditional filters, overcoming previous stability and fluorescence challenges.

Keywords:

bio‐phosphor engineered living materials hybrid light‐emitting diodes photon management spheroplast

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Area of Science:

Materials Science
Biotechnology
Photonics

Background:

Photon down-converting filters using fluorescent proteins (FPs) are explored for rare-earth-free, non-toxic color filters in LEDs.
Challenges include high FP purification costs and lack of recyclability.
Direct use of bacteria in Engineering Living Materials (ELMs) for photon manipulation is hindered by autofluorescence, scattering, and low stability.

Purpose of the Study:

To develop a cost-effective and sustainable method for photon down-conversion in lighting applications.
To overcome the limitations of using bacteria in Engineering Living Materials (ELMs) for photon manipulation.
To create the first bacteria-hybrid light-emitting diodes (LEDs) utilizing ELMs for photon conversion.

Main Methods:

Developed a protocol to prepare living bacterial spheroplasts with significantly reduced scattering (>90%).
Ensured high fluorescent protein (FP) expression while maintaining photoluminescence properties.
Integrated these spheroplasts into polymer films, assessing their stability under ambient conditions for over a year.

Main Results:

Achieved >90% reduction in scattering from living spheroplasts.
Maintained high FP photoluminescence figures-of-merit in the engineered bacteria.
Demonstrated excellent resilience of spheroplasts in polymer films over 1 year of ambient storage.
Successfully prepared the first bacteria-hybrid LEDs incorporating ELMs for photon conversion.

Conclusions:

This work presents the first successful protocol for bacteria-polymer photon manipulation using ELMs.
Introduced a novel living lighting concept with bacteria-based photon conversion.
Demonstrated a cost-effective strategy with active FP recycling through spheroplast recultivation, offering similar stability to purified FP filters.