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Creating Rapid Oxygen Oscillations in Microbial Single-cell Growth Analysis using a Microfluidic Double-layer Device
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Creating Rapid Oxygen Oscillations in Microbial Single-cell Growth Analysis using a Microfluidic Double-layer Device

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Oxygen limitation within a bacterial aggregate.

Aimee K Wessel, Talha A Arshad, Mignon Fitzpatrick

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    Summary
    This summary is machine-generated.

    Small bacterial aggregates, even those with fewer than 10(5) cells, show physiological differences due to localized oxygen depletion. This demonstrates chemical heterogeneity in microbial communities at the micrometer scale.

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    Tools for the Real-Time Assessment of a Pseudomonas aeruginosa Infection Model
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    Area of Science:

    • Microbiology
    • Biophysics
    • Chemical Ecology

    Background:

    • Bacterial biofilms exhibit physiological heterogeneity driven by chemical gradients.
    • Previous studies focused on large biofilms (>10^8 cells), leaving small aggregates (<10^5 cells) understudied.
    • Understanding heterogeneity in small aggregates is crucial as microbes initially form these structures.

    Purpose of the Study:

    • To investigate chemical and phenotypic heterogeneity in small bacterial aggregates.
    • To determine if oxygen gradients form within micrometer-scale bacterial populations.
    • To assess the impact of aggregate size on oxygen availability for Pseudomonas aeruginosa.

    Main Methods:

    • Utilized a three-dimensional (3D) printing strategy with gelatin to create picoliter-sized 3D microtraps.
    • Confined Pseudomonas aeruginosa within these microtraps, allowing nutrient and waste diffusion.
    • Monitored oxygen availability as bacterial populations grew within the microtraps.

    Main Results:

    • Localized oxygen depletion was observed in Pseudomonas aeruginosa aggregates.
    • This oxygen depletion occurred when clonal populations reached a critical aggregate size of approximately 55 picoliters.
    • Demonstrated chemical and phenotypic heterogeneity at the micrometer scale within small aggregate populations.

    Conclusions:

    • Chemical heterogeneity, specifically oxygen gradients, exists in small bacterial aggregates (≤10^5 bacteria).
    • Physiological heterogeneity is present in Pseudomonas aeruginosa aggregates, even at the micrometer scale.
    • This suggests that such heterogeneity is common in many naturally occurring small microbial populations.