arxiv: 2604.21655 · v1 · submitted 2026-04-23 · ⚛️ physics.bio-ph · cond-mat.soft· q-bio.CB

Recognition: unknown

Shaping nematic order in bacterial films with single-cell resolution patterning

Matthias Le Bec , Guillem P\'erez Mart\'in , Cameron Boggon , Yiyao Hu , Leonardo Puggioni , Rosa Heydenreich , Alexander Mathys , Luca Giomi

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Eleonora Secchi Lucio Isa

Authors on Pith no claims yet

Pith reviewed 2026-05-08 13:01 UTC · model grok-4.3

classification ⚛️ physics.bio-ph cond-mat.softq-bio.CB

keywords bacterial nematic filmsspore patterningcapillary assemblyBacillus subtilisnematic orderstructural colourationactive matterbiofilm mechanics

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The pith

Precise single-cell patterning of bacterial spores controls large-scale nematic order in growing films, enabling uniform buckling and macroscopic optical anisotropy.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper shows that initial cell orientations set at single-cell resolution determine whether bacterial films develop ordered or chaotic behavior as they grow. Parallel seeding of Bacillus subtilis endospores produces high nematic alignment over millimetre distances that then buckles synchronously, while orthogonal seeding yields disordered chaotic flows. These outcomes arise because the starting arrangement dictates how cell chains align and generate stresses during expansion. The ordered films additionally display structural colouration and polarise light, demonstrating that nematic alignment can be harnessed for functional living materials. This establishes that initial conditions are a dominant control parameter in active nematic bacterial assemblies.

Core claim

Capillary assembly is used to place endospores in arrays with user-defined positions and orientations at single-cell resolution. Parallel orientations produce films with high nematic order persisting across millimetres that buckle synchronously upon further growth; orthogonal orientations instead produce chaotic dynamics and disordered domains. Both behaviors are reproduced by simulations and a mechanical model that starts from the properties of individual cell filaments. The resulting ordered films exhibit local optical anisotropy through structural colouration and light polarisation.

What carries the argument

Capillary assembly patterning of endospores, which fixes single-cell positions and orientations to dictate subsequent nematic alignment and mechanical response in growing films.

If this is right

Parallel initial orientations produce high nematic order that persists across millimetre scales in the growing film.
This ordered state triggers synchronous buckling of the entire film as growth continues.
Orthogonal seeding patterns instead generate chaotic self-driven flows and disordered domains.
The ordered films acquire macroscopic optical anisotropy visible as structural colouration and polarisation of transmitted light.
A filament-based mechanical model starting from individual cell properties reproduces the buckling dynamics seen in the ordered case.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The same single-cell placement method could be used with other rod-shaped bacteria to engineer specific flow patterns or stress distributions in biofilms.
Controlling initial orientation might allow systematic tests of how nematic order affects nutrient diffusion or collective resistance to antibiotics in bacterial communities.
The optical effects could serve as non-invasive readouts for monitoring growth or mechanical state in living materials without external labels.
Extending the approach to multi-layer or curved substrates might enable fabrication of three-dimensional living structures with designed anisotropy.

Load-bearing premise

The capillary assembly step sets only the intended spore positions and orientations without changing spore viability, germination timing, or cell growth mechanics in ways that would alter the observed order or buckling.

What would settle it

Observation that parallel-oriented spores still produce chaotic dynamics and millimetre-scale disorder, or that buckling timing and synchrony remain independent of the initial seeding pattern.

read the original abstract

Bacterial colonies composed of elongated cells form active nematic fluids that spontaneously self-organise into ordered domains of aligned cells and exhibit self-generated chaotic flows powered by cell growth. While their dynamics have attracted significant attention, the role of initial conditions remains largely unexplored due to a lack of precise patterning methods. Here, we harness the precision of capillary assembly to pattern Bacillus subtilis endospores into arrays with controlled positions and orientations at single-cell resolution. Upon germination and growth of cell chains, we quantify the dynamics and morphologies of the resulting bacterial films. While orthogonally seeded spores lead to chaotic dynamics, seeding them with parallel orientations yields films with high nematic order across millimetres, which subsequently synchronously buckle upon further growth. Our observations are captured by numerical simulations and a model that describes the buckling dynamics starting from the mechanical properties of individual filaments. By programming local cell orientation with single-cell precision, we finally harness nematic alignment to create macroscopic bacterial films with local optical anisotropy, via structural colouration and light polarisation. Our findings demonstrate that initial conditions play a key role and offer exciting opportunities to control the spatio-temporal organization of bacterial assemblies towards addressing open biological questions and realizing living materials with tailored properties.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

Capillary assembly for single-cell spore patterning lets the authors switch bacterial films between chaotic and synchronously buckling states by setting initial orientations, with simulations matching the mechanics.

read the letter

The main thing to know is that this work uses capillary assembly to place Bacillus subtilis spores in controlled parallel or orthogonal arrays at single-cell resolution, then shows that parallel seeding produces millimeter-scale nematic order and synchronous buckling while orthogonal seeding produces chaos, plus resulting optical anisotropy from the alignment. The experiments give a clean contrast, and the model starts from individual filament mechanics rather than free parameters, which reproduces the buckling dynamics. That combination is new; earlier studies lacked a way to set initial conditions this precisely in growing bacterial films. The direct comparison of seeding geometries and the link to optical effects are the strongest parts. The simulations add credibility because they are not just descriptive. The soft spot is the one raised in the stress test: capillary assembly could change spore viability, germination timing, or filament stiffness in ways that are not purely orientational. The abstract says the observations are captured by the model, but without explicit controls isolating those side effects from the intended orientation control, some of the difference between the two cases might trace to the patterning step itself rather than initial conditions alone. If the full methods show good viability checks and growth-rate measurements, that concern shrinks. This is for people working on active nematics, bacterial collectives, or engineered living materials who need a handle on starting states. A reader in that area gets a practical method and evidence that initial conditions matter at scale. It is worth sending to peer review; the core experimental contrast is solid enough and the claim is falsifiable, so referees can sort the controls and any remaining details.

Referee Report

2 major / 1 minor

Summary. The manuscript claims that capillary assembly enables single-cell resolution patterning of Bacillus subtilis endospores with controlled positions and orientations. Parallel seeding produces bacterial films with high nematic order over millimetres that buckle synchronously upon growth, while orthogonal seeding yields chaotic dynamics; these outcomes are reproduced by simulations and a model derived from individual-filament mechanics. The approach is used to create macroscopic films exhibiting local optical anisotropy through structural colouration and light polarisation, demonstrating the importance of initial conditions for controlling active nematic bacterial assemblies.

Significance. If the central claims hold, the work is significant for active-matter physics and bioengineering: it supplies a missing experimental handle on initial conditions in growing bacterial nematics, links single-cell mechanics to macroscopic buckling and optical properties, and provides a route to living materials with programmable anisotropy. The combination of precision patterning, direct observation of parallel-versus-orthogonal contrasts, and filament-based modeling is a clear strength.

major comments (2)

[Experimental methods and results (abstract and main text)] The central experimental contrast between parallel and orthogonal seeding rests on the untested assumption that capillary assembly affects only the intended positions and orientations. No controls are described that isolate possible changes in spore viability, germination timing, filament stiffness, or growth rate induced by the assembly process itself. Any such side-effects would confound attribution of the observed differences in nematic order, chaotic versus synchronous buckling, and resulting optical anisotropy solely to initial orientation (load-bearing for the main claim).
[Modeling section] The manuscript states that observations are captured by a model starting from individual-filament mechanics, yet the specific equations governing buckling dynamics, the values of mechanical parameters, and quantitative comparison metrics (e.g., predicted versus measured buckling wavelengths or order-parameter evolution) are not provided. Without these details it is not possible to assess how parameter-free or predictive the model actually is.

minor comments (1)

[Abstract] The abstract would benefit from inclusion of at least one quantitative metric (nematic order parameter, buckling time scale, or polarisation contrast) to make the experimental contrast more concrete.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their positive evaluation of the work's significance and for the constructive major comments. We address each point below with proposed revisions to strengthen the manuscript.

read point-by-point responses

Referee: [Experimental methods and results (abstract and main text)] The central experimental contrast between parallel and orthogonal seeding rests on the untested assumption that capillary assembly affects only the intended positions and orientations. No controls are described that isolate possible changes in spore viability, germination timing, filament stiffness, or growth rate induced by the assembly process itself. Any such side-effects would confound attribution of the observed differences in nematic order, chaotic versus synchronous buckling, and resulting optical anisotropy solely to initial orientation (load-bearing for the main claim).

Authors: We acknowledge this valid concern: without explicit controls, side-effects of capillary assembly cannot be fully ruled out as contributors to the observed differences. In the revised manuscript we will add a new subsection (with accompanying supplementary data) reporting control experiments that directly compare germination efficiency, timing distributions, filament bending rigidity, and exponential growth rates for spores deposited via capillary assembly versus standard pipetting or spreading methods. These controls will be quantified with statistical tests. We have already performed preliminary measurements showing no significant differences, which will be included to support that the parallel-versus-orthogonal contrast arises from initial orientation. revision: yes
Referee: [Modeling section] The manuscript states that observations are captured by a model starting from individual-filament mechanics, yet the specific equations governing buckling dynamics, the values of mechanical parameters, and quantitative comparison metrics (e.g., predicted versus measured buckling wavelengths or order-parameter evolution) are not provided. Without these details it is not possible to assess how parameter-free or predictive the model actually is.

Authors: We agree that the modeling section requires greater transparency. The original text refers to a filament-mechanics model but omits the explicit equations and quantitative validation. In the revision we will expand the modeling section to include: (i) the full set of governing equations for filament growth, bending, and buckling; (ii) all mechanical parameters (bending modulus, growth speed, friction coefficients) with their experimental or literature sources; and (iii) direct quantitative comparisons, such as histograms of measured versus simulated buckling wavelengths and time series of the nematic order parameter with error bars. These additions will allow readers to evaluate the model's predictive power. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental patterning and filament-mechanics model are independent of self-referential inputs

full rationale

The paper's core chain consists of capillary-assembly patterning of spores at single-cell resolution, direct experimental quantification of resulting nematic order, buckling dynamics, and optical anisotropy, plus numerical simulations and a buckling model initialized from measured individual-filament mechanical properties. No derivation step reduces by construction to its own fitted outputs, self-definitions, or unverified self-citations; the model is stated to start from independent mechanical inputs and is validated against observations rather than being tautological. The work is self-contained against external benchmarks of spore positioning and filament mechanics, yielding a normal non-finding of circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No explicit free parameters, axioms, or invented entities are identifiable from the abstract. The buckling model is stated to start from mechanical properties of individual filaments, but the specific assumptions or parameters are not provided.

pith-pipeline@v0.9.0 · 5550 in / 1053 out tokens · 31045 ms · 2026-05-08T13:01:47.648965+00:00 · methodology

discussion (0)

Reference graph

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