P. occipitalis stores hydroquinone and hydrogen peroxide in separate glandular reservoirs and brings them together during an attack, allowing enzymes to produce defensive quinones and propellant gases. The origin of the beetle’s peroxide had remained uncertain, even though earlier research had identified laccase in its defensive chemistry. The new experiments support the proposal that laccase converts hydroquinone through radical intermediates in a pathway that also regenerates oxygen.

Evidence came from electron paramagnetic resonance spectroscopy and molecular docking, rather than from a direct measurement of peroxide production inside a living beetle. When hydroquinone was oxidized by free laccase, freeze-trapped EPR spectra detected a hydroquinone radical after five minutes and a p-hydroxycatechol radical after 15 minutes. Separate spin-trapping experiments identified DMPO adducts associated with hydroxyl, carbon-centered, and hydroperoxyl radicals.

The authors interpret these observations as evidence for several connected radical routes, including a secondary pathway in which hydroxyl radicals recombine to form hydrogen peroxide. The proposed mechanism differs from the conventional four-electron reduction of molecular oxygen to water by laccase. In the side pathway described by the researchers, molecular oxygen accepts one electron to form a hydroperoxyl radical, and two hydroperoxyl radicals can then generate one molecule of hydrogen peroxide while returning one molecule of oxygen.

A second oxygen-independent route involves homolytic cleavage of water, producing hydroxyl radicals and hydrogen atoms; collision of hydroxyl radicals can yield additional peroxide. At the same time, hydrogen atoms can recombine with hydroquinone semiquinone radicals, helping regenerate hydroquinone and extend the lifetime of reactive intermediates. These reactions form a proposed triple synergy among oxygen regeneration, hydrogen turnover, and catalysis by cerium.

For every mole of oxygen consumed through the single-electron route, the authors calculate that 1.5 moles can be regenerated within the local reaction environment: one through hydroperoxyl-radical disproportionation and another half through peroxide decomposition. This could lessen dependence on dissolved oxygen, whose concentration in water is limited. Molecular docking also indicated that hydroquinone and its chlorinated derivative can occupy the enzyme’s hydrophobic pocket, with calculated binding free energies of −4.6 and −5.1 kilocalories per mole, respectively.

These computational results support substrate compatibility but do not independently establish reaction rates in the animal. Because free enzymes are comparatively unstable and inefficient for sustained peroxide production, the team modified laccase and catalase with methoxy polyethylene glycol and co-immobilized them on cerium oxide–titanium dioxide composite supports. Transmission electron microscopy showed globular structures on cerium oxide after enzyme attachment, while X-ray photoelectron spectroscopy detected carbon and nitrogen associated with the enzymes and an increased proportion of Ce4+ relative to Ce3+.

The adsorption efficiencies were 38.89% for laccase and 72.78% for catalase, and the immobilized enzymes retained catalytic activity. Their reported activity half-lives were six to eight hours, although the study does not establish long-term durability beyond those observations. Cerium oxide contributes more than a physical support.

Its reversible Ce4+/Ce3+ redox couple acts as an electron shuttle, accepting electrons during hydroquinone oxidation and participating in subsequent reactions, while oxygen vacancies support gas exchange. Titanium dioxide contributes photosensitizing and radical-generating properties. The composite therefore combines structural protection, improved electron transfer, and catalytic assistance, whereas the oxygen-containing support may also help shield enzymes from damage associated with radical reactions and heat released during peroxide decomposition.

These are laboratory-scale chemical and materials results; the research did not quantify the power, efficiency, noise, service life, or environmental performance of a complete field-ready energy device. Inspired by the beetle’s compartmentalized anatomy, the researchers also fabricated a three-dimensional fractal microchannel catalyst bed by additive manufacturing. Its branching network was intended to distribute fluids more uniformly, reduce flow resistance, and improve mass transfer.

A pulsed cascade booster coordinates the bed with valves, a peroxide reservoir, a concentration sensor, a condenser’s heat-management function, and a catalase bed. When sensed peroxide falls below a preset threshold, hydroquinone is routed through the laccase bed to generate peroxide in a closed circulation loop. The operating sequence separates peroxide formation from its immediate use rather than requiring a reservoir of concentrated peroxide under high pressure.

Water and benzoquinone are recycled to the hydroquinone reservoir, where reduction of benzoquinone can restore the precursor for another cycle. The authors describe this arrangement as a way to reduce the safety risks of transporting and storing concentrated peroxide. It also resembles the biological division of labor in the beetle, where precursor storage, catalytic reaction, and jet output occur in separate compartments.

That similarity is a design principle, however, rather than evidence that the artificial system reproduces the speed, control, or endurance of the insect’s defense apparatus. Several qualifications remain important. Most experiments used hydroquinone, commercially sourced enzymes, and controlled laboratory mixtures, so the method does not yet demonstrate that all peroxide in P. occipitalis arises through the proposed pathway.

The claimed 191.79% peroxide concentration is a relative value referenced to a 1% hydroquinone benchmark, not a 191.79% pure hydrogen peroxide solution. The researchers also propose that radicals may recombine into peroxide, but the EPR spectra were interpreted through spin-trapping signals whose overlaps and cancellations can complicate assignment. The results therefore establish a laboratory-scale route for mild, on-demand peroxide production and utilization, while the complete energy device remains a proposed system whose practical performance was not quantified in the study.

Subject of Research: Beetle-inspired laccase catalysis for on-demand hydrogen peroxide generation and utilization

Article Title: Establishment of new energy supply construction inspired by the defensive mechanism of Pheropsophus occipitalis

Article References: Wang, L., Zhang, Y., Che, F., Yao, X., Yu, J., Li, W., Wang, R., & Yin, R. (2026). Establishment of new energy supply construction inspired by the defensive mechanism of Pheropsophus occipitalis. Frontiers in Chemistry, 14, Article 1831087. https://doi.org/10.3389/fchem.2026.1831087

Image Credits: AI Generated

DOI: 10.3389/fchem.2026.1831087

Keywords: hydrogen peroxide, biomimicry, laccase, hydroquinone, enzymatic catalysis, bombardier beetle, cerium oxide, titanium dioxide, radical chemistry, portable energy, biomimetic engineering, Establishment

The challenge the researchers set out to address is a real and persistent one in transfusion medicine. Red blood cells can be stored refrigerated for only a limited window before they lose quality, which is why cryopreservation, freezing cells at ultra-low temperatures, is used to keep rare blood types available for years until a matching patient needs them. The conventional approach relies on glycerol, a chemical that penetrates the cells and prevents the formation of ice crystals, the sharp structures that would otherwise pierce and shred cell membranes during freezing and thawing. Glycerol works, but it comes with a catch: before a frozen unit of blood can be transfused, the glycerol must be washed out of the cells, and that removal step itself inflicts damage on a fraction of the precious cells it was meant to protect.

Enter the tardigrade. When conditions turn lethal, these animals deploy a suite of protective molecules, including a remarkable family of proteins known as CAHS, short for cytosolic abundant heat-soluble proteins. These proteins help tardigrades endure extreme dehydration and freezing by forming protective structures inside their cells. What makes CAHS proteins especially interesting for biotechnology is their unique interaction with trehalose, a naturally occurring sugar that stabilizes cell membranes and proteins. Trehalose is already familiar in other industries; it is commonly used to reduce freezer burn in frozen foods, a testament to its ability to shield biological material from the stresses of low temperatures. Hui Yang, Leming Sun, and their colleagues reasoned that if tardigrades use CAHS proteins and trehalose together to survive the unsurvivable, the same combination might protect mammalian cells in the freezer.

“This study was our first attempt to translate a lesson from an extraordinarily resilient organism into a practical cell-preservation strategy,” explains Sun, one of the corresponding authors of the study. “If further developed, it could make the process simpler after thawing, reduce concerns associated with residual glycerol, and help preserve the quality of stored cells.” That framing captures the spirit of the work: rather than inventing a protective chemistry from scratch, the team reverse-engineered a solution that evolution had already validated in one of nature’s most extreme survivors.

The technical details of the approach reveal careful optimization. Rather than working with the full-length CAHS protein, the researchers determined that a specific section, or motif, of the protein was sufficient to deliver the protective effect they needed. This kind of reduction matters for practical applications, since shorter peptide segments are easier and cheaper to produce, characterize, and quality-control than large, complex proteins. The team combined this CAHS-derived segment with trehalose at low temperature, a step that encourages the sugar to load into the cells, and then plunged the samples into liquid nitrogen for freezing.

What happened at the molecular level during that freeze is the heart of the discovery. The combination of the CAHS motif and trehalose changed the way ice formed and melted within and around the cells, suppressing the ice damage that normally destroys frozen blood. In other words, the tardigrade-derived system did not simply replace glycerol as an antifreeze additive; it actively restructured the freezing process itself, creating a gentler environment for the delicate red blood cell membranes. And when the cells were thawed, the protective cocktail proved easy to remove: a simple wash by centrifugation was enough to clear away the CAHS-trehalose mixture, eliminating the multi-step glycerol removal that burdens the conventional workflow.

The numbers tell a compelling story. Up to 89 percent of mouse red blood cells preserved with the new tardigrade-inspired method recovered fully after freezing and thawing, compared with roughly 82 percent of cells frozen using the standard glycerol protocol. That seven-percentage-point improvement may sound modest, but in the context of a blood supply, where every unit matters and rare types can be desperately hard to match, recovering more usable cells from each frozen unit translates directly into more transfusions for patients. It also means less waste of donated blood, a resource that depends entirely on volunteer donors and cannot be manufactured.

Recovery rates alone, however, are not enough to justify a new clinical approach. Transfused cells must be safe as well as abundant. To test this, the team evaluated whether the cryopreserved blood cells remained biocompatible after being frozen, thawed, and washed. The answer was encouraging on both counts. In a live-animal model, anemic mice that received transfusions of the cryopreserved blood showed significantly improved red blood cell counts and hemoglobin levels, confirming that the thawed cells were not just intact but functionally capable of doing their oxygen-delivery job. Just as importantly, the transfusions did not trigger an inflammatory response, a critical safety signal indicating that the treated cells did not provoke the immune system of the recipients.

The implications reach beyond the blood bank. The researchers hope their work will inform the design of better cryopreservation strategies more broadly, potentially protecting other cell types and tissues that are currently difficult to freeze without heavy losses. They also point toward an even more ambitious goal: protective strategies that could keep blood viable at room temperature, which would transform logistics in regions where maintaining a cold chain, let alone a liquid nitrogen supply, is expensive or impractical. A tardigrade-inspired formulation that guards cells across temperature extremes is a natural starting point for that vision, since the proteins it derives from evolved precisely to bridge the gap between wet and dry, frozen and thawed.

For now, the work stands as a striking example of biomimicry at the molecular scale, a reminder that some of the best engineering solutions have already been debugged by nature over hundreds of millions of years. The study received funding from the National Natural Science Foundation of China, the Guangdong Basic and Applied Basic Research Foundation, and the Natural Science Basic Research Plan in Shaanxi Province of China. From here, translating the mouse results into human blood banking will require further development and validation, but the conceptual leap is complete: a protein motif from an animal that shrugs off the vacuum of space has shown it can help something as ordinary, and as vital, as a bag of donated blood survive the deep freeze. If the tardigrade’s trick continues to perform as it scales, the water bear may soon earn a place in hospitals, quietly keeping rare blood types ready for the patients who need them.

Subject of Research: Tardigrade-derived CAHS proteins for glycerol-free cryopreservation of red blood cells

Article Title: A trick from tardigrades could help human blood withstand freezing

Article References: A trick from tardigrades could help human blood withstand freezing. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: tardigrades, cryopreservation, red blood cells, CAHS proteins, trehalose, glycerol, blood banking, transfusion medicine, ice crystal formation, biomimicry, ACS Applied Materials & Interfaces, anemic mice

The sun beetle larva served as more than a source of inspiration in name only. Its gut is functionally compartmentalized: the midgut excels at hydrolyzing complex plant polymers and fermenting the resulting sugars into volatile fatty acids (VFAs), while the hindgut hosts methanogenic archaea that consume these intermediates and release methane. The research team, led by Bruna G. Schroeder and corresponding author Marcell Nikolausz, translated this spatial division of labor into hardware. Three stirred tank reactors were connected in series and operated at 37 degrees Celsius. The first two vessels were configured to emulate the larval midgut, favoring hydrolysis and acidification, while the third was optimized to mirror the hindgut environment and promote methanogenesis.

A key design feature was the inclusion of polyurethane foam inserts within the reactors. These porous carriers provide surface area for microbial attachment, helping to retain slow-growing cellulolytic and methanogenic organisms that would otherwise be washed out at practical hydraulic loading rates. Retaining biomass is a persistent challenge in anaerobic digestion of particulate substrates such as straw, where solids residence time and microbial residence time must be decoupled to keep the process stable. The foam carriers, together with the serial configuration, were intended to create distinct ecological niches along the reactor train, just as the different gut compartments do in the insect.

The system was fed semi-continuously with ground wheat straw suspended in an alkaline medium, and the reactors were inoculated with enrichment cultures derived directly from the midgut and hindgut of sun beetle larvae. Three operating conditions were tested with increasing organic loading rates, allowing the team to probe how the system responded when the microbial community was pushed to process more substrate per unit volume and time. This semi-continuous regime, rather than batch operation, was crucial for assessing whether a beetle-inspired design could function under realistic conditions approaching those of an industrial digester.

The results revealed a clear trade-off between throughput and conversion efficiency. The highest conversion of biomass to methane occurred at the lowest organic loading rate and the longest retention time. Under that regime, the process achieved a methane yield of 148 milliliters under normal conditions per gram of volatile solids, with volatile solids degradation reaching 44 percent. While these figures remain below the yields obtainable from pre-treated or co-digested straw in conventional systems, they are notable because the process relied on mono-digestion of untreated, merely ground straw, without thermochemical pretreatment, enzymatic additives, or co-substrates that typically inflate costs and complexity.

Molecular monitoring of the microbial communities showed that the reactor ecosystems had been shaped decisively in favor of lignocellulose degradation. Bacterial taxa enriched in the system included families well known for cellulose and hemicellulose deconstruction, among them Dysgonomonadaceae, Lachnospiraceae, Marinilabiliaceae and Ruminococcaceae. These organisms collectively attack the crystalline cellulose and hemicellulosic fractions of straw, hydrolyzing them into sugars that are then fermented into VFAs such as acetate, propionate and butyrate. The staged design allowed hydrolytic and acidogenic populations to dominate the first two reactors while shielding the methanogenic stage from fluctuations in substrate supply, echoing the physiological separation observed along the beetle larva gut.

The archaeal side of the story proved equally dynamic. Over the course of operation, the methanogenic community shifted from a predominance of Methanosarcina, a metabolically versatile genus capable of both acetoclastic and hydrogenotrophic methanogenesis, toward Methanobacterium and Methanoculleus, two genera that rely primarily on hydrogen and carbon dioxide to produce methane. This shift suggests that the hydrogenotrophic route became the dominant methane-forming pathway as the system matured, a pattern often associated with stable syntrophy between fermenting bacteria and methanogens under lignocellulose-fed conditions.

Perhaps the most broadly significant finding emerged when the authors compared their system with other straw-utilizing bioreactors reported in the literature. Across studies that differ widely in inoculum source and process conditions, a consistent core microbiome composed of the phyla Firmicutes, Bacteroidetes and Proteobacteria appears to underpin the anaerobic digestion of lignocellulose-rich materials. This convergence implies that engineers need not obsess over sourcing exotic inocula for straw digestion; instead, process design and operating conditions can steer a functionally equivalent core community toward efficient performance. For a field where inoculum provenance is often treated as a make-or-break variable, the demonstration that the same three phyla repeatedly carry out the work is a unifying insight.

The authors conclude that the beetle-inspired cascade was stable throughout operation and capable of converting wheat straw into both methane and carboxylates, the latter representing valuable platform chemicals for a range of industrial applications. Because VFAs can be harvested as products in their own right, the staged configuration opens the door to a dual-product strategy: acids from the front end, biogas from the back end. At the same time, the team is candid about the system’s limitations. Methane yields must rise for economic viability, and further adaptations are suggested to improve anaerobic digestion performance while decreasing both assembly and operating costs. Refinements might include longer acclimation periods, improved biomass retention, or mild pretreatment strategies compatible with the biomimetic concept.

Beyond its immediate numbers, the study demonstrates the practical power of biomimicry in bioprocess engineering. Rather than copying a single enzyme or microbe from an insect, the researchers copied an architecture, a compartmentalized flow scheme in which hydrolysis, acidification and methanogenesis each receive their own optimized habitat. As global agriculture generates hundreds of millions of tonnes of straw annually and biogas seeks robust pathways away from energy crops and food competition, designs that let nature’s own lignocellulose specialists, from beetle larvae to their gut microbes, guide reactor engineering could help turn one of farming’s most underused residues into a dependable feedstock for renewable energy and green chemistry.

Subject of Research: A biomimetic three-stage anaerobic digestion system inspired by the sun beetle larva gut for converting wheat straw into volatile fatty acids and biogas.

Article Title: Anaerobic mono-digestion of wheat straw in a three-stage semi-continuous system inspired by a beetle larva gut

Article References: Schroeder, B. G., Bhattacherjee, R., Bonatelli, M. L., da Rocha, U. N., Sträuber, H., Harms, H., & Nikolausz, M. (2026). Anaerobic mono-digestion of wheat straw in a three-stage semi-continuous system inspired by a beetle larva gut. Biotechnology for Biofuels and Bioproducts, 19(1), Article 70. https://doi.org/10.1186/s13068-026-02819-6

Image Credits: AI Generated

DOI: 10.1186/s13068-026-02819-6

Keywords: anaerobic digestion, wheat straw, biomimicry, Pachnoda marginata, gut microbiome, biogas, volatile fatty acids, lignocellulosic biomass, methanogenesis, carboxylates, bioenergy, microbiome