The study, led by Seyedeh Elnaz Mousavi of the Social Determinants of Health Research Center at Zanjan University of Medical Sciences together with colleagues from several Iranian institutions, focused on a population that clinicians frequently see but rarely study in isolation: adolescents with subclinical body dysmorphic disorder. These are young people whose appearance-related distress is real and impairing but falls just short of the formal diagnostic cutoff. The researchers recruited 62 participants aged 12 to 18 years in Zanjan, each of whom met the study’s operational definition of subclinical BDD, namely a Clinical Severity Rating of 2 or 3 on the Anxiety Disorders Interview Schedule for Children, a structured diagnostic instrument. A rating in that range signals clinically meaningful distress below the threshold of 4 that typically denotes a full disorder, making this group a natural target for early intervention aimed at preventing progression.

What distinguishes this trial from much of the existing treatment literature is its choice of therapeutic framework. Rather than deploying a protocol designed specifically for body dysmorphic disorder, the team tested the Unified Protocol for Adolescents, known as UP-A, a transdiagnostic cognitive-behavioral treatment built on the premise that emotional disorders share common underlying mechanisms. The UP-A targets neuroticism, aversive reactivity to emotions, and maladaptive emotion regulation strategies rather than the surface symptoms of any single diagnosis. In this trial, the twelve-session intervention was delivered entirely online, a delivery mode with obvious practical advantages for reaching adolescents who may be reluctant to attend in-person mental health services or who live far from specialized clinics.

The design was a parallel-group superiority trial with a 1:1 allocation ratio. Half of the participants were randomly assigned to the UP-A intervention and half to a waitlist control group, which received educational pamphlets after the assessment phase. Evaluations took place at three time points: baseline, immediately after the two-month intervention period, and again at six-month follow-up. The researchers measured four domains using validated instruments: self-focused attention with the Focus of Attention Questionnaire, dysmorphic concerns with the Dysmorphic Concerns Questionnaire, depressive symptoms with the Hamilton Depression Rating Scale, and social adjustment with the relevant subscale of the Adjustment Inventory for School Students. Statistical analysis relied on marginal longitudinal models, which can track change over time within individuals while formally testing differences between groups.

The headline result is striking in its clarity. Adolescents who completed the UP-A program showed significantly greater reductions in both self-focused attention and BDD symptoms compared with their waitlisted peers, and these between-group advantages held at both the post-test assessment and the six-month follow-up, with statistical significance at the conventional threshold of P less than 0.05. Self-focused attention, the habitual tendency to direct attention inward toward one’s own perceived flaws and bodily sensations, is considered a core maintaining mechanism across the emotional disorders, and its reduction is precisely what the Unified Protocol is engineered to accomplish. The durability of these gains six months after the final session suggests that the skills taught in the protocol, which include mindful emotion awareness, cognitive flexibility, and countering avoidance behaviors, were not merely palliative but were internalized by the participants.

The picture for social adjustment was more nuanced. The marginal longitudinal model detected a significant group-by-time interaction at post-test, with a beta coefficient of negative 1.83 and a P value below 0.001, indicating an acute improvement in social functioning within the intervention group. Yet when the researchers compared the two groups directly at the post-test time point, the difference did not reach statistical significance, with a P value of 0.29, and the same held true at the six-month follow-up, where the P value was 0.40. The authors interpret this pattern as evidence of gradual improvement in social adjustment rather than an immediate and decisive separation between the treated and untreated groups. In practical terms, the therapy appears to set adolescents on a positive trajectory in their social lives, but that trajectory takes time to diverge clearly from what happens among untreated peers.

Depression proved the most stubborn target. Within the intervention group, depressive symptoms as measured by the Hamilton scale did improve significantly over the course of the study, a within-group change that reached statistical significance. However, when the treated adolescents were compared against the waitlist controls, the between-group differences were not statistically significant either at post-test, where the P value was 0.34, or at follow-up, where it was 0.11. In other words, some of the improvement in mood observed among treated participants may have reflected the passage of time, natural remission, or nonspecific factors such as receiving attention and completing assessments, rather than the specific effects of the UP-A protocol itself. The trial’s authors are candid about this limitation, concluding that the specific clinical efficacy of the intervention in reducing comorbid depressive symptoms beyond waitlist and temporal effects was not supported by their data.

This mixed outcome carries real clinical weight. Body dysmorphic disorder rarely travels alone; it is frequently accompanied by major depression, social anxiety, and suicidal ideation, and the presence of comorbid depression is one of the strongest predictors of poor outcomes. A treatment that reliably dismantles the appearance preoccupation and the self-focused attention that fuels it, but that leaves depressive symptoms largely untouched, is a partial victory. The authors themselves emphasize the need for targeted clinical monitoring of depressive symptoms in this population, a recommendation that effectively argues for a stepped or combined care model in which transdiagnostic therapy addresses the core BDD mechanisms while depression is assessed and, when necessary, treated with adjunctive approaches.

The trial also contributes to a broader and increasingly urgent conversation about early intervention. Subclinical presentations of body dysmorphic disorder are common in adolescence, and a substantial proportion of affected individuals go on to develop the full disorder, which is associated with hospitalization, cosmetic surgery seeking, and elevated suicide risk. Intervening at the subclinical stage, before rigid rituals such as mirror checking and camouflaging become entrenched, could alter the natural history of the condition. The fact that a scalable, online, twelve-session protocol produced durable reductions in dysmorphic concerns among this age group is therefore significant for public health planning, particularly in settings where specialized BDD clinics are scarce. The online delivery format tested here could, in principle, be extended to school-based screening and intervention programs.

Certain caveats deserve attention when weighing the findings. The control condition was a waitlist rather than an active comparison treatment, which means the trial cannot establish whether the UP-A outperforms disorder-specific CBT or other structured psychological interventions; it demonstrates efficacy relative to no treatment. The sample of 62 participants, while adequate for the primary comparisons, limits the precision of estimates for secondary outcomes such as depression and social adjustment, where the observed differences hovered near the significance boundary. All participants were drawn from a single Iranian city, and cultural factors shaping body image concerns may influence generalizability. The trial was registered in the Iranian Registry of Clinical Trials and received no external funding, and the authors declared no competing interests. Even with these limitations, the study stands as one of the few randomized tests of a transdiagnostic approach in adolescents with body image pathology, and its central message is likely to resonate with clinicians: treating the shared emotional mechanisms underlying distress can quiet the mirror-obsessed mind of a struggling teenager, but the darkness of comorbid depression may require its own deliberate light.

Subject of Research: Transdiagnostic cognitive-behavioral therapy for adolescents with subclinical body dysmorphic disorder

Article Title: Effect of transdiagnostic therapy on psychological variables and symptoms of adolescents with sub-clinical body dysmorphic disorder: a randomized clinical trial

Article References: Mousavi, S. E., Sarani Yaztappeh, J., Kalke, Y. M., Saed, O., & Javadi, V. (2026). Effect of transdiagnostic therapy on psychological variables and symptoms of adolescents with sub-clinical body dysmorphic disorder: a randomized clinical trial. Annals of General Psychiatry. https://doi.org/10.1186/s12991-026-00696-9

Image Credits: AI Generated

DOI: 10.1186/s12991-026-00696-9

Keywords: body dysmorphic disorder, adolescents, transdiagnostic therapy, Unified Protocol, cognitive behavioral therapy, self-focused attention, social adjustment, depressive symptoms, randomized clinical trial, mental health, Effect, transdiagnostic

The motivation for the work is grounded in one of the largest waste streams on the planet. The global textile sector generates more than 92 million tons of waste annually, and denim, composed primarily of cotton cellulose fibers, makes up a significant share of both post-consumer and post-industrial textile refuse. While recycling initiatives have improved diversion rates in recent years, a substantial fraction of this material is still landfilled, contributing to soil contamination, groundwater pollution, and greenhouse gas emissions. Recycling textile waste is technically difficult because fabrics are heterogeneous, often blended, and laced with chemical additives from processing. Yet embedding waste textile fibers into polymer matrices has emerged as a promising strategy to transform low-value waste into functional materials for structural, thermal, and acoustic applications.

Denim has particular appeal as a reinforcement. Its woven structure, high fiber content, and residual mechanical integrity allow recycled denim composites to achieve competitive performance compared with some conventional glass-fiber-reinforced systems, while offering clear sustainability advantages. Jute, meanwhile, is one of the most widely available and cost-effective natural fibers in the world, prized for its favorable stiffness and tensile strength among bast fibers. Hybridizing the two waste streams seemed like an obvious win. But there was a catch the researchers deliberately chose to confront: untreated jute fibers carry a surface burden of waxes, lignin, hemicellulose, and pectins that inhibit effective wetting and bonding with hydrophobic epoxy matrices. Chemical treatments such as alkali treatment, silane coupling, and acetylation can fix this problem, but they add cost, processing complexity, and chemical usage that erode the environmental logic of natural fiber composites in the first place.

The experimental design was elegantly simple. The team fabricated two laminates by hand lay-up, each containing identical amounts of epoxy resin, hardener, and recycled denim. The denim, a heavyweight 3/1 twill cotton fabric with an areal density of 300 to 400 grams per square meter, came from pre-consumer offcuts at jeans factories and was used as received, without washing or treatment. The jute, by contrast, was recovered from used and deteriorated jute bags, washed, solar-dried for two hours, and cut into short fibers roughly five to ten millimeters long. Five denim layers were stacked in each mold; in the hybrid version, 5.80 grams of untreated jute, about 1.7 percent of the laminate by weight, was first mixed into the epoxy resin and brushed between the denim plies. The laminates were compressed under a 30-kilogram load, cured for 72 hours at ambient conditions, and post-cured at 60 degrees Celsius for one hour, yielding final thicknesses of approximately 4.1 millimeters.

The mechanical results tell a story of good intentions colliding with interfacial chemistry. In tensile testing according to ASTM D3039, the denim-only composite achieved an ultimate tensile strength of 31.4 plus or minus 0.2 megapascals at a strain of 10.5 percent, exhibiting continuous strain hardening as the woven cotton yarns progressively straightened and reoriented under load. The jute-containing hybrid plateaued at just 25.2 plus or minus 0.3 megapascals, fracturing at less than half the strain. That represents a 19.5 percent reduction in strength and a 59 percent reduction in strain at maximum stress. The energy penalty was even more dramatic: numerical integration of the stress-strain curves showed the denim composite absorbed 2.69 megajoules per cubic meter up to peak stress, while the hybrid managed only 0.80, a roughly 70 percent loss in tensile energy absorption. Initial stiffness, by contrast, was nearly identical between the two materials, at around 1.3 gigapascals, indicating the jute only revealed its destructive influence once significant deformation began.

Flexural and impact testing confirmed the same pattern. In three-point bending, flexural strength fell from 67.8 plus or minus 3.4 megapascals for the denim composite to 55.5 plus or minus 4.6 megapascals for the hybrid, an 18 percent drop, while flexural modulus declined 13 percent, from 2,843 to 2,482 megapascals. Unnotched Charpy impact tests told the most sobering story: impact strength plummeted 33 percent, from 8.30 to 5.60 kilojoules per square meter. Poor adhesion between the untreated jute and the epoxy creates weak zones that act as stress concentrators under sudden loading, facilitating crack initiation, fiber pull-out, and premature fracture. The researchers note that in bending, the compressive half of the section and the denim layup partially mask the weak interface, whereas in pure tension the poorly bonded jute phase governs failure, which explains why the energy loss was so much larger in tensile loading.

Scanning electron microscopy of the fractured surfaces provided direct, visually compelling evidence for the mechanism. The denim-epoxy composite showed fibers well embedded in the matrix with good interfacial interaction, with matrix residue clinging to the cotton yarns and indicating effective load transfer. The hybrid composite told a different story: inadequate fiber wetting, extensive fiber pull-out, microvoids, and clean jute fiber surfaces with visible gaps at the interface, the microscopic fingerprints of debonding at low stress. The pulled-out jute appeared as split technical-fiber bundles, a phenomenon known as fibrillation, in which failure proceeds by separating elementary fibers held together by a pectin- and lignin-rich middle lamella rather than by fracturing the fiber itself. Because bundle splitting and pull-out dissipate little energy, these morphological features explain the early plateau in the tensile curves, the severe loss of energy absorption, and the depressed impact resistance of the hybrid material.

Interestingly, the thermal and moisture results were not uniformly negative for the jute hybrid. Thermogravimetric analysis showed both composites exhibited comparable degradation profiles, with the principal mass-loss region between 300 and 450 degrees Celsius and maximum decomposition rates at approximately 365 degrees Celsius for both. Differential scanning calorimetry revealed a main endothermic decomposition peak at 388.1 degrees Celsius for the denim composite and a slightly lower peak at 381.3 degrees Celsius for the hybrid, consistent with the earlier onset of hemicellulose decomposition in the jute phase. Notably, the hybrid retained 8.3 percent char residue at 600 degrees Celsius, while the denim-only composite was almost fully volatilized. Even more surprising, the hybrid absorbed less water, 5.60 percent versus 6.39 percent, and took longer to saturate, 384 hours versus 288 hours. The researchers attribute this to the jute-filled resin occupying the inter-yarn channels that otherwise act as wicking pathways in the denim-only laminate, rather than to the jute surface chemistry itself.

The practical upshot is a clear engineering directive rather than a dead end. The denim-epoxy composite, with its balanced property set, is well suited for low-to-moderate load-bearing, non-safety-critical applications such as furniture panels, interior partitions, automotive trim, packaging inserts, and equipment casings. The jute hybrid, with lower strength but slower water uptake and reduced porosity, may find a niche in indoor panels for humid environments where mechanical demands are modest. But the study’s most important contribution may be its cautionary message for the green materials movement: untreated jute fibers behaved as defect sites rather than reinforcements, and the literature the authors compiled shows that alkali, silane, or acetylation treatments can substantially improve jute-epoxy performance. Until surface treatment is incorporated, the authors conclude, the promise of denim-jute hybrid composites will remain unfulfilled, a reminder that in sustainable materials engineering, chemistry at the interface matters as much as the sustainability of the supply chain.

Subject of Research: The effect of untreated jute fiber incorporation on the mechanical, thermal, and hygroscopic properties of recycled denim-epoxy hybrid composites

Article Title: Effect of untreated jute fiber incorporation on the properties of recycled denim–epoxy hybrid composites

Article References: Hossen, R., Apu, M. U., Neha, T. R., Ahasan, E., Islam, M. R., & Mim, J. J. (2026). Effect of untreated jute fiber incorporation on the properties of recycled denim–epoxy hybrid composites. Results in Engineering, 32, Article 112828. https://doi.org/10.1016/j.rineng.2026.112828

Image Credits: AI Generated

DOI: 10.1016/j.rineng.2026.112828

Keywords: Effect, untreated, jute, fiber, incorporation, properties, recycled, denim, epoxy, hybrid, composites, scientific research

The study, led by Yuehua Geng and colleagues at Hebei University of Technology together with a collaborator at Tianjin Huanhu Hospital, rests on a growing body of evidence that the vestibular organs of the inner ear are exquisitely sensitive to magnetic fields. The dominant theory holds that the tiny crystals of calcium carbonate embedded in the vestibular system’s otoconia, which normally act as gravity sensors, behave faintly like magnets when exposed to strong, static or low-frequency magnetic fields. When a magnetic field is applied asymmetrically, these crystals experience forces that trick the brain into perceiving head movement that never happened. This is why patients emerging from high-field MRI scanners often report vertigo and involuntary eye movements called nystagmus. Rather than treating this effect as a nuisance, the researchers asked whether it could be harnessed deliberately, and in a controlled dose, to counteract the sensory conflict that gives rise to VIMS.

That conflict is thought to sit at the heart of motion sickness itself. When the eyes report swift, sweeping motion through a virtual landscape while the vestibular system reports a body sitting perfectly still, the brain receives mismatched signals about self-motion. The prevailing explanation, often framed through sensory conflict or postural instability theory, suggests that this discrepancy triggers the classic symptoms of nausea, dizziness, sweating, fatigue and headache. If magnetic vestibular stimulation can add a calibrated vestibular signal to the mix, the researchers reasoned, it might partially reconcile the conflicting streams of information, or at least shift the balance system’s set point in a way that reduces the perceived conflict. Conversely, an improperly tuned stimulation could add yet another discordant signal and make the sickness worse. The study was designed to test precisely this dose-dependence.

Twenty healthy young adults took part in a repeated-measures experiment in which each participant completed five separate sessions. One session served as a baseline control with no virtual reality exposure. In the remaining four, participants viewed VR videos known to provoke VIMS. During those VR sessions, magnetic vestibular stimulation was delivered at three different intensities, set at 90 percent, 100 percent and 110 percent of each individual’s resting motor threshold, a standard reference measure in brain stimulation research that personalizes the stimulation strength to the participant’s own nervous system. Anchoring the intensities to the resting motor threshold, typically measured by observing responses in hand muscles to transcranial magnetic stimulation, ensured that every participant received comparable relative doses despite natural variation in neural excitability between individuals.

To quantify how sick participants felt, the researchers used the Simulator Sickness Questionnaire, a widely adopted instrument that yields a total score along with subscores for nausea, oculomotor strain and disorientation. Questionnaires were administered before and after each session, allowing the team to compute symptom changes attributable to each experimental condition. In parallel, the researchers recorded resting-state electroencephalography after every session and analyzed the data using brain functional network analysis across multiple EEG frequency bands. This approach goes beyond simple power measurements, treating the brain as a network of interacting regions and computing parameters that describe how strongly and how efficiently those regions communicate at rest, from the slow delta and theta rhythms through alpha and beta up into the faster gamma range.

The symptom data told a strikingly non-linear story. Compared with VR exposure alone, stimulation at 110 percent of resting motor threshold was associated with a more favorable symptom profile on the Simulator Sickness Questionnaire, with participants reporting reduced sickness overall. Stimulation at 90 percent, however, showed the opposite pattern: it was associated with aggravated symptoms, leaving participants feeling worse than they did after VR alone. The intermediate 100 percent condition fell between these extremes. In other words, magnetic vestibular stimulation was not simply good or bad for motion sickness; its effect hinged critically on dose, with stronger stimulation appearing protective and weaker stimulation apparently compounding the sensory conflict rather than resolving it.

The EEG network analysis added a neurophysiological dimension to these behavioral findings. Although the authors describe these network results as exploratory, they observed session-related differences in functional network characteristics across multiple frequency bands. Notably, the patterns recorded after the 110 percent stimulation sessions generally resembled the baseline condition more closely than the patterns seen after VR exposure alone or with lower-intensity stimulation. This suggests that high-intensity magnetic stimulation may have helped the brain’s resting network organization recover toward its normal configuration after the disruptive VR experience, hinting that the subjective symptom relief tracked measurable changes in large-scale brain dynamics. Differences appeared in networks spanning several frequency ranges, consistent with the idea that vestibular input propagates widely through cortical and subcortical circuits that govern spatial orientation, autonomic responses and arousal.

The authors are careful to frame these conclusions within the limits of the study. The sample was small, consisting of twenty healthy young adults, and the network-level EEG findings are exploratory rather than definitive. The researchers explicitly state that their findings should be confirmed in larger studies before any clinical or consumer applications are pursued. Individual differences in inner-ear anatomy, the orientation of the labyrinth relative to the applied field, and personal susceptibility to motion sickness are all known to modulate responses to magnetic vestibular stimulation, and these variables would need systematic attention in follow-up work. The protocol also involved repeated sessions, and the authors’ funding came from the CAS Superconducting Research Project and the Hebei Natural Science Foundation, reflecting the superconducting magnet technology underlying the stimulation approach.

Even with those caveats, the implications are considerable. If the dose-dependence holds up in larger trials, the study points toward a design principle rather than a single fix: vestibular stimulation for motion sickness must be calibrated individually, and getting the dose wrong could actively harm the user experience. A future VR headset or clinical device might one day pair with a magnetic stimulation module that tunes intensity to a user’s resting motor threshold, offering a drug-free, non-invasive way to extend comfortable session times for training simulators, rehabilitation programs, telemedicine and entertainment. Beyond VR, the same principle could benefit passengers prone to seasickness or simulator sickness in aviation and driving simulation. The work also strengthens the scientific case that the vestibular system is a legitimate and tractable target for magnetic neuromodulation, a field that has matured from the serendipitous observation of MRI-induced dizziness into a quantitative discipline with dosing frameworks, personalized thresholds and objective neuroimaging endpoints. For the millions of would-be VR users who currently abandon headsets within minutes, that progression carries real promise: the sensory conflict behind their discomfort may soon be something engineers can measure, model and magnetically quiet.

Subject of Research: The dose-dependent regulatory effect of magnetic vestibular stimulation on visually induced motion sickness and resting-state EEG networks in virtual reality users

Article Title: Study on the regulatory effect of magnetic vestibular stimulation on visually induced motion sickness

Article References: Geng, Y., Li, X., Li, Y., Zhai, X., & Xu, G. (2026). Study on the regulatory effect of magnetic vestibular stimulation on visually induced motion sickness. Medical & Biological Engineering & Computing. https://doi.org/10.1007/s11517-026-03666-1

Image Credits: AI Generated

DOI: 10.1007/s11517-026-03666-1

Keywords: magnetic vestibular stimulation, visually induced motion sickness, virtual reality, EEG functional networks, Simulator Sickness Questionnaire, resting motor threshold, vestibular system, brain stimulation, cybersickness, neuromodulation, regulatory, effect

The research team, led by Yifan Li and colleagues at institutions working with Bayer-process red mud from Wenshan in Yunnan, China, set out to solve the two problems that have long prevented red mud from replacing ordinary Portland cement at scale. The first is its intrinsically low reactivity: red mud contains almost none of the highly reactive calcium silicate clinker minerals that give cement its binding power, so substituting it for cement simply dilutes the mixture and weakens the resulting concrete. The second is its high alkalinity, which interferes with the delicate chemistry of cement hydration. Previous remedies, such as thermal treatment, aggressive grinding, or full alkali activation, tend to be expensive, energy-hungry, or only partially effective.

Nano-silica offered a chemically elegant alternative. Because it consists almost entirely of amorphous silicon dioxide, the same chemical family as the calcium-silicate-hydrate gel that cements everything together, it can participate directly in the pozzolanic reaction, consuming calcium hydroxide released by cement hydration and converting it into additional binding gel. Its particles, averaging just 30 nanometres with a specific surface area of roughly 200 square metres per gram, also serve as thousands of microscopic nucleation platforms onto which early hydration products can precipitate. The question was whether these benefits would survive in the hostile, chemically complex environment that red mud creates.

To find out, the researchers prepared nine paste formulations, combining red mud replacement levels of 0, 10 and 20 percent with nano-silica dosages of 0, 1 and 3 percent, all at a fixed water-to-binder ratio of 0.3. The red mud, milled for 15 minutes in a planetary ball mill, was remarkably fine, with a median particle size of 3.06 micrometres, about a quarter that of the cement, and a specific surface area more than twice as high. Nano-silica was dispersed ultrasonically in the mixing water before blending. Specimens were cured at 20 degrees Celsius and 98 percent relative humidity and tested at 3, 7 and 28 days for compressive strength, with six replicates per mixture analysed statistically using two-way analysis of variance.

The results were unambiguous. Adding red mud alone reduced strength at every age, and the penalty grew worse as the replacement level rose: at 20 percent substitution, the 28-day strength fell from 59.3 megapascals for the plain paste to 48.9 megapascals. But nano-silica clawed much of that loss back. At 20 percent red mud, the 3 percent nano-silica mix reached 54.9 megapascals at 28 days, a statistically significant gain of 6 megapascals over the red-mud-only mix, with adjusted p-values below 0.001 at all three curing ages. More telling was the cement-normalised strength, which divides measured strength by the actual cement content to strip out the dilution effect. By this measure, the 20 percent red mud plus 3 percent nano-silica blend used its cement 34.58 percent more efficiently than plain paste at 3 days and 20.23 percent more efficiently at 28 days, evidence that the combination genuinely improves the chemistry rather than merely offsetting dilution.

The microscopic evidence explains why. X-ray diffraction and thermogravimetric analysis showed no new crystalline phases, but revealed steady consumption of calcium hydroxide in the nano-silica mixes, the fingerprint of ongoing pozzolanic reaction. The 3 percent dosage cut calcium hydroxide content by roughly 17 to 20 percent relative to the red-mud-only system at 3 and 28 days, while mass loss associated with hydrate gels rose 8.2 percent at early age, confirming accelerated product formation. Low-field nuclear magnetic resonance, which maps pore sizes through hydrogen relaxation times, showed that nano-silica shifted the pore network decisively toward harmless gel pores: at 3 days the harmless pore volume nearly doubled or more, and by 28 days the higher dosage produced the densest structure of all, as secondary gel generated by sustained pozzolanic reaction filled the voids left by early hydration.

Isothermal calorimetry and the Krstulovic-Dabic kinetic model added a dynamic picture. Red mud alone lowered the peak heat release and extended the induction period, symptoms of its dilution and low reactivity, and delayed the secondary aluminate-related exotherm to about 20 hours as reactive aluminium and silicon species dissolved slowly from the mud. Nano-silica reversed these trends, raising the nucleation-and-growth rate constant and the interfacial reaction constant while slightly lowering the diffusion constant, a signature of a matrix so dense that water and ions struggle to move through it. Backscattered electron microscopy with energy-dispersive spectroscopy confirmed the visual outcome: after 28 days, the nano-silica-modified blend showed a more continuous, homogeneous matrix, with residual iron- and titanium-rich red mud particles embedded in a Ca-Si-Al hydrate gel whose calcium-to-silicon ratio had drifted slightly downward, exactly as expected when reactive silica joins the reaction.

Environmental safety, often the Achilles heel of red mud reuse, also held up. Leaching tests on 28-day specimens following the Chinese HJ/T 299-2007 protocol showed arsenic, lead and nickel below detection limits in both mixes, chromium at just 3.8 micrograms per litre, and copper falling from 3.6 micrograms per litre to below detection once nano-silica was added. Every measured element sat comfortably beneath Class III groundwater quality limits, indicating that the mechanical upgrades did not come at the cost of mobilising hazardous elements from the waste.

Economics remain the honest caveat. Replacing 20 percent of cement with red mud cut the direct binder cost by 10.5 percent, to 285.29 yuan per tonne, even after including transport and milling expenses. But the 3 percent nano-silica addition drove the total to 1701.79 yuan per tonne, with the nanomaterial alone accounting for roughly 1404 yuan, so the additive only makes sense where its strength gains are genuinely needed or where nano-silica prices fall with scale. The authors also note limitations: workability and setting behaviour were not measured, phase analysis remained qualitative, and long-term durability tests such as freeze-thaw and sulfate exposure are still to come. Even so, the study delivers a compelling proof of concept that a cheap industrial nuisance and a well-chosen nanomaterial can team up to make cement stronger, denser and cleaner, turning one of the world’s largest waste streams into part of the solution rather than part of the problem.

Subject of Research: Nano-silica modification of red mud-cement composite binders to improve mechanical properties and hydration kinetics

Article Title: Effect of nano-silica on the mechanical properties and hydration kinetics of red mud-cement based composite cementitious materials

Article References: Li, Y., Guo, R., Pan, T., Zhu, Y., Tang, X., Fu, C., & Li, Y. (2026). Effect of nano-silica on the mechanical properties and hydration kinetics of red mud-cement based composite cementitious materials. Case Studies in Construction Materials, 25, Article e06502. https://doi.org/10.1016/j.cscm.2026.e06502

Image Credits: AI Generated

DOI: 10.1016/j.cscm.2026.e06502

Keywords: red mud, nano-silica, cement, hydration kinetics, compressive strength, pore structure, pozzolanic reaction, solid waste recycling, supplementary cementitious materials, sustainable construction, Effect, mechanical

Soil salinity is a growing constraint in coastal regions and irrigated farmland. When soluble salts accumulate around roots, they initially create osmotic stress, making it harder for plants to extract water even when the soil appears moist. As salt ions enter tissues, they can cause ionic toxicity, disrupt membranes and enzymes, trigger oxidative stress and restrict nutrient acquisition. Young seedlings are particularly vulnerable because their root systems and physiological defences are still developing. Mustard is an important oilseed crop in India, but the CS61 variety, like many crops, can experience reduced productivity when exposed to excessive salt. The researchers turned to mangroves because their rhizospheres are shaped by periodic tidal flooding, high salinity, oxygen-poor sediments and fluctuating chemical conditions. Microorganisms that persist there must maintain cellular function under stress, making the mangrove root zone a promising reservoir of bacteria with salt-tolerance traits. The central idea is not that these microbes remove all salt from soil, but that they can help plants tolerate its effects by changing the biological conditions around the root.

The team collected rhizosphere soil from 11 mangrove sites extending from Koparkhairane to Belapur in Navi Mumbai, Maharashtra. From those samples, they recovered 1,263 bacterial isolates. The initial screening narrowed the collection to organisms able to grow with 5 percent sodium chloride, leaving 168 moderately salt-tolerant isolates. At 10 percent sodium chloride, 97 isolates still grew on solid medium. After repeated purification, 36 were confirmed as pure cultures, and a preliminary blood-agar test excluded isolates showing alpha- or beta-hemolysis, which can indicate potentially undesirable biological activity. Seventeen non-hemolytic isolates remained for detailed testing. In liquid medium, all 17 grew strongly at 2, 4 and 6 percent sodium chloride. At higher concentrations, growth varied, and only some strains maintained moderate growth at 10 percent. None grew at 12, 14 or 16 percent in the tested broth conditions. That decline provided a useful physiological boundary: the bacteria were highly salt tolerant compared with ordinary soil isolates, but they were not immune to extreme osmotic pressure.

The surviving isolates were then examined for functions associated with plant growth promotion. These tests looked for traits that could influence nutrient availability, root development or stress responses. Nitrogen-fixation and phosphate-solubilization activity appeared in 82.4 percent of the isolates, potentially helping convert nutrients into forms plants can access. Every isolate produced indole-3-acetic acid, or IAA, a plant hormone involved in cell expansion and the formation of lateral roots, although production levels differed. Five isolates showed strong IAA activity. All isolates also produced ammonia and biosurfactants, while 64.7 percent produced gibberellin-like compounds and 94.1 percent showed protease activity. Cellulose degradation occurred in 58.8 percent, pectin degradation in 35.3 percent and starch hydrolysis in 23.5 percent. Exopolysaccharide production was less common, detected in 11.8 percent of the isolates. Such secreted polymers can sometimes help bacteria and their plant hosts manage water stress by altering the immediate soil microenvironment, although the present study did not establish the contribution of each mechanism inside living plants.

The researchers also tested whether the bacteria could inhibit Aspergillus niger, a fungus used in the study’s laboratory assay as an indicator of antifungal potential. Sixteen of the 17 isolates produced detectable inhibition zones. Three strains stood out because their activity was consistent and pronounced: BJ2, DJ12 and J4. Genetic identification using nearly complete 16S rRNA gene sequences assigned BJ2 to Micrococcus luteus, while DJ12 and J4 were identified as Microbacterium barkeri. Their sequences were deposited in GenBank under accession numbers PX974661, PX974662 and PX974663, respectively. The three strains also showed no inhibitory interaction with one another in a cross-streak compatibility test, an important preliminary condition for combining them. The proposed consortium therefore brought together a Micrococcus strain and two Microbacterium strains with overlapping but not identical functional profiles. The authors note that M. barkeri has been less explored as a plant-growth-promoting bacterium, so its apparent activity in this work warrants additional investigation rather than immediate agricultural deployment.

In the first plant test, surface-sterilized Mustard CS61 seeds were treated with each bacterial strain separately, with an equal-volume mixture of all three, or with sterile water as a control. The seeds were placed on filter paper moistened with 0.85 percent sodium chloride and observed under controlled laboratory conditions. Every treatment reached 100 percent germination within two days, showing that the applied salt concentration did not prevent germination itself. The differences appeared in the seedlings that followed. Relative to the salt-stressed control, BJ2 increased root length by 98.8 percent and DJ12 by 96.4 percent, whereas J4 produced a much smaller 0.9 percent increase. The consortium generated the largest root response, an increase of 240.7 percent. Shoot length rose by 49.7 percent with BJ2, 23.5 percent with DJ12 and 49.4 percent with J4; the consortium increased it by 60.3 percent. Measures combining seedling size and germination, including the seedling vigour index, also improved most strongly with the combined inoculum. The statistical tests indicated significant treatment effects on root and shoot length.

The pot experiment provided a second test under controlled conditions. Mustard seeds were inoculated with the same individual strains or consortium and planted in soil exposed to salinity equivalent to 1 percent sodium chloride. An untreated control and an autoclaved-soil treatment were included. All treatments again reached 100 percent germination within two days, but bacterial inoculation significantly changed subsequent growth. The untreated plants had an average root length of 35.43 millimetres. DJ12 produced the longest roots, averaging 58.37 millimetres, followed by BJ2 at 57.43 millimetres, J4 at 56.57 millimetres and the consortium at 55.60 millimetres. For shoots, J4 performed best at 107.9 millimetres, followed by the consortium at 105.93 millimetres, BJ2 at 104.3 millimetres and DJ12 at 98.33 millimetres, compared with 96.8 millimetres in the control. The autoclaved treatment produced shorter roots and shoots, suggesting that biologically active cells or their ongoing products, rather than sterilized soil alone, were important to the observed response. The study used triplicate treatments, and analysis of variance with Dunnett’s test found highly significant effects for the principal growth measures.

Leaf chemistry and soil measurements added further clues, although they do not yet demonstrate how the inoculants would perform in a farm field. Total chlorophyll reached 0.365 milligrams per gram of fresh tissue in J4-treated plants, compared with 0.131 milligrams per gram in the control and 0.109 milligrams per gram in autoclaved soil. Higher chlorophyll levels may indicate better maintenance of photosynthetic machinery under salt stress, but the experiment did not directly measure photosynthetic rates or yield. After the pot trial, consortium-treated soil contained more measured carbon and nitrogen than control soil: carbon rose from 0.92 to 1.39 milligrams per litre, while nitrogen increased from 2,199.26 to 2,343.17 milligrams per kilogram. The soil pH increased from 6.85 to 7.55, and electrical conductivity rose from 851 to 948 microsiemens per centimetre. These changes are consistent with microbial effects on nutrient cycling, but their long-term significance remains uncertain. The authors propose metagenomic studies to investigate uncultured mangrove microbes and identify genes associated with salt tolerance and plant growth promotion. Field trials will also be needed to test persistence, colonization, compatibility with native soil communities, crop yield and biosafety before the consortium can be considered a reliable agricultural product.

The study’s strongest implication is methodological as well as agricultural: it demonstrates a pipeline for finding stress-adapted bacteria in an ecosystem that is rarely treated as a source of crop inoculants. Screening began with a large isolate collection and combined salt tolerance, plant-growth traits, safety-related hemolysis testing, molecular identification and compatibility testing. That sequence helps distinguish organisms that merely survive salt from candidates with a plausible capacity to interact beneficially with plants. The reported IAA production and cellulase activity are useful indicators, but they are laboratory traits; they do not by themselves prove that the compounds were produced at effective concentrations in the mustard rhizosphere.

The results should therefore be viewed as proof of potential rather than evidence of a ready-to-use biofertilizer. The experiments were conducted under controlled saline conditions, and the measured outcomes focused mainly on germination and early vegetative growth. Longer trials are needed to determine whether improved roots and shoots persist through flowering and seed production, particularly because salt levels, soil texture, temperature and native microbial communities vary substantially in agricultural fields. Future work should also verify strain identity with more discriminating genomic methods, quantify root colonization, test inoculant shelf life and examine whether the consortium remains stable during storage and after application. Comparing treated and untreated plants across several salinity regimes would help separate general growth promotion from genuinely salt-specific protection. Such validation is essential before introducing mangrove-derived strains beyond experimental settings.

Subject of Research: Mangrove-derived plant growth-promoting bacteria improving mustard growth under salinity stress

Article Title: Effect of plant growth promoting rhizobacteria on the growth promotion of Mustard CS61 (Brassica juncea)

Article References: Bhat, M. R., Auti, M., & Poojary, P. (2026). Effect of plant growth promoting rhizobacteria on the growth promotion of Mustard CS61 (Brassica juncea). Discover Biotechnology, 3(1), Article 12. https://doi.org/10.1007/s44340-026-00059-w

Image Credits: AI Generated

DOI: 10.1007/s44340-026-00059-w

Keywords: plant growth-promoting rhizobacteria, mustard, Brassica juncea, salinity stress, mangrove microbiology, Micrococcus luteus, Microbacterium barkeri, bioinoculants, Effect, plant, growth, promoting