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    • Article
    • Open Access

    Transition metal sulfides and oxides are attractive for supercapacitor electrodes due to rich redox sites and high theoretical capacitances. Yet single-phase materials suffer from poor structural stability and slow charge transfer, restricting practical applications. Herein, a facile microwave route is developed to prepare Cu2S/CoO composite electrodes. Experimental results demonstrate that the heterogeneous interface between Cu2S and CoO induces a prominent synergistic effect, which greatly boosts the redox activity of the electrode. The optimized Cu2S/CoO composite exhibits a specific capacitance of 2898 F g−1 at 1 A g−1, and maintains 84.1% of its initial capacitance after 30,000 continuous cycles, revealing remarkable cycling durability. The asymmetric supercapacitor fabricated with the Cu2S/CoO negative electrode delivers an energy density of 186.45 Wh kg−1 at a power density of 800.02 W kg−1, and this performance outperforms most recently reported analogous electrode systems. This research offers a practical route for the fast fabrication of high-performance bimetallic composite electrodes through microwave treatment, and supplies useful references for the structural engineering and performance optimization of advanced electrochemical energy storage materials.

    Molecules

    16 October 2026

    • Article
    • Open Access

    Digital transformation is a strategic priority across care-intensive service sectors, yet many organisations struggle to realise its intended benefits. Existing research often examines technological, organisational, and environmental barriers separately, offering limited insight into their interconnections within organisational systems. Drawing on Systems Theory and Sociotechnical Systems (STS) Theory, this study investigates digital transformation among small and medium providers within Australia’s National Disability Insurance Scheme (NDIS). Using an interpretive qualitative design, semi-structured interviews were conducted with 15 participants from 15 distinct NDIS provider organisations in Sydney, Australia, followed by reflexive thematic analysis and systems-oriented interpretation. Participants described recurring associations among technological misalignment, fragmented software, adaptive workarounds, increased administrative demands, and constraints on organisational capacity for digital improvement, with regulatory and resource pressures interacting with these technological and organisational conditions. Building on these cross-sectional patterns, this study develops Recursive Capability Constriction (RCC), a systems-based conceptual framework that proposes how technological misalignment, compensatory adaptation, administrative expansion, and constrained organisational capability for digital improvement may become interconnected through reinforcing relationships. Rather than representing an inevitable or empirically established causal sequence, RCC provides a conditional explanation of how local adaptations may become associated with constraints on subsequent digital improvement. By shifting attention from isolated implementation barriers to interconnected sociotechnical relationships, RCC extends digital transformation research and provides practical guidance for managing digital change in regulated care environments.

    Systems

    16 October 2026

    • Article
    • Open Access

    Efficient generation of tumor-specific cytotoxic T lymphocytes (CTLs) remains challenging. Although mRNA-based approaches enable the delivery and expression of diverse tumor-specific antigens, unmodified mRNA can trigger innate immune responses that suppress translation. Here, we investigated whether 1-methyl-pseudouridine (m1Ψ)-modified mRNA enhances antigen expression in human dendritic cells (DCs) and promotes the induction of antigen-specific CTLs, using survivin and MART-1 as model tumor-associated antigens. Remarkably, m1Ψ modification increased protein production in DCs by up to 20-fold compared with unmodified mRNA. DCs transfected with m1Ψ-modified mRNAs efficiently primed survivin- and MART-1-specific CD8+ T cells from autologous peripheral blood mononuclear cells of healthy donors, as demonstrated by HLA class I peptide–MHC dextramer staining. Expanded CTL lines exhibited potent effector functions, including IFN-γ production, CD107a mobilization, and robust cytotoxicity against peptide-pulsed T2 cells and tumor cell lines expressing survivin or MART-1. Translation of the engineered mRNA variants in human HeLa cells and DCs is strongly dependent on the poly(A) tail. Together, these findings demonstrate that m1Ψ modification substantially enhances antigen expression and supports the efficient generation of functional, antigen-specific CTLs, providing a promising platform for next-generation mRNA-based cancer vaccines and adoptive T-cell therapies.

    Int. J. Mol. Sci.

    16 October 2026

    • Review
    • Open Access

    Prostaglandin E2 (PGE2) signalling influences amyloid-β (Aβ) processing, myeloid function, and neuronal injury in Alzheimer’s disease (AD). Although EP2 and EP4 share Gs–cyclic adenosine monophosphate (cAMP) signalling, their cellular effects differ. This review integrates genetic, pharmacological, ageing, and AD-model evidence to assess receptor-selective targeting. EP2 deletion enhances myeloid Aβ handling and reduces microglia-mediated neuronal injury in experimental systems, providing a rationale for selective EP2 inhibition. In aged mice, PGE2–EP2 signalling redirects glucose towards glycogen storage and restricts myeloid mitochondrial respiration; benefits from a predominantly peripheral antagonist suggest that some age-related outcomes may improve without high brain exposure. Chronic antagonist studies in AD models, however, show variable effects on inflammation, amyloid burden, and behaviour. EP4 exhibits contrasting cell-dependent actions: activation supports microglial Aβ uptake and inflammatory control, whereas signalling in some amyloid precursor protein (APP)-expressing cells promotes APP internalisation and Aβ production. Human AD evidence remains mainly tissue-based; EP2 antagonist testing has involved healthy volunteers, not patients with AD. These findings indicate that receptor selectivity alone is insufficient to predict therapeutic outcomes. Further studies should combine cell-specific receptor manipulation, measurements of central and peripheral exposure, and separate assessments of Aβ production, clearance, tissue injury, and functional outcomes.

    Int. J. Mol. Sci.

    16 October 2026

    • Systematic Review
    • Open Access

    Ultraviolet radiation is increasingly used as a controllable physical technology for crop disease management, but inconsistencies in parameter reporting, the validation scale, and engineering evidence hinder cross-study comparisons and practical translation. Following the PRISMA 2020 statement, this systematic review searched the Web of Science Core Collection and IEEE Xplore, screened eligible studies, and conducted full-text data extraction and structured coding. A total of 80 studies were evaluated across four domains: UV treatment parameter reporting, highest validation level, translational maturity, and engineering characteristics of application equipment. The treatment frequency or number of applications and wavelength were explicitly reported in 83.8% and 76.3% of studies, respectively, whereas irradiance and post-treatment light or dark conditions were reported in only 36.3% and 35.0%. In 57.5% of studies, the highest validation level remained limited to in vitro pathogen assays, detached-material experiments, or controlled-environment whole-plant experiments; low and low-medium translational maturity together accounted for 62.5%. Among the 11 equipment-related studies included in this review, the operating speed and target-surface dose calibration were reported more frequently than within-canopy dose uniformity, shading effects, and operational control. UV-based crop disease control is progressing toward field and equipment applications, but incomplete parameter reporting, discontinuities in the production-scale evidence chain, and unstable dose delivery still constrain reproducibility and scale-up. Future research should establish minimum reporting standards, strengthen multi-site and multi-season validation, translate biologically effective doses into equipment operating parameters, and develop closed-loop control based on actual target-surface dose monitoring.

    Agriculture

    16 October 2026

    • Article
    • Open Access

    The IFNAR2 gene encodes an essential component of the type I interferon receptor, which is essential for antiviral defense. It has been proven that the severity of COVID-19 may be influenced by the genetic variants in IFNAR2; however, the results are inconclusive in the African cohorts. Thus, in this study, we investigate the association between three IFNAR2 SNPs and the critical form of COVID-19 in the Tunisian population. A total of 413 COVID-19 patients classified as hospitalized with critical illness (ICU) (n = 46) and non-hospitalized (n = 367) are included. Genotyping of three IFNAR2 polymorphisms (rs1051393, rs2236757, rs9984273) was performed using Taq Man RT-PCR assays. rs2236757 (OR = 0.31, 95% CI: 0.16–0.60), p = 4 × 10−4) and rs9984273 (OR = 0.41, 95% CI: 0.22–0.76, p = 0.0055) were associated with COVID-19 severity with a potential protective effect. However, rs1051393 did not show a significant association with disease severity. Additionally, exploratory haplotype analysis suggested a possible protective association for the TAC haplotype (OR = 0.11, 95% CI: 0.02–0.86, p = 0.036), based on a very small number of carriers and not significant after correction for multiple testing. The GAC haplotype, absent from ICU patients, yielded a continuity-corrected OR of 0.03 (95% CI [0.002–0.53]); this estimate rests on a zero cell and is hypothesis-generating only. These preliminary findings, obtained from a single-center cohort with a limited number of critically ill patients, warrant replication in larger, independent, and multicentric populations.

    Viruses

    16 October 2026

    • Article
    • Open Access

    Bacillus subtilis is an extensively characterized Gram-positive bacterium with broad applications in agriculture, biotechnology, and biocontrol. Strain SNUY1, known for its antifungal properties and use as an edible coating, has been completely sequenced and deposited in NCBI (accession: CP199918), making it an important model for genomic and functional characterization. Here, we present the MAYA pipeline, a fully automated, rule-based Snakemake workflow that integrates eighteen bioinformatic tools into a single end-to-end framework. MAYA accepts either raw Illumina paired-end FASTQ reads or pre-assembled FASTA sequences, utilizing per-rule Conda environment isolation to ensure strict version control and reproducibility across all constituent tools from quality control and assembly through functional annotation, plasmid typing, and detection of biosynthetic and antimicrobial resistance gene clusters. To benchmark pipeline accuracy across both input modes, MAYA was evaluated using Bacillus subtilis subsp. subtilis str. 168(AL009126 OZ025638). The FASTA assembly yielded a circularized 4,215,606 bp chromosome (N50: 4.21 Mb, 43.51% GC) with 98.28% CheckM completeness and 100.0% BUSCO ortholog recovery. Prokka annotation predicted 4214 CDSs (86 tRNAs, 30 rRNAs) in FASTA mode compared to 4313 CDSs (106 tRNAs, 25 rRNAs) in FASTQ mode, reflecting expected read fragmentation in unassembled data. DIAMOND mapping against SwissProt yielded 4135 hits (99.90% mean identity) in FASTA mode and 4170 hits (99.75% mean identity) in FASTQ mode. Both modes identified identical ST1 Multilocus Sequence Typing (MLST) profiles and six core AMR determinants (mphK, vmlR, rphC, aadK, satA_Bsub, and tet(L)), while antiSMASH detected 15 biosynthetic gene cluster (BGC) regions (22 protoclusters) in FASTA mode versus 16 regions (23 protoclusters) in FASTQ mode. MOB-suite resolved two non-mobilizable plasmids in the FASTQ assembly (bioproject: PRJNA76): pAC670 and a novel 1666 bp plasmid. Furthermore, nucleotide BLASTN analysis resolved a 76-CDS discrepancy between published NCBI annotations and MAYA/Prokka, demonstrating 95.5% (4081/4272) stringent sequence match and confirming that differences stem from gene-model predictions rather than omitted loci. To demonstrate the FASTA-mode application workflow, the complete SNUY1 (NZ_CP199918) genome assembly was processed through MAYA, yielding a single, contiguous chromosome of 4,196,931 base pairs with a GC content of 43.69% (98.28% CheckM, 100% BUSCO completeness). Annotation identified 4196 coding sequences, while antiSMASH profiling revealed 13 candidate biosynthetic gene cluster (BGC) regions comprising 20 protoclusters (including NRPS, lanthipeptides, terpenes, and sactipeptides), aligning with the strain’s biocontrol capabilities. AMR profiling identified six chromosomally encoded resistance genes (mphK, vmlR, rphC, aadK, satA_Bsub, and tet(L)). In silico mobility analysis via MOB-suite demonstrated that these sequences lack functional conjugation machinery and are classified as non-mobilizable. Executing in 3–4 h on an Intel Xeon server (128 GB RAM, 29 CPU cores), MAYA delivers an efficient, audit-ready framework for end-to-end bacterial genomic profiling.

    Int. J. Mol. Sci.

    16 October 2026

    • Article
    • Open Access

    Background: Portal venous phase (PVP) contrast-enhanced CT is a cornerstone for response assessment in early-phase oncology trials, yet contrast-enhancement phase timing remains insufficiently monitored across sites. We assessed PVP timing using a validated artificial intelligence (AI) quality control tool (CECT-QC). Methods: In this retrospective multicenter study, 402 CT examinations from 402 patients enrolled in phase I oncology trials across three European institutions were analyzed using CECT-QC, which quantifies aortic and portal venous enhancement to classify contrast-enhancement phase. The primary analysis included 335 standard CT examinations. Optimal PVP classification was compared (i) across institutions, (ii) before vs. after French regulatory changes impacting contrast delivery, and (iii) across scanner technologies (photon-counting CT [PCCT] vs. standard CT). Results: Among the 335 standard CT examinations included in the primary analysis, 53.1% (178/335) were classified by CECT-QC as optimal PVP. Optimal PVP rates were 39.0% (32/82) at Institution A, 56.9% (87/153) at Institution B, and 59.0% (59/100) at Institution C, with a significant adjusted institutional association (p = 0.039). No significant temporal association was observed before versus after the legislative change (p = 0.716). At Institution A, standard CT was associated with higher odds of optimal PVP classification than PCCT (OR 2.24, 95% CI 1.07–4.68; p = 0.031), while PCCT showed higher aortic and portal venous attenuation (both p < 0.001). Conclusions: Approximately half of standard CT examinations in phase I oncology trials were classified as optimal PVP. Classification varied significantly across institutions and by scanner technology, whereas no significant temporal association was observed before versus after the legislative change. These findings support continued quality-control monitoring, protocol harmonization, and adaptation of classification tools to emerging CT platforms.

    Diagnostics

    16 October 2026

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  • Article
  • Open Access

I argue that the emerging sciences of synthetic morphology and diverse intelligence suggest non-physicalist models of mind and show how they can be empirically investigated. Whence the anatomical, physiological, molecular-biological, and behavioral properties of engineered new beings that have never before existed, and do not have a history of selection? Understanding, predicting, and guiding new forms of life and mind requires characterizing a structured latent space of patterns. Developmental, synthetic, and behavioral biology should take seriously, and exploit, the kinds of non-physicalist ideas that are already a staple of Platonist mathematics. I propose the following hypotheses. (1) Patterns in this space span a highly variable degree of agency, comprising a spectrum ranging from static truths studied by mathematicians to active ones studied by behavioral scientists (i.e., some patterns on the same spectrum as mathematical truths are kinds of minds). (2) The relationship between mind and body is the same as the relationship between causally instructive mathematical facts and physics. (3) Living beings have no monopoly on the “free lunches” provided by the ingression of these patterns into the physical world. While traditional computationalist views of living and cognitive systems are insufficient, my framework erases artificial distinctions between organisms and machines, framing all physical constructs (natural or engineered) as being, to various degrees, in-formed by patterns from the latent space. I sketch a research program, already begun, inspired by these ideas. Such frameworks, while contradicting long-held assumptions of both mechanists and organicists, could have many implications for evolutionary biology, regenerative medicine, AI, and the ethics of synthbiosis with the forthcoming immense diversity of morally important beings.

Philosophies

9 September 2026

74,203 Views
Bodies and minds self-assemble from single cells as a process of alignment and autopoiesis. (A) Most complex biological forms begin as one cell—a fertilized oocyte, commonly thought to be well-described by the laws of physics and chemistry. (B) A gradual, slow process of developmental morphogenesis results in the final form of the organism, which may have complex structure and a mind which may not believe it is a “machine”. Our transformation from a chemical soup into an active embodied mind is continuous but heterogeneous: (C) while we commonly think of ourselves as a unified intelligence with a “centralized” brain, the fact is that even the pineal gland, of which there is only one in the brain, is made of cells (C′) and those cells in turn are made of myriad other active components (C″)—we are a collective intelligence at all scales. (D) The creation of an “individual” out of an excitable medium such as an embryonic blastoderm with hundreds of thousands of cells is a dynamic process that is not hardwired: scratches made in that blastoderm would result in independent self-organization in each island, resulting in multiple embryos forming. This reveals the potentiality for some non-pre-determined number of minds to arise out of the same substrate. Images in (A,B,D) courtesy of Jeremy Guay of Peregrine Creative, used previously in [29]. Image (B) used with permission from [30]. Image in (C′) courtesy of Jose Calvo, Science Photo Library. Image in (C″) courtesy of Evan Ingersoll and Gaël McGill. Image (D) used with permission from [31].
  • Review
  • Open Access

Background: Chlorine dioxide (ClO2), formulated as an aqueous solution (CDS), has been proposed as a therapeutic agent, yet its classification among oxidizing compounds is frequently confounded with chemically distinct species—sodium chlorite (NaClO2) and sodium hypochlorite (NaOCl). Objective: This study aimed to synthesize the physicochemical, mechanistic and cellular basis of ClO2 action and to delineate the distinctions between ClO2 and related oxidants, with explicit separation of established data from hypothesized data. Methods: The methodology includes a narrative synthesis of electrochemical data, primary toxicological and clinical literature (PubMed) and the redox-biology literature on low-dose oxidant signaling. Results: ClO2 is a neutral free radical that acts via one-electron transfer (E°′ = +0.95 V vs. SHE for the half-reaction ClO2 + e− → ClO2−, essentially pH-independent over pH 4–8, pH-independent) without chlorination. Its antimicrobial action is attributable to oxidation of thiol-dependent enzymes and membrane constituents and to the inhibition of bacterial respiratory metabolism; host-cell sparing is consistent with differential glutathione-dependent buffering. Controlled human ingestion studies at low concentrations report a favorable short-term safety profile; conversely, the principal metabolite (chlorite) is associated with documented developmental toxicity in animals and regulatory caution by EPA/WHO. Low-dose ClO2 exposure is hypothesized—but not yet directly demonstrated—to elicit dose-dependent adaptive redox responses and redox-regulatory modulation. Conclusions: The one-electron, non-chlorinating chemistry of ClO2 provides a coherent mechanistic framework. The translation of this framework into clinical application requires prospective trials and direct mechanistic measurement, ideally conducted by independent investigators. The following mechanisms are hypothesized and have not yet been directly demonstrated in vivo: modulation of oxidative phosphorylation, mitochondrial oxygenation, and associated redox-regulatory signaling. Reported antimicrobial efficacy typically occurs in the low-ppm range (0.1–5 ppm), whereas adverse effects on mammalian cells in the reviewed literature are reported at concentrations at least one order of magnitude higher; direct head-to-head cytotoxicity comparisons remain scarce and are identified as a priority for future work. This differential thiol buffering—in particular, the higher glutathione content of many mammalian cells relative to many pathogens—has been proposed as a contributing basis for host-cell sparing; direct quantitative confirmation in vivo is not yet available. Bacterial species possess their own thiol-based defense systems (e.g., mycothiol in actinomycetes, bacillithiol in Firmicutes), and the interplay between ClO2 and these systems requires further investigation.

Biophysica

21 September 2026

11,581 Views
Mechanistic overview. ClO2 acts via one-electron oxidation of microbial targets (thiol oxidation, envelope and nucleic acid damage, respiratory inhibition); host cells are spared through glutathione-dependent redox buffering. The proposed low-dose hormetic response is a hypothesis requiring direct experimental confirmation, as discussed in Section 4.2.
  • Article
  • Open Access

Nanoconfinement-Enhanced CO2 Retention in Fenamate-Loaded Silica Aerogels

  • Konstantin Belov,
  • Maria Ikim and
  • Ilya Khodov
  • + 6 authors

The interaction between carbon dioxide and molecularly confined pharmaceutical compounds can result in CO2 retention that exceeds that achieved through conventional physical adsorption. This study investigates CO2 retention following sorption in hydrophilic and hydrophobic silica aerogels containing the fenamates mefenamic acid and flufenamic acid. The Thermal stability of the retained CO2 was characterized using temperature-programmed oxidation and temperature-programmed desorption measurements. Concurrently, single-point nitrogen adsorption measurements monitored relative changes in the apparent accessible surface area of the porous matrix. Untreated silica aerogels did not exhibit a significant CO2 desorption peak at elevated temperatures. In contrast, all composites containing fenamates exhibited an additional high-temperature desorption step beginning at approximately 225 °C, indicating enhanced CO2 retention after sorption once the external CO2 layer was removed. This characteristic persisted following preliminary thermal treatment, suggesting it is not solely attributable to residual volatile substances. Surface-area measurements indicated minimal changes in the original aerogels after the CO2 cycle, whereas composites with flufenamic acid demonstrated more pronounced alterations. Considering previous nuclear magnetic resonance, spectroscopic, and computational studies, these findings suggest a combined effect of nanoconfinement, surface-dependent interfacial phenomena, and specific interactions involving the fenamate-containing phase. Reversible chemical interactions may contribute to the observed retention, although the current measurements do not allow for quantitative separation of their effects from those of physical confinement.

Molecules

14 September 2026

12,305 Views
TPO (black) and TPD (red) curves for AG-H-Phil (a) and AG-H-Phob (b) recorded over the temperature range from 30 °C to 500 °C.
  • Article
  • Open Access

Digital Facial Approximation of Jebel Irhoud Composite Skull (~315,000 BP)

  • Cicero Moraes,
  • Elena Varotto and
  • Johari Yap Abdullah
  • + 3 authors

The archeological site of Jebel Irhoud, Morocco, houses the oldest fossils attributed to Homo sapiens, dated to approximately 315,000 years before present (BP). This study presents a forensic facial approximation based on data from a three-dimensional composite skull derived from Layer 7 of the site, with structural predominance of the Irhoud 1 fossil. The methodology employed open-source software tools, combining anatomical projections and the constrained anatomical deformation technique. Endocast segmentation yielded a volume of 1364 mL, a result fully compatible with measurements and segmentations obtained in previous studies directly from the fossil, while also aligning with the variation observed in modern populations. Two sets of images were produced: an objective approximation in grayscale, focused on osteological correspondence, and a colored artistic version featuring skin pigmentation and facial hair for scientific communication. The results reinforce the feasibility and reproducibility of open-access methodologies applied to paleoanthropology, offering an anatomically coherent representation of this Middle Pleistocene hominin.

Heritage

13 September 2026

10,812 Views
(A) Photogrammetry performed from video (credit: Philipp Gunz, MPI EVA Leipzig, License: CC-BY-SA 2.0). (B) One of the scale adjustments based on images of the findings. (C) Adjustment of the virtual donor to the endocranial structure (credit: Philipp Gunz, MPI EVA Leipzig, License: CC-BY-SA 2.0). (D) Segmentation of the endocranium from the anatomical deformation of the virtual donor. References available in [3].

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Editor's Choice Articles

  • Review
  • Open Access

Cistus creticus, a perennial shrub native to the Mediterranean region, has attracted considerable scientific attention due to its rich phytochemical profile and associated health-promoting properties. This review provides a comprehensive analysis of the antioxidant activity of C. creticus, examining the various extraction methods that influence the bioavailability and efficacy of its active compounds. The plant’s antioxidant properties are primarily attributed to its high content of flavonoids, phenolic acids, and other bioactive constituents, which play a key role in mitigating oxidative stress and reducing the risk of chronic diseases. The review further discusses the effectiveness of different extraction techniques—mainly maceration and ultrasound-assisted extraction—in maximizing the yield and potency of antioxidants from the plant. By synthesizing current research findings, this review aims to highlight the therapeutic potential of C. creticus and provide a basis for future studies on its application in nutraceuticals and functional foods.

AppliedChem

2 October 2026

Conceptual overview of extraction methods, polyphenolic classes, biological activities, and food applications of Cistus creticus extracts.
  • Review
  • Open Access

Wearable and attachable healthcare devices provide valuable insights across a broad range of applications, from health monitoring and disease diagnosis to the assessment of daily human activities. For these devices, both the formation of high-performance electrodes and mechanical, electrical, and physiological stability at human-device interfaces are critically important. Conductive gels, which combine deformable polymer networks with electrical conductivity, show considerable potential as functional materials for such applications. However, existing reviews have often considered material properties, interfacial behavior, and device reliability separately. This review examines hydrogels, ionogels, and organogels by linking material design, stimulus- and analyte-responsive sensing, biological and device interfaces, and healthcare applications. This integrated perspective emphasizes evaluating conductive gels within complete healthcare devices, where material properties, biological interfaces, and device integration jointly determine practical performance. Such evaluation needs to address signal quality and the stability of the assembled system during deformation, environmental exposure, and prolonged use. Future progress will require reproducible device fabrication and standardized validation tailored to the intended application, with systematic assessment of long-term biosafety and alignment with relevant regulatory requirements. Integration with flexible electronics, intelligent data processing, and feedback control may further enable reliable and responsive healthcare platforms.

Gels

30 September 2026

Schematic overview of conductive gels for wearable and attachable healthcare devices, illustrating the material platforms, sensing mechanisms, interfaces, and representative applications. The graphical icons in the schematics were generated using ChatGPT (GPT-5.6, OpenAI), while the overall organization and annotations were developed by the authors.
  • Article
  • Open Access

We have studied the typomorphic features of native gold and magnetite of black and gray heavy mineral concentrates from the placers of the Rangkul region (Eastern Pamirs, Tajikistan), stored in the collections of the Vernadsky Museum (Moscow). Optical microscopy, scanning electron microscopy with SEM-EDS microanalysis, and high-resolution X-ray computed tomography (micro-CT) were used to study these minerals. It was revealed that the gold grains are flattened, semi- or medium-rolled, and they correspond to small and medium size fraction. Native gold from the black concentrate is characterized by a heterogeneous structure and variations in the fineness from 900‰ in the center to 1000‰ in the marginal parts. On the surface, it contains goethite and a mixture of Fe–Ca–Mg–Si–Al–O phases. In two gold grains from the gray concentrate with a fineness of 918–987‰ and 923–1000‰, mineral microinclusions were detected: one contains glaucodot with impurities of Fe and Ni, galena, kaolinite, and goethite, and the other contains muscovite, plagioclase, Ni-pyrrhotite (Ni 0.3–0.5 wt.%), and goethite. The third gold grain of the gray concentrate is characterized by a lower fineness ranging from 746‰ (in the center) to 914‰ (in the margins). Secondary minerals, goethite and Fe–Si–Al–O phases, are present in the inner zone of this gold grain. Magnetite is represented by octahedral crystals of 100–200 microns in size. They are slightly rounded. Their surface is often covered with goethite and clay minerals, rarely Au-Ag particles. Inclusions of monazite-(Ce), xenotime-(Y), ilmenite, rutile, chloritoid, garnet (almandine), tourmaline (schorl), apatite, quartz, and barite were found in the magnetite crystals. Significant amounts of magnetite in the placer concentrates containing native gold may indicate common and (or) different primary sources of these minerals. Orogenic gold deposits in the shear zones with a veined–disseminated type of ores and gold–sulfide–magnetite skarns or gold–magnetite (iron ore) deposits are predicted as possible common potential sources of native gold and magnetite in the Rangkul area. The presence of carbonate–terrigenous rocks and magmatic rocks (diorites) in this area together with the occurrence of ore bodies in dikes suggest the skarn type of primary source of both gold and magnetite. The typomorphic features of magnetite and the widespread occurrence of metamorphic schists in the Rangkul ore district indicate that these ore-bearing rocks could serve as an additional source of these minerals in heavy concentrates. The obtained results can be useful for planning exploration and mining activities of gold deposits in the Rangkul area and adjacent territories.

Minerals

29 September 2026

Schematic tectonic map of the Southeastern Pamirs with gold-placer ore districts (according to [48] with changes and supplements). 1—Pamir-Kunlun foredeep; 2—Northern Pamirs zone with subzones I—Kalai-Khumb-Sauksai, II—Kurgovatskaya, III—Karakulskaya, and IV—Darvaz-Sarykolskaya; 3—Central Pamir zone with subzones V—Vanch-Yazgulemskaya, VI—Sarez-Pshartskaya, and VII—Muzkol-Rangkul; 4—zone of the Southeastern Pamirs with subzones VIII—Rushan, IX—Bazardara, X—Gurumda, XI—Istyk, XII—Tokhtamysh, and XIII—Pshart and Murgab; 5—zone of the Southwestern Pamirs with subzones XIV—Gunt and XV—Vakhan; 6—boundaries of the subzones; 7—boundaries of the zones; 8—conventional boundary of the Southwestern Pamirs zone; 9—boundary of the Kunlun and Karakorum structures; 10—anticlines; 11—synclines. Granitoids: 12—K2 − P; 13—T3 − K1 (Pamir-Shugnan type); 14—T3 − K1 (Bashgumbez type); 15—T3 − K1 (Alichur type); 16—J1?; 17—P2 − T; 18—C2; 19—PR1?; 20—PR1; 21—boundaries of gold-placer ore districts of the Eastern Pamirs: A—Rangkul, B—Pshart; 22—red line shows the road leading from Khorog towards Murghab and Rangkul.
  • Article
  • Open Access

This study investigates the compound surface modification of 7075 aluminum alloy through the High-Speed Cutting-Solid Projectile Embedded Water Jet (HSC-SPEWJ) method. The research employed SEM, XRD, TEM, and HRTEM techniques to assess how process parameters such as jet pressure, nozzle distance, and nozzle traverse speed influence surface properties, including surface quality, roughness, microhardness, residual stress, and microstructural evolution in the alloy. The results indicate that the surface of the alloy treated with the SPEWJ process primarily exhibits features such as “craters,” microcracks, and micropores, with the lowest surface roughness recorded at 0.6214 μm. The modification leads to the formation of a plastic deformation layer with depths varying between 28 and 78 μm, with the maximum depth of 78 μm achieved at a jet pressure of 15 MPa. This treatment results in an 8.8% increase in the maximum microhardness when compared to the untreated sample. The greatest work-hardened layer observed extended to a depth of 100 μm. Furthermore, the surface residual compressive stress reached −210.37 MPa, with the stress field extending to 356 μm below the surface. The HSC-SPEWJ treatment also facilitated the formation of high-density dislocations and grain refinement in the alloy, while the size of the Precipitate-Free Zone (PFZ) was reduced by 5 to 10 nm relative to the untreated sample.

Coatings

29 September 2026

(a) Machining Setup; (b) Schematic Diagram of Machining Process; (c) Cutting Tool.