Sustainable seafood production will be possible when all by-products are utilized including overlooked inorganic components, hydroxyapatite and calcium carbonate.

Calcium carbonate (CaCO3) polymorphs are some of the most abundant minerals in natural environments on Earth’s surface. They are normally linked to fields including biomineralization, global CO2 exchange or pollutants...

Eco-friendly polyvinylpyrrolidone/alginate incorporating calcium carbonate modified biosorbent waste beads for methylene blue removal: Comprehension of physio-chemical and adsorption optimization.

This study aimed to explore the potential of utilizing waste nano-barite in enhancing the properties of bitumen and asphalt mixture. The research also examined the effectiveness of waste barite powder as a filler in modifying asphalt mixture behavior. Asphalt mixture samples were prepared through wet mixing with barite modified bitumen and dry mixing with barite filler, followed by testing for Marshall Stability, Cantabro, resilience modulus, and rutting. The findings indicate that the addition of nano-barite to bitumen enhances the properties of bitumen. Furthermore, the performance of asphalt is enhanced by the inclusion of barite in both wet and dry mixing methods, as evidenced by improved Marshall Stability; for example, Marshall Stability in the dry state increases by increasing the barite content to 54.7%. Also, the amount of wear in wet mixing in the amount of 3% filler decreases with increasing barite by about 6%. In addition, the results of statistical analysis show that the improvement of asphalt mixture performance due to the addition of barite in dry, and wet mixing is significant. Utilizing waste nano-barite in bitumen and asphalt mixture improves the performance, sustainability, and energy efficiency. It optimizes raw material usage, reduces environmental impact, and improves cost-effectiveness compared to traditional additives, such as polymers, crumb rubber, or calcium carbonate. Keywords: Nano-waste barite, Asph

Metal contamination in the coastal zone of Gökova Gulf including special environmental protection area (Western Turkiye): Sediment quality indices and environmental implications.

Membrane calcification-reinforced tumor therapy mediated by versatile hollow manganese dioxide nanoplatform.

Biomimetic CaCO3-chitosan hybrid pigments inspired by sea urchin spines biomineralization: a photostable colored additive for UV-protective self-supported chitosan films.

Synergistic effect of polyvinyl alcohol fibers and spindle-like calcium carbonate on the mechanical properties and drying shrinkage of geopolymer concrete

SDERIME: Enhanced RIME algorithm with Sobol sequences and differential evolution for heavy calcium carbonate powder particle size distribution soft sensor model optimization

"Cocktail-style" probiotic co-delivery system a multi-component strategy to overcome gastrointestinal challenges.

This study evaluates the effectiveness of palm shell liquid smoke and ethylenediaminetetraacetic acid as inhibitorsof calcium carbonate crystal growth at solution concentrations of 0.0250 – 0.0500 M using the unseeded experiment method. The chemical composition of palm shell liquid smoke was characterised using IR and GC-MS, while crystal characterisation was performed using PSA, SEM, and XRD to observe particle size, morphology, and crystal phase. The results showed that palm shell liquid smoke inhibited crystal formation by 28-41%, with optimal performanceat a 25% concentration, while ethylenediaminetetraacetic acid reached 79-84%. The addition of inhibitors resultedinsmaller crystals and a more uniform particle size distribution. SEM indicated changes in crystal morphology, andXRD confirmed a phase shift from calcite to aragonite and vaterite. This demonstrates that palm shell liquid smokeeffectively disrupts crystallisation and has potential for preventing scale in industrial applications.

Synthesis of highly spherical calcium carbonate nanoparticles using air nanobubbles as additives

Parathyroid hormone guided protocols for hypocalcemia management after thyroidectomy: A systematic review.

Enhancing Staphylococcus succinus tolerance via pre-mineralization for bioflocculation-based oilfield water treatment.

ABSTRACT In soils with low cohesion, using envelopes can help reduce the entry of soil particles into drainpipes (filter function) and reduce entrance resistance by creating a more permeable zone around drains (hydraulic function). Calcareous soils with calcium carbonate (CaCO3) content of more than 15% are considered hazardous problematic soils that cause envelope clogging and sedimentation in the subsurface drainage network. Synthetic envelopes have been proposed as a relatively cheaper accessible alternative to replace gravel envelopes, besides better-quality control. However, earlier testing of synthetic drain envelopes in calcareous soils has revealed poor performance. Therefore, the main objective of this study is to investigate new granular envelope materials (GEM), derived from recycling industries, as drain-envelope alternatives to the traditionally used, hence enhancing the subsurface drainage performance in calcareous soil. Theoretical and experimental lab and field investigations were conducted to assess the performance of the recycled GEM, considering different calcareous soil characteristics. The theoretical assessment revealed that the particle size distribution of the obtained recycled GEM is compatible with calcareous soil gradation, hence they would satisfy the desired hydraulic and filtration performance. Moreover, the lab investigations proved that the proposed recycled GEM satisfy no clogging conditions, and give a distinguished filter and hydraulic functions; with a permeability comparable to that of the natural gravel. The field investigations assure lab deductions, since the utilized recycled GEM revealed a promising hydraulic performance similar to or better than the currently used gravel envelopes.

ABSTRACT Understanding early ontogenetic transitions in fish is essential for reconstructing life histories and to refine age and growth assessments. In this study, we combined microchemical and crystallographic analyses of sagittal otoliths to investigate early developmental stages in Micropogonias furnieri , a key estuarine species in the Southwestern Atlantic. Raman spectroscopy revealed that otoliths remain crystallographically stable throughout early development, with aragonite as the sole calcium carbonate polymorph even in regions of structural reorganisation. Core‐to‐edge Sr/Ca, Ba/Ca and Mn/Ca profiles were analysed by LA‐ICP‐MS on sagittal otoliths sectioned to expose the core. Elemental profiles exhibited trends aligned with key physiological and environmental transitions: a high Sr/Ca signal in the core (pre‐hatch and larval stage) in most samples, a Mn/Ca peak during metamorphosis and a progressive increase in Ba/Ca spanning the metamorphic and juvenile stages. Interindividual variability and partial misalignment with microstructural markers were observed, likely due to the complexity of the region of the otolith formed during metamorphosis and probably due to environmental heterogeneity in the Río de la Plata Estuary. These findings suggest that combining otolith elemental ratios may serve as biological “timers” to retrospectively identify early life stages, enhancing age and growth studies in estuarine fish with complex life cycles.

Understanding the nucleation and growth mechanisms of calcium carbonate (CaCO3) in multicomponent aqueous environments is essential for regulating mineralization. Here, ReaxFF molecular dynamics simulations were employed to investigate the effects of Na+ and Mg2+ on CaCO3 cluster formation. Unlike prior studies focusing on single-ion systems, we constructed Ca-Na-CO3-H2O and Ca-Mg-CO3-H2O systems to directly compare cation interference under 300 and 400 K. Results show that both Na+ and Mg2+ inhibit CaCO3 nucleation, with Mg2+ having a stronger effect by forming stable MgCO3 clusters and competing for CO32-. Na+ exhibits weaker coordination and remains mostly unbound. Elevated temperature and Mg2+ further reduce the formation of calcite-like structures. Scattering amplitude and structure factor analyses confirm that Na+ and Mg2+ induce less ordered and less compact cluster morphologies. This study highlights the value of atomistic simulations for probing ion-specific effects on nucleation, offering new insights into crystallization control in environmental and industrial applications.

Urease, a metalloenzyme widely present in various organisms, catalyzes the hydrolysis of urea to ammonia and CO2 and has been extensively utilized in studies and applications of microbially induced calcium carbonate precipitation (MICP). While microbially induced calcium carbonate precipitation (MICP) and silicate mineral bio-weathering are both important biogeochemical processes mediated by microorganisms, and their coupling has been verified in some geological environments, the potential role of urease (a key enzyme in MICP) in mineral weathering remains unreported. In this study, Bacillus velezensis LB002 served as the urease gene donor for the construction of a Bacillus subtilis strain with heterologous overexpression of urease genes. The effects of this engineered strain and the wild-type strain on serpentine weathering and secondary mineral formation were compared. The results showed that the urease activity of the overexpression strain was approximately 3.8 times higher than that of the wild-type strain, and the release of Mg2+ during serpentine weathering increased by 17 mg/L. XRD and SEM-EDS analyses revealed that the wild-type strain promoted the formation of vaterite as a secondary mineral, whereas the overexpression strain induced the precipitation of both vaterite and magnesium-containing calcite. These findings demonstrate that urease plays a synergistic role in mineral weathering and that urease overexpression significantly enhances the release of Mg2+ from serpentine and the formation of magnesium-containing calcite.

Pigment gallstones represent a heterogeneous group of concretions, classically divided into black and brown types, whose morphology and microstructure offer critical clues about their underlying pathogenesis. Gallstone formation (lithogenesis) is a complex process triggered when the physicochemical equilibrium of bile is disrupted. Background/Objectives: The spicules observed on the surface of certain black pigment gallstones have traditionally been attributed to the branching capacity of cross-linked bilirubin polymers. However, a growing body of experimental and spectroscopic evidence suggests that inorganic calcium salts, particularly calcium carbonate and calcium phosphate, play a central role in the formation of the distinctive spiculated or “coral-like” architecture. Materials and Methods: In our study, we examined a case series of 1350 consecutive patients with gallstone disease, identifying 81 patients who presented with solitary black pigment stones. We systematically explored the association between high calcium content, specifically calcium carbonate, and the occurrence of spiculated morphology. Our analyses demonstrated a robust correlation between an elevated concentration of calcium carbonate and the presence of well-defined spicules. Results: These results support the hypothesis that mineral elements, rather than organic bilirubin polymers, act as crucial determinants of the peculiar crystalline structure observed in a significant subset of pigment stones. Spiculated stones, due to their small size and sharp projections, have a higher likelihood of migrating, increasing the risk of potentially life-threatening complications, such as acute cholangitis and gallstone pancreatitis. Conclusions: Our findings, consistent with recent advanced crystallographic analyses, underscore the importance of considering mineral composition in the diagnosis and management of cholelithiasis. Understanding the factors that drive calcium carbonate precipitation is essential for developing new preventive and therapeutic strategies, aiming to modulate bile chemistry and reduce the risk of calcium-driven lithogenesis.

Purpose. Generalization of experience in the fuel use of petroleum coke using various combustion technologies and development of scientific foundations for its use for rotary kilns in the production of Portland cement clinker in compliance with environmental requirements. Methodology. Determination of the efficiency of sulfur capturing in a rotary kiln and in a decarbonizer based on the material balance of sulfur in raw materials, fuel and clinker. Determination of the permissible content of petroleum coke in fuel based on the calculating of the level of sulfur dioxide emissions using the found sulfur binding coefficient. Findings. It is shown that petroleum coke is equivalent to high-sulfur lean coal as a fuel. The experience of using petroleum coke in power plants with circulating fluidized bed (CFB) and pulverized combustion, in particular, in the boiler of the 800 MW power unit of the Slovianska TPP, is analyzed. The technology of “dry” cement production is considered. It is proven that the conditions of petcoke combustion in a rotary kiln for clinker calcination, calcium carbonate decomposition in a decarbonizer, and calcium oxide contact with sulfur dioxide coincide with the optimal conditions for sulfur capturing in the technology of coal CFB. The efficiency of sulfur capturing in a rotary kiln and in a decarbonizer is determined based on the material balance of sulfur in raw materials, fuel, and clinker. The permissible content of petroleum coke in fuel for pulverized combustion and for rotary kilns is determined based on the calculation of the level of sulfur dioxide emissions using the found sulfur binding coefficient. Recommendations for the use of petroleum coke in cement production to expand its fuel base while complying with environmental requirements are provided. Originality. The efficiency of sulfur binding of solid fuel in a rotary kiln and in a decarbonizer is determined. It is proven that in the technology of “dry” cement production with a higher proportion of petroleum coke in the fuel, sulfur dioxide emissions are 11 times lower than in pulverized combustion. A methodology for assessing the permissible content of petroleum coke in fuel for a rotary kiln is developed. Practical value. The advantages of using petroleum coke as fuel for rotary kilns in clinker production are proven. The permissible content of petroleum coke in fuel is determined while meeting EU environmental requirements. Recommendations are provided for the use of petroleum coke in cement production to expand its fuel base.