Search Results (7,968)

Mine leachate and saline industrial wastewater streams are often treated as liabilities to be remediated or disposed of. These flows often contain substantial water and dissolved mineral resources that can be reclaimed. In this work, a waste-heat-assisted falling-film evaporation reactor was developed and assessed for application as a pre-concentration step before water and mineral recovery processes. Two case studies were considered: synthetic saline wastewater containing 80 g/L Na₂SO₄ and 70 g/L NaCl for salt recovery, and iron-rich mine water containing approximately 4000 mg/L Fe²⁺, 95 mg/L Fe³⁺, and 13,000 mg/L acidity as CaCO₃ for downstream pigment and magnetite recovery. Saline water or mine leachate flows down a bank of vertical conduit pipes as a thin film while air flows through the pipe cores. Heat is transferred to the system from industrial waste gas externally. Psychrometric relationships, heat transfer, energy balances, and techno-economic analysis were used to assess the impact of air temperature, conduit diameter, column height, pipe material, and waste-gas temperature on overall reactor performance. Experiments were carried out to confirm expected psychrometric operation and establish appropriate operating temperatures while confirming the impact of conduit geometry on heat-transfer characteristics. A benchmark case of design evaporation rate equal to 100 L/h was chosen for comparison of all tests. Dry air operation was shown to be technically possible but severely limited by the moisture capacity of air; at 26 °C and 101.3 kPa, approximately 205,000 m³/h of air was required. When using industrial waste heat, the operation changed from psychrometric/mass-transfer-limited to heat-transfer-controlled. Using waste gas entering at 144 °C and exiting at 80 °C reduced airflow requirements to approximately 880 m³/h, allowing a much more compact reactor design with approximately 635 (12 mm diameter) conduit pipes. Relative to the 40 °C air benchmark, electrical power was reduced from approximately 24.7 kW to 2.9 kW, and screening-level reactor cost by ~84%. Findings demonstrated that appropriate waste heat enables the application of evaporation if there is sufficient local heat flux. Smaller conduit diameters, sufficient column height, and greater waste-gas inlet temperatures were all beneficial. Choice of material required trade-offs between heat-transfer coefficient, corrosion, and material cost. Full article

Background/Objectives: The primary objective was to assess reference intervals for fetal Global Longitudinal Strain (GLS) using bidimensional speckle-tracking echocardiography (2D-STE), including only prospective studies specifically designed for this purpose. An additional objective was to evaluate studies’ methodological quality and reproducibility. Methods: The study is a systematic review registered at PROSPERO (CRD420251038889). Five electronic databases (Web of Science, Scopus, MEDLINE/PubMed, EMBASE and LILACS) were searched, from inception to May 2025. Prospective studies specifically designed to establish 2D-STE GLS reference intervals in low-risk singleton pregnancies with normal fetuses were included. Data were independently extracted by two reviewers. Risk of bias was assessed using an adapted tool, including study design and statistical and reporting methods. Results: After the initial identification of 187 records, nine studies published between 2012 and 2025 were included. There was marked heterogeneity among the studies. Four articles achieved high-quality scores (>70%) and three reported similar left ventricular (LV) GLS at 24 weeks (−22%). Right ventricular GLS absolute values were slightly lower than LV values. Regression models for both ventricles showed GLS absolute values decreased with gestation across studies. The 2D-STE algorithm (endocardial versus myocardial) was the main source of discrepancy between studies. Conclusions: High-quality prospective studies show a consistent pattern of biventricular GLS variation with gestational age. However, technical heterogeneity, lack of standardization, operator subjectivity and vendor-specific algorithm differences currently limit the applicability of the method. Multicentric studies with large sample sizes, standardized protocols and artificial intelligence-assisted tools are needed to consolidate this technique. Full article

β-Nicotinamide mononucleotide (NMN) is an important intermediate in nicotinamide adenine dinucleotide (NAD⁺) metabolism and has attracted increasing interest as a bioactive compound and biomanufacturing product. In this study, Pseudomonas putida KT2440 was engineered for NMN production using a “block–enhance–transport” strategy. Deletion of nicB impaired nicotinic acid degradation and resulted in the accumulation of 66.2 μM nicotinic acid in cell extracts, whereas additional deletion of the putative NMN-consuming genes pncC and ushA did not lead to detectable NMN accumulation. Coexpression of endogenous pncB and engineered Francisella tularensis nadE* enabled low-level NMN formation through a Preiss–Handler pathway-based route. By contrast, overexpression of endogenous nadA, nadB, and nadC strengthened precursor supply through the NAD⁺ de novo biosynthetic pathway and resulted in approximately 0.17 mM NMN in cell extracts. Chromosomal integration of an engineered Salmonella enterica pnuC* transporter cassette was associated with pronounced extracellular NMN accumulation. Additional overexpression of genes involved in downstream NAD⁺ metabolism or phosphoribosyl pyrophosphate supply did not considerably improve production, possibly because of metabolic competition or expression burden. The best-performing strain, LW10, produced 1.28 mM extracellular NMN, corresponding to approximately 0.43 g/L, after 96 h of shake-flask cultivation in basal salt medium containing glucose and L-aspartate. These results suggest the feasibility of NMN biosynthesis in engineered P. putida KT2440 and highlight the importance of balancing precursor supply, competing reactions, and product transport. Thus, P. putida KT2440 represents an alternative chassis for further pathway balancing and process optimization toward fermentative NMN production. Full article

Background/Objectives: Nutritional support may improve the tolerance and effectiveness of definitive treatment in patients with head and neck cancer (HNC). The aim of this study was to investigate the potential clinical deterioration in patients who refuse nutritional consultations and oral nutritional supplementation during chemoradiotherapy (CHRT) for HNC. Methods: The study included 52 patients undergoing CHRT for HNC. Among these patients, 22 (42.3%) received nutritional counseling with oral nutritional supplementation (NCONS), while 30 (57.7%) patients refused NCONS (R-NCONS). The study aimed to investigate and compare the association of NCONS with weight loss, blood parameters, CHRT complications, and overall survival (OS) between the two groups. Results: At the end of CHRT, the R-NCONS group exhibited significantly higher CRP levels (18 mg/L vs. 4 mg/L; p = 0.013) and lower prealbumin levels (0.19 g/L vs. 0.27 g/L; p = 0.003) compared with NCONS group. Furthermore, R-NCONS patients experienced a higher rate of overall complications during CHRT (67% vs. 32%; p = 0.013), required enteral nutrition more frequently (20% vs. 0%; p = 0.033), and exhibited greater weight loss (−11% vs. −5%; p < 0.001). However, the 5-year OS did not differ significantly between the groups. Conclusions: The study demonstrates that while NCONS minimizes overall complications during CHRT, its refusal results in weight loss, elevated CRP and depleted prealbumin levels, and a more frequent need for enteral nutrition interventions. Full article

Background: Gastrointestinal (GI) involvement is increasingly recognised in paediatric SARS-CoV-2 infection and multisystem inflammatory syndrome in children (MIS-C), but severe GI bleeding remains rare. Its pathogenesis in this setting is multifactorial: direct viral injury, hyperinflammatory microvascular damage, treatment-related mucosal injury, and coagulopathy may all contribute, and the relative role of each is often difficult to disentangle. Case Presentation: A previously healthy 12-year-old boy underwent appendectomy for perforated appendicitis with peritonitis. On postoperative Day 1, he developed high fever and was found to be SARS-CoV-2 PCR-positive; SARS-CoV-2 IgM and IgG were also positive. He met the positive clinical elements of the CDC 2023 case definition for MIS-C (persistent fever, multisystem involvement—gastrointestinal, hepatic, haematological, and markedly elevated inflammatory markers), although perforated appendicitis with peritonitis is a sufficient alternative explanation and the diagnosis cannot be regarded as secure (see Discussion). Treatment included broad-spectrum antibiotics (meropenem, amikacin, metronidazole), methylprednisolone 2 mg/kg/day, and intravenous immunoglobulin (IVIG) 2 g/kg. On Day 4 in the paediatric intensive care unit (PICU), the patient developed sudden haematemesis with fresh blood through the nasogastric tube and haemodynamic collapse. Coagulation studies revealed prolonged INR (1.6) and reduced prothrombin activity (42%). The patient was stabilised with packed red blood cells, fresh frozen plasma, and intravenous vitamin K. Fibrogastroscopy demonstrated diffuse mucosal bleeding without ulcers or anatomical defects; histology showed mucosal hyperaemia, mixed basal inflammation with intraepithelial lymphocytes, and small erosions. Melena persisted for several days. The child recovered fully and was discharged after 20 days with substantially improved but not fully normalised laboratory values (residual mild anaemia, Hb 110 g/L, and elevated CRP 32.7 mg/L and D-dimer 5.88 mg/L). Conclusions: Severe upper GI bleeding is a rare but life-threatening event in children with severe SARS-CoV-2 infection and MIS-C. In our case, several mechanisms may have acted in combination, although none could be confirmed individually: possible direct viral enterocyte injury via ACE-2 receptors, hyperinflammatory microangiopathy, high-dose corticosteroid-related mucosal injury, possible broad-spectrum antibiotic-associated vitamin K deficiency, and postoperative critical-illness stress. Their relative contributions cannot be determined from a single retrospective case. Bleeding occurred despite continuous PPI prophylaxis, suggesting that PPI cover alone is insufficient when multiple risk factors coexist; the clinical implication is that risk-factor-based (rather than universal) PPI prophylaxis, together with monitoring of vitamin K-dependent coagulation, should be considered in critically ill children receiving high-dose corticosteroids and prolonged broad-spectrum antibiotics. Full article

Background: Late-onset neutropenia (LON) and hypogammaglobulinemia are recognized sequelae of rituximab therapy in B-cell non-Hodgkin lymphoma, and both may leave patients vulnerable to infection once treatment has ended. Methods: Fifty-three patients with newly diagnosed, unfavorable diffuse large B-cell lymphoma (DLBCL) who entered remission on dose-adjusted (DA) R-EPOCH immunochemotherapy were retrospectively evaluated. Neutropenia (absolute neutrophil count < 1.5 × 10⁹/L, CTCAE-graded), hypogammaglobulinemia and infections were registered at treatment completion and 6 and 12 months later. Results: All laboratory parameters changed significantly over time. Most reached their nadir at the end of treatment, whereas the absolute neutrophil count alone reached its lowest value later, at 6 months. Neutropenia, largely mild to moderate, affected 17.6% of patients at treatment completion, 22.4% at 6 months and 7.9% at 12 months. Neutropenia at 6 months was a new event, with no overlap with end-of-treatment neutropenia, and was mostly transient. Hypogammaglobulinemia (IgG < 5 g/L) occurred in 33.3%, 16.7% and 20.0%, respectively; median IgG declined to a nadir at the end of treatment and recovered thereafter, although the deficit tended to persist in the same patients. Post-treatment infections were recorded in 73.6% of patients (mostly respiratory); neutropenia was not associated with infection at any time point, whereas end-of-treatment hypogammaglobulinemia was associated with respiratory infection (p = 0.040). The independent predictors of 6-month neutropenia were a greater number of dose-escalated cycles, lower baseline leukocyte count and the absence of on-treatment infection, whereas 6-month hypogammaglobulinemia was predicted by autologous transplantation and the absence of B symptoms. In exploratory body composition analyses, lower baseline psoas muscle mass was associated with end-of-treatment neutropenia (p = 0.042) and greater muscle loss with other site (skin and gastrointestinal) infection (p = 0.004). Conclusions: After DA-R-EPOCH, LON is a delayed and largely transient event separate from end-of-treatment neutropenia, whereas hypogammaglobulinemia is more persistent and clinically relevant for respiratory infections. Full article

Fractional memory can substantially alter the period-doubling route to chaos, but the joint effects of fractional order q and memory length M on successive bifurcations in the finite-memory Grünwald–Letnikov (GL) fractional logistic map remain unclear. We formulate the period-doubling bifurcations of its exact periodic orbits as an exact Floquet problem. An algebraically equivalent periodic–antiperiodic phase reduction lowers the nonlinear system from $mM+M+1$ to $2m+1$ unknowns, making very long memory lengths computationally accessible. The reduced formulation reproduces an independently derived fixed-point bifurcation boundary with a maximum absolute discrepancy of $2.67\times {10}^{-15}$ and is further confirmed for successive doublings of period-4, period-8, and period-16 orbits. We compute the first seven cascade levels for orbit periods $m=1,2,4,8,16,32,64$ and memory lengths up to $M=2\times {10}^6$. Increasing M shifts these bifurcation points toward smaller values of the bifurcation parameter, with markedly stronger shifts at lower q. The dependence on q is nonmonotone: decreasing q first shifts the bifurcations toward smaller values and then reverses this trend. For $m=1,8,32$, the turnover locations move from $q\approx 0.46–0.49$ at $M=100$ to $q\approx 0.24–0.25$ at $M=2\times {10}^6$. The $O\left(M^{-q}\right)$ decay of the GL memory tail explains the stronger memory-length effect at low q, while the positive near-classical sensitivities and the fixed-memory $q\to 0^{+}$ limit explain the turnover. These results provide an exact and scalable framework for quantifying how finite fractional memory reorganizes the period-doubling cascade. Full article

Residual microalgal biomass generated during wastewater phytoremediation represents an underexploited resource for developing sustainable bioprocesses. This study investigated the biotechnological valorization of phytoremediation-derived Chlorella biomass through an integrated process combining α-amylase-assisted saccharification and fermentation with the non-conventional yeast Wickerhamomyces sp. UFFS-CE-3.1.2 in a stirred-tank bioreactor. Following physical pretreatment to enhance intracellular compound accessibility, fermentation was conducted for 72 h under anaerobic conditions, and temporal changes in enzymatic activities and fermentation-associated compounds were monitored by spectrophotometric assays and high-performance liquid chromatography (HPLC), respectively. The integrated process exhibited distinct temporal profiles of hydrolytic and antioxidant enzyme activities, with maximum activities of 1275.23 U/mL for catalase, 1014.59 U/mL for ascorbate peroxidase, 1291.67 U/mL for protease, and 228.75 U/mL for lipase. Amylase activity remained detectable throughout the 72 h process. Total sugars decreased from 8.88 g/L at 0 h to 0.03 g/L at 72 h. In comparison, glycerol peaked at 5.62 g/L at 18 h, and ethanol remained at approximately 1.0 g/L between 18 and 48 h. Because several enzymatic activities were already detected before yeast inoculation, the observed profiles cannot be attributed exclusively to Wickerhamomyces sp. and should instead be interpreted as characteristics of the integrated bioprocess. Overall, the results demonstrate that residual Chlorella biomass generated during wastewater phytoremediation can serve as a renewable feedstock for further biotechnological processing, supporting an extended valorization pathway within a circular bioprocessing framework. Full article

The emergence of resistance-associated mutations in coronavirus main protease (Mpro) poses a significant challenge to the development of broad-spectrum antiviral therapeutics. In this study, we improved and accelerated a mutation-aware machine learning (ML) framework to predict the binding score of Nirmatrelvir analogue ligands against wild-type and mutant MERS-CoV Mpro. A library of 15,889 Nirmatrelvir derivatives generated through systematic scaffold modification was docked against the wild-type and five variants of the Mpro, producing a total of 95,334 structural and docking score datasets of these protein–ligand complexes. During the ML model development phase, ligand effects were learned from RDKit molecular descriptors and graph-based representations, and the mutation-induced effects were captured through delta-encoded physicochemical properties (hydrophobicity, charge, aromaticity, and polarity) of the active-site residues. Among the evaluated models, the CatBoost regressor tree-based algorithm achieved the lowest mean absolute error (MAE) value of 0.23 Kcal/mol and an R² of 0.87. Further improvement was achieved by creating a weighted ensemble model combining the CatBoost regressor, XGBoost and LightGBM regressor, resulting in a prediction accuracy with a MAE of 0.19 Kcal/mol and an R² of 0.90 relative to docking scores. Model robustness was further evaluated through random-, ligand group- and scaffold group- K-fold cross-validation along with their Y-randomization. Moreover, the models were also tested with a new set of 1000 structurally diverse compounds. SHAP analysis was conducted, which identified 20 molecular descriptors critical for accurate predictions. The ensemble model accurately predicted the binding affinities of Nirmatrelvir and its four analogues (E1–E4), reproducing the experimental pIC50 trend and correctly identifying the most potent inhibitors. The ensemble model also showed consistent performance across all MERS-CoV Mpro variants, S147Y, S142G, L144A, S142G/S147Y, and S142G/L144A/S147Y, demonstrating its potential for rapidly discovering mutation-resistant antiviral drugs. Full article

Low-glutamic-acid monosodium glutamate wastewater (L-MSGW), characterized by high (NH₄)₂SO₄ concentrations, presents significant challenges for conventional treatment. γ-Polyglutamic acid (γ-PGA) production using industrial wastewater is an economical and environmentally friendly strategy. In the current study, we isolated and identified Bacillus subtilis GB, which exhibited exceptional tolerance to (NH₄)₂SO₄, and capability for the high-efficiency biosynthesis of γ-PGA using untreated L-MSGW. Fermentation conditions were optimized using single-factor experiments coupled with response surface methodology, followed by scale-up validation in a 5 L fermenter. Under optimal conditions, the maximum γ-PGA yield reached 16.57 g/L with a minimal glutamate consumption of only 4.9 g/L. The study validated the feasibility of efficient γ-PGA production from L-MSGW by B. subtilis GB, providing a novel technical approach and theoretical basis for low-cost treatment and high-value resource utilization of L-MSGW. This study not only demonstrates the low-cost L-MSGW can be used for the high-value γ-PGA by B. subtilis GB but also provides a sustainable and economically viable solution for industrial wastewater treatment. Full article

In the present research, the application of a photocatalytic reactor operated under simulated solar-light-assisted air gap membrane distillation (AGMD) is proposed to remove ketoprofen from seawater. TiO₂ at a concentration of 1 g/L, containing sulfur, was applied as a photocatalyst. The AGMD process was carried out under a feed temperature of 60–80 °C and a membrane area of 131 cm² during long-term operation. Simulated solar light was applied as an irradiance source. At the first stage of the process, the feed was concentrated for 73 h, and after that, the solution of seawater spiked with ketoprofen was photocatalytically treated for 96 h. Based on the experiments, it was found that 51% of ketoprofen was removed after the solar-driven photocatalysis process. Pure distillate without salts (conductivity below 2 µS/cm) and ketoprofen were obtained after 73 h. The performance of the membrane exhibited ca. two times higher permeate flux at an operation temperature of 80 °C in comparison with 60 °C, i.e., 24.7 L/h·m² and 47.3 L/h·m², respectively. Despite the presence of small deposits on the membrane surface, no membrane wetting was observed. The concentration of ketoprofen in the concentrates during the AGMD process and solar-driven photocatalysis can remove this pharmaceutical even from matrices enriched with salts (high AGMD concentrate), with good efficiency. Full article

Carbonate thermochemical activation is a promising approach for modifying the mineralogical structure of nepheline–red mud mixtures prior to subsequent alkaline processing. However, quantitative statistical relationships between activation parameters and phase transformation remain insufficiently explored. In this study, Response Surface Methodology (RSM) combined with a Central Composite Design (CCD) was employed to develop and experimentally validate a quadratic regression model describing the influence of activation temperature, activation time, and NaHCO₃ concentration on cancrinite formation. Quantitatively determined cancrinite content obtained by X-ray diffraction (XRD) phase analysis was selected as the mineralogical response variable, enabling direct statistical evaluation of cancrinite-forming transformation. The developed quadratic model was statistically significant (F = 21.24, p < 0.0001) and explained 95.5% of the variability in the measured response (R² = 0.9550). Activation time exerted the strongest statistical influence on cancrinite formation, while activation temperature and NaHCO₃ concentration also showed statistically significant effects; the investigated interaction terms were not statistically significant. Numerical optimization identified a favorable region for cancrinite formation, with a predicted maximum response of 22.75 wt.%. Three independent validation experiments performed at practically selected operating conditions of 260 °C, 4 h, and 110 g/L NaHCO₃ yielded an average cancrinite content of 20.0 ± 1.0 wt.%. The principal novelty of the study lies in the use of quantitatively determined cancrinite content as the response variable in RSM, providing a direct statistical description of mineralogical transformation rather than optimization based solely on conventional technological responses. The developed model provides a quantitative framework for evaluating factor effects and identifying favorable activation conditions within the investigated experimental domain. Full article

Germanium is a critical rare-dispersed metal with irreplaceable applications in infrared optics, fiber-optic communications, and semiconductor industries, making its efficient recovery from secondary resources of great strategic importance. This study investigates the selective recovery of germanium from complex zinc smelting leachates using a novel hydroxamic acid extractant, BGYW, in synergistic combination with P204. The feed solution contained approximately 360 mg/L Ge, 10,790 mg/L Fe²⁺, and 98,530 mg/L Zn, representing a highly complex matrix. Continuous counter-current extraction was performed in a 30-stage miniature mixer-settler. Under optimized conditions of 10% BGYW + 5% P204 in white oil, an O/A ratio of 1:1, and 8 mol/L NH₄F as strippant, the single-stage germanium extraction efficiency reached 99.4%. Over 16 consecutive cycles, the extraction system maintained stable performance with average germanium extraction above 99%. A 3-stage scrubbing section using 50 g/L H₂SO₄ effectively removed co-extracted Zn, Cu, and Al impurities. Iron co-extraction, a major challenge, was successfully mitigated through a 2–3 stage iron scrubbing step using a chloride-containing scrubbing solution, which reduced the iron concentration in the strip liquor from approximately 600 mg/L to below 4 mg/L, and decreased the Fe/Ge mass ratio from 0.197 to below 0.01. The overall germanium recovery across the entire 30-stage continuous process reached 98.82%, and the dissolution loss of BGYW in the aqueous phase was reduced by over 85% compared to the conventional YW100 extractant. Third-phase formation caused by residual organic flocculants from the leaching step was eliminated through enhanced pre-treatment, while ferric fluoride precipitation in the stripping section was resolved by incorporating the iron scrubbing stage. This study demonstrates that the BGYW-P204 extraction system with the integrated iron scrubbing step offers an efficient, stable, and industrially viable approach for germanium recovery from zinc smelting leachates, providing a practical solution to the long-standing challenge of germanium–iron separation and contributing to the sustainable supply of this critical metal. Full article

Polyphenol-rich pomegranate juice (PJ) has attracted growing interest in its health-promoting properties. However, most studies have focused on purified extracts rather than the whole beverage. Here, we evaluated the effects of whole PJ on gut microbiota composition and functionality using the Simulator of the Human Intestinal Microbial Ecosystem (SHIME^®). The PJ was characterized by a high polyphenol content (2.3 g/L) and largely dominated by anthocyanins (~98% of identified compounds), with ellagic acid derivatives and flavonols present at lower concentrations. Following 7 days of treatment in the SHIME^® model, PJ polyphenols exhibited a bioaccessibility of 20–30%, in agreement with data from the literature. PJ supplementation induced a time-dependent modulation of the gut microbiota, leading to enhanced microbial fermentation and increased SCFA production, particularly in the descending colon, where total SCFA levels surpassed baseline values and reached 100 mmol/L. Moreover, PJ promoted the enrichment of beneficial taxa, including Akkermansia, supporting the ability of the whole juice matrix to improve gut microbial composition and metabolic activity. Overall, these findings support the potential of whole pomegranate juice as a functional food capable of modulating gut microbiota composition and activity. Full article

Pedro Ximénez sweet wines are traditionally produced from raisined grapes and are characterised by very high sugar and ethanol contents. However, there is growing interest in wines with lower sweetness and improved sensory balance. The aim of this study was to evaluate the effect of controlled partial fermentation of Pedro Ximénez raisined grape must prior to fortification on the chemical and sensory properties of the resulting wines. Fermentations were conducted until ethanol concentrations of 3.0, 5.0, 6.5, and 7.7% (v/v) were reached, after which fermentation was arrested, and all wines were standardized to a final ethanol concentration of 9% (v/v). Fermentation progression resulted in a reduction of residual sugar content from 445 to 313 g/L and significant increases in titratable acidity, volatile acidity, glycerol, higher alcohols, ethyl acetate, and 2-phenylethanol. Hierarchical cluster analysis confirmed that fermentation degree was the main factor driving wine differentiation. Sensory evaluation showed that partial fermentation reduced the intensity of characteristic descriptors such as honey, raisin, and fig while simultaneously decreasing sweetness perception and increasing freshness and overall balance. Wines fermented to 6.5 and 7.7% (v/v) ethanol received the highest preference scores from the expert sensory panel. These results indicate that controlled partial fermentation is a feasible technological strategy for modifying the composition and sensory profile of Pedro Ximénez wines and provide a basis for further optimization of alternative, less sweet Pedro Ximénez-style wines. Full article