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Separation Strategies for Polyphenols from Plant Extracts: Advances, Challenges, and Applications
Sasa Savic
,Sanja Petrovic
,Zorica Knežević-Jugović
Polyphenols are a structurally diverse group of plant secondary metabolites widely recognized for their antioxidant, anti-inflammatory, antimicrobial, and chemoprotective properties, which have stimulated their extensive use in food, pharmaceutical, nutraceutical, and cosmetic products. However, their chemical heterogeneity, wide polarity range, and strong interactions with plant matrices pose major challenges for efficient extraction, separation, and reliable analytical characterization. This review provides a critical overview of contemporary strategies for the extraction, separation, and identification of polyphenols from plant-derived matrices. Conventional extraction methods, including maceration, Soxhlet extraction, and percolation, are discussed alongside modern green technologies such as ultrasound-assisted extraction, microwave-assisted extraction, pressurized liquid extraction, and supercritical fluid extraction. Particular emphasis is placed on environmentally friendly solvents, including ethanol, natural deep eutectic solvents, and ionic liquids, as sustainable alternatives that improve extraction efficiency while reducing environmental impact. The review further highlights chromatographic separation approaches—partition, adsorption, ion-exchange, size-exclusion, and affinity chromatography—and underlines the importance of hyphenated analytical platforms (LC–MS, LC–MS/MS, and LC–NMR) for comprehensive polyphenol profiling. Key analytical challenges, including matrix effects, compound instability, and limited availability of reference standards, are addressed, together with perspectives on industrial implementation, quality control, and standardization.
Polyphenols are a structurally diverse group of plant secondary metabolites widely recognized for their antioxidant, anti-inflammatory, antimicrobial, and chemoprotective properties, which have stimulated their extensive use in food, pharmaceutical, nutraceutical, and cosmetic products. However, their chemical heterogeneity, wide polarity range, and strong interactions with plant matrices pose major challenges for efficient extraction, separation, and reliable analytical characterization. This review provides a critical overview of contemporary strategies for the extraction, separation, and identification of polyphenols from plant-derived matrices. Conventional extraction methods, including maceration, Soxhlet extraction, and percolation, are discussed alongside modern green technologies such as ultrasound-assisted extraction, microwave-assisted extraction, pressurized liquid extraction, and supercritical fluid extraction. Particular emphasis is placed on environmentally friendly solvents, including ethanol, natural deep eutectic solvents, and ionic liquids, as sustainable alternatives that improve extraction efficiency while reducing environmental impact. The review further highlights chromatographic separation approaches—partition, adsorption, ion-exchange, size-exclusion, and affinity chromatography—and underlines the importance of hyphenated analytical platforms (LC–MS, LC–MS/MS, and LC–NMR) for comprehensive polyphenol profiling. Key analytical challenges, including matrix effects, compound instability, and limited availability of reference standards, are addressed, together with perspectives on industrial implementation, quality control, and standardization.
Posted: 06 January 2026
Cost and Capacity Issues in Small Hospital Departments, Difficulties in Estimating Future Demand, the Impact of Seasonality, and the Cost Reduction (If Any) from Reducing Length of Stay
Rodney P. Jones
Queuing theory and the Erlang equation are directly applicable to small hospital departments such as maternity and pediatrics. Bed capacity tables can be easily generated linking annual births/admissions to the required available beds, using expected births/admissions and length of stay (LOS). Two bed calculators are provided. For example, in maternity the total bed days includes any admissions during pregnancy and after birth, i.e., excluding the time spent in the birthing unit. It is emphasized that bed days must be calculated using real time length of stay as opposed to the usual midnight figure. The bed occupancy margin is directly linked to size and not ‘efficiency’. Based on the Erlang B equation which links available beds, occupied beds and turn-away, a figure of 0.1% turn-away has been chosen as the minimum acceptable number of beds, i.e., only 1 in a thousand admissions suffer a delay before a bed can be found. Two bed calculators are provided which can be used for obstetric, maternity, midwife-led, birthing wards and neonatal unit bed capacity. Specific issues relating to neonatal critical care bed capacity are highlighted. The negative effects of turn-away are likely to be context specific, hence, critical care > theatres > birthing unit > maternity unit. The far greater uncertainty regarding future births is discussed along with the variable nature of seasonality in births. For pediatrics much of bed demand is also influenced by the trend in births. Suggestions are made for a pragmatic approach to bed planning. Evidence is presented which suggests that for maternity (and other relative short stay admissions) the majority of overhead/indirect costs and most staffing costs should be apportioned based on admissions, and not LOS. Apportionment based on LOS creates the spurious illusion that LOS is the major cost driver and that reducing LOS will immediately save costs. Several lines of evidence point to the minimum cost per patient in maternity (antenatal + postnatal) lying greater than 30 beds (plus associated labor/birthing beds), and the minimum economic size around 12 beds. Around 30 beds probably mark the point where it is possible to make small cost savings by reducing LOS. Allocating total organizational costs to individual units and then to patients is far less precise than is realized and can be done in different ways which all heavily rely on the steady-state assumption. The real world of daily arrivals, case mix and clinical severity is never in steady state. Below 20 to 30 beds Poisson statistical plus environment induced randomness in daily arrivals imply that staff costs become increasingly fixed irrespective of LOS. When bed availability is the bottleneck then reducing LOS may increase throughput per bed and increase income, however, is this for the benefit of the patient or for the benefit of the organization, and does it lead to higher unanticipated total costs including patient harm? Finally, a list of nine ‘never do this’ catastrophic pitfalls are given for doctors to identify dubious capacity advice from managers and external ‘experts’.
Queuing theory and the Erlang equation are directly applicable to small hospital departments such as maternity and pediatrics. Bed capacity tables can be easily generated linking annual births/admissions to the required available beds, using expected births/admissions and length of stay (LOS). Two bed calculators are provided. For example, in maternity the total bed days includes any admissions during pregnancy and after birth, i.e., excluding the time spent in the birthing unit. It is emphasized that bed days must be calculated using real time length of stay as opposed to the usual midnight figure. The bed occupancy margin is directly linked to size and not ‘efficiency’. Based on the Erlang B equation which links available beds, occupied beds and turn-away, a figure of 0.1% turn-away has been chosen as the minimum acceptable number of beds, i.e., only 1 in a thousand admissions suffer a delay before a bed can be found. Two bed calculators are provided which can be used for obstetric, maternity, midwife-led, birthing wards and neonatal unit bed capacity. Specific issues relating to neonatal critical care bed capacity are highlighted. The negative effects of turn-away are likely to be context specific, hence, critical care > theatres > birthing unit > maternity unit. The far greater uncertainty regarding future births is discussed along with the variable nature of seasonality in births. For pediatrics much of bed demand is also influenced by the trend in births. Suggestions are made for a pragmatic approach to bed planning. Evidence is presented which suggests that for maternity (and other relative short stay admissions) the majority of overhead/indirect costs and most staffing costs should be apportioned based on admissions, and not LOS. Apportionment based on LOS creates the spurious illusion that LOS is the major cost driver and that reducing LOS will immediately save costs. Several lines of evidence point to the minimum cost per patient in maternity (antenatal + postnatal) lying greater than 30 beds (plus associated labor/birthing beds), and the minimum economic size around 12 beds. Around 30 beds probably mark the point where it is possible to make small cost savings by reducing LOS. Allocating total organizational costs to individual units and then to patients is far less precise than is realized and can be done in different ways which all heavily rely on the steady-state assumption. The real world of daily arrivals, case mix and clinical severity is never in steady state. Below 20 to 30 beds Poisson statistical plus environment induced randomness in daily arrivals imply that staff costs become increasingly fixed irrespective of LOS. When bed availability is the bottleneck then reducing LOS may increase throughput per bed and increase income, however, is this for the benefit of the patient or for the benefit of the organization, and does it lead to higher unanticipated total costs including patient harm? Finally, a list of nine ‘never do this’ catastrophic pitfalls are given for doctors to identify dubious capacity advice from managers and external ‘experts’.
Posted: 06 January 2026
Safety of a Tailored Gadolinium-Based Contrast Agent Protocol Considering Excretion Pathways in Patients with Renal Impairment
Jeong Woo Kim
,Chang Hee Lee
Background/Objectives: Considering the excretion pathways and gadolinium concentrations of gadolinium-based contrast agents (GBCAs), our institution has developed a tailored administration protocol for patients with renal impairment to facilitate more rapid elimination and minimal retention of gadolinium. This study aims to evaluate the 8-year clinical outcomes and safety of this institutional protocol. Methods: This single-center retrospective study included patients with renal impairment who underwent GBCA-enhanced MRI between January 2015 and December 2022. The protocol recommended specific GBCAs and adjusted doses based on chronic kidney disease (CKD) stage and serum bilirubin levels: gadoxetate disodium was used for normal serum bilirubin level due to its dual excretion pathway, while macrocyclic agents were used for those with elevated serum bilirubin levels. During the follow-up period, occurrence of nephrogenic systemic fibrosis (NSF) and evidence of gadolinium deposition in brain tissues were evaluated. Results: A total of 288 patients (age, 64.6 ± 11.7 years; male, 64.9%) underwent 716 GBCA-enhanced MRI examinations in accordance with the institutional protocol. The cohort included 62 patients with CKD stage 4 and 131 patients with CKD stage 5 or undergoing hemodialysis. In patients with CKD stage 4 and 5 and those undergoing hemodialysis, 597 examinations were performed using gadoxetate disodium, and 119 used macrocyclic agents. No cases of NSF or gadolinium deposition in brain tissues were identified over mean follow-up intervals of 27.5 and 27.8 months, respectively. Conclusions: The tailored GBCA administration protocol, considering the excretion pathways and gadolinium concentrations, appears to be safe with respect to NSF and gadolinium deposition in brain tissues for patients with renal impairment.
Background/Objectives: Considering the excretion pathways and gadolinium concentrations of gadolinium-based contrast agents (GBCAs), our institution has developed a tailored administration protocol for patients with renal impairment to facilitate more rapid elimination and minimal retention of gadolinium. This study aims to evaluate the 8-year clinical outcomes and safety of this institutional protocol. Methods: This single-center retrospective study included patients with renal impairment who underwent GBCA-enhanced MRI between January 2015 and December 2022. The protocol recommended specific GBCAs and adjusted doses based on chronic kidney disease (CKD) stage and serum bilirubin levels: gadoxetate disodium was used for normal serum bilirubin level due to its dual excretion pathway, while macrocyclic agents were used for those with elevated serum bilirubin levels. During the follow-up period, occurrence of nephrogenic systemic fibrosis (NSF) and evidence of gadolinium deposition in brain tissues were evaluated. Results: A total of 288 patients (age, 64.6 ± 11.7 years; male, 64.9%) underwent 716 GBCA-enhanced MRI examinations in accordance with the institutional protocol. The cohort included 62 patients with CKD stage 4 and 131 patients with CKD stage 5 or undergoing hemodialysis. In patients with CKD stage 4 and 5 and those undergoing hemodialysis, 597 examinations were performed using gadoxetate disodium, and 119 used macrocyclic agents. No cases of NSF or gadolinium deposition in brain tissues were identified over mean follow-up intervals of 27.5 and 27.8 months, respectively. Conclusions: The tailored GBCA administration protocol, considering the excretion pathways and gadolinium concentrations, appears to be safe with respect to NSF and gadolinium deposition in brain tissues for patients with renal impairment.
Posted: 06 January 2026
Independent Evolution of Linear and Branched Cuticular Hydrocarbons in the Desert Ant Cataglyphis niger
Abraham Hefetz
The epicuticle of Cataglyphis niger is endowed with hydrocarbons comprising both linear and branched alkanes. The linear alkanes create an impermeable layer that protects the ants from desiccation, whereas the branched alkanes have communicative roles. Studies of the biosynthesis of both classes of hydrocarbons revealed disparate pathways, which suggests an independent evolution. It is hypothesized that the driving force for the evolution of alkanes was acquiring means for attaining impermeability. Being more abundant in foragers linear alkanes have been secondarily coopted for signaling colony foraging intensity and accordingly adjusting task allocation. The evolution of branched alkanes is less clear and seems more complex. They are biosynthetically derived from branched fatty acid that may have been the roots of their evolution. Due to their bactericide activity branched fatty acids evolved as protective means. Secondarily, the biosynthesis of these acids was coopted for producing branched alkanes for communicative roles. Using branched alkanes as signals is adaptive due to their numerous isomers that convey large informational content. Moreover, being hydrophobic they blend within the linear alkane layer that covers the ants’ body surface. However, branched alkanes decrease the cuticular impermeability, so hypothetically their proportions are the result of a tradeoff steady state.
The epicuticle of Cataglyphis niger is endowed with hydrocarbons comprising both linear and branched alkanes. The linear alkanes create an impermeable layer that protects the ants from desiccation, whereas the branched alkanes have communicative roles. Studies of the biosynthesis of both classes of hydrocarbons revealed disparate pathways, which suggests an independent evolution. It is hypothesized that the driving force for the evolution of alkanes was acquiring means for attaining impermeability. Being more abundant in foragers linear alkanes have been secondarily coopted for signaling colony foraging intensity and accordingly adjusting task allocation. The evolution of branched alkanes is less clear and seems more complex. They are biosynthetically derived from branched fatty acid that may have been the roots of their evolution. Due to their bactericide activity branched fatty acids evolved as protective means. Secondarily, the biosynthesis of these acids was coopted for producing branched alkanes for communicative roles. Using branched alkanes as signals is adaptive due to their numerous isomers that convey large informational content. Moreover, being hydrophobic they blend within the linear alkane layer that covers the ants’ body surface. However, branched alkanes decrease the cuticular impermeability, so hypothetically their proportions are the result of a tradeoff steady state.
Posted: 06 January 2026
Longitudinal Landscape of Long Flu: Prolonged Influenza Complications Beyond Acute Respiratory Disease
Ming Zheng
Posted: 06 January 2026
Entropy-Based Portfolio Optimization in Cryptocurrency Markets: A Unified Maximum Entropy Framework
Silvia Dedu
,Florentin Șerban
Traditional mean–variance portfolio optimization proves inadequate for cryptocurrency markets, where extreme volatility, fat-tailed return distributions, and unstable correlation structures undermine the validity of variance as a comprehensive risk measure. To address these limitations, this paper proposes a unified entropy-based portfolio optimization framework grounded in the Maximum Entropy Principle (MaxEnt). Within this setting, Shannon entropy, Tsallis entropy, and Weighted Shannon Entropy (WSE) are formally derived as particular specifications of a common constrained optimization problem solved via the method of Lagrange multipliers, ensuring analytical coherence and mathematical transparency. Moreover, the proposed MaxEnt formulation provides an information-theoretic interpretation of portfolio diversification as an inference problem under uncertainty, where optimal allocations correspond to the least informative distributions consistent with prescribed moment constraints. In this perspective, entropy acts as a structural regularizer that governs the geometry of diversification rather than as a direct proxy for risk. This interpretation strengthens the conceptual link between entropy, uncertainty quantification, and decision-making in complex financial systems, offering a robust and distribution-free alternative to classical variance-based portfolio optimization. The proposed framework is empirically illustrated using a portfolio composed of major cryptocurrencies—Bitcoin (BTC), Ethereum (ETH), Solana (SOL), and Binance Coin (BNB)—based on weekly return data. The results reveal systematic differences in the diversification behavior induced by each entropy measure: Shannon entropy favors near-uniform allocations, Tsallis entropy imposes stronger penalties on concentration and enhances robustness to tail risk, while WSE enables the incorporation of asset-specific informational weights reflecting heterogeneous market characteristics. From a theoretical perspective, the paper contributes a coherent MaxEnt formulation that unifies several entropy measures within a single information-theoretic optimization framework, clarifying the role of entropy as a structural regularizer of diversification. From an applied standpoint, the results indicate that entropy-based criteria yield stable and interpretable allocations across turbulent market regimes, offering a flexible alternative to classical risk-based portfolio construction. The framework naturally extends to dynamic multi-period settings and alternative entropy formulations, providing a foundation for future research on robust portfolio optimization under uncertainty.
Traditional mean–variance portfolio optimization proves inadequate for cryptocurrency markets, where extreme volatility, fat-tailed return distributions, and unstable correlation structures undermine the validity of variance as a comprehensive risk measure. To address these limitations, this paper proposes a unified entropy-based portfolio optimization framework grounded in the Maximum Entropy Principle (MaxEnt). Within this setting, Shannon entropy, Tsallis entropy, and Weighted Shannon Entropy (WSE) are formally derived as particular specifications of a common constrained optimization problem solved via the method of Lagrange multipliers, ensuring analytical coherence and mathematical transparency. Moreover, the proposed MaxEnt formulation provides an information-theoretic interpretation of portfolio diversification as an inference problem under uncertainty, where optimal allocations correspond to the least informative distributions consistent with prescribed moment constraints. In this perspective, entropy acts as a structural regularizer that governs the geometry of diversification rather than as a direct proxy for risk. This interpretation strengthens the conceptual link between entropy, uncertainty quantification, and decision-making in complex financial systems, offering a robust and distribution-free alternative to classical variance-based portfolio optimization. The proposed framework is empirically illustrated using a portfolio composed of major cryptocurrencies—Bitcoin (BTC), Ethereum (ETH), Solana (SOL), and Binance Coin (BNB)—based on weekly return data. The results reveal systematic differences in the diversification behavior induced by each entropy measure: Shannon entropy favors near-uniform allocations, Tsallis entropy imposes stronger penalties on concentration and enhances robustness to tail risk, while WSE enables the incorporation of asset-specific informational weights reflecting heterogeneous market characteristics. From a theoretical perspective, the paper contributes a coherent MaxEnt formulation that unifies several entropy measures within a single information-theoretic optimization framework, clarifying the role of entropy as a structural regularizer of diversification. From an applied standpoint, the results indicate that entropy-based criteria yield stable and interpretable allocations across turbulent market regimes, offering a flexible alternative to classical risk-based portfolio construction. The framework naturally extends to dynamic multi-period settings and alternative entropy formulations, providing a foundation for future research on robust portfolio optimization under uncertainty.
Posted: 06 January 2026
Transcriptomic Analysis of Soybean Defense Mechanism Against Aphid and Nematode Co-Infestation
Surendra Neupane
,Adam Varenhorst
,Madhav P. Nepal
Soybean aphid (SBA), Aphis glycines Matsumura (Hemiptera: Aphididae), and soybean cyst nematode (SCN), Heterodera glycines Ichinoe (Tylenchida: Heteroderidae), are major pests of soybean, Glycine max L. Merr., in the U.S. Midwest. This study examined three-way interactions among soybean, SBA, and SCN using demographic and transcriptomic analyses. SCN-resistant and SCN-susceptible cultivars were evaluated under three treatments (SBA, SCN, SCN+SBA) in a randomized complete block design with six replicates, repeated eight times in greenhouse cone-tainers. Plants were infested with 2,000 SCN eggs at planting or 15 SBA at the V2 stage. Aphid populations were counted at 5-, 15-, and 30-days post-infestation (dpi), and SCN eggs sampled at 30 dpi. SCN egg density increased significantly in the susceptible cultivar but remained unchanged in the resistant cultivar in the presence of SBA, while SBA populations declined under SCN infestation. RNA-seq identified 4,637 differentially expressed genes (DEGs) at 5 dpi and 19,032 DEGs at 30 dpi. Analyses focused on DEGs shared across treatments but discordantly expressed in resistant cultivars during SBA–SCN interactions. Weighted Gene Co-expression Network Analysis revealed seven and nine modules at 5 and 30 dpi, respectively. Enrichment analyses identified ‘Plant–Pathogen Interaction’ and ‘Cutin, Suberin, and Wax Biosynthesis’ at 5 dpi, and ‘Isoflavonoid Biosynthesis’ and ‘One-Carbon Pool by Folate’ at 30 dpi. Several DEGs overlapped with SCN resistance QTLs, identifying candidate genes for cross-resistance breeding.
Soybean aphid (SBA), Aphis glycines Matsumura (Hemiptera: Aphididae), and soybean cyst nematode (SCN), Heterodera glycines Ichinoe (Tylenchida: Heteroderidae), are major pests of soybean, Glycine max L. Merr., in the U.S. Midwest. This study examined three-way interactions among soybean, SBA, and SCN using demographic and transcriptomic analyses. SCN-resistant and SCN-susceptible cultivars were evaluated under three treatments (SBA, SCN, SCN+SBA) in a randomized complete block design with six replicates, repeated eight times in greenhouse cone-tainers. Plants were infested with 2,000 SCN eggs at planting or 15 SBA at the V2 stage. Aphid populations were counted at 5-, 15-, and 30-days post-infestation (dpi), and SCN eggs sampled at 30 dpi. SCN egg density increased significantly in the susceptible cultivar but remained unchanged in the resistant cultivar in the presence of SBA, while SBA populations declined under SCN infestation. RNA-seq identified 4,637 differentially expressed genes (DEGs) at 5 dpi and 19,032 DEGs at 30 dpi. Analyses focused on DEGs shared across treatments but discordantly expressed in resistant cultivars during SBA–SCN interactions. Weighted Gene Co-expression Network Analysis revealed seven and nine modules at 5 and 30 dpi, respectively. Enrichment analyses identified ‘Plant–Pathogen Interaction’ and ‘Cutin, Suberin, and Wax Biosynthesis’ at 5 dpi, and ‘Isoflavonoid Biosynthesis’ and ‘One-Carbon Pool by Folate’ at 30 dpi. Several DEGs overlapped with SCN resistance QTLs, identifying candidate genes for cross-resistance breeding.
Posted: 06 January 2026
A Robust Intelligent CNN Model Enhanced with Gabor-Based Feature Extraction, SMOTE Balancing, and Adam Optimization for Multi-Grade Diabetic Retinopathy Classification
Asri Mulyani
,Muljono
,Purwanto
,Moch Arief Soeleman
Posted: 06 January 2026
A Plasticity Framework for Hoarding Disorder: Cross-Disorder Genomic Comparisons Reveal Divergent Compulsivity Mechanisms
Ngo Cheung
Posted: 06 January 2026
The 3D Collagen Network as a Determinant of Tumor Progression and Drug Delivery Efficiency in Breast Adenocarcinoma
Mariana Hirata
,Rogerio Padovan Gonçalves
,Maria Eduarda Teixeira Pereira Cândido da Silva
,Geovanna de Castro Feitosa
,Caio Sérgio Galina Spilla
,Domingos Donizeti Roque
,Lisete Horn Belon Fernandes
,Virgínia Maria Cavallari Strozze Catharin
,Vitor Cavallari Strozze Catharin
,Leila Maria Guissoni Campos
+8 authors
Background/Objectives: Breast cancer is a biologically complex malignancy whose high prevalence and therapeutic resistance represent a continuous challenge for global health. The Tumor Microenvironment (TME) is a crucial component in disease progression, and the Extracellular Matrix (ECM), particularly its 3D collagen architecture, is recognized for mediating interactions that influence invasion, metastasis, and pharmacological response. This review aims to critically synthesize recent evidence to elucidate the multifaceted role of collagen in the progression and modulation of therapeutic response in breast adenocarcinoma. Methods: A comprehensive literature review was conducted, analyzing studies addressing specific collagen subtypes, ECM stiffening (fibrosis), biomechanical signaling, and its impact on drug transport kinetics and immunomodulatory effects. Results: The results demonstrate that structural alterations of collagen not only orchestrate a pro-tumoral microenvironment, fostering aggressive phenotypes and immune evasion, but also create a physical barrier that compromises drug delivery efficiency and promotes metastatic dissemination. The synthesis of the data reinforces collagen as a potent prognostic biomarker and a promising therapeutic target for overcoming stroma-mediated resistance. Conclusions: Targeting the collagen-rich stroma and its 3D network is a critical frontier for therapeutic innovation. Developing adjuvant strategies to modulate the ECM has the potential to enhance clinical outcomes and optimize the distribution of antineoplastic agents, especially in patients with high degrees of tumor fibrosis.
Background/Objectives: Breast cancer is a biologically complex malignancy whose high prevalence and therapeutic resistance represent a continuous challenge for global health. The Tumor Microenvironment (TME) is a crucial component in disease progression, and the Extracellular Matrix (ECM), particularly its 3D collagen architecture, is recognized for mediating interactions that influence invasion, metastasis, and pharmacological response. This review aims to critically synthesize recent evidence to elucidate the multifaceted role of collagen in the progression and modulation of therapeutic response in breast adenocarcinoma. Methods: A comprehensive literature review was conducted, analyzing studies addressing specific collagen subtypes, ECM stiffening (fibrosis), biomechanical signaling, and its impact on drug transport kinetics and immunomodulatory effects. Results: The results demonstrate that structural alterations of collagen not only orchestrate a pro-tumoral microenvironment, fostering aggressive phenotypes and immune evasion, but also create a physical barrier that compromises drug delivery efficiency and promotes metastatic dissemination. The synthesis of the data reinforces collagen as a potent prognostic biomarker and a promising therapeutic target for overcoming stroma-mediated resistance. Conclusions: Targeting the collagen-rich stroma and its 3D network is a critical frontier for therapeutic innovation. Developing adjuvant strategies to modulate the ECM has the potential to enhance clinical outcomes and optimize the distribution of antineoplastic agents, especially in patients with high degrees of tumor fibrosis.
Posted: 06 January 2026
The Synthesis of Tetrakis(N,N-Dimethylaminomethyl)ferrocene and its Bimetallic Nickel(II) Dichloride Complex: Key Precursors for Methoxycarbonylation Ligands
Ian R. Butler
,Peter N. Horton
,William Clegg
,Simon J. Coles
,Lorretta Murphy
,Steven Elliott
The family of N,N-dimethylaminomethylferrocenes is one of the most important in ferrocene chemistry. They serve as precursors for a range of anti-malaria and anti-tumour medicinal compounds in addition to being key precursors for ferrocene ligands in the Lucite alpha process. A brief discussion on the importance of, and the synthesis of N,N-dimethylaminomethyl-substituted ferrocenes preludes the synthesis of the new ligand 1,1´,2,2´-tetrakis-(N,N-dimethylaminomethyl)ferrocene. The crystal structure of this compound is reported and a comparison is made with its disubstituted analogue, 1,2-bis-(N,N-dimethylaminomethyl)ferrocene. The tetrahedral nickel dichloride complexes of both these ligands have been crystallographically characterised. Finally, a pointer to future research in the area is given which includes a discussion of a new method to extract ferrocenylmethylamines from mixtures using additives and a new synthetic avenue from substituted cyclopentadiene itself.
The family of N,N-dimethylaminomethylferrocenes is one of the most important in ferrocene chemistry. They serve as precursors for a range of anti-malaria and anti-tumour medicinal compounds in addition to being key precursors for ferrocene ligands in the Lucite alpha process. A brief discussion on the importance of, and the synthesis of N,N-dimethylaminomethyl-substituted ferrocenes preludes the synthesis of the new ligand 1,1´,2,2´-tetrakis-(N,N-dimethylaminomethyl)ferrocene. The crystal structure of this compound is reported and a comparison is made with its disubstituted analogue, 1,2-bis-(N,N-dimethylaminomethyl)ferrocene. The tetrahedral nickel dichloride complexes of both these ligands have been crystallographically characterised. Finally, a pointer to future research in the area is given which includes a discussion of a new method to extract ferrocenylmethylamines from mixtures using additives and a new synthetic avenue from substituted cyclopentadiene itself.
Posted: 06 January 2026
Planck-Hubble-Hawking Universe: Light-Speed Rotation, No Shear, No Vorticity, 8 m/s Horizon Expansion
U.V. S. Seshavatharam
,S. Lakshminarayana
Posted: 06 January 2026
Divergent Inflammatory Profiles but No Predictive Biomarkers of Psychiatric Sequelae After Viral Infection: A 12-Month Cohort Study
Piotr Lorkiewicz
,Justyna Adamczuk
,Justyna Kryńska
,Mateusz Maciejczyk
,Małgorzata Żendzian-Piotrowska
,Robert Flisiak
,Anna Moniuszko – Malinowska
,Napoleon Waszkiewicz
Posted: 06 January 2026
Risks on Sustainable Supply Chain and Logistics
Batoul Modarress-Fathi
,Alexander Ansari
,Al Ansari
Posted: 06 January 2026
Soil Types and Degradation Pathways in Saudi Arabia: A Geospatial Approach for Sustainable Land Management
Saif Alharbi
,Khalid Al Rohily
Posted: 06 January 2026
PV Modules Stored on Farmlands after Repowering: Sustainability and Environmental Impact
Martin Kozelka
,Jiří Marcan
,Vladislav Poulek
,Václav Beránek
,Tomáš Finsterle
,Agnieszka Klimek-Kopyra
,Marcin Kopyra
,Martin Libra
,František Kumhála
Ground‑mounted photovoltaics, including agrivoltaic concepts, are increasingly deployed on agricultural land. In practice, damaged modules from repowering modules are sometimes stored on‑site for prolonged periods, creating localized vegetation suppression and land‑stewardship concerns that are rarely quantified. We present two anonymized case studies from Czechia (nominal capacities of 0.861 and 1.109 MWp; commissioned 2010 and 2009; repowered 2022 and 2021), where cracked backsheets and/or broken front‑glass modules were stacked and stored directly on grasslands within PV parcels. Using GIS delineation on orthophotos supported by field photographs, we quantified the land area (19,560 and 22,100 m²), PV panel area (plan‑ view; 4,960 and 5,080 m²), and stored PV module area (plan‑ view storage footprint; 109 and 100 m²). Stored module counts were estimated from visible stacks (≈1800 and ≈2000 modules). Using a conservative mass range of 18–25 kg/module, the stored masses were ~32–45 t and ~36–50 t, respectively. Although the storage footprints constitute <1% of the land area, they create persistent “dead zones” on agricultural land and concentrate tens of tonnes of material directly on the soil. We discuss regulatory and economic barriers to timely removal in the context of circular‑economic goals and propose practical reporting indicators for repowering projects on agricultural land: Astore (m²), Nstore (pcs), Mstore (t), storage duration, condition class, and storage interface.
Ground‑mounted photovoltaics, including agrivoltaic concepts, are increasingly deployed on agricultural land. In practice, damaged modules from repowering modules are sometimes stored on‑site for prolonged periods, creating localized vegetation suppression and land‑stewardship concerns that are rarely quantified. We present two anonymized case studies from Czechia (nominal capacities of 0.861 and 1.109 MWp; commissioned 2010 and 2009; repowered 2022 and 2021), where cracked backsheets and/or broken front‑glass modules were stacked and stored directly on grasslands within PV parcels. Using GIS delineation on orthophotos supported by field photographs, we quantified the land area (19,560 and 22,100 m²), PV panel area (plan‑ view; 4,960 and 5,080 m²), and stored PV module area (plan‑ view storage footprint; 109 and 100 m²). Stored module counts were estimated from visible stacks (≈1800 and ≈2000 modules). Using a conservative mass range of 18–25 kg/module, the stored masses were ~32–45 t and ~36–50 t, respectively. Although the storage footprints constitute <1% of the land area, they create persistent “dead zones” on agricultural land and concentrate tens of tonnes of material directly on the soil. We discuss regulatory and economic barriers to timely removal in the context of circular‑economic goals and propose practical reporting indicators for repowering projects on agricultural land: Astore (m²), Nstore (pcs), Mstore (t), storage duration, condition class, and storage interface.
Posted: 06 January 2026
Bayesian Elastic‑Net Cox Models for Time‑to‑Event Prediction: Application with Breast‑Cancer Cohort
Ersin Yılmaz
,Syed Ejaz Ahmed
,Dursun Aydın
Posted: 06 January 2026
The Philosophy of Marriage in India: A Tripartite Analysis of Contract, Institution, and Moral Bond
Shashank Tiwari
Posted: 06 January 2026
Graphene Oxide Nanoparticles Mediated Protective Effect Against the Ethanol Induced Gut-Liver Axis by Targeting miRNA-203a and miRNA-122
Hiral Aghara
,Teja Naveen Sata
,Prashsti Chadha
,Manali Patel
,Md Ismail
,Deeksha Rajput
,Pooja Gori
,Sriram Kanvah
,Manan Raval
,Senthil Kumar Venugopal
+1 authors
Posted: 06 January 2026
Large Language Models for Continual Relation Extraction
Sefika Efeoglu
,Adrian Paschke
,Sonja Schimmler
Posted: 06 January 2026
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