Search Results (9,913)

Artificial lighting is a central and resource-intensive component of controlled environment agriculture, directly regulating plant physiological processes while influencing energy efficiency and production outcomes. Chlorophyll fluorescence analysis, particularly pulse-amplitude-modulated fluorometry, provides a rapid and non-destructive method for assessing plants’ photosynthetic efficiency. However, the extent to which chlorophyll fluorescence reflects plant responses to different light spectra across species remains insufficiently understood. In this study, species-specific photoresponses of leafy vegetables (Amaranthus tricolor, Barbarea verna, Chrysanthemum coronarium, Perilla frutescens) to different light spectra were investigated by integrating chlorophyll fluorescence with growth, antioxidant, and pigment traits. Plants were cultivated under monochromatic red, blue, and combined red–blue light, with additional far-red supplementation. Correlation analysis was performed among growth, antioxidant parameters, pigment contents, and chlorophyll fluorescence parameters. The obtained results show that chlorophyll fluorescence parameters respond selectively, but species-specifically, to applied lighting-spectrum conditions. Relationships between fluorescence indices and physiological traits varied between species, and no single parameter consistently reflected plant performance across all crops. Therefore, to employ chlorophyll fluorescence as a useful proxy for assessing plant responses to lighting spectrum, a species-specific and context-dependent approach is required. Full article

Passion fruit (Passiflora edulis) quality is defined by integrated sensory and nutritional traits, including sugar–acid balance, volatile organic compounds (VOCs), pigment-related attributes, and bioactive compounds such as ascorbic acid and phenolics. These traits emerge from coordinated regulation of carbon allocation, mineral nutrition, ripening metabolism, and stress- and defense-related signaling pathways, which are strongly modulated by environmental conditions. Sustainable biological inputs are increasingly explored as tools to influence these regulatory networks; however, evidence linking such interventions to reproducible fruit quality outcomes in Passiflora remains fragmented. This review first synthesizes current knowledge on the physiological, biochemical, and molecular mechanisms underlying passion fruit quality formation and maintenance, and then discusses how biofertilizers; microbial inoculants (including plant growth-promoting rhizobacteria—PGPR and arbuscular mycorrhizal fungi—AMF); fungal-derived elicitors such as chitosan and chitooligosaccharides; and complementary postharvest biological strategies may modulate these processes. Emphasis is placed on traits beyond yield, including sugar–acid balance, aroma and VOC profiles, color, nutritional quality, texture, and shelf life. By integrating genomics, transcriptomics, metabolomics, proteomics, and microbiome-based evidence, we examine how environmental modulation and key signaling pathways intersect with metabolic networks underlying fruit quality. Available studies indicate that responses to biological inputs are context-dependent and often non-linear. Key knowledge gaps and priorities for mechanism-informed sustainable management of passion fruit quality are identified. Full article

Arsenic-contaminated groundwater is a major environmental concern, particularly in northern Argentina. Here, Microbacterium oxydans AE038-20, isolated from arsenic-rich groundwater, was investigated to elucidate its tolerance and transformation capacity. Growth assays showed that the strain tolerates inorganic arsenic [As(III), As(V)] and methylarsenite [MAs(III)] without significant inhibition. Speciation analyses revealed progressive oxidation of As(III) to As(V), reaching near-complete conversion after 10 days. Similarly, MAs(III) was fully oxidized to MAs(V). Genome sequencing identified ars-related determinants, including arsR, arsC, putative arsenite efflux systems, and arsP, supporting detoxification via arsenate reduction and arsenite efflux. Proteomic analyses confirmed the expression of proteins related to arsenic resistance, oxidative stress response, and metal transport. However, no canonical arsenite oxidases were detected at either the genomic or proteomic level. Despite this, M. oxydans AE038-20 exhibited clear arsenic oxidation activity. The detection of pigment-associated proteins and in vitro oxidation assays suggest an alternative mechanism potentially mediated by redox-active pigments. These findings highlight an alternative pathway for arsenic transformation in environmental bacteria. Full article

Polysaccharide-based microparticles have emerged as suitable carriers and stabilizers of active substances, showing potential to stabilize bioactive compounds during storage and gastrointestinal digestion, thereby improving their bioaccessibility and bioavailability. This narrative review provides a comprehensive overview of the main polysaccharides employed as wall materials, including starch, maltodextrin, alginate, pectin, inulin, chitosan, and gum Arabic, and discusses how structural interactions and physicochemical properties can positively influence the microencapsulation of polyphenols and pigments. The principles and main findings of the main microencapsulation techniques, including spray-drying, freeze-drying, extrusion, emulsification, and coacervation, are briefly described. Polysaccharides can entrap both hydrophilic and hydrophobic compounds through physical interactions, forming a barrier around the nucleus or binding to the bioactive compound. Intermolecular binding between polysaccharides in the wall matrix, polyphenols, and pigments in the nucleus can confer up to 90% encapsulation efficiency, primarily governed by hydrogen bonds and electrostatic interactions. The mixture of wall polysaccharides in the microparticles synthesis favors the encapsulation solubility, storage stability, bioaccessibility, and bioactivity of the microencapsulate compounds. Clinical trials regarding the bioefficacy of polyphenols and pigments loaded in polysaccharide microparticles are scarce and require further evidence to reinforce the use of this technology. Full article

Milk color reflects the optical output of a complex colloidal system governed by protein micelles, fat globules, and serum phase interactions. In this study, we evaluated whether CIE Lab* color parameters can explain variation in milk composition and somatic cell count (SCC) using Lasso-based multiple linear regression and Extreme Gradient Boosting (XGBoost). A total of 119 Holstein milk samples were analyzed for fat, protein, lactose, dry matter, electrical conductivity, freezing point, and SCC, and five color indices (L*, a*, b*, Hue, and Chroma) were used as predictors. Model robustness was evaluated using 10-fold cross-validation and an independent 80/20 train–test split. In regression analyses, Lasso explained 32.7% of protein variation (R² = 0.327), 26.3% of dry matter (R² = 0.263), 22.8% of lactose (R² = 0.228), and 19.1% of fat (R² = 0.191). Spectral tone parameters (a*, Hue, and Chroma) were consistently retained as key predictors, whereas L* showed a limited contribution. SCC exhibited weak direct associations with color traits but was significantly related to electrical conductivity (p < 0.05), indicating inflammation-driven ionic changes rather than pigment effects. In classification analysis (SCC ≥ 200,000 cells/mL), the XGBoost model achieved 74% accuracy and an AUC of 0.69 in the independent test set, with Chroma and electrical conductivity identified as the most influential features. These findings suggest that, among the evaluated color variables, Chroma provided the most relevant information for discriminating SCC status, whereas the overall contribution of milk color traits to compositional prediction remained moderate. Therefore, color-derived measurements should be interpreted as instrument-based optical indicators that may complement, but not replace, conventional milk quality assessments. Full article

Decellularized extracellular matrix (dECM) scaffolds derived from xenogeneic tissues represent promising biomaterials for tissue engineering. In this study, dECM scaffolds were developed and characterized from four ovine tissues—skin, tunica vaginalis, fascia lata, and pericardium—using a detergent-based decellularization protocol to evaluate decellularization efficiency and extracellular matrix (ECM) preservation. Decellularization was performed using a sequential detergent-based protocol with sodium dodecyl sulfate and Triton X-100. Decellularization efficacy and matrix preservation were evaluated through gross examination, histological analysis, scanning electron microscopy (SEM), and residual DNA quantification. Gross inspection revealed increased translucency and reduced pigmentation in decellularized tissues compared with native counterparts, indicating effective cellular removal while maintaining overall tissue architecture. Histological assessment confirmed the complete absence of nuclear and cytoplasmic material, alongside preservation of collagen-rich extracellular matrix organization. SEM analysis demonstrated well-maintained ultrastructural features, including aligned collagen fibers and porous ECM architecture, with complete removal of epithelial and stromal cellular elements. Quantitative analysis revealed approximately 94% reduction in residual DNA content across all decellularized tissues compared with native controls. This study demonstrated that the employed detergent-based protocol reliably produces structurally preserved, acellular scaffolds from multiple ovine tissues. The resulting biomaterials exhibit structural characteristics that support their potential use in tissue engineering applications, pending further functional validation. Full article

This work presents the first in-depth investigation of Theodor Aman’s paintings that focuses on three of his heritage artworks: “Hora de peste Olt” (1866), “Teleleice în Harem” (1879), and “Regimul vechi” (1881), and that relies on both elemental and spectroscopic analytical techniques. Non-destructive Raman spectroscopy was employed on all three works of art to identify the pigments used by the Romanian master. In addition, micro-samples were available from “Hora de peste Olt” and “Teleleice în Harem”, which were further analyzed using XRD, micro-Raman, ATR-FTIR, and SEM-EDS techniques to provide complementary information on the pigments. SEM-EDS was also applied to study the structure of the preparation layers. The analyses revealed significant differences between the artworks in terms of both the pigments employed and the preparation of the canvas, suggesting that the earlier artwork belongs to one creative phase, while the newer pieces can be attributed to a later phase in the artist’s career. Full article

Resin 3D-printed molds are being increasingly favored for PDMS microfluidics across many disciplines. However, resin diversity, as well as secret manufacturer formulations, leads to a lack of standardization when using 3D printing for microscale applications. The impact of physical resin properties, both in its monomeric concoction and polymerized lattices at 100 µm or lower scales, needs quantification. We tested the performance of locally available resin formulations, isolating the impact of resin pigments and how it impacted the resin’s properties and performance. Lower resin viscosity improved feature fidelity (edge filleting < 25 µm) and improved resolution limit for recessed features, while cured polymer mechanical strength impacted the limit for positive mold features. We combined our findings to fabricate quality negative and positive mold structures in the mold and determined the best protocols associated with limitations during the fabrication of such structures. The methodologies in this study are expected to be widely applicable across various resin types and simplify the adoption of 3D printing protocols for specific feature fabrication in microscale molds for PDMS devices. Full article

The seedlings of the young Atlas cedar (Cedrus atlantica Manetti) are very important for the regeneration and restoration of forest populations of this endemic species, which inhabits a very fragmented area in the highest mountains of North Africa (Algeria and Morocco). There is very minimal information on the diseases that are afflicting these young plants. In this work, Alternaria strains CHP2, S4.2, and SP1.1 were isolated from different plants and subjected to identification and pathogenicity testing. The infected plants developed clear symptoms of light brown disease spots on the leaves with a yellowish or chlorotic halo around them, which gradually developed to a yellowing of the plantlets and their complete drying. Some spots merged to form large areas of necrosis which covered an average of 80% of the plantlets. The impact of the infection on plant physiology was determined using measurements of photosynthetic pigments, which showed reductions of 46.28% in chlorophyll and 59.90% in carotenoids in strains SP1.1 and CHP2, respectively. Molecular characterization of the ITS region of the isolates revealed that strains CHP2 and S4.2 showed high sequence similarity to reference sequences of Alternaria spp., including taxa related to A. destruens and A. murispora, although species-level identification remains tentative. These findings highlight the growing relevance of fungal pathogens in forest regeneration under global climate change. By revealing the pathogenic role of Alternaria species, this study contributes to sustainable forest management and conservation strategies in changing environments. Full article

Prominin-1 (Prom1/CD133) has long been recognized as a structural determinant of photoreceptor outer segment (OS) morphogenesis, yet rapidly accumulating evidence extends its role to retinal pigment epithelium (RPE) homeostasis, encompassing autophagy–lysosomal flux, outer segment phagocytosis, mitochondrial function, and regulation of inflammatory stress. This review synthesizes mechanistic and transcriptomic insights that position PROM1 as a central regulator of photoreceptor and RPE integrity, reframing Prom1 disease as a multi-compartment retinal disorder relevant to both inherited retinal dystrophies (IRDs) and atrophic age-related macular degeneration (aAMD). We develop a dual-axis conceptual model in which Prom1 dysfunction can initiate pathology in either the photoreceptors (OS morphogenesis failure) or the RPE, including impaired autophagic flux, lysosomal activity, defective phagocytosis, and Epithelial-Mesenchymal Transition (EMT)-like de-differentiation, with secondary cross-compartmental degeneration. Clinically, autosomal-dominant missense variants associate with macular or cone-rod dystrophy, whereas biallelic truncating/splice-site mutations drive early-onset rod–cone disease and panretinal/RPE atrophy, illustrating genotype–phenotype diversity. By integrating recent high-resolution transcriptomic data from Prom1-deficient RPE cells with long-standing insights into photoreceptor biology, we highlight converging pathways of degeneration that challenge a photoreceptor-centric view and unify disparate phenotypes within a single molecular framework. These insights broaden the therapeutic landscape, advancing gene augmentation and pathway-targeted strategies to preserve RPE integrity, sustain photoreceptor function, and modify disease course in PROM1-associated IRDs and atrophic AMD. Full article

Purpose: Neuroinflammation and oxidative stress are increasingly recognized as central, interconnected drivers of neurodegeneration in the visual system. This review examines the pathogenic mechanisms shared across glaucoma, age-related macular degeneration (AMD), diabetic retinopathy (DR), and Alzheimer’s disease (AD), and evaluates the therapeutic rationale for targeting both pathways simultaneously. Methods: A narrative review of peer-reviewed literature was conducted using PubMed. Searches included the following MeSH terms: neuroinflammation, oxidative stress, retinal neurodegeneration, microglia, Müller glia, mitochondrial dysfunction, glaucoma, age-related macular degeneration, diabetic retinopathy, and Alzheimer’s disease. Priority was given to original research, systematic reviews, and high-impact publications from 2000 through 2025. However, seminal foundational works were included regardless of publication date. Studies were selected based on relevance to glial activation, mitochondrial dysfunction, reactive oxygen and nitrogen species, and disease-specific neuronal outcomes. Results: Across all four diseases, persistent microglial and Müller glial activation, mitochondrial electron transport chain dysfunction, and excess reactive oxygen species (ROS) and reactive nitrogen species (RNS) production form a self-amplifying feed-forward loop that accelerates neuronal injury. In glaucoma, these mechanisms drive intraocular pressure-independent retinal ganglion cell loss. In AMD and DR, lipid dysregulation, complement activation, and chronic hyperglycemia sustain oxidative-inflammatory injury to the retinal pigment epithelium, photoreceptors, and neurovasculature. In AD, retinal amyloid deposition and oxidative burden mirror cortical pathology, positioning the retina as a noninvasive biomarker site. Conclusions: Neuroinflammation and oxidative stress constitute unifying upstream mechanisms across major vision-threatening neurodegenerative diseases. Combination therapeutic strategies that simultaneously modulate glial activation and restore redox homeostasis may offer superior neuroprotective efficacy compared to approaches targeting isolated downstream mediators. Full article

The lack of the literature data on the actual CO₂ assimilation and dissimilation in aquatic plants under conditions of high chromium concentrations prompted this study to determine the efficiency of the photosynthetic apparatus and the actual rates of photosynthesis and respiration in Callitriche cophocarpa plants under chromium stress conditions. We hypothesized that C. cophocarpa would need to display an efficient acclimation mechanism that allows for efficient carboxylation and dark respiration in the presence of Cr(VI) ions. Shoots of C. cophocarpa plants were cultured in the control medium (Cr-free) and in the medium with addition of 0.1 mM potassium chromate. Results revealed that young and mature organs of examined plants respond differently to Cr(VI) ions. In young leaves, the decrease in pigment content (in comparison to control, car, chl a, total chl, and chl b by 15, 38, 39, and 49%, respectively) and distorted chloroplast ultrastructure led to lower efficiency of photosynthesis (by 22.5% compared to control). These leaves also exhibited reduced dark respiration efficiency (by 36.2% compared to control). In turn, mature leaves exhibited no change in photosynthesis and respiration efficiency. C. cophocarpa withstands Cr toxicity due to acclimation strategies associated with the reduction in the size of photosynthetic antennas and the effective use of reduced amounts of incoming radiation, as well as efficient dark respiration in mature leaves. Full article

Fruit anthocyanins are primary determinants of color, sensory quality, and nutritional value in grapes; however, their endogenous biosynthesis is governed by complex interactions among genetic, environmental, agronomic, and postharvest factors. This review elaborates recent advances in physiology and molecular biology to clarify the biosynthetic mechanisms in grapes, including the coordinated action of structural enzymes, MYB–bHLH–WD40 regulatory complexes, hormone-mediated signaling pathways, and vacuolar transport processes. Key environmental factors, such as temperature fluctuations, light exposure, water availability, and soil properties, regulate these networks, contributing to significant variation in pigmentation profiles across cultivars and growing regions. Strategic agronomic practices, including canopy management, regulated deficit irrigation, balanced nutrient management, and temperature-mitigation techniques, further influence pigmentation by modifying the microclimate of the fruit zone during development. Based on these mechanistic insights, this review evaluates targeted strategies for enhancing anthocyanin accumulation, highlighting recent progress in genetic improvement through CRISPR/Cas genome editing, transgenic approaches, and marker-assisted selection (MAS), which enable precise modulation of biosynthetic and regulatory genes. Complementary postharvest interventions, such as optimized cold storage, modified-atmosphere packaging, hormonal elicitors, and controlled oxidative technologies, provide additional opportunities to maintain or enhance pigment stability after harvest. Collectively, these advances establish a comprehensive framework linking molecular regulation with practical vineyard, breeding, and postharvest strategies, offering an integrated pathway to improve anthocyanin consistency, berry quality, and the phenolic characteristics of grape-derived products. Full article

Throughout this study, the short-term stability of methanol extracts was evaluated in cases of 15 distinctive, antioxidant-rich plant materials over 3, 7, and 14 days under refrigeration (4 °C), dark room-temperature, and light-exposed room-temperature conditions. A great variability in the matrix-dependent stability of the antioxidants, as well as the pronounced impact of the implied storage conditions on their plausible degradation, was revealed and featured. Initial total polyphenol content (TPC) ranged from 50.50 ± 0.44 mg gallic acid (GAE)/g DW (rosemary) to only 0.02 ± 0.006 mg GAE/g DW (amaranth). After 14 days, pigment-rich vegetable extracts (basil, beetroot powder, spinach powder, dried onion, tomato powder, and yarrow tail) lost 86.2–89.2% of TPC and 80–99% of DPPH (2,2-diphenyl-1-picrylhydrazyl) activity across all conditions, even under refrigeration. In contrast, for Lamiaceae species, markedly higher levels of the referred parameters were to be observed after 14-day-long storage. Decrease in TPC values was found to be 43.7% (rosemary), 50.6% (thyme), and 42.9% (oregano), respectively, while DPPH values were reduced by only 17–29%. Turmeric and walnut flour showed intermediate stability. Refrigeration consistently minimized the degradation of antioxidants (e.g., rosemary’s decrease in DPPH was only 20.3% at 4 °C vs. >70% under ambient conditions), while light exposure significantly accelerated losses of antioxidants in nearly all samples. Methanol extracts of many dietary plants, particularly pigment-rich ones, exhibit rapid and pronounced changes during short-term storage. Comparison with values obtained immediately after extraction shows that even brief storage can lead to substantial deviations. Although the current sampling intervals do not capture changes within the first hours, the results clearly indicate the need to minimize delays and standardize analytical timing to avoid underestimating phenolic content and antioxidant capacity. Moreover, these findings demonstrate that measured antioxidant properties are not solely inherent to the plant material but are strongly influenced by the extract matrix and methodological conditions. Consequently, antioxidant data should be regarded as matrix- and protocol-dependent, with important implications for their interpretation, comparability, and reproducibility across studies. Full article

Grape pomace represents a widely available agro-industrial by-product in Chile with considerable potential for valorization within circular economy frameworks; however, its functionality as a cosmetic ingredient depends on both grape cultivar and processing strategy. In this study, the direct incorporation of solid grape pomace residues into cream formulations was first evaluated, revealing limitations related to color control, homogeneity, and sensory performance. Subsequently, the influence of varietal origin (Malbec, Merlot, Syrah, and Grenache) on the extraction, stability, color behavior, and functional performance of anthocyanin-rich extracts was investigated for cosmetic applications. pH-standardized color analysis revealed statistically significant (p < 0.05) varietal differences, with Malbec extracts showing superior chromatic stability under acidic and near-neutral conditions, exhibiting lower reduction in a* values across the pH range compared to other varieties. In contrast, Syrah, Grenache, and Merlot showed a more pronounced decrease in red chromaticity, indicating higher sensitivity to pH-induced structural transformations. Although Merlot and Syrah exhibited higher ABTS antioxidant activity, Malbec presented the highest total phenolic content and the most balanced functional profile when considering both stability and color retention. Incorporation of anthocyanin-rich extracts into cosmetic cream formulations demonstrated that a 4.5% (m/v) loading ensured a skin-compatible pH (4.5–5.5), with Malbec-based creams exhibiting superior color stability and formulation performance over time. These findings demonstrate that grape pomace valorization requires variety-specific evaluation and identify extraction as a key enabling step for the development of sustainable, bio-based color-functional cosmetic ingredients. Full article