Volume 20 Issue 4

The combined effects of temperature, Fe (III) contents, NH₄⁺-N contents, and soil-liquid ratio were evaluated relative to the loss of NH₄⁺-N in soils using a response surface methodology (RSM). The microbial mechanisms were explored for nitrogen transformation by quantifying functional genes related to nitrification and denitrification. According to parameter optimization analysis for prediction equation, the maximum NH₄⁺-N loss was 86.1% under the conditions of 17.0 °C, 0.772 g·kg^-1 Fe (III), 21.9 mg·kg⁻¹ NH₄⁺-N, and soil: liquid ratio of 1:1. The prediction result was similar to experimental data in the current study, which the NH₄⁺-N loss was 83.2% under the condition of 25 °C, 0.723 g·kg^-1 Fe (III), 20 mg·kg⁻¹ NH₄⁺-N, and soil-liquid ratio of 1:1. While the N₂O flux reached its minimum value of 8.35 μg·m⁻²·h^–¹ under the experimental conditions, correlating with gene copy numbers for ammonia-oxidizing bacteria ammonia monooxygenase subunit A gene (AOB-amoA), and nitrite reductase genes (nirK) were maximum values of 4.5×10⁵ and 4.8×10⁵ copies·g^-1, respectively. NH₄⁺-N loss resulted from multiple interacting processes beyond ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) mediated oxidation. The research findings can provide insights for reducing nitrogen application to avoid NH₄⁺ toxicity and increasing soil planting suitability.

Environmentally friendly and biodegradable polyvinyl alcohol (PVOH) film combined with Phellodendron amurense extract was used to prepare an anti-UV composite film through thermal flow molding technology. The prepared PVOH composite film containing Phellodendron amurense extract exhibited UV-resistant properties, with the composite film made from leaf extract showing the highest UV resistance. Additionally, the tensile strength and toughness of the PVOH composite film with added Phellodendron amurense extract significantly increased compared to pure PVOH film. Studies on film-forming and UV-resistant mechanisms have revealed that extract particles can act as nucleating agents to promote the local ordered arrangement of PVOH molecular chains, forming microcrystalline regions. This enhances the tensile strength of composite films while maintaining their toughness. During the film-forming process, the extract forms hydrogen bonds with PVOH, and the benzene ring conjugated double bonds in the extract can absorb ultraviolet light, contributing to the UV resistance of the PVOH composite film. The composite film prepared from Phellodendron amurense extract and PVOH with UV resistance and high strength can be applied in fields such as packaging, food, and sunscreen products, which is of great significance for promoting the efficient development and utilization of biomass resources.

Bacterial cellulose (BC) is an emerging biopolymer synthesized by specific microbial strains, such as Komagataeibacter xylinus. It is distinguished by its ultrafine nanofibrillar architecture, exceptional mechanical strength, high water-holding capacity, and inherent biocompatibility. Unlike plant-derived cellulose, BC is chemically pure and free from lignin and hemicellulose, making it especially attractive for biomedical use. Recently, BC has gained prominence as a multifunctional platform for applications in wound care, antimicrobial therapies, tissue engineering, and sustainable infection control. Recent advances in bioengineering and materials science have significantly broadened the functional landscape of BC. Through incorporating antibacterial agents, such as silver nanoparticles, chitosan, essential oils, or antibiotics, BC composites demonstrate potent antimicrobial efficacy while maintaining safety and biocompatibility. These hybrid materials address the critical need for novel, biodegradable alternatives to synthetic polymers in the fight against antibiotic-resistant pathogens. This brief review critically examines the latest progress in BC production technologies, structural functionalization strategies, and clinical applications, with particular emphasis on its antibacterial properties and regenerative potential. The molecular mechanisms underlying its interaction with microbial cells and host tissues are also explored. Furthermore, the review outlines key challenges, such as large-scale manufacturing, regulatory hurdles, and clinical validation, and presents forward-looking perspectives on how BC could revolutionize healthcare by supporting next-generation biomaterials and sustainable therapeutic solutions.

The increasing global demand for sustainable materials has spurred extensive research into biopolymer-based composites derived from agricultural residue biomass. These materials offer an eco-friendly alternative to petroleum-based composites, addressing environmental pollution, resource depletion, and the need for low-density materials in sectors such as automotive, aerospace, packaging, and construction. This research focused on low-density bio-based composites as sustainable options for lightweight applications in automotive, aerospace, packaging, and construction. It highlights the use of agricultural residue and discontinuous binder systems to reduce density, as well as manufacturing techniques that improve structural efficiency. It emphasizes critical composite properties such as mechanical strength, thermal behavior, water resistance, biodegradability, and lightweight characteristics. The influence of fiber content and processing parameters on overall performance is also discussed. In addition, the review highlights major challenges, including scalability, cost-effectiveness, and long-term stability and proposes future research directions focused on durability enhancement, production efficiency, and commercial viability. Overall, this work underscores the transformative potential of agricultural residue-derived bio composites in advancing sustainable, high-performance materials for lightweight and eco-conscious construction and industrial applications.

This study showcases the characterization of a surface modified polyvinylidene fluoride (PVDF) hollow fiber membrane via Cellulose/PVDF coating. Scanning electron microscopy shows evidence of Cellulose/PVDF coating where surface roughness and coating lines with cracking is visible. The rough surface correlates with an improved pure water flux. However, the presence of surface cracks and higher cellulose loading results in decreased flux. Fourier transform infrared spectroscopy shows evidence of cellulose on the coated membrane. X-Ray diffraction revealed amorphous phase on the surface of the coated membrane, indicating that coated membrane has improved hydrophilic properties. The coated membrane samples have improved pure water flux performance up to 3 times the value from control (157.8864 L/m²/h/bar) for samples P01 (432.9142 L/m²/h/bar) and P02 (483.8453 L/m²/h/bar) which is the best performing membrane. The porosity and mean pore size correlate with the pure water flux as increase in porosity with increased mean pore size enables better permeability. However, the increased porosity with decreased mean pore size causes a clogging effect which may be attributed to the swelling of the membrane when in contact with the pure water. Overall, the cellulose/PVDF coating modifies the surface properties by developing a rough and porous hydrophilic layer. It enables better performance for the hydrophobic PVDF hollow fiber membrane.

Being in an urban or developed area can adversely affect human well-being. On the other hand, human well-being is supported by recreational activities, which are often carried out outside, particularly in natural areas. Most research on such topics has focused on non-urban/non-developed areas, for which the term ecosystem services describes the direct and indirect benefits that people may receive. In developed regions, limited access to natural features can hinder these benefits. This study explored the specific case of a tree-walking route located within a developed campus in the US. This route is noteworthy for its diverse collection of 40 distinct woody species, which contributes to the campus’s green infrastructure. Two on-site observations were carried out to visually document the trees on the route and to understanding ecological value. An AI-based mobile application, ‘Picture This’, was used to follow the route as a self-guided participant. The results indicate that it is possible to use the application as a guide with approximately 84% accuracy. Its accessibility enhances its potential as a free resource for researchers, students, and nature enthusiasts.

A key challenge for the paper industry in adopting nanocellulose materials is finding the right balance between production costs and the benefits for specific paper grades, given the industry’s variety of products and processes. This study developed the first model to evaluate changes in steam consumption and other process parameters on a paper machine when incorporating lignin-containing micro- and nano-fibrillated cellulose (LMNFC) as a dry-strength additive, as well as its economic effects. Significant operational differences were observed in steam consumption, dissolved solids in the sewer stream, and production rates when implementing LMNFC in different scenarios. Using the assumption that reductions in basis weight frees up enough drying capacity to offset the additional drying requirements of LMNFC, this led to a 15% reduction in manufacturing costs while maintaining paper strength. A capital payback period of five years was estimated for LMNFC production, with a minimum selling price of $243 per ton. It is important to evaluate both process dynamics and dual cost metrics (cost per ton and cost per area), when analyzing the impact of LMNFC on linerboard production. While LMNFC increases the cost per ton, the lower cost per MSF underscores its material efficiency and economic benefits, particularly for lightweight grades.

Hemp fiber, as a renewable bio-based material, holds significant potential in the textile and paper industries. To unlock this potential, a critical step involves purification of the fibers. However, conventional degumming methods suffer from high energy consumption, severe fiber damage, and environmental pollution. This study evaluated a proposed one-step alkaline-hydrogen peroxide degumming process under mild conditions to achieve high-value utilization of hemp crops. Orthogonal experiments were conducted to optimize reaction conditions, including temperature, time, and liquid-to-solid ratio. Results showed that under optimal conditions (80°C, 4 h, 10:1 liquid-to-solid ratio), the residual gum content was 7.68% and fiber crystallinity increased by 8.33%. Additionally, the proportion of short fibers increased while coarse fibers decreased, yielding paper with a tensile index of 190 N/m and a whiteness of 70.3%. This low-temperature degumming process effectively removed gums while minimizing fiber damage, offering an eco-friendly and industrially viable solution for hemp fiber applications.

This study examined parental and children’s perceived value preferences regarding wooden toy materials to facilitate more efficient toy selection while evaluating whether fast-growing Paulownia wood can serve as a valuable alternative to high-consumption timber species to promote green toy adoption. The research employed three common wood types used in toys, furniture, and construction – ash, beech, and Paulownia – to fabricate experimental toy prototypes. Through on-site observations and questionnaires, parental preferences were documented across five dimensions: surface characteristics, price, usage cycle, environmental friendliness, and suitability. Results were analyzed using fuzzy theory for data recording, SPSS 27 for descriptive statistics, and fuzzy analytic hierarchy process for solution validation. Findings indicate that while Paulownia showed slightly weaker advantages in surface characteristics and modest benefits in usage cycle and suitability, it demonstrated significant advantages in price competitiveness and environmental performance, suggesting substantial potential for wider adoption.

Furniture design has undergone a significant transformation over the centuries, evolving from purely functional objects to artistic expressions that reflect societal values, technological advancements, and environmental concerns. In contemporary society, furniture design plays a critical role not only in shaping interior spaces but also in influencing lifestyle, culture, and sustainability. The modern emphasis on minimalism, ergonomics, and multifunctionality reflects changing living patterns, urbanization, and an increased focus on well-being. Technological innovations, such as digital fabrication and smart materials, have further expanded the possibilities of design, enabling more personalized and efficient solutions. Additionally, there is a growing consciousness around sustainable practices, leading to the use of eco-friendly materials and circular design principles. This evolution highlights the intersection of aesthetics, utility, and ethics in modern design. By examining key trends and innovations, this study explores how contemporary furniture design responds to the needs of a dynamic society and contributes to shaping the future of living environments.