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  • Bettersizer 2600

    Functional redundancy as an indicator for evaluating functional diversity of macrobenthos under the mussel raft farm near Gouqi Island

    DOI: 10.1016/j.aquaculture.2023.740024 Read Article Go logo
    Zhejiang Ocean University | 2024
    Biological traits analysis (BTA) helps to evaluate the effects of different environmental variables on the traits-based functional composition of macrobenthos. However, research on functional traits of macrobenthos under mussel farming is limited. We investigated the spatial and temporal response of the benthic system in terms of taxonomic and functional diversity to environmental variables of farming and natural stressors resulting from suspended mussel farming near Gouqi Island of eastern China Sea. The functional traits of macrobenthic assemblages under mussel farming were characterized by “medium adult body size”, “vermiform body form”, “high flexibility”, “infauna”, “semi-motile”, “gonochoristic”, “surface deposit-feeders”, “carnivores”, “semi-motile burrowers”, and “tube-dwellers”. Functional redundancy was stable in response to mussel farming stresses among seasons, whereas species diversity showed efficient to evaluate natural variables. Functional diversity was significantly affected by farming stressors rather than natural variables, Further analysis using multivariate methods together with continuous monitoring were highlighted to evaluate the impacts of mussel farming. Our results reinforce the importance of macrobenthic species and functional traits analysis to evaluate human stresses driven impacts in offshore ecosystems. By analysing the environmental variables with different sources, independently, we concluded the main effects of human pressures on macrobenthic community. Such distinction could be particularly effective to isolate variable environmental descriptors and evaluate their effects on functional diversity, making the current approach promising for the evaluation of ecological effects of anthropogenic stressors in aquaculture areas.
  • Bettersizer 2600

    Degradation characteristics and utilization strategies of a covalent bonded resin-based solid amine during capturing CO2 from flue gas

    DOI: 10.1016/j.seppur.2023.125621 Read Article Go logo
    China University of Petroleum | 2024

    In this study, various types of degradation as well as attrition which are possibly encountered in a circulating fluidized bed temperature swing adsorption (CFB-TSA) process, were conducted experimentally to evaluate the stability of a resin-based solid amine sorbent. Other characterizations methods, such as elemental analysis (EA), Fourier transform infrared spectroscopy (FTIR) etc. were applied to further reveal the degradation mechanisms. The results showed that thermal degradation occurs from 140–160 °C due to the decomposition of amine group. The CO2-induced degradation occurs from a higher temperature of 160–180 °C accompanied by the production of urea. Hydrothermal stability is good below 130 °C, but the ionic impurities in steam crystalized on particle surface can accelerate the degradation. Oxidative degradation is the most harmful, which starts at a lower temperature of 70–80 °C with the formation of aldehyde. The existence of H2O in atmosphere can alleviate the oxidative and CO2-induced degradations. The employed sorbent has a very low attrition index of 0.05, which is 1–2 orders lower than typical commercial fluidized bed catalysts. Based on the results of stability evaluation, some design suggestions for proper utilization of this sorbent or other similar resin-based sorbents have been provided in an industrial CFB-TSA process.

  • Bettersizer 2600

    De-branching of starch molecules enhanced the complexation with chitosan and its potential utilization for delivering hydrophobic compounds

    DOI: 10.1016/j.foodhyd.2023.109498 Read Article Go logo
    Shihezi University | 2024
    The current study aimed to prepare the complexes between debranched-waxy corn starch and chitosan polymers (DBS-CS), and then investigated their corresponding structural characteristics, rheological property and potent application in Pickering emulsion. The results indicated that the existence of chitosan significantly inhibited starch short-range molecular rearrangement for all DBS-CS samples, which was manipulated by both debranching treatment and chitosan content. Interestingly, this is the first study to reveal that the outstanding peak at 1.8 ppm in 1H NMR spectrum for sample DBS-CS was gradually shifted towards a lower-field region following an increased chitosan content. Moreover, the debranching treatment shifted the crystallinity pattern from A-type to B-type and the relative crystallinity of DBS-CS decreased gradually with the increased content of CS. All samples had a pseudoplastic fluid and shear-thinning behavior with an enhanced shear resistance following the complexation. The DBS-CS was applied in a Pickering emulsion for showing a greater emulsifying stability and a lower gel strength than native NS-CS prepared emulsion. Importantly, the encapsulation ability of curcumin in the DBS-CS emulsion was significantly improved, followed by an increase of 15.45% for its corresponding bioavailability compared to the control. Therefore, this study might highlight a potential carrier for delivering the bioactive substances in a green pattern.
  • Bettersizer 2600

    Heat-induced aggregation behavior of wheat gluten after adding citrus pectin with different esterification degree

    DOI: 10.1016/j.foodhyd.2023.109420 Read Article Go logo
    Gansu Agricultural University | 2024
    Wheat gluten aggregation during heat treatment is beneficial to the final quality of gluten-based products. Exogenous pectin can affect gluten aggregation. However, the effect of pectin with different degrees of esterification on the heat-induced aggregation behavior of gluten and its possible mechanism are still unclear. Thus, the heat-induced aggregation behavior of gluten after adding pectin with different esterification degree was studied in this study. When the temperature was raised from 25 °C to 95 °C, pectin affected gluten aggregation and was related to the degree of esterification. Specifically, the results of rheological properties and particle size indicated that low-ester pectin improved the viscoelasticity of gluten and promoted gluten aggregation. Thermal properties revealed that enthalpy of gluten added with low-ester pectin (37%) increased from 92.96 J/g to 95.40 J/g during heating process. Structurally, the fluorescence intensity and surface hydrophobicity of gluten added with low-ester pectin (37%) were lower than those added with high-ester pectin (73%). In addition, low-ester pectin (37%) significantly increased the disulfide bond content (from 15.31 μmol/g to 18.06 μmol/g) and maintained β-sheet content of gluten compared with gluten alone at 95 °C, indicating that low-ester pectin was more likely to induce gluten aggregation. However, scanning electron microscope showed that the gluten added with low-ester pectin (46%) exhibited a denser network structure at 95 °C than that added with low-ester pectin (37%). These results will provide a theoretical base for the regulation of gluten aggregation and the quality of gluten-based products by pectin with different esterification degree.
  • Bettersizer 2600

    Effect of pH on the formation mechanisms, emulsifying properties and curcumin encapsulation of oat protein isolate–high methoxy pectin complexes

    DOI: 10.1016/j.foodhyd.2023.109454 Read Article Go logo
    Tianjin University of Science & Technology | 2024
    Oat protein isolate (OPI) has high nutritional value but poor emulsifying properties. The purpose of modifying the OPI with high methoxyl pectin (HMP) was to improve emulsification. In this work, an oat protein isolate (OPI)–high methoxyl pectin (HMP) complex was constructed by changing the pH, and the interactions, formation mechanism and potential use of the OPI–HMP complex as a food emulsifier were explored. The presence of HMP caused structural changes in the OPI, and the changes were pH dependent. When the OPI to HMP mass ratio was 3:1, the critical pH for the phase behavior of OPI–HMP was 5.0. When the pH was greater than 5.0, the OPI and HMP were codissolved in the composite system mainly through electrostatic repulsion. When the pH was 5.0, a soluble OPI–HMP complex was formed by a combination of electrostatic attractions, hydrophobic interactions and hydrogen bonding. At pH values below 5.0, other aggregates of HMP and OPI were generated through electrostatic attraction and hydrogen bonding and formed insoluble aggregates. When the OPI to HMP mass ratio was 3:1 and the pH was 5.0, the particle sizes of the emulsion were the smallest at 8.75 μm due to the strong electrostatic interactions. The emulsification activity and stability were much higher than those of the OPI, and they formed dense osmotic networks, which protected the curcumin. The rates for curcumin encapsulation and retention reached 83.87 ± 1.50% and 88.70 ± 2.50%, respectively, and the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging rate was maintained at a high level (approximately 72%). These results confirmed the possibility of using the OPI-HMP complex emulsions as excellent and stable nutraceutical delivery systems for lipid soluble bioactive compounds in food and biomedical applications.
  • Bettersizer 2600

    Tunable rheological properties of high internal phase emulsions stabilized by phosphorylated walnut protein/pectin complexes: The effects of pH conditions, mass ratios, and concentrations

    DOI: 10.1016/j.foodres.2023.113670 Read Article Go logo
    Xihua University | 2024
    The current study reported high internal phase emulsions (HIPEs) stabilized by phosphorylated walnut protein/pectin complexes (PWPI/Pec) and elucidated how their rheological properties were modulated by pH conditions, mass ratios, and concentrations of the complexes. At pH 3.0, the HIPEs stabilized by PWPI/Pec exhibited smaller oil droplet sizes, as well as higher storage modulus (G') and flow stress, in comparison to those stabilized by the complexes formed at pH 4.0–6.0. These observations can be directly linked to pH-dependent changes in particle size, surface hydrophobicity, and wettability of the PWPI/Pec complexes. Rheological analysis revealed that all generated HIPEs displayed weak strain overshoot behavior, irrespective of pH conditions. Notably, HIPEs stabilized by PWPI/Pec at mass ratios of 2:1 and 4:1 showed enlarged oil droplet sizes, lower G' and flow stress but higher flow strain with unaffected loss factor compared to those stabilized by PWPI/Pec 1:1. However, reducing the concentration of PWPI/Pec led to a simultaneous decrease in G', flow stress, and flow strain, along with a significant increase in the loss factor of the HIPEs. Furthermore, the HIPEs formed with 1% PWPI/Pec 1:1 at pH 3.0 demonstrated excellent stability against heat treatment and long-term storage. These results provide valuable insights into the modulation of rheological characteristics of HIPEs and offer guidance for the application of walnut protein-based stabilizers in HIPE systems.
  • Bettersizer 2600

    pH-dependent synthesis of CeO2-ZnO nanocomposite for enhanced environmental remediation of endosulfan and dimethoate pesticides

    DOI: 10.1016/j.molstruc.2023.137174 Read Article Go logo
    Minhaj University Lahore | 2024

    This research aims to tackle significant challenges related to the synthesis and utilization of advanced nanocomposite materials in environmental remediation, specifically focusing on pesticide degradation. The synthesis of CeO2-ZnO nanocomposites employs both co-precipitation and hydrothermal methods, with the inclusion of the zwitterionic surfactant (SB-12) as a surface modifier. The modulation of pH levels during the synthesis of CeO2-ZnO nanocomposites allows for the optimization of crucial reaction parameters. Notably, it is observed that nanocomposites prepared at pH 9 exhibit the smallest average particle size. To comprehensively characterize these prepared nanocomposites, various analytical techniques such as FTIR, XRD, DR-UV/Vis, TEM/EDS, and Nano particle size analysis are employed. The FTIR results reveal a reduced presence of impurities at higher pH levels. Notably, the CeO2-ZnO nanocomposites synthesized via the hydrothermal method at pH 9 exhibit polyhedral nanostructures. The research's significant contribution lies in the practical application of these nanocomposites for the degradation of highly toxic and persistent organochlorine and organophosphorus pesticides, particularly Endosulfan and Dimethoate. These nanoparticles demonstrate remarkable pesticide degradation capabilities, with a particular emphasis on their high effectiveness against Endosulfan. The potential implications of this work extend to areas such as environmental protection, sustainable agriculture, and the remediation of pesticide-contaminated ecosystems.

  • BeNano 180

    Wetting and deposition behaviors of pesticide droplets with different dilution ratios on wheat leaves infected by pathogens

    DOI: 10.1016/j.molliq.2022.120977 Read Article Go logo
    Chinese Academy of Agricultural Sciences | 2023
    The pesticide formulations should be diluted to different concentrations according to selected application methods. The structure and properties of crop leaf surfaces can undergo severe changes after infestation with pests or diseases. Previous studies have mostly focused on the interfacial behaviors of pesticide droplets on healthy plant leaves. Here, we prepared 25 % pyraclostrobin microemulsion and diluted it according to different dilution ratios corresponding to low volume and conventional volume spray methods. The dynamic wetting and deposition behaviors of pesticide solution on wheat leaves infected with powdery mildew were investigated. The surface structure and properties of wheat leaves covered by the fungus Blumeria graminis will be changed. Conidia produce more non-polar components. The droplets with low dilution were more likely to deposit and reach the Wenzel state on wheat powdery mildew leaves. However, the droplets with high dilution were difficult to wet and easy to break and rebound from leaf surfaces. This research guides the control of wheat powdery mildew with pesticides under different application methods and the interface interaction between pesticide droplets and hydrophobic leaf surfaces infected by pathogens.
  • BeNano 180 Zeta

    Gallium-doped MXene/cellulose nanofiber composite membranes with electro/photo thermal conversion property for high performance electromagnetic interference shielding

    DOI: 10.1016/j.cej.2023.142565 Read Article Go logo
    Huazhong University of Science and Technology | 2023
    With the rapid development of science and technology, information security and multiscenario applications of electronic equipment have received increasing attention in recent years. Therefore, the design and development of multifunctional electromagnetic interference shielding materials are key to solving the current development needs of electronic equipment. Based on the above topics, multifunctional liquid metal gallium (Ga)-doped transition metal carbides/nitrides (MXenes)/cellulose nanofiber (CNF/MXene@Ga, CMG) composite membranes with a nacre-like “brick–mortar” layered structure were synthesized using an ultrasonic probe and vacuum-assisted filtration. By optimizing the design, the CMG composite membranes could achieve a tensile strength of 36.12 MPa with good flexibility and could achieve a maximum thermal conductivity of approximately 9.11 W/m·K. The heterogeneous interface between MXenes and Ga nanoparticles and the intercalation of Ga nanoparticles significantly influenced the composite membranes for the absorption of electromagnetic waves, which yielded a specific shielding effectiveness per unit volume (SSE/t) of 6444.1 dB·cm2·g−1; this value is over the vast majority reported in the current literature. Further studies confirmed that the CMG composite membranes possessed excellent electrothermal and photothermal conversion functions. The electrothermal conversion agreed with Joule's law. Moreover, the phase transition behavior of Ga also imparts the membranes with the ability to store heat. The photothermal conversion ability was attributed to the surface plasmon resonance effect of Ga. Therefore, this work provides material support for the information security and multi-scenario applications of electronic equipment.
  • BeNano 180 Zeta Pro

    Applying dynamic light scattering to investigate the self-assembly process of DNA nanostructures

    DOI: 10.1016/j.cclet.2023.108384 Read Article Go logo
    University of Chinese Academy of Sciences | 2023
    Understanding the dynamic assembly process of DNA nanostructures is important for developing novel strategy to design and construct functional devices. In this work, temperature-controlled dynamic light scattering (DLS) strategy has been applied to study the global assembly process of DNA origami and DNA bricks. Through the temperature dependent size and intensity profiles, the self-assembly process of various DNA nanostructures with different morphologies have been well-studied and the temperature transition ranges could be observed. Taking advantage of the DLS information, rapid preparation of the DNA origami and the brick assembly has been realized through a constant temperature annealing. Our results demonstrate that the DLS-based strategy provides a convenient and robust tool to study the dynamic process of forming hieratical DNA structures, which will benefit understanding the mechanism of self-assembly of DNA nanostructures.
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