The 2023 MDPI Annual Report has
been released!
 
46 pages, 34337 KiB  
Review
Sustainable Sensing with Paper Microfluidics: Applications in Health, Environment, and Food Safety
by Sanjay Kumar, Jyoti Bala Kaushal and Heow Pueh Lee
Biosensors 2024, 14(6), 300; https://doi.org/10.3390/bios14060300 (registering DOI) - 7 Jun 2024
Abstract
This manuscript offers a concise overview of paper microfluidics, emphasizing its sustainable sensing applications in healthcare, environmental monitoring, and food safety. Researchers have developed innovative sensing platforms for detecting pathogens, pollutants, and contaminants by leveraging the paper’s unique properties, such as biodegradability and [...] Read more.
This manuscript offers a concise overview of paper microfluidics, emphasizing its sustainable sensing applications in healthcare, environmental monitoring, and food safety. Researchers have developed innovative sensing platforms for detecting pathogens, pollutants, and contaminants by leveraging the paper’s unique properties, such as biodegradability and affordability. These portable, low-cost sensors facilitate rapid diagnostics and on-site analysis, making them invaluable tools for resource-limited settings. This review discusses the fabrication techniques, principles, and applications of paper microfluidics, showcasing its potential to address pressing challenges and enhance human health and environmental sustainability. Full article
(This article belongs to the Special Issue Microfluidics for Biomedical Applications (Volume II))
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26 pages, 2696 KiB  
Article
The Smell of Sustainability: Understanding Consumers’ Acceptability of Recycled Plastic Packaging with an Off-Odor
by Francesca Di Cicco, Maike Loos, Isa Vos, Rebecca Gibson, Yuvesveri Naidoo, Susan Gifford and Monique A. M. Smeets
Sustainability 2024, 16(12), 4896; https://doi.org/10.3390/su16124896 (registering DOI) - 7 Jun 2024
Abstract
This study investigates consumers’ acceptance and perceptions of post-consumer recycled (PCR) plastic packaging with an off-odor, and the effect of a sustainability claim thereupon. We utilized a mixed design to examine the influence of the percentage of PCR, packaging color, and the presence [...] Read more.
This study investigates consumers’ acceptance and perceptions of post-consumer recycled (PCR) plastic packaging with an off-odor, and the effect of a sustainability claim thereupon. We utilized a mixed design to examine the influence of the percentage of PCR, packaging color, and the presence of a sustainability claim on consumer perceptions. Participants were presented with vignettes describing a scenario involving the purchase of shampoo bottles with or without a sustainability claim and asked to smell and rate the odor qualities of the bottles, as well as their acceptability and willingness to buy. The study found a main effect of the percentage of PCR and color on acceptability and willingness to buy and a main effect of the percentage of PCR on the perceived odor properties. However, the presence of a sustainability claim did not significantly affect consumer perceptions. The findings provide valuable insights for stakeholders in the sustainable production and consumption sector and offer recommendations for future research to further explore the impact of sustainability claims in shaping consumer acceptance of sustainable packaging with suboptimal sensory properties. Full article
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Article
Influence of Cyclic Heat Treatment Temperature on Microstructure and Mechanical Properties of 18Ni(C250) Maraging Steel
by Kai Xiao, Shun Han, Zhixin Li, Ruming Geng, Gaoyang Han, Yong Li and Chunxu Wang
Materials 2024, 17(12), 2796; https://doi.org/10.3390/ma17122796 (registering DOI) - 7 Jun 2024
Abstract
Cyclic heat treatment is an effective approach for enhancing the mechanical properties of 18Ni(C250) maraging steel, and the selection of cyclic heat treatment temperature is a key factor. In this study, a cyclic heat treatment process with a two-step solution treatment is employed [...] Read more.
Cyclic heat treatment is an effective approach for enhancing the mechanical properties of 18Ni(C250) maraging steel, and the selection of cyclic heat treatment temperature is a key factor. In this study, a cyclic heat treatment process with a two-step solution treatment is employed to investigate the influence of cyclic heat treatment temperature, specifically the first solution treatment temperature (920 °C, 950 °C, and 980 °C), on the microstructure and mechanical properties of 18Ni(C250) maraging steel. The results indicate that with an increase in the cyclic heat treatment temperature, the average grain size of the 18Ni(C250) maraging steel decreases initially and then increases. When the cyclic heat treatment temperature reaches 950 °C, the grain size is at its minimum, exhibiting optimal grain uniformity. Additionally, the increase in cyclic heat treatment temperature results in a reduction in the size of martensitic lath with the same orientation inside the grains, along with an increase in the relative quantity of low-angle grain boundaries. Furthermore, the volume fraction and size of retained austenite show a monotonous increase with the rise in the temperature of the cyclic heat treatment, and the rate of increase becomes notably larger when the temperature is raised from 950 °C to 980 °C. Based on the observed microstructural changes, the variation in the mechanical properties of the 18Ni(C250) maraging steel was analyzed. Specifically, as the cyclic heat treatment temperature increases, the tensile strength of the 18Ni(C250) maraging steel initially increases and then stabilizes, while the elongation and fracture toughness exhibit a monotonic increase. Full article
Article
The Impact of the Combined Effect of Inhalation Anesthetics and Iron Dextran on Rats’ Systemic Toxicity
by Dyana Odeh, Nada Oršolić, Emanuela Adrović, Nina Bilandžić, Marija Sedak, Irena Žarković, Nikola Lesar and Vedran Balta
Int. J. Mol. Sci. 2024, 25(12), 6323; https://doi.org/10.3390/ijms25126323 (registering DOI) - 7 Jun 2024
Abstract
Disruption of any stage of iron homeostasis, including uptake, utilization, efflux, and storage, can cause progressive damage to peripheral organs. The health hazards associated with occupational exposure to inhalation anesthetics (IA) in combination with chronic iron overload are not well documented. This study [...] Read more.
Disruption of any stage of iron homeostasis, including uptake, utilization, efflux, and storage, can cause progressive damage to peripheral organs. The health hazards associated with occupational exposure to inhalation anesthetics (IA) in combination with chronic iron overload are not well documented. This study aimed to investigate changes in the concentration of essential metals in the peripheral organs of rats after iron overload in combination with IA. The aim was also to determine how iron overload in combination with IA affects tissue metal homeostasis, hepcidin–ferritin levels, and MMP levels according to physiological, functional, and tissue features. According to the obtained results, iron accumulation was most pronounced in the liver (19×), spleen (6.7×), lungs (3.1×), and kidneys (2.5×) compared to control. Iron accumulation is associated with elevated heavy metal levels and impaired essential metal concentrations due to oxidative stress (OS). Notably, the use of IA increases the iron overload toxicity, especially after Isoflurane exposure. The results show that the regulation of iron homeostasis is based on the interaction of hepcidin, ferritin, and other proteins regulated by inflammation, OS, free iron levels, erythropoiesis, and hypoxia. Long-term exposure to IA and iron leads to the development of numerous adaptation mechanisms in response to toxicity, OS, and inflammation. These adaptive mechanisms of iron regulation lead to the inhibition of MMP activity and reduction of oxidative stress, protecting the organism from possible damage. Full article
Article
Ultrasonic-Assisted Extraction and Gastrointestinal Digestion Characteristics of Polysaccharides Extracted from Mallotus oblongfolius
by Gansheng Tan, Zhouwei Duan, Guanghua Xia, Tian Xin, Ling Yang, Feng Liu and Hui Xie
Foods 2024, 13(12), 1799; https://doi.org/10.3390/foods13121799 (registering DOI) - 7 Jun 2024
Abstract
The polysaccharides were extracted from the leaves of Mallotus oblongifolius (MO) using an ultrasonic-assisted extraction method in this study. The main variables affecting the yield of polysaccharides extracted from Mallotus appallatus (MOPS) were identified and optimized while concurrently investigating its antioxidant capacity, hypoglycemic [...] Read more.
The polysaccharides were extracted from the leaves of Mallotus oblongifolius (MO) using an ultrasonic-assisted extraction method in this study. The main variables affecting the yield of polysaccharides extracted from Mallotus appallatus (MOPS) were identified and optimized while concurrently investigating its antioxidant capacity, hypoglycemic activity, and digestive properties. The results indicated that the optimal ultrasound-assisted extraction of MOPS involved an ultrasound power of 200 W, a liquid-to-solid ratio of 25:1 (mL:g), an extraction temperature of 75 °C, and an ultrasound time of 45 min, leading to an extraction yield of (7.36 ± 0.45)% (m/m). The MOPS extract exhibited significant scavenging activity against DPPH and ABTS radicals with IC50 values of (25.65 ± 0.53) μg/mL and (100.38 ± 0.38) μg/mL, respectively. Furthermore, it effectively inhibited the enzymatic activities of α-glucosidase and α-amylase with IC50 values of (2.27 ± 0.07) mg/mL and (0.57 ± 0.04) mg/mL, respectively. The content of MOPS remained relatively stable in the stomach and small intestine; however, their ability to scavenge DPPH radicals and ABTS radicals and exhibit reducing power was attenuated, and the inhibition of α-amylase and α-glucosidase activity was diminished. In conclusion, the ultrasonic extraction of MOPS showed feasibility and revealed antioxidant and hypoglycemic effects. However, the activities were significantly reduced after gastric and small intestinal digestion despite no significant change in the MOPS content. Full article
(This article belongs to the Section Food Engineering and Technology)
44 pages, 1582 KiB  
Review
An Extensive Analysis of Combined Processes for Landfill Leachate Treatment
by Ahmad Jamrah, Tharaa M. AL-Zghoul and Zakaria Al-Qodah
Water 2024, 16(12), 1640; https://doi.org/10.3390/w16121640 (registering DOI) - 7 Jun 2024
Abstract
Sanitary landfilling is the predominant process for solid urban waste disposal, but it generates leachate that poses environmental, economic, and social concerns. Landfill leachate (LL) contains complex and refractory pollutants and toxic compounds that can vary depending on landfill maturity, age, and biochemical [...] Read more.
Sanitary landfilling is the predominant process for solid urban waste disposal, but it generates leachate that poses environmental, economic, and social concerns. Landfill leachate (LL) contains complex and refractory pollutants and toxic compounds that can vary depending on landfill maturity, age, and biochemical reactions, making its treatment challenging. Due to its unique characteristics and occurrence in remote locations, LL requires separate treatment from wastewater. Various conventional treatment processes involving biological, chemical, and physical processes have been used for LL treatment, but a single treatment process is insufficient to meet environmental standards. This review demonstrates that combined treatment processes are more effective and efficient for LL treatment compared to single processes. Among the various combinations, chemical–chemical and chemical–biological treatments are the most commonly used. Specifically, the integration of Fenton with adsorption and a membrane bioreactor (MBR) with nanofiltration (NF) processes shows promising results. The combined processes of MBR with NF, Fenton with adsorption, and PF with biological treatment show maximum removal efficiencies for COD, reaching 99 ± 1%, 99%, 98%, and 97%, respectively. Additionally, the combined Fenton with adsorption process and EC with SPF process enhance biodegradability as indicated by increased BOD5/COD ratios, from 0.084 to 0.82 and 0.35 to 0.75, respectively. The findings emphasize the importance of developing and implementing enhanced combined treatment processes for LL, with the aim of achieving efficient and comprehensive pollutant mineralization. Such processes have the potential to address the environmental concerns associated with LL and contribute to sustainable waste management practices. Full article
(This article belongs to the Special Issue Water, Wastewater and Waste Management for Sustainable Development)
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19 pages, 940 KiB  
Article
Hyperspectral Leaf Area Index and Chlorophyll Retrieval over Forest and Row-Structured Vineyard Canopies
by Luke A. Brown, Harry Morris, Andrew MacLachlan, Francesco D’Adamo, Jennifer Adams, Ernesto Lopez-Baeza, Erika Albero, Beatriz Martínez, Sergio Sánchez-Ruiz, Manuel Campos-Taberner, Antonio Lidón, Cristina Lull, Inmaculada Bautista, Daniel Clewley, Gary Llewellyn, Qiaoyun Xie, Fernando Camacho, Julio Pastor-Guzman, Rosalinda Morrone, Morven Sinclair, Owen Williams, Merryn Hunt, Andreas Hueni, Valentina Boccia, Steffen Dransfeld and Jadunandan Dashadd Show full author list remove Hide full author list
Remote Sens. 2024, 16(12), 2066; https://doi.org/10.3390/rs16122066 (registering DOI) - 7 Jun 2024
Abstract
As an unprecedented stream of decametric hyperspectral observations becomes available from recent and upcoming spaceborne missions, effective algorithms are required to retrieve vegetation biophysical and biochemical variables such as leaf area index (LAI) and canopy chlorophyll content (CCC). In the context of missions [...] Read more.
As an unprecedented stream of decametric hyperspectral observations becomes available from recent and upcoming spaceborne missions, effective algorithms are required to retrieve vegetation biophysical and biochemical variables such as leaf area index (LAI) and canopy chlorophyll content (CCC). In the context of missions such as the Environmental Mapping and Analysis Program (EnMAP), Precursore Iperspettrale della Missione Applicativa (PRISMA), Copernicus Hyperspectral Imaging Mission for the Environment (CHIME), and Surface Biology Geology (SBG), several retrieval algorithms have been developed based upon the turbid medium Scattering by Arbitrarily Inclined Leaves (SAIL) radiative transfer model. Whilst well suited to cereal crops, SAIL is known to perform comparatively poorly over more heterogeneous canopies (including forests and row-structured crops). In this paper, we investigate the application of hybrid radiative transfer models, including a modified version of SAIL (rowSAIL) and the Invertible Forest Reflectance Model (INFORM), to such canopies. Unlike SAIL, which assumes a horizontally homogeneous canopy, such models partition the canopy into geometric objects, which are themselves treated as turbid media. By enabling crown transmittance, foliage clumping, and shadowing to be represented, they provide a more realistic representation of heterogeneous vegetation. Using airborne hyperspectral data to simulate EnMAP observations over vineyard and deciduous broadleaf forest sites, we demonstrate that SAIL-based algorithms provide moderate retrieval accuracy for LAI (RMSD = 0.92–2.15, NRMSD = 40–67%, bias = −0.64–0.96) and CCC (RMSD = 0.27–1.27 g m−2, NRMSD = 64–84%, bias = −0.17–0.89 g m−2). The use of hybrid radiative transfer models (rowSAIL and INFORM) reduces bias in LAI (RMSD = 0.88–1.64, NRMSD = 27–64%, bias = −0.78–−0.13) and CCC (RMSD = 0.30–0.87 g m−2, NRMSD = 52–73%, bias = 0.03–0.42 g m−2) retrievals. Based on our results, at the canopy level, we recommend that hybrid radiative transfer models such as rowSAIL and INFORM are further adopted for hyperspectral biophysical and biochemical variable retrieval over heterogeneous vegetation. Full article
(This article belongs to the Section Environmental Remote Sensing)
Article
A Method for Predicting Inertial Navigation System Positioning Errors Using a Back Propagation Neural Network Based on a Particle Swarm Optimization Algorithm
by Yabo Wang, Ruihan Jiao, Tingxiao Wei, Zhaoxing Guo and Yueyang Ben
Sensors 2024, 24(12), 3722; https://doi.org/10.3390/s24123722 (registering DOI) - 7 Jun 2024
Abstract
In order to reduce the position errors of the Global Positioning System/Strapdown Inertial Navigation System (GPS/SINS) integrated navigation system during GPS denial, this paper proposes a method based on the Particle Swarm Optimization–Back Propagation Neural Network (PSO-BPNN) to replace the GPS for positioning. [...] Read more.
In order to reduce the position errors of the Global Positioning System/Strapdown Inertial Navigation System (GPS/SINS) integrated navigation system during GPS denial, this paper proposes a method based on the Particle Swarm Optimization–Back Propagation Neural Network (PSO-BPNN) to replace the GPS for positioning. The model relates the position information, velocity information, attitude information output by the SINS, and the navigation time to the position errors between the position information output by the SINS and the actual position information. The performance of the model is compared with the BPNN through an actual ship experiment. The results show that the PSO-BPNN can obviously reduce the position errors in the case of GPS signal denial. Full article
(This article belongs to the Section Navigation and Positioning)
Article
Embodied Communication, Sensed Atmospheres, Joint Situations: Human–Horse Encounters from a Neophenomenological Perspective
by Robert Pütz
Animals 2024, 14(12), 1720; https://doi.org/10.3390/ani14121720 (registering DOI) - 7 Jun 2024
Abstract
This article shows that the German philosopher Hermann Schmitz’s new phenomenology can make a valuable contribution to human–animal studies. The three concepts suitable for this purpose are, first, Schmitz’s concept of embodied communication, which can be applied to trans-species encounters; second, his understanding [...] Read more.
This article shows that the German philosopher Hermann Schmitz’s new phenomenology can make a valuable contribution to human–animal studies. The three concepts suitable for this purpose are, first, Schmitz’s concept of embodied communication, which can be applied to trans-species encounters; second, his understanding of atmospheres, which are always co-communicated in trans-species encounters; and, third, his conception of situation, which can help with analyzing the relationship of society to animals. My contribution applies these three basic elements of new phenomenology—embodied communication, atmosphere, and situation—to the analysis of the encounters between humans and horses. This paper demonstrates that embodied communication in particular is not only a worthwhile object of research but can also serve as a mode of producing scientific insight. Full article
(This article belongs to the Special Issue Second Edition: Research on the Human–Companion Animal Relationship)
Article
A Cross-View Geo-Localization Algorithm Using UAV Image and Satellite Image
by Jiqi Fan, Enhui Zheng, Yufei He and Jianxing Yang
Sensors 2024, 24(12), 3719; https://doi.org/10.3390/s24123719 (registering DOI) - 7 Jun 2024
Abstract
Within research on the cross-view geolocation of UAVs, differences in image sources and interference from similar scenes pose huge challenges. Inspired by multimodal machine learning, in this paper, we design a single-stream pyramid transformer network (SSPT). The backbone of the model uses the [...] Read more.
Within research on the cross-view geolocation of UAVs, differences in image sources and interference from similar scenes pose huge challenges. Inspired by multimodal machine learning, in this paper, we design a single-stream pyramid transformer network (SSPT). The backbone of the model uses the self-attention mechanism to enrich its own internal features in the early stage and uses the cross-attention mechanism in the later stage to refine and interact with different features to eliminate irrelevant interference. In addition, in the post-processing part of the model, a header module is designed for upsampling to generate heat maps, and a Gaussian weight window is designed to assign label weights to make the model converge better. Together, these methods improve the positioning accuracy of UAV images in satellite images. Finally, we also use style transfer technology to simulate various environmental changes in order to expand the experimental data, further proving the environmental adaptability and robustness of the method. The final experimental results show that our method yields significant performance improvement: The relative distance score (RDS) of the SSPT-384 model on the benchmark UL14 dataset is significantly improved from 76.25% to 84.40%, while the meter-level accuracy (MA) of 3 m, 5 m, and 20 m is increased by 12%, 12%, and 10%, respectively. For the SSPT-256 model, the RDS has been increased to 82.21%, and the meter-level accuracy (MA) of 3 m, 5 m, and 20 m has increased by 5%, 5%, and 7%, respectively. It still shows strong robustness on the extended thermal infrared (TIR), nighttime, and rainy day datasets. Full article
(This article belongs to the Section Navigation and Positioning)
Article
Sex-Differences in Response to Treatment with Liraglutide 3.0 mg
by Ilaria Milani, Gloria Guarisco, Marianna Chinucci, Chiara Gaita, Frida Leonetti and Danila Capoccia
J. Clin. Med. 2024, 13(12), 3369; https://doi.org/10.3390/jcm13123369 (registering DOI) - 7 Jun 2024
Abstract
Background: Sex differences characterize the prevalence and attitudes toward weight management. Despite limited evidence suggesting greater weight loss in women with anti-obesity pharmacotherapy, sex-specific analysis remains underexplored. This retrospective study aimed to evaluate the sex-specific response to liraglutide 3.0 mg treatment in [...] Read more.
Background: Sex differences characterize the prevalence and attitudes toward weight management. Despite limited evidence suggesting greater weight loss in women with anti-obesity pharmacotherapy, sex-specific analysis remains underexplored. This retrospective study aimed to evaluate the sex-specific response to liraglutide 3.0 mg treatment in people with obesity without type 2 diabetes (T2D). Methods: Data were collected from 47 patients (31 women, 16 men) with age > 18 years; BMI ≥ 30 kg/m2; absence of T2D; and exclusion of prior anti-obesity treatment, comorbidities, or bariatric surgery. Only patients who maintained the liraglutide 3.0 mg dose for at least 6 months were included. Results: Both sexes showed significant reductions in weight and BMI at 3 and 6 months. Men achieved greater weight loss (WL), BMI reduction, %WL, WL > 5%, and >10% than women, and they also showed more significant improvements in metabolic parameters (total and LDL cholesterol, Fibrosis-4 Index FIB-4). No significant sex differences were observed in glucose metabolism or renal function. Conclusions: This study showed a greater therapeutic effect of liraglutide 3.0 mg in men. Given men’s higher risk of cardiovascular disease (CVD), and underrepresentation in clinical weight loss programs, these findings may increase male engagement and improve their CVD risk. Full article
(This article belongs to the Section Endocrinology & Metabolism)
26 pages, 788 KiB  
Article
Zynerator: Bridging Model-Driven Architecture and Microservices for Enhanced Software Development
by Younes Zouani and Mohamed Lachgar
Electronics 2024, 13(12), 2237; https://doi.org/10.3390/electronics13122237 (registering DOI) - 7 Jun 2024
Abstract
Model-driven architecture (MDA) has demonstrated significant potential in automating code generation processes, yet its application often falls short in addressing the complexities of modern architectural styles, notably microservices. Microservice architecture, characterized by its decomposition of applications into small, independently deployable services, presents unique [...] Read more.
Model-driven architecture (MDA) has demonstrated significant potential in automating code generation processes, yet its application often falls short in addressing the complexities of modern architectural styles, notably microservices. Microservice architecture, characterized by its decomposition of applications into small, independently deployable services, presents unique challenges and opportunities that traditional MDA approaches struggle to accommodate. In this paper, Zynerator, a novel framework that bridges the gap between model-driven architecture and microservice development, is presented. By integrating semantic decorators into the PIM, Zynerator empowers end-users to express intricate functional and non-functional requirements, laying the foundation for the generation of contextually appropriate code. Moreover, Zynerator goes beyond traditional MDA capabilities by offering a solution for microservice architecture integration, enabling the generation of service gateways, service discovery mechanisms, and other essential components inherent to microservice ecosystems. This integration not only streamlines the development process but also ensures the scalability, resilience, and maintainability of microservice-based applications. Through Zynerator, a flexible and comprehensive solution is presented that leverages the strengths of model-driven architecture (MDA), while addressing the evolving needs of modern software architecture, particularly in the realm of microservice development. Empirical results showed that Zynerator enhances code generation alignment to functional requirements by 55%, reduces microservice adoption in terms of communication and deployment times by 30%, and increases system scalability by supporting up to 10,000 concurrent users, without performance degradation. Full article
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Article
Characterization of Taxonomic and Functional Dynamics Associated with Harmful Algal Bloom Formation in Recreational Water Ecosystems
by Faizan Saleem, Rachelle Atrache, Jennifer L. Jiang, Kevin L. Tran, Enze Li, Athanasios Paschos, Thomas A. Edge and Herb E. Schellhorn
Toxins 2024, 16(6), 263; https://doi.org/10.3390/toxins16060263 (registering DOI) - 7 Jun 2024
Abstract
Harmful algal bloom (HAB) formation leads to the eutrophication of water ecosystems and may render recreational lakes unsuitable for human use. We evaluated the applicability and comparison of metabarcoding, metagenomics, qPCR, and ELISA-based methods for cyanobacteria/cyanotoxin detection in bloom and non-bloom sites for [...] Read more.
Harmful algal bloom (HAB) formation leads to the eutrophication of water ecosystems and may render recreational lakes unsuitable for human use. We evaluated the applicability and comparison of metabarcoding, metagenomics, qPCR, and ELISA-based methods for cyanobacteria/cyanotoxin detection in bloom and non-bloom sites for the Great Lakes region. DNA sequencing-based methods robustly identified differences between bloom and non-bloom samples (e.g., the relative prominence of Anabaena and Planktothrix). Shotgun sequencing strategies also identified the enrichment of metabolic genes typical of cyanobacteria in bloom samples, though toxin genes were not detected, suggesting deeper sequencing or PCR methods may be needed to detect low-abundance toxin genes. PCR and ELISA indicated microcystin levels and microcystin gene copies were significantly more abundant in bloom sites. However, not all bloom samples were positive for microcystin, possibly due to bloom development by non-toxin-producing species. Additionally, microcystin levels were significantly correlated (positively) with microcystin gene copy number but not with total cyanobacterial 16S gene copies. In summary, next-generation sequencing-based methods can identify specific taxonomic and functional targets, which can be used for absolute quantification methods (qPCR and ELISA) to augment conventional water monitoring strategies. Full article
Review
Role of Kir4.1 Channel in Auditory Function: Impact on Endocochlear Potential and Hearing Loss
by Silvia Fracaro, Filippo Hellies, Gino Marioni, Davide Brotto, Sebastiano Franchella, Elisabetta Zanoletti, Giovanna Albertin and Laura Astolfi
Appl. Sci. 2024, 14(12), 4985; https://doi.org/10.3390/app14124985 (registering DOI) - 7 Jun 2024
Abstract
Hearing loss can result from impairments in structures that support endocochlear potential, as they play a crucial role in the transduction and transmission of auditory waves. This aspect has been the subject of several studies to date. In our review, the role of [...] Read more.
Hearing loss can result from impairments in structures that support endocochlear potential, as they play a crucial role in the transduction and transmission of auditory waves. This aspect has been the subject of several studies to date. In our review, the role of ion transport channels and pumps involved in hearing function has been highlighted, emphasizing how important the Kir4.1 channel is in maintaining the endocochlear potential. The Kir4.1 channel, a member of the inwardly rectifying potassium channel (Kir) family, plays a key role in the regulation of cell electrical activity and potassium ion homeostasis. The cochlear expression of these channels is at the level of the intermediate cells of the vascular stria, in the root cells of the outer sulcus, and in the glial cells of the spiral ganglion. In development, its expression demonstrates its involvement in the progression of pathologies related to potassium channel dysfunction, and its activation in the stria vascularis is directly related to the generation of endocochlear potential. Kir4.1 is fundamental in stabilizing the resting membrane potential of cells and modulating their excitability, as it facilitates a greater influx of potassium into cells compared to efflux when the membrane potential is negative. Mutations in the K+ channel gene KCNJ10 (Kir4.1) have been associated with several disorders, with the most significant studies on EAST/SeSAME syndrome and Pendred syndrome. Recent research has explored the metabolic importance of potassium channel changes associated with stria vascularis degeneration in the progression of age-related hearing loss. Furthermore, in ototoxicity studies, the Kir4.1 channel has been shown to have the ability to compensate for the deficiency of other K+ channels, as it maintains the cochlear homeostasis by correcting the imbalanced K+ concentration. Full article
(This article belongs to the Special Issue Hearing Loss: From Pathophysiology to Therapies and Habilitation)
Article
Effects of GmERF5-Responsive Effector on Soybean Symbiotic Nodulation
by Candong Li, Yuxin Jin, Weinan Tang, Xuemei Li, Chunyan Liu, Jinhui Wang, Xiaoxia Wu, Qingshan Chen, Feishi Luan and Dawei Xin
Agronomy 2024, 14(6), 1239; https://doi.org/10.3390/agronomy14061239 (registering DOI) - 7 Jun 2024
Abstract
The type III secretion system (T3SS) of Rhizobium plays a crucial role during the establishment of the soybean (Glycine max (L.) Merr.)-Rhizobium symbiosis system. Additionally, host-specific nodulation may also depend on the Nops (nodulation outer proteins) secreted by the T3SS of [...] Read more.
The type III secretion system (T3SS) of Rhizobium plays a crucial role during the establishment of the soybean (Glycine max (L.) Merr.)-Rhizobium symbiosis system. Additionally, host-specific nodulation may also depend on the Nops (nodulation outer proteins) secreted by the T3SS of Rhizobium. However, there is limited understanding of the response of soybean genes to Nops. In this study, a NopC mutant, HH103ΩNopC, was constructed from Sinorhizobium fredii HH103 and then utilized to assess the impact of the NopC on nodulation. An RNA-seq analysis revealed that the GmERF5 (Glycine max Ethylene Responsive Factor 5) gene was induced by NopC, which was confirmed by qRT-PCR. Furthermore, an overexpression of the GmERF5 hair-root system was constructed to investigate the effect of GmERF5 on nodulation and its interaction with NopC. Differences in nodule number and nodule dry weight in the overexpression of the GmERF5 hair-root system supported the conclusion that GmERF5 can regulate soybean nodule phenotype via NopC. These results elucidate the genetic mechanisms that regulate nodule phenotype in soybean. Full article
Article
Monotonicity Results of Ratios Between Normalized Tails of Maclaurin Power Series Expansions of Sine and Cosine
by Da-Wei Niu and Feng Qi
Mathematics 2024, 12(12), 1781; https://doi.org/10.3390/math12121781 (registering DOI) - 7 Jun 2024
Abstract
In the paper, the authors establish the monotonicity results of the ratios between normalized tails of the Maclaurin power series expansions of the sine and cosine functions and restate them in terms of the generalized hypergeometric functions. Full article
(This article belongs to the Section Computational and Applied Mathematics)
Article
Enhancing Efficiency and Security in Unbalanced PSI-CA Protocols through Cloud Computing and Homomorphic Encryption in Mobile Networks
by Wuzheng Tan, Shenglong Du and Jian Weng
Future Internet 2024, 16(6), 205; https://doi.org/10.3390/fi16060205 (registering DOI) - 7 Jun 2024
Abstract
Private Set Intersection Cardinality (PSI-CA) is a cryptographic method in secure multi-party computation that allows entities to identify the cardinality of the intersection without revealing their private data.Traditional approaches assume similar-sized datasets and equal computational power, overlooking practical imbalances. In real-world applications, dataset [...] Read more.
Private Set Intersection Cardinality (PSI-CA) is a cryptographic method in secure multi-party computation that allows entities to identify the cardinality of the intersection without revealing their private data.Traditional approaches assume similar-sized datasets and equal computational power, overlooking practical imbalances. In real-world applications, dataset sizes and computational capacities often vary, particularly in Internet of Things and mobile scenarios where device limitations restrict computational types. Traditional PSI-CA protocols are inefficient here, as computational and communication complexities correlate with the size of larger datasets. Thus, adapting PSI-CA protocols to these imbalances is crucial. This paper explores unbalanced scenarios where one party (the receiver) has a relatively small dataset and limited computational power, while the other party (the sender) has a large amount of data and strong computational capabilities.This paper, based on the concept of commutative encryption, introduces Cuckoo filter, cloud computing technology, and homomorphic encryption, among other technologies, to construct three novel solutions for unbalanced Private Set Intersection Cardinality (PSI-CA): an unbalanced PSI-CA protocol based on Cuckoo filter, an unbalanced PSI-CA protocol based on single-cloud assistance, and an unbalanced PSI-CA protocol based on dual-cloud assistance. Depending on performance and security requirements, different protocols can be employed for various applications. Full article
(This article belongs to the Section Cybersecurity)
Communication
Fast and Simple Molecular Test for Sex Determination of the Monomorphic Eudromia elegans Individuals
by Zuzana Majchrakova, Marcela Bielikova, Evelina Hrckova Turnova, Petra Gasparkova, Jan Turna and Andrej Dudas
Animals 2024, 14(12), 1719; https://doi.org/10.3390/ani14121719 (registering DOI) - 7 Jun 2024
Abstract
Sex determination based just on morphological traits such as plumage dichromatism, sexual size dimorphism, behavior, or vocalizations is really challenging because of the sexual monomorphism present in more than half of avian species. Currently, a lot of them can be tested through DNA-based [...] Read more.
Sex determination based just on morphological traits such as plumage dichromatism, sexual size dimorphism, behavior, or vocalizations is really challenging because of the sexual monomorphism present in more than half of avian species. Currently, a lot of them can be tested through DNA-based procedures, but they do not fit all the avian species, such as Eudromia elegans. The aim of this study was to design a new molecular method suitable for routine sex determination for that species that is fast, simple, and cost- and time- effective. DNA was isolated from dry blood stain and/or chest feather samples of E. elegans species. We used two sets of sex-specific primers (ZF/ZR and WF/WR) to amplify the expected fragments localized on the highly conserved CHD1 gene to distinguish between sexes due to the W-specific DNA sequence present only in females. We confirmed the accuracy and consistency of the PCR-based method based on length differences to distinguish between the sexes of E. elegans, which amplified two fragments in females and one fragment in males. Full article
28 pages, 9284 KiB  
Article
Toward Fully Automated Inspection of Critical Assets Supported by Autonomous Mobile Robots, Vision Sensors, and Artificial Intelligence
by Javier Sanchez-Cubillo, Javier Del Ser and José Luis Martin
Sensors 2024, 24(12), 3721; https://doi.org/10.3390/s24123721 (registering DOI) - 7 Jun 2024
Abstract
Robotic inspection is advancing in performance capabilities and is now being considered for industrial applications beyond laboratory experiments. As industries increasingly rely on complex machinery, pipelines, and structures, the need for precise and reliable inspection methods becomes paramount to ensure operational integrity and [...] Read more.
Robotic inspection is advancing in performance capabilities and is now being considered for industrial applications beyond laboratory experiments. As industries increasingly rely on complex machinery, pipelines, and structures, the need for precise and reliable inspection methods becomes paramount to ensure operational integrity and mitigate risks. AI-assisted autonomous mobile robots offer the potential to automate inspection processes, reduce human error, and provide real-time insights into asset conditions. A primary concern is the necessity to validate the performance of these systems under real-world conditions. While laboratory tests and simulations can provide valuable insights, the true efficacy of AI algorithms and robotic platforms can only be determined through rigorous field testing and validation. This paper aligns with this need by evaluating the performance of one-stage models for object detection in tasks that support and enhance the perception capabilities of autonomous mobile robots. The evaluation addresses both the execution of assigned tasks and the robot’s own navigation. Our benchmark of classification models for robotic inspection considers three real-world transportation and logistics use cases, as well as several generations of the well-known YOLO architecture. The performance results from field tests using real robotic devices equipped with such object detection capabilities are promising, and expose the enormous potential and actionability of autonomous robotic systems for fully automated inspection and maintenance in open-world settings. Full article
28 pages, 789 KiB  
Article
Unlocking Blockchain UTXO Transactional Patterns and Their Effect on Storage and Throughput Trade-Offs
by David Melo, Saúl Eduardo Pomares-Hernández, Lil María Xibai Rodríguez-Henríquez and Julio César Pérez-Sansalvador
Computers 2024, 13(6), 146; https://doi.org/10.3390/computers13060146 (registering DOI) - 7 Jun 2024
Abstract
Blockchain technology ensures record-keeping by redundantly storing and verifying transactions on a distributed network of nodes. Permissionless blockchains have pushed the development of decentralized applications (DApps) characterized by distributed business logic, resilience to centralized failures, and data immutability. However, storage scalability without sacrificing [...] Read more.
Blockchain technology ensures record-keeping by redundantly storing and verifying transactions on a distributed network of nodes. Permissionless blockchains have pushed the development of decentralized applications (DApps) characterized by distributed business logic, resilience to centralized failures, and data immutability. However, storage scalability without sacrificing throughput is one of the remaining open challenges in permissionless blockchains. Enhancing throughput often compromises storage, as seen in projects such as Elastico, OmniLedger, and RapidChain. On the other hand, solutions seeking to save storage, such as CUB, Jidar, SASLedger, and SE-Chain, reduce the transactional throughput. To our knowledge, no analysis has been performed that relates storage growth to transactional throughput. In this article, we delve into the execution of the Bitcoin and Ethereum transactional models, unlocking patterns that represent any transaction on the blockchain. We reveal the trade-off between transactional throughput and storage. To achieve this, we introduce the spent-by relation, a new abstraction of the UTXO model that utilizes a directed acyclic graph (DAG) to reveal the patterns and allows for a graph with granular information. We then analyze the transactional patterns to identify the most storage-intensive ones and those that offer greater flexibility in the throughput/storage trade-off. Finally, we present an analytical study showing that the UTXO model is more storage-intensive than the account model but scales better in transactional throughput. Full article
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Article
Statistical Parameters Extracted from Radar Sea Clutter Simulated under Different Operational Conditions
by Yung-Cheng Pai and Jean-Fu Kiang
Sensors 2024, 24(12), 3720; https://doi.org/10.3390/s24123720 (registering DOI) - 7 Jun 2024
Abstract
A complete framework of predicting the attributes of sea clutter under different operational conditions, specified by wind speed, wind direction, grazing angle, and polarization, is proposed for the first time. This framework is composed of empirical spectra to characterize sea-surface profiles under different [...] Read more.
A complete framework of predicting the attributes of sea clutter under different operational conditions, specified by wind speed, wind direction, grazing angle, and polarization, is proposed for the first time. This framework is composed of empirical spectra to characterize sea-surface profiles under different wind speeds, the Monte Carlo method to generate realizations of sea-surface profiles, the physical-optics method to compute the normalized radar cross-sections (NRCSs) from individual sea-surface realizations, and regression of NRCS data (sea clutter) with an empirical probability density function (PDF) characterized by a few statistical parameters. JONSWAP and Hwang ocean-wave spectra are adopted to generate realizations of sea-surface profiles at low and high wind speeds, respectively. The probability density functions of NRCSs are regressed with K and Weibull distributions, each characterized by two parameters. The probability density functions in the outlier regions of weak and strong signals are regressed with a power-law distribution, each characterized by an index. The statistical parameters and power-law indices of the K and Weibull distributions are derived for the first time under different operational conditions. The study reveals succinct information of sea clutter that can be used to improve the radar performance in a wide variety of complicated ocean environments. The proposed framework can be used as a reference or guidelines for designing future measurement tasks to enhance the existing empirical models on ocean-wave spectra, normalized radar cross-sections, and so on. Full article
(This article belongs to the Section Physical Sensors)
Article
Adaptive Fuzzy Integral Sliding Mode Cooperative Control Based on Time-Delay Estimation for Free-Floating Close-Chain Manipulators
by Zhongcan Li, Yufei Zhou, Mingchao Zhu and Qingwen Wu
Sensors 2024, 24(12), 3718; https://doi.org/10.3390/s24123718 (registering DOI) - 7 Jun 2024
Abstract
Space manipulators are expected to perform more challenging missions in on-orbit service (OOS) systems, but there are some unique characteristics that are not found on ground-based robots, such as dynamic coupling between space bases and manipulators, limited fuel supply, and working with unfixed [...] Read more.
Space manipulators are expected to perform more challenging missions in on-orbit service (OOS) systems, but there are some unique characteristics that are not found on ground-based robots, such as dynamic coupling between space bases and manipulators, limited fuel supply, and working with unfixed bases. This paper focuses on trajectory-tracking control and internal force control for free-floating close-chain manipulators. First, the kinematics and dynamics of free-floating close-chain manipulators are given using the momentum conservation and spatial operator algebra (SOA) methodologies, respectively. Furthermore, an adaptive fuzzy integral sliding mode controller (AFISMC) based on time delay estimation (TDE) was designed for trajectory-tracking control, and a proportional-integral (PI) control strategy was adopted for internal force control. The global asymptotic stability of the proposed controller was proven by using the Lyapunov methodology. Three cases were conducted to verify the efficiency of the controller by using numerical simulations on two six-link manipulators with a free-floating base. The controller presents the desired tracking capability. Full article
(This article belongs to the Section Sensors and Robotics)
Article
Distinct Gut Microbial Signature and Host Genetic Variants in Association with Liver Fibrosis Severity in Patients with MASLD
by Nantawat Satthawiwat, Thananya Jinato, Sawannee Sutheeworapong, Natthaporn Tanpowpong, Natthaya Chuaypen and Pisit Tangkijvanich
Nutrients 2024, 16(12), 1800; https://doi.org/10.3390/nu16121800 (registering DOI) - 7 Jun 2024
Abstract
Gut microbiota might affect the severity and progression of metabolic dysfunction-associated steatotic liver disease (MASLD). We aimed to characterize gut dysbiosis and clinical parameters regarding fibrosis stages assessed by magnetic resonance elastography. This study included 156 patients with MASLD, stratified into no/mild fibrosis [...] Read more.
Gut microbiota might affect the severity and progression of metabolic dysfunction-associated steatotic liver disease (MASLD). We aimed to characterize gut dysbiosis and clinical parameters regarding fibrosis stages assessed by magnetic resonance elastography. This study included 156 patients with MASLD, stratified into no/mild fibrosis (F0–F1) and moderate/severe fibrosis (F2–F4). Fecal specimens were sequenced targeting the V4 region of the 16S rRNA gene and analyzed using bioinformatics. The genotyping of PNPLA3, TM6SF2, and HSD17B13 was assessed by allelic discrimination assays. Our data showed that gut microbial profiles between groups significantly differed in beta-diversity but not in alpha-diversity indices. Enriched Fusobacterium and Escherichia_Shigella, and depleted Lachnospira were found in the F2–F4 group versus the F0–F1 group. Compared to F0–F1, the F2–F4 group had elevated plasma surrogate markers of gut epithelial permeability and bacterial translocation. The bacterial genera, PNPLA3 polymorphisms, old age, and diabetes were independently associated with advanced fibrosis in multivariable analyses. Using the Random Forest classifier, the gut microbial signature of three genera could differentiate the groups with high diagnostic accuracy (AUC of 0.93). These results indicated that the imbalance of enriched pathogenic genera and decreased beneficial bacteria, in association with several clinical and genetic factors, were potential contributors to the pathogenesis and progression of MASLD. Full article
(This article belongs to the Section Prebiotics and Probiotics)

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