The 2023 MDPI Annual Report has
been released!
 
5 pages, 181 KiB  
Editorial
Applications of Machine Learning in National Territory Spatial Planning
by Bing Xue, Yaotian Xu, Jun Yang and Xiangming Xiao
Appl. Sci. 2024, 14(10), 4045; https://doi.org/10.3390/app14104045 (registering DOI) - 10 May 2024
Abstract
National territory spatial planning guides national spatial development and the spatial blueprint of sustainable development [...] Full article
12 pages, 14951 KiB  
Article
Influence of Xanthan Gum-Based Soil Conditioners on the Geotechnical Properties of Soils
by Barbara Fortuna, Janko Logar, Alessandro Sorze, Francesco Valentini and Jasna Smolar
Appl. Sci. 2024, 14(10), 4044; https://doi.org/10.3390/app14104044 (registering DOI) - 10 May 2024
Abstract
The impact of climate change has become increasingly severe in forests, where droughts and strong winds on the one hand and extreme rainfall events on the other hand can damage forest ecosystems. To mitigate the effects of drought and enhance soil water retention [...] Read more.
The impact of climate change has become increasingly severe in forests, where droughts and strong winds on the one hand and extreme rainfall events on the other hand can damage forest ecosystems. To mitigate the effects of drought and enhance soil water retention capacity, three types of soil conditioners (SCs), labeled SC_R, SC_CG, and SC_ZZC, were developed as part of the European project ONEforest. All the conditioners are based on Xanthan gum and have different types and amounts of fillers with diverse cellulose fiber lengths. These can offer the potential to optimize the SC characteristics, e.g., water absorption, water retention, and mechanical stability. This paper focuses on the influence of fillers in the SCs on the geotechnical properties of forest soils from Ljubelj in the Alpine part of Slovenia (S1), Catalonia, northeastern Spain (S2), and Heldburg, Germany (S3). The results show an increase of 53% to 100% in the water absorption of treated soil. A less favorable impact of the SCs was found on the drained shear strength and the compressibility. The drained shear strength of untreated forest soils in a saturated state was S1 c′ = 4.4 kPa, φ′ = 33.5°; S2 c′ = 1.4 kPa, φ′ = 30.0°; and S3 c′ = 12 kPa, φ′ = 28.0°. The addition of SCs results in a reduction in the drained shear strength of saturated mixtures. The reduction depends on the dosage of added SC—whether it is a low (L) or a high (H) dosage. For instance, when the soil S1 was treated with a low dosage of the soil conditioner SC_R, it demonstrated a cohesion (c′) of 11 kPa and a friction angle (φ′) of 27.0°. However, increasing the dosage of the SC_R led to a decrease in both the cohesion and the friction angle for the same soil (c′ = 7.7 kPa, φ′ = 25.0°). Additionally, the type of soil conditioner also impacts the drained shear strength. Among the mixtures with a high dosage of the SC_R, SC_CG, or SC_ZZC, those containing the SC_CG with the longest fibers stand out, demonstrating the highest friction angle. Therefore, longer fibers can be a promising component of the SCs to reduce the negative influence of XG on the mechanical properties of treated soils. Full article
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67 pages, 5953 KiB  
Review
N-Heterocycles as Promising Antiviral Agents: A Comprehensive Overview
by Gulraiz Ahmad, Maria Sohail, Muhammad Bilal, Nasir Rasool, Muhammad Usman Qamar, Codrut Ciurea, Luigi Geo Marceanu and Catalin Misarca
Molecules 2024, 29(10), 2232; https://doi.org/10.3390/molecules29102232 (registering DOI) - 10 May 2024
Abstract
Viruses are a real threat to every organism at any stage of life leading to extensive infections and casualties. N-heterocycles can affect the viral life cycle at many points, including viral entrance into host cells, viral genome replication, and the production of [...] Read more.
Viruses are a real threat to every organism at any stage of life leading to extensive infections and casualties. N-heterocycles can affect the viral life cycle at many points, including viral entrance into host cells, viral genome replication, and the production of novel viral species. Certain N-heterocycles can also stimulate the host’s immune system, producing antiviral cytokines and chemokines that can stop the reproduction of viruses. This review focused on recent five- or six-membered synthetic N-heterocyclic molecules showing antiviral activity through SAR analyses. The review will assist in identifying robust scaffolds that might be utilized to create effective antiviral drugs with either no or few side effects. Full article
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18 pages, 967 KiB  
Article
Gravitating Scalarons with Inverted Higgs Potential
by Xiao Yan Chew and Kok-Geng Lim
Universe 2024, 10(5), 212; https://doi.org/10.3390/universe10050212 (registering DOI) - 10 May 2024
Abstract
Previously, a class of regular and asymptotically flat gravitating scalar solitons (scalarons) has been constructed in the Einstein–Klein–Gordon (EKG) theory by adopting a phantom field with Higgs-like potential where the kinetic term has the wrong sign and the scalaron possesses the negative Arnowitt–Deser–Misner [...] Read more.
Previously, a class of regular and asymptotically flat gravitating scalar solitons (scalarons) has been constructed in the Einstein–Klein–Gordon (EKG) theory by adopting a phantom field with Higgs-like potential where the kinetic term has the wrong sign and the scalaron possesses the negative Arnowitt–Deser–Misner (ADM) mass as a consequence. In this paper, we demonstrate that the use of the phantom field can be avoided by inverting the Higgs-like potential in the EKG system when the kinetic term has a proper sign, such that the corresponding gravitating scalaron can possess the positive ADM mass. We systematically study the basic properties of the gravitating scalaron, such as the ADM mass, the energy conditions, the geodesics of test particles, etc. Moreover, we find that it can be smoothly connected to the counterpart hairy black hole solutions from our recent work in the small horizon limit. Full article
(This article belongs to the Special Issue Universe: Feature Papers 2024 – Compact Objects)
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22 pages, 36847 KiB  
Article
Staged Temperature- and Humidity-Controlled Combined Infrared Hot-Air Drying (TH-IRHAD) of Sea Buckthorn Reduces Drying Time, Energy Consumption, and Browning
by Lichun Zhu, Xinyu Ji, Junzhe Gu, Xuetao Zhang, Mengqing Li, Qian Zhang, Xuhai Yang and Zhihua Geng
Agriculture 2024, 14(5), 743; https://doi.org/10.3390/agriculture14050743 (registering DOI) - 10 May 2024
Abstract
Sea buckthorn has garnered significant attention owing to its nutritional richness; however, it has a limited shelf life. In this study, the drying process of sea buckthorn was categorized into the first-, second-, and third-drying stages. Regression models were employed to examine the [...] Read more.
Sea buckthorn has garnered significant attention owing to its nutritional richness; however, it has a limited shelf life. In this study, the drying process of sea buckthorn was categorized into the first-, second-, and third-drying stages. Regression models were employed to examine the effects of the drying temperature, relative humidity of the medium, and prolonged high humidity retention on various parameters during the first- and second-drying stages. Comparative analysis revealed that the optimal drying conditions for the first-drying stage of sea buckthorn were a drying temperature of 80 °C, relative humidity of 28%, and high humidity retention time of 84 min. In the second-drying phase, the optimal conditions were a drying temperature of 78 °C, a relative humidity of 17%, and a high humidity retention time of 84 min. One-way optimization revealed that the optimal drying temperature for the third-drying stage was 70 °C. The implementation of temperature- and humidity-controlled infrared hot-air drying (TH-IRHAD) techniques considerably improved the outcomes. Specifically, the drying time, energy consumption, and degree of browning decreased by 34.43%, 36.29%, and 21.43%, respectively, whereas the brightness, rehydration ratio, total flavonoid content, and total phenol content increased by 8.94%, 16.99%, 20.57%, and 28.32%, respectively. Staged TH-IRHAD substantially reduced the drying duration, increased the efficiency, and enhanced the drying quality. Full article
(This article belongs to the Section Agricultural Technology)
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14 pages, 2895 KiB  
Article
Curating Community behind Barbed Wire: Canadian Prisoner of War Art from the Second World War
by Sarafina Pagnotta
Genealogy 2024, 8(2), 54; https://doi.org/10.3390/genealogy8020054 (registering DOI) - 10 May 2024
Abstract
Though often under-represented in the official and national narratives and in Canadian military historiography more broadly, the intimate and personal lived experiences of Canadian prisoners of war (POW) during the Second World War can be found in archives, photography collections, and collections of [...] Read more.
Though often under-represented in the official and national narratives and in Canadian military historiography more broadly, the intimate and personal lived experiences of Canadian prisoners of war (POW) during the Second World War can be found in archives, photography collections, and collections of war art. In an attempt to see past the mythologised versions of POWs that appear in Hollywood films, best-selling monographs, and other forms of popular culture, it is through bits of ephemera—including wartime log books and the drawings carefully kept and sent home to loved ones along with handwritten letters—that the stories of non-combatant men and women who spent their war as POWs, can be told. Together, Canadian POWs created and curated community and fostered unconventional family ties, sometimes called “emotional communities”, through the collection and accumulation of drawings, illustrations, paintings, and other examples of war art on the pages of their wartime log books while living behind barbed wire. This article uncovers some of these stories, buried in the thousands of boxes in the George Metcalf Archival Collection—the textual archives—at the Canadian War Museum (CWM) in Ottawa, Ontario, Canada. Full article
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16 pages, 3953 KiB  
Article
“This Is How/You’ll End”: Holocaust Poems as War Ephemera
by Yael S. Hacohen
Genealogy 2024, 8(2), 53; https://doi.org/10.3390/genealogy8020053 (registering DOI) - 10 May 2024
Abstract
During the Holocaust, poets went to extraordinary lengths to write their poems and transmit them. Poems that were written during those years were often buried in the ground, stitched into clothing, smuggled out of prisons, or graffitied onto walls. These object documents carried [...] Read more.
During the Holocaust, poets went to extraordinary lengths to write their poems and transmit them. Poems that were written during those years were often buried in the ground, stitched into clothing, smuggled out of prisons, or graffitied onto walls. These object documents carried more than facts about these events; they carried the feeling of living through these events. This research explores the last poems of four Holocaust poets, Władysław Szlengel, Selma Meerbaum-Eisinger, Hannah Szenes, and Abramek Koplowicz, investigating not only the poems but their object-ness and their stories of transference. These poems, like urgent postcards, deliver messages to a family, to a community, to the world. They ask―what does it mean to write a poem as a last will and testament? Full article
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10 pages, 239 KiB  
Article
Strategic HIV Case Findings among Infants at Different Entry Points of Health Facilities in Cameroon: Optimizing the Elimination of Mother-To-Child Transmission in Low- and- Middle-Income Countries
by Celine Nguefeu Nkenfou, Georges Nguefack-Tsague, Aubin Joseph Nanfack, Sylvie Agnes Moudourou, Marie-Nicole Ngoufack, Leaticia-Grace Yatchou, Elise Lobe Elong, Joel-Josephine Kameni, Aline Tiga, Rachel Kamgaing, Nelly Kamgaing, Joseph Fokam and Alexis Ndjolo
Viruses 2024, 16(5), 752; https://doi.org/10.3390/v16050752 (registering DOI) - 10 May 2024
Abstract
Background: HIV case finding is an essential component for ending AIDS, but there is limited evidence on the effectiveness of such a strategy in the pediatric population. We sought to determine HIV positivity rates among children according to entry points in Cameroon. Methods: [...] Read more.
Background: HIV case finding is an essential component for ending AIDS, but there is limited evidence on the effectiveness of such a strategy in the pediatric population. We sought to determine HIV positivity rates among children according to entry points in Cameroon. Methods: A facility-based survey was conducted from January 2015 to December 2019 among mother–child couples at various entry points of health facilities in six regions of Cameroon. A questionnaire was administered to parents/guardians. Children were tested by polymerase chain reaction (PCR). Positivity rates were compared between entry points. Associations were quantified using the unadjusted positivity ratio (PR) for univariate analyses and the adjusted positivity ratio (aPR) for multiple Poisson regression analyses with 95% confidence intervals (CIs). p-values < 0.05 were considered significant. Results: Overall, 24,097 children were enrolled. Among them, 75.91% were tested through the HIV prevention of mother-to-child transmission (PMTCT) program, followed by outpatient (13.27%) and immunization (6.27%) services. In total, PMTCT, immunization, and outpatient services accounted for 95.39% of children. The overall positivity was 5.71%, with significant differences (p < 0.001) between entry points. Univariate analysis showed that inpatient service (PR = 1.45; 95% CI: [1.08, 1.94]; p = 0.014), infant welfare (PR = 0.43; 95% CI: [0.28, 0.66]; p < 0.001), immunization (PR = 0.56; 95% CI: [0.45, 0.70]; p < 0.001), and PMTCT (PR = 0.41; 95% CI: [0.37, 0.46]; p < 0.001) were associated with HIV transmission. After adjusting for other covariates, only PMTCT was associated with transmission (aPR = 0.66; 95% CI: [0.51, 0.86]; p = 0.002). Conclusions: While PMTCT accounts for most tested children, high HIV positivity rates were found among children presenting at inpatient, nutrition, and outpatient services and HIV care units. Thus, systematic HIV testing should be proposed for all sick children presenting at the hospital who have escaped the PMTCT cascade. Full article
(This article belongs to the Special Issue Mother to Child Transmission of Viral Infections)
25 pages, 816 KiB  
Systematic Review
The Impact of Resilience Interventions on University Students’ Mental Health and Well-Being: A Systematic Review
by Ghalib G. Abulfaraj, Rebecca Upsher, Helena M. S. Zavos and Eleanor J. Dommett
Educ. Sci. 2024, 14(5), 510; https://doi.org/10.3390/educsci14050510 (registering DOI) - 10 May 2024
Abstract
Attending university is a time of considerable change, and there are rising concerns about the mental health and well-being of university students, leading to calls for a whole-university approach to student support. Resilience interventions offer an opportunity to improve mental health and well-being, [...] Read more.
Attending university is a time of considerable change, and there are rising concerns about the mental health and well-being of university students, leading to calls for a whole-university approach to student support. Resilience interventions offer an opportunity to improve mental health and well-being, whilst also developing a much sought-after graduate attribute. We conducted a systematic review of interventions designed to increase university students’ levels of resilience and examined the impact of these on students’ mental health and well-being. Five databases identified 1377 unique records, 47 of which were eligible for inclusion. Eligible studies were drawn from a range of countries and adopted different designs, with the most common being the randomised controlled trial (RCT). Interventions were classified into mindfulness, skills-based, psychoeducation, and coaching, with delivery both online and face-to-face. The most common outcomes were depression, anxiety, stress, and well-being. The ‘Quality Assessment Tool for Before-After (Pre-/Post) Studies’ was used to assess the risk of bias with most studies rated as fair. Overall, the studies indicated that there is little evidence of a positive effect on depression, but stress and anxiety may be reduced following interventions. Well-being data were inconclusive. Interestingly, most interventions did not impact measures of resilience or mindfulness, despite the training targeting these constructs. The available research is currently limited and there is a need for more high-quality designs providing descriptions of interventions. Full article
(This article belongs to the Section Higher Education)
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14 pages, 273 KiB  
Article
Do Societies Have Emotions?
by Abilio Almeida
Societies 2024, 14(5), 65; https://doi.org/10.3390/soc14050065 (registering DOI) - 10 May 2024
Abstract
In recent decades, there has been a growing interest in the study of emotions, demonstrating their importance in understanding diverse human and social dynamics. However, as this field of study develops and diversifies, a structural yet simple question remains virtually undiscussed: Is it [...] Read more.
In recent decades, there has been a growing interest in the study of emotions, demonstrating their importance in understanding diverse human and social dynamics. However, as this field of study develops and diversifies, a structural yet simple question remains virtually undiscussed: Is it really possible to say that societies possess emotions or a certain sensitivity akin to individual experiences? This exploratory study, based on documentary analysis, endeavours to identify and examine emotional patterns across six different periods, spanning from the Middle Ages to the present day. Among the eight secondary findings, three fundamental conclusions stand out: (1) throughout history, societies have experienced different emotional atmospheres, sometimes simultaneously; (2) although societies generally propose an emotional model to follow, the reality does not always conform to it; and (3) it is mainly through the culture that society creates a certain emotional harmony, allowing the social body to remain cohesive and develop, thus postponing or preventing its disintegration. This study aims to offer a modest contribution to the complex and under-explored discussion on the correlation between specific emotional climates and particular social contexts. Full article
17 pages, 1240 KiB  
Article
Water-Use Characteristics of Wheat–Maize Rotation System as Affected by Nitrogen Application Rate in North China Plain
by Jingtao Qin, Xichao Fan, Xiaosen Wang, Mingliang Jiang and Mouchao Lv
Agronomy 2024, 14(5), 1006; https://doi.org/10.3390/agronomy14051006 (registering DOI) - 10 May 2024
Abstract
Reducing the nitrogen (N) application rate and improving water-use efficiency (WUE) are extremely important for sustainable agricultural development in wheat–maize rotation systems in the North China Plain (NCP). We conducted a three-year experiment to investigate the effects of the N application rate on [...] Read more.
Reducing the nitrogen (N) application rate and improving water-use efficiency (WUE) are extremely important for sustainable agricultural development in wheat–maize rotation systems in the North China Plain (NCP). We conducted a three-year experiment to investigate the effects of the N application rate on the water-use characteristics of wheat–maize rotation systems in the NCP. The experiment consisted of four N application rates: 250, 167, 84, and 0 kg hm−2, denoted by N3, N2, N1, and N0, respectively. The results showed the following: For the 0–60 cm soil layer, N deficiency could lead to reduced soil water use (SWU) in wheat seasons, but in maize seasons, N deficiency showed no significant effects on SWU in the 0–60 cm layer. For the 60–140 cm soil layer, N deficiency could lead to reduced SWU in wheat seasons, but in maize seasons, the effects of N deficiency on SWU in the 60–140 cm layer varied with the SWC in the 0–60 cm layer. Throughout the three-year experiment, the evapotranspiration (ET), leaf area index (LAI), yield, and WUE of plants receiving low N treatments decreased with the growing season due to the negative effects of low N treatment (N1 and N0) on the soil. The LAI, total ET, grain yield, and WUE were all positively correlated with each other for both wheat and maize. Considering grain yield and WUE, a single-season N application rate of 167 kg hm−2 (N2 treatment) in the NCP could meet the growth needs of the wheat–maize rotation system. Full article
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13 pages, 678 KiB  
Article
CSN1S1, CSN3 and LPL: Three Validated Gene Polymorphisms Useful for More Sustainable Dairy Production in the Mediterranean River Buffalo
by Alfredo Pauciullo, Giustino Gaspa, Yi Zhang, Qingyou Liu and Gianfranco Cosenza
Animals 2024, 14(10), 1414; https://doi.org/10.3390/ani14101414 - 9 May 2024
Abstract
The search for DNA polymorphisms useful for the genetic improvement of dairy farm animals has spanned more than 40 years, yielding relevant findings in cattle for milk traits, where the best combination of alleles for dairy processing has been found in casein genes [...] Read more.
The search for DNA polymorphisms useful for the genetic improvement of dairy farm animals has spanned more than 40 years, yielding relevant findings in cattle for milk traits, where the best combination of alleles for dairy processing has been found in casein genes and in DGAT1. Nowadays, similar results have not yet been reached in river buffaloes, despite the availability of advanced genomic technologies and accurate phenotype records. The aim of the present study was to investigate and validate the effect of four single nucleotide polymorphisms (SNP) in the CSN1S1, CSN3, SCD and LPL genes on seven milk traits in a larger buffalo population. These SNPs have previously been reported to be associated with, or affect, dairy traits in smaller populations often belonging to one farm. A total of 800 buffaloes were genotyped. The following traits were individually recorded, monthly, throughout each whole lactation period from 2010 to 2021: daily milk yield (dMY, kg), protein yield (dPY, kg) and fat yield (dFY, kg), fat and protein contents (dFP, % and dPP, %), somatic cell count (SCC, 103 cell/mL) and urea (mg/dL). A total of 15,742 individual milk test day records (2496 lactations) were available for 680 buffalo cows, with 3.6 ± 1.7 parities (from 1 to 13) and an average of 6.1 ± 1.2 test day records per lactation. Three out four SNPs in the CSN1S1, CSN3 and LPL genes were associated with at least one of analyzed traits. In particular, the CSN1S1 (AJ005430:c.578C>T) gave favorable associations with all yield traits (dMY, p = 0.022; dPY, p = 0.014; dFY, p = 0.029) and somatic cell score (SCS, p = 0.032). The CSN3 (HQ677596: c.536C>T) was positively associated with SCS (p = 0.005) and milk urea (p = 0.04). Favorable effects on daily milk yield (dMY, p = 0.028), fat (dFP, p = 0.027) and protein (dPP, p = 0.050) percentages were observed for the LPL. Conversely, the SCD did not show any association with milk traits. This is the first example of a confirmation study carried out in the Mediterranean river buffalo for genes of economic interest in the dairy field, and it represents a very important indication for the preselection of young bulls destined for breeding programs aimed at more sustainable dairy production. Full article
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14 pages, 21843 KiB  
Article
Effect of Polymer and Crosslinker Concentration on Static and Dynamic Gelation Behavior of Phenolic Resin Hydrogel
by Wenjuan Ji, Bei Chang, Haiyang Yu, Yilin Li and Weiqiang Song
Gels 2024, 10(5), 325; https://doi.org/10.3390/gels10050325 - 9 May 2024
Abstract
The application results of profile control and water plugging technology are highly related to the gelation time and strength of phenolic resin hydrogel. In this work, a hydrogel solution was prepared by fully mixing the prepared polymer solution with a crosslinker. The static [...] Read more.
The application results of profile control and water plugging technology are highly related to the gelation time and strength of phenolic resin hydrogel. In this work, a hydrogel solution was prepared by fully mixing the prepared polymer solution with a crosslinker. The static gelation process of PFR hydrogel in ampoule bottles and porous media was analyzed by changes in the viscosity and residual resistance coefficient. Then, the dynamic gelation of the PFR hydrogel in porous media was tested using a circulating flow device, and the changes in viscosity and injection pressure were analyzed during the dynamic gelation process. Finally, the effects of the polymer concentration and crosslinker concentration on dynamic gelation were analyzed. The initial gelation time and final gelation time in porous media were 1–1.5 times and 1.5–2 times those in ampoule bottles under static conditions, respectively. The initial dynamic gelation time in porous media was 2–2.5 times and 1.5–2 times the initial static gelation times in ampoule bottles and porous media, respectively. The final dynamic gelation time was four times and two times the initial static gelation times in ampoule bottles and porous media, respectively. The production after dynamic gelation in porous media comprised hydrogel aggregates and water fluid, leading to a high injection pressure and low viscosity of the produced liquid. As the concentration of polymer and crosslinker increased, the dynamic gelation time was shortened and the gel strength was increased. In the dynamic gelation process in porous media, the phenol resin hydrogel could migrate deeply, but it was limited by the concentrations of the polymer and crosslinker. The results of subsequent water flooding showed that the polymer hydrogel had a good plugging ability after dynamic gelation. The deep reservoir could only be blocked off in the subsequent water flooding process when the migration of hydrogel happened in the dynamic gelation process. Full article
(This article belongs to the Special Issue Gels for Oil and Gas Industry Applications (2nd Edition))
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25 pages, 3997 KiB  
Article
Electric Susceptibility at Partial Coverage of a Circular One-Side Access Capacitive Sensor with Rigid Polyurethane Foams
by Ilze Beverte
Sensors 2024, 24(10), 3003; https://doi.org/10.3390/s24103003 - 9 May 2024
Abstract
The capability of dielectric measurements was significantly increased with the development of capacitive one-side access physical sensors. Complete samples give no opportunity to study electric susceptibility at a partial coverage of the one-side access sensor’s active area; therefore, partial samples are proposed. The [...] Read more.
The capability of dielectric measurements was significantly increased with the development of capacitive one-side access physical sensors. Complete samples give no opportunity to study electric susceptibility at a partial coverage of the one-side access sensor’s active area; therefore, partial samples are proposed. The electric susceptibility at the partial coverage of a circular one-side access sensor with cylinders and shells is investigated for polyurethane materials. The implementation of the relative partial susceptibility permitted us to transform the calculated susceptibility data to a common scale of 0.0–1.0 and to outline the main trends for PU materials. The partial susceptibility, relative partial susceptibility, and change rate of relative partial susceptibility exhibited dependence on the coverage coefficient of the sensor’s active area. The overall character of the curves for the change rate of the relative partial susceptibility, characterised by slopes of lines and the ratio of the change rate in the centre and near the gap, corresponds with the character of the surface charge density distribution curves, calculated from mathematical models. The elaborated methods may be useful in the design and optimization of capacitive OSA sensors of other configurations of electrodes, independent of the particular technical solution. Full article
(This article belongs to the Special Issue Sensors in 2024)
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11 pages, 4591 KiB  
Article
Assessment of Key Factors Impacting Variability in AAV Vector Genome Titration by Digital PCR
by Guangyu Wang, Qiang Ma, Changlong Wei, Lei Yu, Hua Bi, Jing Jin, Xi Qin, Yong Zhou and Junzhi Wang
Int. J. Mol. Sci. 2024, 25(10), 5149; https://doi.org/10.3390/ijms25105149 - 9 May 2024
Abstract
Recombinant adeno-associated virus (rAAV) has emerged as a prominent vector for in vivo gene therapy, owing to its distinct advantages. Accurate determination of the rAAV genome titer is crucial for ensuring the safe and effective administration of clinical doses. The evolution of the [...] Read more.
Recombinant adeno-associated virus (rAAV) has emerged as a prominent vector for in vivo gene therapy, owing to its distinct advantages. Accurate determination of the rAAV genome titer is crucial for ensuring the safe and effective administration of clinical doses. The evolution of the rAAV genome titer assay from quantitative PCR (qPCR) to digital PCR (dPCR) has enhanced accuracy and precision, yet practical challenges persist. This study systematically investigated the impact of various operational factors on genome titration in a single-factor manner, aiming to address potential sources of variability in the quantitative determination process. Our findings revealed that a pretreatment procedure without genome extraction exhibits superior precision compared with titration with genome extraction. Additionally, notable variations in titration results across different brands of dPCR instruments were documented, with relative standard deviation (RSD) reaching 23.47% for AAV5 and 11.57% for AAV8. Notably, optimal operations about DNase I digestion were identified; we thought treatment time exceeding 30 min was necessary, and there was no need for thermal inactivation after digestion. And we highlighted that thermal capsid disruption before serial dilution substantially affected AAV genome titers, causing a greater than ten-fold decrease. Conversely, this study found that additive components of dilution buffer are not significant contributors to titration variations. Furthermore, we found that repeated freeze–thaw cycles significantly compromised AAV genome titers. In conclusion, a comprehensive dPCR titration protocol, incorporating insights from these impact factors, was proposed and successfully tested across multiple serotypes of AAV. The results demonstrate acceptable variations, with the RSD consistently below 5.00% for all tested AAV samples. This study provides valuable insights to reduce variability and improve the reproducibility of AAV genome titration using dPCR. Full article
(This article belongs to the Section Molecular Biology)
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27 pages, 5400 KiB  
Article
Sulforaphane Exposure Prevents Cadmium-Induced Toxicity and Mitochondrial Dysfunction in the Nematode Caenorhabditis elegans by Regulating the Insulin/Insulin-like Growth Factor Signaling (IIS) Pathway
by Estefani Yaquelin Hernández-Cruz, Omar Emiliano Aparicio-Trejo, Dianelena Eugenio-Pérez, Elí Juárez-Peredo, Mariana Zurita-León, Víctor Julián Valdés and José Pedraza-Chaverri
Antioxidants 2024, 13(5), 584; https://doi.org/10.3390/antiox13050584 (registering DOI) - 9 May 2024
Abstract
Cadmium (Cd) is a heavy metal that is highly toxic to humans and animals. Its adverse effects have been widely associated with mitochondrial alterations. However, there are not many treatments that target mitochondria. This study aimed to evaluate the impact of sulforaphane (SFN) [...] Read more.
Cadmium (Cd) is a heavy metal that is highly toxic to humans and animals. Its adverse effects have been widely associated with mitochondrial alterations. However, there are not many treatments that target mitochondria. This study aimed to evaluate the impact of sulforaphane (SFN) pre-exposure against cadmium chloride (CdCl2)-induced toxicity and mitochondrial alterations in the nematode Caenorhabditis elegans (C. elegans), by exploring the role of the insulin/insulin-like growth factor signaling pathway (IIS). The results revealed that prior exposure to SFN protected against CdCl2-induced mortality and increased lifespan, body length, and mobility while reducing lipofuscin levels. Furthermore, SFN prevented mitochondrial alterations by increasing mitochondrial membrane potential (Δψm) and restoring mitochondrial oxygen consumption rate, thereby decreasing mitochondrial reactive oxygen species (ROS) production. The improvement in mitochondrial function was associated with increased mitochondrial mass and the involvement of the daf-16 and skn-1c genes of the IIS signaling pathway. In conclusion, exposure to SFN before exposure to CdCl2 mitigates toxic effects and mitochondrial alterations, possibly by increasing mitochondrial mass, which may be related to the regulation of the IIS pathway. These discoveries open new possibilities for developing therapies to reduce the damage caused by Cd toxicity and oxidative stress in biological systems, highlighting antioxidants with mitochondrial action as promising tools. Full article
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14 pages, 2234 KiB  
Brief Report
Effect of Biologger Attachment on the Stress and Health State of the Spotted Sea Bass Lateolabrax maculatus
by Sung-Yong Oh, Jun-Ho Maeng and Han-Seung Kang
J. Mar. Sci. Eng. 2024, 12(5), 793; https://doi.org/10.3390/jmse12050793 - 9 May 2024
Abstract
The biologger is a widely used tool in biotelemetry for investigating marine fish. However, studies reported that the attachment of biologgers has a negative effect on the target organisms. We assessed the health status of spotted sea bass with attached biologgers by analyzing [...] Read more.
The biologger is a widely used tool in biotelemetry for investigating marine fish. However, studies reported that the attachment of biologgers has a negative effect on the target organisms. We assessed the health status of spotted sea bass with attached biologgers by analyzing changes in their serum biochemistry and biomarker gene expression at varying biologger/fish body weight ratios. Especially, the assessment of the health status using biomarker genes offers the rapid evaluation of the condition of an individual. The genes bax, hsp70-2, and Cx32.7, associated with apoptosis, stress, and immunity, were selected as biomarker genes to assess the fish stress levels and overall health. The experimental groups included a control group without the biologger (C) and biologger-equipped groups, each carrying a biologger whose weight was 2.0–3.0% (W2), 5.0–6.0% (W5), and 10.0–12.0% (W10) of the fish body weight. Blood samples were collected on days 0, 1, 7, 14, and 21 post-attachment. The expression of bax, hsp70-2, and Cx32.7 was analyzed in the liver and muscle on day 21. The W10 group showed significantly higher levels of superoxide dismutase on day 1 and of glutamic oxaloacetic transaminase and glutamic pyruvic transaminase on day 7 than the other groups. On day 21 post-attachment, regardless of the biologger/fish body weight ratio, the liver and muscle tissues from groups W2, W5, and W10 showed significantly higher expression of bax, hsp70-2, and Cx32.7 than those from group C, respectively. However, there was no significant change in blood parameters depending on the weight of the attached biologger on day 21 post-attachment. These results indicate that the spotted sea bass gradually adapted to the attached biologgers of weights up to 10–12% of their body weight under our experimental conditions, providing clues to determine the timing of biologger release for biotelemetry studies. Full article
(This article belongs to the Section Marine Biology)
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15 pages, 3338 KiB  
Review
The Role of the Heterogeneous Catalyst to Produce Solketal from Biodiesel Waste: The Key to Achieve Efficiency
by Catarina N. Dias, Alexandre M. Viana, Luís Cunha-Silva and Salete S. Balula
Nanomaterials 2024, 14(10), 828; https://doi.org/10.3390/nano14100828 - 9 May 2024
Abstract
The valorization of the large amount of crude glycerol formed from the biodiesel industry is of primordial necessity. One possible direction with high interest to the biorefinery sector is the production of fuel additives such as solketal, through the acetalization of glycerol with [...] Read more.
The valorization of the large amount of crude glycerol formed from the biodiesel industry is of primordial necessity. One possible direction with high interest to the biorefinery sector is the production of fuel additives such as solketal, through the acetalization of glycerol with acetone. This is a chemical process that conciliates high sustainability and economic interest, since solketal contributes to the fulfillment of a Circular Economy Model through its use in biodiesel blends. The key to guarantee high efficiency and high sustainability for solketal production is the use of recovery and recyclable heterogeneous catalysts. Reported works indicate that high yields are attributed to catalyst acidity, mainly the ones containing Brönsted acidic sites. On the other hand, the catalyst stability and its recycling capacity are completely dependent of the support material and the acidic sites incorporation methodology. This review intends to conciliate the information spread on this topic and indicate the most assertive strategies to achieve high solketal production in short reaction time during various reaction cycles. Full article
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13 pages, 4524 KiB  
Article
A Highly Sensitive Molecular Technique for RNA Virus Detection
by Tomasz Rozmyslowicz, Haruki Arévalo-Romero, Dareus O. Conover, Ezequiel M. Fuentes-Pananá, Moisés León-Juárez and Glen N. Gaulton
Cells 2024, 13(10), 804; https://doi.org/10.3390/cells13100804 - 9 May 2024
Abstract
Zika (ZIKV) and Chikungunya (CHIKV) viruses are mosquito-transmitted infections, or vector-borne pathogens, that emerged a few years ago. Reliable diagnostic tools for ZIKV and CHIKV—inexpensive, multiplexed, rapid, highly sensitive, and specific point-of-care (POC) systems—are vital for appropriate risk management and therapy. We recently [...] Read more.
Zika (ZIKV) and Chikungunya (CHIKV) viruses are mosquito-transmitted infections, or vector-borne pathogens, that emerged a few years ago. Reliable diagnostic tools for ZIKV and CHIKV—inexpensive, multiplexed, rapid, highly sensitive, and specific point-of-care (POC) systems—are vital for appropriate risk management and therapy. We recently studied a detection system with great success in Mexico (Villahermosa, state of Tabasco), working with human sera from patients infected with those viruses. The research conducted in Mexico validated the efficacy of a novel two-step rapid isothermal amplification technique (RAMP). This approach, which encompasses recombinase polymerase amplification (RPA) followed by loop-mediated isothermal amplification (LAMP), had been previously established in the lab using lab-derived Zika (ZIKV) and Chikungunya (CHIKV) viruses. Crucially, our findings confirmed that this technique is also effective when applied to human sera samples collected from locally infected individuals in Mexico. Full article
(This article belongs to the Section Cell Methods)
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8 pages, 2678 KiB  
Communication
Mindfulness in Facilitating Pelvic Floor Botulinum Toxin Injection in Women with Chronic Pelvic Pain
by Jacqueline V. Aredo, Hannah K. Tandon, Samin Panahi, Vy T. Phan, Rezvan Ameli, Barbara I. Karp and Pamela Stratton
Toxins 2024, 16(5), 216; https://doi.org/10.3390/toxins16050216 - 9 May 2024
Abstract
Botulinum toxin (BoNT) injection can safely be done as an office-based procedure, but can be painful itself, especially when injecting pelvic floor muscles to treat chronic pelvic pain (CPP). Mindfulness interventions may reduce procedure-associated acute anxiety and pain. We applied mindfulness techniques to [...] Read more.
Botulinum toxin (BoNT) injection can safely be done as an office-based procedure, but can be painful itself, especially when injecting pelvic floor muscles to treat chronic pelvic pain (CPP). Mindfulness interventions may reduce procedure-associated acute anxiety and pain. We applied mindfulness techniques to increase the tolerability of office-based pelvic floor BoNT injections in women with CPP. Women enrolled in a clinical trial of BoNT for endometriosis-associated CPP were offered a brief, guided mindfulness session before and/or after transvaginal injection. Anxiety, pain, and dysphoria were rated on a 0–10 numerical rating scale (NRS) before and after each mindfulness session. Eight women underwent mindfulness sessions. Five participants had a session before and two after the transvaginal injection. One participant had two sessions: one before and one after separate injections. All six women completing a session prior to injection had at least moderate anxiety, which lessened after the mindfulness session (median NRS change: −3.3/10). All three women reporting injection-associated pain experienced less intense pain following the post-injection session (median NRS change: −3/10). Three women experiencing dysphoria improved after the session (median NRS change: −3/10). A brief, guided mindfulness session may lessen acute pain, anxiety, and dysphoria associated with office-based transvaginal BoNT injection. Full article
(This article belongs to the Special Issue Uses of Botulinum Toxin Injection in Medicine)
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25 pages, 3709 KiB  
Article
Data Acquisition, Processing, and Aggregation in a Low-Cost IoT System for Indoor Environmental Quality Monitoring
by Alberto Barbaro, Pietro Chiavassa, Virginia Isabella Fissore, Antonio Servetti, Erica Raviola, Gustavo Ramírez-Espinosa, Edoardo Giusto, Bartolomeo Montrucchio, Arianna Astolfi and Franco Fiori
Appl. Sci. 2024, 14(10), 4021; https://doi.org/10.3390/app14104021 - 9 May 2024
Abstract
The rapid spread of Internet of Things technologies has enabled a continuous monitoring of indoor environmental quality in office environments by integrating monitoring devices equipped with low-cost sensors and cloud platforms for data storage and visualization. Critical aspects in the development of such [...] Read more.
The rapid spread of Internet of Things technologies has enabled a continuous monitoring of indoor environmental quality in office environments by integrating monitoring devices equipped with low-cost sensors and cloud platforms for data storage and visualization. Critical aspects in the development of such monitoring systems are effective data acquisition, processing, and visualization strategies, which significantly influence the performance of the system both at monitoring device and at cloud platform level. This paper proposes novel strategies to address the challenges in the design of a complete monitoring system for indoor environmental quality. By adopting the proposed solution, one can reduce the data rate transfer between the monitoring devices and the server without loss of information, as well as achieve efficient data storage and aggregation on the server side to minimize retrieval times. Finally, enhanced flexibility in the dashboard for data visualization is obtained, thus enabling graph modifications without extensive coding efforts. The functionality of the developed system was assessed, with the collected data in good agreement with those from other instruments used as references. Full article
(This article belongs to the Special Issue Air Quality in Indoor Environments, 2nd Edition)
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11 pages, 2431 KiB  
Article
Secondary Analysis of Interstitial Cystitis/Bladder Pain Syndrome Patients Enrolled in a Recurrent Urinary Tract Infection Prevention Study Provides a Novel Paradigm for Etio-Pathogenesis and Practical Management of This Infection Phenotype
by J. Curtis Nickel, Tiziana Cotechini and R. Christopher Doiron
Pathogens 2024, 13(5), 396; https://doi.org/10.3390/pathogens13050396 (registering DOI) - 9 May 2024
Abstract
Introduction: A subset of interstitial cystitis/bladder pain syndrome (IC/BPS) patients experience recurrent urinary tract infection (rUTI) associated with symptom flares. Recurrent UTI subjects with associated IC/BPS were enrolled in the first North American early clinical experience trial evaluating a new sublingual UTI preventative [...] Read more.
Introduction: A subset of interstitial cystitis/bladder pain syndrome (IC/BPS) patients experience recurrent urinary tract infection (rUTI) associated with symptom flares. Recurrent UTI subjects with associated IC/BPS were enrolled in the first North American early clinical experience trial evaluating a new sublingual UTI preventative vaccine, MV140. It has been shown that women with rUTI develop an imbalance in the T helper 1 and 2 (Th2 over-expression) in the bladder mucosa. Our hypothesis-generating secondary analysis will suggest that this infection subcategory of IC/BPS patients develop a similar imbalance of Th1-Th2 response type to bacteria present in their urinary microbiome, leading to a bladder hypersensitivity that responds to mucosal immune modulation. Methods: Female participants with ≥3 documented UTI/year underwent a 3-month vaccination treatment period with a 9-month efficacy period after completion of vaccine treatment (total 12 months). There were no exclusion criteria for subjects in relation to baseline urinary symptoms and/or discomfort/pain. Primary outcome was no UTI following vaccination. Secondary outcomes included change in UTI incidence, overall patient-reported subjective global assessment (SGA responder defined as moderately or markedly improved on 7-point scale), and safety. Results: Sixteen subjects with IC/BPS-related symptoms and rUTI (mean age 47; range 23–74 years; mean number of UTI episodes in previous year 6.1 +/− 4.2) were eligible to be included in the Health Canada-approved MV140 vaccine study for prevention of rUTI. All subjects completed the 3-month vaccination period. One subject was lost to follow-up after their 6-month visit. Six subjects were UTI-free, while all 16 subjects had a reduction in UTI episodes compared to the year pre-vaccination. The total post-vaccination reduction in UTI episodes compared to pre-vaccination was 80% (0.1 UTI/subject/month from 0.5 UTI/subject/month, respectively). At 12 months, 13 subjects (81%) were SGA responders (moderately or markedly improved), and the responders reported a reduction in IC/BPS symptoms, with 8 subjects reporting significant or almost complete resolution of their specific long-term bladder discomfort/pain and bothersome urinary frequency or urgency. Four subjects reported mild and self-limited adverse events during vaccination period, but none were related to MV140 vaccine. Conclusion: Sublingual MV140 vaccine in IC/BPS patients with rUTI not only achieved UTI-free or reduced UTI incidence status but also, after approximately 9 months post vaccination, resolution of patients’ long-term treatment-refractory IC/BPS symptoms. This suggests some cases of IC/BPS may be etiologically based on Th2-driven hypersensitivity to bacteria within or entering the urinary microbiome that responds to a vaccine whose mechanism of action is to normalize or balance the bladder Th1/Th2 mucosal immune system. Full article
(This article belongs to the Section Bacterial Pathogens)
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14 pages, 2159 KiB  
Article
Economic Aspects of Zinc Oxide Fertilization in Yam (Dioscorea alata L.) in a Semi-Arid Region of Brazil
by Antônio Lourenço Bezerra, João Everthon da Silva Ribeiro, Ester dos Santos Coêlho, Elania Freire da Silva, Pablo Henrique de Almeida Oliveira, Gisele Lopes dos Santos, Antonio Gideilson Correia da Silva, José Travassos dos Santos Júnior, Ivanice da Silva Santos, Felipe Alves Reis, Lindomar Maria da Silveira, Aurélio Paes Barros Júnior and Adriano do Nascimento Simões
Horticulturae 2024, 10(5), 489; https://doi.org/10.3390/horticulturae10050489 - 9 May 2024
Abstract
The management and improvement of yam productivity are associated with a good supply of essential nutrients for the growth and development of the crop that has economic viability. This research aimed to evaluate the economic feasibility of foliar fertilization with Zintrac® in [...] Read more.
The management and improvement of yam productivity are associated with a good supply of essential nutrients for the growth and development of the crop that has economic viability. This research aimed to evaluate the economic feasibility of foliar fertilization with Zintrac® in two yam agricultural seasons (2022/2023 and 2023/2024). Therefore, two experiments were conducted at the Rafael Fernandes Experimental Farm, Mossoró, RN, Brazil. The experimental design was in a Latin square design with five treatments of doses of Zintrac® (0, 1, 2, 3, and 4 L ha−1) and five replications. Among the production costs of yams, labor and seed acquisition were the most significant. The highest profitability index was achieved with the dose of 1L Zintrac® ha−1 in the first season and second season, which corresponded to 78.97 and 57.86%. For the first season, increments were observed in all treatments that received zinc doses with increases of 48.70, 31.22, 14.30, and 15.93% for 1, 2, 3, and 4 L of Zintrac® ha−1 compared to the dose of 0 L ha−1. On the other hand, in the second season, there was an increase only in the dose of 1 L ha−1 of Zintrac®, which corresponded to 51.3% in the net yield (ha−1) of the dose of 0 L ha−1. Therefore, foliar zinc oxide fertilization was economically viable for the yam crop, obtaining higher economic indices at the dose of 1 L ha−1. The highest cost for growing yams is using a dose of 4 L ha−1 of Zintrac®, totaling USD 6977.59 (first season) and USD 6868.33 (second season) Full article
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