Search Results (41)

Brettanomyces bruxellensis has been described as the main spoilage microorganism in wines due to its ability to produce volatile phenols, which negatively impact the final product’s organoleptic properties. This yeast can grow and survive in environments that are too nutritionally poor and stressful for other microorganisms, and one of the stressful conditions it can endure is the high alcohol content in wine. In this study, cell wall morphology and the expression of some genes related to its composition were characterized under increasing ethanol concentrations to establish a possible ethanol resistance mechanism. B. bruxellensis LAMAP2480 showed greater resistance to β-1,3-glucanase activity when grown in media supplemented with 5% or 10% ethanol compared with the control assay (without ethanol). Transmission electron microscopy showed no significant differences in cell wall thickness during the different adaptation stages. However, the amount of wall polysaccharides and chitin briefly increased at 1% ethanol but returned to baseline at 5% and 10%. The amount of wall-associated protein increased progressively with each increment in ethanol concentration. In addition, overexpression of the ROM2 and KNR4/SMI1 genes was observed at 10% ethanol. These results suggest that the integrity of the cell wall might play an important role in the adaptation of B. bruxellensis to an ethanol-containing medium. Full article

Lithium (Li) metal’s exceptional low electrode potential and high specific capacity for next-gen energy storage devices make it a top contender. However, the unregulated and unpredictable proliferation of Li dendrites and the instability of interfaces during repeated Li plating and stripping cycles pose significant challenges to the widespread commercialization of Li metal anodes. We introduce the creation of a hydrogen bond network solid electrolyte interphase (SEI) film that integrates zwitterionic groups, designed to facilitate the stability and longevity of lithium metal batteries (LMBs). Here, we design a PVA/P(SBMA-MBA) hydrogen bond network film (PSM) as an artificial SEI, integrating zwitterions and polyvinyl alcohol (PVA) to synergistically regulate Li⁺ flux. The distinctive zwitterionic effect in the network amplifies the SEI film’s ionic conductivity to 1.14 × 10⁻⁴ S cm⁻¹ and attains an impressive Li⁺ ion transfer number of 0.84. In situ Raman spectroscopy reveals dynamic hydrogen bond reconfiguration under strain, endowing the SEI with self-adaptive mechanical robustness. These properties facilitate a homogeneous Li flux and exceptionally suppress dendritic growth. The advanced Li metal anode may endure over 1200 h at 1 mA cm⁻² current density and 1 mAh cm⁻² area capacity in a Li|Li symmetric battery. And in full cells paired with LiFePO₄ cathodes, 93.8% capacity retention is reached after 300 cycles at 1C. Consequently, this work provides a universal strategy for designing dynamic interphases through molecular dipole engineering, paving the way for safe and durable lithium metal batteries. Full article

Despite the potential of film dressings for wound healing, many formulations lack an optimized design in order to ensure that the ingredients were carefully chosen to increase the product’s efficacy and stability, while also ensuring the patient’s comfort during the treatment. Moreover, commercially available film dressings do not contain herbal extracts or other active substances with wound healing properties, highlighting a gap in the market and the need for further research in this direction. The aim of this work was the development and optimization of a bio-inspired formulation of a complex herbal extract-loaded film-dressing to be used in wound care, using the quality by design approach. After setting the quality target product profile with the critical quality attributes and undergoing the risk assessment, the design of experiments was implemented. All the selected ingredients were biodegradable, aligning with the current need for a natural approach, based on their biocompatibility and reduced environmental impact. A D-optimal experimental plan was used, in which the types and concentrations of film-forming agents and plasticizers were varied: xanthan gum, acacia gum, sodium carboxymethylcellulose and glycerol, 1,3-propanediol, and xylitol, respectively. All formulations contained polyvinyl alcohol and a previously studied complex herbal extract. The films were characterized in terms of uniformity of mass, film thickness, swelling degree, folding endurance, adhesive, and mechanical properties. The optimized formulation was achieved by maximizing the swelling degree, adhesive properties, hardness, deformation at target, and elongation at break. The optimized film was characterized, and the in vitro total polyphenolic content release from the film was evaluated. Following the understanding of the influences of the formulation factors on the film characteristics, the composition of the optimized film-dressing was determined as follows: 5% polyvinyl alcohol, 0.25% xanthan gum, 10% glycerol, and 20% complex herbal extract. The optimized film exhibited high swelling degree (627.28%), high adhesive properties (adhesive force of 28.00 g and adhesiveness of 0.20 mJ), high elasticity (deformation at target of 29.80%, and elongation at break of 106.90%), as well as good mechanical properties (hardness of 2616.00 g), which are suitable characteristics for use on wounds. Moreover, the optimized film-dressing exhibited a sustained release, with a maximum release of polyphenols of 88.00% after 8 h. Full article

Introduction: Smoking is a risk factor for chronic obstructive pulmonary disease (COPD) and lung cancer. In addition to pulmonary damages, peripheral muscle impairments are present in this population. Pulmonary limitation is observed in smokers before disease diagnosis, but functional capacity limitations are uncertain, contrary to patients who have already been diagnosed. The aim of this study was to compare muscular strength and endurance between non-smoker and smoker populations without any diagnosed respiratory disease. Method: This cross-sectional study assessed subjects without diagnosed respiratory disease in terms of physical capacity using two tests (one-minute sit-to-stand test (STST) and Jamar dynamometer test (JDT)). Results: The sample consisted of 147 subjects. The number of repetitions and the muscle strength were lower in the smoker than in the non-smoker population (28.5 ± 8.7 vs. 33.5 ± 8.2 (p < 0.001), and 38.2 ± 10.1 vs. 42.4 ± 10.5 (p = 0.04), respectively). The relative change in heart rate during STST was lower in the smokers compared to the non-smokers (p = 0.01). No significant differences were found based on gender. Conclusions: Smokers without alcohol or drug dependence and without diagnosed lung disease exhibit non-clinically but statistically reduced muscular strength and endurance. Their heart rate response to exercise is also reduced. Full article

PURPOSE: Job profiles such as heavy vehicle drivers and transportation office workers that involve prolonged static and inappropriate postures and forceful exertions often impact an individual’s health, leading to various disorders, most commonly musculoskeletal disorders (MSDs). In the present study, various individual risk factors, such as age, weight, height, BMI, sleep patterns, work experience, smoking status, and alcohol intake, were undertaken to see their influence on MSDs. METHODS: The modified version of the Nordic Questionnaire was administered in the present cross-sectional study to collect data from 48 heavy vehicle drivers and 40 transportation office workers. RESULTS: The analysis revealed low back pain (LBP), knee pain (KP), and neck pain (NP) to be the dominant pains suffered by the participants from both occupational groups. LBP, KP, and NP were suffered by 56%, 43.75%, and 39% heavy vehicle drivers and 47.5%, 40%, and 27.5% transport office workers, respectively. From the insignificant value of Chi-square, it can be inferred that the participants from both occupations experience similar levels of LBP, KP, and NP. The Bayesian model applied to the total sample showed that NP influenced KP, which further influenced the LBP of the workers. Age was predicted as LBP’s most significant risk factor by the logistic regression model when applied to the total sample, while NP was found to decrease with an increase in per unit sleep. CONCLUSIONS: The overall results concluded that heavy vehicle drivers and office workers, irrespective of their different job profiles, endured pain similarly. Full article

The prolonged consumption of D-galactose (Gal) has been associated with severe damage in the liver and brain via exacerbation of oxidative stress, non-enzymatic glycation, and the aging process. The current study was initiated for a comparative assessment of beeswax alcohol (BWA, final 0.5% and 1.0% w/w) and coenzyme Q₁₀ (CoQ₁₀, final 0.5% and 1.0% w/w) against high-cholesterol (HC, final 4%, w/w) and -galactose (Gal, final 30%, w/w)-induced adverse events in zebrafish during 24 weeks of consumption. The survivability of zebrafish decreased to 82.1% due to HC+Gal exposure, but this was substantially improved (91.0%) with the consumption of 0.5% and 1.0% BWA. In contrast, no protective effect of CoQ₁₀ consumption (1.0%) was observed on the survivability of zebrafish. Nevertheless, both BWA and CoQ₁₀ displayed a significant (p < 0.001) preventive effect against HC+Gal-induced body weight enhancement. The HC+Gal-induced cognitive changes, marked by staggered and confused swimming behavior, and retarded swimming speed and motion patterns (restricted to the bottom of the tank), were efficiently restored by BWA. A significantly higher residence time in the upper half of the tank, 3.1-and 4.5-fold reduced latency time along with 3.5-fold and 4.1-fold higher swimming distance, was logged in the 0.5% and 1.0% BWA groups, respectively, than the zebrafish that consumed HC+Gal. In addition, BWA effectively enhanced plasma ferric ion reduction (FRA) and paraoxonase (PON) activity and alleviated the total cholesterol (TC), triglyceride (TG), and blood glucose levels disrupted by the consumption of HC+Gal. Also, the HC+Gal-alleviated plasma high-density lipoprotein-cholesterol (HDL-C) was 2.6-fold (p < 0.001) enhanced in the group that consumed 1.0% BWA, which was significantly 1.5-fold (p < 0.001) better than the effect of 1.0% CoQ₁₀. Similarly, BWA displayed a superior impact over CoQ₁₀ to mitigate HC+Gal-induced plasma AST and ALT levels, hepatic IL-6 production, generation of oxidized species, cellular senescence, and fatty liver changes. Moreover, BWA protects the brain against HC+Gal-induced oxidative stress, apoptosis, and myelin sheath degeneration. Conclusively, compared to CoQ₁₀, BWA efficiently can the HC+Gal-impaired brain and liver functionality to subside and improves the dyslipidemia and cognitive behavior of zebrafish. Full article

Prenatal alcohol exposure (PAE) is associated with long-term neurodevelopmental deficits resulting in impaired executive functioning and motor control. Intriguingly, PAE has been linked with an increased risk of transient systemic hypoxia–ischemia (TSHI), which alone results in suboptimal fetal growth and neurodevelopmental consequences. Here, using two translationally relevant preclinical models, we investigated the short-term and lasting effects of PAE and TSHI on the morphology of the medial prefrontal cortex (mPFC), a region important in executive function, and tested whether PAE interacts with TSHI to produce a distinct pattern of injury relative to either condition alone. The four experimental groups included sham (saccharin water, no TSHI), PAE (5% alcohol, no TSHI), TSHI (saccharin water, TSHI), and PAE+TSHI (5% alcohol, TSHI). Brains were extracted for Golgi–Cox staining at Postnatal Day 35 (P35) or P100 and processed for 3D Sholl analysis. The analysis of the mPFC at P35 showed no significant differences in the number of branches or dendritic length overall, although the impact of TSHI compared to alcohol was significant for both. There were no significant differences in the number of Sholl intersections overall at P35, although a sex difference was noted in PAE offspring. At P100, analysis of filament dendritic length and branching number was also significantly impacted by TSHI compared to alcohol. Interestingly, sex was also a significant factor when assessing the impact of alcohol. PAE and TSHI both had an insignificantly increased number of Sholl intersections at P100 compared to the control. The observed changes to dendritic complexity at P100 demonstrate altered neuronal morphology in the mPFC that endure into adulthood. Given the importance of the mPFC in executive functioning, these pilot data provide insight into morphological changes that may contribute to the neurobehavioral deficits observed following exposure to PAE and TSHI and highlight the need for additional investigations into this area. Full article

Background: The COVID-19 pandemic significantly impacted mental health and substance use patterns, particularly among young adults. Objective: This study aimed to assess changes in anxiety, depression, self-esteem, and substance use among university students in Mexico before, during, and after the pandemic. Methods: Using a repeated cross-sectional design, this study was conducted with university students in Mexico across three periods: pre-pandemic (2017 and 2019); during the pandemic (2021); and post-pandemic (2023). A total of 2167 students were interviewed during one of the three periods. Standardized scales measured anxiety, depression, self-esteem, Erotic Response and Sexual Orientation Scale (EROS), and substance use. Results: showed a marked and significant increase in the proportion of students with anxiety (40.0%, 71.7%, and 79.6%) and depression (14.4%, 61.9%, and 62.6%) during the pre-pandemic, pandemic, and post-pandemic periods, respectively. Self-esteem significantly decreased during and after the pandemic, compared to pre-pandemic, particularly among females. The proportion of students categorized as moderate/high-risk for their substance use changed over time, showing a reduction in alcohol use (from 29.9% to 20.2%) and tobacco use (from 26.0% to 18.2%) but an increase in sedative use (from 7.1% to 11.7%), before vs after the pandemic, respectively. Multivariate analysis revealed that anxiety, low self-esteem, and increased sedative use were consistently linked to a heightened risk of depression during and after the pandemic. Notably, anxiety and depression levels remained in a proportion significantly elevated even in the post-pandemic period. Conclusions: These findings underscore the enduring impact of the COVID-19 pandemic on the mental health of university students, highlighting the urgent need for targeted interventions, early detection strategies, and customized educational programs to effectively support students’ mental well-being in the ongoing post-pandemic era. Full article

Self-healing hydrogels have good mechanical strength, can endure greater external force, and have the ability to heal independently, resulting in a strong bond between the wound and the material. Bacterial biofilm infections are life-threatening. Clindamycin (Cly) can be produced in the form of a self-healing hydrogel preparation. It is noteworthy that the antibacterial self-healing hydrogels show great promise as a wound dressing for bacterial biofilm infection. In this study, we developed a polyvinyl alcohol/borax (PVA/B) self-healing hydrogel wound dressing that releases Cly. Four ratios of PVA, B, and Cly were used to make self-healing hydrogels: F1 (4%:0.8%:1%), F2 (4%:1.2%:1%), F3 (1.6%:1%), and F4 (4%:1.6%:0). The results showed that F4 had the best physicochemical properties, including a self-healing duration of 11.81 ± 0.34 min, swelling ratio of 85.99 ± 0.12%, pH value of 7.63 ± 0.32, and drug loading of 98.34 ± 11.47%. The B–O–C cross-linking between PVA and borax caused self-healing, according to FTIR spectra. The F4 formula had a more equal pore structure in the SEM image. The PVA/B-Cly self-healing hydrogel remained stable at 6 ± 2 °C for 28 days throughout the stability test. The Korsmeyer–Peppas model released Cly by Fickian diffusion. In biofilm-infected mouse wounds, PVA/B-Cly enhanced wound healing and re-epithelialization. Our results indicate that the PVA/B-Cly produced in this work has reliable physicochemical properties for biofilm-infected wound therapy. Full article

Antibacterial hydrogels have attracted significant attention due to their diverse applications, efficient antimicrobial properties, and adaptability to various environments and requirements. However, their relatively fragile structure, coupled with the potential for environmental toxicity when exposed to their surroundings for extended periods, may significantly limit their practical application potential. In this work, a composite hydrogel was synthesized with outstanding mechanical features and antibacterial capability. The hydrogel was developed through the combination of the eco-friendly and enduring antibacterial agent, lignin silver nanoparticles (Lig-Ag NPs), with polyvinyl alcohol (PVA) and sodium alginate (SA), in varying proportions. The successful synthesis of the hydrogel and the dispersed distribution of Lig-Ag NPs within the hydrogel were confirmed by various analytical techniques, including field emission scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), mercury intrusion porosimetry (MIP), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The formation of multiple hydrogen bonds between Lig-Ag NPs and the composites contributed to a more stable and dense network structure of the hydrogel, consequently enhancing its mechanical properties. Rheological tests revealed that the hydrogel exhibited an elastic response and demonstrated outstanding self-recovery properties. Significantly, the antibacterial hydrogel demonstrated effectiveness against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), achieving a <5% survival of bacteria within 12 h. This study presented a green and straightforward synthetic strategy for the application of antibacterial composite hydrogels in various fields. Full article

Poly(vinyl alcohol) (PVA) physical cryogels that contained the additives of o-, m-, and p-bis-phenols or phenol were prepared, and their physico-chemical characteristics and macroporous morphology and the solute release dynamics were evaluated. These phenolic additives caused changes in the viscosity of initial PVA solutions before their freeze–thaw processing and facilitated the growth in the rigidity of the resultant cryogels, while their heat endurance decreased. The magnitude of the effects depended on the interposition of phenolic hydroxyls in the molecules of the used additives and was stipulated by their H-bonding with PVA OH-groups. Subsequent rinsing of such “primary” cryogels with pure water led to the lowering of their rigidity. The average size of macropores inside these heterophase gels also depended on the additive type. It was found also that the release of phenolic substances from the additive-containing cryogels occurred via virtually a free diffusion mechanism; therefore, drug delivery systems such as PVA cryogels loaded with either pyrocatechol, resorcinol, hydroquinone, or phenol, upon the in vitro agar diffusion tests, exhibited antibacterial activity typical of these phenols. The promising biomedical potential of the studied nanocomposite gel materials is supposed. Full article

In the present study, the results of an experimental work on the thermal endurance and decomposition products of the commercial restorative adhesive Loctite^® Super Attak Glass, being applied on glass surfaces, are presented. The clarity of the cyanoacrylate polymer and its rapid anionic polymerization reaction are outcomes of the chemistry of the monomer and its activity. First, evaluation of the reversibility of this glue was examined through the solubility tests. It was verified that the adhesive is reversible since it is diluted in several solvents. Later, by applying pyrolysis conjugated with gas chromatography and mass spectrometry (Py–GC/MS), the thermal profile of the polymer is recorded in its neat form and in its aged state (weathered under the influence of UV-irradiation or thermal treatment at 50 and 75 °C). The decomposition products are detected and identified and, finally, possible reactions are investigated. Emphasis is placed on those that could be considered harmful to cultural heritage materials and objects. The fragments by the pyrolytic reactions identified mainly concern esters, less aldehydes and alcohols, small nitrogen compounds, and in some cases unsaturated hydrocarbons with higher molecular weight. Additives such as radical polymerization inhibitors and stabilizers, as well as some plasticizers, were also detected. Full article

Physical macroporous poly(vinyl alcohol)-based cryogels formed by the freeze–thaw technique without the use of any foreign cross-linkers are of significant interests for biomedical applications. In the present study, such gel materials loaded with the antimicrobial substances were prepared and their physicochemical properties were evaluated followed by an assessment of their potential to serve as drug carriers that can be used as implants for the treatment of infected wounds. The antibiotic Ceftriaxone and the antimycotic Fluconazole were used as antimicrobial agents. It was shown that the Ceftriaxone additives caused the up-swelling effects with respect to the cryogel matrix and some decrease in its heat endurance but did not result in a substantial change in the gel strength. With that, the drug release from the cryogel vehicle occurred without any diffusion restrictions, which was demonstrated by both the spectrophotometric recording and the microbiological agar diffusion technique. In turn, the in vivo biotesting of such drug-loaded cryogels also showed that these materials were able to function as rather efficient antimicrobial implants injected in the artificially infected model wounds of laboratory rabbits. These results confirmed the promising biomedical potential of similar implants. Full article

Background: The city-wide COVID-19 lockdown has resulted in psychological anguish, which may have an impact on dietary consumption. This study’s dual goals are to show how Chinese food consumption was altered before and after the lockdown, and to examine the nutrient density for the psychologically affected group. Methods: A cross-sectional study involving 652 people from Mainland China, Taiwan, and Macao was conducted with the aid of a web-based questionnaire. Sociodemographic characteristics, related environmental factors, nutrient consumption, food recommendations, and psychological distress were all measured. 516 trustworthy data revealed that two nutrient-poor foods were consumed less frequently during the lockdown than they were before to the COVID-19 outbreak (i.e., salty snacks and alcoholic beverages). People who endured high levels of psychological distress in particular tended to consume more. Particularly, those who experienced high levels of psychological distress had a tendency to consume far more alcohol than people who only experienced low levels of stress. Comparing the time before the COVID-19 to the present, there has statistically been an increase in the frequency of family members recommending diets. According to research, by food advice, individuals who experience psychological distress should consume more nutrient-dense foods (78.7%) than nutrient-poor ones (61.9%). Thus, food advice plays a role in mediating the relationship between psychological distress and dietary decisions for nutrient-rich (b = 0.186, p < 0.001) or nutrient-poor (b = 0.187, p < 0.001) food groups. This study provides insights for lowering psychological distress through dietary consumption, where the exact mechanisms underlying these connections have not been thoroughly elucidated. It encourages nutrition research by recommending practical nutrition education from family and environmental activities. Chronic psychological anguish may have a crucial relationship to secure access to food and a balanced diet. Along with nutrition instruction, it is critical to develop skills in interventions such as food procurement and culinary knowledge. Full article

Suicidal ideation and thoughts of self-harm continue to be challenging public health problems. It is presently unknown what the prevalence and correlates of suicidal thoughts and self-harm are in female residents of Fort McMurray, a city that has endured wildfires, flooding, and the COVID-19 pandemic in the last five years. This study aimed to determine the prevalence and correlates of suicidal ideation and thoughts of self-harm among female residents of Fort McMurray. A cross-sectional study using an online survey questionnaire was used to collect sociodemographic and clinical information from the residents of Fort McMurray between 24 April and 2 June 2021. Suicidal ideation and thoughts of self-harm among females were assessed using the ninth question of the Patient Health Questionnaire-9, a validated screening tool used to assess depression symptoms. Likely generalized anxiety disorder (GAD), major depressive disorder (MDD), post-traumatic stress disorder (PTSD) and low resilience were measured using standardized rating scales. Data were analyzed with SPSS version 25 using chi-squared tests and multivariate logistic regression analysis. Among Fort McMurray residents, 249 accessed the online survey, while 186 ultimately completed it, yielding a survey completion rate of 74.7%. Of these, 159 (85%) were females. After controlling for other variables in the regression model, respondents who expressed a desire to receive mental health counselling were more than seven times more likely to report suicidal ideation and thoughts of self-harm compared to the respondents who did not desire to receive mental health counselling (OR: 7.29; 95% CI: 1.19–44.58). Similarly, respondents who reported having abused alcohol in the past year were nearly four times more likely to report suicidal ideation or thoughts of self-harm compared to the respondents who said they had not abused alcohol in the past year (OR: 3.91; 95% CI: 1.05–14.57). A high prevalence of suicidal thoughts and thoughts of self-harm were reported among female residents of Fort McMurray. Timely access to adequate mental health support should be offered to female residents of communities impacted by multiple natural disasters, particularly residents who self-report alcohol abuse or desire to receive mental health counselling. Full article