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1.
J Neurosci ; 2024 Sep 03.
Artículo en Inglés | MEDLINE | ID: mdl-39227159

RESUMEN

Targeting altered expression and/or activity of GABA transporters (GATs) provide therapeutic benefit for age-related impairments, including cognitive dysfunction. However, the mechanisms underlying the transcriptional regulation of GATs are unknown. In the present study, we demonstrated that the stimulator of interferon genes (STING) upregulates GAT1 and GAT3 expression in the brain which resulted in cognitive dysfunction. Genetic and pharmacological intervention of STING suppressed the expression of both GAT1 and GAT3, increased the ambient GABA concentration, and therefore, enhanced tonic GABAA inhibition of principal hippocampal neurons, resulting in spatial learning and working memory deficits in mice in a type I interferon (IFN I)-independent manner. Stimulation of the STING-GAT pathway efficiently restored cognitive dysfunction in STING-deficient mice models. Our study uncovered for the first time that the STING signaling pathway regulates GATs expression in a cell autonomous manner and therefore could be a novel target for GABAergic cognitive deficits.Significance Statement GABA concentration in extracellular space is maintained by GABA release and clearance of GABA back to brain cells for degradation. GABA clearance from the synaptic cleft predominantly depends on level and activity of GABA transporters (GATs) in the brain. Insufficient GABA clearance resulted to an aberrant tonic GABAA inhibition in brain. In this study, we have identified an unusually high GABA content in brain of STING-deficient mice, resulting in cognitive impairment. Our results show that STING regulates GATs expression through STING-TBK1-IRF3 pathway and thus regulates GABAergic tone. This is the first study that indicates that the STING-TBK1-IRF3 signaling pathway maintains GABA homeostasis in brain, which may offer a novel therapeutic target for modulating GABAergic tone in cases of cognitive dysfunction.

2.
Arch Craniofac Surg ; 25(4): 161-170, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-39223767

RESUMEN

BACKGROUND: The eyes are the central aesthetic unit of the face. Maxillofacial trauma can alter facial proportions and affect visual function with varying degrees of severity. Conventional approaches to reconstruction have numerous limitations, making the process challenging. The primary objective of this study was to evaluate the application of three-dimensional (3D) navigation in complex unilateral orbital reconstruction. METHODS: A prospective cohort study was conducted over 19 months (January 2020 to July 2021), with consecutive enrollment of 12 patients who met the inclusion criteria. Each patient was followed for a minimum period of 6 months. The principal investigator carried out a comparative analysis of several factors, including fracture morphology, orbital volume, globe projection, diplopia, facial morphic changes, lid retraction, and infraorbital nerve hypoesthesia. RESULTS: Nine patients had impure orbital fractures, while the remainder had pure fractures. The median orbital volume on the normal side (30.12 cm3; interquartile range [IQR], 28.45-30.64) was comparable to that of the reconstructed orbit (29.67 cm3; IQR, 27.92-31.52). Diplopia improved significantly (T(10) = 2.667, p = 0.02), although there was no statistically significant improvement in globe projection. Gross symmetry of facial landmarks was achieved, with comparable facial width-to-height ratio and palpebral fissure lengths. Two patients reported infraorbital hypoesthesia at presentation, which persisted at the 6-month follow-up. Additionally, five patients developed lower lid retraction (1-2 mm), and one experienced implant impingement at the infraorbital border. CONCLUSION: Our study provides level II evidence supporting the use of 3D navigation to improve surgical outcomes in complex orbital reconstruction.

3.
Hosp Top ; : 1-7, 2024 Aug 21.
Artículo en Inglés | MEDLINE | ID: mdl-39166376

RESUMEN

Nurses face various emotional challenges while providing care to burn patients. An existential-phenomenological approach was utilized to gain an insight into the emotional experiences of burn nurses. The semi-structured interviews were audio recorded with twenty-two burn nurses and analyzed with Colaizzi's phenomenological method. Three themes were revealed: Emotionally overwhelming environment; Psychological trauma; Impact on quality patient care. Implementing support strategies is crucial to retain the nurses in emotionally overwhelming burn unit and to provide quality care to burn patients.

4.
Food Chem ; 460(Pt 1): 140545, 2024 Dec 01.
Artículo en Inglés | MEDLINE | ID: mdl-39047488

RESUMEN

Utilizing plant-based sources for the preservation of fresh and fresh-cut fruits and vegetables offers a natural and chemical-free method. However, the inherent instability of plant bioactive compounds underscores the necessity for encapsulation techniques. Essential oil-based nanoemulsions (EO-NEs) stand out among food additives due to their distinctive antibacterial and antioxidant properties. This review delves into recent advancements in the application of EO-NEs as edible coatings for fresh and fresh-cut produce. It examines the efficacy of EO-NEs in enhancing the preservation of fruits and vegetables by harnessing their bioactive compounds for antibacterial, antifungal, and antioxidant activities. Additionally, the review accentuates the efficacy of EO-NEs in inhibiting biofilm formation on fruits and vegetables. It reveals that coatings derived from plant-source nanoemulsions exhibit exceptional mechanical, optical, and microstructural qualities, as well as superior water barrier properties. In contrast to conventional emulsions, nanocoatings facilitate the gradual and controlled release of antimicrobial and antioxidant compounds during food storage. This feature enhances bioactivity, extends shelf life, and enhances the nutritional profile of products. By preserving and protecting shelf stability, EO-NEs contribute to the maintenance of vegetable freshness. Nonetheless, ensuring their commercial viability necessitates additional research into the toxicity of EO-based nanoemulsions.


Asunto(s)
Emulsiones , Conservación de Alimentos , Frutas , Aceites Volátiles , Verduras , Verduras/química , Frutas/química , Aceites Volátiles/química , Aceites Volátiles/farmacología , Conservación de Alimentos/métodos , Conservación de Alimentos/instrumentación , Emulsiones/química , Antioxidantes/química , Antioxidantes/farmacología , Conservantes de Alimentos/farmacología , Conservantes de Alimentos/química , Nanopartículas/química
5.
Biogerontology ; 2024 Jul 06.
Artículo en Inglés | MEDLINE | ID: mdl-38970714

RESUMEN

BRG1 (Brahma-related gene 1) is a member of the SWI/SNF (switch/sucrose nonfermentable) chromatin remodeling complex which utilizes the energy from ATP hydrolysis for its activity. In addition to its role of regulating the expression of a vast array of genes, BRG1 mediates DNA repair upon genotoxic stress and regulates senescence. During organismal ageing, there is accumulation of unrepaired/unrepairable DNA damage due to progressive breakdown of the DNA repair machinery. The present study investigates the expression level of BRG1 as a function of age in the liver of 5- and 21-month-old female mice. It also explores the impact of dietary restriction on BRG1 expression in the old (21-month) mice. Salient findings of the study are: Real-time PCR and Western blot analyses reveal that BRG1 levels are higher in 5-month-old mice but decrease significantly with age. Dietary restriction increases BRG1 expression in the 21-month-old mice, nearly restoring it to the level observed in the younger group. Similar expression patterns are observed for DNA damage response genes ATM (Ataxia Telangiectasia Mutated) and ATR (Ataxia Telangiectasia and Rad3-related) with the advancement in age and which appears to be modulated by dietary restriction. BRG1 transcriptionally regulates ATM as a function of age and dietary restriction. These results suggest that BRG1, ATM and ATR are downregulated as mice age, and dietary restriction can restore their expression. This implies that dietary restriction may play a crucial role in regulating BRG1 and related gene expression, potentially maintaining liver repair and metabolic processes as mice age.

6.
ACS Omega ; 9(21): 22831-22838, 2024 May 28.
Artículo en Inglés | MEDLINE | ID: mdl-38826559

RESUMEN

In this study, we applied density functional theory to compute the electronic, optical, and thermal properties of MP (M = Li, Na, K). We find that the materials under consideration are stable, owing to the lack of negative frequencies in the phonon spectra. LiP exhibits an indirect band gap of 1.43 eV. NaP and KP have direct band gaps of 1.67 and 1.76 eV, respectively. The family of these composites shows strong absorption, observed by their very sharp absorption edges and confirmed by their direct transition from the valence to conduction band. They exhibit strong absorption below 4.0 eV in the optical spectra, which could serve in a solar cell device. The thermal calculations show high zT values of 0.74, 0.78, and 0.64 at 300 K for LiP, NaP, and KP, respectively. Thus, our results could be promising for electronic and thermal devices.

7.
Int J Biol Macromol ; 273(Pt 2): 133090, 2024 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-38878920

RESUMEN

Biodegradable and sustainable food packaging (FP) materials have gained immense global importance to reduce plastic pollution and environmental impact. Therefore, this review focused on the recent advances in biopolymers based on cellulose derivatives for FP applications. Cellulose, an abundant and renewable biopolymer, and its various derivatives, namely cellulose acetate, cellulose sulphate, nanocellulose, carboxymethyl cellulose, and methylcellulose, are explored as promising substitutes for conventional plastic in FP. These reviews focused on the production, modification processes, and properties of cellulose derivatives and highlighted their potential for their application in FP. Finally, we reviewed the effects of incorporating cellulose derivatives into film in various aspects of packaging properties, including barrier, mechanical, thermal, preservation aspects, antimicrobial, and antioxidant properties. Overall, the findings suggest that cellulose derivatives have the potential to replace conventional plastics in food packaging applications. This can contribute to reducing plastic pollution and lessening the environmental impact of food packaging materials. The review likely provides insights into the current state of research and development in this field and underscores the significance of sustainable food packaging solutions.


Asunto(s)
Celulosa , Embalaje de Alimentos , Embalaje de Alimentos/métodos , Celulosa/química , Biopolímeros/química , Antiinfecciosos/química , Antiinfecciosos/farmacología
8.
Heliyon ; 10(9): e30109, 2024 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-38699010

RESUMEN

In the current work we studied the structural, elastics, electrical, optical, thermoelectric, as well as spectroscopic limited maximum efficiency (SLME) of oxide based Ba2AsBO6 (B[bond, double bond]Nb, Ta) materials. All the calculations were performed using first-principles calculation by employing the WIEN2k code. We checked the stability in diverse forms such as optimization, phonon dispersion, mechanical, formation energy, cohesive energy, and thermal stability is computed. The semiconducting nature of these Ba2AsBO6 (B[bond, double bond]Nb, Ta) systems is revealed by calculating the direct band gap values are 1.97 eV and 1.49 eV respectively. Additionally, we determined the optical properties which analyze the utmost absorption and transition of carriers versus photon energy (eV). Moreover, Ba2AsNbO6 has an estimated SLME of 32 %, making it an encouraging alternative for single-junction solar cells. Lastly, we studied the transport properties against temperature, the chemical potential for p-type and n-type charge carriers at various temperatures. At 300 K, the zT values are found to be 0.757 and 0.751 for Ba2AsBO6 (B[bond, double bond]Nb, Ta) compounds respectively. Both materials were examined as having strong absorption patterns and an excellent figure of merit (ZT), indicating that materials are appropriate for daily life applications.

9.
Food Chem ; 454: 139817, 2024 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-38805929

RESUMEN

Precise and reliable analytical techniques are required to guarantee food quality in light of the expanding concerns regarding food safety and quality. Because traditional procedures are expensive and time-consuming, quick food control techniques are required to ensure product quality. Various analytical techniques are used to identify and detect food fraud, including spectroscopy, chromatography, DNA barcoding, and inotrope ratio mass spectrometry (IRMS). Due to its quick findings, simplicity of use, high throughput, affordability, and non-destructive evaluations of numerous food matrices, NI spectroscopy and hyperspectral imaging are financially preferred in the food business. The applicability of this technology has increased with the development of chemometric techniques and near-infrared spectroscopy-based instruments. The current research also discusses the use of several multivariate analytical techniques in identifying food fraud, such as principal component analysis, partial least squares, cluster analysis, multivariate curve resolutions, and artificial intelligence.


Asunto(s)
Contaminación de Alimentos , Contaminación de Alimentos/análisis , Fraude/prevención & control , Análisis de los Alimentos/métodos , Inocuidad de los Alimentos , Espectrometría de Masas
10.
Food Chem ; 447: 138945, 2024 Jul 30.
Artículo en Inglés | MEDLINE | ID: mdl-38461725

RESUMEN

Artificial intelligence has the potential to alter the agricultural and food processing industries, with significant ramifications for sustainability and global food security. The integration of artificial intelligence in agriculture has witnessed a significant uptick in recent years. Therefore, comprehensive understanding of these techniques is needed to broaden its application in agri-food supply chain. In this review, we explored cutting-edge artificial intelligence methodologies with a focus on machine learning, neural networks, and deep learning. The application of artificial intelligence in agri-food industry and their quality assurance throughout the production process is thoroughly discussed with an emphasis on the current scientific knowledge and future perspective. Artificial intelligence has played a significant role in transforming agri-food systems by enhancing efficiency, sustainability, and productivity. Many food industries are implementing the artificial intelligence in modelling, prediction, control tool, sensory evaluation, quality control, and tackling complicated challenges in food processing. Similarly, artificial intelligence applied in agriculture to improve the entire farming process, such as crop yield optimization, use of herbicides, weeds identification, and harvesting of fruits. In summary, the integration of artificial intelligence in agri-food systems offers the potential to address key challenges in agriculture, enhance sustainability, and contribute to global food security.


Asunto(s)
Inteligencia Artificial , Industria de Procesamiento de Alimentos , Industria de Alimentos , Manipulación de Alimentos , Redes Neurales de la Computación , Agricultura
11.
RSC Adv ; 14(10): 6762-6775, 2024 Feb 21.
Artículo en Inglés | MEDLINE | ID: mdl-38405071

RESUMEN

In this study, we employed density functional theory coupled with the full-potential linearized augmented plane-wave method (FP-LAPW) to investigate the structural, electronic, and magnetic properties of the Ti2FeAs alloy adopting the Hg2CuTi-type structure. Our findings demonstrate that all the examined structures exhibit ferromagnetic (FM) behaviour. By conducting electronic band structure calculations, we observed an energy gap of 0.739 eV for Ti2FeAs in the spin-down state and metallic intersections at the Fermi level in the spin-up state. These results suggest the half-metallic (HM) nature of Ti2FeAs, where the Ti-d and Fe-d electronic states play a significant role near the Fermi level. Additionally, the obtained total magnetic moments are consistent with the Slater-Pauling rule (Mtot = Ztot - 18), indicating 100% spin polarization for these compounds. To explore their optical properties, we employed the dielectric function to compute various optical parameters, including absorption spectra, energy-loss spectra, refractive index, reflectivity, and conductivity. Furthermore, various thermodynamic parameters were evaluated at different temperatures and pressures. The results obtained from the elastic parameters reveal the anisotropic and ductile nature of the Ti2FeAs compound. These findings suggest that Ti2FeAs has potential applications in temperature-tolerant devices and optoelectronic devices as a UV absorber.

12.
Int J Biol Macromol ; 259(Pt 1): 129129, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38181913

RESUMEN

Agro-food waste is a rich source of biopolymers such as cellulose, chitin, and starch, which have been shown to possess excellent biocompatibility, biodegradability, and low toxicity. These properties make biopolymers from agro-food waste for its application in tissue engineering and regenerative medicine. Thus, this review highlighted the properties, processing methods, and applications of biopolymers derived from various agro-food waste sources. We also highlight recent advances in the development of biopolymers from agro-food waste and their potential for future tissue engineering and regenerative medicine applications, including drug delivery, wound healing, tissue engineering, biodegradable packaging, excipients, dental applications, diagnostic tools, and medical implants. Additionally, it explores the challenges, prospects, and future directions in this rapidly evolving field. The review showed the evolution of production techniques for transforming agro-food waste into valuable biopolymers. However, these biopolymers serving as the cornerstone in scaffold development and drug delivery systems. With their role in wound dressings, cell encapsulation, and regenerative therapies, biopolymers promote efficient wound healing, cell transplantation, and diverse regenerative treatments. Biopolymers support various regenerative treatments, including cartilage and bone regeneration, nerve repair, and organ transplantation. Overall, this review concluded the potential of biopolymers from agro-food waste as a sustainable and cost-effective solution in tissue engineering and regenerative medicine, offering innovative solutions for medical treatments and promoting the advancement of these fields.


Asunto(s)
Eliminación de Residuos , Ingeniería de Tejidos , Medicina Regenerativa/métodos , Alimento Perdido y Desperdiciado , Alimentos , Polímeros , Biopolímeros
13.
eNeuro ; 11(2)2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38176904

RESUMEN

NMDA receptors (NMDARs) modulate glutamatergic excitatory tone in the brain via two complementary modalities: a phasic excitatory postsynaptic current and a tonic extrasynaptic modality. Here, we demonstrated that the tonic NMDAR-current (I NMDA) mediated by NR2A-containing NMDARs is an efficient biosensor detecting the altered ambient glutamate level in the supraoptic nucleus (SON). I NMDA of magnocellular neurosecretory cells (MNCs) measured by nonselective NMDARs antagonist, AP5, at holding potential (V holding) -70 mV in low concentration of ECF Mg2+ ([Mg2+]o) was transiently but significantly increased 1-week post induction of a DOCA salt hypertensive model rat which was compatible with that induced by a NR2A-selective antagonist, PEAQX (I PEAQX) in both DOCA-H2O and DOCA-salt groups. In agreement, NR2B antagonist, ifenprodil, or NR2C/D antagonist, PPDA, did not affect the holding current (I holding) at V holding -70 mV. Increased ambient glutamate by exogenous glutamate (10 mM) or excitatory amino acid transporters (EAATs) antagonist (TBOA, 50 mM) abolished the I PEAQX difference between two groups, suggesting that attenuated EAATs activity increased ambient glutamate concentration, leading to the larger I PEAQX in DOCA-salt rats. In contrast, only ifenprodil but not PEAQX and PPDA uncovered I NMDA at V holding +40 mV under 1.2 mM [Mg2+]o condition. I ifenprodil was not different in DOCA-H2O and DOCA-salt groups. Finally, NR2A, NR2B, and NR2D protein expression were not different in the SON of the two groups. Taken together, NR2A-containing NMDARs efficiently detected the increased ambient glutamate concentration in the SON of DOCA-salt hypertensive rats due to attenuated EAATs activity.


Asunto(s)
Acetato de Desoxicorticosterona , Receptores de N-Metil-D-Aspartato , Ratas , Animales , Receptores de N-Metil-D-Aspartato/metabolismo , N-Metilaspartato/metabolismo , N-Metilaspartato/farmacología , Ácido Glutámico/metabolismo , Núcleo Supraóptico/metabolismo , Antagonistas de Aminoácidos Excitadores/farmacología
14.
Vet Anim Sci ; 23: 100331, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38283334

RESUMEN

This study attempts to isolate a candidate growth promoter from the ovine paunch waste and scrutinize its effects on the production performance of broiler chickens as compared to mannan-oligosaccharide (MOS), a prebiotic, and lincomycin, an antibiotic growth promoter (AB). The paunch waste collected from slaughtered sheep was processed to remove particulate matter. The clarified liquid was then added to an excess of ethanol (1:9 ratio), and the resultant precipitate {(novel growth-promoting paunch extract (NGPE)} was collected, dried, and stored. In vitro increase in cell density for probiotic bacteria viz. Lactobacillus rhamnosus and Enterococcus faecalis (Log10 CFU/ml) were significantly higher (P < 0.01) in NGPE supplemented media (2.78 ± 0.11 and 2.77 ± 0.10) as compared to that on MOS (1.28 ± 0.05 and 2.49 ± 0.09) and glucose (1.09 ± 0.04 and 1.12 ± 0.04) supplemented media. In the in-vivo trial of six weeks duration with broiler chickens (Cobb-400), NGPE supplementation resulted in significantly higher growth in weeks IV (P < 0.05) and VI (P < 0.01) of age in comparison to MOS and AGP supplemented groups, a lower (P < 0.01) cumulative feed conversion ratio in comparison to MOS supplemented groups, and a higher (P < 0.01) cumulative protein efficiency ratio compared to MOS and AGP supplementation. NGPE supplementation also lowered lipid peroxidation (P < 0.01), increased reduced glutathione activity (P < 0.01) in chicken erythrocytes, and boosted the lactic acid bacteria count in the cecal contents (P < 0.01). This is the first report of the isolation of a paunch waste extract that increased the in vitro growth of probiotic bacteria and improved the production performance of broiler chickens.

15.
RSC Adv ; 14(6): 4165-4178, 2024 Jan 23.
Artículo en Inglés | MEDLINE | ID: mdl-38292271

RESUMEN

In this study, the density functional theory (DFT) was employed to study the structural, electronic, optical, and thermoelectric characteristics of half-Heusler (HH) FeTaX (X = P or As). Optimization of the structures was achieved using Perdew-Burke-Ernzerhof (PBE) parametrized generalized gradient approximation (GGA). These HH FeTaX (X = P, As) showed indirect bandgaps of 0.882 eV and 0.748 eV, respectively. The predicted density of states (DOS) spectra suggest that Fe-d and Ta-d states contribute predominantly to both valence and conduction bands, whereas P/As-p states contribute less. Optical properties were investigated to assess their potential in optoelectronic applications. The estimated values of various optical parameters and low loss suggest that the studied HH FeTaX (X = P, As) are suitable for optoelectronic device applications. The thermoelectric responses of the studied HH FeTaX (X = P, As) were computed, and their highest power factors at high temperature reflects their usage in thermoelectric devices.

16.
Int J Biol Macromol ; 256(Pt 2): 128517, 2024 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-38040157

RESUMEN

Water pollution presents a significant challenge, impacting ecosystems and human health. The necessity for solutions to address water pollution arises from the critical need to preserve and protect the quality of water resources. Effective solutions are crucial to safeguarding ecosystems, human health, and ensuring sustainable access to clean water for current and future generations. Generally, cellulose and its derivatives are considered potential substrates for wastewater treatment. The various cellulose processing methods including acid, alkali, organic & inorganic components treatment, chemical treatment and spinning methods are highlighted. Additionally, we reviewed effective use of the cellulose derivatives (CD), including cellulose nanocrystals (CNCs), cellulose nano-fibrils (CNFs), CNPs, and bacterial nano-cellulose (BNC) on waste water (WW) treatment. The various cellulose processing methods, including spinning, mechanical, chemical, and biological approaches are also highlighted. Additionally, cellulose-based materials, including adsorbents, membranes and hydrogels are critically discussed. The review also highlighted the mechanism of adsorption, kinetics, thermodynamics, and sorption isotherm studies of adsorbents. The review concluded that the cellulose-derived materials are effective substrates for removing heavy metals, dyes, pathogenic microorganisms, and other pollutants from WW. Similarly, cellulose based materials are used for flocculants and water filtration membranes. Cellulose composites are widely used in the separation of oil and water emulsions as well as in removing dyes from wastewater. Cellulose's natural hydrophilicity makes it easier for it to interact with water molecules, making it appropriate for use in water treatment processes. Furthermore, the materials derived from cellulose have wider application in WW treatment due to their inexhaustible sources, low energy consumption, cost-effectiveness, sustainability, and renewable nature.


Asunto(s)
Contaminantes Químicos del Agua , Purificación del Agua , Humanos , Celulosa/química , Aguas Residuales , Ecosistema , Colorantes , Adsorción , Purificación del Agua/métodos
17.
Cleft Palate Craniofac J ; 61(1): 126-130, 2024 01.
Artículo en Inglés | MEDLINE | ID: mdl-35979590

RESUMEN

Palatal fistulae are challenging complications following cleft palate repair. The addition of acellular dermal matrix (ADM) to cleft palate repair has been shown to reduce fistula formation in previous studies. The use of autologous dermal graft has all the structural advantages of ADM, has less rejection and immunogenic potential, and is cost effective.A prospective study.Patients with Group II and III cleft palate (Nagpur Classification) without prior intervention for palatal repair in the Department of Plastic Surgery at PGIMER from January 2020 till June 2021.The addition of autologous dermal graft for palatoplasty.Outcome of the study was fistula development or exposure of dermal graft.Autologous dermal graft was harvested of average dimension of 8.73 cm2 (range 5.25-18 cm2) from groin region. Sixteen patients were included in the study. Among them, 2 patients (12.5%) developed postoperative fistula (Type III &V Pittsburgh Classification).Our study showed that the rates of postoperative fistula formation are comparable with prior literature using artificial dermal matrices.


Asunto(s)
Dermis Acelular , Fisura del Paladar , Fístula , Procedimientos de Cirugía Plástica , Humanos , Lactante , Fisura del Paladar/cirugía , Fisura del Paladar/complicaciones , Estudios Prospectivos , Fístula/cirugía , Complicaciones Posoperatorias/etiología , Fístula Oral/cirugía , Estudios Retrospectivos , Resultado del Tratamiento
18.
RSC Adv ; 13(51): 35799-35809, 2023 Dec 08.
Artículo en Inglés | MEDLINE | ID: mdl-38074405

RESUMEN

Extensive investigations have been conducted on the thermoelectric and optoelectronic characteristics of double perovskite compounds using the full potential linearized augmented plane wave (FP-LAPW) approach. Here we investigated Rb2NaGaZ6 (Z = Br, I) to explore its band structure, and electronic, optical and transport properties. Born's stability criteria have confirmed the mechanical stability of these compounds. Analysis of the elastic properties reveals their ductile nature, as indicated by a Poisson coefficient (υ) greater than 0.26 and a Pugh ratio exceeding 1.75 for Rb2NaGaZ6 (Z = Br, I). Computation of the bandgap values shows that both compositions possess a direct bandgap nature, with respective values of 2.90 eV and 1.25 eV. This suggests that substituting Br with I brings the band edges closer together, resulting in a decrease in the bandgap value. The optical properties are assessed based on the absorption coefficient, reflectivity, and dielectric constants. The thermoelectric properties, including thermal and electrical conductivities, power factor (PF), and figure of merit (ZT), are determined using the BoltzTrap code. The ZT values indicate that both compositions exhibit promising potential for various transportation applications.

19.
RSC Adv ; 13(50): 35145-35160, 2023 Nov 30.
Artículo en Inglés | MEDLINE | ID: mdl-38053680

RESUMEN

This work presents the investigation of physical characteristics including structural, electronic, elastic, optical and thermoelectric, of the double perovskite (DP) oxide Sr2ScBiO6 with the aid of the FP-LAPW method, dependent on DFT combined with BoltzTraP code. To incorporate the inclusion of exchange as well as correlation effects, approximations like LDA and three different forms of GGA [PBE-GGA, WC-GGA & PBEsol-GGA] are applied. The mBJ-GGA method including spin-orbital coupling (SOC) & not including SOC was utilised in this investigation and it was carried out in the WIEN2k code. In addition, the TB-mBJ exchange potential analysis classified Sr2ScBiO6 as having a p-type semiconducting nature with an indirect bandgap value of 3.327 eV. Additionally, the mechanical properties analysis and the related elastic constants demonstrate the anisotropic nature of Sr2ScBiO6 with decent mechanical stability. Apart from that, the Sr2ScBiO6 was considered a brittle non-central force solid with dominant covalent bonding. The varying optical parameter evaluations highlighted the potential use of Sr2ScBiO6 in visible-light (vis) and ultraviolet (UV)-based optoelectronic devices. Moreover, the semiconducting nature of Sr2ScBiO6 was verified through its thermoelectric response, which revealed that the charge carriers mostly consist of holes. Over a wide temperature range (100-1200 K), several transport metrics like the Seebeck coefficient (S), electrical conductivity (σ/τ), thermal conductivity (κ/τ), and power factor (PF) are investigated. An optimal value of figure of merit (ZT) ∼ 0.62 at T = 1200 K is accomplished. The extremely lower value of thermal conductivity as well as higher electrical conductivity leads to a higher figure of merit of the investigated system. The Sr2ScBiO6 verified a high ZT value, confirming that the material would be beneficial in renewable energy and thermoelectric (TE) applications.

20.
ACS Omega ; 8(43): 40341-40350, 2023 Oct 31.
Artículo en Inglés | MEDLINE | ID: mdl-37929160

RESUMEN

The current study used full-potential methods to examine the ferromagnetic characteristics of CdTm2Y4(Y= S, Se) spinels; i.e., structural, elastic, electronic, and thermoelectric characteristics of these spinels have been explored for the first time. We used PBEsol-GGA for enthalpy of formation calculations to explain the stability of the ferromagnetic state and calculate the elastic constants and corresponding mechanical modules to reveal the ductile behavior of the materials. The mBJ potential is used instead of PBEsol-GGA to obtain more accurate and precise results of electronic and thermoelectric characteristics. Using mBJ potential leads to complete occupation of the bands in the materials and a clear interpretation of the density of states (DOS). The analysis of the electronic band structure and DOS reveals the stability of the ferromagnetic state in the analyzed materials as a result of p-d hybridization-based exchange splitting of Tm cations in the lattice. The calculations of thermoelectric efficiency are effective in evaluating the aptitude pertinence of the material in waste energy recovery systems and other technological applications. The thermal parameters of these materials are also analyzed to examine their thermal stability over a wide range of temperatures. The results of these calculations are essential for determining the suitability of the materials for use in spintronics-based devices and thermoelectric appliances as these devices rely heavily on the material's thermoelectric properties.

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