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1.
Sci Rep ; 14(1): 19855, 2024 08 27.
Artículo en Inglés | MEDLINE | ID: mdl-39191880

RESUMEN

Soft denture liners have limitations like short lifespan and increased microbial buildup. Despite promise as a non-leaching antimicrobial polymer in dentistry, the impact of dimethylaminododecyl methacrylate (DMADDM) on soft liner performance remains unexplored. This study aimed to evaluate the effect of integrating different concentrations of DMADDM to cold cure acrylic resin soft liner, on its antimicrobial activity, cytotoxicity, and physical properties. The same properties were compared to a conventional commercially available denture soft liner. The study employed a control group (conventional soft liner) and three test groups containing 3.3%, 6.6%, and 10% (total mass fraction) DMADDM, respectively. Antimicrobial activity against Candida albicans and Streptococcus mutans was assessed through colony counts and biofilm biomass. Cytotoxicity was evaluated using an oral epithelial cell line. Additionally, wettability and hardness were measured to assess physical properties. Incorporation of DMADDM significantly reduced Candida albicans and Streptococcus mutans counts, and biofilm biomass, compared to the control. Additionally, DMADDM improved the soft liner's wettability and mitigated long-term hardness increase. In conclusion, DMADDM holds promise in enhancing soft liner performance. However, careful selection of its optimum concentration is crucial to ensure both safety and efficacy for future clinical use.


Asunto(s)
Biopelículas , Candida albicans , Metacrilatos , Streptococcus mutans , Candida albicans/efectos de los fármacos , Streptococcus mutans/efectos de los fármacos , Metacrilatos/química , Metacrilatos/farmacología , Biopelículas/efectos de los fármacos , Biopelículas/crecimiento & desarrollo , Humanos , Alineadores Dentales , Resinas Acrílicas/química , Ensayo de Materiales , Antiinfecciosos/farmacología , Antiinfecciosos/química , Materiales Dentales/farmacología , Materiales Dentales/química , Línea Celular , Compuestos de Amonio Cuaternario
2.
Biomed Mater ; 19(5)2024 Jul 15.
Artículo en Inglés | MEDLINE | ID: mdl-38917826

RESUMEN

This study was designed to deposit nanodiamonds (NDs) on 3D-printed poly-ϵ-caprolactone (PCL) scaffolds and evaluate their effect on the surface topography, hydrophilicity, degradation, andin-vitrocell adhesion compared to untreated PCL scaffolds. The PCL scaffold specimens were 3D-printed by fused deposition modeling (FDM) technique with specific porosity parameters. The 3D-printed specimens' surfaces were modified by NDs deposition followed by oxygen plasma post-treatment using a plasma focus device and a non-thermal atmospheric plasma jet, respectively. Specimens were evaluated through morphological characterization by field emission scanning electron microscope (FESEM), microstructure characterization by Raman spectroscopy, chemical characterization by Fourier transform infrared (FTIR) spectroscopy, hydrophilicity degree by contact angle and water uptake measurements, andin-vitrodegradation measurements (n= 6). In addition,in-vitrobone marrow mesenchymal stem cells adhesion was evaluated quantitatively by confocal microscopy and qualitatively by FESEM at different time intervals after cell seeding (n= 6). The statistical significance level was set atp⩽ 0.05. The FESEM micrographs, the Raman, and FTIR spectra confirmed the successful surface deposition of NDs on scaffold specimens. The NDs treated specimens showed nano-scale features distributed homogeneously across the surface compared to the untreated ones. Also, the NDs treated specimens revealed a statistically significant smaller contact angle (17.45 ± 1.34 degrees), higher water uptake percentage after 24 h immersion in phosphate buffer saline (PBS) (21.56% ± 1.73), and higher degradation rate after six months of immersion in PBS (43.92 ± 0.77%). Moreover, enhanced cell adhesion at all different time intervals was observed in NDs treated specimens with higher nuclei area fraction percentage (69.87 ± 3.97%) compared to the untreated specimens (11.46 ± 1.34%). Surface deposition of NDs with oxygen-containing functional groups on 3D-printed PCL scaffolds increased their hydrophilicity and degradation rate with significant enhancement of thein-vitrocell adhesion compared to untreated PCL scaffolds.


Asunto(s)
Adhesión Celular , Interacciones Hidrofóbicas e Hidrofílicas , Células Madre Mesenquimatosas , Nanodiamantes , Poliésteres , Impresión Tridimensional , Propiedades de Superficie , Ingeniería de Tejidos , Andamios del Tejido , Andamios del Tejido/química , Ingeniería de Tejidos/métodos , Poliésteres/química , Células Madre Mesenquimatosas/citología , Nanodiamantes/química , Porosidad , Animales , Huesos , Espectroscopía Infrarroja por Transformada de Fourier , Ensayo de Materiales , Microscopía Electrónica de Rastreo , Espectrometría Raman , Humanos
3.
Chemosphere ; 358: 142130, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38685320

RESUMEN

Phosphorus (P) and Ammonium Nitrogen (N) are essential nutrients for plants and environmental stability. However, their excess in water causes eutrophication, damaging aquatic ecosystems. While adsorption is a promising solution, finding affordable and efficient adsorbents remains a challenge. In this study, magnesium (Mg), iron (Fe), and Mg/Fe doped biochars (BC) adsorbents were synthesized, and evaluated for adsorption of individual P and N and a P + N mixture from a solution and wastewater from a wastewater treatment plant. Compared to other adsorbents, Mg/BC showed excellent performance in adsorbing phosphorus (P) and ammonium nitrogen (N) from aqueous solutions. It demonstrated a large adsorption capacity of 64.65 mg/g and 62.50 mg/g from individual P and N solutions, and 30.3 mg/g and 27.67 mg/g from the P and N mixture solution, respectively. In addition, Mg/BC efficiently removed P and N from real-life wastewater. In the real wastewater, P and N removal efficiencies reached 88.30% and 59.36%, respectively. Kinetics analysis revealed that the pseudo-second-order model accurately described the adsorption of phosphorus (P) and ammonium nitrogen (N) in all solutions. The adsorbent followed the monolayer-Langmuir isotherm for N ions and the multilayer-Freundlich isotherm for P, indicating efficient adsorption processes. Thermodynamic experiments indicated that the adsorption of P and N was not only feasible but also occurred spontaneously in a natural manner. This study revealed that the strategic modification of biochar plays a crucial role in advancing effective wastewater treatment technologies designed for nutrient removal.


Asunto(s)
Carbón Orgánico , Magnesio , Nitrógeno , Fosfatos , Aguas Residuales , Contaminantes Químicos del Agua , Carbón Orgánico/química , Adsorción , Nitrógeno/química , Magnesio/química , Contaminantes Químicos del Agua/química , Fosfatos/química , Aguas Residuales/química , Cinética , Eliminación de Residuos Líquidos/métodos , Fósforo/química , Purificación del Agua/métodos
4.
Sci Rep ; 13(1): 19243, 2023 11 07.
Artículo en Inglés | MEDLINE | ID: mdl-37935743

RESUMEN

To evaluate the biomimetic remineralization capabilities of Moringa oleifera leaves (MOL) extract on coronal dentin and acellular cementum, two different concentrations (50 and 200 mg/ml) of MOL extract loaded in plain varnish (M1 and M2 groups respectively) were compared to fluoride varnish (FL group) and native surface (C group). Eighty sound premolar teeth were collected. Forty teeth (10 teeth in each group) were used for coronal dentin testing while the other forty (10 teeth in each group) were used for acellular cementum testing. Teeth in M1, M2, and FL groups were etched for 30 s and then received the specific varnish treatment. All samples were immersed in artificial saliva for 14 days and then collected, dried, and examined by scanning electron microscopy and energy dispersive X-ray spectroscopy (EDX). Histologically, FL group showed mineral deposition as discrete vesicular granules of various sizes on the surface of both coronal dentin and acellular cementum. Mineral deposition only occurred on some DTs openings while opened tubules remained. The surface of the acellular cementum revealed regular grooves, micro-fissures, and cracks. In the M1 and M2 groups, mineral deposition appeared as a homogenous continuous layer on coronal dentin and acellular cementum. Only a few DTs and cementum fissures were not filled completely. In L.S. sections of the coronal one-third, the DTs appeared almost sealed with varying lengths of mineral deposition. EDX results statistical analysis showed that the M2 group had the highest phosphate ions (P-) and calcium ions (Ca+2) at%. MOL has an extraordinary effect on the remineralization of coronal dentin and acellular cementum. It would have a promising ability to control dentinal hypersensitivity and formation of biomimetic cementum tissue.


Asunto(s)
Dentina , Moringa oleifera , Dentina/química , Microscopía Electrónica de Rastreo , Diente Premolar , Fluoruros/análisis , Minerales/análisis
5.
Open Vet J ; 13(10): 1268-1276, 2023 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-38027401

RESUMEN

Background: Pomegranate granatum (molasses and peels) and its constituents showed protective effects against natural toxins such as phenylhydrazine (PHZ) as well as chemical toxicants such as arsenic, diazinon, and carbon tetrachloride. Aim: The current study aimed to assess the effect of pomegranate molasses (PM), white peel extract, and red peel extract on nephrotoxicity induced by PHZ. Methods: 80 male rats were divided into eight equal groups; a control group, PM pure group, white peel pomegranate pure group, red peel pomegranate pure group, PHZ group, PM + PHZ group, white peel pomegranate + PHZ group and red peel pomegranate + PHZ group. Kidney function, inflammation markers, antioxidant activities, and renal tissue histopathology were investigated. Results: The results revealed that PHZ group showed a significant increase in lactate Dehydrogenase (LDH), malondialdehyde (MDA), creatinine, uric acid, BUNBUN, C - reactive protein (CRP), tumor necrosis factor, thiobarbituric acid reactive substances (TBARSs), and total antioxidant capacity (TAC) with a significant decrease of catalase (CAT), glutathione peroxidase (GPx), and superoxide dismutase (SOD) as compared with a control group. Other pomegranate-treated and PHZ co-treated groups with pomegranate showed a significant decrease of LDH, MDA, creatinine, uric acid, BUN, tumor necrosis factor, TBARSs, and TAC with a significant increase of CAT, GPx, and SOD as compared with PHZ group. Conclusion: Collectively, our data suggest that red, white peels, and molasses have anti-toxic and anti-inflammatory effects on renal function and tissues.


Asunto(s)
Antioxidantes , Granada (Fruta) , Ratas , Masculino , Animales , Antioxidantes/farmacología , Antioxidantes/análisis , Antioxidantes/metabolismo , Granada (Fruta)/metabolismo , Frutas/química , Frutas/metabolismo , Ácido Úrico/análisis , Ácido Úrico/metabolismo , Creatinina/análisis , Creatinina/metabolismo , Extractos Vegetales/farmacología , Riñón/metabolismo , Superóxido Dismutasa/análisis , Superóxido Dismutasa/metabolismo , Factores de Necrosis Tumoral/análisis , Factores de Necrosis Tumoral/metabolismo , Fenilhidrazinas/análisis , Fenilhidrazinas/metabolismo
6.
Acute Crit Care ; 38(2): 217-225, 2023 May.
Artículo en Inglés | MEDLINE | ID: mdl-37313668

RESUMEN

BACKGROUND: Polytrauma from road accidents is a common cause of hospital admissions and deaths, frequently leading to acute kidney injury (AKI) and impacting patient outcomes. METHODS: This retrospective, single-center study included polytrauma victims with an Injury Severity Score (ISS) >25 at a tertiary healthcare center in Dubai. RESULTS: The incidence of AKI in polytrauma victims is 30.5%, associated with higher Carlson comorbidity index (P=0.021) and ISS (P=0.001). Logistic regression shows a significant relationship between ISS and AKI (odds ratio [OR], 1.191; 95% confidence interval [CI], 1.150-1.233; P<0.05). The main causes of trauma-induced AKI are hemorrhagic shock (P=0.001), need for massive transfusion (P<0.001), rhabdomyolysis (P=0.001), and abdominal compartment syndrome (ACS; P<0.001). On multivariate logistic regression AKI can be predicated by higher ISS (OR, 1.08; 95% CI, 1.00-1.17; P=0.05) and low mixed venous oxygen saturation (OR, 1.13; 95% CI, 1.05-1.22; P<0.001). The development of AKI after polytrauma increases length of stay (LOS)-hospital (P=0.006), LOS-intensive care unit (ICU; P=0.003), need for mechanical ventilation (MV) (P<0.001), ventilator days (P=0.001), and mortality (P<0.001). CONCLUSIONS: After polytrauma, the occurrence of AKI leads to prolonged hospital and ICU stays, increased need for mechanical ventilation, more ventilator days, and a higher mortality rate. AKI could significantly impact their prognosis.

7.
Sci Total Environ ; 872: 162156, 2023 May 10.
Artículo en Inglés | MEDLINE | ID: mdl-36773922

RESUMEN

Mountain glaciers are at risk of rapid retreat and require an accurate prediction of their melt and evolution. However, there is a great deal of hassle with mountain glacier melt modelling at a regional scale. Most advanced physical process-based models require an ample amount of high-resolution measurements, while widely-used empirical models suffer from parameter transferability. We developed a glacier melt, mass balance, and evolution modelling framework using three temperature index melt modelling approaches. We performed 24 model scenarios to examine the response of 19 empirical parameters to the effects of: (1) two time periods, for understanding how parameter response can vary with time period considered for the simulation; (2) two glaciers located at the eastern slopes of the Canadian Rocky Mountains, for understanding the effects of glaciers hydro-climate and geographic setting; and (3) two levels of complexity in the model structure including melt and mass balance models coupled with (complex) and without (simple) glacier evolution modules. The results showed that the best optimal melt parameter sets vary temporally and spatially for both simple and complex models, indicating that they are not transferable from one period to another and across glaciers. The variations of ice melt parameters are greater than the snowmelt parameters. The spatiotemporal variations of parameters are resulted from the geographical and local climatic settings and energy balance components, including albedo parameterization on the glacier surface, the altitudinal variations of the glaciers, and the slope and aspects to which glaciers are exposed. For all models, the most sensitive parameter is temperature Lapse rate (LR), but with increasing model complexity, the parameter responses vary depending on the melt model structure and input data. Our study provides important information for modelling glacier melt and evolution at a regional scale.

8.
Chemosphere ; 313: 137424, 2023 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-36495985

RESUMEN

The efficacy of novel polycarbonate ultrafiltration, aluminum oxide nanoparticle (Al2O3-NPs) volume fraction, temperature, and water/ethylene glycol (EG) ratio were evaluated to determine the thermophysical properties of the membrane. 5%-10% of Al2O3-NPs have been added to the PC. A machine learning approach was used to compare the volume fraction of Al2O3-NPs, the temperature, and the water-to-ethylene glycol (EG) ratio. To determine the impact of Al2O3-NPs loading on the Response Surface Method (RSM), DOE, ANOVA, ANN, MLP, and NSGA-II, the number of aluminum oxide nanoparticles (Al2O3-NPs), temperature, and water/ethylene glycol (EG) on membranes in PC ultrafiltration are evaluated. Based on the Relative Thermal Conductivity Model (RSM), the regression coefficient of Al2O3 in water and EG was 0.9244 and 0.9170 with adjusted regression coefficients. A higher concentration of EG enhances the thermal conductivity of the membrane when the effective parameters are considered. The effect of temperature on the relative viscosity of the membrane led to the conclusion that Al2O3 water/EG can cool at high temperatures while providing no viscosity change. When Al2O3 is dissolved in water and EG, more EG is necessary to optimize the mode of reactivity. Using the MLP model, the calculated R-value is 0.9468, the MSE is 0.001752989 (mean square error), and the MAE is 0.01768558 (mean absolute error). RSM predicted the average thermal conductivity behavior of nanofluid better. The ANN model, however, has proven to be more effective than the RSM in simulating the relative viscosity of nanofluids. The NSGA-II optimized results showed that the minimum relative viscosity and maximum coefficient of thermal conductivity occurred at the lowest water ratio and maximum temperature.


Asunto(s)
Nanopartículas , Agua , Temperatura , Ultrafiltración , Óxido de Aluminio , Glicoles de Etileno
9.
Sensors (Basel) ; 22(21)2022 Nov 06.
Artículo en Inglés | MEDLINE | ID: mdl-36366247

RESUMEN

This study focuses on the role of the damage evolution when estimating the failure behavior of AISI 1045 steel for sensing and measuring metal cutting parameters. A total of five Lagrangian explicit models are established to investigate the effect of applying damage evolution techniques. The Johnson-Cook failure model is introduced once to fully represent damage behavior, i.e., no damage evolution is considered, and as a damage initiation criterion in the remaining approaches. A fracture energy-based model is included to model damage propagation with different evolution rates. Temperature-dependent and temperature-independent fracture energy models are also investigated. Dry orthogonal cutting and residual stresses measurements of AISI 1045 are conducted for validation. The significance of the damage evolution is investigated using honed-tool and sharp-tool models. Including the damage evolution led to a prediction of higher workpiece temperatures, plastic strains, cutting forces, and residual stresses, with no clear differences between linear and exponential evolution rates. The role of damage evolution is more evident when temperature-dependent evolution models are used.

10.
J Vasc Interv Radiol ; 33(1): 14-18, 2022 01.
Artículo en Inglés | MEDLINE | ID: mdl-34980450

RESUMEN

The purpose of this retrospective review was to evaluate SpineJack implantation in cancer-related vertebral compression fractures in 13 consecutive patients (mean age, 62.8 years ± 18.8). A total of 36 devices were inserted at 20 levels (13 [65%] lumbar and 7 [35%] thoracic vertebrae), with a mean Spinal Instability Neoplastic Score of 9.1 ± 2.1. Vertebral height restoration was observed in 10 levels (50%), with a mean height restoration of 5.6 mm ± 2.2 (interquartile range [IQR], 4-7.5). A total of 6 cement leakages were observed in 3 (23%) patients without clinical consequences. No severe adverse events were observed. One adjacent fracture occurred. Average pain scores on the visual analog scale significantly improved from 5.5 ± 1.8 (IQR, 4-7) preoperatively to 1.5 ± 2.2 (IQR, 0-3.3) at 1 month (P < .01) and to 1.5 ± 1.3 (IQR, 0.3-2.8) at 6 months (P < .01). In this small cohort, SpineJack offered pain relief in cancer-related fractures without an observed increase in adverse events.


Asunto(s)
Fracturas por Compresión , Cifoplastia , Neoplasias , Fracturas Osteoporóticas , Fracturas de la Columna Vertebral , Cementos para Huesos/efectos adversos , Fracturas por Compresión/diagnóstico por imagen , Fracturas por Compresión/etiología , Fracturas por Compresión/cirugía , Humanos , Vértebras Lumbares/diagnóstico por imagen , Vértebras Lumbares/lesiones , Persona de Mediana Edad , Estudios Retrospectivos , Fracturas de la Columna Vertebral/diagnóstico por imagen , Fracturas de la Columna Vertebral/etiología , Fracturas de la Columna Vertebral/cirugía , Vértebras Torácicas/diagnóstico por imagen , Resultado del Tratamiento
11.
Transl Neurodegener ; 11(1): 2, 2022 01 06.
Artículo en Inglés | MEDLINE | ID: mdl-34986876

RESUMEN

BACKGROUND: The metabolic syndrome is a consequence of modern lifestyle that causes synaptic insulin resistance and cognitive deficits and that in interaction with a high amyloid load is an important risk factor for Alzheimer's disease. It has been proposed that neuroinflammation might be an intervening variable, but the underlying mechanisms are currently unknown. METHODS: We utilized primary neurons to induce synaptic insulin resistance as well as a mouse model of high-risk aging that includes a high amyloid load, neuroinflammation, and diet-induced obesity to test hypotheses on underlying mechanisms. RESULTS: We found that neddylation and subsequent activation of cullin-RING ligase complexes induced synaptic insulin resistance through ubiquitylation and degradation of the insulin-receptor substrate IRS1 that organizes synaptic insulin signaling. Accordingly, inhibition of neddylation preserved synaptic insulin signaling and rescued memory deficits in mice with a high amyloid load, which were fed with a 'western diet'. CONCLUSIONS: Collectively, the data suggest that neddylation and degradation of the insulin-receptor substrate is a nodal point that links high amyloid load, neuroinflammation, and synaptic insulin resistance to cognitive decline and impaired synaptic plasticity in high-risk aging.


Asunto(s)
Enfermedad de Alzheimer , Resistencia a la Insulina , Enfermedad de Alzheimer/genética , Enfermedad de Alzheimer/metabolismo , Animales , Trastornos de la Memoria , Ratones , Enfermedades Neuroinflamatorias , Proteolisis
12.
Top Catal ; : 1-9, 2022 Jan 20.
Artículo en Inglés | MEDLINE | ID: mdl-35075339

RESUMEN

Selective, sensitive, easy, and fast voltammetric techniques were developed for the analysis of Hydroxychloroquine (HCQ). These analysis were carried out at sodium dodecyl sulphate modified carbon nanotube paste electrode (SDSMCNTPE) using an aqueous 0.2 M phosphate buffer solution as supporting electrolyte. The field emission-scanning electron microscopy, cyclic voltammetry (CV), and electrochemical impedance spectroscopy were used for material characterization. A minute quantity of the SDS surfactant was sufficient to convey an outstanding electrocatalytic action to the electrochemical oxidation nature of HCQ. The HCQ molecule parades only electrochemical oxidation (irreversible) with the transfer of two electrons. The detection of HCQ was carried out through CV method at SDSMCNTPE and bare carbon nanotube paste electrode (BCNTPE). The corresponding analytical curve offered a decent linear nature in the considered HCQ concentration range (10-40 µM) and the detection limit was found to be 0.85 µM. The significant peak to peak split-up was observed between HCQ and interferents with a decent sensitivity and stability. The SDSMCNTPE to be an approachable electrode for the usage in the examination of HCQ independently and in the presence of paracetamol (PC) and ascorbic acid (AA). Thus, they were used to determine HCQ in pharmaceutical formulations and the results that showed good agreement with comparative methods. Furthermore, a mechanism for HCQ electro-oxidation was proposed.

13.
Diagn Interv Imaging ; 103(7-8): 367-374, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35033489

RESUMEN

PURPOSE: The purpose of this study was to evaluate the efficacy of cone-beam computed tomography (CBCT) navigation to achieve percutaneous screw fixation (PSF) of pelvic bone metastases (PBM). MATERIALS AND METHODS: Thirty-five consecutive patients (12 men and 23 women; mean age, 62 ± 11.3 [SD]; range: 39-89 years) treated between 2019 and 2021 were retrospectively included. CBCT navigation software was systematically used. Manual drawing of the entry point (MDEP) was performed when CBCT automatic positioning failed. Influence of metastasis pattern, ablation, body mass index, number of screws, and MDEP on procedure duration (PD) and total Air Kerma (AK) was evaluated. Local pain was assessed before, one and six months after treatment. Variables were compared using Pearson correlation, Student t and Wilcoxon tests. RESULTS: Seventy-five screws were inserted successfully (mean: 2.1 ± 1.1 [SD]; range: 1-5 per patient). CBCT automatic positioning was obtained for 41 screws (55%, 41/75), whereas 34 (45%, 34/75) required MDEP. Mean procedure duration, fluoroscopy time, kerma air product and AK were 73.3 ± 44.8 (SD) min (range: 19-233 min), 13.1 ± 9.5 (SD) min (range: 1.4-38.6 min), 73.8 ± 66.3 (SD) Gy.cm2 (range: 11.6-303.7 Gy.cm2) and 301.7 ± 242.1 (SD) mGy (range: 49.4-1111.5 mGy), respectively. Procedure duration was not significantly longer in patients with mixed or blastic PBM compared to those with lytic PBM or when performing ablation, and no significant correlations were observed with the number of screws inserted (P = 0.19), MDEP (P = 0.37) and BMI (P = 0.44). No adverse events were reported during the follow-up (median: 6 months; IQR: 6-6.5 months). Thirteen patients died during the follow-up related to cancer progression. Local pain decreased from 35 ± 32 (SD) mm (range: 0-10 mm) to 11 ± 20 (SD) mm (range: 0-80 mm) at one month (P = 0.001); and to 22 ± 23 (SD) mm (range: 0-60 mm) at six months (P = 0.001). CONCLUSION: CBCT navigation allows to effectively performing PSF of PBM even in the presence of steep angulations.


Asunto(s)
Huesos Pélvicos , Cirugía Asistida por Computador , Adulto , Anciano , Anciano de 80 o más Años , Tornillos Óseos , Tomografía Computarizada de Haz Cónico/métodos , Femenino , Fluoroscopía/métodos , Humanos , Masculino , Persona de Mediana Edad , Dolor , Huesos Pélvicos/diagnóstico por imagen , Estudios Retrospectivos , Cirugía Asistida por Computador/métodos
15.
Artículo en Inglés | WPRIM (Pacífico Occidental) | ID: wpr-977620

RESUMEN

Aims@#This study was designed to evaluate the effectiveness of the synthesised carvacrol loaded chitosan nanoparticles (CLCNPs) on the growing and pre-formed biofilms of Listeria monocytogenes isolated from slaughterhouses.@*Methodology and results@#The swab samples were collected from knives, hocks and cutting tables representing slaughterhouses meat contact surfaces (MCS), while those samples from walls and floors represent slaughterhouses meat non-contact surfaces (MNCS). The bacteriological analysis revealed the existence of L. monocytogenes with a prevalence rate of 3.3, 10 and 6.7% for knives, hocks and cutting tables, respectively and 2.2 and 6.6% for walls and floors, respectively. The isolates L. monocytogenes were assayed for biofilm production by the crystal violet binding assay method. Among the 10 L. monocytogenes isolates, 10%, 50% and 30% of the isolates were found to be strong, moderate and weak biofilm producers, respectively. The activities of carvacrol, chitosan nanoparticles (NPs) and CLCNPs against the only strong biofilm producer strain of L. monocytogenes were tested by microtiter plate assay. The minimum inhibitory concentrations (MIC) values were 3.75 mg/mL for CAR, 5 mg/mL for chitosan NPs and 0.62 mg/mL for CLCNPs. CLCNPs inhibit the produced biofilm by 35.79, 73.37 and 77.76%, when 0.5 MIC, 1 MIC and 2 MIC were used, respectively. Furthermore, the pre-formed L. monocytogenes biofilms were significantly reduced from 1.01 (control) OD570 to 0.40 and 0.29 OD570 by applying 2 MIC and 4 MIC doses, respectively.@*Conclusion, significance and impact of study@#The data generated is promising to develop bio-green disinfectants to inhibit biofilm formation by L. monocytogenes in the food processing environment and control its adverse effects for consumers.


Asunto(s)
Listeria monocytogenes , Nanopartículas
16.
Artículo en Inglés | WPRIM (Pacífico Occidental) | ID: wpr-979285

RESUMEN

Aims@#This study aimed to investigate the effect of acidic electrolyzed water (AEW) as pre-refrigeration and pre-freezing processing steps for chicken meat in regard to the behavior of S. Typhimurium and E. coli during storage.@*Methodology and results@#AEW (free available chlorine 30 ppm and pH 2.7) was tested against S. Typhimurium and E. coli in growth media (brain heart infusion broth) and by exposing inoculated chicken fillets. The in vitro study appointed 10 minutes as the straightening exposure time of fresh prepared AEW for S. Typhimurium and E. coli. The reduction effect of AEW was significant (p<0.05) for both S. Typhimurium and E. coli along the 8 days of refrigerated storage with a maximum reduction after 24 h of post-treatment reaching 23.3% (1.4 log CFU/g) and 32.43% (2.15 log CFU/g) for S. Typhimurium and E. coli, respectively. AEW resulted in a significant reduction (p<0.05) as a pre-freezing application for both microorganisms, where the maximum reductions of 20% (1.2 log CFU/g) and 31.84% (2.14 log CFU/g) for S. Typhimurium and E. coli, respectively, were reported at zero time (just after dipping). In exposed samples to AEW, S. Typhimurium could not be detected by the 6th week of frozen storage while E. coli continued detectable until till 10th week but with a reduced population of 30% compared to control.@*Conclusion, significance and impact of study@#The findings of the present study suggest the application of AEW as a pre-refrigeration and pre-freezing treatment for chicken products. AEW application significantly improved the safety of chicken products.


Asunto(s)
Electrólitos , Salmonella typhimurium , Escherichia coli
17.
Int J Crit Illn Inj Sci ; 11(3): 123-133, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34760658

RESUMEN

BACKGROUND: Acute kidney injury (AKI) is repeatedly observed in ventilated critically ill patients with coronavirus disease-2019 (COVID-19) pneumonia. This study aimed to determine the incidence, risk factors, and consequences of AKI in the ventilated critically ill adult patients with COVID-19 pneumonia. METHODS: This retrospective study included all the ventilated critically ill adult patients with COVID-19 pneumonia from March 1, 2020, to June 1, 2020. Data were collected from the electronic medical system. AKI was diagnosed using the Kidney Disease: Improving Global Outcomes 2012 Clinical Practice definition. Patients were followed 90 days from the intensive care unit (ICU) admission time or to the date when they were discharged from the hospital. RESULTS: AKI occurred in 65.1% of patients, with 26.6% of these started on continuous renal replacement therapy (CRRT). Patients with AKI had higher comorbidity and illness severity scores (P < 0.001). Age and the vasopressor requirements were predictors of AKI (P= 0.016 and P = 0.041) and hypertension predicted AKI (P = 0.099) and its progression (P = 0.05). The renal recovery rate was 86.7% and was associated with the mean arterial pressure on ICU admission in the no-CRRT group (P = 0.014) and the hypoxic index in the CRRT group (P = 0.019). AKI was associated with higher mortality (P = 0.017) and significantly longer ICU length-of-stay (P = 0.001). Additionally, AKI patients were more often discharged to a long-term skilled nursing facility (P = 0.005). CONCLUSION: COVID-19-associated AKI was common and associated with poor outcome, with the specific mechanisms being the main driving factors.

18.
Sensors (Basel) ; 21(22)2021 Nov 09.
Artículo en Inglés | MEDLINE | ID: mdl-34833522

RESUMEN

The current study presents three calibration approaches for the hole-drilling method (HDM). A total of 72 finite element models and 144 simulations were established to calibrate the measurements of the strain sensors. The first approach assumed the stresses acted on the boundaries of the drilled hole and thus analyzed the surrounding displacements field. The second analysis considered the loads on the outer surfaces of the specimen while measuring the strains' differences between the model with and without the drilled hole. The third approach was more comprehensive as it considered the mechanical and thermal effects of the drilling operations. The proposed approaches were applied to two different materials (AISI 1045 and CFRP). The steel specimens were machined using a CNC lathe while the composite laminates were manufactured using the robotic fiber placement (RFP) process. Subsequently, the residual stresses (RSs) were measured using the HDM. The obtained data were compared with X-ray diffraction measurements for validation. The results showed better estimation of the RSs when utilizing the third approach and clear underestimation of the stresses using the second approach. A divergence in RSs values between the three approaches was also detected when measuring the stresses in the internal layers of the composite laminates.

20.
Medicina (Kaunas) ; 57(9)2021 Aug 30.
Artículo en Inglés | MEDLINE | ID: mdl-34577830

RESUMEN

Background and objectives: Cancer-related vertebral compression fractures (VCF) may cause debilitating back pain and instability, affecting the quality of life of cancer patients. To further drive cement deposition during vertebroplasty, the aims of this restrospective case series study were to report the feasibility, safety and short term efficacy (≤6 months) of percutaneous vertebral fixation in cancer-related vertebral compression fractures using various intravertebral implants. Methods: All consecutive cancer patients treated with percutaneous vertebral fixation for VCF were retrospectively included. Various devices were inserted percutaneously under image guidance and filled by cement. Descriptive statistics were used and a matched paired analysis of pain scores was performed to assess for changes following interventions. Results: A total of 18 consecutive patients (12 women (66.6%) and 6 men (33.3%); mean age 59.7 ± 15.5 years) were included. A total of 42 devices were inserted in 8 thoracic and 16 lumbar vertebrae. Visual analogue scale measurement significantly improved from 5.6 ± 1.8 preoperatively to 1.5 ± 1.7 at 1 week (p < 0.01) and to 1.5 ± 1.3 at 6 months (p < 0.01). No severe adverse events were observed, but three adjacent fractures occurred between 1 week and 5 months after implantation. Conclusions: Percutaneous vertebral fixation of cancer-related VCF is feasible and safe and allows pain relief.


Asunto(s)
Fracturas por Compresión , Neoplasias , Fracturas de la Columna Vertebral , Adulto , Anciano , Femenino , Fracturas por Compresión/diagnóstico por imagen , Fracturas por Compresión/etiología , Fracturas por Compresión/cirugía , Humanos , Vértebras Lumbares/diagnóstico por imagen , Vértebras Lumbares/lesiones , Vértebras Lumbares/cirugía , Masculino , Persona de Mediana Edad , Calidad de Vida , Estudios Retrospectivos , Fracturas de la Columna Vertebral/diagnóstico por imagen , Fracturas de la Columna Vertebral/etiología , Fracturas de la Columna Vertebral/cirugía , Resultado del Tratamiento
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