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1.
BMC Public Health ; 24(1): 1623, 2024 Jun 18.
Artículo en Inglés | MEDLINE | ID: mdl-38890592

RESUMEN

BACKGROUND: The rapid development of the telecommunications industry in the post-COVID-19 era has brought tremendous pressure to employees making them a high-risk group for job burnout. However, prior research paid less attention to the burnout of employees. Furthermore, social support and gender have separate effects on job burnout. This study explores the mechanism of stress perception on job burnout and examines the roles of social support and gender amid it. METHOD: This cross-sectional study was conducted from June 2023 to August 2023 in mainland China. A total of 39,507 were recruited by random sampling and online questionnaires, and 28,204 valid questionnaires were retained. SPSS (version 26.0) and PROCESS (Model 4 & 7) were used for correlation analysis, mediation analysis, and mediated moderation analysis. RESULT: Stress perception can positively predict the level of job burnout of employees in the telecommunications industry, and social support plays a partial mediating role, accounts for 8.01% of the total effect, gender moderates the first half of the path in this mediation model. At the same pressure level, female can perceive more social support than male. CONCLUSIONS: Under high pressure background, employees' job burnout varies depending on gender and the perception of social support. Therefore, telecommunications industry managers should adopt decompression measures and targeted social support resources for different groups.


Asunto(s)
Agotamiento Profesional , Apoyo Social , Humanos , Masculino , Femenino , Agotamiento Profesional/psicología , Estudios Transversales , Adulto , China/epidemiología , Persona de Mediana Edad , Telecomunicaciones , Encuestas y Cuestionarios , Factores Sexuales , Análisis de Mediación , Estrés Laboral/psicología , COVID-19/psicología , COVID-19/epidemiología
2.
Reprod Sci ; 31(6): 1719-1731, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38396297

RESUMEN

Diabetes is known to negatively affect male reproduction. Recent clinical results have confirmed that mesenchymal stem cell (MSC)-based therapies are safe and effective for the treatment of diabetes. However, the effect and potential mechanism through which MSC transplantation improves diabetes-derived male reproductive dysfunction are still unknown. In the present study, we first established a male T1D mouse model through intraperitoneal injection of streptozotocin for five consecutive days. Subsequently, we evaluated the blood glucose levels, fertility, and histology and immunology of the pancreas, testes, and penis of T1D mice with or without transplantation of menstrual blood-derived endometrial stem cells (MenSCs) or umbilical cord mesenchymal stem cells (UCMSCs). Glucose was added to the medium in which the Leydig cells were cultured to imitate high glucose-injured cell viability. Subsequently, we evaluated the cellular viability, ROS levels, and mitochondrial membrane potential of Leydig cells treated with or without MenSC-conditioned medium (MenSC-CM) using a CCK8 assay, immunofluorescence, and flow cytometry. The targeted proteins are involved in the potential mechanism underlying MenSC-derived improvements, which was further validated via Western blotting. Collectively, our results indicated that MenSC transplantation significantly ameliorated reproductive dysfunction in male T1D mice by enhancing cellular antioxidative capacity and promoting angiogenesis. This study provides solid evidence and support for the application of MSCs to improve diabetes-induced male reproductive dysfunction.


Asunto(s)
Diabetes Mellitus Experimental , Endometrio , Animales , Masculino , Ratones , Diabetes Mellitus Experimental/terapia , Femenino , Endometrio/metabolismo , Endometrio/patología , Células Intersticiales del Testículo/metabolismo , Antioxidantes/farmacología , Infertilidad Masculina/terapia , Diabetes Mellitus Tipo 1/metabolismo , Diabetes Mellitus Tipo 1/terapia , Trasplante de Células Madre Mesenquimatosas/métodos , Especies Reactivas de Oxígeno/metabolismo , Ratones Endogámicos C57BL
3.
Front Endocrinol (Lausanne) ; 14: 1285929, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-38093955

RESUMEN

For the general population, increasing potassium intake can reduce the incidence of cardiovascular and cerebrovascular diseases. However, since hyperkalemia is a common and life-threatening complication in maintenance hemodialysis patients, which can increase the risk of malignant arrhythmia and sudden death, the current mainstream of management for hemodialysis patients is dietary potassium restriction in order to prevent hyperkalemia. Hemodialysis patients are usually advised to reduce dietary potassium intake and limit potassium-rich fruits and vegetables, but there is limited evidence to support this approach can reduce mortality and improve quality of life. There is still no consistent conclusion on the association between dietary potassium intake and serum potassium and survival in hemodialysis patients. According to the current small observational studies, there was little or even no association between dietary potassium intake and serum potassium in hemodialysis patients when assurance of adequate dialysis and specific dietary patterns (such as the plant-based diet mentioned in the article) are being followed, and excessive dietary potassium restriction may not benefit the survival of hemodialysis patients. Additionally, when assessing the effect of diet on serum potassium, researchers should not only focus on the potassium content of foods, but also consider the type of food and the content of other nutrients. However, more large-scale, multi-center clinical trials are required to provide high-quality evidence support. Besides, further research is also needed to determine the optimal daily potassium intake and beneficial dietary patterns for hemodialysis patients.


Asunto(s)
Hiperpotasemia , Fallo Renal Crónico , Humanos , Hiperpotasemia/complicaciones , Hiperpotasemia/prevención & control , Fallo Renal Crónico/terapia , Potasio , Potasio en la Dieta , Calidad de Vida , Diálisis Renal
5.
Membranes (Basel) ; 13(8)2023 Jul 28.
Artículo en Inglés | MEDLINE | ID: mdl-37623766

RESUMEN

Electromembrane extraction (EME) is a miniaturized extraction technique that has been widely used in recent years for the analysis and removal of pollutants in the environment. It is based on electrokinetic migration across a supported liquid membrane (SLM) under the influence of an external electrical field between two aqueous compartments. Based on the features of the SLM and the electrical field, EME offers quick extraction, effective sample clean-up, and good selectivity, and limits the amount of organic solvent used per sample to a few microliters. In this paper, the basic devices (membrane materials and types of organic solvents) and influencing factors of EME are first introduced, and the applications of EME in the analysis and removal of environmental inorganic ions and organic pollutants are systematically reviewed. An outlook on the future development of EME for environmental applications is also given.

6.
Drug Des Devel Ther ; 17: 181-190, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36712946

RESUMEN

The mineralocorticoid receptor antagonist spironolactone has been shown to improve cardiac function and reverse left ventricular hypertrophy in heart failure patients, but there are no consistent findings on the efficacy and safety in hemodialysis patients. Abnormal aldosterone secretion plays a critical role in the formation of left ventricular hypertrophy. Because of the existence of "aldosterone escape", the routine use of angiotensin-converting enzyme inhibitors/angiotensin receptor blockers does not completely inhibit aldosterone secretion. Low-dose spironolactone (25 mg/d) has been found in small-sample clinical studies to have a significant positive impact with respect to decreasing left ventricular mass index, increasing left ventricular ejection fraction, reversing left ventricular hypertrophy, and improving cardiovascular function while still being safe. More prospective multicenter clinical trials with large sample sizes are needed, however, to provide convincing evidence.


Asunto(s)
Insuficiencia Cardíaca , Espironolactona , Humanos , Espironolactona/efectos adversos , Hipertrofia Ventricular Izquierda/tratamiento farmacológico , Aldosterona/farmacología , Aldosterona/uso terapéutico , Volumen Sistólico , Estudios Prospectivos , Función Ventricular Izquierda , Insuficiencia Cardíaca/tratamiento farmacológico , Insuficiencia Cardíaca/complicaciones , Diálisis Renal/efectos adversos , Estudios Multicéntricos como Asunto
7.
Front Neurol ; 14: 1307296, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-38264091

RESUMEN

Background: The new antiseizure medications (ASMs) and non-invasive brain stimulation (NIBS) are controversial in controlling seizures. So, this network meta-analysis aimed to evaluate the efficacy and safety of five third-generation ASMs and two NIBS therapies for the treatment of refractory epilepsy. Methods: We searched PubMed, EMBASE, Cochrane Library and Web of Science databases. Brivaracetam (BRV), cenobamate (CNB), eslicarbazepine acetate (ESL), lacosamide (LCM), perampanel (PER), repetitive transcranial magnetic stimulation (rTMS), and transcranial direct current stimulation (tDCS) were selected as additional treatments for refractory epilepsy in randomized controlled studies and other cohort studies. Randomized, double-blind, placebo-controlled, add-on studies that evaluated the efficacy or safety of medication and non-invasive brain stimulation and included patients with seizures were uncontrolled by one or more concomitant ASMs were identified. A random effects model was used to incorporate possible heterogeneity. The primary outcome was the change in seizure frequency from baseline, and secondary outcomes included the proportion of patients with ≥50% reduction in seizure frequency, and the rate of treatment-emergent adverse events. Results: Forty-five studies were analyzed. The five ASMs and two NIBS decreased seizure frequency from baseline compared with placebo. The 50% responder rates of the five antiseizure drugs were significantly higher than that of placebo, and the ASMs were associated with fewer adverse events than placebo (p < 0.05). The surface under the cumulative ranking analysis revealed that ESL was most effective in decreasing the seizure frequency from baseline, whereas CNB provided the best 50% responder rate. BRV was the best tolerated. No significant publication bias was identified for each outcome index. Conclusion: The five third-generation ASMs were more effective in controlling seizures than placebo, among which CNB, ESL, and LCM were most effective, and BRV exhibited better safety. Although rTMS and tDCS did not reduce seizure frequency as effectively as the five drugs, their safety was confirmed. Systematic review registration: PROSPERO, https://www.crd.york.ac.uk/prospero/ (CRD42023441097).

8.
Clin Neurol Neurosurg ; 223: 107524, 2022 12.
Artículo en Inglés | MEDLINE | ID: mdl-36403339

RESUMEN

BACKGROUND AND PURPOSE: PPP2R5D mutations are known to cause neurodevelopmental disorders in an autosomal-dominant manner. To date, the vast majority of the reported cases in the literature have been sporadic with de novo mutations. There are no data regarding PPP2R5D mutation penetrance. We aimed to unravel the underlying genetic defects in 3 generations of a family affected by intellectual disability, neurodevelopmental delay, and facial dysmorphology. METHODS: We performed detailed clinical examinations and whole-exome sequencing in the family. RESULTS: We identified a novel mutation, c.1321 C>T (p.Arg441*), in PPP2R5D. The mutation cosegregated with affected family members I-2 and II-7 but not II-3, who bears the mutation but is phenotypically healthy. Our whole-exome sequencing also excluded the involvement of pathogenic mutations in other genes known to be related to neurodevelopmental disorders. The mutation was predicted to introduce a premature stop codon at position 441, thereby truncating the 162 amino acids at the C-terminus of the encoded protein. CONCLUSIONS: We report a familial transmitted PPP2R5D-related neurodevelopmental disorder as well as a novel nonsense pathogenic mutation and its incomplete penetrance. Our study expands the mutational and phenotypic spectra of PPP2R5D-related neurodevelopmental disorders, broadens our understanding of these disorders, and will thus be valuable for mutation-based pre- and postnatal screening and genetic diagnosis of neurodevelopmental disorders.


Asunto(s)
Codón sin Sentido , Trastornos del Neurodesarrollo , Humanos , Linaje , Codón sin Sentido/genética , Penetrancia , Trastornos del Neurodesarrollo/genética , China , Proteína Fosfatasa 2/genética
9.
Chem Commun (Camb) ; 58(83): 11649-11652, 2022 Oct 18.
Artículo en Inglés | MEDLINE | ID: mdl-36129144

RESUMEN

Inducing amorphous components into Al2O3 leads to elongation of the Al-O bond and the formation of oxygen vacancies, which makes Al2O3 an independent photocatalyst for CO2 adsorption and reduction. The generation rate of CO can reach 36.5 µmol g-1 h-1, which is 6.5 times that of P25 TiO2.

10.
Front Med (Lausanne) ; 9: 959129, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35983090

RESUMEN

Background: Transbronchial cryobiopsy (TBCB) is a critical procedure in the diagnosis of interstitial lung diseases (ILD). The associations between high-resolution computed tomography (HRCT) features and outcomes of TBCB were unknown. Methods: This study was conducted as a single-center prospective cohort study between September 2018 and January 2020 (NCT04047667). HRCT was obtained before performing TBCB. The clinical and radiological characteristics, complications, pathological and multidisciplinary discussion (MDD) diagnoses were recorded. The relationships between HRCT features and outcomes of TBCB were analyzed. Results: TBCB was performed on 216 ILD patients. The radiological features usually interstitial pneumonia (UIP) or probable UIP, indeterminate for UIP, ground-glass opacities (GGO) and cysts were found in 55 (25.5%), 38 (17.6%), 84 (38.9%) and 9 (4.2%) patients, respectively. And 118 (54.6%) patients had high HRCT score (involved lung proportion ≥50%) in the biopsied lobe. Multivariate analysis suggested radiological probable UIP pattern may be an independent risk factor for moderate bleeding (OR = 4.304; 95% CI: 1.383-13.393; P = 0.012), while GGO may be a protective factor from moderate bleeding (OR = 0.173, 95% CI: 0.043-0.687; P = 0.013). The pathological diagnostic yield in patients presenting cysts on HRCT was significantly lower than others (44.4 vs. 87.9%; P = 0.009). While performing TBCB in the lobe with high HRCT score increased pathological diagnostic yield (91.5 vs. 79.6%; P = 0.022). Neither pneumothorax nor MDD diagnostic yields were found to be associated with HRCT features. Conclusions: HRCT features were associated with moderate bleeding and pathological diagnosis. Pre-TBCB assessments of HRCT pattern and scores were helpful for bronchoscopists to make a better patient selection and procedure planning.

11.
Front Public Health ; 10: 889819, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36003636

RESUMEN

Objective: The study aimed to understand the distribution of health problems of a general practice clinic to provide guidance on how to develop primary care in Shenzhen, China. Study design: This is a cross-sectional study. Methods: Patients' sociodemographic data and diagnoses were recorded from the electronic medical record system of the University of Hong Kong-Shenzhen Hospital from Jan 2014 to Dec 2020 and coded using the International Classification of Primary Care-2. Descriptive statistics were used to describe the distribution of health problems. Results: A total of 368,167 health problems were recorded. Respiratory, digestive, musculoskeletal, general, and cardiovascular were the top five categories, which accounted for 67.71% of the total in this study. Acute upper respiratory tract infection (AURTI) was the most common health problem (6.67%). Chronic diseases, including hypertension and diabetes mellitus, accounted for about 7% of all health problems. The proportion of cardiovascular problems increased significantly with age (r = 0.96, P < 0.05). The proportion of consultations for mental health problems was low in all age groups. Conclusions: The results represent an understanding of the common health problems of patients in Shenzhen city, which can provide a reference for preventing diseases and developing primary care.


Asunto(s)
Pacientes Ambulatorios , Infecciones del Sistema Respiratorio , China , Estudios Transversales , Hospitales , Humanos
12.
Int Ophthalmol ; 42(11): 3421-3430, 2022 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-35960463

RESUMEN

PURPOSE: To identify the spectrum of RB1 gene mutations in 114 Chinese patients with retinoblastoma. METHODS: Genomic DNA was extracted from the peripheral blood of 114 Rb patients. Polymerase chain reactions (PCRs) followed by direct Sanger sequencing were used to screen for mutations in the RB1 gene, which contains 26 exons with flanking intronic sequences, except exon 15. Clinical data, including gender, age at diagnosis, laterality of ocular lesions, and associated symptoms, were recorded and compared. RESULTS: We identified five novel mutations in the RB1 gene. Twenty-five other mutations found in this study have been previously reported. A higher rate of RB1 mutations, with 47.3% of mutations among bilaterally affected patients vs. 6.8% within unilaterally affected patients, was also observed (p < 0.0001). Bilaterally affected patients were diagnosed earlier when compared to unilaterally affected patients (11 ± 7 months versus 20 ± 14 months, p = 0.0002). Furthermore, nonsense mutations were abundant (n = 14), followed by frameshift mutations (n = 8), splicing site mutations (n = 5), while missense mutations were few (n = 3). CONCLUSIONS: We found five novel mutations in RB1 genes, which expands the mutational spectrum of the gene. Children with bilateral Rb exhibited higher mutation rates and were diagnosed earlier than those with unilateral Rb. These findings will inform clinical diagnosis and genetic therapeutic targeting in Rb patients.


Asunto(s)
Neoplasias de la Retina , Retinoblastoma , Humanos , Retinoblastoma/diagnóstico , Codón sin Sentido , Análisis Mutacional de ADN , Estudios de Asociación Genética , Mutación , Neoplasias de la Retina/diagnóstico , China/epidemiología , Ubiquitina-Proteína Ligasas/genética , Proteínas de Unión a Retinoblastoma/genética
13.
J Chromatogr A ; 1675: 463171, 2022 Jul 19.
Artículo en Inglés | MEDLINE | ID: mdl-35623195

RESUMEN

Flavour additives with carboxyl and hydroxyl groups (FACHs), the key ingredients in characteristic flavours, are frequently detected in cigarette smoke. They are attracting increasing attention in regulating the flavour additives used in tobacco to curb youth tobacco use and prevent the use of additives that are harmful. In this study, a highly robust, sensitive, and precise method based on silylation and GC-MS/MS with an improved backflushing system was developed for the simultaneous analysis of 171 FACHs in cigarette smoke. Silylation has been shown to have advantages in terms of high selectivity and sensitivity to chemicals with carboxyl and hydroxyl groups, especially when combined with GC-MS/MS. The extraction and silylation conditions were optimised. Dichloromethane was used as the extraction agent. BSTFA in combination with 1% TMCS and 0.2% TMSI was selected as silylating agent for high silylation efficiency, particularly for hindered analytes. The method has been validated. The limit of detection (LOD) ranged from 0.6 to 332.3 ng/mL. 91.1% out of the analytes in QC samples had precisions lower than 10% during one month run. The improved backflushing system with a fused silica splitter was shown to be crucial in the excellent long-term robustness of the method. The developed method was used to determine flavour additives in 270 practical cigarette smoke samples with reliable results. A total of 154 FACHs were identified with wide-range levels among different cigarette brands.


Asunto(s)
Fumar Cigarrillos , Aromatizantes , Aromatizantes/análisis , Cromatografía de Gases y Espectrometría de Masas/métodos , Espectrometría de Masas en Tándem/métodos , Nicotiana/química
14.
J Chromatogr A ; 1668: 462913, 2022 Apr 12.
Artículo en Inglés | MEDLINE | ID: mdl-35247721

RESUMEN

Magnetic carbon composite (Fe3O4@C) was synthesized and applied as a reversed-dispersive solid-phase extraction sorbent for the simultaneous analysis of 40 pesticide residues in tobacco by ultrahigh-performance liquid chromatography coupled to quadrupole time-of-fight mass spectrometry. Compared to the traditional QuEChERS method, the optimized Fe3O4@C simplified clean-up process and exhibited better clean-up capability than conventional sorbents. The pesticides were qualitatively identified by accurate mass of protonated molecules, fragment ions, isotopic peak clusters, and retention time, and quantitatively determined by matrix-matched external standard method. Good linearity of the proposed method was obtained with R value greater than 0.997 for all target pesticides at concentration levels of 2-200 µg/L. The limit of detection ranged from 0.14 to 2.67 µg/kg. The recoveries and relative standard deviations of all target pesticides at three spiked concentrations of 20, 50 and 200 µg/kg were in the ranges of 80.8%-113.3% and 0.6%-16.3%, respectively. Compared with the reported methods for the analysis of multiple pesticide residues in tobacco, the proposed method has the advantages of simple to operate, high clean-up ability and less time-consuming in clean-up process.


Asunto(s)
Residuos de Plaguicidas , Carbono/análisis , Cromatografía Liquida , Fenómenos Magnéticos , Espectrometría de Masas , Residuos de Plaguicidas/análisis , Extracción en Fase Sólida/métodos , Nicotiana
15.
World J Stem Cells ; 14(1): 104-116, 2022 Jan 26.
Artículo en Inglés | MEDLINE | ID: mdl-35126831

RESUMEN

BACKGROUND: Type 1 diabetes (T1D), a chronic metabolic and autoimmune disease, seriously endangers human health. In recent years, mesenchymal stem cell (MSC) transplantation has become an effective treatment for diabetes. Menstrual blood-derived endometrial stem cells (MenSC), a novel MSC type derived from the decidual endometrium during menstruation, are expected to become promising seeding cells for diabetes treatment because of their noninvasive collection procedure, high proliferation rate and high immunomodulation capacity. AIM: To comprehensively compare the effects of MenSC and umbilical cord-derived MSC (UcMSC) transplantation on T1D treatment, to further explore the potential mechanism of MSC-based therapies in T1D, and to provide support for the clinical application of MSC in diabetes treatment. METHODS: A conventional streptozotocin-induced T1D mouse model was established, and the effects of MenSC and UcMSC transplantation on their blood glucose and serum insulin levels were detected. The morphological and functional changes in the pancreas, liver, kidney, and spleen were analyzed by routine histological and immunohistochemical examinations. Changes in the serum cytokine levels in the model mice were assessed by protein arrays. The expression of target proteins related to pancreatic regeneration and apoptosis was examined by western blot. RESULTS: MenSC and UcMSC transplantation significantly improved the blood glucose and serum insulin levels in T1D model mice. Immunofluorescence analysis revealed that the numbers of insulin+ and CD31+ cells in the pancreas were significantly increased in MSC-treated mice compared with control mice. Subsequent western blot analysis also showed that vascular endothelial growth factor (VEGF), Bcl2, Bcl-xL and Proliferating cell nuclear antigen in pancreatic tissue was significantly upregulated in MSC-treated mice compared with control mice. Additionally, protein arrays indicated that MenSC and UcMSC transplantation significantly downregulated the serum levels of interferon γ and tumor necrosis factor α and upregulated the serum levels of interleukin-6 and VEGF in the model mice. Additionally, histological and immunohistochemical analyses revealed that MSC transplantation systematically improved the morphologies and functions of the liver, kidney, and spleen in T1D model mice. CONCLUSION: MenSC transplantation significantly improves the symptoms in T1D model mice and exerts protective effects on their main organs. Moreover, MSC-mediated angiogenesis, antiapoptotic effects and immunomodulation likely contribute to the above improvements. Thus, MenSC are expected to become promising seeding cells for clinical diabetes treatment due to their advantages mentioned above.

16.
Environ Technol ; 43(4): 572-584, 2022 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-32674672

RESUMEN

In this work, we used cathodic microarc plasma electrolysis (CMPE) to degrade 2,4-dichlorophenol (2,4-DCP) in simulated wastewater. By investigating and comparing the removal efficiencies and chemical oxygen demand (COD) during the degradation process, higher bath voltage and alkaline condition were considered as more suitable for the 2,4-DCP decomposition. Higher initial 2,4-DCP concentration was attributed to the increase in the utilisation of the energy input. The plasma characteristics during CMPE were studied by optical emission spectroscopy (OES). It was found that the 2,4-DCP directly participated in the plasma discharge process. Furthermore, by studying the evolution of intermediate products at different experimental parameters, it was found that the existence of Cl- played an important role in the opening of benzene ring, which activated the ortho-substitutions of hydroxyl, meanwhile accelerated the p-substitutions. The instantaneous high temperature and high pressure and the Cl- that were generated and driven by cathodic plasma made the decomposition of 2,4-DCP much quicker.


Asunto(s)
Clorofenoles , Contaminantes Químicos del Agua , Electrólisis , Fenoles , Aguas Residuales
17.
JACS Au ; 1(10): 1700-1707, 2021 Oct 25.
Artículo en Inglés | MEDLINE | ID: mdl-34723273

RESUMEN

Probing and tuning the electron tunneling in metal electrode-insulator-metal nanoparticle systems provide a unique vision for understanding the fundamental mechanism of electrochemistry and broadening the horizon in practical applications of molecular electronics in many electrochemical systems. Here we report a plasmonic imaging technique to monitor the local double-layer charging of individual Au nanoparticles deposited on gold electrode separated by monolayer of n-alkanethiol molecules. The thickness of molecular monolayer tunes the tunneling kinetics and conductivity, which predicts the heterogeneous behavior on the modified electrode surface for different electrochemical systems. We studied the distance dependence of the electron tunneling and double layer charging processes by a plasmonic-based electrical impedance microscopy. By performing fast Fourier transform analysis of the recorded plasmonic image sequences, we can quantify the interfacial impedance of single nanoparticles and the tunneling decay constant of molecular layer. We further observed the electron neutralization dynamics during single-nanoparticle collisions on different surfaces. This optical readout of electron tunneling demonstrates an imaging approach to determine the electrical properties of metal electrode-insulator-metal nanoparticle systems, which include the electron tunneling mechanism and local impedance.

18.
Pain Ther ; 10(2): 1649-1662, 2021 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-34595723

RESUMEN

INTRODUCTION: Dexmedetomidine (DEX) as a nerve block adjuvant can significantly prolong analgesia. However, whether perineural or systemic administration of DEX is more beneficial in patients undergoing total knee arthroplasty (TKA) has not been thoroughly investigated. To this end, we evaluated the effects of perineural and systemic DEX administration on postoperative analgesia in patients undergoing TKA surgery. METHODS: We randomly assigned patients undergoing TKA under general anesthesia combined with femoral nerve block and sciatic nerve block to one of three groups: (1) ropivacaine plus perineural dexmedetomidine (DP): 0.25% ropivacaine 40 mL plus 0.5 µg/kg dexmedetomidine; (2) ropivacaine plus systemic dexmedetomidine (DS): 0.25% ropivacaine 40 mL plus systemic 0.5 µg/kg dexmedetomidine; (3) control group (C): 0.25% ropivacaine 40 mL. RESULTS: The average length of time until patients first experienced postoperative pain was significantly longer in the DP group (26.0 h [22.0-30.0 h]) than in the DS group (22.4 h [18-26.8 h]) and the control group (22.9 h [19.5-26.3 h], P = 0.001). For this result there was no significant difference between the DS and the control group. Compared with the DS and control groups, patients in the DP group had lower resting visual analogue scale (VAS) scores at 24, 48, and 72 h after surgery (P < 0.05). VAS activity scores at 12, 24, and 48 h after surgery in the DP group were lower than those in the DS and control groups, with a statistically significant difference (P < 0.05). Compared with the DS and control groups, the amount of postoperative opioids in the DP group was also significantly reduced, and the number of people needing postoperative rescue analgesia was significantly lower, with a statistical difference (P < 0.05). Meanwhile, the sleep satisfaction of patients in the DP group on the first night after surgery and the satisfaction with pain control at 72 h after surgery were both higher than those in the DS group and control group (P < 0.05). CONCLUSIONS: Perineural administration of DEX can significantly prolong the interval until patients report pain for the first time after TKA, relieve postoperative pain, reduce postoperative opioid dosage, and improve postoperative sleep quality and satisfaction with pain control. TRIAL REGISTRATION: The trial was registered at the Chinese Clinical Trial Registry, identifier ChiCTR1900025808.

19.
Chem Commun (Camb) ; 57(76): 9676-9679, 2021 Sep 23.
Artículo en Inglés | MEDLINE | ID: mdl-34555138

RESUMEN

In this paper, it is found that the preferential growth of secondary {117} facets of Bi24O31Br10 into dominant facets would lead to higher photocatalytic activity, although the original main {213} facet has a stronger molecular oxygen adsorption ability, which illustrates that the charge separation efficiency induced by dominant/secondary facet control plays a more important role than that of O2 adsorptive performance in improving activity.

20.
J Healthc Eng ; 2021: 2603842, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34367535

RESUMEN

The neural network algorithm of deep learning was applied to optimize and improve color Doppler ultrasound images, which was used for the research on elderly patients with chronic heart failure (CHF) complicated with sarcopenia, so as to analyze the effect of the deep-learning-based color Doppler ultrasound image on the diagnosis of CHF. 259 patients were selected randomly in this study, who were admitted to hospital from October 2017 to March 2020 and were diagnosed with sarcopenia. Then, all of them underwent cardiac ultrasound examination and were divided into two groups according to whether deep learning technology was used for image processing or not. A group of routine unprocessed images was set as the control group, and the images processed by deep learning were set as the experimental group. The results of color Doppler images before and after processing were analyzed and compared; that is, the processed images of the experimental group were clearer and had higher resolution than the unprocessed images of the control group, with the peak signal-to-noise ratio (PSNR) = 20 and structural similarity index measure (SSIM) = 0.09; the similarity between the final diagnosis results and the examination results of the experimental group (93.5%) was higher than that of the control group (87.0%), and the comparison was statistically significant (P < 0.05); among all the patients diagnosed with sarcopenia, 88.9% were also eventually diagnosed with CHF and only a small part of them were diagnosed with other diseases, with statistical significance (P < 0.05). In conclusion, deep learning technology had certain application value in processing color Doppler ultrasound images. Although there was no obvious difference between the color Doppler ultrasound images before and after processing, they could all make a better diagnosis. Moreover, the research results showed the correlation between CHF and sarcopenia.


Asunto(s)
Aprendizaje Profundo , Insuficiencia Cardíaca , Sarcopenia , Anciano , Insuficiencia Cardíaca/complicaciones , Insuficiencia Cardíaca/diagnóstico por imagen , Humanos , Procesamiento de Imagen Asistido por Computador , Sarcopenia/complicaciones , Sarcopenia/diagnóstico por imagen , Relación Señal-Ruido , Ultrasonografía Doppler en Color
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