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1.
Sensors (Basel) ; 22(12)2022 Jun 13.
Artigo em Inglês | MEDLINE | ID: mdl-35746243

RESUMO

A circularly polarized (CP) multi-input multioutput (MIMO) dielectric resonator (DR) antenna (DRA) with compact size and four ports is implemented. CP radiation was achieved using the deformed DR geometry excited with aperture coupled feeding. A CPDRA with a single and two ports is investigated. The defected ground structure (DGS) was incorporated into the antenna for improving the isolation between the ports. The DGS was incorporated in such a way that the required phase difference between the generated orthogonal degenerate modes is preserved. This concept could be utilized in implementing a compact four-port CP antenna. The MIMO antenna provides a 10 dB impedance bandwidth of 38% (8.5-12.5 GHz) and a 3 dB AR bandwidth of 9.32% (9.2-10.1 GHz). The gain of the implemented antenna was around 6 dBi in the band where CP radiation was achieved. The MIMO performance parameters were calculated, and their values remained within the acceptable limits. The implemented antenna could suitably be used in X-band applications.


Assuntos
Tecnologia sem Fio , Impedância Elétrica , Desenho de Equipamento
2.
Materials (Basel) ; 15(10)2022 May 16.
Artigo em Inglês | MEDLINE | ID: mdl-35629591

RESUMO

Methane Dry Reforming is one of the means of producing syngas. CeNi0.9Zr0.1O3 catalyst and its modification with yttrium were investigated for CO2 reforming of methane. The experiment was performed at 800 °C to examine the effect of yttrium loading on catalyst activity, stability, and H2/CO ratio. The catalyst activity increased with an increase in yttrium loading with CeNi0.9Zr0.01Y0.09O3 catalyst demonstrating the best activity with CH4 conversion >85% and CO2 conversion >90% while the stability increased with increases in zirconium loading. The specific surface area of samples ranged from 1-9 m2/g with a pore size of 12-29 nm. The samples all showed type IV isotherms. The XRD peaks confirmed the formation of a monoclinic phase of zirconium and the well-crystallized structure of the perovskite catalyst. The Temperature Program Reduction analysis (TPR) showed a peak at low-temperature region for the yttrium doped catalyst while the un-modified perovskite catalyst (CeNi0.9Zr0.1O3) showed a slight shift to a moderate temperature region in the TPR profile. The Thermogravimetric analysis (TGA) curve showed a weight loss step in the range of 500-700 °C, with CeNi0.9Zr0.1O3 having the least carbon with a weight loss of 20%.

3.
RSC Adv ; 12(17): 10846-10854, 2022 Mar 31.
Artigo em Inglês | MEDLINE | ID: mdl-35424981

RESUMO

The use of hydrogen as an alternative fuel is an attractive and promising technology as it contributes to the reduction of environmentally harmful gases. Finding environmentally friendly cheap active metal-based catalysts for H2 rich syngas via dry reforming of methane (DRM) for industrial applications has posed a challenge. In this paper, H2 production via CO2 reforming of methane was investigated over 5Ni/ZrO2 catalysts. The catalytic performance of all prepared catalysts was evaluated in a microtubular fixed bed reactor under similar reaction conditions (i.e., activation temperature at 700 °C, feed flow rate of 70 ml min-1, reaction temperature 700 °C for 440 min reaction time) of CO2 reforming of methane. Different characterization techniques such as; BET, CO2-TPD, TGA, XRPD, Raman, and TEM, were used. The study of the textural properties of catalysts established that the BET of pristine catalyst (5NiZr) was enhanced by the addition of modifiers and promoters. A bimodal TPR distribution in the reduction temperature range of 250-550 °C was recorded. In the CO2-TPD analysis, the strength of basicity came in this order: 5Ni15YZr > 5Ni10YZr > 5Ni5YZr > 5NiZr > 5Ni20YZr. The investigation of catalyst modifiers (MgO and Y2O3) resulted in the Y2O3 modifier improving the activity and catalytic performance better than MgO, which generated a hydrogen yield of 22%. 15% Y2O3 modifier loading gave the highest H2 yield 53% in the phase of different loadings of yttria. The study of the influence of promoters (Cs, Ga, and Sr) revealed that the catalytic performance of 5Ni15YZr catalysts promoted with Sr towards the H2 yield enhanced the activity to 62%. The promoted catalysts displayed lower carbon deposition compared to the unpromoted catalyst, which provided 25.6 wt% weight loss.

4.
Molecules ; 26(15)2021 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-34361772

RESUMO

Herein, we have developed a novel sensing electrode to detect the eco-toxic 4-nitrophenol (4-NP). Ag-doped-ZnO nanoflowers were synthesized by facile hydrothermal method and examined by several characterization techniques in order to understand the morphology, crystal structure, composition, and surface properties. Morphological results were confirmed by the formation of Ag-doped ZnO nanoflowers decorated with nanosheets. Ag-doped ZnO/glassy carbon electrode (GCE) electrode-material-matrix was used for electrochemical sensing of toxic 4-NP. Under optimized conditions, Ag-doped ZnO/GCE modified electrode exhibits high-sensitivity and selectivity compared to the bare GCE electrode. The Ag-doped ZnO/GCE modified electrode exhibits high electrocatalytic oxidation towards 4-NP. Anodic peak current of 4-NP is increased linearly by increasing the concentration of nitrophenol. Additionally, Ag-doped ZnO/GCE shows a wide range of sensitivity from 10 µM to 500 µM, and a linear calibration plot with a good detection limit of 3 µM (S/N = 3). The proposed Ag-doped ZnO/GCE modified electrode showed high sensing stability. In addition, the oxidation mechanism was studied. The obtained results revealed that the Ag-ZnO/GCE electrode could be the promising sensing electrode for 4-NP sensing.

5.
Environ Res ; 201: 111591, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-34186081

RESUMO

N2O is the most significant anthropogenic greenhouse gas, which cause the ozone depletion. Hence, the room temperature detection of N2O is highly desirable. In this work, The TCN(II)-KOH-rGO/CF modified electrode was successfully fabricated by drop coating method. The synthesized electrode was successfully characterized by SEM, TEM, FT-IR and XRD. The sensor electrode was used to detect different N2O concentration in flow conditions at room temperature. TCN(II)-KOH-rGO/CF modified electrode showed high sensitivity towards N2O, a wide range from 1ppm to 16 ppm and low detection of 1 ppm N2O were achieved for the TCN(II)-KOH-rGO/CF modified electrode. The limit of detection and the response towards this nitrogen oxide is competitive to other sensing methods. In addition, the sensitivity of the electrochemical sensor electrode was compared with the online Gas Chromatography. Additionally, the selectivity of the working electrode was analyzed and specified. The working electrode stability was analyzed for more than 30 days shows good stability. The fabricated TCN(II)-KOH-rGO/CF electrode is easier to prepare to get excellent analytical performance towards N2O. Hence, the proposed TCN(II)-KOH-rGO/CF electrode could be the suitable material for detection of N2O in the real site process.


Assuntos
Carbono , Elétrons , Fibra de Carbono , Cianetos , Grafite , Níquel , Espectroscopia de Infravermelho com Transformada de Fourier , Temperatura
6.
Environ Res ; 200: 111366, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-34029547

RESUMO

In the present research work, 2D-Porous NiO decorated graphene nanocomposite was synthesized by hydrothermal method to monitored the concentration of epinephrine (EPI). The morphology (SEM and TEM) results confirmed 2D-Porous NiO nanoparticles firmly attached over graphene nanosheets. FTIR and XPS analysis confirmed the formation of nickel oxide formation and complete reduction of GO to rGO. The electrochemical activity of the proposed NiO-rGO/GCE modified electrode on epinephrine was analyzed by simple cyclic voltammetry technique. The proposed low cost NiO-rGO/GCE modified electrode showed excellent catalytic activity over GCE and rGO/GCE electrodes. Due to its high conductivity and charge transfer ability of the NiO-rGO/GCE modified electrode exhibited high sensitivity of EPI at optimized conditions. The anodic peak current of the EPI linearly increases with increasing the concertation of EPI. A wide linear range (50 µM-1000 µM) was achieved with high correlation coefficient (R2 = 0.9986) and the limit of detection (LOD) of NiO-rGO/GCE modified electrode was calculated to be 10 µM. NiO-rGO/GCE electrode showed good stability and repeatability towards the EPI oxidation. Mainly, the proposed NiO-rGO/GCE modified electrode showed good sensitivity of EPI in the human biological fluid with high recovery percentage. The low cost, NiO-rGO/GCE electrode could be the promising sensor electrode for the detection of Epinephrine in the real samples.


Assuntos
Grafite , Técnicas Eletroquímicas , Epinefrina , Humanos , Níquel , Porosidade
7.
Virusdisease ; 32(1): 22-28, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33969153

RESUMO

Hepatitis C is a viral infection that has been declared as a global health problem by the World Health Organization. Egypt has the highest prevalence of hepatitis C virus (HCV) which results in a high morbidity and mortality from chronic liver disease, cirrhosis, and even hepatocellular carcinoma. Cities have lower rates of infection than rural areas. Studies about the abnormally high prevalence of HCV in Egypt ascribed that to the governmental campaign to treat Schistosoma. However, these treatment campaigns have stopped more than 35 years ago, which means that some other modes of transmission must have been involved. The objective of this work is to study the main reasons of HCV prevalence in the Egyptian Delta valley. A questionnaire-based study was conducted by members of the HCV Fighters project. Responses were collected from 949 volunteers (451 HCV patients and 498 healthy volunteers as control). The data were analyzed using SPSS version 19.0. The two-sample proportion test was used for statistical comparison between groups. The most probable risk factors of HCV transmission in Egypt included regular visits to dental clinics (55.2%), previous surgical operations (54.4%), former blood transfusion (52%), intrafamilial HCV infection (45.9%) and history of bilharzial infection (44.3%). Increasing public awareness about modes of transmission and risk factors of HCV infection is a must, especially within family members of HCV patients. Strict commitment to proper medical care precautions by health care practitioners is required.

8.
Environ Res ; 200: 111377, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-34058181

RESUMO

This paper reports synthesis, properties and gas sensing applications of ZnO nanoflowers and CdO-ZnO nanorices prepared by hydrothermal process. The morphological characterizations confirmed the formation of well-defined nanoflowers and nanorices structures for ZnO and CdO-ZnO nanomaterials, respectively. The structural properties revealed the wurtzite hexagonal phase of the synthesized materials. The sensor devices based on ZnO nanoflowers and CdO-ZnO nanorices were fabricated and tested towards various gases including ethanol, methanol, ammonia, carbon monoxide, methane and formaldehyde. The fabricated gas sensor based on CdO-ZnO nanorices exhibited a high response (34.5) towards 300 ppm formaldehyde gas at 350 °C compared to ZnO nanoflowers (14.5) under the same experimental conditions. The response and recovery times for ZnO nanoflowers-based sensor were~9.8 s and ~6 s while for CdO-ZnO based sensor, these were ~10s and ~6s, respectively. A rapid response (34.5) for CdO-ZnO nanorices based formaldehyde gas sensor was observed as compared to other gases such as ammonia (12.3), methanol (16.5), ethanol (20), carbon monoxide (16.3) and methane (12.4), which confirm the high-selectivity towards formaldehyde gas. Finally, a plausible formaldehyde gas sensing mechanism is proposed.


Assuntos
Nanoestruturas , Óxido de Zinco , Amônia , Formaldeído , Gases
9.
Environ Res ; 199: 111369, 2021 08.
Artigo em Inglês | MEDLINE | ID: mdl-34033833

RESUMO

Herein, we report the synthesis and characterizations of Vanadium pentoxide (V2O5) nanorods/graphene oxide (GO) nanocomposite as efficient direct solar light driven photocatalyst for the enhanced degradation of victoria blue (VB) dye. The nanocomposite was synthesized by sonochemical process and characterized using several analytical methods in order to study the structural, morphological, compositional, optical and photocatalytic properties. The X-ray diffraction studies confirmed the orthorhombic structure of V2O5 while the morphological examinations revealed the growth of V2O5 nanorods and 2D GO sheets. Interestingly, the UV studies ratify that the bandgap of the nanocomposite was reduced compared to pure GO and V2O5. Interestingly, the interaction of the V2O5 nanorods with the graphene oxide substrate and its effect on the electronic properties of the combined system, have been examined by means of theoretical calculations, based on the so called Geometry, Frequency, Noncovalent, eXtended Tight Binding (GFN-xTB) method. Studying the photocatalytic behavior of nanocomposite, we observe an almost complete degradation (97.95%) of Victoria Blue (VB) dye under direct sunlight illumination within just 90 min. The outstanding nanocomposite photocatalytic efficiency was due to the excellent transfer of interfacial charge and the suppressed recombination of charge-carrier. The kinetics of the degradation process was also analyzed by calculating the rate constant and half-life time. Finally, a possible mechanism has also been discussed for the degradation process of VB dye using nanocomposite under direct sunlight irradiation.


Assuntos
Nanocompostos , Nanotubos , Catálise , Grafite , Compostos Orgânicos , Luz Solar
10.
Am J Otolaryngol ; 42(6): 103080, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34022619

RESUMO

BACKGROUND: Acute invasive fungal rhinosinusitis (AIFRS) is aggressive morbidity affecting immunocompromised patients. Coronavirus disease 2019 (COVID-19) may allow secondary fungal disease through a propensity to cause respiratory infection by affecting the immune system leading to dysregulation and reduced numbers of T lymphocytes, CD4+T, and CD8+T cells, altering the innate immunity. The aim of this study is to evaluate the incidence of acute invasive fungal rhinosinusitis (AIFRS) in COVID-19 patients. METHODOLOGY: Data for acute invasive rhinosinusitis was obtained from the Otorhinolaryngology departments at our tertiary hospital at the period from January 2017 to December 2020. Then the risk factors of comorbid diseases and fungal types between post-COVID-19 and non-COVID-19 groups regarding the incidence of AIFRS are compared. RESULTS: Consequently, the incidence of AIFRS showed a more significant difference (P < 0.05) in post-COVID-19 patients than in non-COVID-19 especially in immunocompromised patients, diabetic, renal, and liver dysfunction patients as well as patients with risk factors of AIFRS. The most common organisms affecting patients with AIFRS are Rhizopus oryzae, Aspergillus fumigatus, and Absidia mucor. CONCLUSIONS: The incidence of AIFRS is markedly prominent in post-COVID-19 patients than in those of non-COVID-19, especially in immunocompromised, diabetic, renal, and liver dysfunction patients and patients with risk factors for rhinosinusitis.


Assuntos
COVID-19/epidemiologia , COVID-19/imunologia , Surtos de Doenças , Infecções Fúngicas Invasivas , Rinite/epidemiologia , Rinite/microbiologia , Sinusite/epidemiologia , Sinusite/microbiologia , Absidia , Doença Aguda , Idoso , Aspergillus fumigatus , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD8-Positivos/imunologia , Feminino , Humanos , Imunidade Inata/imunologia , Hospedeiro Imunocomprometido/imunologia , Incidência , Imageamento por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Rinite/diagnóstico por imagem , Rinite/imunologia , Rhizopus oryzae , Fatores de Risco , Sinusite/diagnóstico por imagem , Sinusite/imunologia , Tomografia Computadorizada por Raios X , Adulto Jovem
11.
J Nanosci Nanotechnol ; 21(10): 5296-5301, 2021 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-33875121

RESUMO

Herein, we report a facile hydrothermal synthesis of MnO2 nanoparticles anchored multi walled carbon nanotubes (MnO2@MWCNTs) as potential anode materials for lithium-ion (Li-ion) batteries. The prepared MnO2@MWCNTs were characterized by several techniques which confirmed the formation of MnO2 nanoparticles anchored MWCNTs. The X-ray diffraction and Raman-scattering analyses of the prepared material further revealed the effective synthesis of MnO2@MWCNTs. The fabricated Li-ion battery based on MnO2@MWCNTs exhibited a reversible capacity of ~823 mAhg-1 at a current density of 100 mAg-1 for the first cycle, and delivered a capacity of ~421 mAhg-1 for the 60 cycles. The coulombic efficiency was found to be ~100% which showed excellent reversible charge-discharge behavior. The outstanding performance of the MnO2@MWCNTs anode for the Li-ion battery can be attributed to the distinctive morphology of the MnO2 nanoparticles anchored MWCNTs that facilitated the fast transport of lithium ions and electrons and accommodated a broad volume change during the cycles of charge/discharge.

12.
Bioorg Chem ; 111: 104841, 2021 06.
Artigo em Inglês | MEDLINE | ID: mdl-33798851

RESUMO

Novel 5-amino-1,2,4-triazole derivatives and their cyclized 1,2,4-triazolo[1,5-a]pyrimidine analogues were designed, synthesized and evaluated for their antimicrobial activities. They were tested against five bacterial strains (Methicillin Resistant S. aureus (MRSA), E. coli, K. pneumoniae, A. baumannii and P. aeruginosa) using ciprofloxacin as a positive control and against two fungal strains (C. albicans and C. neoformans) using fluconazole and amphotericin B as positive controls. Compounds 9, 13a and 13b showed high to moderate antifungal activities against candida albicans (MIC values = 4-32 µg/ml), with considerable safety profiles; where no cytotoxicity against human embryonic kidney or red blood cells were detected at concentrations up to 32 µg/mL. Furthermore, compound 9 showed significant inhibitory activity against lansterol 14α-demethylase (IC50 = 0.27 µM), compared to the reference drug fluconazole (IC50 = 0.25 µM). Molecular docking of compound 9 into the active site of the cytochrome P450 enzyme revealed comparable binding modes and docking scores to those of fluconazole. Finally, in silico ADME studies prediction and drug-like properties of these compounds revealed favorable oral bioavailability results.


Assuntos
Antibacterianos/farmacologia , Antifúngicos/farmacologia , Bactérias/efeitos dos fármacos , Desenho de Fármacos , Fungos/efeitos dos fármacos , Triazóis/farmacologia , Antibacterianos/síntese química , Antibacterianos/química , Antifúngicos/síntese química , Antifúngicos/química , Relação Dose-Resposta a Droga , Testes de Sensibilidade Microbiana , Estrutura Molecular , Relação Estrutura-Atividade , Triazóis/síntese química , Triazóis/química
13.
Dis Markers ; 2021: 8866093, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33628339

RESUMO

Sarcopenia is the most common feature of hepatic cirrhosis characterized by progressive loss of muscle mass and function and increases permanently the mortality and morbidity rates among those patients. The incidence of sarcopenia in cirrhotic patients ranged 40-70% associating with impaired quality of life and augmented rates of infection. Based on these issues, this review is aimed at determining the prevalence and main causes of sarcopenia among cirrhotic patients and recognizing the recent diagnostic and physical treatment modalities that prevent risk factors for sarcopenia in those patients. No ideal modality is currently demonstrated for diagnosing sarcopenia in hepatic diseases, particularly cirrhosis; however, recent studies reported different diagnostic modalities for muscle function in different individuals including handgrip strength, skeletal muscle index, six-min walk test, liver frailty index, short physical performance battery, and radiological assessments for quadriceps and psoas muscles. Exercise training and therapeutic nutrition are strongly recommended for controlling sarcopenia in cirrhotic patients. The exercise program is designed and carried out on a frequent basis within an extensive scheduled time aimed at improving functional performance, aerobic capacity, and healthy conditions. Finally, a combination of exercise training and therapeutic nutrition is powerfully recommended to control sarcopenia in cirrhosis.


Assuntos
Exercício Físico/fisiologia , Cirrose Hepática/terapia , Fígado/patologia , Músculo Esquelético/patologia , Terapia Nutricional/métodos , Sarcopenia/terapia , Feminino , Força da Mão/fisiologia , Humanos , Cirrose Hepática/complicações , Cirrose Hepática/diagnóstico , Cirrose Hepática/patologia , Testes de Função Hepática , Masculino , Desempenho Físico Funcional , Qualidade de Vida/psicologia , Sarcopenia/complicações , Sarcopenia/diagnóstico , Sarcopenia/patologia , Fatores Sexuais
14.
ACS Omega ; 6(2): 1280-1288, 2021 Jan 19.
Artigo em Inglês | MEDLINE | ID: mdl-33490787

RESUMO

Yttria modified zirconia (YZ) supported on 5 wt % of Ni-based catalysts promoted with ceria (1-3 wt %) were prepared by the impregnation process to investigate their performance for dry reforming of methane. The reforming reactions, conducted at 700 °C and at atmospheric pressure using a CO2/CH4/N2 fixed feed ratio of 3/3/1, with a total flow rate of 70 mL/min, revealed that the ceria-promoted catalysts (xCe-Ni-YZ; x = 1-3 wt %) enhanced the CH4 and CO2 conversions as compared to the reference catalyst (Ni-YZ). A CO2 conversion of 85% was exhibited by the 3Ce-Ni-YZ catalyst. Despite increased conversions, xCe-Ni-YZ catalysts showed more amounts of carbon deposition as evidenced by the values of TGA, and hence were found to be less stable as compared to the reference Ni-YZ catalyst. The used and fresh catalysts were characterized by BET, H2-TPR, XRD, TEM, Raman, TPD, and TGA. TEM images displayed nanoparticle sizes of Ni in the fresh catalysts, while carbon filaments were formed on the spent catalysts. The CO2-TPD, H2-TPR, and BET results revealed the existence of only weak and moderate basic sites, the increase of total hydrogen consumption, and the surface area values with the addition of the Ce promoter, respectively. The TGA analysis showed that the Ce promoter increased the carbon deposition, while the Raman results indicated the dominance of crystallinity due to the graphitized carbon.

15.
Artigo em Inglês | MEDLINE | ID: mdl-33823782

RESUMO

BACKGROUND & OBJECTIVE: Exercise and dietary interventions are used to control dyslipidemia and depression in obese individuals, whilst rare investigations have examined the concurrent effects of a low-fat diet and moderate-intensity aerobic exercise training (MIAET) on dyslipidemia and depression in obese patients. Hence, we assessed the potential influences of a low-fat diet combined with MIAET on blood lipids and depression in those individuals. METHODS: Forty-two obese patients aged 30-50 years have been enrolled in this randomized controlled trial. They have been randomized equally into MIAET group (n=14, 60-70% of the maximum heart rate (Max HR), three sessions a week), a low-fat diet group (n=14, fat, 30% Kcal/day), and a low-fat diet plus MIAET (n=14) for 10 consecutive weeks. Body mass index (BMI), lipid profile, and Hamilton depression rating scale (HDRS) have been assessed on two occasions, pre and post- 10 weeks. RESULTS: It was demonstrated that a low-fat diet group showed an improvement in total cholesterol (T-Ch), p=0.046, with no changes in triglycerides (TGs), p=0.343, low-density lipoproteins (LDLs), p=0.187, and high-density lipoproteins (HDLs), p=0.224; however, MIAET group showed an improvement in TGs, p=0.042, HDLs, p=0.038 with no changes in T-Ch, p=0.126, and LDLs, p=0.368. Regarding the low-fat diet plus MIAET group, significant improvements were identified in TGs, p=0.003, T-Ch, p<0.001, LDLs, p=0.004, and HDLs, p<0.001. For the depression status, all groups showed a significant improvement in HDRS, p<0.001, with a low-fat diet plus MIAET group showing greater advantages, p<0.05. CONCLUSION: The results of the current trial suggest an important implication for promoting improvement in blood lipids and a reduction in depression status in obese patients with dyslipidemia following 10-week of a concurrent low-fat diet and moderate-intensity aerobic exercise more than low-fat diet or MIAET alone.


Assuntos
Dieta com Restrição de Gorduras , Dislipidemias , Adulto , Índice de Massa Corporal , Depressão/etiologia , Depressão/terapia , Dislipidemias/diagnóstico , Dislipidemias/terapia , Exercício Físico , Humanos , Pessoa de Meia-Idade , Obesidade/complicações , Obesidade/terapia
16.
Artigo em Inglês | MEDLINE | ID: mdl-33178306

RESUMO

OBJECTIVES: Chronic nonspecific low back pain (chronic nsLBP) is one of the most common musculoskeletal disorders leading to disabilities and physical inactivity. Laser therapy was used in chronic nsLBP treatment; however, no previous studies have assessed the impacts of high-intensity laser therapy (HILT) versus low-level laser therapy (LLLT) on chronic nsLBP. This study compared the effects of HILT versus LLLT on individuals suffering from chronic nsLBP. METHODS: The study was a randomized control trial. Sixty individuals with chronic nsLBP were enrolled in this study between May and November 2019. All participants were clinically diagnosed with chronic nsLBP. They were assigned randomly into three groups, 20 in each group. The first group received a program of LLLT, the second group received a program of HILT, and the third did not receive laser therapy (control group). Pain severity, disability, lumbar mobility, and quality of life were assessed before and after 12-week intervention. RESULTS: Both LLLT and HILT groups showed a significant improvement of the Oswestry Disability Index (ODI), visual analogue scale (VAS), lumbar range of motion (ROM), and European Quality of Life (EuroQol) scores (p > 0.05), while the control group did not show significant changes (p > 0.05). Comparison among the three study groups postintervention showed significant differences in the outcome measures (p > 0.05), while comparison between the LLLT and HILT groups showed nonsignificant differences (p > 0.05). CONCLUSION: There are no different influences of LLLT versus HILT on chronic nsLBP patients. Both LLLT and HILT reduce pain and disability and improve lumbar mobility and quality of life in chronic nsLBP patients.

17.
Molecules ; 25(21)2020 Oct 29.
Artigo em Inglês | MEDLINE | ID: mdl-33138289

RESUMO

Catalysts of 10% Ni, supported on promoted alumina, were used to accomplish the partial oxidation of methane. The alumina support was doped with oxides of Mo, Mg, Ti and Y. An incipient wetness impregnation technique was used to synthesize the catalysts. The physicochemical properties of the catalysts were described by XRD, H2-TPR (temperature programmed reduction), BET, TGA, CO2-TPD (temperature-programmed desorption) and Raman. The characterization results denoted that Ni has a strong interaction with the support. The TGA investigation of spent catalysts displayed the anticoking enhancement of the promoters. The impact of the support promoters on the catalyst stability, methane conversion and H2 yield was inspected. Stability tests were done for 460 min. The H2 yields were 76 and 60% and the CH4 conversions were 67 and 92%, respectively, over Ni/Al2O3+Mg, when the reaction temperatures were 550 and 650 °C, respectively. The performance of the present work was compared to relevant findings in the literature.


Assuntos
Compostos de Alumínio/química , Manganês/química , Metano/química , Molibdênio/química , Níquel/química , Titânio/química , Ítrio/química , Catálise , Oxirredução
18.
Sci Rep ; 10(1): 13861, 2020 Aug 17.
Artigo em Inglês | MEDLINE | ID: mdl-32807834

RESUMO

The generation of synthesis gas (hydrogen and carbon monoxide mixture) from two global warming gases of carbon dioxide and methane via dry reforming is environmentally crucial and for the chemical industry as well. Herein, magnesium-promoted NiO supported on mesoporous zirconia, 5Ni/xMg-ZrO2 (x = 0, 3, 5, 7 wt%) were prepared by wet impregnation method and then were tested for syngas production via dry reforming of methane. The reaction temperature at 800 °C was found more catalytically active than that at 700 °C due to the endothermic feature of reaction which promotes efficient CH4 catalytic decomposition over Ni and Ni-Zr interface as confirmed by CH4-TSPR experiment. NiO-MgO solid solution interacted with ZrO2 support was found crucial and the reason for high CH4 and CO2 conversions. The highest catalyst stability of the 5Ni/3Mg-ZrO2 catalyst was explained by the ability of CO2 to partially oxidize the carbon deposit over the surface of the catalyst. A mole ratio of hydrogen to carbon monoxide near unity (H2/CO ~ 1) was obtained over 5Ni/ZrO2 and 5Ni/5Mg-ZrO2, implying the important role of basic sites. Our approach opens doors for designing cheap and stable dry reforming catalysts from two potent greenhouse gases which could be of great interest for many industrial applications, including syngas production and other value-added chemicals.

19.
Artigo em Inglês | MEDLINE | ID: mdl-32351591

RESUMO

OBJECTIVE: Limited studies have assessed the effect of moderate-intensity continuous aerobic exercise on hepatic fat content and visceral lipids in hepatic patients with diabesity. This study was designed to evaluate hepatic fat content and visceral lipids following moderate-intensity continuous aerobic exercise in hepatic patients with diabesity. DESIGN: A single-blinded randomised controlled trial. METHODS: Thirty-one diabetic obese patients with nonalcoholic fatty liver disease were recruited into this study. The patients were randomly classified into exercise and control groups, fifteen patients in the exercise group and sixteen patients in the control group. The exercise group received an 8-week moderate-intensity continuous aerobic exercise program with standard medical treatment, while the control group received standard medical treatment without any exercise program. Hepatic fat content and visceral lipids were assessed before and after intervention at the end of the study. RESULTS: Baseline and clinical characteristics showed a nonsignificant difference between the two groups (p > 0.05). At the end of the intervention, the aerobic exercise showed significant improvements (serum triglycerides and low-density lipoproteins (LDLs), p ≤ 0.002, total cholesterol, p=0.004, visceral fats, p=0.016, glycated hemoglobin (HbA1C), p=0.022, high-density lipoproteins (HDLs), p=0.038, alanine transaminases (AL), p=0.044, intrahepatic triglyceride and HOMA-IR, p=0.046, and body mass index (BMI), p=0.047), while the control group showed a nonsignificant difference (p > 0.05). The postintervention analysis showed significant differences in favor of the aerobic exercise group (p < 0.05). CONCLUSIONS: Moderate-intensity continuous aerobic exercise reduces the hepatic fat content and visceral lipids in hepatic patients with diabesity. Recommendations should be prescribed for encouraging moderate-intensity aerobic exercise training, particularly hepatic patients with diabesity.

20.
Medicine (Baltimore) ; 99(10): e19471, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-32150108

RESUMO

BACKGROUND: Some studies assessed the effect of aerobic exercise on diabetic obese patients with hepatic disease, while very limited studies compared high-intensity interval (HII) versus moderate-intensity continuous (MIC) on diabetic obese patients with non-alcoholic fatty liver disease (NAFLD). OBJECTIVES: This study was designed to assess the effects of HII versus MIC on intrahepatic triglycerides (IHTG) and visceral lipids in diabetic obese patients with NAFLD. DESIGN: Randomized controlled trial. METHODS: Forty-seven diabetic obese individuals with NAFLD were enrolled in this study. The individuals were randomly divided into 16 in HII group, 15 in MIC group, and 16 in the controls. HII group received HII exercise, MIC group received 8-week MIC exercise while the control group did not receive any exercise intervention. IHTG and visceral lipids were assessed pre- and post-intervention. RESULTS: Baseline and clinical characteristics showed nonsignificant difference among the 3 groups (P > .05). Both HII and MIC groups showed a significant reduction in hepatic fat and visceral lipids (P < .05), while the controls showed nonsignificant difference (P > .05) after completing the study intervention. Postintervention analysis showed nonsignificant changes between the HII and MIC groups (P > .05). CONCLUSIONS: Exercise training wither HII or MIC aerobic exercise reduces IHGT and visceral lipids in diabetic obese patients with NAFLD. No differences were observed between the effects of both exercise programs on diabetic obese patients with NAFLD.


Assuntos
Diabetes Mellitus Tipo 2 , Treinamento Intervalado de Alta Intensidade , Lipídeos/sangue , Hepatopatia Gordurosa não Alcoólica , Obesidade/terapia , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Obesidade/sangue , Resultado do Tratamento
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