826,640 results match your criteria solution

Modelling the precipitation of nanoparticles in a closed medium in the presence of seeds: Application to amorphous silica synthesis.

J Colloid Interface Sci 2021 Apr 6;601:843-852. Epub 2021 Apr 6.

Université de Strasbourg/EOST, CNRS, Institut Terre et Environnement Strasbourg, 5 rue René Descartes, Strasbourg Cedex F-67084, France.

Seed-mediated methods are widely used in industrial or academic laboratories for the synthesis of nanoparticles of controlled shape and size. In the natural medium, precipitation of secondary minerals also often take place on seeds. In this context, we have devised a formalism which accounts for the competition between seed growth and nucleation and growth of secondary particles in an initially over-saturated aqueous solution. Read More

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Paper-based mediatorless enzymatic microfluidic biofuel cells.

Biosens Bioelectron 2021 Jun 9;190:113391. Epub 2021 Jun 9.

Dept. of Mechanical Engineering, BK21 FOUR ERICA-ACE Center, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do, 15588, South Korea. Electronic address:

In this study, eco-friendly and disposable paper-based membraneless microfluidic enzymatic fuel cells (EFCs) were developed without any mediators to reduce the toxicity and cost of EFCs. Glucose oxidase and laccase were immobilized on multi-walled carbon nanotube electrodes to catalyze the redox reaction of glucose and oxygen. Micromachining techniques well-suited for mass production were used to precisely fabricate micro-scale Y-shaped and cross-shaped EFCs. Read More

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New perspective towards therapeutic regimen against SARS-CoV-2 infection.

J Infect Public Health 2021 May 26;14(7):852-862. Epub 2021 May 26.

Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 2193, South Africa; Infection Control, Charlotte Maxeke Johannesburg Academic Hospital, National Health Laboratory Service, Johannesburg, 2193, South Africa. Electronic address:

The ongoing enormous loss of human life owing to Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2), has led to a global crisis ranging from the collapse of health - care systems to socio-economic instability. As SARS-CoV-2 is a novel virus, very little information is available from researchers and therefore, a rigorous effort is required to decode its pathogenicity. There are no licenced treatment options available for treating SARS-CoV-2 infections and the development of a new antiviral drug targeting coronavirus cannot happen soon. Read More

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Generation of hydroxyl radicals by metal-free bifunctional electrocatalysts for enhanced organics removal.

Sci Total Environ 2021 May 31;791:148107. Epub 2021 May 31.

Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 511443, China. Electronic address:

Low yields of HO and a narrow range of appropriate pH values have been two major drawbacks for electro-Fenton (EF) process. Herein, metal-free electrochemical advanced oxidation processes (EAOPs) were developed with nitrogen and sulfur co-doped electrochemically exfoliated graphene (N, S-EEGr) electrocatalysts, which was confirmed as an outstanding bifunctional catalyst for synchronous generation and activation of HO via (2 + 1) e consecutive reduction reactions. Specifically, two elements (N, S) in metal-free N, S-EEGr-CF cathode synergize to promote the formation of HO followed by its activation. Read More

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Effect of ZnO nanoparticles on Zn, Cu, and Pb dissolution in a green bioretention system for urban stormwater remediation.

Chemosphere 2021 May 29;282:131045. Epub 2021 May 29.

Naturalea, Terra Alta, 51, 08211, Castellar del Vallès, Barcelona, Spain.

Stormwater runoff from urban and suburban areas can carry hazardous pollutants directly into aquatic ecosystems. These pollutants, such as metals, nutrients, aromatic hydrocarbons, pesticides, and pharmaceuticals, are very toxic to aquatic organisms. Recently, significant amounts of zinc oxide engineered nanoparticles (ZnO-NPs) have been detected in urban stormwater and its bioretention systems. Read More

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Biostimulation of sulfate-reducing bacteria used for treatment of hydrometallurgical waste by secondary metabolites of urea decomposition by Ochrobactrum sp. POC9: From genome to microbiome analysis.

Chemosphere 2021 May 31;282:131064. Epub 2021 May 31.

Institute of Microbiology, Faculty of Biology, University of Warsaw, Ilji Miecznikowa 1, 02-096, Warsaw, Poland. Electronic address:

Sulfate-reducing bacteria (SRB) are key players in many passive and active systems dedicated to the treatment of hydrometallurgical leachates. One of the main factors reducing the efficiency and activity of SRB is the low pH and poor nutrients in leachates. We propose an innovative solution utilizing biogenic ammonia (B-NH), produced by urea degrading bacteria, as a pretreatment agent for increasing the pH of the leachate and spontaneously stimulating SRB activity via bacterial secondary metabolites. Read More

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Performance evaluation of nanotubular halloysites from weathered pegmatites in removing heavy metals from water through novel artificial intelligence-based models and human-based optimization algorithm.

Chemosphere 2021 Jun 3;282:131012. Epub 2021 Jun 3.

Department of Exploration Geology, Faculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, 18 Vien st., Duc Thang ward, Bac Tu Liem dist., Hanoi, Viet Nam.

The efforts of this study aimed to evaluate the feasibility of the nanotubular halloysites in weathered pegmatites (NaHWP) for removing heavy metals (i.e., Cd, Pb) from water. Read More

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Speciation, controlling steps and pathways of silver release from the sludge generated from coagulation of wastewater spiked with silver nanoparticles.

Chemosphere 2021 Jun 4;282:131093. Epub 2021 Jun 4.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China.

Sludge generated in wastewater treatment facilities is an integral part for the introduction of silver nanoparticles (AgNPs) to the terrestrial environment, which would cause some adverse ecosystem responses. The understanding of silver release process from the sludge is important to evaluate their risks. In this study, the amount and speciation of the released silver were investigated by taking the sludge generated by wastewater coagulation with AgNPs added (denoted as sludge) an example, and kinetic analysis and density functional theory (DFT) calculations were first used to explore the controlling steps and pathways about the silver release. Read More

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Decoration of Citrus limon wood carbon with FeO to enhanced Cd removal: A reclaimable and magnetic nanocomposite.

Chemosphere 2021 Jun 4;282:131088. Epub 2021 Jun 4.

Department of Environmental Health Engineering, Faculty of Health and Nutrition, Bushehr University of Medical Sciences, Bushehr, Iran. Electronic address:

In the present study, the activated carbon of lemon (ACL) was generated from Citrus limon wood waste and composited with FeO nanoparticles. The ACL/FeO magnetic composite was effectively used to eliminate Cd from an aqueous solution. The active surface area values for ACL and ACL/FeO magnetic composite were 25. Read More

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Hierarchical ZIF-decorated nanoflower-covered 3-dimensional foam for enhanced catalytic reduction of nitrogen-containing contaminants.

J Colloid Interface Sci 2021 May 20;602:95-104. Epub 2021 May 20.

Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan. Electronic address:

Metal Organic Frameworks (MOFs) represent a promising class of metallic catalysts for reduction of nitrogen-containing contaminants (NCCs), such as 4-nitrophenol (4-NP). Nevertheless, most researches involving MOFs for 4-NP reduction employ noble metals in the form of fine powders, making these powdered noble metal-based MOFs impractical and inconvenient for realistic applications. Thus, it would be critical to develop non-noble-metal MOFs which can be incorporated into macroscale and porous supports for convenient applications. Read More

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Synthesis of a 2D copper(II)-carboxylate framework having ultrafast adsorption of organic dyes.

J Colloid Interface Sci 2021 May 31;602:43-54. Epub 2021 May 31.

Department of Chemistry, GC University Lahore, 54000, Pakistan. Electronic address:

Two-dimensional (2D) coordination polymers are very interesting materials for their attractive applications. A novel 2D metal-organic framework (MOF) was derived from copper(II) and amino benzoic acid under both room temperature and solvothermal reaction conditions using different solvents. From both of the synthesis methods, an identical MOF was crystalized with monoclinic crystal system having P2/c space group. Read More

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I did not expect to be dreaming: Explaining realization in lucid dreams with a Bayesian framework.

Piotr Szymanek

Conscious Cogn 2021 Jun 9;93:103163. Epub 2021 Jun 9.

Faculty of Philosophy, Jagiellonian University, Gołębia 24, 31-007 Kraków, Poland. Electronic address:

The commonsense view is that a lucid dream starts when the dreamer realizes that they are currently dreaming. The notion of realization, however, has been accepted at face value, with little consideration of whether the dreamer realizes that they are dreaming in the sense of actual reasoning, or if it is a mere epiphenomenon of lucid dream initiation. This article offers a solution to this problem by, first, arguing that the transition to lucidity can occur as a result of successful reasoning, and second, building a model of this reasoning in terms of probabilistic reasoning. Read More

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Accelerometry-derived respiratory index estimating apnea-hypopnea index for sleep apnea screening.

Comput Methods Programs Biomed 2021 May 31;207:106209. Epub 2021 May 31.

Grenoble Alpes University, CNRS, CHU Grenoble Alpes, Grenoble INP, TIMC, Grenoble, France. Electronic address:

Background And Objective: Sleep Apnea Syndrome (SAS) is a multimorbid chronic disease with individual and societal deleterious consequences. Polysomnography (PSG) is the multi-parametric reference diagnostic tool that allows a manual quantification of the apnea-hypopnea index (AHI) to assess SAS severity. The burden of SAS is affecting nearly one billion people worldwide explaining that SAS remains largely under-diagnosed and undertreated. Read More

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The Mass Transfer Index (MTI): A semi-empirical approach for quantifying transport of solutes in variably saturated porous media.

J Contam Hydrol 2021 May 29;242:103842. Epub 2021 May 29.

Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401, United States of America. Electronic address:

The processes impacting solute transport through unsaturated porous media have been receiving renewed attention due to their relevance to the transport of emerging contaminants. A set of well-monitored and highly controlled experiments in sand columns were conducted to determine the effect of partial saturation on conservative solute breakthrough in porous media. The results suggest traditional transport parameter estimation methods inadequately account for the pore-scale processes of mass transfer to the immobile zones and the effects of partial saturation on advective transport, even for conservative tracers. Read More

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Large-scale evaluation of the Positive and Negative Syndrome Scale (PANSS) symptom architecture in schizophrenia.

Asian J Psychiatr 2021 Jun 3;62:102732. Epub 2021 Jun 3.

Research Division, Institute of Mental Health, Singapore; Stanley Center for Psychiatric Research, The Broad Institute of MIT and Harvard, Cambridge, MA, United States; Feinstein Institute of Medical Research, The Zucker Hillside Hospital, New York, United States. Electronic address:

Although the Positive and Negative Syndrome Scale (PANSS) is widely utilized in schizophrenia research, variability in specific item loading exist, hindering reproducibility and generalizability of findings across schizophrenia samples. We aim to establish a common PANSS factor structure from a large multi-ethnic sample and validate it against a meta-analysis of existing PANSS models. Schizophrenia participants (N = 3511) included in the current study were part of the Singapore Translational and Clinical Research Program (STCRP) and the Clinical Antipsychotic Trials for Intervention Effectiveness (CATIE). Read More

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Fabrication of a gradient hydrophobic surface with parallel ridges on pyrolytic carbon for artificial heart valves.

Colloids Surf B Biointerfaces 2021 Jun 2;205:111894. Epub 2021 Jun 2.

Jiangxi Key Laboratory of Nanobiomaterials, Institute of Advanced Materials, East China Jiaotong University, Nanchang 330013, China; School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China. Electronic address:

Effective surface modification to endow pyrolytic carbon (PYC) with long-term anti-thrombotic performance is highly demanded. In this work, a gradient hydrophobic surface on PYC was prepared by creating parallel ridges via the combination of laser etching technology and surface fluorosilanization. Scanning electron microscopy (SEM) observation confirms that the gradient hydrophobic surface is composed of a bare PYC region and four regions of parallel ridges with varying distances. Read More

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AIE-based fluorescent boronate probe and its application in peroxynitrite imaging.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Jun 4;261:120044. Epub 2021 Jun 4.

Institute of Environmental Science, Shanxi University, Taiyuan 030006, PR China. Electronic address:

Fluorescent probes have contributed greatly to our understanding of the biological role of peroxynitrite (ONOO). The ONOO fluorescence probe characterized by the arlyboronate received a moderate opening fluorescence response, and the borate-masked probe significantly increased the sensitivity of ONOO. Thus, two simple fluorescent probes (ADB and ANB) with the recognition receptor of phenyl boronate moiety were constructed for the detection of ONOO. Read More

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Recent advances in technologies for removal and recovery of selenium from (waste)water: A systematic review.

J Environ Manage 2021 Jun 9;294:112926. Epub 2021 Jun 9.

Faculty of Bioscience Engineering, Coupure Links 653, 9000, Gent, Belgium. Electronic address:

Selenium (Se) is distributed into different environmental compartments by natural and anthropogenic activities, and generally discharged in the form of selenate [SeO] and selenite [SeO], which are both toxic. Physical-chemical and biological treatment processes have been reported to exhibit good treatment efficiencies for Se from aqueous streams, only a few demonstrated to achieve effluent concentrations <5 μg/L. Moreover, there are only a few numbers of studies that describe the progress in technological developments over the last decade. Read More

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Biofortification quality in bananas monitored by energy-dispersive X-ray fluorescence and chemometrics.

Food Chem 2021 Jun 2;362:130172. Epub 2021 Jun 2.

São Paulo State University (UNESP), Institute of Chemistry, Group of Alternative Analytical Approaches (GAAA), Bioenergy Research Institute (IPBEN), Av. Prof. Francisco Degni, 55 - Jardim Quitandinha, Araraquara, São Paulo CEP: 14.800-060, Brazil; National Institute of Alternative Technologies for Detection Toxicological Assessment and Removal of Micropollutants and Radioactive Substances (INCT-DATREM), São Paulo State University (UNESP), Institute of Chemistry, Av. Prof. Francisco Degni, 55 - Jardim Quitandinha, Araraquara, São Paulo, CEP: 14.800-060, Brazil. Electronic address:

Biofortification is a nutritional strategy used to enhance nutrients in a variety of staple foods. As bananas and plantains (Musa spp.) are considered staple food in many developing countries, monitoring zinc (Zn) content in biofortified bananas is crucial to ensure this mineral intake. Read More

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Glycoproteogenomics: Setting the Course for Next Generation Cancer Neoantigens Discovery for Cancer Vaccines.

Genomics Proteomics Bioinformatics 2021 Jun 9. Epub 2021 Jun 9.

Experimental Pathology and Therapeutics Group, Portuguese Institute of Oncology, Porto 4200-072, Portugal; Institute of Biomedical Sciences Abel Salazar, University of Porto, Porto 4050-313, Portugal; Porto Comprehensive Cancer Center (P.ccc), Porto 4200-072, Portugal.

Molecular-assisted precision oncology gained tremendous ground with high throughput next-generation sequencing (NGS), supported by robust bioinformatics. The quest for genomics-based cancer medicine set the foundations for improved patient stratification, while unveiling a wide array of neoantigens for immunotherapy. Upfront pre-clinical and clinical studies have successfully used tumor-specific peptides in vaccines with minimal off-target effects. Read More

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Consistent Alterations of Human Fecal Microbes after Transplantation into Germ-free Mice.

Genomics Proteomics Bioinformatics 2021 Jun 9. Epub 2021 Jun 9.

MOE Key Laboratory of Molecular Biophysics, Hubei Key Laboratory of Bioinformatics and Molecular-imaging, Department of Bioinformatics and Systems Biology, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China; College of Life Science, Henan Normal University, Xinxiang 453007, China. Electronic address:

Fecal microbiota transplantation (FMT) of human fecal samples into germ-free (GF) mice is useful for establishing causal relationships between the gut microbiota and human phenotypes. However, due to the intrinsic differences between human and mouse intestines and the different diets of the two organisms, it may not be possible to replicate human phenotypes in mice through FMT; similarly, treatments that are effective in mouse models may not be effective in humans. In this study, we aimed to identify human gut microbes that undergo significant and consistent changes (i. Read More

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Establishing a quantitative index of meropenem hydrolysis for the detection of KPC- and NDM-producing bacteria by MALDI-TOF MS.

J Microbiol Methods 2021 Jun 9:106268. Epub 2021 Jun 9.

Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Laboratório de Pesquisa em Resistência Bacteriana (LABRESIS), Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil. Electronic address:

Background: Matrix Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS), commonly used for microorganism identification, can also be applied for the detection of carbapenemase-producing bacteria by the evaluation of carbapenem hydrolysis. Since KPC- and NDM-producing bacteria are related to high mortality rates, diagnostic assays for its detection are essential. The aim of this study was to develop and evaluate a method to establish a quantitative measure (hydrolysis index - HI) to detect meropenem hydrolysis by MLADI-TOF MS. Read More

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Analysis of permeability and biological properties of dentin treated with experimental bioactive glasses.

J Dent 2021 Jun 9:103719. Epub 2021 Jun 9.

Professor, São Paulo State University (UNESP), School of Dentistry, Araçatuba, Department of Dental Materials and Prosthodontics, 1193 José Bonifácio St., 16015-050 Araçatuba, São Paulo, Brazil. Electronic address:

Objectives: To evaluate obliterating capability and biological performance of desensitizing agents.

Methods: 50 dentin blocks were distributed according to the desensitizing agent used (n=10): Control (Artificial saliva); Ultra EZ (Ultradent); Desensibilize Nano P (FGM); T5-OH Bioactive Glass (Experimental solution); F18 Bioactive Glass (Experimental solution). Desensitizing treatments were performed for 15 days. Read More

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In situ evaluation of 200 ppm fluoride toothpaste content trimetaphosphate, xylitol and erythritol on enamel demineralization and dental biofilm.

J Dent 2021 Jun 9:103724. Epub 2021 Jun 9.

São Paulo State University (UNESP), School of Dentistry, Araçatuba, Department of Preventive and Restorative Dentistry Rua José Bonifácio 1193 Araçatuba, SP, Zip code 16015-050, Brazil. Electronic address:

Objective: To evaluate the effect of low-fluoride (F) toothpaste and sodium trimetaphosphate (TMP) associated with xylitol and erythritol (XE) on enamel demineralization and biofilm composition.

Methods: This crossover double-blind in situ study consisted of five phases (seven days each) and 14 volunteers who wore oral appliances containing four enamel bovine blocks. The cariogenic challenge was performed by 30% sucrose solution (6x/day). Read More

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Sildenafil in endotoxin-induced pulmonary hypertension: an experimental study.

Braz J Anesthesiol 2021 Jun 9. Epub 2021 Jun 9.

Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Cirurgia, São Paulo, SP, Brazil.

Background: Sepsis and septic shock still represent great challenges in critical care medicine. Sildenafil has been largely used in the treatment of pulmonary arterial hypertension, but its effects in sepsis are unknown. The aim of this study was to investigate the hypothesis that sildenafil can attenuate endotoxin-induced pulmonary hypertension in a porcine model of endotoxemia. Read More

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Metal salt-modified biochars derived from agro-waste for effective congo red dye removal.

Environ Res 2021 Jun 9:111492. Epub 2021 Jun 9.

Department of Materials Science and Engineering, Korea University, 145, Anam-ro Seongbuk-gu, Seoul, 02841, Republic of Korea. Electronic address:

Anionic Congo red dye (CR) is not effectively removed by conventional adsorbents. Three novel biochars derived from agro-waste (Acacia auriculiformis), modified with metal salts of FeCl, AlCl, and CaCl at 500 °C pyrolysis have been developed to enhance CR treatment. These biochars revealed significant differences in effluents compared to BC, which satisfied initial research expectations (P < 0. Read More

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Modeling the viral load dependence of residence times of virus-laden droplets from COVID-19-infected subjects in indoor environments.

Indoor Air 2021 Jun 12. Epub 2021 Jun 12.

Department of Chemical Engineering, Indian Institute of Technology Bombay, Mumbai, India.

In the ongoing COVID-19 pandemic situation, exposure assessment and control strategies for aerosol transmission path are feebly understood. A recent study pointed out that Poissonian fluctuations in viral loading of airborne droplets significantly modifies the size spectrum of the virus-laden droplets (termed as "virusol") (Anand and Mayya, 2020). Herein we develop the theory of residence time of the virusols, as contrasted with complete droplet system in indoor air using a comprehensive "Falling-to-Mixing-Plate-out" model that considers all the important processes namely, indoor dispersion of the emitted puff, droplet evaporation, gravitational settling, and plate out mechanisms at indoor surfaces. Read More

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Intrinsically Disordered Osteopontin Fragment Orders During Interfacial Calcium Oxalate Mineralization.

Angew Chem Int Ed Engl 2021 Jun 12. Epub 2021 Jun 12.

Max Planck Institute for Polymer Research: Max-Planck-Institut fur Polymerforschung, molecular spectroscopy, GERMANY.

Calcium oxalate (CaC 2 O 4 ) is the major component of kidney stone, a prevalent chronic human disease worldwide. The acidic osteopontin (OPN) protein in human urine can effectively inhibit the growth of CaC 2 O 4 crystals, thereby acting as a potent stone preventer. Previous studies in bulk solution all attest to the importance of binding and recognition of OPN at the CaC 2 O 4 mineral surface, yet molecular level insights into the active interface during CaC 2 O 4 mineralization are still lacking. Read More

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Pathological findings in horses with lumbosacral region pain.

Equine Vet J 2021 Jun 12. Epub 2021 Jun 12.

Centre for Equine Studies, Animal Health Trust, Lanwades Park, Newmarket, Suffolk, CB8 7UU, UK.

Background: There is a lack of understanding of the pathological and/or physiological nature of lumbosacral region pain.

Objectives: To describe the gross variations of the osseous and soft tissues of the lumbosacral region and report the histological findings of sections of nerve tissue in affected and control horses.

Study Design: Descriptive post-mortem case series. Read More

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Cardiac surgeons' concerns, perceptions, and responses during the COVID-19 pandemic.

J Card Surg 2021 Jun 12. Epub 2021 Jun 12.

Division of Cardiothoracic Surgery, UC Davis Medical Center, Sacramento, California, USA.

Background: The coronavirus disease 2019 (COVID-19) pandemic has had an unprecedented impact on health care and cardiac surgery. We report cardiac surgeons' concerns, perceptions, and responses during the COVID-19 pandemic.

Methods: A detailed survey was sent to recruit participating adult cardiac surgery centers in North America. Read More

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