155,906 results match your criteria particles size


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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Sorption of sulfadiazine and flow modeling in an alluvial deposit of a dry riverbed in the Brazilian semiarid.

J Contam Hydrol 2021 May 4;241:103818. Epub 2021 May 4.

Department of Nuclear Energy, Federal University of Pernambuco, Recife, Brazil.

The Brazilian semiarid region is subjected to irregular rainfall, prolonged droughts, and high temperatures, hampering the surface water accumulation. The water access is restricted to the alluvium in the valleys, which are used for cattle and poultry livestock development. These activities trigger the excessive use of veterinary antibiotics. Read More

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Per- and poly-fluoroalkyl substance remediation from soil and sorbents: A review of adsorption behaviour and ultrasonic treatment.

Chemosphere 2021 May 28;282:131025. Epub 2021 May 28.

University of Surrey, Department of Chemical and Process Engineering, Surrey, England, GU2 7XH, UK. Electronic address:

Per- and poly-fluoroalkyl substances (PFAS) are xenobiotics, present at variable concentrations in soils and groundwater worldwide. Some of the current remediation techniques being researched or applied for PFAS-impacted soils involve solidification-stabilisation, soil washing, excavation and disposal to landfill, on site or in situ smouldering, thermal desorption, ball milling and incineration. Given the large volumes of soil requiring treatment, there is a need for a more environmentally friendly technique to remove and treat PFASs from soils. Read More

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Small dense low-density lipoprotein: analytical review.

Clin Chim Acta 2021 Jun 9. Epub 2021 Jun 9.

Department of Clinical Biochemistry, Queen Elizabeth University Hospital, NHS Greater Glasgow and Clyde, Glasgow, Scotland, United Kingdom. Electronic address:

Background: The causal relationship between low-density lipoprotein (LDL) and atherosclerotic cardiovascular disease (CVD) has been firmly substantiated. LDL consists of a heterogeneous group of particles with different physicochemical and metabolic properties. Among them, small dense LDL (sdLDL) particles are considered an emerging CVD risk factor and a promising CVD risk biomarker. Read More

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Effect of emulsifiers on the discoloration of chlorophyll and their potential for use in green beverages.

J Food Sci 2021 Jun 12. Epub 2021 Jun 12.

Department of Chemistry and Applied Chemistry, Graduate School of Science and Engineering, Saga University, Honjo-machi, Saga, Japan.

The discoloration of chlorophyll (Chl) by light is an ongoing issue for green beverages in the food industry. To suppress the discoloration of Chl in aqueous solution, the effects of different emulsifiers were investigated on the discoloration of Chl under ultraviolet (UV) irradiation to determine their potential application for use as food additives. Sucrose fatty acid ester (SE), sorbitan fatty acid ester (TW), and quillaja saponin (QS) were used as emulsifiers, while Triton X-100 (TX) was used for reference. Read More

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Innovative topical niosomal gel formulation containing diclofenac sodium (niofenac).

J Drug Target 2021 Jun 11:1-38. Epub 2021 Jun 11.

Pharmaceutics Research Laboratory, School of Life Sciences, University of Sussex, Brighton, BN1 9QJ, UK.

The purpose of this research was to enhance the transdermal delivery of diclofenac sodium niosomal formulations. To characterise the obtained niosomes, SEM, XRPD, DSC and ATR-FTIR were employed. . Read More

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Numerical study of acoustophoretic manipulation of particles in microfluidic channels.

Proc Inst Mech Eng H 2021 Jun 11:9544119211024775. Epub 2021 Jun 11.

State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, P.R. China.

The microfluidic technology based on surface acoustic waves (SAW) has been developing rapidly, as it can precisely manipulate fluid flow and particle motion at microscales. We hereby present a numerical study of the transient motion of suspended particles in a microchannel. In conventional studies, only the microchannel's bottom surface generates SAW and only the final positions of the particles are analyzed. Read More

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Construction of carboxymethyl konjac glucomannan/chitosan complex nanogels as potential delivery vehicles for curcumin.

Food Chem 2021 May 28;362:130242. Epub 2021 May 28.

College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China. Electronic address:

Construction of nanoscale delivery systems from natural food biopolymer complexes have attracted increasing interests in the fields of food industries. In this study, novel carboxymethyl konjac glucomannan/ chitosan (CMKGM/CS) nanogels with and without 1-ethyl-3-(3-dimethylaminopropyl) /N-hydroxysuccinimide) (EDC/NHS)-initiated crosslinking were prepared. The physicochemical and structural properties of the CMKGM/CS nanogels and their potential to be a delivery vehicle for curcumin were investigated. Read More

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Starch-fatty acid complexes improve the gel properties and enhance the fatty acid content of Nemipterus virgatus surimi under high-temperature treatment.

Food Chem 2021 May 30;362:130253. Epub 2021 May 30.

College of Food Science and Technology, Bohai University, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning 121013, China.

The effect of high amylose corn starch (HAS)-fatty acid complexes on the gel properties, protein secondary structure, microstructure, fatty acid content, and sensory properties of surimi under high-temperature treatment were investigated. The formation of HAS-fatty acid complexes increased melting temperature and decreased average particle size of HAS. The addition of HAS-fatty acid complexes significantly improved the breaking force, deformation and whiteness of surimi gels. Read More

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Nano-activated carbon derived from date palm coir waste for efficient sequestration of noxious 2,4-dichlorophenoxyacetic acid herbicide.

Chemosphere 2021 Jun 5;282:131103. Epub 2021 Jun 5.

Department of Chemical Engineering, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates. Electronic address:

Alarming water contamination rates by toxic herbicides have drawn attention to treat these pollutants using efficient, easy, and economic techniques. In this work, date-palm coir (DPC) waste-based nano-activated carbon (DPC-AC) was successfully prepared and examined for adsorptive removal of toxic 2,4-dichlorophenoxyacetic acid (2,4-DPA) herbicide from synthetic wastewater. The DPC-AC was synthesized via a single-step carbonization-KOH activation approach. Read More

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A complete mass balance for plastics in a wastewater treatment plant - Macroplastics contributes more than microplastics.

Water Res 2021 May 28;201:117307. Epub 2021 May 28.

Department of the Built Environment, Aalborg University, 9220 Aalborg Øst, Denmark.

A complete plastic particle mass balance was established at Sweden's second-largest wastewater treatment plant. It comprised material collected at its two bar screens, a 20 mm and a 2 mm one, in the influent water after the 20 mm screen, the effluent water, and the digested sludge. Macro- and microplastics above 500 µm were analysed individually applying ATR-FTIR, while microplastics of 10-500 µm were analysed by µFTIR imaging with automated particle recognition. Read More

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Nanopriming with phytosynthesized zinc oxide nanoparticles for promoting germination and starch metabolism in rice seeds.

J Biotechnol 2021 Jun 8. Epub 2021 Jun 8.

Department of Biotechnology, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, 211004, India. Electronic address:

The application of zinc oxide nanoparticles (ZnO NPs) in agricultural field is emerging and relatively new. In this work, a simple, cost-efficient, non-toxic and eco-friendly method for the green synthesis of ZnO NPs by Cassia occidentalis leaf extract has been described. Techniques used to characterize nanoparticles (NPs) were X-ray diffractometer (XRD), UV visible spectroscopy, Particle size analyzer (PSA), Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). Read More

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Cassava starch-processing residue utilization for packaging development.

Int J Biol Macromol 2021 Jun 8. Epub 2021 Jun 8.

Laboratory of Packaging Technology and Membrane Development, LATEM, Department of Chemical Engineering, Universidade Federal do Rio Grande do Sul (UFRGS), Street Ramiro Barcellos, 2777 Anexo I, ZC: 90035-007 Porto Alegre, RS, Brazil.

The starch-based film development has been extensively studied since, in general, it is possible to obtain transparent, non-toxic, odorless, good gas barrier, biodegradable, and tasteless samples. However, world hunger-related problems are a reality and the use of starches, a recognized carbohydrate source, in the packaging industry should be avoided. Thus, the use of different residual starchy can minimize the costs of production, promoting the development of innovative biomaterials, eliminating the competition with the food chain. Read More

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Quantifying the Digestion of Cross-Linked Hyaluronic Acid Fillers With Hyaluronidase.

Authors:
Shoaib Ugradar

Dermatol Surg 2021 Jun 9. Epub 2021 Jun 9.

Oculoplastic Surgery, The Jules Stein Eye Institute, University of California, Los Angeles.

Background: Adverse events due to hyaluronic acid fillers (HAFs) may be treated with hyaluronidase, an enzyme that cleaves bonds within hyaluronic acid. This study reviews the efficacy of currently available hyaluronidase preparations in breaking down commercial, cross-linked HAFs.

Methods: Three HAFs were used in this study (Restylane, Juvederm Voluma, and Belotero [BEL] Balance). Read More

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Oil palm empty fruit bunch valorization for activated and non-activated carbon nanoparticles and its heavy-metal-removal efficiency.

Water Sci Technol 2021 Jun;83(11):2652-2668

Southeast Asia Regional Center for Tropical Biology (SEAMEO BIOTROP), Southeast Asia Minister of Education Organization, Bogor, West Java, Indonesia and Indonesian Green Action Forum (IGAF), Jepara, Central Java, Indonesia E-mail:

In this study, we examined activated and non-activated carbon nanoparticles (CNPs) derived from oil palm empty fruit bunch (OPEFB) fibers for their nanomaterial characteristics and their potential effectiveness in heavy metal removal. To investigate these properties, transmission electron microscopy, scanning electron microscopy (SEM), EDX, Fourier transform infrared spectroscopy, particle size analysis, X-ray diffraction, and atomic absorption spectrophotometry were employed. This study shows that both the activated and the non-activated CNPs were in the form of well-dispersed and aggregated particles. Read More

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Shaping the Color and Angular Appearance of Plasmonic Metasurfaces with Tailored Disorder.

ACS Nano 2021 Jun 11. Epub 2021 Jun 11.

4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.

The optical properties of plasmonic nanoparticle ensembles are determined not only by the particle shape and size but also by the nanoantenna arrangement. To investigate the influence of the spatial ordering on the far-field optical properties of nanoparticle ensembles, we introduce a disorder model that encompasses both "frozen-phonon" and correlated disorder. We present experimental as well as computational approaches to gain a better understanding of the impact of disorder. Read More

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An unprecedented pyridine-based dinuclear mixed-valent Re oxo-bridged complex: a solvatochromic and AIE-active probe for nanomolar detection of picric acid and trinitrotoluene.

Dalton Trans 2021 Jun 11. Epub 2021 Jun 11.

Department of Chemistry, BITS-Pilani Hyderabad Campus, Hyderabad-500078, India.

This paper describes the synthesis of an unprecedented oxo-bridged rheniumI/VII (Re) complex by treating Re2(CO)10 with a pyridyl-linked anthracene-based twisted π-conjugated ligand. The molecular structures of both the ligand and the complex are determined by analyzing IR, NMR, and HR-MS spectra and unequivocally determined using single-crystal X-ray diffraction studies. Unlike previous observations, the complexation occurs uniquely to yield an unprecedented oxo-bridged ReI/VII complex. Read More

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Effect of the physicochemical properties of zinc oxide sources on their bioavailability in broilers.

Br Poult Sci 2021 Jun 11. Epub 2021 Jun 11.

UMR BOA, INRAE, Université de Tours, F-37380, Nouzilly, France.

The bioavailability of a trace mineral source is related to its intestinal solubility (bioaccessibility), which in turn is determined by its physicochemical properties. It is still not clear which characteristics are more relevant in affecting solubility and bioavailability of mineral sources. Zinc oxide (ZnO) is a common feed additive used to supplement zinc in the diet of monogastric animals. Read More

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Mitigating the Sign Problem through Basis Rotations.

Phys Rev Lett 2021 May;126(21):216401

Institute for Condensed Matter Theory and IQUIST and Department of Physics, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, USA.

Quantum Monte Carlo simulations of quantum many-body systems are plagued by the Fermion sign problem. The computational complexity of simulating Fermions scales exponentially in the projection time β and system size. The sign problem is basis dependent and an improved basis, for fixed errors, leads to exponentially quicker simulations. Read More

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Engineering of stealth (maghemite/PLGA)/chitosan (core/shell)/shell nanocomposites with potential applications for combined MRI and hyperthermia against cancer.

J Mater Chem B 2021 Jun 11. Epub 2021 Jun 11.

Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Granada, Granada, Spain. and Institute of Biopathology and Regenerative Medicine (IBIMER), Center of Biomedical Research (CIBM), University of Granada, Granada, Spain and Biosanitary Research Institute of Granada (ibs.GRANADA), Andalusian Health Service (SAS), University of Granada, Granada, Spain.

(Maghemite/poly(d,l-lactide-co-glycolide))/chitosan (core/shell)/shell nanoparticles have been prepared reproducibly by nanoprecipitation solvent evaporation plus coacervation (production performance ≈ 45%, average size ≈ 325 nm). Transmission electron microscopy, energy dispersive X-ray spectroscopy, electrophoretic determinations, and X-ray diffraction patterns demonstrated the satisfactory embedment of iron oxide nanocores within the solid polymer matrix and the formation of an external shell of chitosan in the nanostructure. The adequate magnetic responsiveness of the nanocomposites was characterized in vitro by hysteresis cycle determinations and by visualization of the nanosystem under the influence of a 0. Read More

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Engineering Quick- and Long-acting Naloxone Delivery Systems for Treating Opioid Overdose.

Pharm Res 2021 Jun 10. Epub 2021 Jun 10.

Purdue University, Weldon School of Biomedical Engineering, West Lafayette, Indiana, 47907, USA.

Purpose: Opioids have been the main factor for drug overdose deaths in the United States. Current naloxone delivery systems are effective in mitigating the opioid effects only for hours. Naloxone-loaded poly(lactide-co-glycolide) (PLGA) microparticles were prepared as quick- and long-acting naloxone delivery systems to extend the naloxone effect as an opioid antidote. Read More

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Spray-Congealing and Wet-Sieving as Alternative Processes for Engineering of Inhalation Carrier Particles: Comparison of Surface Properties, Blending and In Vitro Performance.

Pharm Res 2021 Jun 10. Epub 2021 Jun 10.

Research Center Pharmaceutical Engineering GmbH, Inffeldgasse 13, 8010, Graz, Austria.

Purpose: Traditionally, α-lactose monohydrate is the carrier of choice in dry powder inhaler (DPI) formulations. Nonetheless, other sugars, such as D-mannitol, have emerged as potential alternatives. Herein, we explored different particle engineering processes to produce D-mannitol carriers for inhaled delivery. Read More

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Effect of the incorporation of hydroxyapatite on the diametral tensile strength of conventional and hybrid glass ionomer cements.

Odontology 2021 Jun 10. Epub 2021 Jun 10.

Department of Dental Materials, School of Dentistry, Universidad de La República, Montevideo, Uruguay.

The objective was to evaluate the effect of the incorporation of calcium hydroxyapatite particles (HAp) in the diametral tensile strength of a conventional type II glass ionomer (GC Gold Label 2) and a resin-modified glass ionomer cement (GC Gold Label 2 LC R). Two experimental HAp (E1HAp or E2HAp) were synthesized and characterized using X-ray diffraction and Confocal Raman spectroscopy. Both HAp were added into the powder of a conventional or resin-modified glass ionomer cement at 5 or 10 wt. Read More

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Scaling relation between genome length and particle size of viruses provides insights into viral life history.

iScience 2021 May 21;24(5):102452. Epub 2021 Apr 21.

Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

In terms of genome and particle sizes, viruses exhibit great diversity. With the discovery of several nucleocytoplasmic large DNA viruses (NCLDVs) and jumbo phages, the relationship between particle and genome sizes has emerged as an important criterion for understanding virus evolution. We use allometric scaling of capsid volume with the genome length of different groups of viruses to shed light on its relationship with virus life history. Read More

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Climatic and tectonic significance of Taboche Lake, Khumbu Region, Nepal.

iScience 2021 May 28;24(5):102418. Epub 2021 Apr 28.

Climate Change Institute, University of Maine, Orono, ME, USA.

The Everest region is characterized by its alpine glacial environment. In an effort to understand environmental change and tectonic activity, our team cored Taboche Lake, situated at 4,712 m along the western margin of the Ngozumpa Glacier. This research catalogs past earthquakes using geological records of the lake core that are important for the assessment of future earthquake hazards in the region and provides information for tectonic risk of glacial lake floods. Read More

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In-tube solid phase microextraction coupled to miniaturized liquid chromatography for both, noble metal nanoparticle assessment and sensitive plasmonic assay development.

Anal Chim Acta 2021 Aug 21;1171:338665. Epub 2021 May 21.

MINTOTA Research Group, Departament de Química Analítica, Facultat de Química, Universitat de Valencia, 46100, Burjassot, Spain. Electronic address:

Colorimetric localized surface plasmon resonance (LSPR) as analytical response is applied for a wide number of chemical sensors and biosensors. However, the dependence of different factors, such as size distribution of nanoparticles (NPs), shape, dielectric environment, inter-particle distance and matrix, among others, can provide non-reliable results by UV-vis spectrometry in complex matrices if NP assessment is not carried out, particularly at low levels of analyte concentrations. Miniaturized liquid chromatography, capillary (CapLC) and nano (NanoLC), coupled on line with in-tube solid phase microextraction (IT-SPME) is proposed for the first time for both, controlling suitability of used noble metal NP dispersions and developing plasmonic assays. Read More

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Influence of protein and solid fat content on mechanical properties and comminution behavior of structured plant-based lipids.

Food Res Int 2021 Jul 19;145:110416. Epub 2021 May 19.

Department of Food Physics and Meat Science, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstr. 25, 70599 Stuttgart, Germany. Electronic address:

Recently an approach has been developed to structure plant-based lipids with the intention to mimic animal fat tissue in processed meat products or analogues. This study investigated the comminution behavior in a bowl chopper of such structured lipids with varying mechanical properties. For products like salami-type sausages these systems need to withstand comminution to yield particles for inclusion in product matrices. Read More

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Co-encapsulation of L-ascorbic acid and quercetin by gelatin/sodium carboxymethyl cellulose coacervates using different interlayer oils.

Food Res Int 2021 Jul 12;145:110411. Epub 2021 May 12.

Department of Food Science, Rutgers University, New Brunswick, NJ 08901, USA. Electronic address:

A two-step emulsification prior to complex coacervation was employed to develop a co-encapsulation technology of hydrophilic and hydrophobic components for nutrition enhancement. Processing parameters of mononuclear ellipse-like microcapsules using gelatin and sodium carboxymethyl cellulose as wall materials were evaluated. The particle size and morphology of microcapsules and the encapsulation efficiency of L-ascorbic acid were significantly affected by the water-oil phase ratio and total biopolymer concentration. Read More

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Physicochemical properties, digestibility and anti-osteoporosis effect of yak bone powder with different particle sizes.

Food Res Int 2021 Jul 11;145:110401. Epub 2021 May 11.

Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193, China. Electronic address:

As a kind of promising resource, animal bone has been widely processed into functional foods. However, there is little research about the effect of particle size on the physicochemical properties and digestibility of yak bone powder (YBP), as well as its anti-osteoporosis activity. In this study, the YBP with median particle sizes (MPS) ranging from 19. Read More

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A novel extraction protocol of nano-polystyrene from biological samples.

Sci Total Environ 2021 May 28;790:148085. Epub 2021 May 28.

Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen 361102, China. Electronic address:

Toxicological data demonstrate that nanoplastics (NPs) can cause direct adverse health effects. However, a method for quantifying NPs in biological samples is lacking to date. In this study, a diatomite associated coagulation-sedimentation extraction (CSE) protocol was developed to selectively enrich polystyrene nanoplastics (PS-NP) from microplastics (PS-MP) in the digest of animal tissues, which were then analyzed using pyrolysis gas chromatography-mass spectrometry. Read More

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