PubMed Journals Articles About "Opening Review Particle Size Reference Standards" RSS

20:52 EDT 20th September 2018 | BioPortfolio

Opening Review Particle Size Reference Standards PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Opening Review Particle Size Reference Standards articles that have been published worldwide.

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Showing "opening review particle size reference standards" PubMed Articles 1–25 of 27,000+

Performance Comparison of Field Portable Instruments to the Scanning Mobility Particle Sizer Using Monodispersed and Polydispersed Sodium Chloride Aerosols.

This study compared the performance of the following field portable aerosol instrument sets to performance of the reference Scanning Mobility Particle Sizer (SMPS): the handheld CPC-3007, the portable aerosol mobility spectrometer (PAMS), the NanoScan scanning mobility particle sizer (NanoScan SMPS) combined with an optical particle sizer (OPS). Tests were conducted with monodispersed and polydispersed aerosols. Monodispersed aerosols were controlled at the approximate concentration of 1 × 105 particles cm...

Particle size dependence of the physicochemical properties of biochar.

The inadequate definition of different particle sizes of biochar impedes the establishment of guidelines concerning the selection of suitable particle sizes. In this study, various properties of a series of ten biochar samples of varying particle size (5-5000 μm) from the same origin have been investigated and compared. Cluster analysis and principal component analysis based on all of the parameters were executed to evaluate the dissimilarity of different particle sizes of biochar, and to classify the si...

Implementation of Size-Dependent Local Diagnostic Reference Levels for CT Angiography.

Diagnostic reference levels (DRLs) are established for standard-sized patients; however, patient dose in CT depends on patient size. The purpose of this study was to introduce a method for setting size-dependent local diagnostic reference levels (LDRLs) and to evaluate these LDRLs in comparison with size-independent LDRLs and with respect to image quality.

Floatable superhydrophobic AgO photocatalyst without a modifier and its controllable wettability by particle size adjustment.

In this research, a controlling mechanism of particle size on the wettability of Ag2O particles is reported, and an interesting floatable Ag2O photocatalyst with superhydrophobicity and superoleophilicity is prepared based on this mechanism. Stable superhydrophobic and superhydrophilic Ag2O without a low-surface-energy modifier can be obtained only by adjusting its particle size, and its wettability can switch mutually by changing the particle size. The wettability of Ag2O converts from superhydrophilic to ...

The influence of energy input on the particle size of disintegrated excess sludge in the ultrasonic disintegration process.

The objective of this research was to examine the influence of energy input on the particle size distribution of disintegrated sludge. The change of particle size distribution indicates the deagglomeration of flocs and disruption of micro-colonies. As the digestibility of sludge increases with dispersion, particle size analysis is an important factor in evaluating the disintegration process. Four different levels of energy input were used in the research: 10-100 kWh·m. All samples showed significant change...

Investigation of the particle size-dependent near-infrared spectral features of binary mixture samples in conjunction with Monte Carlo simulation and the influence of particle size on the accuracy of quantitative analysis.

Near-infrared (NIR) spectral features of a target component can be influenced by its particle size as well as the particle sizes of the surrounding components in multi-component samples; therefore, understanding the essence of particle size-induced spectral variation is fundamental for robust quantitative analysis. For systematic investigation, two different types of binary-component samples were prepared. First, in ambroxol/lactose powders, only the particle size of lactose (surrounding filler) was varied,...

Determining chewing efficiency using a solid test food and considering all phases of mastication.

Following chewing a solid food, the median particle size, X, is determined after N chewing cycles, by curve-fitting of the particle size distribution. Reduction of X with N is traditionally followed from N ≥ 15-20 cycles when using the artificial test food Optosil, because of initially unreliable values of X. The aims of the study were (i) to enable testing at small N-values by using initial particles of appropriate size, shape and amount, and (ii) to compare measures of chewing ability, i.e. chewing ...

Evaluation of a flow cytometry method to determine size and real refractive index distributions in natural marine particle populations.

A flow cytometric (FC) method was developed to retrieve particle size distributions (PSDs) and real refractive index (n) information in natural waters. Geometry and signal response of the sensors within the flow cytometer (CytoSense, CytoBuoy b.v., Netherlands) were characterized to form a scattering inversion model based on Mie theory. The procedure produced a mesh of diameter and nisolines where each particle is assigned the diameter and nvalues of the closest node, producing PSDs and particle real refrac...

Peak Ventilation Reference Standards from Exercise Testing: From the FRIEND Registry.

Cardiopulmonary exercise testing (CPX) provides valuable clinical information, including peak ventilation (VEpeak), which has been shown to have diagnostic and prognostic value in the assessment of patients with underlying pulmonary disease. This report provides reference standards for VEpeak derived from CPX on treadmills in apparently healthy individuals.

Practical guidelines for the characterization and quality control of pure drug nanoparticles and nano-cocrystals in the pharmaceutical industry.

The number of poorly soluble drug candidates is increasing, and this is also seen in the research interest towards drug nanoparticles and (nano-)cocrystals; improved solubility is the most important application of these nanosystems. In order to confirm the functionality of these nanoparticles throughout their lifecycle, repeatability of the formulation processes, functional performance of the formed systems in pre-determined way and system stability, a thorough physicochemical understanding with the aid of ...

Digital health app development standards: a systematic review protocol.

There is currently a lack of clear and accepted standards for the development (planning, requirement analysis and research, design and application testing) of apps for medical and healthcare use which poses different risks to developers, providers, patients and the public. The aim of this work is to provide an overview of the current standards, frameworks, best practices and guidelines for the development of digital health apps. This review is a critical 'stepping stone' for further work on producing approp...

Monitoring cobalt-oxide single particle electrochemistry with sub-diffraction accuracy.

By partially overcoming the diffraction limit, super-localization techniques have extended the applicability of optical techniques down to the nanometer size-range. Herein, cobalt oxide-based nanoparticles are electrochemically grown onto carbon nanoelectrodes and their individual catalytic properties are evaluated through a combined electrochemical-optical approach. Using dark-field white light illumination, edges super-localization techniques are applied to quantify changes in particle size during elec-tr...

Design of polymer particle dispersions (latexes) in the course of radical heterophase polymerization for biomedical applications.

Dispersions of polymer particle (DPPs) are increasingly being exploited both as biomolecule carriers, and as markers in various DPP biomedical applications related to cell and molecular biology, enzymology, immunology, diagnostics, in vitro and in vivo visualization, bioseparation, etc. Their potential to reduce reaction scales, lower costs, improve the rate, sensitivity, selectivity, stability and reproducibility of assays governs the diversity of their bioapplications. This review focuses on the design of...

Is it appropriate to use WHO Multicentre Growth Reference Study standards to assess the growth parameters of Sri Lankan babies? A single-centre cross-sectional study.

To compare the anthropometric measurements of newborns in a tertiary care hospital in Sri Lanka, with WHO standards.

Particle-Size-Exclusion Clogging Regimes in Porous Media.

From observations of the progressive deposition of noncolloidal particles by geometrical exclusion effects inside a 3D model porous medium, we get a complete dynamic view of particle deposits over a full range of regimes from transport over a long distance to clogging and caking. We show that clogging essentially occurs in the form of an accumulation of elements in pore size clusters, which ultimately constitute regions avoided by the flow. The clusters are dispersed in the medium, and their concentration (...

Effective Method for Obtaining the Hydrosols of Detonation Nanodiamond with Particle Size < 4 nm.

Detonation nanodiamond is a commercially available synthetic diamond that is obtained from the carbon of explosives. It is known that the average particle size of detonation nanodiamond is 4⁻6 nm. However, it is possible to separate smaller particles. Here we suggest a new approach for the effective separation of detonation nanodiamond particles by centrifugation of a "hydrosol/glycerol" system. The method allows for the production of the detonation nanodiamond hydrosol with a very sharp distribution in s...

Heavy metals in the finest size fractions of road-deposited sediments.

The concentration of heavy metals in urban road-deposited sediments (RDS) can be used as an indicator for environmental pollution. Thus, their occurrence has been studied in whole road dust samples as well as in size fractions obtained by sieving. Because of the limitations of size separation by sieving little information is available about heavy metal concentrations in the road dust size fractions  Cu ≈ Zn > Cr > Cd ≈ Pb ≈ Mn > Ni > Co ≈ V. For all heavy metals the...

Particle-scale understanding of cypermethrin in sediment: Desorption, bioavailability, and bioaccumulation in benthic invertebrate Lumbriculus variegatus.

Influence of sediment particle size on the desorption, bioavailability, and bioaccumulation potential of cypermethrin was investigated in the present study using two biomimetic techniques (Tenax extraction and solid-phase microextraction (SPME)) and bioaccumulation testing with Lumbriculus variegatus. A field-collected sediment was wet sieved to obtain five particle-size fractions (500 μm) and used for cypermethrin spiking. The finest sediment (

The Value of U.S. Pharmacopeial Standards: A Review of the Literature.

While there are many standard-setting health care organizations, the United States Pharmacopeia's (USP) role includes the creation of documentary and physical standards for therapeutics, including chemical drugs, excipients and biologics. Despite the ubiquity of these standards, little work has been done to characterize and quantify their value. We reviewed the peer-reviewed and grey literature relevant to such evaluations. The review yielded 36 articles, focused variously on accreditation and other standar...

Airborne ultrafine particles in a naturally ventilated metro station: Dominant sources and mixing state determined by particle size distribution and volatility measurements.

Ultrafine particle number concentrations and size distributions were measured on the platform of a metro station in Athens, Greece, and compared with those recorded at an urban background station. The volatility of the sampled particles was measured in parallel, providing further insights on the mixing state and composition of the sampled particles. Particle concentration exhibited a mean value of 1.2 × 10 # cm and showed a weak correlation with train passage frequency, but exhibited a strong correlati...

Are normative sonographic values of kidney size in children valid and reliable? A systematic review of the methodological quality of ultrasound studies using the Anatomical Quality Assessment (AQUA) tool.

A plethora of research is available on ultrasonographic kidney size standards. We performed a systematic review of methodological quality of ultrasound studies aimed at developing normative renal parameters in healthy children, by evaluating the risk of bias (ROB) using the 'Anatomical Quality Assessment (AQUA)' tool.

Corrigendum to "Gas/particle partitioning and particle size distribution of PCDD/Fs and PCBs in urban ambient air" Sci. Total Environ. 624 (2018) 170-179.

Biodistribution of colloidal gold nanoparticles after intravenous injection: Effects of PEGylation at the same particle size.

Recently, polyethylene glycol (PEG) modified gold nanoparticles have been studied to maintaining long-term stability in biological fluids. Its biodistribution was also reported, however, comparison of bare gold nanoparticles and PEGylated gold nanoparticles with equal particle size is not sufficient.

ICP-MS based methods to characterize nanoparticles of TiOand ZnO in sunscreens with focus on regulatory and safety issues.

This study sought to develop analytical methods to characterize titanium dioxide (TiO) and zinc oxide (ZnO) nanoparticles (NPs), including the particle size distribution and concentration, in cream and spray sunscreens with different sun protection factor (SPF). The Single Particle Inductively Coupled Plasma-Mass Spectrometry (SP ICP-MS) was used as screening and fast method to determine particles size and number. The Asymmetric Flow-Field Flow Fractionation (AF4-FFF) as a pre-separation technique was on-li...

Long-term trends in submicron particle concentrations in a metropolitan area of the northeastern United States.

Significant changes in emission sources have occurred in the northeastern United States over the past decade, due in part to the implementation of emissions standards, the introduction and addition of abatement technologies for road transport, changes in fuel sulfur content for road and non-road transport, as well as economic impacts of a major recession and differential fuel prices. These changes in emission scenarios likely affected the concentrations of airborne submicron particles. This study investigat...

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