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PubMed Journals Articles About "Particle Sciences" RSS

23:50 EDT 18th October 2017 | BioPortfolio

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

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We have published hundreds of Particle Sciences news stories on BioPortfolio along with dozens of Particle Sciences Clinical Trials and PubMed Articles about Particle Sciences for you to read. In addition to the medical data, news and clinical trials, BioPortfolio also has a large collection of Particle Sciences Companies in our database. You can also find out about relevant Particle Sciences Drugs and Medications on this site too.

Showing "Particle Sciences" PubMed Articles 1–25 of 4,800+

Particle sizing of pharmaceutical aerosols via direct imaging of particle settling velocities.

We present a novel method for characterizing in near real-time the aerodynamic particle size distributions from pharmaceutical inhalers. The proposed method is based on direct imaging of airborne particles followed by a particle-by-particle measurement of settling velocities using image analysis and particle tracking algorithms. Due to the simplicity of the principle of operation, this method has the potential of circumventing potential biases of current real-time particle analyzers (e.g. Time of Flight ana...


The delivery of siRNA to hepatic stellate cells using a lipid nano particle composed of a vitamin A-scaffold lipid-like material.

Simultaneous observation of particle and wave behaviors of entangled photons.

We theoretically study wave-particle duality of two entangled photons in the spirit of quantum version of delayed-choice experiments using Hadamard gate controlled by the quantum state of an ancilla and show that the two photons may globally exhibit particle-like, wave-like or simultaneously both particle-like and wave-like behavior. We prove that the obtained results cannot be satisfactorily explained by any hidden-variable theory. We also propose an efficient and experimentally feasible scheme without usi...


Electrokinetic motion of a spherical micro particle at an oil-water interface in microchannel.

The electrokinetic motion of a negatively charged spherical particle at an oil-water interface in a microchannel is numerically investigated and analyzed in this paper. A three-dimensional (3D) transient numerical model is developed to simulate the particle electrokinetic motion. The channel wall, the surface of the particle and the oil-water interface are all considered negatively charged. The effects of the direct current (DC) electric field, the zeta potentials of the particle-water interface and the oil...

Effect of grinding on the solid state stability and particle dissolution of acyclovir polymorphs.

The present work investigated the solid state change of four acyclovir polymorphs when ground at room temperature (Method A) and under cryo-grinding in the presence of liquid nitrogen (Method B). Modifications in particle size and shape (evaluated by scanning electron microscopy) and in the water content (evaluated by thermal analysis) were related to transitions at the solid state, as confirmed by X-ray powder diffractometry. Anhydrous Form I was stable under grinding by both methods A and B. The anhydrous...

Therapeutic Radiometals Beyond (177)Lu and (90)Y: Production and Application of Promising α-Particle, β(-)-Particle, and Auger Electron Emitters.

In recent years, new α-particle-, β(-)-particle-, and Auger electron-emitting radiometals-such as (67)Cu, (47)Sc, (166)Ho, (161)Tb, (149)Tb, (212)Pb/(212)Bi, (225)Ac, and (213)Bi-have been produced and evaluated (pre)clinically for therapeutic purposes. In this short review article, the most important routes of production of these radiometals are critically discussed, as are examples of their application in preclinical and clinical studies.

Medical Sciences Table of Contents.

Biological Sciences Table of Contents.

Strong deformation of the thick electric double layer around a charged particle during sedimentation or electrophoresis.

The deformation of the electric double layer around a charged colloidal particle during sedimentation or electrophoresis in a binary, symmetric electrolyte is studied. The surface potential of the particle is assumed to be small compared to the thermal voltage scale. Additionally, the Debye length is assumed to be large compared to the particle size. These assumptions enable a linearization of the electrokinetic equations. The particle appears as a point charge in this thick-double-layer limit; the distribu...

The hydrophobic force for bubble-particle attachment in flotation - a brief review.

A deep understanding of the bubble-particle attachment is critical to flotation science and engineering. Historically, the so called "hydrophobic force" has been widely accepted to be the reason for bubble-particle attachment although its origin is still under debate now. In this paper, a number of representative mechanisms for the origin of hydrophobic attractions are reviewed, with the main focus being on solid-solid systems. Then we highlight the recent advances in the hydrophobic force measurement betwe...

The Effect of the Pore Entrance on Particle Motion in Slit Pores: Implications for Ultrathin Membranes.

Membrane rejection models generally neglect the effect of the pore entrance on intrapore particle transport. However, entrance effects are expected to be particularly important with ultrathin membranes, where membrane thickness is typically comparable to pore size. In this work, a 2D model was developed to simulate particle motion for spherical particles moving at small Re and infinite Pe from the reservoir outside the pore into a slit pore. Using a finite element method, particles were tracked as they acce...

Particle segmentation algorithm for flexible single particle reconstruction.

As single particle cryo-electron microscopy has evolved to a new era of atomic resolution, sample heterogeneity still imposes a major limit to the resolution of many macromolecular complexes, especially those with continuous conformational flexibility. Here, we describe a particle segmentation algorithm towards solving structures of molecules composed of several parts that are relatively flexible with each other. In this algorithm, the different parts of a target molecule are segmented from raw images accor...

Interfacial-entropy-driven thermophoretic tweezers.

Directed migration of particles and molecules in a temperature gradient field, which is known as thermophoresis or the Soret effect, is of fundamental importance for mass transfer in colloid science and life sciences. However, thermophoretic tweezers that enable versatile particle manipulation have remained elusive due to the complex underlying physical forces in thermophoresis and the lack of general thermophilic particles above room temperature. Herein, we exploit entropic response and permittivity gradie...

Measurements of the neutral particle spectra on Mars by MSL/RAD from 2015-11-15 to 2016-01-15.

The Radiation Assessment Detector (RAD), onboard the Mars Science Laboratory (MSL) rover Curiosity, has been measuring the energetic charged and neutral particles and the radiation dose rate on the surface of Mars since the landing of the rover in August 2012. In contrast to charged particles, neutral particles (neutrons and γ-rays) are measured indirectly: the energy deposition spectra produced by neutral particles are complex convolutions of the incident particle spectra with the detector response functi...

The impact of homogeniser speed, dispersing aggregate size and centrifugation on particle size analyses of pork as a measure of myofibrillar fragmentation.

Particle size analysis has been proposed as a measure of myofibrillar fragmentation resulting from post-mortem proteolysis in meat. The aim of this study was to examine the effect of homogenisation speed, dispersing aggregate size and centrifugation on particle size characteristics of pork loin. Particle size characteristics were significantly (P≤0.023) greater for samples aged 2 than 8d for all but the 80 and 90% quantiles. Differentiation with ageing was only achieved when homogenised at 11,000rpm using...

Effect of dynamic bias on accuracy of radioactive particle tracking (RPT) technique at different data acquisition frequencies.

The accuracy of radioactive particle tracking technique depends on the ability to locate the exact position of a tracer particle. In the current work, experiments are performed to find the accuracy of an RPT measurement in terms of locating the position of the tracer particle and its velocity measurement. Results are presented for different tracer velocities at different data acquisition frequencies to minimize the error generated due to dynamic bias. Finally an optimal frequency is recommended for differen...

Parameter Selection and Performance Comparison of Particle Swarm Optimization in Sensor Networks Localization.

Localization is a key technology in wireless sensor networks. Faced with the challenges of the sensors' memory, computational constraints, and limited energy, particle swarm optimization has been widely applied in the localization of wireless sensor networks, demonstrating better performance than other optimization methods. In particle swarm optimization-based localization algorithms, the variants and parameters should be chosen elaborately to achieve the best performance. However, there is a lack of guidan...

Formation and Destabilization of the Particle Band on the Fluid-Fluid Interface.

An inclusion of particles in a Newtonian liquid can fundamentally change the interfacial dynamics and even cause interfacial instabilities. For instance, viscous fingering can arise even in the absence of the destabilizing viscosity ratio between invading and defending phases, when particles are added to the viscous invading fluid inside a Hele-Shaw cell. In the same flow configuration, the formation and breakup of a dense particle band are observed on the interface, only when the particle diameter d become...

An Optical-Fiber-Based Airborne Particle Sensor.

A new optical-fiber-based airborne particle counter is reported. Unlike traditional light-scatter-based techniques, the particle is detected through the drop in optical fiber coupling efficiency as the particle disrupts the electromagnetic mode of the optical beam. The system is simple, substantially smaller than traditional systems, and does not require high power laser input. This makes it attractive for wearable air quality monitors where size is a premium. There is close agreement between theoretical mo...

Wake-Mediated Propulsion of an Upstream Particle in Two-Dimensional Plasma Crystals.

The wake-mediated propulsion of an "extra" particle in a channel of two neighboring rows of a two-dimensional plasma crystal, observed experimentally by Du et al. [Phys. Rev. E 89, 021101(R) (2014)PRESCM1539-375510.1103/PhysRevE.89.021101], is explained in simulations and theory. We use the simple model of a pointlike ion wake charge to reproduce this intriguing effect in simulations, allowing for a detailed investigation and a deeper understanding of the underlying dynamics. We show that the nonreciprocit...

The load-bearing ability of a particle raft under the transverse compression of a slender rod.

Liquid marbles and particle rafts are liquid interfaces covered with tiny particles, which are accompanied with many exotic behaviors. This study seeks to extend our understanding on the load-bearing ability of a particle raft under the transverse compression of a slender rod. At first, the interface morphologies of the particle raft and water are captured and compared with each other. Then the load-distance curves of the particle raft and water surface are measured using a self-developed device. For the pa...

Modeling shear-induced particle ordering and deformation in a dense soft particle suspension.

We apply the lattice Boltzmann method and the bead-spring network model of deformable particles (DPs) to study shear-induced particle ordering and deformation and the corresponding rheological behavior for dense DP suspensions confined in a narrow gap under steady external shear. The particle configuration is characterized with small-angle scattering intensity, the real-space 2D local order parameter, and the particle shape factors including deformation, stretching and tilt angles. We investigate how partic...

Bulk-mediated surface transport in the presence of bias.

Surface transport, when the particle is allowed to leave the surface, travel in the bulk for some time, and then return to the surface, is referred to as bulk-mediated surface transport. Recently, we proposed a formalism that significantly simplifies analysis of bulk-mediated surface diffusion [A. M. Berezhkovskii, L. Dagdug, and S. M. Bezrukov, J. Chem. Phys. 143, 084103 (2015)]. Here this formalism is extended to bulk-mediated surface transport in the presence of bias, i.e., when the particle has arbitrar...

Small Particle Driven Chain Disentanglements in Polymer Nanocomposites.

Using neutron spin-echo spectroscopy, x-ray photon correlation spectroscopy, and bulk rheology, we studied the effect of particle size on the single-chain dynamics, particle mobility, and bulk viscosity in athermal polyethylene oxide-gold nanoparticle composites. The results reveal a ≈25% increase in the reptation tube diameter with the addition of nanoparticles smaller than the entanglement mesh size (≈5  nm), at a volume fraction of 20%. The tube diameter remains unchanged in the composite with la...

Explaining the spatiotemporal variation of fine particle number concentrations over Beijing and surrounding areas in an air quality model with aerosol microphysics.

In this study, a three-dimensional air quality model with detailed aerosol microphysics (NAQPMS + APM) was applied to simulate the fine particle number size distribution and to explain the spatiotemporal variation of fine particle number concentrations in different size ranges over Beijing and surrounding areas in the haze season (Jan 15 to Feb 13 in 2006). Comparison between observations and the simulation indicates that the model is able to reproduce the main features of the particle number size distrib...


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