Dynamics of a suspension of interacting yolk-shell particles

In this work we study the self-diffusion properties of a liquid of hollow spherical particles (shells)bearing a smaller solid sphere in their interior (yolks). We model this system using purely repulsive hard-body interactions between all (shell and yolk) particles, but assume the presence of a background ideal solvent such that all the particles execute free Brownian motion between collisions,characterized by short-time self-diffusion coefficients D0s for the shells and D0y for the yolks. Using a softened version of these interparticle potentials we perform Brownian dynamics simulations to determine the mean squared displacement and intermediate scattering function of the yolk-shell complex. These results can be understood in terms of a set of effective Langevin equations for the N interacting shell particles, pre-averaged over the yolks' degrees of freedom, from which an approximate self-consistent description of the simulated self-diffusion properties can be derived. Here we compare the theoretical and simulated results between them, and with the results for the same system in the absence of yolks. We find that the yolks, which have no effect on the shell-shell static structure, influence the dynamic properties in a predictable manner, fully captured by the theory.Comment: 5 pages, 1 figur

Submillimetre dust polarisation and opacity in the HD163296 protoplanetary ring system

We present ALMA images of the sub-mm continuum polarisation and spectral index of the protoplanetary ringed disk HD163296. The polarisation fraction at 870{\mu}m is measured to be ~0.9% in the central core and generally increases with radius along the disk major axis. It peaks in the gaps between the dust rings, and the largest value (~4%) is found between rings 1 and 2. The polarisation vectors are aligned with the disk minor axis in the central core, but become more azimuthal in the gaps, twisting by up to +/-9degrees in the gap between rings 1 and 2. These general characteristics are consistent with a model of self-scattered radiation in the ringed structure, without requiring an additional dust alignment mechanism. The 870/1300{\mu}m dust spectral index exhibits minima in the centre and the inner rings, suggesting these regions have high optical depths. However, further refinement of the dust or the disk model at higher resolution is needed to reproduce simultaneously the observed degree of polarisation and the low spectral index.Comment: 5 pages +2 pages supplemental data. v2 - revised figures and final values; conclusions unchange

In vitro effects of arylimidamides against Besnoitia besnoiti infection in Vero cells

The in vitro effects of 4 arylimidamides (DB811, DB786, DB750 and DB766) against the proliferative tachyzoite stage of the apicomplexan parasite Besnoitia besnoiti were investigated. These four compounds had been shown earlier to exhibit in vitro activities in the nanomolar range against the related apicomplexans Neospora caninum and Toxoplasma gondii. Real-time-PCR was used to assess B. besnoiti intracellular proliferation in vitro. Preliminary assessment by light microscopy identified DB811 and DB750 as the most promising compounds, while DB786 and DB766 were much less effective. Three-day-growth assays and quantitative real-time PCR was used for IC50 determination of DB811 (0·079 μM) and DB750 (0·56 μM). Complete growth inhibition was observed at 1·6 μM for DB 811 and 1·7 μM for DB750. However, when infected cultures were treated for 14 days, proliferation of parasites occurred again in cultures treated with DB750 from day 4 onwards, while the proliferation of DB811-treated tachyzoites remained inhibited. Electron microscopy of B. besnoiti-infected fibroblast cultures fixed and processed at different time-points following the initiation of drug treatments revealed that DB811 exerted a much higher degree of ultrastructural alterations compared to DB750. These results show that arylimidamides such as DB811 could potentially become an important addition to the anti-parasitic arsenal for food animal production, especially in cattl

Kinematics of a globular cluster with an extended profile: NGC5694

We present a study of the kinematics of the remote globular cluster NGC5694 based on GIRAFFE@VLT medium resolution spectra. A sample of 165 individual stars selected to lie on the Red Giant Branch in the cluster Color Magnitude Diagram was considered. Using radial velocity and metallicity from Calcium triplet, we were able to select 83 bona-fide cluster members. The addition of six previously known members leads to a total sample of 89 cluster giants with typical uncertainties <1.0 km/s in their radial velocity estimates. The sample covers a wide range of projected distances from the cluster center, from ~0.2 arcmin to 6.5 arcmin = 23 half-light radii (r_h). We find only very weak rotation, as typical of metal-poor globular clusters. The velocity dispersion gently declines from a central value of sigma=6.1 km/s to sigma = 2.5 km/s at ~2 arcmin = 7.1= r_h, then it remainins flat out to the next (and last) measured point of the dispersion profile, at ~4 arcmin = 14.0 r_h, at odds with the predictions of isotropic King models. We show that both isotropic single-mass non-collisional models and multi-mass anisotropic models can reproduce the observed surface brightness and velocity dispersion profiles.Comment: Accepted for publication by MNRAS. Pdflatex, 10 pages, 10 figure

ALMA Science Verification Data: Millimeter Continuum Polarimetry of the Bright Radio Quasar 3C 286

We present full-polarization observations of the compact, steep-spectrum radio quasar 3C~286 made with the ALMA at 1.3~mm. These are the first full-polarization ALMA observations, which were obtained in the framework of Science Verification. A bright core and a south-west component are detected in the total intensity image, similar to previous centimeter images. Polarized emission is also detected toward both components. The fractional polarization of the core is about 17\%, this is higher than the fractional polarization at centimeter wavelengths, suggesting that the magnetic field is even more ordered in the millimeter radio core than it is further downstream in the jet. The observed polarization position angle (or EVPA) in the core is $\sim$\,$39^{\circ}$, which confirms the trend that the EVPA slowly increases from centimeter to millimeter wavelengths. With the aid of multi-frequency VLBI observations, we argue that this EVPA change is associated with the frequency-dependent core position. We also report a serendipitous detection of a sub-mJy source in the field of view, which is likely to be a submillimeter galaxy.Comment: 10 pages, 9 figures, Accepted for publication in the Ap

Asociación entre Trastornos Óseos Degenerativos y Acumulación de Líquido en los Recesos de la Articulación Temporomandibular

ResumenEl Objetivo del presente estudio fue determinar la asociación entre presencia de líquido intra-articular y alteraciones degenerativas en las ATM de pacientes adultos con diagnóstico clínico de Trastornos Temporomandibulares, por medio de diagnóstico imagenológico, antes de iniciar su tratamiento.Material y MétodoSe reclutaron 135 pacientes consecutivos (promedio de edad = 33,3 años) que clínicamente presentan disfunciones de las ATM y que fueron examinados por medio de Resonancia Magnética (RM) y Tomografía Computada (TC). Los criterios de exclusión fueron: pacientes menores de 16 años, pacientes mayores de 65 años, pacientes portadores de prótesis dentarias removibles, con enfermedades sistémicas como gota, Osteoartrosis sistémica, hiperlaxitud ligamentaria, malformaciones anatómicas, enfermedades quísticas, tumorales, historia de trauma o cirugía de las ATM. Todos los pacientes fueron examinados utilizando el resonador magnético [Phillips Intera 1,5 T, bobina Sense Flex S Dual] en las secuencias; sagital DP-T2-Spir, coronal DP y dinámico ECHO gradiente y también fueron examinados por medio de Tomografía Computada (TC), con cortes de volúmenes-axiales y volúmenes-coronales de 625um de espesor [BrightSpeed®ELITE, General Electric, Milwaukee, USA)] tanto a boca abierta como cerrada, bajo los siguientes parámetros: FOV: 16.0cms, Algoritmo Hueso, Filtro Edge A2 y Matriz 512x512 pxs]. Los estudios imagenológicos de las ATMs formaron los siguientes ocho grupos: Grupo A: Ausencia de líquido (L) en ATM Derecha con Alteración Degenerativa (AD); Grupo B: Presencia de Líquido en ATM Derecha con AD; Grupo C: Ausencia de Líquido en ATM Izquierda con AD; Grupo D: Presencia de L en ATM Izquierda con AD; Grupo E: Ausencia de AD y Ausencia de L en ATM Derecha; Grupo F: Ausencia de AD y Presencia de L en ATM Derecha; Grupo G: Ausencia de L en ATM Izquierda; Grupo H: Presencia de L y ausencia de AD en ATM Izquierda. Los datos fueron analizados estadísticamente con la prueba Chi2 (Systat v12.0).ResultadoGrupo A: n= 61; Grupo B: n= 64; Grupo C: n= 54; Grupo D: n= 53; Grupo E; n=12; Grupo F; n=13; Grupo G: n=8 y Grupo H: n=5.ConclusiónNo existe asociación entre la presencia de líquido intra-articular y Alteraciones Degenerativas de las superficies articulares en la ATM.AbstractThe Objective of the present study was to determine the association between articular space effusion and degenerative bone disease in adult TMJ with internal derangement, previous any treatment, by images diagnosis.Materials y MethodsWere recruited 135 consecutives patients (X=33.3 years) that presented TMJ dysfunction were examined using Magnetic Resonance (MRI) [Phillips Intera 1,5 T, Sense Flex S Dual Coil] in sequences; sagital DP-T2-Spir, coronal DP and dynamic ECHO gradient and using Computed Tomography (TC) by axial-volumes slices and coronal-volumes slices of 625um of width [BrightSpeed®ELITE, General Electric, Milwaukee, USA], with the patient in open mouth and closed mouth under the next parameters: FOV: 16.0cms, Bone Algorithm, Edge Filter A2 and Matrix 512x512 pxs. The exclusion criteria was: patients below 16 years and above 65 years of age, patients using removable dental prosthetics, patients that presented systemic disease such as Gout Disease, Osteoarthrosis and hipermobility, anatomic structural alterations, Quistic or Tumor disease and TMJ surgery. The TMJ images studies formed the following eight groups: Group A: Absence of effusion (L) in right TMJ with Degenerative Disease (AD); Group B: Presence of L in right TMJ with AD; Grupo C: Absence of L in left TMJ with AD; Group D: Presence of L in left TMJ with AD; Group E: Absence of AD and absence of L in right TMJ; Group F: Absence of AD and presence of L in right TMJ; Group G: Absence of L in left TMJ; Group H: Presence of L and absence of AD in left TMJ. Data were statistically analyzed by Chi2 (Systat v12.0).ResultsGroup A: n= 61; Group B: n= 64; Group C: n= 54; Group D: n= 53; Group E; n=12; Group F; n=13; Group G: n=8 y Group H: n=5.ConclusionNo association was found between Degenerative Bone Disease and Temporo mandibular Joint Articular Space Effusion in TMJ

Chloridodimeth­yl(thio­semi­carbazide)tin(IV) chloride

In the title salt, [Sn(CH3)2Cl(CH4N3S)]Cl, the SnIV atom is five-coordinated in a distorted trigonal-bipyramidal geometry with two methyl groups and one S atom in the equatorial plane, and one N atom and one Cl atom occupying the apical positions. In the crystal, mol­ecules are linked by inter­molecular N—H⋯S hydrogen bonds with set graph-motif C(4) along [010]. N—H⋯ Cl hydrogen bonds with graph-set motif D(2) and D 3 3(10) link cations and anions

Padronização do extrato de Ruta graveolens L. e avaliação da sua atividade em Magnaporthe oryzae.

O objetivo deste estudo foi padronizar o extrato vegetal líquido de R. graveolens L. e avaliar seu potencial para o controle da brusone em arroz.Apresentação oral - Pós-graduação