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https://www.readbyqxmd.com/read/29351458/differences-in-l-type-calcium-channel-activity-partially-underlie-the-regional-dichotomy-in-pumping-behavior-by-murine-peripheral-and-visceral-lymphatic-vessels
#1
Scott D Zawieja, Jorge A Castorena-Gonzalez, Joshua Scallan, Michael J Davis
We identified a regional dichotomy in murine lymphatic contractile function with regard to vessel location within either the periphery or visceral cavity. All vessels isolated from peripheral regions; cervical, popliteal, inguinal, axillary, and inter-nodal inguinal axillary (Ing-Ax) developed robust contractions with maximal ejection fractions (EFs) of 50-80% in our ex vivo isobaric myograph experiments. Conversely, vessels isolated from the visceral cavity (mesenteric, TD, and iliac) demonstrated maximal EFs below 15%...
January 5, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351357/changes-in-axial-length-and-progression-of-visual-field-damage-in-glaucoma
#2
Mieko Yanagisawa, Takehiro Yamashita, Masato Matsuura, Yuri Fujino, Hiroshi Murata, Ryo Asaoka
Purpose: To investigate the relationship between axial length (AL) elongation and progression of primary open-angle glaucoma (POAG). Methods: AL was measured twice over a 5.1 ± 0.76 (mean ± standard deviation: SD) year period in 125 eyes of 72 patients with POAG. The eyes were divided into not long (AL < 26 mm, 80 eyes) and long (>26 mm, 45 eyes) groups. During this period, patients' visual fields (VFs) were measured with the Humphrey Field Analyzer 12.4 ± 7...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29351322/influence-of-multiplicative-stochastic-variation-on-translational-elongation-rates
#3
Sandip Datta, Brian Seed
Experimental data indicate that stochastic effects exerted at the level of translation contribute substantially to the variation in abundance of proteins expressed at moderate to high levels. This study analyzes the theoretical consequences of fluctuations in residue-specific elongation rates during translation. A simple analytical framework shows that rate variation during elongation gives rise to protein production rates that consist of sums of products of random variables. Simulations show that because the contribution to total variation of products of random variables greatly exceeds that of sums of random variables, the overall distribution exhibits approximately log-normal behavior...
2018: PloS One
https://www.readbyqxmd.com/read/29351276/static-length-changes-of-cochlear-outer-hair-cells-can-tune-low-frequency-hearing
#4
Nikola Ciganović, Rebecca L Warren, Batu Keçeli, Stefan Jacob, Anders Fridberger, Tobias Reichenbach
The cochlea not only transduces sound-induced vibration into neural spikes, it also amplifies weak sound to boost its detection. Actuators of this active process are sensory outer hair cells in the organ of Corti, whereas the inner hair cells transduce the resulting motion into electric signals that propagate via the auditory nerve to the brain. However, how the outer hair cells modulate the stimulus to the inner hair cells remains unclear. Here, we combine theoretical modeling and experimental measurements near the cochlear apex to study the way in which length changes of the outer hair cells deform the organ of Corti...
January 19, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29351265/development-of-antimicrobial-biocomposite-films-to-preserve-the-quality-of-bread
#5
Kelly J Figueroa-Lopez, Margarita María Andrade-Mahecha, Olga Lucía Torres-Vargas
This study focused on the development of gelatin-based films with incorporation of microcrystalline cellulose as reinforcement material. Clove (Syzygium aromaticum), nutmeg (Myristica fragrans), and black pepper (Piper nigrum) oleoresins containing antimicrobial compounds of natural origin were incorporated into the films. The mechanical, thermal, optical, and structural properties, as well as color, seal strength and permeability to water vapor, light, and oil of the films were determined. Adding oleoresins to the gelatin matrix increased the elongation of the material and significantly diminished its permeability to water vapor and oil...
January 19, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29351074/two-nematode-species-from-freshwater-and-marine-fishes-in-thailand-including-ascarophis-scatophagi-sp-nov-cystidicolidae-from-scatophagus-argus-scatophagidae
#6
František Moravec, Thanapon Yooyen, Amornrat Sanprick
One new and one known species of parasitic nematodes are reported from Thailand for the first time: Falcaustra kaverii (Karve et Naik,1951) (Kathlaniidae) from the intestine of the freshwater fish Poropuntius deauratus (Valenciennes) (Cyprinidae) (new host record) and Ascarophis scatophagi sp. nov. (Cystidicolidae) from the intestine of the marine fish Scatophagus argus (Linnaeus) (Scatophagidae). The morphology of both these species was studied with the use of light (LM) and scanning electron microscopy (SEM) (the latter method used for F...
March 26, 2018: Acta Parasitologica
https://www.readbyqxmd.com/read/29350744/preventing-mesh-pore-collapse-by-designing-mesh-pores-with-auxetic-geometries-a-comprehensive-evaluation-via-computational-modeling
#7
Katrina Knight, Pamela Moalli, Steven D Abramowitch
Pelvic organ prolapse meshes are exposed to predominately tensile loading conditions in vivo that can lead to pore collapse by 70-90%, decreasing overall porosity, and providing a plausible mechanism for the contraction/shrinkage of mesh observed following implantation. To prevent pore collapse, we proposed to design synthetic meshes with a macrostructure that results in auxetic behavior, the pores expand laterally, instead of contracting when loaded. Such behavior can be achieved with a range of auxetic structures/geometries...
January 19, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29350314/eimeria-maricopensis-n-sp-apicomplexa-eimeriidae-from-the-arizona-cotton-rat-sigmodon-arizonae-mearns-rodentia-cricetidae-in-central-arizona-usa
#8
John A Hnida
Eimeria maricopensis n. sp. (Apicomplexa: Eimeriidae) is described from 2 of 15 (13%) Arizona cotton rats Sigmodon arizonae Mearns in Arizona, USA. Sporulated oöcysts of this new species are ovoidal to ellipsoidal, 20-28 × 16-22 (24.9 × 19.2) µm, with a smooth, bi-layered wall; both micropyle and oöcyst residuum are absent, but fragmented polar granule material is present. Sporocysts are ellipsoidal, 11-14 × 6-8 (12.9 × 7.0) µm, with a Stieda body, sub-Stieda body, and sporocyst residuum; sporozoites are elongate with a spheroidal anterior refractile body and a subspheroidal posterior refractile body...
January 19, 2018: Systematic Parasitology
https://www.readbyqxmd.com/read/29350232/impact-of-droplets-on-immiscible-liquid-films
#9
Zhizhao Che, Omar K Matar
The impact of droplets on liquid films is a ubiquitous phenomenon not only in nature but also in many industrial applications. Compared to the widely-studied impact of droplets on films of identical fluids, the impact of droplets on immiscible films has received far less attention. In the present work, we show using high-speed imaging that immiscibility has a profound effect on the impact dynamics. The impact of a water droplet on an oil film leads to the formation of a compound crown followed by a central jet, whereas that of an oil droplet on a water film results in rapid spreading on the film surface driven by a large, positive spreading factor...
January 19, 2018: Soft Matter
https://www.readbyqxmd.com/read/29349633/effects-of-tetradecylthioacetic-acid-tta-treatment-on-lipid-metabolism-in-salmon-hearts-in-vitro-and-in-vivo-studies
#10
Regin Arge, Jens-Erik Dessen, Tone-Kari Østbye, Bente Ruyter, Magny S Thomassen, Kjell-Arne Rørvik
In intensive farming of Atlantic salmon, a large proportion of observed mortality is related to cardiovascular diseases and circulatory failure, indicating insufficient robustness and inadequate cardiac performance. This paper reports on the use of tetradecylthioacetic acid (TTA) where the main objective was to enhance utilisation of fatty acids (FA), considered the main energy source of the heart. In this study, three experiments were conducted: (I) an in vivo study where salmon post-smolt were administrated dietary TTA in sea, (II) an in vitro study where isolated salmon heart cells were pre-stimulated with increasing doses of TTA and (III) an in vivo experiment where salmon post-smolt were subjected to injections with increasing doses of TTA...
January 19, 2018: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/29349455/on-the-h2-interactions-with-transition-metal-adatoms-supported-on-graphene-a-systematic-density-functional-study
#11
Montserrat Manadé, Francesc Viñes, Adrià Gil, Francesc Illas
The attachment of H2 to the full set of transition metal (TM) adatoms supported on graphene is studied by using density functional theory. Methodology validation calculations on the interactions of H2 with benzene and graphene show that any of the vdW corrections under study, the Grimme D2, D3, D3 with Becke-Jonson damping (D3BJ), and Tkatchenko-Scheffler methods, applied on the PBE functional, are similarly accurate in describing such subtle interactions, with an accuracy of almost 2 kJ mol-1 compared to experiments...
January 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29348782/adsorption-and-desulfurization-mechanism-of-thiophene-on-layered-fes-001-011-and-111-surfaces-a-dispersion-corrected-density-functional-theory-study
#12
Nelson Y Dzade, Nora H de Leeuw
Layered transition-metal chalcogenides have emerged as a fascinating new class of materials for catalysis. Here, we present periodic density functional theory (DFT) calculations of the adsorption of thiophene and the direct desulfurization reaction pathways on the (001), (011), and (111) surfaces of layered FeS. The fundamental aspects of the thiophene adsorption, including the initial adsorption geometries, adsorption energies, structural parameters, and electronic properties, are presented. From the calculated adsorption energies, we show that the flat adsorption geometries, wherein the thiophene molecule forms multiple π-bonds with the FeS surfaces, are energetically more favorable than the upright adsorption geometries, with the strength of adsorption decreasing in the order FeS(111) > FeS(011) > FeS(001)...
January 11, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/29348621/dynamic-cellular-maps-of-molecular-species-application-to-drug-target-interactions
#13
Carolina García, Alejandro Losada, Miguel A Sacristán, Juan Fernando Martínez-Leal, Carlos M Galmarini, M Pilar Lillo
The design of living cell studies aimed at deciphering the mechanism of action of drugs targeting proteins with multiple functions, expressed in a wide range of concentrations and cellular locations, is a real challenge. We recently showed that the antitumor drug plitidepsin (APL) localizes sufficiently close to the elongation factor eEF1A2 so as to suggest the formation of drug-protein complexes in living cells. Here we present an extension of our previous micro-spectroscopy study, that combines Generalized Polarization (GP) images, with the phasor approach and fluorescence lifetime imaging microscopy (FLIM), using a 7-aminocoumarin drug analog (APL*) as fluorescence tracer...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348575/quantitative-optical-nanophysiology-of-ca2-signaling-at-inner-hair-cell-active-zones
#14
Jakob Neef, Nicolai T Urban, Tzu-Lun Ohn, Thomas Frank, Philippe Jean, Stefan W Hell, Katrin I Willig, Tobias Moser
Ca2+ influx triggers the release of synaptic vesicles at the presynaptic active zone (AZ). A quantitative characterization of presynaptic Ca2+ signaling is critical for understanding synaptic transmission. However, this has remained challenging to establish at the required resolution. Here, we employ confocal and stimulated emission depletion (STED) microscopy to quantify the number (20-330) and arrangement (mostly linear 70 nm × 100-600 nm clusters) of Ca2+ channels at AZs of mouse cochlear inner hair cells (IHCs)...
January 18, 2018: Nature Communications
https://www.readbyqxmd.com/read/29348174/oligomer-formation-and-g-quadruplex-binding-by-purified-murine-rif1-protein-a-key-organizer-of-higher-order-chromatin-architecture
#15
Kenji Moriyama, Naoko Yoshizawa-Sugata, Hisao Masai
Rap1-interacting protein 1(Rif1) regulates telomere length in budding yeast. We previously reported that, in metazoans and fission yeast, Rif1 also plays pivotal roles in controlling genome-wide DNA replication timing. We proposed that Rif1 may assemble chromatin compartments that contain specific replication-timing domains by promoting chromatin loop formation. Rif1 also is involved in DNA lesion repair, restart after replication fork collapse, anti-apoptosis activities, replicative senescence, and transcriptional regulation...
January 18, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29347339/rheology-of-dense-granular-flows-for-elongated-particles
#16
Dániel B Nagy, Philippe Claudin, Tamás Börzsönyi, Ellák Somfai
We study the rheology of dense granular flows for frictionless spherocylinders by means of 3D numerical simulations. As in the case of spherical particles, the effective friction μ is an increasing function of the inertial number I, and we systematically investigate the dependence of μ on the particle aspect ratio Q, as well as that of the normal stress differences, the volume fraction, and the coordination number. We show in particular that the quasistatic friction coefficient is nonmonotonic with Q: from the spherical case Q=1, it first sharply increases, reaches a maximum around Q≃1...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347220/geometrical-properties-of-rigid-frictionless-granular-packings-as-a-function-of-particle-size-and-shape
#17
Jean-François Camenen, Yannick Descantes
Three-dimensional discrete numerical simulation is used to investigate the properties of close-packed frictionless granular assemblies as a function of particle polydispersity and shape. Unlike some experimental results, simulations show that disordered packings of pinacoids (eight-face convex polyhedra) achieve higher solid fraction values than amorphous packings of spherical or rounded particles, thus fulfilling the analog of Ulam's conjecture stated by Jiao and co-workers for random packings [Y. Jiao and S...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347101/formation-of-liquid-drops-at-an-orifice-and-dynamics-of-pinch-off-in-liquid-jets
#18
Manash Pratim Borthakur, Gautam Biswas, Dipankar Bandyopadhyay
This paper presents a numerical investigation of the dynamics of pinch-off in liquid drops and jets during injection of a liquid through an orifice into another fluid. The current study is carried out by solving axisymmetric Navier-Stokes equations and the interface is captured using a coupled level-set and volume-of-fluid approach. The delicate interplay of inertia and viscous effects plays a crucial role in deciding the dynamics of the formation as well as breakup of liquid drops and jets. In the dripping regime, the growth and breakup rate of a drop are studied and quantified by corroborating with theoretical predictions...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346880/emergence-and-detailed-structure-of-terraced-surfaces-produced-by-oblique-incidence-ion-sputtering
#19
Matt P Harrison, Daniel A Pearson, R Mark Bradley
We study the nanoscale terraced topographies that arise when a solid surface is bombarded with a broad ion beam that has a relatively high angle of incidence θ. We find that the surface is not completely flat between the regions in which the surface slope changes rapidly with position: Instead, small-amplitude ripples propagate along the surface. Our analytical work on these ripples yields their propagation velocity as well as the scaling behavior of their amplitude. Our simulations establish that the surfaces exhibit interrupted coarsening, i...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346291/filaments-production-and-fused-deposition-modelling-of-abs-carbon-nanotubes-composites
#20
Sithiprumnea Dul, Luca Fambri, Alessandro Pegoretti
Composite acrylonitrile-butadiene-styrene (ABS)/carbon nanotubes (CNT) filaments at 1, 2, 4, 6 and 8 wt %, suitable for fused deposition modelling (FDM) were obtained by using a completely solvent-free process based on direct melt compounding and extrusion. The optimal CNT content in the filaments for FDM was found to be 6 wt %; for this composite, a detailed investigation of the thermal, mechanical and electrical properties was performed. Presence of CNT in ABS filaments and 3D-printed parts resulted in a significant enhancement of the tensile modulus and strength, accompanied by a reduction of the elongation at break...
January 18, 2018: Nanomaterials
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