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https://www.readbyqxmd.com/read/28346461/geometry-can-provide-long-range-mechanical-guidance-for-embryogenesis
#1
Mahamar Dicko, Pierre Saramito, Guy B Blanchard, Claire M Lye, Bénédicte Sanson, Jocelyn Étienne
Downstream of gene expression, effectors such as the actomyosin contractile machinery drive embryo morphogenesis. During Drosophila embryonic axis extension, actomyosin has a specific planar-polarised organisation, which is responsible for oriented cell intercalation. In addition to these cell rearrangements, cell shape changes also contribute to tissue deformation. While cell-autonomous dynamics are well described, understanding the tissue-scale behaviour challenges us to solve the corresponding mechanical problem at the scale of the whole embryo, since mechanical resistance of all neighbouring epithelia will feedback on individual cells...
March 27, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28345354/optimization-of-mold-wheat-bread-fortified-with-soy-flour-pea-flour-and-whey-protein-concentrate
#2
Melina Erben, Carlos A Osella
The objective of this work was to study the effect of replacing a selected wheat flour for defatted soy flour, pea flour and whey protein concentrate on both dough rheological characteristics and the performance and nutritional quality of bread. A mixture design was used to analyze the combination of the ingredients. The optimization process suggested that a mixture containing 88.8% of wheat flour, 8.2% of defatted soy flour, 0.0% of pea flour and 3.0% of whey protein concentrate could be a good combination to achieve the best fortified-bread nutritional quality...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/28345055/earthquake-rupture-below-the-brittle-ductile-transition-in-continental-lithospheric-mantle
#3
Germán A Prieto, Bérénice Froment, Chunquan Yu, Piero Poli, Rachel Abercrombie
Earthquakes deep in the continental lithosphere are rare and hard to interpret in our current understanding of temperature control on brittle failure. The recent lithospheric mantle earthquake with a moment magnitude of 4.8 at a depth of ~75 km in the Wyoming Craton was exceptionally well recorded and thus enabled us to probe the cause of these unusual earthquakes. On the basis of complete earthquake energy balance estimates using broadband waveforms and temperature estimates using surface heat flow and shear wave velocities, we argue that this earthquake occurred in response to ductile deformation at temperatures above 750°C...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28344473/d-%C3%AE-tocopherol-nanoemulsions-size-properties-rheological-behavior-surface-tension-osmolarity-and-cytotoxicity
#4
M C Teixeira, P Severino, T Andreani, P Boonme, A Santini, A M Silva, E B Souto
The aim of this study was the assessment of the physicochemical stability of d-α-tocopherol formulated in medium chain triglyceride nanoemulsions, stabilized with Tween®80 and Lipoid®S75 as surfactant and co-surfactant, respectively. d-α-tocopherol was selected as active ingredient because of its well-recognized interesting anti-oxidant properties (such as radical scavenger) for food and pharmaceutical industries. A series of nanoemulsions of mean droplet size below 90 nm (polydispersity index < 0...
February 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28344433/a-novel-investigation-of-a-micropolar-fluid-characterized-by-nonlinear-constitutive-diffusion-model-in-boundary-layer-flow-and-heat-transfer
#5
Jize Sui, Peng Zhao, Zhengdong Cheng, Liancun Zheng, Xinxin Zhang
The rheological and heat-conduction constitutive models of micropolar fluids (MFs), which are important non-Newtonian fluids, have been, until now, characterized by simple linear expressions, and as a consequence, the non-Newtonian performance of such fluids could not be effectively captured. Here, we establish the novel nonlinear constitutive models of a micropolar fluid and apply them to boundary layer flow and heat transfer problems. The nonlinear power law function of angular velocity is represented in the new models by employing generalized "n-diffusion theory," which has successfully described the characteristics of non-Newtonian fluids, such as shear-thinning and shear-thickening fluids...
February 2017: Physics of Fluids
https://www.readbyqxmd.com/read/28344172/physicochemical-attributes-and-dissolution-testing-of-ophthalmic-ointments
#6
Quanying Bao, Rajan Jog, Jie Shen, Bryan Newman, Yan Wang, Stephanie Choi, Diane J Burgess
The investigation of semisolid ophthalmic ointments is challenging due to their complex physicochemical properties and the unique anatomy of the human eye. Using Lotemax(®) as a model ophthalmic ointment, three different manufacturing processes and two excipient sources (Fisher(®) (OWP) and Fougera(®) (NWP)) were used to prepare loteprednol etabonate ointments that were qualitatively and quantitatively the same across the manufactured formulations. Physicochemical properties including drug content and uniformity, particle size and distribution, as well as rheological parameters (onset point, crossover modulus, storage modulus and Power law consistency index) were investigated...
March 23, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28343560/acoustic-levitation-of-liquid-drops-dynamics-manipulation-and-phase-transitions
#7
REVIEW
Duyang Zang, Yinkai Yu, Zhen Chen, Xiaoguang Li, Hongjing Wu, Xingguo Geng
The technique of acoustic levitation normally produces a standing wave and the potential well of the sound field can be used to trap small objects. Since no solid surface is involved it has been widely applied for the study of fluid physics, nucleation, bio/chemical processes, and various forms of soft matter. In this article, we survey the works on drop dynamics in acoustic levitation, focus on how the dynamic behavior is related to the rheological properties and discuss the possibility to develop a novel rheometer based on this technique...
March 18, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28343128/peroxy-titanium-complex-based-inks-for-low-temperature-compliant-anatase-thin-films
#8
N S Shabanov, A Sh Asvarov, A Chiolerio, K Sh Rabadanov, A B Isaev, F F Orudzhev, S Sh Makhmudov
Stable highly crystalline titanium dioxide colloids are of paramount importance for the establishment of a solution-processable library of materials that could help in bringing the advantages of digital printing to the world of photocatalysis and solar energy conversion. Nano-sized titanium dioxide in the anatase phase was synthesized by means of hydrothermal methods and treated with hydrogen peroxide to form Peroxy-Titanium Complexes (PTCs). The influence of hydrogen peroxide on the structural, optical and rheological properties of titanium dioxide and its colloidal solutions were assessed and a practical demonstration of a low temperature compliant digitally printed anatase thin film given...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28342753/evaluation-of-chitosan-as-a-wall-material-for-microencapsulation-of-squalene-by-spray-drying-characterization-and-oxidative-stability-studies
#9
Lekshmi R G Kumar, N S Chatterjee, C S Tejpal, K V Vishnu, K K Anas, K K Asha, R Anandan, Suseela Mathew
The present study was aimed at investigating the efficacy of chitosan as a wall material for microencapsulation of squalene by spray drying for functional food applications. Based on different core to wall material ratio (1:1, 0.5:1 and 0.3:1 on w/w basis), emulsions were prepared and evaluated in terms of emulsion stability, particle size, zeta potential, polydispersity Index (PDI), rheology and microstructure. The optimized emulsion combination was spray dried and characterized, physically and chemically...
March 22, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28342608/production-of-reuterin-in-a-fermented-milk-product-by-lactobacillus-reuteri-inhibition-of-pathogens-spoilage-microorganisms-and-lactic-acid-bacteria
#10
Y Ortiz-Rivera, R Sánchez-Vega, N Gutiérrez-Méndez, J León-Félix, C Acosta-Muñiz, D R Sepulveda
We assessed the antimicrobial activity of reuterin produced in vitro in glycerol aqueous solutions in situ by Lactobacillus reuteri ATCC 53608 as part of a fermented milk product against starter (Lactobacillus delbrueckii ssp. bulgaricus and Streptococcus thermophilus), spoilage (Penicillium expansum), pathogenic (Staphylococcus aureus, Salmonella enterica ssp. enterica, and Listeria monocytogenes), and pathogen surrogate (Escherichia coli DH5α) microorganisms. We also assayed the influence of cold storage (28 d at 4°C) and reuterin on the color and rheology of the fermented milk product...
March 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28341613/radical-scavenging-activity-of-a-sunscreen-enriched-by-antioxidants-providing-protection-in-the-whole-solar-spectral-range
#11
Carla Souza, Patrícia Maia Campos, Sabine Schanzer, Stephanie Albrecht, Silke B Lohan, Juergen Lademann, Maxim E Darvin, Martina C Meinke
The literature claims that incorporation of antioxidants into sunscreens provides additional skin photoprotection by scavenging free radicals formed due to sun radiation, but there are limited in vivo studies that support this hypothesis. This study aims to examine whether addition of antioxidants to a broad-spectrum sunscreen increases its photoprotective effect in real-use conditions. Sunscreen formulations composed of stable UV filters (Tinosorb® S, Tinosorb® M, Uvinul® APlus, and Uvinul® T150) alone or in combination with antioxidants (Spirulina and dimethylmethoxy chromanol-loaded solid lipid nanoparticles) were developed and their appearance, odor, rheological behavior, Sun Protection Factor (SPF), and UVA protection were analyzed...
March 21, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28337554/successive-relaxation-cycles-during-long-time-cell-aggregate-rounding-after-uni-axial-compression
#12
Ivana Pajic-Lijakovic, Milan Milivojevic
The mean features of cell surface rearrangement during cell aggregate rounding after uni-axial compression between parallel plates are considered. This is based on long-time rheological modeling approaches in order to shed further light on collective cell migration. Many aspects of cell migration at the supra-cellular level, such as the coordination between surrounding migrating cell groups that leads to uncorrelated motility, have remained unclear. Aggregate shape changes during rounding are considered depending on the size and homogeneity of 2-D and 3-D cell aggregates...
March 23, 2017: Journal of Biological Physics
https://www.readbyqxmd.com/read/28336886/preparation-and-electrochemical-properties-of-li%C3%A2-v%C3%A2-po%C3%A2-3-xbrx-carbon-composites-as-cathode-materials-for-lithium-ion-batteries
#13
Xiaoyu Cao, Lulu Mo, Limin Zhu, Lingling Xie
Li₃V₂(PO₄)3-xBrx/carbon (x = 0.08, 0.14, 0.20, and 0.26) composites as cathode materials for lithium-ion batteries were prepared through partially substituting PO₄(3-) with Br(-), via a rheological phase reaction method. The crystal structure and morphology of the as-prepared composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and electrochemical properties were evaluated by charge/discharge cycling and electrochemical impedance spectroscopy (EIS). XRD results reveal that the Li₃V₂(PO₄)3-xBrx/carbon composites with solid solution phase are well crystallized and have the same monoclinic structure as the pristine Li₃V₂(PO₄)₃/carbon composite...
February 24, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336858/one-step-reduction-and-surface-modification-of-graphene-oxide-by-3-hydroxy-2-naphthoic-acid-hydrazide-and-its-polypropylene-nanocomposites
#14
Xiang-Nan Xu, Xiao-Na Guan, Hui-Hua Zhou, Yue-Feng Zhu
3-Hydroxy-2-naphthoic acid hydrazide (HNH), a new reductant and modifier, was applied to reduce and modify graphene oxide (GO) in a one-step process. The obtained HNH reduced graphene oxide (HNH-rGO) was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Raman spectroscopy, X-ray photoelectron spectroscopic (XPS) and Fourier transform infrared spectra (FTIR). The results demonstrated that GO was successfully reduced to graphene and the surface of HNH-rGO was grafted with HNH. The interlayer space was increased from 0...
January 24, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336857/linear-and-nonlinear-rheology-combined-with-dielectric-spectroscopy-of-hybrid-polymer-nanocomposites-for-semiconductive-applications
#15
Roland Kádár, Mahdi Abbasi, Roxana Figuli, Mikael Rigdahl, Manfred Wilhelm
The linear and nonlinear oscillatory shear, extensional and combined rheology-dielectric spectroscopy of hybrid polymer nanocomposites for semiconductive applications were investigated in this study. The main focus was the influence of processing conditions on percolated poly(ethylene-butyl acrylate) (EBA) nanocomposite hybrids containing graphite nanoplatelets (GnP) and carbon black (CB). The rheological response of the samples was interpreted in terms of dispersion properties, filler distortion from processing, filler percolation, as well as the filler orientation and distribution dynamics inside the matrix...
January 24, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336278/thermoplastic-starch-composites-with-tio2-particles-preparation-morphology-rheology-and-mechanical-properties
#16
A Ostafińska, J Mikešová, S Krejčíková, M Nevoralová, A Šturcová, A Zhigunov, D Michálková, M Šlouf
Composites of thermoplastic starch (TPS) with titanium dioxide particles (mTiO2; average size 0.1μm) with very homogeneous matrix and well-dispersed filler were prepared by a two-step method, including solution casting (SC) followed by melt mixing (MM). Light and scanning electron microscopy confirmed that only the two-step procedure (SC+MM) resulted in ideally homogeneous TPS/mTiO2 systems. The composites prepared by single-step MM contained non-plasticized starch granules and the composites prepared by single-step SC suffered from mTiO2 agglomeration...
March 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28332847/phase-behavior-and-physical-properties-of-new-biobased-ionic-liquid-crystals
#17
Ariel Antonio Campos Toledo Hijo, Guilherme José Maximo, Mariana Conceição Costa, Rosiane Lopes Cunha, Jorge Fernando Brandão Pereira, Kiki Adi Kurnia, Eduardo A Caldas Batista, Antonio J A Meirelles
Protic ionic liquids (PILs) have emerged as promising compounds and attracted the interest of the industry and the academy community, due to their easy preparation and unique properties. In the context of green chemistry, the use of biocompounds, such as fatty acids for their synthesis could disclose a possible alternative way to produce ILs with low or non-toxic effect and consequently, expanding their applicability in bio-based processes or in the development of bioproducts. This work addressed efforts to a better comprehension of the complex Solid-Liquid-Crystal-Liquid thermodynamic equilibrium of twenty new PILs synthesized by using fatty acids commonly found in vegetable oils, as well as their rheological profile and self-assembling ability...
March 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28329442/poly-ether-ester-ionomers-as-water-soluble-polymers-for-material-extrusion-additive-manufacturing-processes
#18
Allison M Pekkanen, Callie Zawaski, André T Stevenson, Ross Dickerman, Abby R Whittington, Christopher B Williams, Timothy E Long
Water-soluble polymers as sacrificial supports for additive manufacturing (AM) facilitate complex features in printed objects. Few water-soluble polymers beyond poly(vinyl alcohol) enable material extrusion AM. In this work, charged poly(ether ester)s with tailored rheological and mechanical properties serve as novel materials for extrusion-based AM at low temperatures. Melt transesterification of poly(ethylene glycol) (PEG, 8k) and dimethyl 5-sulfoisophthalate afforded poly(ether ester)s of sufficient molecular weight to impart mechanical integrity...
March 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28328229/characterization-of-the-bonds-developed-between-calcium-silicate-hydrate-and-polycarboxylate-based-superplasticizers-with-silyl-functionalities
#19
Carlos A Orozco, Byong-Wa Zen Chun, Guoqing Geng, Abdul-Hamid Emwas, Paulo J M Monteiro
Major developments in concrete technology have been achieved with the use of polycarboxylate-based superplasticizers (PCEs) to improve the concrete rheology without increasing the mix water content. Currently, it is possible to control the fluidity of the fresh concrete and obtain stronger and more durable structures. Therefore, there is a strong incentive to understand the interactions between PCEs and cement hydrates at the atomic scale to design new customized functional PCEs according to the ever-increasing requirements of the concrete industry...
March 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28325445/nonlinear-model-on-pulsatile-flow-of-blood-through-a-porous-bifurcated-arterial-stenosis-in-the-presence-of-magnetic-field-and-periodic-body-acceleration
#20
R Ponalagusamy, S Priyadharshini
BACKGROUND AND OBJECTIVE: Background and Objective: The motivation of cardiovascular modeling is to understand the haemodynamic and mechanical factors in the diagnosis and treatment of cardiovascular diseases. Several investigations have been carried out by many authors to understand the flow properties of blood in modelling blood flows in the circulatory system. In the present article, the pulsatile flow of Herschel-Bulkley fluid through a bifurcated arterial stenosis in a porous medium with magnetic field and periodic body acceleration has been investigated in view of understanding the role of rheological behaviour of blood, stenotic height, bifurcation angle, magnetic field and porosity of wall in the initiation and proliferation of cardiovascular diseases...
April 2017: Computer Methods and Programs in Biomedicine
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