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https://www.readbyqxmd.com/read/28544269/a-novel-approach-for-early-evaluation-of-orthodontic-process-by-a-numerical-thermo-mechanical-analysis
#1
Z Heidary, A Mojra, M Shirazi, M Bazargan
The main objective of this paper is to propose a novel method that provides an opportunity to evaluate an orthodontic process at early phase of the treatment. This was accomplished by finding out a correlation between the applied orthodontic force and thermal variations in the tooth structure. To this end, geometry of the human tooth surrounded by the connective soft tissue called the periodontal ligament and the bone was constructed by employing dental CT scan images of a specific case. The periodontal ligament was modeled by finite strain viscoelastic model through a nonlinear stress-strain relation (hyperelasticity) and nonlinear stress-time relation (viscoelasticity)...
May 21, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28542312/comparative-transcriptome-profiling-of-a-thermal-resistant-vs-sensitive-silkworm-strain-in-response-to-high-temperature-under-stressful-humidity-condition
#2
Wenfu Xiao, Peng Chen, Jinshu Xiao, La Wang, Taihang Liu, Yunfei Wu, Feifan Dong, Yaming Jiang, Minhui Pan, Youhong Zhang, Cheng Lu
Thermotolerance is important particularly for poikilotherms such as insects. Understanding the mechanisms by which insects respond to high temperatures can provide insights into their adaptation to the environment. Therefore, in this study, we performed a transcriptome analysis of two silkworm strains with significantly different resistance to heat as well as humidity; the thermo-resistant strain 7532 and the thermos-sensitive strain Knobbed. We identified in total 4,944 differentially expressed genes (DEGs) using RNA-Seq...
2017: PloS One
https://www.readbyqxmd.com/read/28541684/ultrawide-thermo-optic-tuning-of-pbte-meta-atoms
#3
Tomer Lewi, Hayden A Evans, Nikita A Butakov, Jon A Schuller
Subwavelength Mie resonators have enabled new classes of optical antenna and nanophotonic devices and can act as the basic meta-atoms constituents of low-loss dielectric metasurfaces. In any application, tunable Mie resonances are key to achieving dynamic and reconfigurable operation. However, active tuning of these nanoantennas is still limited and usually results in sub-linewidth resonance tuning. Here, we demonstrate ultra-wide dynamic tuning of PbTe Mie resonators fabricated via both laser ablation and a novel solution-processing approach...
May 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28532231/external-coincidence-model-for-hypocotyl-thermomorphogenesis
#4
Young-Joon Park, Chung-Mo Park
High but nonstressful temperatures profoundly affect plant growth and developmental processes, termed thermomorphogenesis. Thermo-induced hypocotyl elongation is a typical thermomorphogenic trait, which contributes to cooling plant organs. It is known that external light signals and the circadian clock coordinate rhythmic hypocotyl growth. However, it was unclear how light, temperature, and circadian rhythms are harmonized during hypocotyl thermomorphogenesis. We have recently demonstrated that the E3 ubiquitin ligase CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) is activated at warm temperatures...
May 22, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28532096/preparation-of-nanocrystalline-forsterite-by-combustion-of-different-fuels-and-their-comparative-in-vitro-bioactivity-dissolution-behaviour-and-antibacterial-studies
#5
Rajan Choudhary, Prasanth Manohar, Jana Vecstaudza, Maria Josefa Yáñez-Gascón, Horacio Pérez Sánchez, Ramesh Nachimuthu, Janis Locs, Sasikumar Swamiappan
This study presents different fuels (Glycine and Urea) that can be used to synthesize nanocrystalline forsterite by the sol-gel combustion method. The weight change of precursor during thermal treatment was studied by thermo-gravimetric analysis (TGA). Pure forsterite was characterized by heating microscopy, Fourier transform infrared spectroscopy, X-ray Diffraction, Brunauer-Emmett-Teller, Scanning Electron Microscopy, and Energy dispersive X-ray spectroscopy. The HAP (hydroxyapatite) deposition ability, degradation and dissolution behaviour of forsterite was examined in simulated body fluid (SBF)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531234/directed-evolution-to-improve-the-catalytic-efficiency-of-urate-oxidase-from-bacillus-subtilis
#6
Wenjie Li, Shouteng Xu, Biao Zhang, Yelin Zhu, Yan Hua, Xin Kong, Lianhong Sun, Jiong Hong
Urate oxidase is a key enzyme in purine metabolism and catalyzes the oxidation of uric acid to allantoin. It is used to treat hyperuricemia and gout, and also in a diagnostic kit. In this study, error-prone polymerase chain reaction and staggered extension process was used to generate a mutant urate oxidase with improved enzyme activity from Bacillus subtilis. After several rounds of mutagenesis and screening, two mutants 6E9 and 8E279 were obtained which exhibited 2.99 and 3.43 times higher catalytic efficiency, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28530199/synthesis-of-ag-nps-impregnated-cellulose-composite-material-its-possible-role-in-wound-healing-and-photocatalysis
#7
Attarad Ali, Ihsan Ul Haq, Javeed Akhtar, Muhammad Sher, Naveed Ahmed, Muhammad Zia
Cellulose is the natural biopolymer normally used as supporting agent with enhanced applicability and properties. In present study, cellulose isolated from citrus waste is used for silver nanoparticles (Ag-NPs) impregnation by a simple and reproducible method. The Ag-NPs fabricated cellulose (Ag-Cel) was characterised by powder X-rays diffraction, Fortier transform infrared spectroscopy and scanning electron microscopy. The thermal stability was studied by thermo-gravimetric analysis. The antibacterial activity performed by disc diffusion assay reveals good zone of inhibition against Staphylococcus aureus and Escherichia coli by Ag-Cel as compared Ag-NPs...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28523615/a-facile-route-for-preparation-of-magnetic-biomass-activated-carbon-with-high-performance-for-removal-of-dye-pollutants
#8
Hao Luo, Shengxiao Zhang, Xiaoyan Li, Qiang Xu, Junshen Liu, Zhenhua Wang
A novel and simple method for preparing magnetic biomass activated carbon (BAC) was developed. The BAC was prepared by decomposing fallen leaves, and magnetic nanoparticles were grown in situ on BAC using solvothermal method. The prepared magnetic BAC was characterized with FT-IR, XRD, vibrating sample magnetometer, thermo-gravimetric apparatus, SEM, and high-resolution transmission electron microscope, and results indicate that BAC and magnetic nanoparticles were combined together successfully. To investigate the adsorption ability of the composites, several dyes were selected as sample pollutants, and the sorbent showed high adsorption capacity for the dyes...
May 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28515763/poly-ethylene-co-vinyl-alcohol-based-polymeric-thermo-responsive-nanocarriers-for-controlled-delivery-of-epirubicin-to-hepatocellular-carcinoma
#9
Farshid Hassanzadeh, Maryam Farzan, Jaleh Varshosaz, Ghadam Ali Khodarahmi, Sahar Maaleki, Mahboubeh Rostami
In this study, poly(ethylene-co-vinyl alcohol) (EVOH) as a novel biocompatible polymeric scaffold was surface modified by succinylation to get EVOHS and further pegylated to improve structural properties using methoxypolyethylene glycol (5000 Da) succinate (PEGS) along with targeting with retinoic acid (RA) to get final modified active and passive targeted conjugate (PEGS-EVOHS-RA) to evaluate its ability in carrying and delivery of epirubicin to hepatocellular carcinoma cell lines in response to varying temperatures...
April 2017: Research in Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28510456/thermo-responsive-pickering-emulsions-stabilized-by-silica-nanoparticles-in-combination-with-alkyl-polyoxyethylene-ether-nonionic-surfactant
#10
Yue Zhu, Ting Fu, Kaihong Liu, Qi Lin, Xiaomei Pei, Jianzhong Jiang, Zhenggang Cui, Bernard P Binks
We put forward a simple protocol to prepare thermo-responsive Pickering emulsions. Using hydrophilic silica nanoparticles in combination with a low concentration of alkyl polyoxyethylene monododecyl ether (C12En) nonionic surfactant as emulsifier, oil-in-water (o/w) emulsions can be obtained which are stable at room temperature but demulsified at elevated temperature. The stabilization can be restored once the separated mixture is cooled and re-homogenized, and this stabilization-destabilization behavior can be cycled many times...
May 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28509553/uncovering-the-thermo-kinetic-origins-of-phase-ordering-in-mixed-valence-antimony-tetroxide-by-first-principles-modeling
#11
Chang-Eun Kim, Su-Hyun Yoo, David F Bahr, Catherine Stampfl, Aloysius Soon
Phase ordering in the mixed-valence oxide Sb2O4 has been examined by density functional theory (DFT) calculations. We find that the ground-state total energies of the two phases (α and β) are almost degenerate and are highly sensitive to the choice of the approximation to the exchange correlation (xc) functional used in our calculations. Interestingly, with the inclusion of the zero-point energy corrections, the α phase is predicted to be the ground state polymorph for most xc functionals used. We also illustrate the pronounced stereochemical activity of Sb in these polymorphs of Sb2O4, setting an exception to the Keve and Skapski rule...
May 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28499184/effects-of-graphite-nanoparticles-on-nitrification-in-an-activated-sludge-system
#12
Qian Dong, Yanchen Liu, Hanchang Shi, Xia Huang
Graphite nanoparticles (GNPs) might result in unexpected effects during their transportation and transformation in wastewater treatment systems, including strong thermo-catalytic and catalytic effects and microbial cytotoxicity. In particular, the effects of GNPs on the nitrification process in activated sludge systems should be addressed. This study aimed to estimate the influence of GNPs on the nitrification process in a short-term nitrification reactor with exposure to different light sources. The results indicated that GNPs could only improve the efficiency of photothermal transformation slightly in the activated sludge system because of its photothermal effects under the standard illuminant (imitating 1 × sun)...
May 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28491925/no-camphor-toxicity-in-cambodian-infants
#13
Casey R Johnson, Samuel G Porter, Debra Coats, Kyly C Whitfield, Khin Mengkheang, Mark D Topazian, Philip R Fischer
Thiamine deficiency and beriberi are prevalent in Cambodia, although most infants with nonspecific clinical symptoms of beriberi, including tachypnea, lack echocardiographic evidence diagnostic of the disease. Camphor activates transient receptor potential vanilloid 3 (TRPV3), a nonselective ion channel expressed in the medial preoptic nucleus of the hypothalamus and thought to be important for thermo-sensitivity. Because camphorated ointments are used commonly among Cambodian infants, we hypothesized that topical camphor modulates thermoregulatory behaviors, causing beriberi-simulating tachypnea, separate from any influence of thiamine deficiency...
2017: Global Pediatric Health
https://www.readbyqxmd.com/read/28472883/mussel-inspired-thermoresponsive-polypeptide-pluronic-copolymers-for-versatile-surgical-adhesives-and-hemostasis
#14
Dedai Lu, Hongsen Wang, Ting'e Li, Yunfei Li, Fajuan Dou, Shaobo Sun, Hongyun Guo, Shiqi Liao, Zhiwang Yang, Qiangbing Wei, Ziqiang Lei
Inspired by marine mussel adhesive proteins, polymers with catechol side groups have been extensively explored in industrial and academic research. Here, Pluronic L-31 alcoholate ions were used as the initiator to prepare a series of polypeptide-Pluronic-polypeptide triblock copolymers via ring-opening polymerization of l-DOPA-N-carboxyanhydride (DOPA-NCA), l-arginine-NCA (Arg-NCA), l-cysteine-NCA (Cys-NCA), and ε-N-acryloyl lysine-NCA (Ac-Lys-NCA). These copolymers demonstrated good biodegradability, biocompatibility, and thermoresponsive properties...
May 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28471196/-the-importance-of-microrna-deregulation-in-the-molecular-pathogenesis-and-histological-transformation-of-follicular-lymphoma
#15
K Musilová, J Deván, L Zlámalíková, L Křen, H Móciková, V Procházka, J Mayer, M Trněný, A Janíková, M Mráz
BACKGROUND: Molecular pathogenesis of follicular lymphoma (FL) is characterized by substantial dysregulation of epigenetic regulators. Many cases of FL are associated with the aberrant expression of non-coding regulatory RNAs, namely microRNAs (miRNA). Here we studied changes in miRNA expression and their association with histological transformation of FL to diffuse large B-cell lymphoma (DLBCL). MATERIAL AND METHODS: To identify changes in miRNA levels during FL transformation we performed a global expression analysis of 377 miRNAs in 16 samples (8 pairs) from FL patients vs...
2017: Klinická Onkologie: Casopis Ceské a Slovenské Onkologické Spolecnosti
https://www.readbyqxmd.com/read/28471158/thermoresponsive-microcarriers-for-smart-release-of-hydrate-inhibitors-under-shear-flow
#16
Sang Seok Lee, Juwoon Park, Yutaek Seo, Shin-Hyun Kim
The hydrate formation in subsea pipelines can cause oil and gas well blowout. To avoid disasters, various chemical inhibitors have been developed to prevent or delay the hydrate formation and growth. Nevertheless, direct injection of the inhibitors results in environmental contamination and cross-suppression of inhibition performance in the presence of other inhibitors against corrosion and/or formation of scale, paraffin, and asphaltene. Here, we suggest a new class of microcarriers that encapsulate hydrate inhibitors at high concentration and release them on demand without active external triggering...
May 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28470825/three-in-one-go-thermo-solvent-and-catalytic-stability-by-engineering-the-cofactor-binding-element-of-amine-transaminases
#17
Tim Börner, Sebastian Rämisch, Sebastian Bartsch, Andreas Vogel, Patrick Adlercreutz, Carl Grey
Amine transaminases (ATA) catalyse enantioselectively the direct amination of ketones, but the insufficient stability during catalysis limits their industrial applicability. Recently, we revealed that ATAs suffer from a substrate-induced inactivation mechanism involving dissociation of the enzyme-cofactor intermediate. Here, we report on engineering the cofactor-ring binding element that also shapes the active site entrance. Only two point mutations in this motif improved thermo- and operational stability in both biphasic media and neat organic solvent...
May 3, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28465600/composition-and-temperature-dependence-of-self-diffusion-in-si1-x-ge-x-alloys
#18
Vassilis Saltas, Alexander Chroneos, Filippos Vallianatos
The knowledge of diffusion processes in semiconducting alloys is very important both technologically and from a theoretical point of view. Here we show that, self-diffusion in Si1-x Ge x alloys as a function of temperature and Ge concentration can be described by the cBΩ thermodynamic model. This model connects the activation Gibbs free energy of point defects formation and migration with the elastic and expansion properties of the bulk material. The approach allows the systematic investigation of point defect thermodynamic parameters such as activation enthalpy, activation entropy and activation volume, based on the thermo-elastic properties (bulk modulus and its derivatives, mean atomic volume and thermal expansion coefficient) of the two end-members of the Si1-x Ge x alloy...
May 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28453990/thermo-chemo-sonic-pre-digestion-of-waste-activated-sludge-for-yeast-cultivation-to-extract-lipids-for-biodiesel-production
#19
P Selvakumar, P Sivashanmugam
The low cost biosynthesis of microbial lipids are an efficient feedstock to replace plant based oil for biodiesel production. The present study objective is to explore the effect of thermo-chemo-sonic pre-digestion of municipal Waste Activated Sludge (WAS) to cultivate oleaginous L. starkeyi MTCC-1400 as a model organism to produce high yield biomass and lipid. Higher Suspended Solids (SS) reduction (20 and 15.71%) and Chemical Oxygen Demand (COD) solubilization (27.6 and 22.3%) were achieved at a Specific Energy (SE) input of 5569 kJ/kg for WAS digested with NaOH and KOH, respectively...
April 25, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28449578/molybdenum-sulfide-for-hydrogen-evolution-reaction-the-importance-of-solution-dynamic-wetting-behavior-in-the-drying-process
#20
Yu-Wen Chen, Shi-Yow Lin, Chia-Ying Chiang
MoSx serving as a hydrogen evolution reaction electrocatalyst is known for its morphology sensitive characteristic. The low temperature thermo-decomposition method provides an easy and energy saving pathway to produce highly active MoSx on carbon paper substrates. However, during the precursor solution drying process, the dynamics of liquid wetting behavior dominates the morphology of the precursor salt and eventually the morphology of MoSx. As a result, here, for the first time, by carefully pairing the substrate hydrophobicity and solvent polarity, the cohesive force between solvent molecules and adhesive force between solvent and carbon substrate can be tuned, and thus the MoSx morphology can be controlled...
May 5, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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