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https://www.readbyqxmd.com/read/28441392/radiation-effects-on-the-mixed-convection-flow-induced-by-an-inclined-stretching-cylinder-with-non-uniform-heat-source-sink
#1
Tasawar Hayat, Sajid Qayyum, Ahmed Alsaedi, Saleem Asghar
This study investigates the mixed convection flow of Jeffrey liquid by an impermeable inclined stretching cylinder. Thermal radiation and non-uniform heat source/sink are considered. The convective boundary conditions at surface are imposed. Nonlinear expressions of momentum, energy and concentration are transformed into dimensionless systems. Convergent homotopic solutions of the governing systems are worked out by employing homotopic procedure. Impact of physical variables on the velocity, temperature and concentration distributions are sketched and discussed...
2017: PloS One
https://www.readbyqxmd.com/read/28441032/observation-of-intermolecular-hydrogen-bonding-interactions-in-biosynthesized-and-biodegradable-poly-r-3-hydroxybutyrate-co-r-3-hydroxyhexanoate-in-chloroform-and-1-1-1-3-3-3-hexafluoro-2-propanol-hfip
#2
Brian J Sobieski, Isao Noda, John F Rabolt, D Bruce Chase
In this work, we describe polymer-solvent interactions in biosynthesized and biodegradable poly[(R)-3-hydroxybutyrate- co-(R)-3-hydroxyhexanoate] (PHBHx) and the atactic homopolymer, poly(3-hydroxybutyrate) (a-PHB), which were studied both as neat polymers and in solutions of chloroform and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP). Specifically, infrared frequency shifts of the carbonyl band were observed in semi-crystalline PHBHx, but not in a-PHB, because it cannot form the helical conformation required for crystallization...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28440834/an-approximate-full-dimensional-quantum-dynamics-study-of-the-mode-specificity-in-the-dissociative-chemisorption-of-d2o-on-rigid-cu-111
#3
Tianhui Liu, Bina Fu, Dong H Zhang
The mode specificity of the dissociative chemisorption of D2O on a rigid Cu(111) surface was investigated by calculating the approximate full-dimensional (9D) dissociation probabilities with the implementation of the seven-dimensional (7D) quantum dynamics calculations and site averaging approximations. The approximate 9D dissociation probabilities for D2O initially in various vibrational states were obtained by averaging the site-specific 7D results over 9 impact sites on an accurate 9D potential energy surface (PES)...
April 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28440820/a-pre-strain-strategy-for-developing-a-highly-stretchable-and-foldable-one-dimensional-conductive-cord-based-on-a-ag-nanowire-network
#4
Areum Kim, Jihoon Ahn, Hyewon Hwang, Eunsong Lee, Jooho Moon
A highly stretchable and foldable conductive cord was developed by depositing silver nanowires (AgNWs) on a polyurethane cord. The application of pre-strain to the cord during the deposition of AgNWs resulted in the formation of a wrinkled AgNW layer, thereby inducing structural stability towards stretching and bending. This conductive cord exhibited stable electric conduction under strain values of up to 167% and at a bending radius of 0.3 mm. Also, it could withstand a stretching test of 500 cycles at a strain of 50%...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440624/acid-base-catalysis-in-glycosidations-a-nature-derived-alternative-to-the-generally-employed-methodology
#5
Peng Peng, Richard R Schmidt
Inverting glycosyltransferases enforce in the active site an intramolecular, acid-base catalyzed glycosidation that, due to proximity of the donor anomeric carbon and the acceptor hydroxyl group, follows an SN2-type reaction. Spacers, tethering donor and acceptor via nonreacting functional groups, led in intramolecular glycosidations to excellent yields and, independent of the donor anomeric configuration, to either the α- or the β-anomer. The requirement of a demanding protecting group pattern confines the application of this efficient method...
April 25, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28439813/simultaneous-heavy-metal-removal-and-anthracene-biodegradation-by-the-oleaginous-bacteria-rhodococcus-opacus
#6
Lalit Goswami, N Arul Manikandan, Kannan Pakshirajan, G Pugazhenthi
This study investigated simultaneous heavy metals removal and anthracene biodegradation by Rhodococcus opacus at different initial anthracene concentrations in the range 50-200 mg L(-1). The heavy metals tested were Fe(III), Cu(II), Zn(II), Cd(II), Ni(II), and Pb(II) at 10 mg L(-1) initial concentration: The organism was found to be well capable of removing the heavy metals along with high anthracene biodegradation efficiency. However, anthracene biodegradation rate by the organism was reduced due to these heavy metals...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28439415/stretchable-biofuel-cells-as-wearable-textile-based-self-powered-sensors
#7
Itthipon Jeerapan, Juliane R Sempionatto, Adriana Pavinatto, Jung-Min You, Joseph Wang
Highly stretchable textile-based biofuel cells (BFCs), acting as effective self-powered sensors, have been fabricated using screen-printing of customized stress-enduring inks. Due to synergistic effects of nanomaterial-based engineered inks and the serpentine designs, these printable bioelectronic devices endure severe mechanical deformations, e.g., stretching, indentation, or torsional twisting. Glucose and lactate BFCs with the single enzyme and membrane-free configurations generated the maximum power density of 160 and 250 µW cm(-2) with the open circuit voltages of 0...
December 21, 2016: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28439142/amine-vs-carboxylic-acid-protonation-in-ortho-meta-and-para-aminobenzoic-acid-an-irmpd-spectroscopy-study
#8
Adam P Cismesia, Georgina R Nicholls, Nicolas C Polfer
Infrared multiple photon dissociation (IRMPD) spectroscopy and computational chemistry are applied to the ortho-, meta-, and para- positional isomers of aminobenzoic acid to investigate whether the amine or the carboxylic acid are the favored sites of proton attachment in the gas phase. The NH and OH stretching modes yield distinct patterns that establish the carboxylic acid as the site of protonation in para-aminobenzoic acid, as opposed to the amine group in ortho- and meta-aminobenzoic acid, in agreement with computed thermochemistries...
February 2017: Journal of Molecular Spectroscopy
https://www.readbyqxmd.com/read/28437952/real-time-observation-of-round-trip-resolved-spectral-dynamics-in-a-stabilized-fs-fiber-laser
#9
Bowen Li, Ying Yu, Xiaoming Wei, Yiqing Xu, Kevin K Tsia, Kenneth K Y Wong
Fiber-stretcher based phase-lock loop (PLL) is a mature technique in fiber mode-locked lasers for repetition-rate stabilization. However, undesired side effects may be induced if not properly handled, which is easily overlooked owing to the lack of single-shot spectral analyzers. Thanks to the ultrafast spectral analyzing capability of optical time-stretch, an intriguing spectral dynamics is observed in a repetition-rate-stabilized nonlinear polarization rotation (NPR) mode-locked laser. Under the dynamic state, the optical spectra of pulses undergo dramatic evolution in every round trip while the pulse energy is relatively constant...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437687/use-of-tourmaline-as-a-potential-petrogenetic-indicator-in-the-determination-of-host-magma-crs-xrd-and-ped-xrf-methods
#10
Bahattin Gullu, Yusuf Kagan Kadioglu
Tourmaline defines a group of complex borosilicate forms as accessory mineral in igneous and metamorphic rocks and they act an important role in the interpretation of the chemical composition changes of the composition of the host fluid of the magma. The variety of tourmaline can be identified by using optical microscopy, X-Ray Diffraction (XRD) and by determining its chemical composition through Polarized Energy Dispersive X-Ray Fluorescence (PED-XRF) methods. However, microscopic investigations and XRD analyses are not quite adequate for detailed determination of tourmaline sub-groups...
April 19, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28437109/structure-of-the-fundamental-lipopeptide-surfactin-at-the-air-water-interface-investigated-by-sum-frequency-generation-spectroscopy
#11
Sami Alhassan Goussous, Michael Thomas Lee Casford, Annabel C Murphy, George Salmond, Finian J Leeper, Paul B Davies
The lipopeptide surfactin produced by certain strains of Bacillus subtilis is a powerful bio-surfactant possessing potentially useful antimicrobial properties. In order to better understand its surface behaviour, we have used surface sensitive Sum Frequency Generation (SFG) vibrational spectroscopy in the C-H and C=O stretching regions to determine its structure at the air/water interface. Using surfactin with the leucine groups of the peptide ring perdeuterated we have shown that the majority of the SFG signals arise from the 4 leucine residues...
April 24, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28437068/observing-the-overgrowth-of-a-second-metal-on-silver-cubic-seeds-in-solution-by-surface-enhanced-raman-scattering
#12
Yun Zhang, Jingyue Liu, Jaewan Ahn, Ting-Hui Xiao, Zhi-Yuan Li, Dong Qin
We report the development of an isocyanide-based molecular probe for in situ characterizing the overgrowth of a second metal on silver nanocrystal seeds in solution by surface-enhanced Raman scattering (SERS). As the first demonstration, we elucidate that the vibrational frequency of 2,6-dimethylphenyl isocyanide (2,6-DMPI) can serve as a distinctive reporter for capturing the nucleation of Pt on the edges of Ag nanocubes in the aqueous solution containing a Pt precursor, ascorbic acid, and poly(vinylpyrrolidone) under ambient condition...
April 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28436746/penetration-time-profiles-for-two-class-3b-lasers-in-in-situ-human-achilles-at-rest-and-stretched
#13
Daniel Huseby Bordvik, Sturla Haslerud, Ingvill Fjell Naterstad, Rodrigo Alvaro Brandão Lopes-Martins, Ernesto Cesar Pinto Leal Junior, Jan Magnus Bjordal, Jon Joensen
BACKGROUND AND OBJECTIVE: The majority of studies investigating penetration of laser light are performed in vitro on skin flaps, with measures of immediate penetration depth and energy loss. The aim of this study was to investigate the penetration time profiles for two different lasers used in low-level laser therapy, during 150 sec of exposure both in stretched and relaxed human Achilles in situ. MATERIALS AND METHODS: Thirty-four Achilles tendons from 17 healthy volunteers were irradiated by an 810 nm, 200 mW, continuous- and a 904 nm, 60 mW, super-pulsed laser...
April 21, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28436672/kinetic-energy-density-as-a-predictor-of-hydrogen-bonded-oh-stretching-frequencies
#14
Joseph R Lane, Anne Schou Hansen, Kasper Mackeprang, Henrik Grum Kjærgaard
This work considers the nature of the intermolecular hydrogen bond in a series of 15 different complexes with OH donor groups and N, O, P or S acceptor atoms. To complement the existing literature, room temperature gas phase vibrational spectra of the methanol-pyridine, ethanol-pyridine and 2,2,2-trifluoroethanol-pyridine complexes were recorded. These complexes were chosen as they exhibit hydrogen bonds of intermediate strength as compared to previous investigations that involved strong or weak hydrogen bonds...
April 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28436556/theoretical-evidence-for-bond-stretch-isomerism-in-grubbs-olefin-metathesis
#15
Premaja R Remya, Cherumuttathu H Suresh
A comprehensive density functional theory study on the dissociative and associative mechanisms of Grubbs first and second generation olefin metathesis catalysis reveals that ruthenacyclobutane intermediate (RuCB) observed in the Chauvin mechanism is not unique as it can change to a non-metathetic ruthenacyclobutane (RuCB') via the phenomenon of bond stretch isomerism (BSI). RuCB and RuCB' differ mainly in RuCα , RuCβ , and Cα Cβ bond lengths of the metallacycle. RuCB is metathesis active due to the agostic type bonding-assisted simultaneous activation of both Cα Cβ bonds, giving hypercoordinate character to Cβ whereas an absence of such bonding interactions in RuCB' leads to typical CC single bond distances and metathesis inactivity...
April 24, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28436426/stretchable-ag-electrodes-with-mechanically-tunable-optical-transmittance-on-wavy-patterned-pdms-substrates
#16
Eun-Hye Ko, Hyo-Joong Kim, Sang-Mok Lee, Tae-Woong Kim, Han-Ki Kim
We report on semi-transparent stretchable Ag films coated on a wavy-patterned polydimethylsiloxane (PDMS) substrate for use as stretchable electrodes for stretchable and transparent electronics. To improve the mechanical stretchability of the Ag films, we optimized the wavy-pattern of the PDMS substrate as a function of UV-ozone treatment time and pre-strain of the PDMS substrate. In addition, we investigated the effect of the Ag thickness on the mechanical stretchability of the Ag electrode formed on the wavy-patterned PDMS substrate...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28435258/quantum-dots-modulate-intracellular-ca-2-level-in-lung-epithelial-cells
#17
Huijuan Yin, Jacopo M Fontana, Johan Solandt, Johnny Israelsson Jussi, Hao Xu, Hjalmar Brismar, Ying Fu
While adverse effects of nanoparticles on lung health have previously been proposed, few studies have addressed the direct effects of nanoparticle exposure on the airway epithelium. In this work, we examine the response of the pulmonary airway to nanoparticles by measuring intracellular Ca(2+) concentration ([Ca(2+)]i) in the Calu-3 epithelial layer stimulated by 3-mercaptopropionic-acid (3MPA) coated CdSe-CdS/ZnS core-multishell quantum dots (QDs). Simultaneous transient transepithelial electrical resistance (TEER) decrease and global [Ca(2+)]i increase in Calu-3 epithelial layer, accompanied by cell displacements, contraction, and expansion, were observed under QD deposition...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28435080/investigating-mechanisms-of-tendon-damage-by-measuring-multi-scale-recovery-following-tensile-loading
#18
Andrea H Lee, Spencer E Szczesny, Michael H Santare, Dawn M Elliott
Tendon pathology is associated with damage. While tendon damage is likely initiated by mechanical loading, little is known about the specific etiology. Damage is defined as an irreversible change in the microstructure that alters the macroscopic mechanical parameters. In tendon, the link between mechanical loading and microstructural damage, resulting in macroscopic changes, is not fully elucidated. In addition, tendon damage at the macroscale has been proposed to initiate when tendon is loaded beyond a strain threshold, yet the metrics to define the damage threshold are not determined...
April 20, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28433746/transforming-growth-factor-beta-1-signaling-regulates-neuroinflammation-and-apoptosis-in-mild-traumatic-brain-injury
#19
Rachel K Patel, Nithisha Prasad, Ram Kuwar, Debanjan Haldar, P M Abdul-Muneer
Mild Traumatic brain injury (mTBI) is a low-level injury, which often remains undiagnosed, and in most cases it leads to death and disability as it advances as secondary injury. Therefore, it is important to study the underlying signaling mechanisms of mTBI-associated neurological ailments. While transforming growth factor-beta1 (TGF-β1) has a significant role in inflammation and apoptosis in myriads of other pathophysiological conditions, the precise function of increased TGF-β1 after mTBI is unknown. In this study, our objective is to study the physiological relevance and associated mechanisms of TGF-β1-mediated inflammation and apoptosis in mTBI...
April 19, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28433712/common-phox2b-poly-alanine-contractions-impair-ret-gene-transcription-predisposing-to-hirschsprung-disease
#20
Eleonora Di Zanni, Annalisa Adamo, Elga Belligni, Margherita Lerone, Giuseppe Martucciello, Girolamo Mattioli, Alessio Pini Prato, Roberto Ravazzolo, Margherita Silengo, Tiziana Bachetti, Isabella Ceccherini
HSCR is a congenital disorder of the enteric nervous system, characterized by the absence of neurons along a variable length of the gut resulting from loss-of-function RET mutations. Congenital Central Hypoventilation Syndrome (CCHS) is a rare neurocristopathy characterized by impaired response to hypercapnia and hypoxemia caused by heterozygous mutations of the PHOX2B gene, mostly polyalanine (polyA) expansions but also missense, nonsense, and frameshift mutations, while polyA contractions are common in the population and believed neutral...
April 19, 2017: Biochimica et Biophysica Acta
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