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https://www.readbyqxmd.com/read/28222264/graphene-ink-laminate-structures-on-polyvinylidene-difluoride-pvdf-for-pyroelectric-thermal-energy-harvesting-and-waste-heat-recovery
#1
Daniel Zabek, Kris Seunarine, Chris Spacie, Chris R Bowen
Thermal energy can be effectively converted into electricity using pyroelectrics, which act as small scale power generator and energy harvesters providing nW to mW of electrical power. In this paper, a novel pyroelectric harvester based on free standing polyvinilidene difluoride (PVDF) was manufactured that exploits the high thermal radiation absorbance of a screen printed graphene-ink electrode structure to facilitate the conversion of the available thermal radiation energy into electrical energy. The interconnected graphene nanoplatelets (GNPs) enable high thermal radiation absorbance and high electrical conductivity along with the ease of deposition using a screen print technique...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28222261/enhanced-release-of-molecules-upon-uv-light-irradiation-from-photoresponsive-hydrogels-prepared-from-bifunctional-azobenzene-and-four-arm-poly-ethylene-glycol
#2
Shiva Kumar Rastogi, Hailee E Anderson, Joseph Lamas, Scott L Barrett, Travis Cantu, Stefan Zauscher, William J Brittain, Tania Betancourt
Advances in biosensors and drug delivery depend on hydrogels that respond to external stimuli. In this work we de-scribe the preparation and characterization of photoresponsive hydrogels prepared by crosslinking of di-NHS ester of azobenzoic acid and four-armed, amine-terminated poly(ethylene glycol). The porous structure and composition of the hydrogels were confirmed by scanning electron microscopy and Fourier transform infrared (FTIR) spectroscopy. The reversible photoisomerization of the azobenzene-containing hydrogel crosslinkers in the gels was confirmed by ab-sorption spectroscopy...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28222259/band-alignment-at-gan-single-layer-wse2-interface
#3
Malleswararao Tangi, Pawan Mishra, Chien-Chih Tseng, Tien Khee Ng, Mohamed Nejib Hedhili, Dalaver H Anjum, Mohd Sharizal Alias, Nini Wei, Lain-Jong Li, Boon S Ooi
We study the band discontinuity at the GaN/single-layer (SL) WSe2 heterointerface. The GaN thin layer is epitaxially grown by molecular beam epitaxy on chemically vapor deposited SL-WSe2/c-sapphire. We confirm that the WSe2 was formed as an SL from structural and optical analyses using atomic force microscopy, scanning transmission electron microscopy, micro-Raman, absorbance, and micro-photoluminescence spectra. The determination of band offset parameters at the GaN/SL-WSe2 heterojunction is obtained by high-resolution x-ray photoelectron spectroscopy, electron affinities and the electronic bandgap values of SL-WSe2 and GaN...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28222232/dietary-total-antioxidant-capacity-in-early-school-age-and-subsequent-allergic-disease
#4
Anna Gref, Susanne Rautiainen, Olena Gruzieva, Niclas Håkansson, Inger Kull, Göran Pershagen, Magnus Wickman, Alicja Wolk, Erik Melén, Anna Bergström
BACKGROUND: Dietary antioxidant intake has been hypothesized to influence the development of allergic diseases, however, few prospective studies have investigated this association. OBJECTIVE: Our aim was to study the association between total antioxidant capacity (TAC) of the diet at age 8 years and the subsequent development of asthma, rhinitis and sensitization to inhalant allergens between 8 and 16 years, and to assess potential effect modification by known risk factors...
February 21, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28222107/transcriptional-response-to-131i-exposure-of-rat-thyroid-gland
#5
Nils Rudqvist, Johan Spetz, Emil Schüler, Toshima Z Parris, Britta Langen, Khalil Helou, Eva Forssell-Aronsson
Humans are exposed to 131I in medical diagnostics and treatment but also from nuclear accidents, and better knowledge of the molecular response in thyroid is needed. The aim of the study was to examine the transcriptional response in thyroid tissue 24 h after 131I administration in rats. The exposure levels were chosen to simulate both the clinical situation and the case of nuclear fallout. Thirty-six male rats were i.v. injected with 0-4700 kBq 131I, and killed at 24 h after injection (Dthyroid = 0.0058-3...
2017: PloS One
https://www.readbyqxmd.com/read/28221940/development-of-multifunctional-active-film-and-its-application-in-modified-atmosphere-packaging-of-shiitake-mushrooms
#6
Hong Jiang Wang, Duck Soon An, Dong Sun Lee
Agar-based films with multiple functions (CO2 absorption, water vapor absorption, and antimicrobial activity) were developed, tested for their properties, and then applied to the packaging of fresh shiitake mushrooms as an insert label. The films were cast from an agar-based aqueous solution containing a dissolving plasticizer (glycerol), a CO2 absorbent (sodium carbonate [SC] alone or a combination of SC and sodium glycinate [SC-SG]), and a volatile antimicrobial agent (carvacrol [CRV]). The agar of the film matrix is designed to serve as a water vapor absorbent...
September 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221181/lower-facial-rejuvenation-using-absorbable-casting-barbed-thread
#7
Woon Il Baek, Woo Seob Kim, Joon Hyuk Suh, Beom Joon Kim
No abstract text is available yet for this article.
February 17, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28220793/modulated-self-reversed-magnetic-hysteresis-in-iron-oxides
#8
Ji Ma, Kezheng Chen
The steadfast rule of a ferromagnetic hysteresis loop claims its saturation positioned within the first and third quadrants, whereas its saturation positioned in the second and fourth quadrants (named as self-reversed magnetic hysteresis) is usually taken as an experimental artifact and is always intentionally ignored. In this report, a new insight in this unique hysteresis phenomenon and its modulation were discussed in depth. Different iron oxides (magnetite, maghemite and hematite) with varying dimensions were soaked in FeCl3 aqueous solution and absorbed Fe(3+) cations due to their negative enough surface zeta potentials...
February 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28220385/selective-adsorption-and-recycle-of-cu-2-from-aqueous-solution-by-modified-sugarcane-bagasse-under-dynamic-condition
#9
Jia-Dong Chen, Jun-Xia Yu, Fen Wang, Jia-Qi Tang, Yue-Fei Zhang, Yuan-Lai Xu, Ru-An Chi
Tetraethylenepentamine modified sugarcane bagasse was prepared and applied to test its feasibility in removing and recovering Cu(2+) from wastewater under dynamic condition. Results showed that the Cu(2+) could be selectively absorbed from wastewater by the modified SCB fixed bed column. To understand the adsorption mechanism, Cd(2+) had been selected as the model interfering ion to investigate how co-ions influence the adsorption of Cu(2+) on the sorbent. It was observed that the adsorption capacity of the sorbent for Cu(2+) (0...
February 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28220278/rhodamine-diaminomaleonitrile-conjugate-as-a-novel-colorimetric-fluorescent-sensor-for-recognition-of-cd-2-ion
#10
Perumal Sakthivel, Karuppannan Sekar, Gandhi Sivaraman, Subramanian Singaravadivel
Rhodamine diaminomaleonitrile linked probe (RD-1) shows highly sensitive colorimetric and selective turn-on fluorescent response to Cd(2+) over other metal ions. The fluorescence intensity and absorbance of the probe RD-1 showed a good linearity, with very low detection limits of 18.5 nm. The probe RD-1 was preliminarily applied to the determination of Cd(2+) ion in water samples from river and tap water with satisfying results. The live cell image confocal microscopy, HeLa cell demonstrated that RD-1 had low cytotoxicity with good membrane permeable property is successfully applied to fluorescence microscopic imaging for the detection of Cd(2+) ions...
February 21, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28220004/strong-coupling-in-hybrid-metal-dielectric-nanoresonators
#11
M Decker, T Pertsch, I Staude
We study resonant photonic-plasmonic coupling between a gold dipole nanoantenna and a silicon nanodisc supporting electric and magnetic dipolar Mie-type resonances. Specifically, we consider two different cases for the mode structure of the silicon nanodisc, namely spectrally separate and spectrally matching electric and magnetic dipolar Mie-type resonances. In the latter case, the dielectric nanoparticle scatters the far fields of a unidirectional Huygens' source. Our results reveal an anticrossing of the plasmonic dipole resonance and the magnetic Mie-type dipole resonance of the silicon nanodisc, accompanied by a clear signature of photonic-plasmonic mode hybridization in the corresponding mode profiles...
March 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28219998/intensity-dependences-of-the-nonlinear-optical-excitation-of-plasmons-in-graphene
#12
T J Constant, S M Hornett, D E Chang, E Hendry
Recently, we demonstrated an all-optical coupling scheme for plasmons, which takes advantage of the intrinsic nonlinear optical response of graphene. Frequency mixing using free-space, visible light pulses generates surface plasmons in a planar graphene sample, where the phase matching condition can define both the wavevector and energy of surface waves and intraband transitions. Here, we also show that the plasmon generation process is strongly intensity-dependent, with resonance features washed out for absorbed pulse fluences greater than 0...
March 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28219038/green-synthesis-characterization-and-catalytic-activity-of-silver-nanoparticles-using-cassia-auriculata-flower-extract-separated-fraction
#13
Karuppiah Muthu, Sethuraman Priya
Cassia auriculata L., the flower aqueous extract was fractionated by separating funnel using n-hexane (A1), chloroform (A2), ethyl acetate (A3) and triple distilled water (A4). The A4 fraction was concentrated and determined the presence of preliminary phytochemicals such as tannins, flavonoids, glycosides, carbohydrates and polyphenolic compounds. These phytochemical compounds acted as reducing as well as a stabilizing agent in the green synthesis of Ag NPs from aqueous silver ions. Initially, the colour change and UV-vis absorbance surface Plasmon resonance strong, wide band located at 435nm has confirmed the synthesis of Ag NPs...
February 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28218406/randomized-clinical-trial-of-mesh-fixation-with-glue-or-sutures-for-lichtenstein-hernia-repair
#14
C Hoyuela, M Juvany, F Carvajal, A Veres, D Troyano, M Trias, A Martrat, J Ardid, J Obiols, M López-Cano
BACKGROUND: Pain is the most likely reason for delay in resuming normal activities after groin hernia repair. The primary aim of this study was to determine whether the use of glue to fix the mesh instead of sutures reduced acute postoperative pain after inguinal hernia repair. Secondary objectives were to compare postoperative complications, chronic pain and early recurrence rates during 1-year follow-up. METHODS: Some 370 patients who underwent Lichtenstein hernia repair were randomized to receive either glue (Histoacryl®) or non-absorbable polypropylene sutures for fixation of lightweight polypropylene mesh...
February 20, 2017: British Journal of Surgery
https://www.readbyqxmd.com/read/28218404/topical-medication-instillation-techniques-for-glaucoma
#15
REVIEW
Li Xu, Xuemei Wang, Meijing Wu
BACKGROUND: Glaucoma is a leading cause of irreversible blindness worldwide and the second most common cause of blindness after cataracts. The primary treatment for glaucoma aims to lower intraocular pressure (IOP) with the use of topical medicines. Topical medication instillation techniques, such as eyelid closure and nasolacrimal occlusion when instilling drops, have been proposed as potential methods to increase ocular absorption and decrease systemic absorption of the drops. OBJECTIVES: To investigate the effectiveness of topical medication instillation techniques compared with usual care or another method of instillation of topical medication in the management of glaucoma or ocular hypertension...
February 20, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28218331/ultrafast-photochemistry-of-the-bc1-complex
#16
Marten H Vos, Brandon J Reeder, Fevzi Daldal, Ursula Liebl
We present a full investigation of ultrafast light-induced events in the membraneous cytochrome bc1 complex by transient absorption spectroscopy. This energy-transducing complex harbors four redox-active components per monomer: heme c1, two 6-coordinate b-hemes and a [2Fe-2S] cluster. Using excitation of these components in different ratios under various excitation conditions, probing in the full visible range and under three well-defined redox conditions, we demonstrate that for all ferrous hemes of the complex photodissociation of axial ligands takes place and that they rebind in 5-7 ps, as in other 6-coordinate heme proteins, including cytoglobin, which is included as a reference in this study...
February 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28218304/laser-calorimetry-spectroscopy-for-ppm-level-dissolved-gas-detection-and-analysis
#17
Nagapriya K S, Shashank Sinha, Prashanth R, Samhitha Poonacha, Gunaranjan Chaudhry, Anandaroop Bhattacharya, Niloy Choudhury, Saroj Mahalik, Sandip Maity
In this paper we report a newly developed technique - laser calorimetry spectroscopy (LCS), which is a combination of laser absorption spectroscopy and calorimetry - for the detection of gases dissolved in liquids. The technique involves determination of concentration of a dissolved gas by irradiating the liquid with light of a wavelength where the gas absorbs, and measuring the temperature change caused by the absorbance. Conventionally, detection of dissolved gases with sufficient sensitivity and specificity was done by first extracting the gases from the liquid and then analyzing the gases using techniques such as gas chromatography...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28217070/hyperkalemia-caused-by-rapid-red-cell-transfusion-and-the-potassium-absorption-filter
#18
Yasuhiko Imashuku, Hirotoshi Kitagawa, Takayoshi Mizuno, Yutaka Fukushima
We report a case of transient hyperkalemia during hysterectomy after cesarean section, due to preoperatively undiagnosed placenta accreta that caused unforeseen massive hemorrhage and required rapid red cell transfusion. Hyperkalemia-induced by rapid red cell transfusion is a well-known severe complication of transfusion; however, in patients with sudden massive hemorrhage, rapid red cell transfusion is necessary to save their life. In such cases, it is extremely important to monitor serum potassium levels...
January 2017: Saudi Journal of Anaesthesia
https://www.readbyqxmd.com/read/28216581/biopharmaceutical-characterization-and-bioavailability-study-of-a-tetrazole-analog-of-clofibric-acid-in-rat
#19
Nancy Vara-Gama, Adriana Valladares-Méndez, Gabriel Navarrete-Vazquez, Samuel Estrada-Soto, Luis Manuel Orozco-Castellanos, Julio César Rivera-Leyva
In the current investigation, the physicochemical, biopharmaceutical and pharmacokinetic characterization of a new clofibric acid analog (Compound 1) was evaluated. Compound 1 showed affinity by lipophilic phase in 1 to 5 pH interval, indicating that this compound would be absorbed favorably in duodenum or jejunum. Also, Compound 1 possess two ionic species, first above of pH 4.43 and, the second one is present over pH 6.08. The apparent permeability in everted sac rat intestine model was 8.73 × 10(-6) cm/s in duodenum and 1...
February 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28216567/wine-flavonoids-in-health-and-disease-prevention
#20
Iva Fernandes, Rosa Pérez-Gregorio, Susana Soares, Nuno Mateus, Victor de Freitas
Wine, and particularly red wine, is a beverage with a great chemical complexity that is in continuous evolution. Chemically, wine is a hydroalcoholic solution (~78% water) that comprises a wide variety of chemical components, including aldehydes, esters, ketones, lipids, minerals, organic acids, phenolics, soluble proteins, sugars and vitamins. Flavonoids constitute a major group of polyphenolic compounds which are directly associated with the organoleptic and health-promoting properties of red wine. However, due to the insufficient epidemiological and in vivo evidences on this subject, the presence of a high number of variables such as human age, metabolism, the presence of alcohol, the complex wine chemistry, and the wide array of in vivo biological effects of these compounds suggest that only cautious conclusions may be drawn from studies focusing on the direct effect of wine and any specific health issue...
February 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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