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https://www.readbyqxmd.com/read/29139298/sic-nanofiber-mat-a-broadband-microwave-absorber-and-the-alignment-effect
#1
Yi Hou, Laifei Cheng, Yani Zhang, Yong Yang, Chaoran Deng, Zhihong Yang, Qi Chen, Xiaoqing Du, Lianxi Zheng
Fiber alignment is a key factor that determines the physical properties of nanofiber mats. In this work, SiC nanofiber mats with or without fiber alignment are fabricated via electrospinning and the microwave electromagnetic (EM) properties of their silicone resin composites (5wt.%) are investigated in 2-18 GHz. By comparing with the composite containing smashed nanofiber, it is found that the nanofiber mats show superior dielectric loss and a minimal reflection loss (RL) of around -49 dB at 8.6 GHz and 4.3 mm thickness, associated with a broad effective absorption (<-10 dB) bandwidth (EAB) of about 7...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29137776/effect-of-ultrasound-treatment-on-the-properties-of-nano-emulsion-films-obtained-from-hazelnut-meal-protein-and-clove-essential-oil
#2
Osman Gul, Furkan Turker Saricaoglu, Aysegul Besir, Ilyas Atalar, Fehmi Yazici
Hazelnut meal protein (4% (w/v)) and clove essential oil (CEO) (3% (v/v)) were homogenized with ultrasound (US) at different times (2, 4 and 6 min) and amplitudes (50, 75 and 100%) to obtain nano-emulsion films. Film forming nano-emulsions (FFNs) were analyzed for average particle size (Dz) and zeta potential, and edible film characterization were evaluated depending on US treatment, as well as antibacterial and antioxidant activities. Dz values and zeta potential of FFNs decreased with increasing acoustic energy delivered to nano-emulsion system...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29113886/physico-mechanical-properties-of-gelatin-films-modified-with-lysine-arginine-and-histidine
#3
Junjie Lin, Ying Wang, Daodong Pan, Yangying Sun, Changrong Ou, Jinxuan Cao
The aim of this work was to evaluate the plasticizing effect of Lysine (Lys), Arginine (Arg) and Histidine (His) on gelatin films. Gelatin films incorporated with Lys, Arg and His at different levels (0, 0.5 and 1.0%) were prepared. The films without amino acids were prepared as controls. The addition of Lys increased the elongation at break (EAB) but decreased the tensile strength (TS) compared to the control, especially at 1.0% incorporated level. Arg had cross-linking effect on gelatin films through hydrogen bonds demonstrated by FTIR Analysis, which increased TS of the films...
November 4, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29111045/physical-properties-and-antioxidant-capacity-of-chitosan-epigallocatechin-3-gallate-films-reinforced-with-nano-bacterial-cellulose
#4
Xuejiao Wang, Yumei Xie, Hanjing Ge, Lin Chen, Jiali Wang, Shuang Zhang, Yan Guo, Zhixi Li, Xianchao Feng
Films with antioxidant activity were prepared by combining chitosan (CH) and epigallocatechin-3-gallate (EGCG) with nano-bacterial cellulose (BC) as a reinforcement agent. Results showed that BC addition improved the qualities of films jeopardized by EGCG. Fourier Transform Infrared (FTIR) spectroscopy analysis confirmed that there were intermolecular interactions among BC, CH and EGCG though hydrogen bonding. Consequently, BC addition increased the crystallinity and thermal stability of CH-BC5/10-EGCG15/30 films analyzed by X-ray diffraction (XRD) and thermogravimetric (TGA) analysis...
January 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29075473/climate-variation-alters-the-synchrony-of-host-parasitoid-interactions
#5
Miles T Wetherington, David E Jennings, Paula M Shrewsbury, Jian J Duan
Observed changes in mean temperature and increased frequency of extreme climate events have already impacted the distributions and phenologies of various organisms, including insects. Although some research has examined how parasitoids will respond to colder temperatures or experimental warming, we know relatively little about how increased variation in temperature and humidity could affect interactions between parasitoids and their hosts. Using a study system consisting of emerald ash borer (EAB), Agrilus planipennis, and its egg parasitoid Oobius agrili, we conducted environmentally controlled laboratory experiments to investigate how increased seasonal climate variation affected the synchrony of host-parasitoid interactions...
October 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29053677/building-double-decker-traps-for-early-detection-of-emerald-ash-borer
#6
Deborah G McCullough, Therese M Poland
Emerald ash borer (EAB) (Agrilus planipennis Fairmaire), the most destructive forest insect to have invaded North America, has killed hundreds of millions of forest and landscape ash (Fraxinus spp.) trees. Several artificial trap designs to attract and capture EAB beetles have been developed to detect, delineate, and monitor infestations. Double-decker (DD) traps consist of two corrugated plastic prisms, one green and one purple, attached to a 3 m tall polyvinyl chloride (PVC) pipe supported by a t-post. The green prism at the top of the PVC pipe is baited with cis-3-hexenol, a compound produced by ash foliage...
October 4, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29017395/electrical-support-during-outdoor-cycling-in-patients-with-coronary-artery-disease-impact-on-exercise-intensity-volume-and-perception-of-effort
#7
Dominique Hansen, An Soors, Valerie Deluyker, Ines Frederix, Paul Dendale
BACKGROUND: Electrical assisted bicycles (EAB's) could be used to overcome barriers and difficulties to outdoor cycling and thus assist in achieving a sufficient physical activity level in coronary artery disease (CAD) patients, but it is unknown whether sufficient exercise intensities and volumes could be elicited during cycling on EAB's. In this study we examined, for the first time, the acute physiological impact of electrical support during outdoor cycling in CAD patients (ISRCTN32238279)...
October 10, 2017: Acta Cardiologica
https://www.readbyqxmd.com/read/28980312/neural-stem-progenitor-cells-are-activated-during-tail-regeneration-in-the-leopard-gecko-eublepharis-macularius
#8
Eab Gilbert, M K Vickaryous
As for many lizards, the leopard gecko (Eublepharis macularius) can self-detach its tail to avoid predation and then regenerate a replacement. The replacement tail includes a regenerated spinal cord with a simple morphology: an ependymal layer surrounded by nerve tracts. We hypothesized that cells within the ependymal layer of the original spinal cord include populations of neural stem/progenitor cells (NSPCs) that contribute to the regenerated spinal cord. Prior to tail loss, we performed a bromodeoxyuridine pulse-chase experiment and found that a subset of ependymal layer cells (ELCs) were label-retaining after a 140-day chase period...
October 4, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28903607/candida-endocarditis-systematic-literature-review-from-1997-to-2014-and-analysis-of-29-cases-from-the-italian-study-of-endocarditis
#9
Simone Giuliano, Maurizio Guastalegname, Alessandro Russo, Marco Falcone, Veronica Ravasio, Marco Rizzi, Matteo Bassetti, Pierluigi Viale, Maria Bruna Pasticci, Emanuele Durante-Mangoni, Mario Venditti
Candida Endocarditis (CE) is a deadly disease. It is of paramount importance to assess risk factors for acquisition of both Candida native (NVE) and prosthetic (PVE) valve endocarditis and relate clinical features and treatment strategies with the outcome of the disease. Areas covered: We searched the literature using the Pubmed database. Cases of CE from the Italian Study on Endocarditis (SEI) were also included. Overall, 140 cases of CE were analyzed. Patients with a history of abdominal surgery and antibiotic exposure had higher probability of developing NVE than PVE...
September 14, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/28866443/subminimal-inhibitory-concentration-sub-mic-of-antibiotic-induces-electroactive-biofilm-formation-in-bioelectrochemical-systems
#10
Lean Zhou, Tian Li, Jingkun An, Chengmei Liao, Nan Li, Xin Wang
Electroactive biofilms (EABs) generated from mixed inocula are attractive due to their unique direct extracellular electron transfer abilities and potential use in water pollution control. In this study, for the first time, we identified a chemical that can be used for EAB regulation (both inhibition and promotion). We confirmed that tobramycin, an antibiotic previously demonstrated to inhibit the activity of EABs, is an agonist of EAB formation at subminimal inhibitory concentrations (sub-MICs). Compared to the control, at tobramycin concentrations of 0...
November 15, 2017: Water Research
https://www.readbyqxmd.com/read/28799331/flexible-sic-si3n4-composite-nanofibers-with-in-situ-embedded-graphite-for-highly-efficient-electromagnetic-wave-absorption
#11
Peng Wang, Laifei Cheng, Yani Zhang, Litong Zhang
SiC/Si3N4 composite nanofibers with in situ embedded graphite, which show highly efficient electromagnetic (EM) wave absorption performance in gigahertz frequency, were prepared by electrospinning with subsequent polymer pyrolysis and annealing. By means of incorporating graphite and Si3N4 into SiC, the EM wave absorption properties of the nanofibers were improved. The relationship among processing, fiber microstructure, and their superior EM wave absorption performance was systematically investigated. The EM wave absorption capability and effective absorption bandwidth (EAB) of nanofibers can be simply controlled by adjusting annealing atmosphere and temperature...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28752407/variation-in-the-volatile-profiles-of-black-and-manchurian-ash-in-relation-to-emerald-ash-borer-oviposition-preferences
#12
Chad M Rigsby, Nathaniel B McCartney, Daniel A Herms, James H Tumlinson, Don Cipollini
Emerald ash borer (EAB; Agrilus planipennis) is a devastating pest of ash (Fraxinus spp.) in its invaded range in North America. Its coevolved Asian hosts are more resistant and less preferred for oviposition than susceptible North American species. We compared EAB oviposition preferences and bark and canopy volatile organic compound (VOC) emissions of resistant Manchurian ash and susceptible black ash, and examined relationships between VOC profiles and oviposition. In the field, black ash was highly preferred for oviposition while no eggs were laid on Manchurian ash, and we found clear differences in the VOC profiles of Manchurian and black ash...
August 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28745865/electroactive-biofilms-for-sensing-reflections-and-perspectives
#13
Antonin Prévoteau, Korneel Rabaey
Microbial electrochemistry has from the onset been recognized for its sensing potential due to the microbial ability to enhance signals through metabolic cascades, its relative selectivity toward substrates, and the higher stability conferred by the microbial ability to self-replicate. The greatest challenge has been to achieve stable and efficient transduction between a microorganism and an electrode surface. Over the past decades, a new kind of microbial architecture has been observed to spontaneously develop on polarized electrodes: the electroactive biofilm (EAB)...
August 25, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28671824/exclusive-extracellular-bioreduction-of-methyl-orange-by-azo-reductase-free-geobacter-sulfurreducens
#14
Yi-Nan Liu, Feng Zhang, Jie Li, Dao-Bo Li, Dong-Feng Liu, Wen-Wei Li, Han-Qing Yu
Azo dyes are a class of recalcitrant organic pollutants causing severe environmental pollution. For their biodecolorization, the azo reductase system was considered as the major molecular basis in bacteria. However, the intracellular localization of azo reductase limits their function for efficient azo dye decolorization. This limitation may be circumvented by electrochemically active bacteria (EAB) which is capable of extracellular respiration. To verify the essential role of extracellular respiration in azo dye decolorization, Geobacter sulfurreducens PCA, a model EAB, was used for the bioreduction of methyl orange (MO), a typical azo dye...
July 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28647320/an-integrated-aerobic-anaerobic-strategy-for-performance-enhancement-of-pseudomonas-aeruginosa-inoculated-microbial-fuel-cell
#15
Xiao-Yu Yong, Zhi-Ying Yan, Hai-Bo Shen, Jun Zhou, Xia-Yuan Wu, Li-Juan Zhang, Tao Zheng, Min Jiang, Ping Wei, Hong-Hua Jia, Yang-Chun Yong
Microbial fuel cell (MFC) is a promising device for energy generation and organic waste treatment simultaneously by electrochemically active bacteria (EAB). In this study, an integrated aerobic-anaerobic strategy was developed to improve the performance of P. aeruginosa-inoculated MFC. With an aerobic start-up and following an anaerobic discharge process, the current density of MFC reached a maximum of 99.80µA/cm(2), which was 91.6% higher than the MFC with conventional constant-anaerobic operation. Cyclic voltammetry and HPLC analysis showed that aerobic start-up significantly increased electron shuttle (pyocyanin) production (76% higher than the constant-anaerobic MFC)...
October 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28638375/valorization-of-spent-escherichia-coli-media-using-green-microalgae-chlamydomonas-reinhardtii-and-feedstock-production
#16
Jian-Guo Zhang, Fang Zhang, Kiran Thakur, Fei Hu, Zhao-Jun Wei
The coupling of Chlamydomonas reinhardtii biomass production for nutrients removal of Escherichia coli anaerobic broth (EAB) is thought to be an economically feasible option for the cultivation of microalgae. The feasibility of growing microalgae in using EAB high in nutrients for the production of more biomass was examined. EAB comprised of nutrient-abundant effluents, which can be used to produce microalgae biomass and remove environment pollutant simultaneously. In this study, C. reinhardtii 21gr (cc1690) was cultivated in different diluted E...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28624619/quorum-sensing-signals-enhance-the-electrochemical-activity-and-energy-recovery-of-mixed-culture-electroactive-biofilms
#17
Shanshan Chen, Xianyue Jing, Jiahuan Tang, Yanlun Fang, Shungui Zhou
The impacts of exogenous or endogenous quorum sensing (QS) signaling molecules on mixed-culture electroactive biofilms (EABs), especially extracellular polymeric substances (EPS) and exoelectrogens using direct electron transfer mechanism inside EABs are poorly understood. This research focuses on the influence of acylhomoserine lactones (AHLs), the most common QS signaling molecules for gram negative bacteria, on mixed-culture EABs. Results indicated that both exogenous and endogenous AHLs played the role as regulators to improve the electrochemical activities of EABs...
June 13, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28619638/development-and-characterization-of-cuttlefish-sepia-officinalis-skin-gelatin-protein-isolate-blend-films
#18
Hela Kchaou, Mourad Jridi, Ola Abdelhedi, Benbettaïeb Nasreddine, Thomas Karbowiak, Moncef Nasri, Frédéric Debeaufort
In the present study, cuttlefish skin gelatin (CSG) and protein isolate (CSPI) blend films were prepared and their physicochemical and antioxidant properties were characterized. CSG (4%, w/v) was blended with CSPI (3%, w/v) at different ratios and 15% of glycerol (w/w, plasticizer/polymer dry matter). Results showed that increasing of CSPI content induced lower lightness but higher redness, yellowness and color difference values compared to CSG film. In addition, CSPI film had the lowest tensile strength (TS) and elongation at break (EAB) values...
June 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28594183/the-opposite-effect-of-water-and-n-methyl-2-pyrrolidone-cosolvents-on-the-nanostructural-organization-of-ethylammonium-butanoate-ionic-liquid-a-small-and-wide-angle-x-ray-scattering-and-molecular-dynamics-simulations-study
#19
Umme Salma, Natalia V Plechkova, Ruggero Caminiti, Lorenzo Gontrani
Two series of mixtures of ethylammoniumbutanoate (EAB, [N0 0 0 2][C3CO2]) in water and N-methyl-2-pyrrolidone (NMP) have been prepared at different molar fractions to assess the effect of these two polar solvents on the nanostructural order present in [N0 0 0 2][C3CO2]. The small- and wide-angle X-ray scattering (SWAXS) pattern of the liquid in neat state shows a prepeak at Q = 0.513 Å(-1), which is associated with the aggregation of nonpolar alkyl chains of both cations and anions. Interestingly, the two solvents affect the nanostructure of [N0 0 0 2][C3CO2] differently, though both are polar...
June 26, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28571278/applicability-of-the-cielab-and-ciede2000-formulae-for-detection-of-colour-changes-in-colour-changeable-chewing-gum-for-evaluating-masticatory-function
#20
Yesiboli Yeerken, Takafumi Otomaru, Mohamed Said, Na Li, Hisashi Taniguchi
INTRODUCTION: Mastication is one of the essential stomatognathic functions and is impaired when mandibulectomy is performed for removal of head and neck lesions. AIM: The purpose of this study was to investigate the correlation between perceived chewing ability {Masticatory Score (MS)} and objective mixing ability (∆E) in patients who had undergone marginal mandibulectomy. MATERIALS AND METHODS: Twenty normal dentate subjects as control group and twenty mandibulectomy patients who had undergone marginal mandibulectomy and wearing a dentomaxillary prosthesis were enrolled...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
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