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https://www.readbyqxmd.com/read/28106837/a-distributed-and-energy-efficient-algorithm-for-event-k-coverage-in-underwater-sensor-networks
#1
Peng Jiang, Yiming Xu, Jun Liu
For event dynamic K-coverage algorithms, each management node selects its assistant node by using a greedy algorithm without considering the residual energy and situations in which a node is selected by several events. This approach affects network energy consumption and balance. Therefore, this study proposes a distributed and energy-efficient event K-coverage algorithm (DEEKA). After the network achieves 1-coverage, the nodes that detect the same event compete for the event management node with the number of candidate nodes and the average residual energy, as well as the distance to the event...
January 19, 2017: Sensors
https://www.readbyqxmd.com/read/28105609/effect-of-zinc-and-copper-nanoparticles-on-drought-resistance-of-wheat-seedlings
#2
Nataliya Taran, Volodymyr Storozhenko, Nataliia Svietlova, Ludmila Batsmanova, Viktor Shvartau, Mariia Kovalenko
The effect of a colloidal solution of Cu,Zn-nanoparticles on pro-oxidative/antioxidative balance and content of photosynthetic pigments and leaf area of winter wheat plants of steppe (Acveduc) and forest-steppe (Stolichna) ecotypes was investigated in drought conditions. It has been shown that Cu,Zn-nanoparticles decreased the negative effect of drought action upon plants of steppe ecotype Acveduc. In particular, increased activity of antioxidative enzymes reduced the level of accumulation of thiobarbituric acid reactive substances (TBARS) and stabilized the content of photosynthetic pigments and increased relative water content in leaves...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28105604/influence-of-working-temperature-on-the-formation-of-electrospun-polymer-nanofibers
#3
Guang-Zhi Yang, Hai-Peng Li, Jun-He Yang, Jia Wan, Deng-Guang Yu
Temperature is an important parameter during electrospinning, and virtually, all solution electrospinning processes are conducted at ambient temperature. Nanofiber diameters presumably decrease with the elevation of working fluid temperature. The present study investigated the influence of temperature variations on the formation of polymeric nanofibers during single-fluid electrospinning. The surface tension and viscosity of the fluid decreased with increasing working temperature, which led to the formation of high-quality nanofibers...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28105603/resuscitation-fluid-composition-affects-hepatic-inflammation-in-a-murine-model-of-early-sepsis
#4
Amanda L Patrick, Peter M Grin, Nicole Kraus, Michelle Gold, Matthew Berardocco, Patricia C Liaw, Alison E Fox-Robichaud
BACKGROUND: Fluid resuscitation is a crucial therapy for sepsis, and the use of balanced fluids and/or isotonic albumin may improve patient survival. We have previously demonstrated that resuscitation with normal saline results in increased hepatic leukocyte recruitment in a murine model of sepsis. Given that clinical formulations of albumin are in saline, our objectives were to develop a novel balanced electrolyte solution specifically for sepsis and to determine if supplementing this solution with albumin would improve the inflammatory response in sepsis...
December 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28102958/sliding-window-prior-data-assisted-compressed-sensing-for-mri-tracking-of-lung-tumors
#5
Eugene Yip, Jihyun Yun, Keith Wachowicz, Zsolt Gabos, Satyapal Rathee, B G Fallone
PURPOSE: Hybrid magnetic resonance imaging and radiation therapy devices are capable of imaging in real-time to track intrafractional lung tumor motion during radiotherapy. Highly accelerated magnetic resonance (MR) imaging methods can potentially reduce system delay time and/or improves imaging spatial resolution, and provide flexibility in imaging parameters. Prior Data Assisted Compressed Sensing (PDACS) has previously been proposed as an acceleration method that combines the advantages of 2D compressed sensing and the KEYHOLE view-sharing technique...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28099643/balanced-crystalloids-for-septic-shock-resuscitation
#6
Thiago Domingos Corrêa, Alexandre Biasi Cavalcanti, Murillo Santucci Cesar de Assunção
Timely fluid administration is crucial to maintain tissue perfusion in septic shock patients. However, the question concerning which fluid should be used for septic shock resuscitation remains a matter of debate. A growing body of evidence suggests that the type, amount and timing of fluid administration during the course of sepsis may affect patient outcomes. Crystalloids have been recommended as the first-line fluids for septic shock resuscitation. Nevertheless, given the inconclusive nature of the available literature, no definitive recommendations about the most appropriate crystalloid solution can be made...
October 2016: Revista Brasileira de Terapia Intensiva
https://www.readbyqxmd.com/read/28098975/development-of-spiro-cyclopenta-1-2-b-5-4-b-dithiophene-4-9-fluorene-based-a-%C3%AF-d-%C3%AF-a-small-molecules-with-different-acceptor-units-for-efficient-organic-solar-cells
#7
Wengong Wang, Ping Shen, Xinning Dong, Chao Weng, Guo Wang, Haijun Bin, Jing Zhang, Zhi-Guo Zhang, Yongfang Li
Three acceptor-π-donor-π-acceptor (A-π-D-π-A) small molecules (STFYT, STFRDN, and STFRCN) with spiro[cyclopenta[1,2-b:5,4-b']dithiophene-4,9'-fluorene] (STF) as the central donor unit, terthiophene as the π-conjugated bridge, indenedione, 3-ethylrhodanine, or 2-(1,1-dicyanomethylene)rhodanine as the acceptor unit are designed, synthesized and characterized as electron donor materials in solution-processing organic solar cells (OSCs). The effects of the spiro STF-based central core and different acceptors on the molecular configuration, absorption properties, electronic energy levels, carrier transport properties, the morphology of active layers, and photovoltaic properties are investigated in detail...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098738/subretinal-cell-based-therapy-an-analysis-of-surgical-variables-to-increase-cell-survival
#8
David J Wilson, Martha Neuringer, Jonathan Stoddard, Lauren M Renner, Steven Bailey, Andreas Lauer, Trevor J McGill
PURPOSE: To develop a novel surgical approach to provide consistent delivery of cell suspension into the subretinal space without cell leakage into the vitreous. METHODS: Cell viability was assessed following mock injections to determine the optimal size cannula for delivery of the cells. A pars plana without vitrectomy approach was used to create a subretinal bleb with balanced salt solution using a 41-gauge cannula. GFP-labeled retinal pigment epithelium cells were injected through transretinal (n = 8) and transscleral (n = 16) injection approaches...
January 16, 2017: Retina
https://www.readbyqxmd.com/read/28093906/floating-and-sinking-of-a-pair-of-spheres-at-a-liquid-fluid-interface
#9
Himantha Cooray, Pietro Cicuta, Dominic Vella
Spheres floating at liquid--fluid interfaces cause interfacial deformations such that their weight is balanced by the resultant forces of surface tension and hydrostatic pressure, whilst also satisfying a contact angle condition. Determining the meniscus shape around several floating spheres is a complicated problem because the vertical locations of the spheres and the horizontal projections of the three--phase contact lines are not known a priori. Here, a new computational algorithm is developed to simultaneously satisfy the nonlinear Laplace--Young equation for the meniscus shape, the vertical force balance, and the geometric properties of the spheres...
January 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28092588/a-many-objective-evolutionary-algorithm-using-a-one-by-one-selection-strategy
#10
Yiping Liu, Dunwei Gong, Jing Sun, Yaochu Jin
Most existing multiobjective evolutionary algorithms experience difficulties in solving many-objective optimization problems due to their incapability to balance convergence and diversity in the high-dimensional objective space. In this paper, we propose a novel many-objective evolutionary algorithm using a one-by-one selection strategy. The main idea is that in the environmental selection, offspring individuals are selected one by one based on a computationally efficient convergence indicator to increase the selection pressure toward the Pareto optimal front...
January 9, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28092550/-l_0-gradient-projection
#11
Shunsuke Ono
Minimizing L0 gradient, the number of the nonzero gradients of an image, together with a quadratic datafidelity to an input image has been recognized as a powerful edge-preserving filtering method. However, the L0 gradient minimization has an inherent difficulty: a user-given parameter controlling the degree of flatness does not have a physical meaning since the parameter just balances the relative importance of the L0 gradient term to the quadratic data-fidelity term. As a result, the setting of the parameter is a troublesome work in the L0 gradient minimization...
January 11, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28092496/the-effect-of-contrast-material-on-radiation-dose-at-ct-part-i-incorporation-of-contrast-material-dynamics-in-anthropomorphic-phantoms
#12
Pooyan Sahbaee, W Paul Segars, Daniele Marin, Rendon C Nelson, Ehsan Samei
Purpose To develop a method to incorporate the propagation of contrast material into computational anthropomorphic phantoms for estimation of organ dose at computed tomography (CT). Materials and Methods A patient-specific physiologically based pharmacokinetic (PBPK) model of the human cardiovascular system was incorporated into 58 extended cardiac-torso (XCAT) patient phantoms. The PBPK model comprised compartmental models of vessels and organs unique to each XCAT model. For typical injection protocols, the dynamics of the contrast material in the body were described according to a series of patient-specific iodine mass-balance differential equations, the solutions to which provided the contrast material concentration time curves for each compartment...
January 13, 2017: Radiology
https://www.readbyqxmd.com/read/28092314/novel-technique-for-subretinal-fluid-drainage-with-chandelier-assisted-scleral-buckle-surgery-cannula-controlled-drainage
#13
Abdulelah A Al-Abdullah
PURPOSE: To report a novel technique for subretinal fluid drainage in scleral buckle surgery. METHODS: A 26-gauge intravenous cannula with its needle was used to puncture the sclera; then, the needle (metallic part) was withdrawn to further introduce the cannula into the subretinal space. In addition, we describe using the 25-gauge microcannula of the chandelier light to inject the balanced salt solution to help restore the intraocular pressure and push the subretinal fluid through the intravenous cannula under direct visualization...
January 13, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28081159/osmoregulation-in-the-halophilic-bacterium-halomonas-elongata-a-case-study-for-integrative-systems-biology
#14
Viktoria Kindzierski, Silvia Raschke, Nicole Knabe, Frank Siedler, Beatrix Scheffer, Katharina Pflüger-Grau, Friedhelm Pfeiffer, Dieter Oesterhelt, Alberto Marin-Sanguino, Hans-Jörg Kunte
Halophilic bacteria use a variety of osmoregulatory methods, such as the accumulation of one or more compatible solutes. The wide diversity of compounds that can act as compatible solute complicates the task of understanding the different strategies that halophilic bacteria use to cope with salt. This is specially challenging when attempting to go beyond the pathway that produces a certain compatible solute towards an understanding of how the metabolic network as a whole addresses the problem. Metabolic reconstruction based on genomic data together with Flux Balance Analysis (FBA) is a promising tool to gain insight into this problem...
2017: PloS One
https://www.readbyqxmd.com/read/28079355/self-assembled-architectures-of-alkynylplatinum-ii-amphiphiles-and-their-structural-optimization-a-balance-of-the-interplay-among-pt%C3%A2-%C3%A2-%C3%A2-pt-%C3%AF-%C3%AF-stacking-and-hydrophobic-hydrophobic-interactions
#15
Heidi Li-Ki Fu, Charlotte Po, Sammual Yu-Lut Leung, Vivian Wing-Wah Yam
A series of alkynylplatinum(II) terpyridine complexes with triethylene glycol units was synthesized, and their self-assembly properties were investigated in solution by UV-vis absorption, emission, and (1)H NMR spectroscopy. The aggregation behaviors of several water-soluble complexes were investigated in aqueous media. Some of them were found to give rise to uniform fibers, suggesting the important role that triethylene glycol units has in regulating their self-assembly properties. Further modifications of these structures through the incorporation of alkyl chains and changes in counter-anions have rendered the complexes more amphiphilic in nature, and the effect of their alkyl chain lengths was studied and optimized...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079284/controlling-the-helix-handedness-of-%C3%AE-%C3%AE-%C3%AE-peptide-foldamers-through-sequence-shifting
#16
Monika Szefczyk, Ewelina Węglarz-Tomczak, Paulina Fortuna, Agnieszka Krzysztoń, Ewa Rudzińska-Szostak, Łukasz Berlicki
Peptide foldamers containing both cis-β-aminocyclopentanecarboxylic acid and α-amino acid residues combined in various sequence patterns (ααβ, αααβ, αβααβ, and ααβαααβ) were screened using CD and NMR spectroscopy for the tendency to form helices. ααβ-Peptides were found to fold into an unprecedented and well-defined 16/17/15/18/14/17-helix. By extending the length of the sequence or shifting a fragment of the sequence from one terminus to another in ααβ-peptides, the balance between left-handed and right-handed helix populations present in the solution can be controlled...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28078858/use-of-lactated-ringer%C3%A2-s-solution-does-not-eliminate-the-risk-of-strong-ion-difference-related-metabolic-acidosis-following-on-pump-cardiac-surgery
#17
T Jovaisa, V Vicka, G Linkaitė, J Guseinovaitė, D Ringaitienė, I Norkienė
There is a growing interest in the effects of plasma sodium levels on postoperative outcomes. A trend of using balanced crystalloid solutions is based on the extensive data on chloride and the strong ion difference-related acidosis. However, effects of sodium are often overlooked in this context. The aim of the study was to establish the effects of the routine use of Lactated Ringer’s Solution (RL) on postoperative changes in sodium concentrations and whether these changes result in metabolic acidosis. We performed database analysis of 358 consecutive elective on-pump cardiac surgery cases in a tertiary referral university hospital...
October 2016: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28078649/acidogenic-digestion-of-pre-pulping-extracts-for-production-of-fuels-and-bioproducts-via-carboxylate-platform-processing
#18
Rakhi Baddam, G Peter van Walsum
Hemicellulose extracted from wood prior to processing the wood into paper or composite materials can be a resource for the production of biofuels or bioproducts. Mixed microbial cultures are capable of converting biomass into mixed carboxylic acids, which can be purified as products or converted to biofuels or other biochemicals. Mixed cultures are robust conversion systems and do not require added enzymes to hydrolyze biomass to sugars. We produced mixed carboxylic acids using mesophilic and thermophilic fermentation of raw, unconditioned green liquor and hot water hardwood extracts, as well as baseline sugar solutions...
January 11, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28078522/long-term-impact-of-reduced-tillage-on-water-and-pesticide-flow-in-a-drained-context
#19
R Dairon, A Dutertre, J Tournebize, J Marks-Perreau, N Carluer
Influence of more than 20 years (1988-2010) of reduced tillage (RT) practices on water and pesticide balances and dynamics is analyzed and compared to results from a conventional tillage plot (CT). The field study soils are described as silty clay stagnic luvisol, developed on a low permeable schist layer. A drainage network was set up according to French criteria (0.9 m deep, 10 m space) to avoid soil winter waterlogging. Climate is temperate oceanic and drainage generally occurs from November to March...
January 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28077541/the-role-of-bicarbonate-precursors-in-balanced-fluids-during-haemorrhagic-shock-with-and-without-compromised-liver-function
#20
B Ergin, A Kapucu, P Guerci, C Ince
BACKGROUND: Lactate, acetate, and gluconate are anions used in balanced resuscitation fluids, of which lactate and acetate are considered bicarbonate precursors. This study investigated the role of the liver in the ability of balanced and unbalanced solutions to correct acid-base alterations and renal haemodynamics and microvascular oxygenation in a rat model of resuscitated haemorrhagic shock. METHODS: Ringer's lactate, Ringer's acetate, PlasmaLyte, or normal saline were administered following haemorrhagic shock in the presence or absence of a 70% partial liver resection...
October 2016: British Journal of Anaesthesia
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