keyword
MENU ▼
Read by QxMD icon Read
search

Simulator

keyword
https://www.readbyqxmd.com/read/28535593/simulating-soil-organic-carbon-stock-as-affected-by-land-cover-change-and-climate-change-hyrcanian-forests-northern-iran
#1
Azam Soleimani, Seyed Mohsen Hosseini, Ali Reza Massah Bavani, Mostafa Jafari, Rosa Francaviglia
Soil organic carbon (SOC) contains a considerable portion of the world's terrestrial carbon stock, and is affected by changes in land cover and climate. SOC modeling is a useful approach to assess the impact of land use, land use change and climate change on carbon (C) sequestration. This study aimed to: (i) test the performance of RothC model using data measured from different land covers in Hyrcanian forests (northern Iran); and (ii) predict changes in SOC under different climate change scenarios that may occur in the future...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28535530/mathematical-model-of-potassium-profiling-in-chronic-dialysis
#2
Mauro Ursino, Gabriele Donati
Potassium balance is a difficult task in hemodialysis: low potassium in the dialysate is associated with a high risk of sudden cardiac death, whereas excessive dialysate potassium may provoke insufficient removal and hyperkalemia. A better understanding of the problem can be achieved with the use of mathematical models of solute kinetics. This study is aimed at presenting an improved model of solute kinetics and fluid shifts during hemodialysis. It comprises a 2-compartment (intracellular and extracellular) description of sodium, potassium, and urea, including volume fluid shifts induced by osmotic forces...
2017: Contributions to Nephrology
https://www.readbyqxmd.com/read/28535491/efficient-bioconversion-of-high-content-volatile-fatty-acids-into-microbial-lipids-by-cryptococcus-curvatus-atcc-20509
#3
Jia'nan Liu, Xiangfeng Huang, Rui Chen, Ming Yuan, Jia Liu
The lower utilization ratios of high-content VFAs resulted in less lipid yield by the oleaginous yeast Cryptococcus curvatus ATCC 20509. In this work, increasing the inoculation concentration to OD600=5.1 improved the acetic acid utilization ratio (99.8%) and lipids production (4.63g/L) in mediums with 30g/L of acetic acid. For the higher acetic acid concentration (40g/L), increasing the nitrogen to carbon ratio (0.033) and raising the initial pH (pH=8) was superior over improvement in the inoculate, with the lipid production increased from 1...
April 21, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28535478/the-effect-of-billboard-design-specifications-on-driving-a-pilot-study
#4
Hadas Marciano, Pe'erly Setter
Decades of research on the effects of advertising billboards on road accident rates, driver performance, and driver visual scanning behavior, has produced no conclusive findings. We suggest that road safety researchers should shift their focus and attempt to identify the billboard characteristics that are most distracting to drivers. This line of research may produce concrete guidelines for permissible billboards that would be likely to reduce the influence of the billboards on road safety. The current study is a first step towards this end...
May 20, 2017: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/28535444/passive-detection-of-pb-in-water-using-rock-phosphate-agarose-beads
#5
Harry M Edenborn, Bret H Howard, James I Sams, Dorothy J Vesper, Sherie L Edenborn
In this study, passive detectors for Pb were prepared by immobilizing powdered rock phosphate in agarose beads. Rock phosphate has been used to treat Pb-contaminated waters and soil by fixing the metal as an insoluble pyromorphite mineral. Under lab conditions, Pb was rapidly adsorbed from aqueous solution by the beads over time, consistent with the acidic dissolution of rock phosphate, the precipitation of pyromorphite within the pore space of the agarose gel matrix, and surface exchange reactions. Net accumulation of Pb occurred when beads were exposed to simulated periodic releases of Pb over time...
April 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28535410/effect-of-enzyme-inhibition-on-perampanel-pharmacokinetics-why-study-design-matters
#6
Barry E Gidal, Rama Maganti, Antonio Laurenza, Haichen Yang, David A Verbel, Edgar Schuck, Jim Ferry
OBJECTIVES: Perampanel, a selective, noncompetitive AMPA receptor antagonist, is indicated as adjunctive therapy for the treatment of partial seizures with or without secondarily generalized seizures and primary generalized tonic-clonic seizures in patients with epilepsy aged 12years and older. In vitro studies and Phase I trials indicate that perampanel is metabolized almost exclusively by CYP3A, with an elimination half-life (t1/2) averaging approximately 105h. Understanding of pharmacokinetic (PK) interactions-enzyme inhibition or induction-and anticipating their occurrence are important for management of patients with epilepsy...
April 26, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28535355/effect-of-composition-asymmetry-on-the-phase-separation-and-crystallization-in-double-crystalline-binary-polymer-blends-a-dynamic-monte-carlo-simulation-study
#7
Ashok Kumar Dasmahapatra
Polymer blends offer an exciting material for various potential applications due to their tunable properties by varying constituting components and their relative composition. Our simulation results unravel an intrinsic relationship between crystallization behavior and composition asymmetry. We report simulation results for non-isothermal and isothermal crystallization with weak and strong segregation strength to elucidate the composition dependent crystallization behavior. With increasing composition of low melting B-polymer, macrophase separation temperature changes non-monotonically, which is attributed to the non-monotonic change in diffusivity of both the polymers...
May 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28535349/solitary-oxygen-dopant-emission-from-carbon-nanotubes-modified-by-dielectric-metasurfaces
#8
Xuedan Ma, Anthony R James, Nicolai F Hartmann, Jon K Baldwin, Jason Dominguez, Michael B Sinclair, Ting S Luk, Omri Wolf, Sheng Liu, Stephen K Doorn, Han Htoon, Igal Brener
All-dielectric metasurfaces made from arrays of high index nanoresonators supporting strong magnetic dipole modes have emerged as a low-loss alternative to plasmonic metasurfaces. Here we use oxygen-doped single-walled carbon nanotubes (SWCNTs) as quantum emitters and couple them to silicon metasurfaces to study effects of the magnetic dipole modes of the constituent nanoresonators on the photoluminescence (PL) of individual SWCNTs. We find that when in resonance, the magnetic mode of the silicon nanoresonators can lead to a moderate average PL enhancement of 0...
May 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28535348/coarse-grained-modeling-of-polyethylene-melts-effect-on-dynamics
#9
Brandon L Peters, K Michael Salerno, Anupriya Agrawal, Dvora Perahia, Gary S Grest
The distinctive viscoelastic behavior of polymers results from a coupled interplay of motion on multiple length and time scales. Capturing the broad time and length scales of polymer motion remains a challenge. Using polyethylene (PE) as a model macromolecule, we construct coarse-grained (CG) models of PE with 3-6 methyl groups per CG bead and probe two critical aspects of the technique: pressure corrections required after iterative Boltzmann inversion (IBI) to generate CG potentials that match the pressure of reference fully-atomistic melt simulations and the transferability of CG potentials across temperatures...
May 23, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28535346/on-the-optimization-of-current-injection-in-algainp-core-shell-nanowire-light-emitting-diodes
#10
Pyry Kivisaari, Alexander Berg, Mohammad Karimi, Kristian Storm, Steven Limpert, Jani Oksanen, Lars Samuelson, Håkan Jan Pettersson, Magnus T Borgström
Core-shell nanowires offer great potential to enhance the efficiency of light-emitting diodes (LEDs) and expand the attainable wavelength range of LEDs over the whole visible spectrum. Additionally, nanowire LEDs can offer both improved light extraction and emission enhancement if the diameter of the wires is not larger than half the emission wavelength (λ/2). However, AlGaInP nanowire LEDs have so far failed to match the high efficiencies of traditional planar technologies, and the parameters limiting the efficiency remain unidentified...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28535343/tuning-adsorption-duration-to-control-the-diffusion-of-a-nanoparticle-in-adsorbing-polymers
#11
Xuezheng Cao, Holger Merlitz, Chen-Xu Wu
Controlling the nanoparticle (NP) diffusion in polymers is a prerequisite to obtain polymer nanocomposites (PNCs) with desired dynamical and rheological properties, and to achieve targeted delivery of nanomedicine in biological systems. Here we determinate the suppression mechanism of direct NP-polymer attraction to hamper the NP mobility in adsorbing polymers, and then quantify the dependence of the effective viscosity \eta_{eff} felt by the NP on the adsorption duration \tau_{ads} of polymers on the NP, using scaling theory analysis and molecular dynamics (MD) simulations...
May 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28535342/diffusion-under-confinement-hydrodynamic-finite-size-effects-in-simulation
#12
Pauline Simonnin, Benoit Noetinger, Carlos Nieto Draghi, Virginie Marry, Benjamin Rotenberg
We investigate finite-size effects on diffusion in confined fluids using molecular dynamics simulations and hydrodynamic calculations. Specifically, we consider a Lennard-Jones fluid in slit pores without slip at the interface and show that the use of periodic boundary conditions in the directions along the surfaces results in dramatic finite-size effects, in addition to that of the physically relevant confining length. As in the simulation of bulk fluids, these effects arise from spurious hydrodynamic interactions between periodic images and from the constraint of total momentum conservation...
May 23, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28535339/ecophysiological-examination-of-the-lake-erie-microcystis-bloom-in-2014-linkages-between-biology-and-the-water-supply-shutdown-of-toledo-ohio
#13
Morgan Michelle Steffen, Timothy W Davis, Robert Michael McKay, George S Bullerjahn, Lauren E Krausfeldt, Joshua M A Stough, Michelle L Neitzey, Naomi E Gilbert, Gregory L Boyer, Thomas H Johengen, Duane C Gossiaux, Ashley M Burtner, Danna Palladino, Mark Rowe, Gregory J Dick, Kevin Meyer, Shawn Levy, Braden Boone, Richard Stumpf, Timothy Wynne, Paul V Zimba, Danielle B Gutierrez, Steven W Wilhelm
Annual cyanobacterial blooms dominated by Microcystis have occurred in western Lake Erie (USA/Canada) during summer months since 1995. The production of toxins by bloom-forming cyanobacteria can lead to drinking water crises, such as the one experienced by the city of Toledo in August of 2014, when the city was rendered without drinking water for > 2 days. It is important to understand the conditions and environmental cues that were driving this specific bloom to provide a scientific framework for management of future bloom events...
May 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28535320/effectiveness-of-a-labor-cervical-exam-model-in-family-medicine-and-ob-gyn-residents
#14
Joshua F Nitsche, Nora F Fino, Jose M Palomo, Abraham Portillo Perdomo, Brian C Brost
BACKGROUND AND OBJECTIVES: Labor cervical exam accuracy is an essential skill for family medicine and OB-GYN residents to master. To determine the effectiveness of simulation on labor cervical exam training, family medicine and OB-GYN residents were trained using a self-constructed PVC pipe-based cervical exam model during a short and intensive simulation workshop or "boot camp." METHODS: A task trainer was constructed that allows for the blind examination of cervical dilation and effacement...
May 2017: Family Medicine
https://www.readbyqxmd.com/read/28535263/gene-expression-variability-and-the-analysis-of-large-scale-rna-seq-studies-with-the-mdseq
#15
Di Ran, Z John Daye
Rapidly decreasing cost of next-generation sequencing has led to the recent availability of large-scale RNA-seq data, that empowers the analysis of gene expression variability, in addition to gene expression means. In this paper, we present the MDSeq, based on the coefficient of dispersion, to provide robust and computationally efficient analysis of both gene expression means and variability on RNA-seq counts. The MDSeq utilizes a novel reparametrization of the negative binomial to provide flexible generalized linear models (GLMs) on both the mean and dispersion...
May 23, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28535197/feeding-and-development-of-emerald-ash-borer-coleoptera-buprestidae-on-cultivated-olive-olea-europaea
#16
Don Cipollini, Chad M Rigsby, Donnie L Peterson
We examined the suitability of cultivated olive, Olea europaea L., as a host for emerald ash borer, Agrilus planipennis Fairmaire. In a bioassay using cut stems from a field-grown olive tree (cv. 'Manzanilla') we found that 45% of larvae that had emerged from eggs used to inoculate stems, were recovered alive, many as larvae or prepupae, during periodic debarking of a subset of stems. Three intact stems that 19 larvae successfully entered were exposed to a simulated overwintering treatment. Four live adults emerged afterwards, and an additional pupa and several prepupae were discovered after debarking these stems...
May 23, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28535162/examining-the-social-context-of-injection-drug-use-social-proximity-vs-geographic-proximity-to-others-who-inject-drugs
#17
Abby E Rudolph, April M Young, Jennifer R Havens
This analysis uses social network and spatial data to examine associations between one's injection status and social and/or spatial proximity to others who inject. 503 rural persons who use drugs were recruited to participate in the Social Networks among Appalachian People (SNAP) Study (2008-2010). Interviewer-administered surveys collected information on recent sex, drug use, and social support network members (n = 897 ties). Using network simulations, we determined a threshold for the association between social proximity to others who inject and recent injection status ('socially proximal' defined by shortest path≤2)...
May 23, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28535149/quantitative-computational-models-of-molecular-self-assembly-in-systems-biology
#18
Marcus Thomas, Russell Schwartz
Molecular self-assembly is the dominant form of chemical reaction in living systems, yet efforts at systems biology modeling are only beginning to appreciate the need for and challenges to accurate quantitative modeling of self-assembly. Self-assembly reactions are essential to nearly every important process in cell and molecular biology and handling them is thus a necessary step in building comprehensive models of complex cellular systems. They present exceptional challenges, however, to standard methods for simulating complex systems...
May 23, 2017: Physical Biology
https://www.readbyqxmd.com/read/28535146/role-of-spatial-inhomogenity-in-gpcr-dimerisation-predicted-by-receptor-association-diffusion-models
#19
Sneha A Deshpande, Aiswarya B Pawar, Anish Dighe, Chaitanya A Athale, Durba Sengupta
G protein-coupled receptor (GPCR) association is an emerging paradigm with far reaching implications in the regulation of signalling pathways and therapeutic interventions. Recent super resolution microscopy studies have revealed that receptor dimer steady state exhibits sub-second dynamics. In particular the GPCRs, muscarinic acetylcholine receptor M1 (M1MR) and formyl peptide receptor (FPR), have been demonstrated to exhibit a fast association/dissociation kinetics, independent of ligand binding. In this work, we have developed a spatial kinetic Monte Carlo model to investigate receptor homo-dimerisation at a single receptor resolution...
May 23, 2017: Physical Biology
https://www.readbyqxmd.com/read/28535145/substrate-curvature-regulates-cell-migration
#20
Xiuxiu He, Yi Jiang
Cell migration is essential in many aspects of biology. Many basic migration processes, including adhesion, membrane protrusion and tension, cytoskeletal polymerization, and contraction, have to act in concert to regulate cell migration. At the same time, substrate topography modulates these processes. In this work, we study how substrate curvature at micrometer scale regulates cell motility. We have developed a 3D mechanical model of single cell migration and simulated migration on curved substrates with different curvatures...
May 23, 2017: Physical Biology
keyword
keyword
11734
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"