keyword
MENU ▼
Read by QxMD icon Read
search

Mathematic

keyword
https://www.readbyqxmd.com/read/29161271/a-mathematical-function-for-the-description-of-nutrient-response-curve
#1
Hamed Ahmadi
Several mathematical equations have been proposed to modeling nutrient-response curve for animal and human justified on the goodness of fit and/or on the biological mechanism. In this paper, a functional form of a generalized quantitative model based on Rayleigh distribution principle for description of nutrient-response phenomena is derived. The three parameters governing the curve a) has biological interpretation, b) may be used to calculate reliable estimates of nutrient response relationships, and c) provide the basis for deriving relationships between nutrient and physiological responses...
2017: PloS One
https://www.readbyqxmd.com/read/29161259/the-us-president-s-malaria-initiative-plasmodium-falciparum-transmission-and-mortality-a-modelling-study
#2
Peter Winskill, Hannah C Slater, Jamie T Griffin, Azra C Ghani, Patrick G T Walker
BACKGROUND: Although significant progress has been made in reducing malaria transmission globally in recent years, a large number of people remain at risk and hence the gains made are fragile. Funding lags well behind amounts needed to protect all those at risk and ongoing contributions from major donors, such as the President's Malaria Initiative (PMI), are vital to maintain progress and pursue further reductions in burden. We use a mathematical modelling approach to estimate the impact of PMI investments to date in reducing malaria burden and to explore the potential negative impact on malaria burden should a proposed 44% reduction in PMI funding occur...
November 2017: PLoS Medicine
https://www.readbyqxmd.com/read/29161187/network-mapping-with-gimme
#3
Adriene M Beltz, Kathleen M Gates
Network science is booming! While the insights and images afforded by network mapping techniques are compelling, implementing the techniques is often daunting to researchers. Thus, the aim of this tutorial is to facilitate implementation in the context of GIMME, or group iterative multiple model estimation. GIMME is an automated network analysis approach for intensive longitudinal data. It creates person-specific networks that explain how variables are related in a system. The relations can signify current or future prediction that is common across people or applicable only to an individual...
November 2017: Multivariate Behavioral Research
https://www.readbyqxmd.com/read/29160885/drying-kinetics-of-water-droplets-stabilized-by-surfactant-molecules-or-solid-particles-in-a-thin-non-volatile-oil-layer
#4
Hayato Miyazaki, Susumu Inasawa
We have investigated drying of water droplets stabilized by solid particles or surfactant molecules in a thin oil layer. The surfactant-stabilized droplets isotropically shrink, whereas the droplets stabilized by spherical particles severely deform during drying because of buckling of the particulate shells. However, buckling of the shells hardly affects droplet drying. The drying times for complete evaporation are almost the same for water droplets with the same initial diameter and the drying time is independent of the type of surface stabilizer (particles or surfactant)...
November 21, 2017: Soft Matter
https://www.readbyqxmd.com/read/29160344/quantification-of-intrusive-retraction-force-and-moment-generated-during-en-masse-retraction-of-maxillary-anterior-teeth-using-mini-implants-a-conceptual-approach
#5
A Sumathi Felicita
OBJECTIVE: The aim of the present study was to clarify the biomechanics of en-masse retraction of the upper anterior teeth and attempt to quantify the different forces and moments generated using mini-implants and to calculate the amount of applied force optimal for en-masse intrusion and retraction using mini-implants. METHODS: The optimum force required for en-masse intrusion and retraction can be calculated by using simple mathematical formulae. Depending on the position of the mini-implant and the relationship of the attachment to the center of resistance of the anterior segment, different clinical outcomes are encountered...
September 2017: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/29160331/primum-non-nocere-or-primum-facere-meliorem-hacking-the-brain-in-the-21st-century
#6
Lucas Borrione, Andre R Brunoni
Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique that modulates cortical excitability. It is devoid of serious adverse events and exerts variable effects on cognition, with several research findings suggesting that it can improve memory, verbal and mathematical skills. Because tDCS devices are low-cost, portable and relatively easy to assemble, they have become available outside of the medical setting and used for non-medical ("cosmetic") purposes by laypersons. In this sense, tDCS has become a popular technique aiming to improve cognition and the achievement of a better performance not only at work, but also in other fields such as sports, leisure activities (video games) and even the military...
November 13, 2017: Trends in Psychiatry and Psychotherapy
https://www.readbyqxmd.com/read/29159807/experimental-investigation-of-gafchromic-%C3%A2-ebt3-intrinsic-energy-dependence-with-kilovoltage-x-rays-137-cs-and-60-co
#7
Cliff G Hammer, Benjamin Saul Rosen, Jessica M Fagerstrom, Wesley S Culberson, Larry A DeWerd
PURPOSE: To determine experimentally the intrinsic energy response, kbq , of EBT3 GafChromic(®) radiochromic film with kilovoltage x-rays,(137) Cs, and (60) Co in therapeutic and diagnostic dose ranges through direct measurement with an accompanying mathematical approach to describe the physical processes involved. METHODS: EBT3 film was irradiated to known doses using (60) Co, (137) Cs, and 13 NIST-matched kilovoltage x-ray beams. Seven dose levels, ranging from 57 to 7002 mGy, were chosen for this work...
November 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/29159679/the-location-word-and-arrow-based-simon-effects-an-ex-gaussian-analysis
#8
Chunming Luo, Robert W Proctor
Task-irrelevant spatial information, conveyed by stimulus location, location word, or arrow direction, can influence the response to task-relevant attributes, generating the location-, word-, and arrow-based Simon effects. We examined whether different mechanisms are involved in the generation of these Simon effects by fitting a mathematical ex-Gaussian function to empirical response time (RT) distributions. Specifically, we tested whether which ex-Gaussian parameters (μ, σ, and τ) show Simon effects and whether the location-, word, and arrow-based effects are on different parameters...
November 20, 2017: Memory & Cognition
https://www.readbyqxmd.com/read/29159570/multi-timescale-analysis-of-a-metabolic-network-in-synthetic-biology-a-kinetic-model-for-3-hydroxypropionic-acid-production-via-beta-alanine
#9
Mohit P Dalwadi, John R King, Nigel P Minton
A biosustainable production route for 3-hydroxypropionic acid (3HP), an important platform chemical, would allow 3HP to be produced without using fossil fuels. We are interested in investigating a potential biochemical route to 3HP from pyruvate through [Formula: see text]-alanine and, in this paper, we develop and solve a mathematical model for the reaction kinetics of the metabolites involved in this pathway. We consider two limiting cases, one where the levels of pyruvate are never replenished, the other where the levels of pyruvate are continuously replenished and thus kept constant...
November 20, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/29159532/a-multiphysics-approach-for-modeling-early-atherosclerosis
#10
M P Thon, A Hemmler, A Glinzer, M Mayr, M Wildgruber, A Zernecke-Madsen, M W Gee
This work is devoted to the development of a mathematical model of the early stages of atherosclerosis incorporating processes of all time scales of the disease and to show their interactions. The cardiovascular mechanics is modeled by a fluid-structure interaction approach coupling a non-Newtonian fluid to a hyperelastic solid undergoing anisotropic growth and a change of its constitutive equation. Additionally, the transport of low-density lipoproteins and its penetration through the endothelium is considered by a coupled set of advection-diffusion-reaction equations...
November 20, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/29159223/programs-for-the-calculation-of-the-spinodal-decomposition-growth-rate-and-the-spinodal-gap-in-nanoparticles
#11
Evgeny Pogorelov, Julia Kundin
This data article contains the programs for the calculation of the spinodal decomposition growth rate and for the modeling of the spinodal gap and concentration profiles in nanoparticles which were used in our article (Pogorelov et al., 2017) [1]. The modeling is based on the mathematical model of spinodal phase decomposition with intercalation rate conditions on the boundaries (Singh et al., 2008) [2]. The maximal growth rate and the parameters of the concentration wave function can be evaluated for a fixed mean composition and intercalation rate...
December 2017: Data in Brief
https://www.readbyqxmd.com/read/29158608/a-fully-coupled-space-time-multiscale-modeling-framework-for-predicting-tumor-growth
#12
Mohammad Mamunur Rahman, Yusheng Feng, Thomas E Yankeelov, J Tinsley Oden
Most biological systems encountered in living organisms involve highly complex heterogeneous multi-component structures that exhibit different physical, chemical, and biological behavior at different spatial and temporal scales. The development of predictive mathematical and computational models of multiscale events in such systems is a major challenge in contemporary computational biomechanics, particularly the development of models of growing tumors in humans. The aim of this study is to develop a general framework for tumor growth prediction by considering major biological events at tissue, cellular, and subcellular scales...
June 15, 2017: Computer Methods in Applied Mechanics and Engineering
https://www.readbyqxmd.com/read/29158597/a-new-paradigm-in-modelling-the-evolution-of-a-stand-via-the-distribution-of-tree-sizes
#13
Petras Rupšys, Edmundas Petrauskas
Our study focusses on investigating a modern modelling paradigm, a bivariate stochastic process, that allows us to link individual tree variables with growth and yield stand attributes. In this paper, our aim is to introduce the mathematics of mixed effect parameters in a bivariate stochastic differential equation and to describe how such a model can be used to aid our understanding of the bivariate height and diameter distribution in a stand using a large dataset provided by the Lithuanian National Forest Inventory (LNFI)...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158230/neoantigen-quality-predicts-immune-response-survival
#14
(no author information available yet)
A new mathematical model finds that tumor neoantigen quality trumps quantity when it comes to predicting response to immunotherapy and the likelihood of long-term survival among patients with cancer.
November 20, 2017: Cancer Discovery
https://www.readbyqxmd.com/read/29158122/biomarkers-distinguish-hbeag-seroconverted-from-non-converted-individuals-in-chronic-hepatitis-b-patients-treated-with-a-therapeutic-vaccine
#15
Xian Zhou, Shuang Geng, Shijie Zhang, Weidong Zhao, Gan Zhao, Yumei Wen, Xuanyi Wang, Bin Wang
Cytokine assays of host immune responses to vaccination can indicate vaccine efficacy. Here we tested the hypothesis that assays of the cytokine status of infected individuals prior to therapeutic vaccination might provide a guide to vaccine therapeutic efficacy. If so, cytokine analysis might be used to select appropriate patients for therapeutic vaccination. Data were obtained from a panel of 14 cytokine/chemokine assays that were done during a phase III clinical trial of HBsAg-HBIG therapeutic vaccine (YIC) treatment of chronic hepatitis B (CHB) patients...
November 17, 2017: Cytokine
https://www.readbyqxmd.com/read/29157936/short-parietal-lobe-connections-of-the-human-and-monkey-brain
#16
Marco Catani, Naianna Robertsson, Ahmad Beyh, Vincent Huynh, Francisco de Santiago Requejo, Henrietta Howells, Rachel L C Barrett, Marco Aiello, Carlo Cavaliere, Tim B Dyrby, Kristine Krug, Maurice Ptito, Helen D'Arceuil, Stephanie J Forkel, Flavio Dell'Acqua
The parietal lobe has a unique place in the human brain. Anatomically, it is at the crossroad between the frontal, occipital, and temporal lobes, thus providing a middle ground for multimodal sensory integration. Functionally, it supports higher cognitive functions that are characteristic of the human species, such as mathematical cognition, semantic and pragmatic aspects of language, and abstract thinking. Despite its importance, a comprehensive comparison of human and simian intraparietal networks is missing...
November 2, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29157914/population-sensitivities-of-animals-to-chronic-ionizing-radiation-model-predictions-from-mice-to-elephant
#17
Tatiana G Sazykina
Model predictions of population response to chronic ionizing radiation (endpoint 'morbidity') were made for 11 species of warm-blooded animals, differing in body mass and lifespan - from mice to elephant. Predictions were made also for 3 bird species (duck, pigeon, and house sparrow). Calculations were based on analytical solutions of the mathematical model, simulating a population response to low-LET ionizing radiation in an ecosystem with a limiting resource (Sazykina, Kryshev, 2016). Model parameters for different species were taken from biological and radioecological databases; allometric relationships were employed for estimating some parameter values...
November 17, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29157654/an-innovative-lung-model-for-multiple-breath-washout-testing-in-health-and-disease
#18
Pinelopi Anagnostopoulou, Sarah Vomsattel, Anne-Christiane Kentgens, Marisa Guidi, Severin Binggeli, Lena Kohler, Florian Singer, Philipp Latzin, Dominik Obrist
BACKGROUND: Multiple breath washout (MBW) is a lung function test that identifies the degree of ventilation inhomogeneity (VI) in the lungs. In vitro validation of MBW devices is recommended. So far, plastic lung models for MBW validation ignored variable degrees of VI. Our primary aim was to create a plastic lung model applicable for physiological lung volumes and variable VI. METHODS: A plastic box divided in two chambers was filled with water and ventilated in various lung volumes and respiratory rates...
November 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29157456/real-time-deformation-of-human-soft-tissues-a-radial-basis-meshless-3d-model-based-on-marquardt-s-algorithm
#19
Jianyong Zhou, Zu Luo, Chunquan Li, Mi Deng
BACKGROUND: When the meshless method is used to establish the mathematical-mechanical model of human soft tissues, it is necessary to define the space occupied by human tissues as the problem domain and the boundary of the domain as the surface of those tissues. Nodes should be distributed in both the problem domain and on the boundaries. Under external force, the displacement of the node is computed by the meshless method to represent the deformation of biological soft tissues. However, computation by the meshless method consumes too much time, which will affect the simulation of real-time deformation of human tissues in virtual surgery...
January 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29157366/culling-from-the-actors-perspectives-decision-making-criteria-for-culling-in-qu%C3%A3-bec-dairy-herds-enrolled-in-a-veterinary-preventive-medicine-program
#20
Denis Haine, Roger Cue, Asheber Sewalem, Kevin Wade, René Lacroix, Daniel Lefebvre, Jonathan Rushton, Julie Arsenault, Émile Bouchard, Jocelyn Dubuc
The series of events leading to the decision to cull a cow is complex, involving both individual-level and herd-level factors. While the decision is guided by financial returns, it is also influenced by social and psychological factors. Research studies on the motivational and behavioural aspects of farmers' decision utility are sparse, and nonexistent regarding culling expectations and its decision process. Our goal was to identify shared criteria on culling decisions held by dairy producers and farm advisers, with the help of the Q-methodology...
December 1, 2017: Preventive Veterinary Medicine
keyword
keyword
7839
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"