keyword
MENU ▼
Read by QxMD icon Read
search

Mathematical model

keyword
https://www.readbyqxmd.com/read/29352488/understanding-intratumor-heterogeneity-by-combining-genome-analysis-and-mathematical-modeling
#1
REVIEW
Atsushi Niida, Satoshi Nagayama, Satoru Miyano, Koshi Mimori
Cancer is composed of multiple cell populations with different genomes. Each of the populations is called a clone (or subclone) and this phenomenon is called intratumor heterogeneity (ITH). ITH is observed in various types of cancers and presumed to be a major cause leading to therapeutic resistance. If a tumor harbors a major clone sensitive to a specific anti-cancer treatment, the tumor shrinks within a given period after the treatment. However, in most cases, a minor clone resistant to the chemotherapy exists in the tumor and predominantly regrows in spite of the intensive therapy...
January 20, 2018: Cancer Science
https://www.readbyqxmd.com/read/29352283/using-a-model-comparison-approach-to-describe-the-assembly-pathway-for-histone-h1
#2
Carlos Contreras, Minaya Villasana, Michael J Hendzel, Gustavo Carrero
Histones H1 or linker histones are highly dynamic proteins that diffuse throughout the cell nucleus and associate with chromatin (DNA and associated proteins). This binding interaction of histone H1 with the chromatin is thought to regulate chromatin organization and DNA accessibility to transcription factors and has been proven to involve a kinetic process characterized by a population that associates weakly with chromatin and rapidly dissociates and another population that resides at a binding site for up to several minutes before dissociating...
2018: PloS One
https://www.readbyqxmd.com/read/29352228/dual-band-metamaterial-antenna-for-lte-bluetooth-wimax-system
#3
Md Mehedi Hasan, Mohammad Rashed Iqbal Faruque, Mohammad Tariqul Islam
A compact metamaterial inspired antenna operate at LTE, Bluetooth and WiMAX frequency band is introduced in this paper. For the lower band, the design utilizes an outer square metallic strip forcing the patch to radiate as an equivalent magnetic-current loop. For the upper band, another magnetic current loop is created by adding metamaterial structure near the feed line on the patch. The metamaterial inspired antenna dimension of 42 × 32 mm2 compatible to wireless devices. Finite integration technique based CST Microwave Studio simulator has been used to design and numerical investigation as well as lumped circuit model of the metamaterial antenna is explained with proper mathematical derivation...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352153/biology-culture-co-evolution-in-finite-populations
#4
Bart de Boer, Bill Thompson
Language is the result of two concurrent evolutionary processes: biological and cultural inheritance. An influential evolutionary hypothesis known as the moving target problem implies inherent limitations on the interactions between our two inheritance streams that result from a difference in pace: the speed of cultural evolution is thought to rule out cognitive adaptation to culturally evolving aspects of language. We examine this hypothesis formally by casting it as as a problem of adaptation in time-varying environments...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352116/the-chemical-fluctuation-theorem-governing-gene-expression
#5
Seong Jun Park, Sanggeun Song, Gil-Suk Yang, Philip M Kim, Sangwoon Yoon, Ji-Hyun Kim, Jaeyoung Sung
Gene expression is a complex stochastic process composed of numerous enzymatic reactions with rates coupled to hidden cell-state variables. Despite advances in single-cell technologies, the lack of a theory accurately describing the gene expression process has restricted a robust, quantitative understanding of gene expression variability among cells. Here we present the Chemical Fluctuation Theorem (CFT), providing an accurate relationship between the environment-coupled chemical dynamics of gene expression and gene expression variability...
January 19, 2018: Nature Communications
https://www.readbyqxmd.com/read/29352067/sandwich-cultured-hepatocytes-for-mechanistic-understanding-of-hepatic-disposition-of-parent-drugs-and-metabolites-by-transporter-enzyme-interplay
#6
Norikazu Matsunaga, Yukina Fukuchi, Haruo Imawaka, Ikumi Tamai
Functional interplay between transporters and drug-metabolizing enzymes is currently one of the hottest topics in the field of drug metabolism and pharmacokinetics. Uptake transporter-enzyme interplay is important to determine intrinsic hepatic clearance based on the extended clearance concept. Enzyme-efflux transporter interplay, which includes both sinusoidal (basolateral) and canalicular efflux transporters, determines the fate of metabolites formed in the liver. As sandwich-cultured hepatocytes (SCHs) maintain metabolic activities and form a canalicular network, the whole interplay between uptake/efflux transporters and drug-metabolizing enzymes can be investigated simultaneously...
January 19, 2018: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/29351912/a-longitudinal-study-of-how-quality-mentorship-and-research-experience-integrate-underrepresented-minorities-into-stem-careers
#7
Mica Estrada, Paul R Hernandez, P Wesley Schultz
African Americans, Latinos, and Native Americans are historically underrepresented minorities (URMs) among science, technology, engineering, and mathematics (STEM) degree earners. Viewed from a perspective of social influence, this pattern suggests that URMs do not integrate into the STEM academic community at the same rate as non-URM students. Estrada and colleagues recently showed that Kelman's tripartite integration model of social influence (TIMSI) predicted URM persistence into science fields. In this paper, we longitudinally examine the integration of URMs into the STEM community by using growth-curve analyses to measure the development of TIMIS's key variables (science efficacy, identity, and values) from junior year through the postbaccalaureate year...
2018: CBE Life Sciences Education
https://www.readbyqxmd.com/read/29351901/xiap-regulation-by-mnk-links-mapk-and-nf%C3%AE%C2%BAb-signaling-to-determine-an-aggressive-breast-cancer-phenotype
#8
Myron K Evans, Michael C Brown, Joseph Geradts, Xuhui Bao, Timothy J Robinson, Mohit Kumar Jolly, Peter Vermeulen, Gregory M Palmer, Matthias Gromeier, Herbert Levine, Michael A Morse, Steven Van Laere, Gayathri R Devi
Hyperactivation of the NFκB pathway is a distinct feature of inflammatory breast cancer (IBC), a highly proliferative and lethal disease. Gene expression studies in IBC patient tissue have linked epidermal growth factor receptor (EGFR/HER2)-mediated MAPK signaling to NFκB hyperactivity, but the mechanism(s) by which this occurs remain unclear. Here, we report that the X-linked inhibitor of apoptosis protein (XIAP) plays a central role in linking these two pathways. XIAP overexpression correlated with poor prognoses in breast cancer patients and was frequently observed in untreated IBC patient primary tumors...
January 19, 2018: Cancer Research
https://www.readbyqxmd.com/read/29351554/field-data-based-mathematical-modeling-by-bode-equations-and-vector-fitting-algorithm-for-renewable-energy-applications
#9
A H Sabry, W Z W Hasan, M Z A Ab Kadir, M A M Radzi, S Shafie
The power system always has several variations in its profile due to random load changes or environmental effects such as device switching effects when generating further transients. Thus, an accurate mathematical model is important because most system parameters vary with time. Curve modeling of power generation is a significant tool for evaluating system performance, monitoring and forecasting. Several numerical techniques compete to fit the curves of empirical data such as wind, solar, and demand power rates...
2018: PloS One
https://www.readbyqxmd.com/read/29351477/mathematical-analysis-of-circadian-disruption-and-metabolic-re-entrainment-of-hepatic-gluconeogenesis-the-intertwining-entraining-roles-of-light-and-feeding
#10
Seul-A Bae, Ioannis P Androulakis
The circadian rhythms influence the metabolic activity from molecular level to tissue, organ, and host level. Disruption of the circadian rhythms manifest to the host's health as metabolic syndromes including obesity, diabetes, and elevated plasma glucose, eventually leading to cardiovascular diseases. Therefore, it is imperative to understand the mechanism behind the relationship between circadian rhythms and metabolism. To start answering this question, we propose a semi-mechanistic mathematical model to study the effect of circadian disruption on hepatic gluconeogenesis in humans...
January 9, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29351421/increased-insulin-clearance-in-mice-with-double-deletion-of-glucagon-like-peptide-1-and-glucose-dependent-insulinotropic-polypeptide-receptors
#11
Andrea Tura, Roberto Bizzotto, Yuichiro Yamada, Yutaka Seino, Giovanni Pacini, Bo Ahren
To establish whether incretin hormones affect insulin clearance, the aim of this study was to assess insulin clearance in mice with genetic deletion of receptors for both glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), so called double incretin receptor knockout mice (DIRKO). DIRKO (n=31) and wild-type (WT) C57BL6J mice (n=45) were intravenously injected with D-glucose (0.35 g/kg). Blood was sampled for 50 minutes and assayed for glucose, insulin and C-peptide. Data were modeled to calculate insulin clearance; C-peptide kinetics was established after human C-peptide injection...
January 3, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29351275/a-mathematical-model-for-il-6-mediated-stem-cell-driven-tumor-growth-and-targeted-treatment
#12
Fereshteh Nazari, Alexander T Pearson, Jacques Eduardo Nör, Trachette L Jackson
Targeting key regulators of the cancer stem cell phenotype to overcome their critical influence on tumor growth is a promising new strategy for cancer treatment. Here we present a modeling framework that operates at both the cellular and molecular levels, for investigating IL-6 mediated, cancer stem cell driven tumor growth and targeted treatment with anti-IL6 antibodies. Our immediate goal is to quantify the influence of IL-6 on cancer stem cell self-renewal and survival, and to characterize the subsequent impact on tumor growth dynamics...
January 19, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29350688/laws-of-physics-help-explain-capillary-non-perfusion-in-diabetic-retinopathy
#13
E Stefánsson, Y K Chan, T Bek, S H Hardarson, D Wong, D I Wilson
The purpose is to use laws of physics to elucidate the mechanisms behind capillary non-perfusion in diabetic retinopathy. In diabetic retinopathy, loss of pericytes weakens capillary walls and the vessel dilates. A dilated capillary has reduced resistance to flow, therefore increased flow in that vessel and decreased in adjoining capillaries. A preferential shunt vessel is thus formed from the dilated capillary and the adjacent capillaries become non-perfused. We apply the laws of Laplace and Hagen-Poiseuille to better understand the phenomena that lead to capillary non-perfusion...
January 19, 2018: Eye
https://www.readbyqxmd.com/read/29350049/targeted-and-off-target-bystander-and-abscopal-effects-of-radiation-therapy-redox-mechanisms-and-risk-benefit-analysis
#14
Jean-Pierre Pouget, Alexandros G Georgakilas, Jean-Luc Ravanat
Radiation therapy (from external beams to unsealed and sealed radionuclide sources) takes advantage of the detrimental effects of the clustered production of radicals and reactive oxygen species (ROS). Research has mainly focused on the interaction of radiation with water, which is the major constituent of living beings, and with nuclear DNA, which contains the genetic information. This led to the so-called "target" theory according to which cells have to be hit by ionizing particles to elicit an important biological response, including cell death...
January 19, 2018: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/29349685/solute-transport-in-the-bone-lacunar-canalicular-system-lcs
#15
REVIEW
Liyun Wang
PURPOSE OF REVIEW: Solute transport in the lacunar-canalicular system (LCS) plays important roles in osteocyte metabolism and cell-cell signaling. This review will summarize recent studies that establish pericellular matrix (PCM), discovered inside the LCS, as a crucial regulator of solute transport in bone. RECENT FINDINGS: Utilizing confocal imaging and mathematical modeling, recent studies successfully quantified molecular diffusion and convection in the LCS as well as the size-dependent sieving effects of the PCM, leading to the quantification of the effective PCM fiber spacing (10 to 17 nm) in murine adult bones...
January 18, 2018: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/29349627/modeling-and-simulation-of-enzymatic-gluconic-acid-production-using-immobilized-enzyme-and-cstr-pftr-circulation-reaction-system
#16
Can Li, Jianqun Lin, Ling Gao, Huibin Lin, Jianqiang Lin
OBJECTIVES: Production of gluconic acid by using immobilized enzyme and continuous stirred tank reactor-plug flow tubular reactor (CSTR-PFTR) circulation reaction system. RESULTS: A production system is constructed for gluconic acid production, which consists of a continuous stirred tank reactor (CSTR) for pH control and liquid storage and a plug flow tubular reactor (PFTR) filled with immobilized glucose oxidase (GOD) for gluconic acid production. Mathematical model is developed for this production system and simulation is made for the enzymatic reaction process...
January 18, 2018: Biotechnology Letters
https://www.readbyqxmd.com/read/29349609/caspase-1-mediated-pyroptosis-of-the-predominance-for-driving-cd4-formula-see-text-t-cells-death-a-nonlocal-spatial-mathematical-model
#17
Wei Wang, Tongqian Zhang
Caspase-1-mediated pyroptosis is the predominance for driving CD4[Formula: see text] T cells death. Dying infected CD4[Formula: see text] T cells can release inflammatory signals which attract more uninfected CD4[Formula: see text] T cells to die. This paper is devoted to developing a diffusive mathematical model which can make useful contributions to understanding caspase-1-mediated pyroptosis by inflammatory cytokines IL-1[Formula: see text] released from infected cells in the within-host environment. The well-posedness of solutions, basic reproduction number, threshold dynamics are investigated for spatially heterogeneous infection...
January 18, 2018: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/29349467/lysine-derived-ph-sensitive-and-biodegradable-poly-beta-aminoester-urethane-networks-and-their-local-drug-delivery-behaviour
#18
Yasemin Tamer, Biqiong Chen
In this study, a series of covalently crosslinked, l-lysine based poly(beta-aminoester urethane) (LPBAEU) networks with good biodegradability and pH sensitivity was reported. The effect of hydrophilic/hydrophobic characteristics and diacrylate/amine molar ratio on the structure, swelling and degradation behaviour of the networks was investigated. The water transport mechanism and dynamic swelling behavior of the LPBAEU networks were strongly affected by medium pH, and swelling amounts up to 252.2% and 148.7% were observed at pH 5...
January 19, 2018: Soft Matter
https://www.readbyqxmd.com/read/29349296/unlocking-data-sets-by-calibrating-populations-of-models-to-data-density-a-study-in-atrial-electrophysiology
#19
Brodie A J Lawson, Christopher C Drovandi, Nicole Cusimano, Pamela Burrage, Blanca Rodriguez, Kevin Burrage
The understanding of complex physical or biological systems nearly always requires a characterization of the variability that underpins these processes. In addition, the data used to calibrate these models may also often exhibit considerable variability. A recent approach to deal with these issues has been to calibrate populations of models (POMs), multiple copies of a single mathematical model but with different parameter values, in response to experimental data. To date, this calibration has been largely limited to selecting models that produce outputs that fall within the ranges of the data set, ignoring any trends that might be present in the data...
January 2018: Science Advances
https://www.readbyqxmd.com/read/29348634/a-biosensor-based-framework-to-measure-latent-proteostasis-capacity
#20
Rebecca J Wood, Angelique R Ormsby, Mona Radwan, Dezerae Cox, Abhishek Sharma, Tobias Vöpel, Simon Ebbinghaus, Mikael Oliveberg, Gavin E Reid, Alex Dickson, Danny M Hatters
The pool of quality control proteins (QC) that maintains protein-folding homeostasis (proteostasis) is dynamic but can become depleted in human disease. A challenge has been in quantitatively defining the depth of the QC pool. With a new biosensor, flow cytometry-based methods and mathematical modeling we measure the QC capacity to act as holdases and suppress biosensor aggregation. The biosensor system comprises a series of barnase kernels with differing folding stability that engage primarily with HSP70 and HSP90 family proteins...
January 18, 2018: Nature Communications
keyword
keyword
179
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"