Read by QxMD icon Read

Markov condition

Robert I Cukier
Intrinsically disordered proteins (IDPs) sample a diverse conformational space. They are important to signaling and regulatory pathways in cells. An entropy penalty must be payed when an IDP becomes ordered upon interaction with another protein or a ligand. Thus, the degree of conformational disorder of an IDP is of interest. We create a dichotomic Markov model that can explore entropic features of an IDP. The Markov condition introduces local (neighbor residues in a protein sequence) rotamer dependences that arise from van der Waals and other chemical constraints...
March 14, 2018: Journal of Chemical Physics
(no author information available yet)
Background: Type 1 diabetes is a condition in which the pancreas produces little or no insulin. People with type 1 diabetes must manage their blood glucose levels by monitoring the amount of glucose in their blood and administering appropriate amounts of insulin via injection or an insulin pump. Continuous glucose monitoring may be beneficial compared to self-monitoring of blood glucose using a blood glucose meter. It provides insight into a person's blood glucose levels on a continuous basis, and can identify whether blood glucose levels are trending up or down...
2018: Ontario Health Technology Assessment Series
Bob Rehder
Although many theories of causal cognition are based on causal graphical models, a key property of such models-the independence relations stipulated by the Markov condition-is routinely violated by human reasoners. This article presents three new accounts of those independence violations, accounts that share the assumption that people's understanding of the correlational structure of data generated from a causal graph differs from that stipulated by causal graphical model framework. To distinguish these models, experiments assessed how people reason with causal graphs that are larger than those tested in previous studies...
March 6, 2018: Cognitive Psychology
C Randall Harrell, Bojana Simovic Markovic, Crissy Fellabaum, Aleksandar Arsenijevic, Valentin Djonov, Vladislav Volarevic
BACKGROUND: Pericytes are multipotent cells present in every vascularized tissue in the body. Despite the fact that they are well-known for more than a century, pericytes are still representing cells with intriguing properties. This is mainly because of their heterogeneity in terms of definition, tissue distribution, origin, phenotype and multi-functional properties. The body of knowledge illustrates importance of pericytes in the regulation of homeostatic and healing processes in the body...
March 9, 2018: Journal of Biomedical Science
Kathryn E Hendee, Elena A Sorokina, Sanaa S Muheisen, Linda M Reis, Rebecca C Tyler, Vujica Markovic, Goran Cuturilo, Brian A Link, Elena V Semina
The PITX2 (paired-like homeodomain 2) gene encodes a bicoid-like homeodomain transcription factor linked with several human disorders. The main associated congenital phenotype is Axenfeld-Rieger syndrome, type 1 (ARS), an autosomal dominant condition characterized by variable defects in the anterior segment of the eye, an increased risk of glaucoma, craniofacial dysmorphism and dental and umbilical anomalies; in addition to this, one report implicated PITX2 in ring dermoid of the cornea and a few others described cardiac phenotypes...
March 1, 2018: Human Molecular Genetics
Faustin Habyarimana, Temesgen Zewotir, Shaun Ramroop
The main objective of this study was to assess the risk factors and spatial correlates of domestic violence against women of reproductive age in Rwanda. A structured spatial approach was used to account for the nonlinear nature of some covariates and the spatial variability on domestic violence. The nonlinear effect was modeled through second-order random walk, and the structured spatial effect was modeled through Gaussian Markov Random Fields specified as an intrinsic conditional autoregressive model. The data from the Rwanda Demographic and Health Survey 2014/2015 were used as an application...
March 1, 2018: Journal of Interpersonal Violence
Nóra Zákány, Attila Oláh, Arnold Markovics, Erika Takács, Andrea Aranyász, Simon Nicolussi, Fabiana Piscitelli, Marco Allarà, Ágnes Pór, Ilona Kovács, Christos C Zouboulis, Jürg Gertsch, Vincenzo Di Marzo, Tamás Bíró, Tamás Szabó
We have previously shown that i) endocannabinoids (eCB; e.g. anandamide [AEA]) are involved in the maintenance of homeostatic sebaceous lipid production (SLP) in human sebaceous glands (SG); and ii) eCB treatment dramatically increases SLP. Here, we aimed to investigate the expression of the major eCB synthesizing and degrading enzymes, and to study the effects of eCB uptake inhibitors on human SZ95 sebocytes, thus exploring the role of the putative eCB membrane transporter (EMT), which has been hypothesized to facilitate the cellular uptake and subsequent degradation of eCBs...
February 28, 2018: Journal of Investigative Dermatology
Youngjoo Suh, Hoirin Kim
The histogram equalization approach is an efficient feature normalization technique for noise robust automatic speech recognition. However, it suffers from performance degradation when some fundamental conditions are not satisfied in the test environment. To remedy these limitations of the original histogram equalization methods, class-based histogram equalization approach has been proposed. Although this approach showed substantial performance improvement under noise environments, it still suffers from performance degradation due to the overfitting problem when test data are insufficient...
February 2018: Journal of the Acoustical Society of America
Shanzhi Xu, Hai Hu, Linhong Ji, Peng Wang
The recorded electroencephalography (EEG) signal is often contaminated with different kinds of artifacts and noise. Singular spectrum analysis (SSA) is a powerful tool for extracting the brain rhythm from a noisy EEG signal. By analyzing the frequency characteristics of the reconstructed component (RC) and the change rate in the trace of the Toeplitz matrix, it is demonstrated that the embedding dimension is related to the frequency bandwidth of each reconstructed component, in consistence with the component mixing in the singular value decomposition step...
February 26, 2018: Sensors
M V Skulachev, V P Skulachev
(i) In 2015-2017 we compared possible reasons for longevity of two mammalian highly social species, i.e. naked mole rats and humans. We proposed that in both cases longevity is a result of neoteny, prolongation of youth by deceleration of late ontogeny (Skulachev, V. P. (2015) Abst. 11th Conf. on Mitochondrial Physiology (MiP2015), Lucni Bouda, Czech Republic, pp. 64-66; Skulachev, V. P., Holtze, S., Vyssokikh, M. Y., Bakeeva, L. E., Skulachev, M. V., Markov, A. V., Hildebrandt, T. B., and Sadovnichii, V. A...
December 2017: Biochemistry. Biokhimii︠a︡
S Jeremić, A Amić, M Stanojević-Pirković, Z Marković
Disruption of homeostasis can increase the amount of free radicals formed during metabolic processes. This phenomenon known as oxidative stress can have numerous negative outcomes. The role of dietary antioxidants is to help the prevention of oxidative stress. We investigated free radical scavenging capacity of six structurally similar anthraquinones (alizarin, purpurin, chrysophanol, emodin, aloe-emodin and 1,3,8-trihydroxyanthraquinone) for inactivating a set of ten hydroxy and peroxy free radicals. The antioxidant capacity of anthraquinones was estimated by considering Gibbs free energy of three studied reaction mechanisms: hydrogen atom transfer (HAT), single-electron transfer followed by proton transfer (SET-PT) and sequential proton loss electron transfer (SPLET)...
February 26, 2018: Organic & Biomolecular Chemistry
V V Ivanov, E E Achkasov, N M Markov, E K Krechina
The study objective was to determinate variations of stato-dynamical functional markers of postural balance system in the process of malocclusion treatment. Twenty patients aged from 14 to 30 years with class II malocclusion were recruited for this prospective study. All patients underwent electromyography of mm. temporalis and mm. maseter in rest and at maximal jaws pressure. Postural balance was evaluated by stabilometry platform and body's regions relationship was assessed by computer optical topography...
2018: Stomatologii︠a︡
Steven J McAnany, Robert K Merrill, Samuel C Overley, Jun S Kim, Robert L Brochin, Sheeraz A Qureshi
Study Design: Cost-effectiveness analysis. Objectives: To determine the 7-year cost-effectiveness of cervical disc replacement (CDR) and anterior cervical discectomy and fusion (ACDF). Methods: We analyzed 7-year Short Form-36 Health Survey data collected from the Prestige Cervical Disc investigational device exemption study (IDE). The SF-6D algorithm was used to convert this data into health state utilities. Costs were calculated from the payer perspective, and quality adjusted life years (QALYs) were used to represent effectiveness...
February 2018: Global Spine Journal
Carsten Wiuf
In many areas of genetics it is of relevance to consider a population of individuals that is founded by a single individual in the past. One model for such a scenario is the conditioned reconstructed process with Bernoulli sampling that describes the evolution of a population of individuals that originates from a single individual. Several aspects of this reconstructed process are studied, in particular the Markov structure of the process. It is shown that at any given time in the past, the conditioned reconstructed process behaves as the original conditioned reconstructed process after a suitable time-dependent change of the sampling probability...
February 13, 2018: Theoretical Population Biology
Spyros Kolovos, Judith E Bosmans, Heleen Riper, Karine Chevreul, Veerle M H Coupé, Maurits W van Tulder
BACKGROUND: An increasing number of model-based studies that evaluate the cost effectiveness of treatments for depression are being published. These studies have different characteristics and use different simulation methods. OBJECTIVE: We aimed to systematically review model-based studies evaluating the cost effectiveness of treatments for depression and examine which modelling technique is most appropriate for simulating the natural course of depression. METHODS: The literature search was conducted in the databases PubMed, EMBASE and PsycInfo between 1 January 2002 and 1 October 2016...
September 2017: PharmacoEconomics Open
Felix A Pollock, César Rodríguez-Rosario, Thomas Frauenheim, Mauro Paternostro, Kavan Modi
We derive a necessary and sufficient condition for a quantum process to be Markovian which coincides with the classical one in the relevant limit. Our condition unifies all previously known definitions for quantum Markov processes by accounting for all potentially detectable memory effects. We then derive a family of measures of non-Markovianity with clear operational interpretations, such as the size of the memory required to simulate a process or the experimental falsifiability of a Markovian hypothesis.
January 26, 2018: Physical Review Letters
Andreas Ettlinger, Hans Neuner, Thomas Burgess
The topic of indoor positioning and indoor navigation by using observations from smartphone sensors is very challenging as the determined trajectories can be subject to significant deviations compared to the route travelled in reality. Especially the calculation of the direction of movement is the critical part of pedestrian positioning approaches such as Pedestrian Dead Reckoning ("PDR"). Due to distinct systematic effects in filtered trajectories, it can be assumed that there are systematic deviations present in the observations from smartphone sensors...
January 31, 2018: Sensors
Roberto Bizzotto, Stefano Zamuner
The statistical distributions of bout lengths for the different (macro) sleep states (wake, N1, N2, N3 and REM sleep) are essential to understand whether any memory-free sub-component ("micro state") is involved in the organization of sleep. Micro states detection can be prevented by the fusion of data including various sources of variability, in particular by the differences in sleep architecture between individuals, along sleep time (or night-time), or among different nights. In this analysis, a mathematical model of sleep was adopted to disentangle these features and advance the understanding of the dynamics and mechanisms of sleep and its states...
January 31, 2018: Journal of Neurophysiology
Yingzhuo Zhang, Noa Malem-Shinitski, Stephen A Allsop, Kay Tye, Demba Ba
A fundamental problem in neuroscience is to characterize the dynamics of spiking from the neurons in a circuit that is involved in learning about a stimulus or a contingency. A key limitation of current methods to analyze neural spiking data is the need to collapse neural activity over time or trials, which may cause the loss of information pertinent to understanding the function of a neuron or circuit. We introduce a new method that can determine not only the trial-to-trial dynamics that accompany the learning of a contingency by a neuron, but also the latency of this learning with respect to the onset of a conditioned stimulus...
January 30, 2018: Neural Computation
Punkaj Gupta, Mallikarjuna Rettiganti, Andrew Wilcox, Mai-Anh Vuong-Dac, Jeffrey M Gossett, Michiaki Imamura, Avishek Chakraborty
OBJECTIVES: To empirically derive an inotrope score to predict real-time outcomes using the doses of inotropes after pediatric cardiac surgery. The outcomes evaluated included in-hospital mortality, prolonged hospital length of stay (LOS), and composite poor outcome (mortality and/or prolonged hospital LOS). METHODS: The study population included patients <18 years of age undergoing heart operations (with or without cardiopulmonary bypass) of varying complexity...
January 19, 2018: Seminars in Thoracic and Cardiovascular Surgery
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"