keyword
MENU ▼
Read by QxMD icon Read
search

Network theory

keyword
https://www.readbyqxmd.com/read/28350890/quantification-of-motor-network-dynamics-in-parkinson-s-disease-by-means-of-landscape-and-flux-theory
#1
Han Yan, Jin Wang
The basal ganglia neural circuit plays an important role in motor control. Despite the significant efforts, the understanding of the principles and underlying mechanisms of this modulatory circuit and the emergence of abnormal synchronized oscillations in movement disorders is still challenging. Dopamine loss has been proved to be responsible for Parkinson's disease. We quantitatively described the dynamics of the basal ganglia-thalamo-cortical circuit in Parkinson's disease in terms of the emergence of both abnormal firing rates and firing patterns in the circuit...
2017: PloS One
https://www.readbyqxmd.com/read/28350835/an-information-based-network-approach-for-protein-classification
#2
Xiaogeng Wan, Xin Zhao, Stephen S T Yau
Protein classification is one of the critical problems in bioinformatics. Early studies used geometric distances and polygenetic-tree to classify proteins. These methods use binary trees to present protein classification. In this paper, we propose a new protein classification method, whereby theories of information and networks are used to classify the multivariate relationships of proteins. In this study, protein universe is modeled as an undirected network, where proteins are classified according to their connections...
2017: PloS One
https://www.readbyqxmd.com/read/28346742/leaf-economic-and-hydraulic-divergences-underpin-ecological-differentiation-in-the-bromeliaceae
#3
Jamie Males, Howard Griffiths
Leaf economic and hydraulic theory have rarely been applied to the ecological differentiation of speciose herbaceous plant radiations. The role of character trait divergences and network reorganisation in the differentiation of the functional types in the megadiverse Neotropical Bromeliaceae was explored by quantifying a range of leaf economic and hydraulic traits in 50 diverse species. Functional types, which are defined by combinations of C3 or CAM photosynthesis, terrestrial or epiphytic habits, and non-specialised, tank-forming or atmospheric morphologies, segregated clearly in trait space...
March 27, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28346736/loss-of-predator-species-not-intermediate-consumers-triggers-rapid-and-dramatic-extinction-cascades
#4
Ian Donohue, Owen L Petchey, Sonia Kéfi, Alexandre Génin, Andrew L Jackson, Qiang Yang, Nessa E O'Connor
Ecological networks are tightly interconnected, such that loss of a single species can trigger additional species extinctions. Theory predicts that such secondary extinctions are driven primarily by loss of species from intermediate or basal trophic levels. In contrast, most cases of secondary extinctions from natural systems have been attributed to loss of entire top trophic levels. Here, we show that loss of single predator species in isolation can, irrespective of their identity or the presence of other predators, trigger rapid secondary extinction cascades in natural communities far exceeding those generally predicted by theory...
March 27, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28345604/mind-wandering-and-alterations-to-default-mode-network-connectivity-when-listening-to-naturalistic-versus-artificial-sounds
#5
Cassandra D Gould van Praag, Sarah N Garfinkel, Oliver Sparasci, Alex Mees, Andrew O Philippides, Mark Ware, Cristina Ottaviani, Hugo D Critchley
Naturalistic environments have been demonstrated to promote relaxation and wellbeing. We assess opposing theoretical accounts for these effects through investigation of autonomic arousal and alterations of activation and functional connectivity within the default mode network (DMN) of the brain while participants listened to sounds from artificial and natural environments. We found no evidence for increased DMN activity in the naturalistic compared to artificial or control condition, however, seed based functional connectivity showed a shift from anterior to posterior midline functional coupling in the naturalistic condition...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28344466/an-overview-of-pharmacodynamic-modelling-ligand-binding-approach-and-its-application-in-clinical-practice
#6
REVIEW
Mohammed Saji Salahudeen, Prasad S Nishtala
The study of the magnitude and variation of drug response is defined as pharmacodynamics (PDs). PD models examine plasma concentration and effect relationship. It can predict the archetypal effect ([Formula: see text]) of a drug as a function of the drug concentration ([Formula: see text]) and estimate an unknown PD parameter ([Formula: see text]). The PD models have been described as fixed, linear, log-linear, [Formula: see text], sigmoid [Formula: see text], and indirect PD response. Ligand binding model is an example of a PD model that works on the underpinning PD principle of a drug, eliciting its pharmacological effect at the receptor site...
February 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28343985/functional-connectivity-dynamically-evolves-on-multiple-time-scales-over-a-static-structural-connectome-models-and-mechanisms
#7
REVIEW
Joana Cabral, Morten Kringelbach, Gustavo Deco
Over the last decade, we have observed a revolution in brain structural and functional Connectomics. On one hand, we have an ever-more detailed characterization of the brain's white matter structural connectome. On the other, we have a repertoire of consistent functional networks that form and dissipate over time during rest. Despite the evident spatial similarities between structural and functional connectivity, understanding how different time-evolving functional networks spontaneously emerge from a single structural network requires analyzing the problem from the perspective of complex network dynamics and dynamical system's theory...
March 23, 2017: NeuroImage
https://www.readbyqxmd.com/read/28343248/uncovering-specific-changes-in-network-wiring-underlying-the-primate-cerebrotype
#8
Salah Hamodeh, Ayse Bozkurt, Haian Mao, Fahad Sultan
Regular scaling of brain networks during evolution has been proposed to be the major process leading to enlarged brains. Alternative views, however, suggest that deviations from regular scaling were crucial to the evolution of the primate brain and the emergence of different cerebrotypes. Here, we examined the scaling within the major link between the cerebellum and the cerebral cortex by studying the deep cerebellar nuclei (DCN). We compared the major axonal and dendritic wiring in the DCN of rodents and monkeys in search of regular scaling...
March 25, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28340346/the-upsides-and-downsides-of-organelle-interconnectivity
#9
REVIEW
Daniel E Gottschling, Thomas Nyström
Interconnectivity and feedback control are hallmarks of biological systems. This includes communication between organelles, which allows them to function and adapt to changing cellular environments. While the specific mechanisms for all communications remain opaque, unraveling the wiring of organelle networks is critical to understand how biological systems are built and why they might collapse, as occurs in aging. A comprehensive understanding of all the routes involved in inter-organelle communication is still lacking, but important themes are beginning to emerge, primarily in budding yeast...
March 23, 2017: Cell
https://www.readbyqxmd.com/read/28339555/an-item-bank-for-abuse-of-prescription-pain-medication-from-the-patient-reported-outcomes-measurement-information-system-promis%C3%A2
#10
Paul A Pilkonis, Lan Yu, Nathan E Dodds, Kelly L Johnston, Suzanne M Lawrence, Thomas F Hilton, Dennis C Daley, Ashwin A Patkar, Dennis McCarty
Objective.:  There is a need to monitor patients receiving prescription opioids to detect possible signs of abuse. To address this need, we developed and calibrated an item bank for severity of abuse of prescription pain medication as part of the Patient-Reported Outcomes Measurement Information System (PROMIS ® ). Methods.:  Comprehensive literature searches yielded an initial bank of 5,310 items relevant to substance use and abuse, including abuse of prescription pain medication, from over 80 unique instruments...
October 8, 2016: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28337156/lack-of-evidence-that-neural-empathic-responses-are-blunted-in-excessive-users-of-violent-video-games-an-fmri-study
#11
Gregor R Szycik, Bahram Mohammadi, Thomas F Münte, Bert T Te Wildt
The use of violent video games has been often linked to increase of aggressive behavior. According to the General Aggression Model, one of the central mechanisms for this aggressiveness inducing impact is an emotional desensitization process resulting from long lasting repeated violent game playing. This desensitization should evidence itself in a lack of empathy. Recent research has focused primarily on acute, short term impact of violent media use but only little is known about long term effects. In this study 15 excessive users of violent games and control subjects matched for age and education viewed pictures depicting emotional and neutral situations with and without social interaction while fMRI activations were obtained...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28336791/faultless-responsibility-on-the-nature-and-allocation-of-moral-responsibility-for-distributed-moral-actions
#12
Luciano Floridi
The concept of distributed moral responsibility (DMR) has a long history. When it is understood as being entirely reducible to the sum of (some) human, individual and already morally loaded actions, then the allocation of DMR, and hence of praise and reward or blame and punishment, may be pragmatically difficult, but not conceptually problematic. However, in distributed environments, it is increasingly possible that a network of agents, some human, some artificial (e.g. a program) and some hybrid (e.g. a group of people working as a team thanks to a software platform), may cause distributed moral actions (DMAs)...
December 28, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28336496/functional-eeg-network-analysis-in-schizophrenia-evidence-of-larger-segregation-and-deficit-of-modulation
#13
Javier Gomez-Pilar, Alba Lubeiro, Jesús Poza, Roberto Hornero, Marta Ayuso, César Valcárcel, Karim Haidar, José A Blanco, Vicente Molina
OBJECTIVE: Higher mental functions depend on global cerebral functional coordination. Our aim was to study fast modulation of functional networks in schizophrenia that has not been previously assessed. METHODS: Graph-theory was used to analyze the electroencephalographic (EEG) activity during an odd-ball task in 57 schizophrenia patients (18 first episode patients, FEPs) and 59 healthy controls. Clustering coefficient (CLC), characteristic path length (PL) and small-worldness (SW) were computed at baseline ([-300 0] ms prior to stimulus delivery) and response ([150 450] ms post-stimulus) windows...
March 20, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28334943/effects-of-prefrontal-cortex-damage-on-emotion-understanding-eeg-and-behavioural-evidence
#14
Anat Perry, Samantha N Saunders, Jennifer Stiso, Callum Dewar, Jamie Lubell, Torstein R Meling, Anne-Kristin Solbakk, Tor Endestad, Robert T Knight
Humans are highly social beings that interact with each other on a daily basis. In these complex interactions, we get along by being able to identify others' actions and infer their intentions, thoughts and feelings. One of the major theories accounting for this critical ability assumes that the understanding of social signals is based on a primordial tendency to simulate observed actions by activating a mirror neuron system. If mirror neuron regions are important for action and emotion recognition, damage to regions in this network should lead to deficits in these domains...
February 22, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334882/decreased-integration-and-information-capacity-in-stroke-measured-by-whole-brain-models-of-resting-state-activity
#15
Mohit H Adhikari, Carl D Hacker, Josh S Siegel, Alessandra Griffa, Patric Hagmann, Gustavo Deco, Maurizio Corbetta
While several studies have shown that focal lesions affect the communication between structurally normal regions of the brain, and that these changes may correlate with behavioural deficits, their impact on brain's information processing capacity is currently unknown. Here we test the hypothesis that focal lesions decrease the brain's information processing capacity, of which changes in functional connectivity may be a measurable correlate. To measure processing capacity, we turned to whole brain computational modelling to estimate the integration and segregation of information in brain networks...
February 20, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334051/dissecting-the-relationships-of-igg-subclasses-and-complements-in-membranous-lupus-nephritis-and-idiopathic-membranous-nephropathy
#16
Woong Na, Kijong Yi, Young Soo Song, Moon Hyang Park
Membranous lupus nephritis (MLN) and idiopathic membranous nephropathy (IMN) are kidney diseases with similar morphology, but distinct etiologies, both producing glomeruli with immune deposits. Immunoglobulins and complements, the main components of the deposits, can be detected by immunofluorescence (IF) microscopy. Previous researches characterized the immune deposits only individually, but not the interactions between them. To study these relationships we analyzed an IF profile of IgG subclasses and complements (IgG1, IgG2, IgG3, IgG4, C3, C1q, and C4) in 53 and 95 cases of biopsy-confirmed MLNs and IMNs, respectively, mainly using information theory and Bayesian networks...
2017: PloS One
https://www.readbyqxmd.com/read/28333366/peer-influence-on-ethnic-racial-identity-development-a-multi-site-investigation
#17
Carlos E Santos, Olga Kornienko, Deborah Rivas-Drake
The peer context features prominently in theory, and increasingly in empirical research, about ethnic-racial identity (ERI) development, but no studies have assessed peer influence on ERI using methods designed to properly assess peer influence. We examined peer influence on ERI centrality, private, and public regard using longitudinal social network analysis. Data were drawn from two sites: a predominantly Latina/o Southwestern (SW) school (N = 1034; Mage = 12.10) and a diverse Midwestern (MW) school (N = 513; Mage = 11...
March 23, 2017: Child Development
https://www.readbyqxmd.com/read/28332691/relaxations-and-phase-transitions-during-the-collapse-of-a-dense-pnipam-microgel-suspension-thorough-insight-using-dielectric-spectroscopy
#18
Man Yang, Chunyan Liu, Yiwei Lian, Kongshuang Zhao, Dan Zhu, Jianfeng Zhou
The dielectric behavior of a thermo-sensitive poly-(N-isopropylacrylamide) (PNIPAM) microgel suspension with a dense concentration was investigated over the frequency range of 40 Hz to 110 MHz in a wide temperature window of 10-60 °C. By successfully removing the electrode polarization effect from the original data, two remarkable and temperature-dependent relaxation processes were observed. Both of the two-phase transition processes, i.e., the colloidal crystal-to-liquid transition, which has not yet been detected by dielectric spectroscopy before, as well as the volume phase transition, were detected by the relaxation parameters...
March 23, 2017: Soft Matter
https://www.readbyqxmd.com/read/28330614/a-predictive-3d-multi-scale-model-of-biliary-fluid-dynamics-in-the-liver-lobule
#19
Kirstin Meyer, Oleksandr Ostrenko, Georgios Bourantas, Hernan Morales-Navarrete, Natalie Porat-Shliom, Fabian Segovia-Miranda, Hidenori Nonaka, Ali Ghaemi, Jean-Marc Verbavatz, Lutz Brusch, Ivo Sbalzarini, Yannis Kalaidzidis, Roberto Weigert, Marino Zerial
Bile, the central metabolic product of the liver, is transported by the bile canaliculi network. The impairment of bile flow in cholestatic liver diseases has urged a demand for insights into its regulation. Here, we developed a predictive 3D multi-scale model that simulates fluid dynamic properties successively from the subcellular to the tissue level. The model integrates the structure of the bile canalicular network in the mouse liver lobule, as determined by high-resolution confocal and serial block-face scanning electron microscopy, with measurements of bile transport by intravital microscopy...
March 15, 2017: Cell Systems
https://www.readbyqxmd.com/read/28330457/exercising-alcohol-patients-don-t-lack-motivation-but-struggle-with-structures-emotions-and-social-context-a-qualitative-dropout-study
#20
Sengül Sari, Ashley Elizabeth Muller, Kirsten K Roessler
BACKGROUND: Exercise is an important component of a healthy lifestyle, the development of which is a relapse prevention strategy for those with alcohol use disorder. However, it is a challenge to create exercise interventions with a persistent behavioural change. The aim of this qualitative study was to investigate perceived barriers to participation in an exercise intervention among alcohol use disorder patients, who dropped out of the intervention program. Furthermore, this study aims to propose possibilities for a better practice of future intervention studies based on the participants' experiences and suggestions...
March 23, 2017: BMC Family Practice
keyword
keyword
105252
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"