keyword
MENU ▼
Read by QxMD icon Read
search

Theory

keyword
https://www.readbyqxmd.com/read/28324972/analysis-of-spontaneous-eeg-activity-in-alzheimer-s-disease-using-cross-sample-entropy-and-graph-theory
#1
Carlos Gomez, Jesus Poza, Javier Gomez-Pilar, Alejandro Bachiller, Celia Juan-Cruz, Miguel A Tola-Arribas, Alicia Carreres, Monica Cano, Roberto Hornero
The aim of this pilot study was to analyze spontaneous electroencephalography (EEG) activity in Alzheimer's disease (AD) by means of Cross-Sample Entropy (Cross-SampEn) and two local measures derived from graph theory: clustering coefficient (CC) and characteristic path length (PL). Five minutes of EEG activity were recorded from 37 patients with dementia due to AD and 29 elderly controls. Our results showed that Cross-SampEn values were lower in the AD group than in the control one for all the interactions among EEG channels...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324955/identifying-important-regions-in-eeg-epilepsy-brain-networks
#2
Nantia D Iakovidou, Manolis Christodoulakis, Eleftherios S Papathanasiou, Savvas S Papacostas, Georgios D Mitsis
The human brain has been called the most complex object in the known universe and in many ways it constitutes the final frontier of science. Lately, the functional connectivity in human brain has been regarded and studied as a complex network using electroencephalography (EEG) signals. This means that the brain is studied as a connected system, where nodes represent different specialized brain regions and links or connections, represent communication pathways between the nodes. It is also fairly established that graph theory provides a variety of measures, methods and tools that can be useful to efficiently model, analyze and study an EEG network...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324857/homoagglomeration-and-heteroagglomeration-of-tio2-in-nanoparticle-and-bulk-form-onto-freshwater-and-marine-microalgae
#3
M Sendra, M P Yeste, J M Gatica, I Moreno-Garrido, J Blasco
TiO2 nanoparticles (TiO2 NPs) are employed in many products (paints, personal care products, especially sunscreens, plastics, paper, water potabilization and food products) and are then released into the environment from these products. These nanoparticles present potential risk to freshwater and marine microalgae. The primary toxicity mechanism is adsorption between NPs and microalgae (heteroagglomeration); however, studies of interactions of this kind are scarce. We investigated the heteroagglomeration process that occurs between two forms of TiO2 material, nanoparticles and bulk, and three different microalgae species, and under different environmental conditions (freshwater and marine water), in order to assess the influence of pH and ionic strength (IS)...
March 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28324794/the-socio-political-context-of-migration-and-reproductive-health-disparities-the-case-of-early-sexual-initiation-among-mexican-origin-immigrant-young-women
#4
Kate Coleman-Minahan
Prior research often explains the lower risk of early sexual initiation among foreign-born Mexican-origin young women by a patriarchal and sexually conservative "traditional Latino culture." This definition overlooks structural factors such as exploitation of migrant workers, and conflates gender inequality and sexual expectations. I use an intersectional framework and the theory of gender and power to explore how gender inequality and sexual expectations are both influenced by structural factors and affect reproductive health outcomes...
March 9, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28324759/stability-and-instability-of-a-neuron-network-with-excitatory-and-inhibitory-small-world-connections
#5
Dongyuan Yu, Xu Xu, Jing Zhou, Eric Li
This study considers a delayed neural network with excitatory and inhibitory shortcuts. The global stability of the trivial equilibrium is investigated based on Lyapunov's direct method and the delay-dependent criteria are obtained. It is shown that both the excitatory and inhibitory shortcuts decrease the stability interval, but a time delay can be employed as a global stabilizer. In addition, we analyze the bounds of the eigenvalues of the adjacent matrix using matrix perturbation theory and then obtain the generalized sufficient conditions for local stability...
March 2, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28324756/na-ion-batteries-based-on-the-inorganic-bn-nanocluster-anodes-dft-studies
#6
K Nejati, A Hosseinian, A Bekhradnia, E Vessally, L Edjlali
It has been recently indicated that the Li-ion batteries may be replaced by Na-ion batteries because of their low safety, high cost, and low-temperature performance, and lack of the Li mineral reserves. Here, using density functional theory calculations, we studied the potential application of B12N12 nanoclusters as anode in Na-ion batteries. Our calculations indicate that the adsorption energy of Na(+) and Na are about -23.4 and -1.4kcal/mol, respectively, and the pristine BN cage to improve suffers from a low cell voltage (∼0...
March 6, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28324694/screening-of-autism-based-on-task-free-fmri-using-graph-theoretical-approach
#7
Masoumeh Sadeghi, Reza Khosrowabadi, Fatemeh Bakouie, Hoda Mahdavi, Changiz Eslahchi, Hamidreza Pouretemad
Studies on autism spectrum disorder (ASD) have indicated several dysfunctions in the structure, and functional organization of the brain. However, findings have not been established as a general diagnostic tool yet. In this regard, current study proposed an automatic screening method for recognition of ASDs from healthy controls (HCs) based on their brain functional abnormalities. In this paradigm, brain functional networks of 60 adolescent and young adult males (29 ASDs and 31 HCs) were estimated from subjects' task-free fMRI data...
March 9, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28324690/e-coli-interactions-adhesion-and-transport-in-alumino-silica-clays
#8
Houzhen Wei, Guang Yang, Boya Wang, Runwei Li, Gang Chen, Zhenze Li
Bacterial adhesion and transport in the geological formation are controlled by their mutual complex interactions, which have been quantified by the traditional and extended Derjaguin-Landau-Verwey-Overbeek (DLVO) theory as well as direct atomic force microscopy (AFM) measurements. In this research, the DLVO forces calculated based on the independently determined bacterial and porous media surface thermodynamic properties were compared with those of AFM measurements. Although differences in the order of several magnitudes existed, forces obtained from both ways could explain the observations of E...
March 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28324685/monitoring-and-descriptive-analysis-of-radon-in-relation-to-seismic-activity-of-northern-pakistan
#9
Zeeshan Jilani, Tahir Mehmood, Aftab Alam, Muhammad Awais, Talat Iqbal
Earthquakes are one of the major causes of natural disasters and its forecasting is challenging task. Some precursory phenomenon exists in theory in relation to earthquakes occurrence. The emission of radioactive gas named 'radon' before the earthquakes is a potential earthquake precursory candidate. The study aims to monitor and to analyze the radon in relation to seismic activity in Northern Pakistan. For this purpose RTM-2200 has been used to monitor the changes in radon concentration from August 01, 2014 to January 31, 2015 in Northern Pakistan...
March 16, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28324651/line-activity-of-ganglioside-gm1-regulates-raft-size-distribution-in-a-cholesterol-dependent-manner
#10
Timur R Galimzyanov, Anna S Lyushnyak, Veronika V Aleksandrova, Liudmila A Shilova, Ilya I Mikhalyov, Irina M Molotkovskaya, Sergey A Akimov, Oleg V Batishchev
Liquid-ordered lipid domains, also called rafts, are assumed to be important players in different cellular processes, mainly signal transduction and membrane trafficking. They are thicker than the disordered part of the membrane and are thought to form for compensating the hydrophobic mismatch between transmembrane proteins and lipid environment. Despite the existence of such structures in vivo is still an open question, they are observed in model systems of multicomponent lipid bilayers. Moreover, the predictions obtained from model experiments allow explaining different physiological processes possibly involving rafts...
March 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28324321/structured-data-entry-in-the-electronic-medical-record-perspectives-of-pediatric-specialty-physicians-and-surgeons
#11
Ruth A Bush, Cynthia Kuelbs, Julie Ryu, Wen Jiang, George Chiang
The Epic electronic health record (EHR) platform supports structured data entry systems (SDES), which allow developers, with input from users, to create highly customized patient-record templates in order to maximize data completeness and to standardize structure. There are many potential advantages of using discrete data fields in the EHR to capture data for secondary analysis and epidemiological research, but direct data acquisition from clinicians remains one of the largest obstacles to leveraging the EHR for secondary use...
May 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28324254/pilot-testing-model-to-uncover-industrial-symbiosis-in-brazilian-industrial-clusters
#12
Adriana Valélia Saraceni, Luis Mauricio Resende, Pedro Paulo de Andrade Júnior, Joseane Pontes
The main objective of this study was to create a pilot model to uncover industrial symbiosis practices in Brazilian industrial clusters. For this purpose, a systematic revision was conducted in journals selected from two categories of the ISI Web of Knowledge: Engineering, Environmental and Engineering, Industrial. After an in-depth revision of literature, results allowed the creation of an analysis structure. A methodology based on fuzzy logic was applied and used to attribute the weights of industrial symbiosis variables...
March 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28324249/evaluation-of-organic-amendment-on-the-effect-of-cadmium-bioavailability-in-contaminated-soils-using-the-dgt-technique-and-traditional-methods
#13
EDITORIAL
Yu Yao, Qin Sun, Chao Wang, Pei-Fang Wang, Shi-Ming Ding
Organic amendments have been widely proposed as a remediation technology for metal-contaminated soils, but there exist controversial results on their effectiveness. In this study, the effect of pig manure addition on cadmium (Cd) bioavailability in Cd-contaminated soils was systematically evaluated by one dynamic, in situ technique of diffusive gradients in thin films (DGT) and four traditional methods based on the equilibrium theory (soil solution concentration and the three commonly used extractants, i.e...
March 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28324136/the-inimitable-mouth-task-dependent-kinematic-differences-are-independent-of-terminal-precision
#14
Jason W Flindall, Claudia L R Gonzalez
Previous studies in our lab have described kinematic difference between grasp-to-eat and grasp-to-place movements, whereby participants produce smaller maximum grip apertures (MGAs) when grasping to bring the item to the mouth than when grasping to bring the item to a container near the mouth. This task difference is limited to right-handed movements, regardless of handedness; it has, therefore, been interpreted as evidence of left-hemisphere lateralization of the grasp-to-eat and other hand-to-mouth grasping movements...
March 21, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28323877/thermal-analysis-during-partial-carbonizing-process-of-rhubarb-moutan-and-burnet
#15
Junnan Ma, Xianglong Meng, Xiaohui Guo, Yaru Lan, Shuosheng Zhang
Control of temperature and duration of partial carbonization for Chinese medicines have been mainly based on experience of the processors. No quantitative methods and parameters are available that can be used to precisely control the temperature and determine the energy changes during the process. In our research, with a simulated atmosphere air condition, the partial carbonization processes of three Chinese herb medicines rhubarb, moutan and burnet were simulated at different heating rates (5, 10 and 20°C • min-1) and analyzed by thermal gravimetric analysis (TGA) to quantify the upper limits of the temperature...
2017: PloS One
https://www.readbyqxmd.com/read/28323846/problems-identified-by-dual-sensory-impaired-older-adults-in-long-term-care-when-using-a-self-management-program-a-qualitative-study
#16
Lieve Roets-Merken, Sytse Zuidema, Myrra Vernooij-Dassen, Marianne Dees, Pieter Hermsen, Gertrudis Kempen, Maud Graff
OBJECTIVE: To gain insights into the problems of dual sensory impaired older adults in long-term care. Insights into these problems are essential for developing adequate policies which address the needs of the increasing population of dual sensory impaired older adults in long-term care. METHODS: A qualitative study was conducted in parallel with a cluster randomized controlled trial. Dual sensory impaired older adults in the intervention group (n = 47, age range 82-98) were invited by a familiar nurse to identify the problems they wanted to address...
2017: PloS One
https://www.readbyqxmd.com/read/28323782/controversies-in-intrapatient-melanoma-brafv600e-mutation-status
#17
Erica Riveiro-Falkenbach, Angel Santos-Briz, Juan J Ríos-Martín, José L Rodríguez-Peralto
Therapies targeting the BRAF oncogene have improved the overall and disease-free survival of patients with advanced melanomas. An unresolved issue in clinical practice is the existence (or not) of BRAF-mutated and BRAF-nonmutated tumors in individual patients (intrapatient BRAF mutation heterogeneity), which may serve as a mechanism of resistance to BRAF inhibitors or lead to diagnostic problems. Different research groups have reported differing results after analyzing the BRAF mutation statuses of multiple melanoma tumors...
April 2017: American Journal of Dermatopathology
https://www.readbyqxmd.com/read/28323661/suicidal-ideation-and-psychological-strain-among-patients-diagnosed-with-stomach-cancer-the-mediation-of-psychopathological-factors
#18
Xuekun Zhang, Jie Zhang, Nicholas Procter, Xiaoyun Chen, Yonggang Su, Fenglan Lou, Fenglin Cao
Patients with stomach cancer are at high risk to experience suicidal ideation. Strain theory of suicide assumes that suicide is preceded by psychological strain. Despite wide international acceptance of the theory, its use with a sample of patients with stomach cancer has not previously been reported. The aims were to examine the relationship between psychological strain and suicidal ideation among patients with stomach cancer and to determine whether psychopathological factors act as mediators. A cross-sectional study was undertaken involving subjects with no history of mental disorder, and questionnaires were administered by face-to-face interview...
March 20, 2017: Journal of Nervous and Mental Disease
https://www.readbyqxmd.com/read/28323635/magnetic-states-of-mnp-muon-spin-rotation-studies
#19
R Khasanov, A Amato, P Bonfà, Z Guguchia, H Luetkens, E Morenzoni, R De Renzi, N D Zhigadlo
Muon-spin rotation data collected at ambient pressure (p) and at p  =  2.42 GPa in MnP were analyzed to check their consistency with various low- and high-pressure magnetic structures reported in the literature. Our analysis confirms that in MnP the low-temperature and low-pressure helimagnetic phase is characterised by an increased value of the average magnetic moment compared to the high-temperature ferromagnetic phase. An elliptical double-helical structure with a propagation vector [Formula: see text], an a-axis moment elongated by approximately 18% and an additional tilt of the rotation plane towards c-direction by [Formula: see text]-8° leads to a good agreement between the theory and the experiment...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28323633/rotational-magneto-acousto-electric-tomography-maet-theory-and-experimental-validation
#20
L Kunyansky, C P Ingram, R S Witte
We present a novel two-dimensional (2D) MAET scanner, with a rotating object of interest and two fixed pairs of electrodes. Such an acquisition scheme, with our novel reconstruction techniques, recovers the boundaries of the regions of constant conductivity uniformly well, regardless of their orientation. We also present a general image reconstruction algorithm for the 2D MAET in a circular chamber with point-like electrodes immersed into the saline surrounding the object. An alternative linearized reconstruction procedure is developed, suitable for recovering the material interfaces (boundaries) when a non-ideal piezoelectric transducer is used for acoustic excitation...
March 21, 2017: Physics in Medicine and Biology
keyword
keyword
82782
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"