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https://www.readbyqxmd.com/read/28448569/dynamics-and-complexity-of-body-temperature-in-preterm-infants-nursed-in-incubators
#1
Kerstin Jost, Isabelle Pramana, Edgar Delgado-Eckert, Nitin Kumar, Alexandre N Datta, Urs Frey, Sven M Schulzke
BACKGROUND: Poor control of body temperature is associated with mortality and major morbidity in preterm infants. We aimed to quantify its dynamics and complexity to evaluate whether indices from fluctuation analyses of temperature time series obtained within the first five days of life are associated with gestational age (GA) and body size at birth, and presence and severity of typical comorbidities of preterm birth. METHODS: We recorded 3h-time series of body temperature using a skin electrode in incubator-nursed preterm infants...
2017: PloS One
https://www.readbyqxmd.com/read/28448406/two-dimensional-spoiled-gradient-recalled-echo-magnetic-resonance-imaging-of-the-liver-using-respiratory-navigator-gating-techniques
#2
Yusuke Inoue, Hirofumi Hata, Keiji Matsunaga, Ai Nakajima, Shotaro Komi, Yutaka Abe, Hiroki Miyatake
OBJECTIVE: We assessed the feasibility of T1-weighted 2-dimensional spoiled gradient-recalled (2D SPGR) acquisition in steady-state imaging of the liver with various respiratory navigator gating techniques. METHODS: A total of 12 healthy volunteers underwent in-phase and out-of-phase 2D SPGR imaging of the liver during breath-holding and free-breathing. Four techniques for respiratory navigation, 2 conventional navigator techniques and 2 self-navigator techniques, were used for free-breathing imaging...
April 26, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28447220/track-weighted-dynamic-functional-connectivity-tw-dfc-a-new-method-to-study-time-resolved-functional-connectivity
#3
Fernando Calamante, Robert E Smith, Xiaoyun Liang, Andrew Zalesky, Alan Connelly
Interest in the study of brain connectivity is growing, particularly in understanding the dynamics of the structural/functional connectivity relation. Structural and functional connectivity are most often analysed independently of each other. Track-weighted functional connectivity (TW-FC) was recently proposed as a means to combine structural/functional connectivity information into a single image. We extend here TW-FC in two important ways: first, all the functional data are used without having to define a prior functional network (cf...
April 26, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28442789/elastic-turbulence-in-entangled-semi-dilute-dna-solutions-measured-with-optical-coherence-tomography-velocimetry
#4
A V Malm, T A Waigh
The flow instabilities of solutions of high molecular weight DNA in the entangled semi-dilute concentration regime were investigated using optical coherence tomography velocimetry, a technique that provides high spatial (probe volumes of 3.4 pL) and temporal resolution (sub μs) information on the flow behaviour of complex fluids in a rheometer. The velocity profiles of the opaque DNA solutions (high and low salt) were measured as a function of the distance across the gap of a parallel plate rheometer, and their evolution over time was measured...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28441445/impact-of-aberrant-cerebral-perfusion-on-resting-state-functional-mri-a-preliminary-investigation-of-moyamoya-disease
#5
Yituo Wang, Lubin Wang, Penggang Qiao, Fugeng Sheng, Cong Han, Enmao Ye, Yu Lei, Feng Yan, Shanshan Chen, Yuyang Zhu, Guiyun Mi, Gongjie Li, Zheng Yang
The impact of chronic cerebral hypoperfusion on resting-state blood oxygen level-dependent signal fluctuations remains unknown. We aimed to determine whether chronic ischemia induces changes in amplitude of low-frequency fluctuations (ALFF) and to investigate the correlation between ALFF and perfusion-weighted magnetic resonance imaging (PWI) parameters in patients with moyamoya disease (MMD). Thirty patients with pre- and postoperative resting-state functional magnetic resonance imaging and PWI were included, and thirty normal controls underwent resting-state functional magnetic resonance imaging...
2017: PloS One
https://www.readbyqxmd.com/read/28439014/brain-networks-for-confidence-weighting-and-hierarchical-inference-during-probabilistic-learning
#6
Florent Meyniel, Stanislas Dehaene
Learning is difficult when the world fluctuates randomly and ceaselessly. Classical learning algorithms, such as the delta rule with constant learning rate, are not optimal. Mathematically, the optimal learning rule requires weighting prior knowledge and incoming evidence according to their respective reliabilities. This "confidence weighting" implies the maintenance of an accurate estimate of the reliability of what has been learned. Here, using fMRI and an ideal-observer analysis, we demonstrate that the brain's learning algorithm relies on confidence weighting...
April 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28430489/absence-of-a-large-superconductivity-induced-gap-in-magnetic-fluctuations-of-sr_-2-ruo_-4
#7
S Kunkemöller, P Steffens, P Link, Y Sidis, Z Q Mao, Y Maeno, M Braden
Inelastic neutron scattering experiments on Sr_{2}RuO_{4} determine the spectral weight of the nesting induced magnetic fluctuations across the superconducting transition. There is no observable change at the superconducting transition down to an energy of ∼0.35  meV, which is well below the 2Δ values reported in several tunneling experiments. At this and higher energies magnetic fluctuations clearly persist in the superconducting state. Only at energies below ∼0.3  meV can evidence for partial suppression of spectral weight in the superconducting state be observed...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28429353/roles-of-the-nrf2-ho-1-pathway-in-the-anti-oxidative-stress-response-to-ischemia-reperfusion-brain-injury-in-rats
#8
L-J Jiang, S-M Zhang, C-W Li, J-Y Tang, F-Y Che, Y-C Lu
OBJECTIVE: The aim of this study was to investigate the roles of the Nrf2/HO-1 pathway in the responses to the oxidative stress created by ischemia-reperfusion brain injury in rats. MATERIALS AND METHODS: 54 healthy, adult, male SD rats were included in the study. Eighteen (18) rats were placed in the sham group. The ischemia-reperfusion model was created in the other 36 rats, among which 18 received injections of Nrf2 agonist before the surgery. The suture method was used to create artery occlusions in the right brain of the rats; and reperfusion was done after 90-minute ischemia (MCAO); while no suture was inserted in the sham group...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28421854/reduction-of-bold-interference-in-pseudo-continuous-arterial-spin-labeling-towards-quantitative-fmri
#9
Geoffrey Warnock, Pinar S Özbay, Felix P Kuhn, Daniel Nanz, Alfred Buck, Andreas Boss, Cristina Rossi
Fluctuations in blood-oxygenation level dependent (BOLD) signal and perfusion affect the quantification of changes in cerebral blood flow (CBF), coupled to neuronal activity, in arterial spin labeling (ASL). Subtraction methods for control and labeled MR images (i.e. pair-wise, surround subtraction, and subtraction of sinc-interpolated images), postulated to mitigate this interference in pseudo-continuous ASL (pCASL), were evaluated by comparison with quantitative (15)O-water PET. At rest, a good agreement in the CBF values was found between PET and MRI for each of the subtraction methods...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28415188/universality-classes-of-fluctuation-dynamics-in-hierarchical-complex-systems
#10
A M S Macêdo, Iván R Roa González, D S P Salazar, G L Vasconcelos
A unified approach is proposed to describe the statistics of the short-time dynamics of multiscale complex systems. The probability density function of the relevant time series (signal) is represented as a statistical superposition of a large time-scale distribution weighted by the distribution of certain internal variables that characterize the slowly changing background. The dynamics of the background is formulated as a hierarchical stochastic model whose form is derived from simple physical constraints, which in turn restrict the dynamics to only two possible classes...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28405457/factors-for-improving-reproductive-performance-of-sows-and-herd-productivity-in-commercial-breeding-herds
#11
REVIEW
Yuzo Koketsu, Satomi Tani, Ryosuke Iida
We review critical factors associated with reproductive performance of female breeding pigs, their lifetime performance and herd productivity in commercial herds. The factors include both sow-level and herd-level factors. High risk sow-level groups for decreasing reproductive performance of female pigs are low or high parity, increased outdoor temperature, decreased lactation feed intake, single inseminations, increased lactation length, prolonged weaning-to-first-mating interval, low birth weight or low preweaning growth rate, a few pigs born alive at parity 1, an increased number of stillborn piglets, foster-in or nurse sow practices and low or high age at first-mating...
2017: Porcine Health Management
https://www.readbyqxmd.com/read/28397119/seasonal-assessment-of-biological-indices-bioaccumulation-and-bioavailability-of-heavy-metals-in-sea-urchins-paracentrotus-lividus-from-algerian-west-coast-applied-to-environmental-monitoring
#12
Omar Rouane-Hacene, Zitouni Boutiba, Meriem Benaissa, Benkhedda Belhaouari, Patrice Francour, Marielle E Guibbolini-Sabatier, Christine Risso-De Faverney
The aim of the present work was to extend our knowledge on the variability of trace metals in sea urchin tissues, focusing on seasonal fluctuations (2010 February for "winter," May for "spring," August for "summer," November for "autumn") in the three different sampling sites of Algerian west coast (Oran Harbor (S1), Ain Defla (S2), and Hadjaj (belonging to Mostaganem City S3)). For this purpose, the bioavailability (metal indices) and bioaccumulation (metal concentrations in soft tissues) of heavy metals (Zn, Cu, Pb, and Cd), the physiological characteristics (e...
April 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28379800/body-weight-fluctuations-and-outcomes-in-coronary-disease
#13
RANDOMIZED CONTROLLED TRIAL
Sripal Bangalore, Rana Fayyad, Rachel Laskey, David A DeMicco, Franz H Messerli, David D Waters
BACKGROUND: Body-weight fluctuation is a risk factor for death and coronary events in patients without cardiovascular disease. It is not known whether variability in body weight affects outcomes in patients with coronary artery disease. METHODS: We determined intraindividual fluctuations in body weight from baseline weight and follow-up visits and performed a post hoc analysis of the Treating to New Targets trial, which involved assessment of the efficacy and safety of lowering low-density lipoprotein cholesterol levels with atorvastatin...
April 6, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28375317/interaction-of-aberrations-diffraction-and-quantal-fluctuations-determine-the-impact-of-pupil-size-on-visual-quality
#14
Renfeng Xu, Huachun Wang, Larry N Thibos, Arthur Bradley
Our purpose is to develop a computational approach that jointly assesses the impact of stimulus luminance and pupil size on visual quality. We compared traditional optical measures of image quality and those that incorporate the impact of retinal illuminance dependent neural contrast sensitivity. Visually weighted image quality was calculated for a presbyopic model eye with representative levels of chromatic and monochromatic aberrations as pupil diameter was varied from 7 to 1 mm, stimulus luminance varied from 2000 to 0...
April 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28364677/forecasting-stochastic-neural-network-based-on-financial-empirical-mode-decomposition
#15
Jie Wang, Jun Wang
In an attempt to improve the forecasting accuracy of stock price fluctuations, a new one-step-ahead model is developed in this paper which combines empirical mode decomposition (EMD) with stochastic time strength neural network (STNN). The EMD is a processing technique introduced to extract all the oscillatory modes embedded in a series, and the STNN model is established for considering the weight of occurrence time of the historical data. The linear regression performs the predictive availability of the proposed model, and the effectiveness of EMD-STNN is revealed clearly through comparing the predicted results with the traditional models...
March 18, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28357138/growth-of-infants-with-intestinal-failure-or-feeding-intolerance-does-not-follow-standard-growth-curves
#16
Danielle L Morton, Keli M Hawthorne, Carolyn E Moore
Objective. Infants with intestinal failure or feeding intolerance are nutritionally compromised and are at risk for extrauterine growth restriction. The aim of the study was to evaluate growth velocities of infants with intestinal failure and feeding intolerance for the first three months of age and to determine growth percentiles at birth and at 40-week postmenstrual age (PMA). Methods. A chart review of infants followed by the Texas Children's Hospital Intestinal Rehabilitation Team was conducted from April 2012 to October 2014...
2017: Journal of Nutrition and Metabolism
https://www.readbyqxmd.com/read/28355092/acute-toxicity-and-cytotoxicity-of-pereskia-aculeata-a-highly-nutritious-cactaceae-plant
#17
Debora O Silva, Mauricio Seifert, Fabiana R Nora, Vera L Bobrowski, Rogerio A Freitag, Heidi R Kucera, Leonardo Nora, Nilesh W Gaikwad
Pereskia aculeata is a Cactaceae plant with valuable nutritional properties, including terrific amounts of protein, minerals, vitamins, and fiber. However, P. aculeata is reported to contain antinutrients and alkaloids in its leaves. In addition, in a study on growth and development, Wistar rats fed with P. aculeata and casein as protein source grew less than the control group (fed with casein only). Therefore, in this study, we evaluated, for the first time, the oral acute toxicity of P. aculeata in rats and also the cytotoxicity behavior of the plant on lettuce seeds...
April 2017: Journal of Medicinal Food
https://www.readbyqxmd.com/read/28345583/synergistic-effects-of-micro-electrolysis-photocatalysis-on-water-treatment-and-fish-performance-in-saline-recirculating-aquaculture-system
#18
Zhangying Ye, Shuo Wang, Weishan Gao, Haijun Li, Luowei Pei, Mingwei Shen, Songming Zhu
A new physico-chemical process for TAN (total ammonia nitrogen) removal and disinfection is introduced in saline recirculating aquaculture system (RAS), in which the biofilter is replaced with an integrated electrolysis cell and an activated carbon filter. The electrolysis cell which is based on micro current electrolysis combined with UV-light was self-designed. After the fundamental research, a small pilot scale RAS was operated for 30 days to verify the technical feasibility. The system was stocked by 42 GIFT tilapia (Oreochromis niloticus) fish with the rearing density of 13 kg/m(3)...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28343116/health-and-weight-gender-specific-linkages-under-heterogeneity-interdependence-and-resilience-factors
#19
Olaf Hübler
Many studies have shown that obesity is a serious health problem for our society. Empirical analyses often neglect a number of methodological issues and relevant influences on health. This paper investigates empirically whether neglecting these items leads to systematically different estimates. Based on data from the German Socio-Economic Panel, this study derives the following results. (1) Many combinations of weight and height lead to the same health status. (2) The relationship between health and body mass index is nonlinear...
March 11, 2017: Economics and Human Biology
https://www.readbyqxmd.com/read/28342651/from-classical-to-nonparametric-growth-models-towards-comprehensive-modelling-of-mussel-growth-patterns
#20
Isabel Fuentes-Santos, Uxío Labarta, Kristina Arranz, Mª José Fernández-Reiriz
Understanding biological processes, such as growth, is crucial to development management and sustainability plans for bivalve populations. Von Bertalanffy and Gompertz models have been commonly used to fit bivalve growth. These models assume that individual growth is only determined by size, overlooking the effects of environmental and intrinsic conditions on growth patterns. The comparison between classical models and nonparametric GAM (generalized additive models) fits conducted in this work shows that the latter provide a more realistic approach of mussel growth measured in terms of shell length, and dry weight of hard and soft tissues...
March 18, 2017: Marine Environmental Research
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