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Spatial dependence analysis

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https://www.readbyqxmd.com/read/28635968/sex-biased-dispersal-creates-spatial-genetic-structure-in-a-parthenogenetic-ant-with-a-dependent-lineage-reproductive-system
#1
A Kuhn, D Bauman, H Darras, S Aron
Reproduction and dispersal are key aspects of species life history that influence spatial genetic structure in populations. Several ant species in the genus Cataglyphis have evolved a unique breeding system in which new reproductives (that is, queens and males) are produced asexually by parthenogenesis; in contrast, non-reproductives (that is, workers) are produced via sexual reproduction by mates from distinct genetic lineages. We investigated how these two coexisting reproductive methods affect population-level spatial genetic structure using the ant Cataglyphis mauritanica as a model...
June 21, 2017: Heredity
https://www.readbyqxmd.com/read/28634228/spatial-mapping-and-profiling-of-metabolite-distributions-during-germination
#2
Adam D Feenstra, Liza E Alexander, Zhihong Song, Andrew R Korte, Marna Yandeau-Nelson, Basil J Nikolau, Young-Jin Lee
Germination is a highly complex process by which seeds begin to develop and establish themselves as viable organisms. In this paper, we utilize a combination of GC-MS, LC-fluorescence, and mass spectrometry imaging (MSI) approaches to profile and visualize the metabolic distributions of germinating seeds from two different inbreds of maize seeds, B73 and Mo17. GC and LC analyses demonstrate that the two inbreds are highly differentiated in their metabolite profiles throughout the course of germination, especially with regard to amino acids, sugar alcohols, and small organic acids...
June 20, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28632457/the-bevps-a-new-test-battery-to-assess-visual-perceptual-and-spatial-processing-abilities-in-5-14-year-old-children
#3
Emilie Schmetz, Laurence Rousselle, Cécile Ballaz, Jean-Jacques Detraux, Koviljka Barisnikov
This study aims to examine the different levels of visual perceptual object recognition (early, intermediate, and late) defined in Humphreys and Riddoch's model as well as basic visual spatial processing in children using a new test battery (BEVPS). It focuses on the age sensitivity, internal coherence, theoretical validity, and convergent validity of this battery. French-speaking, typically developing children (n = 179; 5 to 14 years) were assessed using 15 new computerized subtests. After selecting the most age-sensitive tasks though ceiling effect and correlation analyses, an exploratory factorial analysis was run with the 12 remaining subtests to examine the BEVPS' theoretical validity...
June 20, 2017: Applied Neuropsychology. Child
https://www.readbyqxmd.com/read/28631320/spatial-patterns-and-broad-scale-weather-cues-of-beech-mast-seeding-in-europe
#4
Giorgio Vacchiano, Andrew Hacket-Pain, Marco Turco, Renzo Motta, Janet Maringer, Marco Conedera, Igor Drobyshev, Davide Ascoli
Mast seeding is a crucial population process in many tree species, but its spatio-temporal patterns and drivers at the continental scale remain unknown . Using a large dataset (8000 masting observations across Europe for years 1950-2014) we analysed the spatial pattern of masting across the entire geographical range of European beech, how it is influenced by precipitation, temperature and drought, and the temporal and spatial stability of masting-weather correlations. Beech masting exhibited a general distance-dependent synchronicity and a pattern structured in three broad geographical groups consistent with continental climate regimes...
July 2017: New Phytologist
https://www.readbyqxmd.com/read/28631117/multi-criteria-decision-analysis-to-model-ixodes-ricinus-habitat-suitability
#5
Raphaël Rousseau, Guy McGrath, Barry J McMahon, Sophie O Vanwambeke
Tick-borne diseases present a major threat to both human and livestock health throughout Europe. The risk of infection is directly related to the presence of its vector. Thereby it is important to know their distribution, which is strongly associated with environmental factors: the presence and availability of a suitable habitat, of a suitable climate and of hosts. The present study models the habitat suitability for Ixodes ricinus in Ireland, where data on tick distribution are scarce. Tick habitat suitability was estimated at a coarse scale (10 km) with a multi-criteria decision analysis (MCDA) method according to four different scenarios (depending on the variables used and on the weights granted to each of them)...
June 19, 2017: EcoHealth
https://www.readbyqxmd.com/read/28629778/posture-and-gaze-tracking-of-a-vertically-moving-target-reveals-age-related-constraints-in-visuo-motor-coupling
#6
H Sotirakis, A Kyvelidou, N Stergiou, V Hatzitaki
Previously we have demonstrated that the effect of aging on posture and gaze active tracking of a visual target moving in the horizontal direction is dependent on target's complexity. In this study, we asked whether a similar phenomenon is present when tracking a visual target moving with varying complexity in the vertical direction. Ten young (22.98±2.9years) and 10 older adults (72.45±4.72years) tracked for 120seconds, a visual target moving vertically by shifting their bodyweight in the anterior-posterior direction...
June 16, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28628849/kinematic-patterns-underlying-disguised-movements-spatial-and-temporal-dissimilarity-compared-to-genuine-movement-patterns
#7
Fabian Helm, Jörn Munzert, Nikolaus F Troje
This study examined the kinematic characteristics of disguised movements by applying linear discriminant (LDA) and dissimilarity analyses to the motion data from 788 disguised and 792 non-disguised 7-m penalty throws performed by novice and expert handball field players. Results of the LDA showed that discrimination between type of throws (disguised vs. non-disguised) was more error-prone when throws were performed by experts (spatial: 4.6%; temporal: 29.6%) compared to novices (spatial: 1.0%; temporal: 20...
June 16, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28627731/cell-migration-analysis-a-low-cost-laboratory-experiment-for-cell-and-developmental-biology-courses-using-keratocytes-from-fish-scales
#8
Daniel Prieto, Gonzalo Aparicio, Jose R Sotelo-Silveira
Cell and developmental processes are complex, and profoundly dependent on spatial relationships that change over time. Innovative educational or teaching strategies are always needed to foster deep comprehension of these processes and their dynamic features. However, laboratory exercises in cell and developmental biology at the undergraduate level do not often take into account the time dimension. In this article, we provide a laboratory exercise focused in cell migration, aiming to stimulate thinking in time and space dimensions through a simplification of more complex processes occurring in cell or developmental biology...
June 19, 2017: Biochemistry and Molecular Biology Education
https://www.readbyqxmd.com/read/28625344/confined-photonic-mode-propagation-observed-in-photoemission-electron-microscopy
#9
Theodore Stenmark, R C Word, R Könenkamp
Using photoemission electron microscopy (PEEM) we present a comparative analysis of the wavelength dependence of propagating fields in a simple optical slab waveguide and a thin film photonic crystal W1-type waveguide. We utilize an interferometric imaging approach for light in the near-ultraviolet regime where a 2-photon process is required to produce photoelectron emission. The typical spatial resolution in these experiments is < 30nm. Electromagnetic theory and finite element simulations are shown to be in good agreement with the experimental observations...
June 13, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28621586/the-cooler-code-a-novel-analytical-approach-to-calculate-subcellular-energy-deposition-by-internal-electron-emitters
#10
Mattia Siragusa, Giorgio Baiocco, Pil M Fredericia, Werner Friedland, Torsten Groesser, Andrea Ottolenghi, Mikael Jensen
COmputation of Local Electron Release (COOLER), a software program designed for dosimetry assessment at the cellular/subcellular scale, with a given distribution of administered low-energy electron-emitting radionuclides in cellular compartments, which remains a critical step in risk/benefit analysis for advancements in internal radiotherapy. The software is intended to overcome the main limitations of the medical internal radiation dose (MIRD) formalism for calculations of cellular S-values (i.e., dose to a target region in the cell per decay in a given source region), namely, the use of the continuous slowing down approximation (CSDA) and the assumption of a spherical cell geometry...
June 16, 2017: Radiation Research
https://www.readbyqxmd.com/read/28621427/adhfe1-a-novel-enzyme-involved-in-retinoic-acid-dependent-hox-activation
#11
Yehuda Shabtai, Natalie Shukrun, Abraham Fainsod
Retinoic acid (RA) signaling is a central pathway regulating anterior-posterior patterning of the embryo through its targets, the Hox genes. RA is produced by two sequential oxidations from vitamin A (retinol) and this biosynthesis has to be regulated temporally, spatially and quantitatively. Mining Xenopus embryonic expression databases identified a novel component of the RA metabolic network, ADHFe1. Using Xenopus laevis embryos as our experimental system we determined the temporal and spatial pattern of AdhFe1 expression...
2017: International Journal of Developmental Biology
https://www.readbyqxmd.com/read/28620383/ly6c-hi-monocytes-and-their-macrophage-descendants-regulate-neutrophil-function-and-clearance-in-acetaminophen-induced-liver-injury
#12
Nadine Graubardt, Milena Vugman, Odelia Mouhadeb, Gabriele Caliari, Metsada Pasmanik-Chor, Debby Reuveni, Ehud Zigmond, Eli Brazowski, Eyal David, Lousie Chappell-Maor, Steffen Jung, Chen Varol
Monocyte-derived macrophages (MoMF) play a pivotal role in the resolution of acetaminophen-induced liver injury (AILI). Timely termination of neutrophil activity and their clearance are essential for liver regeneration following injury. Here, we show that infiltrating Ly6C(hi) monocytes, their macrophage descendants, and neutrophils spatially and temporally overlap in the centrilobular necrotic areas during the necroinflammatory and resolution phases of AILI. At the necroinflammatory phase, inducible ablation of circulating Ly6C(hi) monocytes resulted in reduced numbers and fractions of reactive oxygen species (ROS)-producing neutrophils...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28618597/role-of-the-displacement-current-on-warburg-type-behavior
#13
I Lelidis, G Barbero
We investigate the role of the displacement current in the analysis of the electric response of an electrolytic cell to an external stimulus. We show that several models proposed to interpret the spectra deduced by means of the impedance spectroscopy technique are questionable. In particular, we demonstrate that even in the frequency range below the Debye frequency the role of the displacement current is fundamental, and its omission leads to incorrect results for the impedance of the cell. In our analysis, the boundary conditions on the bulk current density are of Nernstian and of Ohmic type...
May 2017: Physical Review. E
https://www.readbyqxmd.com/read/28618534/simultaneous-influence-of-helicity-and-compressibility-on-anomalous-scaling-of-the-magnetic-field-in-the-kazantsev-kraichnan-model
#14
E Jurčišinová, M Jurčišin, M Menkyna
Using the field theoretic renormalization group technique and the operator product expansion, the systematic investigation of the influence of the spatial parity violation on the anomalous scaling behavior of correlation functions of the weak passive magnetic field in the framework of the compressible Kazantsev-Kraichnan model with the presence of a large-scale anisotropy is performed up to the second order of the perturbation theory (two-loop approximation). The renormalization group analysis of the model is done and the two-loop explicit expressions for the anomalous and critical dimensions of the leading composite operators are found as functions of the helicity and compressibility parameters and their anisotropic hierarchies are discussed...
May 2017: Physical Review. E
https://www.readbyqxmd.com/read/28614695/sex-differences-in-aerobic-exercise-efficacy-to-improve-cognition-a-systematic-review-and-meta-analysis-of-studies-in-older-rodents
#15
REVIEW
Cindy K Barha, Ryan S Falck, Jennifer C Davis, Lindsay S Nagamatsu, Teresa Liu-Ambrose
Research in humans indicates that women may show greater cognitive benefits from aerobic training (AT) than men. To determine whether this sex difference extends to rodents, we conducted a systematic review and meta-analysis of studies in healthy, older rodents. Results indicate that compared to controls, AT improved hippocampus-dependent and -independent learning and memory. A sex difference was found with males showing larger benefits from AT on conditioned-avoidance and non-spatial memory tasks. AT also increased brain-derived neurotrophic factor compared to controls, with larger effects in females...
June 11, 2017: Frontiers in Neuroendocrinology
https://www.readbyqxmd.com/read/28613836/design-and-performance-of-a-novel-interface-for-combined-matrix-assisted-laser-desorption-ionization-at-elevated-pressure-and-electrospray-ionization-with-orbitrap-mass-spectrometry
#16
Mikhail E Belov, Shane R Ellis, Marialaura Dilillo, Martin R L Paine, William F Danielson, Gordon A Anderson, Eric L De Graaf, Gert B Eijkel, Ron M A Heeren, Liam A McDonnell
Matrix-Assisted Laser Desorption Ionization, MALDI, has been increasingly used in a variety of biomedical applications, including tissue imaging of clinical tissue samples, and in drug discovery and development. These studies strongly depend on the performance of the analytical instrumentation and would drastically benefit from improved sensitivity, reproducibility and mass / spatial resolution. In this work, we report on a novel combined MALDI/ESI interface, which was coupled to different Orbitrap mass spectrometers (Elite™ and Q Exactive™ Plus) and extensively characterized with peptide and protein standards, and in tissue imaging experiments...
June 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28613379/restoration-over-time-and-sustainability-of-schinus-terebinthifolius-raddi
#17
S V Álvares-Carvalho, R Silva-Mann, I B Gois, M F V Melo, A S Oliveira, R A Ferreira, L J Gomes
The success of recovery programs on degraded areas is dependent on the genetic material to be used, which should present heterozygosity and genetic diversity in native and recovered populations. This study was carried out to evaluate the model efficiency to enable the recovery of a degraded area of the Lower São Francisco, Sergipe, Brazil. The target species for this study was Schinus terebinthifolius Raddi. Three populations were analyzed, the recovered area, seed-tree source population, and native tree population border established to the recovered area...
May 31, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28611450/investigation-of-electric-field-induced-mixing-in-silicon-micro-ring-resonators
#18
Francesco De Leonardis, Richard A Soref, Vittorio M N Passaro
In this paper we present a detailed theoretical investigation of the electric field induced mixing effect, in which the up and down frequency-conversion processes are obtained by inducing an effective second order susceptibility via the periodic spatial distribution of reversed biased p-i-n junctions. The possibility of realizing a frequency generation process within an integrated microring resonator is demonstrated here, by simulations, in the silicon on insulator platform. Furthermore, general physical features have been investigated by means of a comparative analysis of the frequency generation performance as a function of the input pump power, the linear and nonlinear losses, and the coupling factors...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28606179/modifying-upper-limb-inter-joint-coordination-in-healthy-subjects-by-training-with-a-robotic-exoskeleton
#19
Tommaso Proietti, Emmanuel Guigon, Agnès Roby-Brami, Nathanaël Jarrassé
BACKGROUND: The possibility to modify the usually pathological patterns of coordination of the upper-limb in stroke survivors remains a central issue and an open question for neurorehabilitation. Despite robot-led physical training could potentially improve the motor recovery of hemiparetic patients, most of the state-of-the-art studies addressing motor control learning, with artificial virtual force fields, only focused on the end-effector kinematic adaptation, by using planar devices...
June 12, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28605251/influence-of-pedestrians-age-and-gender-types-on-spatial-and-temporal-distribution-of-pedestrian-crashes
#20
Alireza Toran Pour, Sara Moridpour, Richard Tay, Abbas Rajabifard
OBJECTIVES: Every year, about 1.24 million people are killed in traffic crashes in the world and more than 22% of these deaths are pedestrians. Therefore, pedestrian safety has become one of the significant traffic safety issues in the world. In order to develop effective and targeted safety programs, the location and time-specific influences on vehicle-pedestrian crashes must be assessed. The main purpose of this research is to explore the influence of pedestrians' age and gender on the temporal and spatial distribution of vehicle-pedestrian crashes to identify the hotspots and hot-times...
June 12, 2017: Traffic Injury Prevention
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