keyword
MENU ▼
Read by QxMD icon Read
search

Spatial

keyword
https://www.readbyqxmd.com/read/27936500/sodium-co-limits-and-catalyzes-macronutrients-in-a-prairie-food-web
#1
Michael Kaspari, Karl A Roeder, Brittany Benson, Michael D Weiser, Nathan Sanders
Nitrogen and phosphorus frequently limit terrestrial plant production, but have a mixed record in regulating the abundance of terrestrial invertebrates. We contrasted four ways that Na could interact with an NP fertilizer to shape the plants and invertebrates of an inland prairie. We applied NP and Na to m(2) plots in a factorial design. Aboveground invertebrate abundance was independently co-limited by NaCl and NP, but with +NP plots supporting more individuals. We suggest the disparity arises because NP enhanced plant height by 35% (1SD) over controls, providing both food and habitat while NaCl provides only food...
December 9, 2016: Ecology
https://www.readbyqxmd.com/read/27936498/invasive-exotic-shrub-modifies-a-classic-animal-habitat-relationship-and-alters-patterns-of-vertebrate-seed-predation
#2
Peter W Guiden, John L Orrock
Recent evidence suggests that invasive exotic plants can provide novel habitats that alter animal behavior. However, it remains unclear whether classic animal-habitat associations that influence the spatial distribution of plant-animal interactions, such as small mammal use of downed woody debris, persist in invaded habitats. We removed an invasive exotic shrub (buckthorn, Rhamnus cathartica) from 7 of 15 plots in Wisconsin. In each plot, we deployed 200 tagged Quercus rubra seeds in November 2014. After five months, tags were recovered to track spatial patterns of small mammal seed predation...
December 9, 2016: Ecology
https://www.readbyqxmd.com/read/27936274/spatiotopic-buildup-of-saccade-target-representation-depends-on-target-size
#3
Eckart Zimmermann
How we maintain spatial stability across saccade eye movements is an open question in visual neuroscience. A phenomenon that has received much attention in the field is our seemingly poor ability to discriminate the direction of transsaccadic target displacements. We have recently shown that discrimination performance increases the longer the saccade target has been previewed before saccade execution (Zimmermann, Morrone, & Burr, 2013). We have argued that the spatial representation of briefly presented stimuli is weak but that a strong representation is needed for transsaccadic, i...
December 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/27936271/multiple-stage-ambiguity-in-motion-perception-reveals-global-computation-of-local-motion-directions
#4
Andrew T Rider, Shin'ya Nishida, Alan Johnston
The motion of a 1D image feature, such as a line, seen through a small aperture, or the small receptive field of a neural motion sensor, is underconstrained, and it is not possible to derive the true motion direction from a single local measurement. This is referred to as the aperture problem. How the visual system solves the aperture problem is a fundamental question in visual motion research. In the estimation of motion vectors through integration of ambiguous local motion measurements at different positions, conventional theories assume that the object motion is a rigid translation, with motion signals sharing a common motion vector within the spatial region over which the aperture problem is solved...
December 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/27936247/land-use-and-socioeconomic-change-medicinal-plant-selection-and-biodiversity-resilience-in-far-western-nepal
#5
Ripu M Kunwar, Kedar Baral, Prashant Paudel, Ram P Acharya, Khum B Thapa-Magar, Mary Cameron, Rainer W Bussmann
Indigenous plant use-systems have evolved under, and constantly adapted to human and non-human impacts. In the last decades however, increasing socioeconomic and cultural transformations, including land-use change, outmigration, globalized markets, the introduction of new species, and climate change have led to a decreasing availability of indigenous resources, and are ultimately leading to a reduction of local use-knowledge. Participant observations, discussions, walks-in-the-woods, semi-structured interviews and informal meetings were carried out in 12 villages of far western Nepal between 2011 and 2015 to assess how sociocultural changes have affected the sustenance of indigenous systems and local biodiversity, when compared to studies carried out in the previous decades...
2016: PloS One
https://www.readbyqxmd.com/read/27936184/freshwater-detention-by-oyster-reefs-quantifying-a-keystone-ecosystem-service
#6
David A Kaplan, Maitane Olabarrieta, Peter Frederick, Arnoldo Valle-Levinson
Oyster reefs provide myriad ecosystem services, including water quality improvement, fisheries and other faunal support, shoreline protection from erosion and storm surge, and economic productivity. However, their role in directing flow during non-storm conditions has been largely neglected. In regions where oyster reefs form near the mouth of estuarine rivers, they likely alter ocean-estuary exchange by acting as fresh water "dams". We hypothesize that these reefs have the potential to detain fresh water and influence salinity over extensive areas, thus providing a "keystone" ecosystem service by supporting estuarine functions that rely on the maintenance of estuarine (i...
2016: PloS One
https://www.readbyqxmd.com/read/27936137/patchiness-of-ciliate-communities-sampled-at-varying-spatial-scales-along-the-new-england-shelf
#7
Jean-David Grattepanche, George B McManus, Laura A Katz
Although protists (microbial eukaryotes) provide an important link between bacteria and Metazoa in food webs, we do not yet have a clear understanding of the spatial scales on which protist diversity varies. Here, we use a combination of DNA fingerprinting (denaturant gradient gel electrophoresis or DGGE) and high-throughput sequencing (HTS) to assess the ciliate community in the class Spirotrichea at varying scales of 1-3 km sampled in three locations separated by at least 25 km-offshore, midshelf and inshore-along the New England shelf...
2016: PloS One
https://www.readbyqxmd.com/read/27936136/improving-the-non-hydrostatic-numerical-dust-model-by-integrating-soil-moisture-and-greenness-vegetation-fraction-data-with-different-spatiotemporal-resolutions
#8
Manzhu Yu, Chaowei Yang
Dust storms are devastating natural disasters that cost billions of dollars and many human lives every year. Using the Non-Hydrostatic Mesoscale Dust Model (NMM-dust), this research studies how different spatiotemporal resolutions of two input parameters (soil moisture and greenness vegetation fraction) impact the sensitivity and accuracy of a dust model. Experiments are conducted by simulating dust concentration during July 1-7, 2014, for the target area covering part of Arizona and California (31, 37, -118, -112), with a resolution of ~ 3 km...
2016: PloS One
https://www.readbyqxmd.com/read/27936086/geographical-heterogeneity-of-multiple-sclerosis-prevalence-in-france
#9
Diane Pivot, Marc Debouverie, Michel Grzebyk, David Brassat, Michel Clanet, Pierre Clavelou, Christian Confavreux, Gilles Edan, Emmanuelle Leray, Thibault Moreau, Sandra Vukusic, Guy Hédelin, Francis Guillemin
INTRODUCTION: Geographical variation in the prevalence of multiple sclerosis (MS) is controversial. Heterogeneity is important to acknowledge to adapt the provision of care within the healthcare system. We aimed to investigate differences in prevalence of MS in departments in the French territory. METHODS: We estimated MS prevalence on October 31, 2004 in 21 administrative departments in France (22% of the metropolitan departments) by using multiple data sources: the main French health insurance systems, neurologist networks devoted to MS and the Technical Information Agency of Hospitalization...
2016: PloS One
https://www.readbyqxmd.com/read/27936056/spatial-temporal-analysis-of-environmental-data-of-north-beijing-district-using-hilbert-huang-transform
#10
Yu Xiang, Xuezhi Wang, Lihua He, Wenyong Wang, William Moran
Temperature, solar radiation and water are major important variables in ecosystem models which are measurable via wireless sensor networks (WSN). Effective data analysis is necessary to extract significant spatial and temporal information. In this work, information regarding the long term variation of seasonal field environment conditions is explored using Hilbert-Huang transform (HHT) based analysis on the wireless sensor network data collection. The data collection network, consisting of 36 wireless nodes, covers an area of 100 square kilometres in Yanqing, the northwest of Beijing CBD, in China and data collection involves environmental parameter observations taken over a period of three months in 2011...
2016: PloS One
https://www.readbyqxmd.com/read/27936013/%C3%AE-asarone-rescues-pb-induced-impairments-of-spatial-memory-and-synaptogenesis-in-rats
#11
Qian-Qian Yang, Wei-Zhen Xue, Rong-Xin Zou, Yi Xu, Yang Du, Shuang Wang, Lai Xu, Yuan-Zhi Chen, Hui-Li Wang, Xiang-Tao Chen
Chronic lead (Pb) exposure causes cognitive deficits. This study aimed to explore the neuroprotective effect and mechanism of β-asarone, an active component from Chinese Herbs Acorus tatarinowii Schott, to alleviate impairments of spatial memory and synaptogenesis in Pb-exposed rats. Both Sprague-Dawley developmental rat pups and adult rats were used in the study. Developmental rat pups were exposed to Pb throughout the lactation period and β-asarone (10, 40mg kg-1, respectively) was given intraperitoneally from postnatal day 14 to 21...
2016: PloS One
https://www.readbyqxmd.com/read/27935979/uncovering-urban-temporal-patterns-from-geo-tagged-photography
#12
Silvia Paldino, Dániel Kondor, Iva Bojic, Stanislav Sobolevsky, Marta C González, Carlo Ratti
We live in a world where digital trails of different forms of human activities compose big urban data, allowing us to detect many aspects of how people experience the city in which they live or come to visit. In this study we propose to enhance urban planning by taking into a consideration individual preferences using information from an unconventional big data source: dataset of geo-tagged photographs that people take in cities which we then use as a measure of urban attractiveness. We discover and compare a temporal behavior of residents and visitors in ten most photographed cities in the world...
2016: PloS One
https://www.readbyqxmd.com/read/27935968/localization-of-low-copy-number-plasmid-prc4-in-replicating-rod-and-non-replicating-cocci-cells-of-rhodococcus-erythropolis-pr4
#13
Divya Singhi, Aayushi Jain, Preeti Srivastava
Rhodococcus are gram-positive bacteria, which can exist in two different shapes rod and cocci. A number of studies have been done in the past on replication and stability of small plasmids in this bacterium; however, there are no reports on spatial localization and segregation of these plasmids. In the present study, a low copy number plasmid pDS3 containing pRC4 replicon was visualized in growing cells of Rhodococcus erythropolis PR4 (NBRC100887) using P1 parS-ParB-GFP system. Cells were initially cocci and then became rod shaped in exponential phase...
2016: PloS One
https://www.readbyqxmd.com/read/27935958/synchronization-and-random-triggering-of-lymphatic-vessel-contractions
#14
James W Baish, Christian Kunert, Timothy P Padera, Lance L Munn
The lymphatic system is responsible for transporting interstitial fluid back to the bloodstream, but unlike the cardiovascular system, lacks a centralized pump-the heart-to drive flow. Instead, each collecting lymphatic vessel can individually contract and dilate producing unidirectional flow enforced by intraluminal check valves. Due to the large number and spatial distribution of such pumps, high-level coordination would be unwieldy. This leads to the question of how each segment of lymphatic vessel responds to local signals that can contribute to the coordination of pumping on a network basis...
December 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27935954/normal-wound-healing-and-tumor-angiogenesis-as-a-game-of-competitive-inhibition
#15
Irina Kareva, Abdo Abou-Slaybi, Oliver Dodd, Olga Dashevsky, Giannoula Lakka Klement
Both normal wound healing and tumor angiogenesis are mitigated by the sequential, carefully orchestrated release of growth stimulators and inhibitors. These regulators are released from platelet clots formed at the sites of activated endothelium in a temporally and spatially controlled manner, and the order of their release depends on their affinity to glycosaminoglycans (GAG) such as heparan sulfate (HS) within the extracellular matrix, and platelet open canallicular system. The formation of vessel sprouts, triggered by angiogenesis regulating factors with lowest affinities for heparan sulfate (e...
2016: PloS One
https://www.readbyqxmd.com/read/27935944/novel-and-lost-forests-in-the-upper-midwestern-united-states-from-new-estimates-of-settlement-era-composition-stem-density-and-biomass
#16
Simon J Goring, David J Mladenoff, Charles V Cogbill, Sydne Record, Christopher J Paciorek, Stephen T Jackson, Michael C Dietze, Andria Dawson, Jaclyn Hatala Matthes, Jason S McLachlan, John W Williams
BACKGROUND: EuroAmerican land-use and its legacies have transformed forest structure and composition across the United States (US). More accurate reconstructions of historical states are critical to understanding the processes governing past, current, and future forest dynamics. Here we present new gridded (8x8km) reconstructions of pre-settlement (1800s) forest composition and structure from the upper Midwestern US (Minnesota, Wisconsin, and most of Michigan), using 19th Century Public Land Survey System (PLSS), with estimates of relative composition, above-ground biomass, stem density, and basal area for 28 tree types...
2016: PloS One
https://www.readbyqxmd.com/read/27935937/let-s-not-waste-time-using-temporal-information-in-clustered-activity-estimation-with-spatial-adjacency-restrictions-caesar-for-parcellating-fmri-data
#17
Ronald J Janssen, Pasi Jylänki, Marcel A J van Gerven
We have proposed a Bayesian approach for functional parcellation of whole-brain FMRI measurements which we call Clustered Activity Estimation with Spatial Adjacency Restrictions (CAESAR). We use distance-dependent Chinese restaurant processes (dd-CRPs) to define a flexible prior which partitions the voxel measurements into clusters whose number and shapes are unknown a priori. With dd-CRPs we can conveniently implement spatial constraints to ensure that our parcellations remain spatially contiguous and thereby physiologically meaningful...
2016: PloS One
https://www.readbyqxmd.com/read/27935803/spatiotemporal-mapping-of-cervical-cancer-incidence-highlights-need-for-targeted-prevention-in-songkhla-province-thailand
#18
Jun Zhao, Shama Virani, Hutcha Sriplung
BACKGROUND: The national cervical cancer screening program in Thailand has been successful in reducing overall burden from this disease. However, evaluation on spatial and temporal scales is needed to assess the efficacy of this program in smaller regions. Here, we geographically assess incidence in a province with a uniquely heterogeneous distribution of lifestyle factors associated with religiosity. METHODS: Cervical cancer cases were extracted from the provincial cancer registry from 1989 to 2013...
October 25, 2016: Health Policy and Planning
https://www.readbyqxmd.com/read/27935680/self-assembling-nanocomposite-tectons
#19
Jianyuan Zhang, Peter J Santos, Paul A Gabrys, Sangho Lee, Caroline Liu, Robert J Macfarlane
The physical characteristics of composite materials are dictated by both the chemical composition and spatial configuration of each constituent phase. A major challenge in nanoparticle-based composites is developing methods to precisely dictate particle positions at the nanometer length scale, as this would allow complete control over nanocomposite structure-property relationships. In this work, we present a new class of building blocks called nanocomposite tectons (NCTs), which consist of inorganic nanoparticles grafted with a dense layer of polymer chains that terminate in molecular recognition units capable of programmed supramolecular bonding...
December 9, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27935640/the-basis-function-approach-for-modeling-autocorrelation-in-ecological-data
#20
Trevor J Hefley, Kristin M Broms, Brian M Brost, Frances E Buderman, Shannon L Kay, Henry R Scharf, John R Tipton, Perry J Williams, Mevin B Hooten
Analyzing ecological data often requires modeling the autocorrelation created by spatial and temporal processes. Many seemingly disparate statistical methods used to account for autocorrelation can be expressed as regression models that include basis functions. Basis functions also enable ecologists to modify a wide range of existing ecological models in order to account for autocorrelation, which can improve inference and predictive accuracy.Furthermore, understanding the properties of basis functions is essential for evaluating the fit of spatial or time-series models, detecting a hidden form of collinearity, and analyzing large data sets...
December 9, 2016: Ecology
keyword
keyword
20575
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"