keyword
MENU ▼
Read by QxMD icon Read
search

"spatial patterning"

keyword
https://www.readbyqxmd.com/read/29331897/a-framework-for-delineating-the-regional-boundaries-of-pm2-5-pollution-a-case-study-of-china
#1
Jianzheng Liu, Weifeng Li, Jiansheng Wu
Fine particulate matter (PM2.5) pollution has been a major issue in many countries. Considerable studies have demonstrated that PM2.5 pollution is a regional issue, but little research has been done to investigate the regional extent of PM2.5 pollution or to define areas in which PM2.5 pollutants interact. To allow for a better understanding of the regional nature and spatial patterns of PM2.5 pollution, This study proposes a novel framework for delineating regional boundaries of PM2.5 pollution. The framework consists of four steps, including cross-correlation analysis, time-series clustering, generation of Voronoi polygons, and polygon smoothing using polynomial approximation with exponential kernel method...
January 11, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29329101/spatial-variation-of-endotoxin-concentrations-measured-in-ambient-pm10-in-a-livestock-dense-area-implementation-of-a-land-use-regression-approach
#2
Myrna M T de Rooij, Dick J J Heederik, Erik J H M van Nunen, Isabella J van Schothorst, Catharina B M Maassen, Gerard Hoek, Inge M Wouters
BACKGROUND: Results from studies on residential health effects of livestock farming are inconsistent, potentially due to simple exposure proxies used (e.g., livestock density). Accuracy of these proxies compared with measured exposure concentrations is unknown. OBJECTIVES: We aimed to assess spatial variation of endotoxin in PM10 (particulate matter ≤10μm) at residential level in a livestock-dense area, compare simple livestock exposure proxies to measured endotoxin concentrations, and evaluate whether land-use regression (LUR) can be used to explain spatial variation of endotoxin...
January 11, 2018: Environmental Health Perspectives
https://www.readbyqxmd.com/read/29324265/bayesian-spatiotemporal-crash-frequency-models-with-mixture-components-for-space-time-interactions
#3
Wen Cheng, Gurdiljot Singh Gill, Yongping Zhang, Zhong Cao
The traffic safety research has developed spatiotemporal models to explore the variations in the spatial pattern of crash risk over time. Many studies observed notable benefits associated with the inclusion of spatial and temporal correlation and their interactions. However, the safety literature lacks sufficient research for the comparison of different temporal treatments and their interaction with spatial component. This study developed four spatiotemporal models with varying complexity due to the different temporal treatments such as (I) linear time trend; (II) quadratic time trend; (III) Autoregressive-1 (AR-1); and (IV) time adjacency...
January 8, 2018: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/29323781/soil-phosphorus-does-not-keep-pace-with-soil-carbon-and-nitrogen-accumulation-following-woody-encroachment
#4
Yong Zhou, Thomas W Boutton, X Ben Wu
Soil carbon, nitrogen, and phosphorus cycles are strongly interlinked and controlled through biological processes, and the phosphorus cycle is further controlled through geochemical processes. In dryland ecosystems, woody encroachment often modifies soil carbon, nitrogen, and phosphorus stores, although it remains unknown if these three elements change proportionally in response to this vegetation change. We evaluated proportional changes and spatial patterns of soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) concentrations following woody encroachment by taking spatially-explicit soil cores to a depth of 1...
January 11, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29322582/large-scale-disturbance-legacies-and-the-climate-sensitivity-of-primary-picea-abies-forests
#5
Jonathan S Schurman, Volodymyr Trotsiuk, Radek Bače, Vojtěch Čada, Shawn Fraver, Pavel Janda, Dominik Kulakowski, Jana Labusova, Martin Mikoláš, Thomas A Nagel, Rupert Seidl, Michal Synek, Kristýna Svobodová, Oleh Chaskovskyy, Marius Teodosiu, Miroslav Svoboda
Determining the drivers of shifting forest disturbance rates remains a pressing global change issue. Large-scale forest dynamics are commonly assumed to be climate driven, but appropriately scaled disturbance histories are rarely available to assess how disturbance legacies alter subsequent disturbance rates and the climate sensitivity of disturbance. We compiled multiple tree-ring based disturbance histories from primary Picea abies forest fragments distributed throughout five European landscapes spanning the Bohemian Forest and the Carpathian Mountains...
January 11, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29321528/large-scale-ocean-connectivity-and-planktonic-body-size
#6
Ernesto Villarino, James R Watson, Bror Jönsson, Josep M Gasol, Guillem Salazar, Silvia G Acinas, Marta Estrada, Ramón Massana, Ramiro Logares, Caterina R Giner, Massimo C Pernice, M Pilar Olivar, Leire Citores, Jon Corell, Naiara Rodríguez-Ezpeleta, José Luis Acuña, Axayacatl Molina-Ramírez, J Ignacio González-Gordillo, Andrés Cózar, Elisa Martí, José A Cuesta, Susana Agustí, Eugenio Fraile-Nuez, Carlos M Duarte, Xabier Irigoien, Guillem Chust
Global patterns of planktonic diversity are mainly determined by the dispersal of propagules with ocean currents. However, the role that abundance and body size play in determining spatial patterns of diversity remains unclear. Here we analyse spatial community structure - β-diversity - for several planktonic and nektonic organisms from prokaryotes to small mesopelagic fishes collected during the Malaspina 2010 Expedition. β-diversity was compared to surface ocean transit times derived from a global circulation model, revealing a significant negative relationship that is stronger than environmental differences...
January 10, 2018: Nature Communications
https://www.readbyqxmd.com/read/29320520/not-seeing-the-grass-for-the-trees-timber-plantations-and-agriculture-shrink-tropical-montane-grassland-by-two-thirds-over-four-decades-in-the-palani-hills-a-western-ghats-sky-island
#7
M Arasumani, Danish Khan, Arundhati Das, Ian Lockwood, Robert Stewart, Ravi A Kiran, M Muthukumar, Milind Bunyan, V V Robin
Tropical montane habitats, grasslands, in particular, merit urgent conservation attention owing to the disproportionate levels of endemic biodiversity they harbour, the ecosystem services they provide, and the fact that they are among the most threatened habitats globally. The Shola Sky Islands in the Western Ghats host a matrix of native forest-grassland matrix that has been planted over the last century, with exotic timber plantations. The popular discourse on the landscape change is that mainly forests have been lost to the timber plantations and recent court directives are to restore Shola forest trees...
2018: PloS One
https://www.readbyqxmd.com/read/29320159/bioinspired-nanostructured-surfaces-for-on-demand-bubble-transportation
#8
Xin Tang, Hairui Xiong, Tiantian Kong, Ye Tian, Wen-Di Li, Liqiu Wang
The maneuver of small bubbles in a programmed way will advance numerous processes, including gas evolution reaction and aeration. Unlike in-air droplets, rapidly rising bubbles in liquid medium can hardly be steered through interaction with solid substrates, causing difficulties in maneuvering bubbles. We pattern and lubricate nanoporous substrates with regions of contrasting wettability that is similar to the back of Namib desert beetles and subsequently immerse the lubricated surface underwater to spontaneously form spatially patterned Nepenthes-inspired slippery surfaces after the dewetting of lubricants...
January 10, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29317656/conservation-of-pattern-as-a-tool-for-inference-on-spatial-snapshots-in-ecological-data
#9
Michael A Irvine, James C Bull, Matt J Keeling
As climate change and other anthropogenic factors increase the uncertainty of vegetation ecosystem persistence, the ability to rapidly assess their dynamics is paramount. Vegetation and sessile communities form a variety of striking regular spatial patterns such as stripes, spots and labyrinths, that have been used as indicators of ecosystem current state, through qualitative analysis of simple models. Here we describe a new method for rigorous quantitative estimation of biological parameters from a single spatial snapshot...
January 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29317370/3d-printed-gelatin-scaffolds-of-differing-pore-geometry-modulate-hepatocyte-function-and-gene-expression
#10
Phillip L Lewis, Richard M Green, Ramille N Shah
Three dimensional (3D) printing is highly amenable to the fabrication of tissue-engineered organs of a repetitive microstructure such as the liver. The creation of uniform and geometrically repetitive tissue scaffolds can also allow for the control over cellular aggregation and nutrient diffusion. However, the effect of differing geometries, while controlling for pore size, has yet to be investigated in the context of hepatocyte function. In this study, we show the ability to precisely control pore geometry of 3D-printed gelatin scaffolds...
January 6, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29316535/the-hippo-pathway-in-organ-development-homeostasis-and-regeneration
#11
REVIEW
Vivian Fu, Steven W Plouffe, Kun-Liang Guan
The Hippo pathway is a universal governor of organ size, tissue homeostasis, and regeneration. A growing body of work has advanced our understanding of Hippo pathway regulation of cell proliferation, differentiation, and spatial patterning not only in organ development but also upon injury-induced regeneration. The pathway's central role in stem cell biology thus implicates its potential for therapeutic manipulation in mammalian organ regeneration. In this review, we survey recent literature linking the Hippo pathway to the development, homeostasis, and regeneration of various organs, including Hippo-independent roles for YAP, defined here as YAP functions that are not regulated by the Hippo pathway kinases LATS1/2...
January 6, 2018: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/29315515/observed-trends-of-soil-fauna-in-the-antarctic-dry-valleys-early-signs-of-shifts-predicted-under-climate-change
#12
W S Andriuzzi, B J Adams, J E Barrett, R A Virginia, D H Wall
Long-term observations of ecological communities are necessary for generating and testing predictions of ecosystem responses to climate change. We investigated temporal trends and spatial patterns of soil fauna along similar environmental gradients in three sites of the McMurdo Dry Valleys, Antarctica, spanning two distinct climatic phases: a decadal cooling trend from the early 1990s through the austral summer of February 2001, followed by a shift to the current trend of warming summers and more frequent discrete warming events...
January 5, 2018: Ecology
https://www.readbyqxmd.com/read/29315513/climate-sensitivity-functions-and-net-primary-production-a-framework-for-incorporating-climate-mean-and-variability
#13
Jennifer A Rudgers, Y Anny Chung, Gregory E Maurer, Douglas I Moore, Esteban H Muldavin, Marcy E Litvak, Scott L Collins
Understanding controls on net primary production (NPP) has been a long-standing goal in ecology. Climate is a well-known control on NPP, although the temporal differences among years within a site are often weaker than the spatial pattern of differences across sites. Climate sensitivity functions describe the relationship between an ecological response (e.g., NPP) and both the mean and variance of its climate driver (e.g., aridity index), providing a novel framework for understanding how climate trends in both mean and variance vary with NPP over time...
January 9, 2018: Ecology
https://www.readbyqxmd.com/read/29315265/spatial-and-seasonal-dynamics-of-water-environmental-capacity-in-mountainous-rivers-of-the-southeastern-coast-china
#14
Qiankun Liu, Jingang Jiang, Changwei Jing, Jiaguo Qi
The south-east littoral is one of the most populous and developed regions in China suffering from serious water pollution problems, and the Xian-Jiang Basin in the mid of this region is among the most polluted watersheds. Critical information is needed but lacking for improved pollution control and water quality assessment, among which water environmental capacity (WEC) is the most important variable but is difficult to calculate. In this study, a one-dimensional water quality model combined with a matrix calculation algorithm was first developed and calibrated with in-situ observations in the Xian-Jiang basin...
January 9, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29311696/reliable-landmarks-for-precise-topographical-analyses-of-pathological-structural-changes-of-the-ovine-tibial-plateau-in-2-d-and-3-d-subspaces
#15
Tamás Oláh, Jan Reinhard, Liang Gao, Lars K H Goebel, Henning Madry
Selecting identical topographical locations to analyse pathological structural changes of the osteochondral unit in translational models remains difficult. The specific aim of the study was to provide objectively defined reference points on the ovine tibial plateau based on 2-D sections of micro-CT images useful for reproducible sample harvesting and as standardized landmarks for landmark-based 3-D image registration. We propose 5 reference points, 11 reference lines and 12 subregions that are detectable macroscopically and on 2-D micro-CT sections...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29306160/do-spatial-patterns-of-urbanization-and-land-consumption-reflect-different-socioeconomic-contexts-in-europe
#16
REVIEW
Luca Salvati, Ilaria Zambon, Francesco Maria Chelli, Pere Serra
Land-use changes and urban sprawl have transformed European cities, with a direct impact on both metropolitan structures and socioeconomic functions. However, these processes tend to be relatively different across countries, being influenced by place-specific factors associated to socioeconomic, historical, political and cultural factors that influence decisions on the use of land. Considering 155 metropolitan areas in 6 European macro-regions, the present study investigates spatial patterns of land consumption profiling cities according to a large set of territorial variables, with the final objective to identify relevant socioeconomic dimensions characteristic of recent processes of urban growth...
January 3, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29305629/microbial-communities-of-high-elevation-fumaroles-penitentes-and-dry-tephra-soils-of-the-puna-de-atacama-volcanic-zone
#17
Adam J Solon, Lara Vimercati, J L Darcy, Pablo Arán, Dorota Porazinska, C Dorador, M E Farías, S K Schmidt
The aim of this study was to understand the spatial distribution of microbial communities (18S and 16S rRNA genes) across one of the harshest terrestrial landscapes on Earth. We carried out Illumina sequencing using samples from two expeditions to the high slopes (up to 6050 m.a.s.l.) of Volcán Socompa and Llullaillaco to describe the microbial communities associated with the extremely dry tephra compared to areas that receive water from fumaroles and ice fields made up of nieves penitentes. There were strong spatial patterns relative to these landscape features with the most diverse (alpha diversity) communities being associated with fumaroles...
January 5, 2018: Microbial Ecology
https://www.readbyqxmd.com/read/29301203/wireless-semg-system-with-a-microneedle-based-high-density-electrode-array-on-a-flexible-substrate
#18
Minjae Kim, Gangyong Gu, Kyoung Je Cha, Dong Sung Kim, Wan Kyun Chung
Surface electromyography (sEMG) signals reflect muscle contraction and hence, can provide information regarding a user's movement intention. High-density sEMG systems have been proposed to measure muscle activity in small areas and to estimate complex motion using spatial patterns. However, conventional systems based on wet electrodes have several limitations. For example, the electrolyte enclosed in wet electrodes restricts spatial resolution, and these conventional bulky systems limit natural movements. In this paper, a microneedle-based high-density electrode array on a circuit integrated flexible substrate for sEMG is proposed...
December 30, 2017: Sensors
https://www.readbyqxmd.com/read/29300822/spatio-temporal-arrangement-of-chamaerops-humilis-inflorescences-and-occupancy-patterns-by-its-nursery-pollinator-derelomus-chamaeropsis
#19
M E Jácome-Flores, Miguel Delibes, Thorsten Wiegand, José M Fedriani
Background and Aims: Nursery pollination is a highly specialized interaction in which pollinators breed inside plant reproductive structures. Pollinator occupancy of host plants often depends on plant location, flowering synchrony and sex. The nursery pollination system between the dioecious dwarf palm Chamaerops humilis (Arecaceae) and the host-specific palm flower weevil Derelomus chamaeropsis was investigated. For the first time, sex, flowering synchrony and spatial distribution of plants was related to the occupancy probability and the abundance of D...
January 2, 2018: Annals of Botany
https://www.readbyqxmd.com/read/29297856/silicosis-mortality-in-italy-temporal-trends-1990-2012-and-spatial-patterns-2000-2012
#20
Giada Minelli, Amerigo Zona, Fulvio Cavariani, Pietro Comba, Roberto Pasetto
INTRODUCTION: The objective of this contribution is to describe, for the first time, occurrence, temporal trends and spatial patterns of mortality from silicosis in Italy in recent decades. METHODS: Mortality data on pneumoconiosis due to silica or silicates (ICD-9 code 502, ICD-10 code J62) were extracted from the Italian National Mortality Database. Temporal trends were analysed in the period 1990-2012; standardized rates per 100 000, spatial distribution, including cluster analysis, were computed for eleven years, i...
October 2017: Annali Dell'Istituto Superiore di Sanità
keyword
keyword
81082
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"