Results 261 to 270 of about 319,235 (305)

Phenotypically heterogeneous populations in spatially heterogeneous environments

Physical Review E, 2014
The spatial expansion of a population in a nonuniform environment may benefit from phenotypic heterogeneity with interconverting subpopulations using different survival strategies. We analyze the crossing of an antibiotic-containing environment by a bacterial population consisting of rapidly growing normal cells and slow-growing, but antibiotic ...
Patra, P., Klumpp, S.
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Heterogeneous Spatial Reasoning

2005
In this article, we investigate the problem of checking consistency in a hybrid formalism, which combines two essential formalisms in qualitative spatial reasoning: topological formalism and cardinal direction formalism. Instead of using conventional composition tables, we investigate the interactions between topological and cardinal directional ...
Haibin Sun, Wenhui Li 0002
openaire   +1 more source

Quantifying Spatial Heterogeneity in Streams

Journal of the North American Benthological Society, 1997
Although theoretical and empirical studies show that spatial heterogeneity has important effects on the dynamics of populations and the structure of communities, there has been little rigorous quantification of terms like ''patchiness'' or ''spatial ...
Scott D Cooper, Leon A Barmuta, Orlando Sarnelle   +2 more
exaly   +2 more sources

Spatial Heterogeneity in Epidemic Models

Journal of Theoretical Biology, 1996
Spatial heterogeneity is believed to play an important role in the persistence and dynamics of epidemics of childhood diseases because asynchrony between populations within different regions allows global persistence, even if the disease dies out locally. A simple multi-patch (metapopulation) model for spatial heterogeneity in epidemics is analysed and
A L, Lloyd, R M, May
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Spatial heterogeneity in the mammalian liver

Nature Reviews Gastroenterology & Hepatology, 2019
Hepatocytes operate in highly structured repeating anatomical units termed liver lobules. Blood flow along the lobule radial axis creates gradients of oxygen, nutrients and hormones, which, together with morphogenetic fields, give rise to a highly variable microenvironment.
Shani Ben-Moshe, Shalev Itzkovitz
openaire   +2 more sources

Spatial Heterogeneity in Crime Analysis

CrimRxiv, 2012
Issues related to the modifiable areal unit problem are well-understood within geography. Though these issues are acknowledged in the spatial crime analysis literature, there is little research that assesses their impact. In fact, much of the cited spatial crime analysis literature that investigates the impact of modified areal units suggests that ...
Martin A. Andresen, Nick Malleson
openaire   +1 more source

Temporal heterogeneity increases with spatial heterogeneity in ecological communities

Ecology, 2018
AbstractHeterogeneity is increasingly recognized as a foundational characteristic of ecological systems. Under global change, understanding temporal community heterogeneity is necessary for predicting the stability of ecosystem functions and services.
Scott L. Collins, Meghan L. Avolio, Corinna Gries, Lauren M. Hallett, Sally E. Koerner, Kimberly J. La Pierre, Andrew L. Rypel, Eric R. Sokol, Samuel B. Fey, Dan F. B. Flynn, Sydney K. Jones, Laura M. Ladwig, Julie Ripplinger, Matt B. Jones   +13 more
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Spatial heterogeneity and the persistence of populations

Oecologia, 1974
The hypothesis that dispersal in a heterogeneous environment can be an important factor in population stability is examined. It is shown that dispersal may increase the persistence time of a population by several orders of magnitude.
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Spatial sorting with heterogeneous firms and heterogeneous sectors

Regional Science and Urban Economics, 2014
The present paper focuses on spatial sorting as a mechanism behind the well-established fact that there is a central region productivity premium. Using a model of heterogeneous firms that can move between regions, Baldwin and Okubo (2006) show how more productive firms sort themselves to the large core region.
Rikard Forslid, Toshihiro Okubo
openaire   +1 more source

Spatial heterogeneity of energy turnover in the heart

Pflügers Archiv, 2001
Local myocardial blood flow varies substantially in spite of a rather homogeneous morphology. To further elucidate this paradox, the spatial heterogeneity of tricarboxylic acid cycle turnover (J(TCA), micromol min(-1) g(-1)) and coronary flow was assessed at a high spatial resolution (6x6x6 mm3) in the open chest dog.
Decking, U. K., Skwirba, S., Zimmermann, M. F., Preckel, B., Thämer, V., Deussen, A., Schrader, J.   +6 more
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