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Combined effects of soil 3D spatial heterogeneity and biotic spatial heterogeneity (plant clumping) on ecosystem processes in grasslands Universiteit Antwerpen

Olga Vinduskova, Gaby Deckmyn, Michiel Bortier, Hans De Boeck, Yongjie Liu, Ivan Nijs
Soil heterogeneity has been shown to enhance plant diversity, but its effect on grassland productivity is less clear. Even less is known about the effect of plant clumping (intraspecific aggregation) and its potential interaction with soil heterogeneity. The combined effects of soil 3D spatial heterogeneity and species clumping were experimentally studied in grassland mesocosms consisting of four grassland species. These species were planted in ...

Mechano-electric heterogeneity of the myocardium as a paradigm of its function Universiteit Gent

Olga Solovyova, Leonid B Katsnelson, Peter Kohl, Alexander Panfilov, Andrey K Tsaturyan, Pavel B Tsyvian
Myocardial heterogeneity is well appreciated and widely documented, from sub-cellular to organ levels. This paper reviews significant achievements of the group, led by Professor Vladimir S. Markhasin, Russia, who was one of the pioneers in studying and interpreting the relevance of cardiac functional heterogeneity.

Firm heterogeneity in international trade Universiteit Gent

Ruben Dewitte
International trade affects us all. It expands markets for firms to thrive and increases varieties to satisfy consumers. From waking up with a coffee grown on Brazilian trees to closing a light manufactured in China at night, our daily routines are riddled with products that can be provided by firms located across the world. Not every firm chooses to do so though. Firms are different, heterogeneous, and only those that are sufficiently ...

The influence of resolution on the predictive power of spatial heterogeneity measures as biomarkers of liver fibrosis Universiteit Hasselt KU Leuven

Jari CLAES, Annelies AGTEN, Helena GEYS, Thomas NEYENS, Christel FAES
Spatial heterogeneity of cells in liver biopsies can be used as biomarker for disease severity of patients. This heterogeneity can be quantified by non -parametric statistics of point pattern data, which make use of an aggregation of the point locations. The method and scale of aggregation are usually chosen ad hoc, despite values of the aforementioned statistics being heavily dependent on them. Moreover, in the context of measuring ...

Effect of methacholine on peripheral lung mechanics and ventilation heterogeneity in asthma Vrije Universiteit Brussel

Sue Downie, Cm Salome, Sylvia Verbanck, B.r. Thompson, Norbert Berend, G.g. King
Downie SR, Salome CM, Verbanck S, Thompson BR, Berend N, King GG. Effect of methacholine on peripheral lung mechanics and ventilation heterogeneity in asthma. J Appl Physiol 114: 770-777, 2013. First published January 31, 2013; doi: 10.1152/japplphysiol.01198.2012.-The forced oscillation technique (FOT) and multiple-breath nitrogen washout (MBNW) are noninvasive tests that are potentially sensitive to peripheral airways, with MBNW indexes being ...

In asthma positive phase III slopes can result from structural heterogeneity of the bronchial tree Vrije Universiteit Brussel

Sylvia Verbanck, Brody Harry Foy

We have previously identified bronchial generations 5-7 as the locus of maximum contribution to the convective portion of the phase III slope in computed tomography (CT)-based lung models of patients with asthma. In the present study, we examined how phase III slope is generated locally, by specifically interrogating at individual branch points, the necessary condition for a phase III slope to occur: some degree of convective flow sequencing ...

Heterogeneity of absorbed dose distribution in kidney tissues and dose-response modelling of nephrotoxicity in radiopharmaceutical therapy with beta-particle emitters Vrije Universiteit Brussel

Clarita Saldarriaga Vargas, Michelle Andersson, Céline Bouvier-Capely, Wei Bo Li, Balázs Madas, Peter Covens, Lara Struelens, Lidia Strigari

Absorbed dose heterogeneity in kidney tissues is an important issue in radiopharmaceutical therapy. The effect of absorbed dose heterogeneity in nephrotoxicity is, however, not fully understood yet, which hampers the implementation of treatment optimization by obscuring the interpretation of clinical response data and the selection of optimal treatment options. Although some dosimetry methods have been developed for kidney dosimetry to the ...

Gravity, globalization and time-varying heterogeneity Universiteit Gent

Scott Baier, Samuel Standaert
As data availability improves, the gravity model of international trade is used to study the flow of trade over increasingly long periods of time. This puts pressure on the standard assumption that constant bilateral fixed effects are sufficient to control for unobserved heterogeneity. When looking across decades rather than years, changes in the economic landscape will affect both explanatory and dependent variables, thus biasing the results. ...

Heterogeneity of aerobic fitness changes with exercise training in progressive multiple sclerosis: Secondary, exploratory analysis of data from the CogEx trial Universiteit Hasselt

Peter FEYS
Background: There is heterogeneity of aerobic fitness (VO2peak) changes with a standardized exercise training stimulus in the general population (i.e. some participants demonstrate improvements, others no change, and some a reduction in VO2peak). Objectives: This secondary, exploratory analysis of data examined the heterogeneity of VO2peak responses and possible correlates among persons with progressive multiple sclerosis (PMS) from the CogEx ...