104 research outputs found
Stress and Strain in Flat Piling of Disks
We have created a flat piling of disks in a numerical experiment using the
Distinct Element Method (DEM) by depositing them under gravity. In the
resulting pile, we then measured increments in stress and strain that were
associated with a small decrease in gravity. We first describe the stress in
terms of the strain using isotropic elasticity theory. Then, from a
micro-mechanical view point, we calculate the relation between the stress and
strain using the mean strain assumption. We compare the predicted values of
Young's modulus and Poisson's ratio with those that were measured in the
numerical experiment.Comment: 9 pages, 1 table, 8 figures, and 2 pages for captions of figure
Arches and contact forces in a granular pile
Assemblies of granular particles mechanically stable under their own weight
contain arches. These are structural units identified as sets of mutually
stable grains. It is generally assumed that these arches shield the weight
above them and should bear most of the stress in the system. We test such
hypothesis by studying the stress born by in-arch and out-of-arch grains. We
show that, indeed, particles in arches withstand larger stresses. In
particular, the isotropic stress tends to be larger for in-arch-grains whereas
the anisotropic component is marginally distinguishable between the two types
of particles. The contact force distributions demonstrate that an exponential
tail (compatible with the maximization of entropy under no extra constraints)
is followed only by the out-of-arch contacts. In-arch contacts seem to be
compatible with a Gaussian distribution consistent with a recently introduced
approach that takes into account constraints imposed by the local force balance
on grains.Comment: 7 pages, 7 figures, major revisio
Transgenerational Effects of Stress Exposure on Offspring Phenotypes in Apomictic Dandelion
Heritable epigenetic modulation of gene expression is a candidate mechanism to explain parental environmental effects on offspring phenotypes, but current evidence for environment-induced epigenetic changes that persist in offspring generations is scarce. In apomictic dandelions, exposure to various stresses was previously shown to heritably alter DNA methylation patterns. In this study we explore whether these induced changes are accompanied by heritable effects on offspring phenotypes. We observed effects of parental jasmonic acid treatment on offspring specific leaf area and on offspring interaction with a generalist herbivore; and of parental nutrient stress on offspring root-shoot biomass ratio, tissue P-content and leaf morphology. Some of the effects appeared to enhance offspring ability to cope with the same stresses that their parents experienced. Effects differed between apomictic genotypes and were not always consistently observed between different experiments, especially in the case of parental nutrient stress. While this context-dependency of the effects remains to be further clarified, the total set of results provides evidence for the existence of transgenerational effects in apomictic dandelions. Zebularine treatment affected the within-generation response to nutrient stress, pointing at a role of DNA methylation in phenotypic plasticity to nutrient environments. This study shows that stress exposure in apomictic dandelions can cause transgenerational phenotypic effects, in addition to previously demonstrated transgenerational DNA methylation effects
Density-Independent Mortality and Increasing Plant Diversity Are Associated with Differentiation of Taraxacum officinale into r- and K-Strategists
Background: Differential selection between clones of apomictic species may result in ecological differentiation without mutation and recombination, thus offering a simple system to study adaptation and life-history evolution in plants.
Methodology/Principal Findings: We caused density-independent mortality by weeding to colonizer populations of the largely apomictic Taraxacum officinale (Asteraceae) over a 5-year period in a grassland biodiversity experiment (Jena Experiment). We compared the offspring of colonizer populations with resident populations deliberately sown into similar communities. Plants raised from cuttings and seeds of colonizer and resident populations were grown under uniform conditions. Offspring from colonizer populations had higher reproductive output, which was in general agreement with predictions of r-selection theory. Offspring from resident populations had higher root and leaf biomass, fewer flower heads and higher individual seed mass as predicted under K-selection. Plants grown from cuttings and seeds differed to some degree in the strength, but not in the direction, of their response to the r- vs. K-selection regime. More diverse communities appeared to exert stronger K-selection on resident populations in plants grown from cuttings, while we did not find significant effects of increasing species richness on plants grown from seeds.
Conclusions/Significance: Differentiation into r- and K-strategists suggests that clones with characteristics of r-strategists were selected in regularly weeded plots through rapid colonization, while increasing plant diversity favoured the selection of clones with characteristics of K-strategists in resident populations. Our results show that different selection pressures may result in a rapid genetic differentiation within a largely apomictic species. Even under the assumption that colonizer and resident populations, respectively, happened to be r- vs. K-selected already at the start of the experiment, our results still indicate that the association of these strategies with the corresponding selection regimes was maintained during the 5-year experimental period
Long-distance seed dispersal by wind: disentangling the effects of species traits, vegetation types, vertical turbulence and wind speed
Coarse Grained Parallel Maximum Matching in Convex Bipartite Graphs
We present a coarse grained parallel algorithm for computing a maximum matching in a convex bipartite graph G = #A; B; E#.Forp processors with N=p memory per processor, N = jAj + jBj, N=p # p, the algorithm requires p ; log p# local computation, where n = jAj, m = jBj and T sequ #n; m# is the sequential time complexity for the problem. For the BSP model, this implies O#log p# supersteps log p# local computation
Improving properties of THz photoconductors by bonding to a high thermal conductivity substrate
Diversity of parental environments increases phenotypic variation in Arabidopsis populations more than genetic diversity but similarly affects productivity
[Background and Aims] The observed positive diversity effect on ecosystem functioning has rarely been assessed in terms of intraspecific trait variability within populations. Intraspecific phenotypic variability could stem
both from underlying genetic diversity and from plasticity in response to environmental cues. The latter might
derive from modifications to a plant’s epigenome and potentially last multiple generations in response to previous
environmental conditions. We experimentally disentangled the role of genetic diversity and diversity of parental
environments on population productivity, resistance against environmental fluctuations and intraspecific phenotypic variation.
[Methods} A glasshouse experiment was conducted in which different types of Arabidopsis thaliana populations were established: one population type with differing levels of genetic diversity and another type, genetically
identical, but with varying diversity levels of the parental environments (parents grown in the same or different environments). The latter population type was further combined, or not, with experimental demethylation to reduce
the potential epigenetic diversity produced by the diversity of parental environments. Furthermore, all populations
were each grown under different environmental conditions (control, fertilization and waterlogging). Mortality,
productivity and trait variability were measured in each population.
[Key Results] Parental environments triggered phenotypic modifications in the offspring, which translated into
more functionally diverse populations when offspring from parents grown under different conditions were brought
together in mixtures. In general, neither the increase in genetic diversity nor the increase in diversity of parental
environments had a remarkable effect on productivity or resistance to environmental fluctuations. However, when
the epigenetic variation was reduced via demethylation, mixtures were less productive than monocultures (i.e.
negative net diversity effect), caused by the reduction of phenotypic differences between different parental origins.
[Conclusions] A diversity of environmental parental origins within a population could ameliorate the negative
effect of competition between coexisting individuals by increasing intraspecific phenotypic variation. A diversity of parental environments could thus have comparable effects to genetic diversity. Disentangling the effect of
genetic diversity and that of parental environments appears to be an important step in understanding the effect of
intraspecific trait variability on coexistence and ecosystem functioning.This work was supported by the Czech Science Foundation (GACR
20-00871S) and the Estonian Research Council (project PSG293
to C.P.C.) and the European Union through the European Regional
Development Fund (Centre of Excellence EcolChange to C.P.C.).Peer reviewe
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