Results 51 to 60 of about 564,985 (289)

Dispersive limits in the homogenization of the wave equation [PDF]

Annales de la Faculté des sciences de Toulouse : Mathématiques, 2003
The author studies a scalar wave equation (the Klein-Gordon equation) with a large potential in a periodic medium. The period is supposed of order \(\varepsilon\) and the potential is of order \(\varepsilon^{-2}\). The homogenized limit depends on the sign of the first cell eingenvalue \(\lambda_1\).
openaire   +2 more sources

Estimating and Mapping Ecological Processes Influencing Microbial Community Assembly

Frontiers in Microbiology, 2015
Ecological community assembly is governed by a combination of (i) selection resulting from among-taxa differences in performance; (ii) dispersal resulting from organismal movement; and (iii) ecological drift resulting from stochastic changes in ...
James C Stegen, Xueju eLin, Jim K Fredrickson, Allan eKonopka   +3 more
doaj   +1 more source

Seed dispersal and spatial pattern in tropical trees. [PDF]

PLoS Biology, 2006
Theories of tropical tree diversity emphasize dispersal limitation as a potential mechanism for separating species in space and reducing competitive exclusion.
Tristram G Seidler, Joshua B Plotkin
doaj   +1 more source

Changes in seed dispersal processes and the potential for between-patch connectivity for an arid land daisy [PDF]

, 2012
Dispersal is a major and critical process in population biology that has been particularly challenging to study. Animals can have major roles in seed dispersal even in species that do not appear specifically adapted to animal-aided dispersal.
Possingham, H., Chesson, P., Facelli, Jose M., Facelli, Jose M, Day, Jemery R, Day, Jeremy R., Emmerson, Louise, Possingham, Hugh P, Chesson, Peter, Emmerson, L., Facelli, J., Possingham, Hugh, Emmerson, Louise M., Day, J.   +13 more
core   +1 more source

Extracellular Proteins Limit the Dispersal of Biogenic Nanoparticles [PDF]

Science, 2007
High–spatial-resolution secondary ion microprobe spectrometry, synchrotron radiation–based Fourier-transform infrared spectroscopy, and polyacrylamide gel analysis demonstrated the intimate association of proteins with spheroidal aggregates of biogenic zinc sulfide nanocrystals, an example of extracellular biomineralization.
Moreau, John W., Weber, Peter K., Martin, Michael C., Gilbert, Benjamin, Hutcheon, Ian D., Banfield, Jillian F.   +5 more
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Design and analysis strategies for robust microbiome ageing research

FEBS Letters, EarlyView.
The gut microbiome changes with age and associates with age‐related morbidity and mortality, establishing it as a potential biomarker and intervention target for ageing. Realising this potential requires methodological rigour, yet distinguishing biological signals from methodological artefacts remains challenging across cohorts. This review provides an
Mark Olenik, İsmail Güderer, Yi Wang, Tayyaba Alvi, Prasoon Pandey, Handan Melike Dönertaş   +5 more
wiley   +1 more source

Strong spatial influence on colonization rates in a pioneer zooplankton metacommunity. [PDF]

PLoS ONE, 2012
The magnitude of community-wide dispersal is central to metacommunity models, yet dispersal is notoriously difficult to quantify in passive and cryptic dispersers such as many freshwater invertebrates.
Dagmar Frisch, Karl Cottenie, Anna Badosa, Andy J Green   +3 more
doaj   +1 more source

Acoustic Propagation in Dispersions in the Long Wavelength Limit [PDF]

SIAM Journal on Applied Mathematics, 2005
The problem of scattering of ultrasound by particles in the long wavelength limit has a well-established solution in terms of Rayleigh expansions of the scattered fields. However, this solution is ill-conditioned numerically, and recent work has attempted to identify an alternative method.
Valerie J. Pinfield, Oliver G. Harlen, M. J. W. Povey, Brian D. Sleeman   +3 more
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Peripheral lysosomes recruit PLEKHG3 to focal adhesions and restrain protrusion dynamics

FEBS Letters, EarlyView.
Proximity‐dependent labeling at the LAMTOR complex revealed the Rho GEF PLEKHG3 as a lysosome‐proximal protein directing the study toward the influence of lysosome positioning on actin dynamics and cell motility. We show that PLEKHG3 colocalizes with lysosomes at focal adhesion sites and observe that forced peripheral dispersion of lysosomes hinders ...
Rainer Ettelt, Ana‐Maria Sandru, Georg Vucak, Sebastian Didusch, Biljana Riemelmoser, Karin Ehrenreiter, Markus Hartl, Lukas A. Huber, Manuela Baccarini   +8 more
wiley   +1 more source

Fundamental limitations of dispersion mitigation filters

Optics Express, 2020
We investigate the fundamental limitations of dispersion mitigation filters. By analyzing the dispersion compensating process from basic principles, we demonstrate how a digital filter can mitigate arbitrarily weak dispersion without oversampling. We calculate the maximum distance the signal can pass with and without dispersion compensation, beyond ...
openaire   +2 more sources