نتایج جستجو برای: spatial gradients
تعداد نتایج: 394873 فیلتر نتایج به سال:
The spatial distribution of soil organisms is influenced by the plant cover, thus resulting in a horizontal mosaic of areas subjected to gradients of nutrient availability and microclimatic conditions.This study was conducted to investigate the spatial variability of soil macrofauna in relation to vegetation density in the riparian forest landscape of Karkhe. The vegetation density was determin...
Despite long-standing interest in elevational-diversity gradients, little is known about the processes that cause changes in the compositional variation of communities (β-diversity) across elevations. Recent studies have suggested that β-diversity gradients are driven by variation in species pools, rather than by variation in the strength of local community assembly mechanisms such as dispersal...
The mechanism by which neutrophil leucocytes exhibit chemotaxis continues to be the subject of debate. In recent articles in this journal (Vicker et al. 1986; Ilaston & Wilkinson, 1987) the question of whether neutrophils can perceive spatial attractant concentration gradients has been discussed. The purpose of this brief note is to give attention to some information that should help clarify so...
Elevational gradients hold enormous potential for understanding general properties of biodiversity. Like latitudinal gradients, the hypotheses for diversity patterns can be grouped into historical explanations, climatic drivers, and spatial hypotheses. The spatial hypotheses include the species-area effect and spatial constraint (mid-domain effect null models). I test these two spatial hypothes...
The spatiotemporal kinetics of proteins and other substrates regulate cell fate and signaling. In this study, we consider a reaction-diffusion model of interaction of membrane receptors with a two-step kinase cascade. The receptors activate the 'up-stream' kinase, which may diffuse over cell volume and activate the 'down-stream' kinase, which is also diffusing. Both kinase species and receptors...
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