منابع مشابه
Pushing the Pace of Tree Species Migration
Plants and animals have responded to past climate changes by migrating with habitable environments, sometimes shifting the boundaries of their geographic ranges by tens of kilometers per year or more. Species migrating in response to present climate conditions, however, must contend with landscapes fragmented by anthropogenic disturbance. We consider this problem in the context of wind-disperse...
متن کاملPushing for Weighted Tree Automata
A weight normalization procedure, commonly called pushing, is introduced for weighted tree automata (wta) over commutative semifields. The normalization preserves the recognized weighted tree language even for nondeterministic wta, but it is most useful for bottom-up deterministic wta, where it can be used for minimization and equivalence testing. In both applications a careful selection of the...
متن کاملPushing Constraints into a Pattern-Tree
Frequent Itemset Mining, or just pattern mining, plays an important role in data mining, aiming for the discovery of frequent cooccurrences in data. However, existing techniques still suffer from two bottlenecks that difficult the analysis and actual application of their results: they usually return a large number of patterns, and these patterns usually do not reflect user expectations. The mos...
متن کاملThe introduction of tree and shrub species in the central district of Zanjan county town
Floristic study is one of the most efficient methods of gaining knowledge about biological capacities, as well as management and conservation of plant genetic resources in ecological systems. Zanjan county town is located in a mountainous region with an area of 6763 km2 and the average altitude of 1663 m.a.s.l. Its favorable vegetation diversity is the result of suitable ecological conditions, ...
متن کاملCell Migration: PKA and RhoA Set the Pace
A new study shows that protein kinase A (PKA) activity establishes a signaling loop that governs protrusion-retraction cycles in migrating cells. PKA activity near the leading edge of protrusions phosphorylates RhoA and inhibits its activity via increased association with RhoGDI.
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ژورنال
عنوان ژورنال: PLoS ONE
سال: 2014
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0105380