منابع مشابه
Predators are rare even when they are small
A recent review of published studies revealed that predators generally have lower population densities than non-predators in a variety of communities. We report here similar results for a highly replicated study of macroinvertebrates that colonized very uniform detrital microcosms in an old field. This pattern persisted even though predators usually were smaller than non-predators, as determine...
متن کاملEven Small Birds are Unique: Population Protocols with Identifiers
Although much research has been devoted to designing and experimenting on ad hoc networks of tiny devices, very little has focussed on devising theoretical models to capture the inherent power and limitations of such networks. A notable exception is the population protocol model of Angluin et al. [2]. This model is simple and elegant but is sometimes considered too restrictive because of its an...
متن کاملshrinks even small worlds
We consider small world graphs as defined by Kleinberg (2000), i.e., graphs obtained from a ddimensional mesh by adding links chosen at random according to the d-harmonic distribution. In these graphs, greedy routing performs in O(log2 n) expected number of steps. We introduce indirect-greedy routing. We show that giving O(log2 n) bits of topological awareness per node enables indirect-greedy r...
متن کاملHamiltonian cycles with all small even chords
Let G be a graph of order n ≥ 3. An even squared hamiltonian cycle (ESHC) of G is a hamiltonian cycle C = v1v2 . . . vnv1 of G with chords vivi+3 for all 1 ≤ i ≤ n (where vn+j = vj for j ≥ 1). When n is even, an ESHC contains all bipartite 2-regular graphs of order n. We prove that there is a positive integer N such that for every graph G of even order n ≥ N , if the minimum degree δ(G) ≥ n 2 +...
متن کاملEven small SNP clusters are non-randomly distributed: is this evidence of mutational non-independence?
Single nucleotide polymorphisms (SNPs) are distributed highly non-randomly in the human genome through a variety of processes from ascertainment biases (i.e. the preferential development of SNPs around interesting genes) to the action of mutation hotspots and natural selection. However, with more systematic SNP development, one might expect an increasing proportion of SNPs to be distributed mor...
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ژورنال
عنوان ژورنال: Nature
سال: 1974
ISSN: 0028-0836,1476-4687
DOI: 10.1038/248099a0