منابع مشابه
Branching out requires VEGF
ot all isoforms are created equal. New results from Christiana Ruhrberg, David Shima (Cancer Research UK, London, UK), and colleagues reveal that the stickiness of vascular endothelial growth factor (VEGF) can make all the difference between blood vessels growing larger or finding new territory. VEGF initiates the formation and expansion of the vascular system. VEGF isoforms differ in their abi...
متن کاملBranching out with inverse functions
The current treatments of inverse functions suffer from two deficiencies. The first is simply confusion of notation, with different standard reference works using different, and contradictory, conventions. The second deficiency is the way in which the multivalued nature of the functions is handled. A new approach is offered here which addresses both problems. A new notation is proposed that mak...
متن کاملMinimum Leaf Out-Branching Problems
Given a digraph D, the Minimum Leaf Out-Branching problem (MinLOB) is the problem of finding in D an out-branching with the minimum possible number of leaves, i.e., vertices of out-degree 0. We prove that MinLOB is polynomial-time solvable for acyclic digraphs. In general, MinLOB is NP-hard and we consider three parameterizations of MinLOB. We prove that two of them are NP-complete for every va...
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Environmental stress triggers substantial alterations in animal physiology and, in some cases, brain structure. Using the nematode Caenorhabditis elegans, a new study reports that unfavorable conditions lead to dramatic dendrite remodeling in neurons that mediate an adaptive dispersal behavior.
متن کاملBranching out: meiotic recombination and its regulation.
Homologous recombination is a dynamic process by which DNA sequences and strands are exchanged. In meiosis, the reciprocal DNA recombination events called crossovers are central to the generation of genetic diversity in gametes and are required for homolog segregation in most organisms. Recent studies have shed light on how meiotic crossovers and other recombination products form, how their pos...
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ژورنال
عنوان ژورنال: Nature Reviews Genetics
سال: 2003
ISSN: 1471-0056,1471-0064
DOI: 10.1038/nrg1099