منابع مشابه
Are there bushes in a forest?
In this paper we consider Markov processes in which the state at time t is & : Zd + (0, 1,2}. We think of 0 = grass, 1 = bushes, and 2 = trees, and formulate the evolution as follows: (i) l’s and 2’s each die (i.e. become 0) at rate 1. (ii) l’s (resp. 2’s) give birth at rate A, (resp. A,). (iii) If the birth occurs at x the offspring is sent to a site chosen at random from {y: y -x E X}, K = th...
متن کاملBushes in the Tree of Life
November 2006 | Volume 4 | Issue 11 | e352 Genome analyses are delivering unprecedented amounts of data from an abundance of organisms, raising expectations that in the near future, resolving the tree of life (TOL) will simply be a matter of data collection. However, recent analyses of some key clades in life’s history have produced bushes and not resolved trees. The patterns observed in these ...
متن کاملRAG - I 1 and RAG - 2 , Adjacent Genes That Synergistically
The vast repertoire of immunoglobulins and T cell receptors is generated, in part, by V(D)J recombination, a series of genomic rearrangements that occur specifically in developing lymphocytes. The recombination activating gene, RAG-1, which is a gene expressed exclusively in maturing lymphoid cells, was previously isolated. RAG-1 inefficiently induced V(D)J recombinase activity when transfected...
متن کاملBushes of Vibrational Modes for Fermi-pasta-ulam Chains
Some exact solutions and multi-mode invariant submanifolds were found for the Fermi-Pasta-Ulam (FPU) β-model by Poggi and Ruffo in Phys. D 103 (1997) 251. In the present paper we demonstrate how results of such a type can be obtained for an arbitrary Nparticle chain with periodic boundary conditions with the aid of our group-theoretical approach [Phys. D 117 (1998) 43] based on the concept of b...
متن کاملLearning conditional probabilities in event bushes with temporal labels
The event bush is a recently developed formalism for knowledge representation optimized specifically for Earth science knowledge. It graphically represents logical and/or probabilistic dependencies between its nodes (events). Numerical data in geosciences often come in the form of time series: therefore, it is a very common situation to have tables with time-related numerical data for the varia...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1879
ISSN: 0028-0836,1476-4687
DOI: 10.1038/020602e0