منابع مشابه
Axis Formation: Redundancy Rules
The role of BMP antagonists in the Spemann-Mangold organizer of vertebrate embryos is a controversial issue. A study using combined knock down of multiple antagonists finally reveals dramatic effects.
متن کاملSome formal properties of phonological redundancy rules
Redundancy in this theory means that the specification (either + or -) of certain features of a phoneme is predictable given the specifications of certain other features of the same phoneme and/or of neighbouring phonemes of a phoneme sequence. These restrictions on feature specifications are usually expressed by "redundancy rules". E.g. in English all nasal phonemes voiced which is expressed b...
متن کاملOn redundancy elimination tolerant scheduling rules
In (Ferrucci, Pacini and Sessa, 1995) an extended form of resolution, called Reduced SLD resolution (RSLD), is introduced. In essence, an RSLD derivation is an SLD derivation such that redundancy elimination from resolvents is performed after each rewriting step. It is intuitive that redundancy elimination may have positive effects on derivation process. However, undesiderable effects are also ...
متن کاملAxis formation in zebrafish.
Recent advances in our understanding of axis formation and patterning in zebrafish relate the developmental mode of this aspiring genetic model organism to higher vertebrates. The effect of UV irradiation and lithium treatment, as well as detailed early lineage analyses, have shed some light on dorsoventral axis formation. However, the molecular mechanism of axis formation, as well as the ident...
متن کاملSchedulers and redundancy for a class of constraint propagation rules
We study here schedulers for a class of rules that naturally arise in the context of rule-based constraint programming. We systematically derive a scheduler for them from a generic iteration algorithm of (Apt 2000). We apply this study to so-called membership rules of (Apt and Monfroy 2001). This leads to an implementation that yields a considerably better performance for these rules than their...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2005
ISSN: 0960-9822
DOI: 10.1016/j.cub.2005.05.002