Zipping Up and Down

Tubulogenesis: Zipping up Your Fly

In animals, rearrangements of the junctions between cells are fundamental to morphogenesis. Recent work has revealed the acrobatics that Drosophila tracheal cells perform as they intercalate to form unicellular tubes.

Language trees and zipping.

In this Letter we present a very general method for extracting information from a generic string of characters, e.g., a text, a DNA sequence, or a time series. Based on data-compression techniques, its key point is the computation of a suitable measure of the remoteness of two bodies of knowledge. We present the implementation of the method to linguistic motivated problems, featuring highly acc...

Judging up and down.

In Experiment I subjects were asked to judge whether an arrow was pointing up or pointing down at various heights inside a surrounding rectangle. They were faster on an arrow pointing up the higher it was in the rectangle, and they were faster on an arrow pointing down the lower it was in the rectangle. Experiments 2, 3, and 4 were designed to test sources for this"congruity effect." The intrus...

Up-and-down designs

Partial Up and Down

This paper presents logics for reasoning about extension and reduction of partial information states. This enterprise amounts to non-persistent variations of certain constructive logics, in particular the so-called logic of constructible falsity of Nelson 1949]. We provide simple semantics, sequential calculi, completeness and decidability proofs. The most simple logical means for knowledge rep...