In the mouse, however, it has been demonstrated that the two most posterior of the five digits are derived entirely from the polarizing region by proliferation without the requirement of Shh diffusion. To understand the contribution and significance that polarizing region cell proliferation has in forming different digit patterns, we grafted polarizing regions from a transgenic chicken line sta...

A novel resonator is proposed, in which the polarizing properties of standard grating and polarizing components (such as Brewster angle windows) inside the cavity are used to vary continuously the ouput coupling over a wide range of values. An analysis of the polarization properties of the modes of such a resonator is presented, and practical suggestions are made about the choice of the polariz...

We report experimental results with a reflective continuous anisotropic polarizing diffraction-grating beam splitter that produces three diffraction orders. The diffraction efficiencies and polarizations of the diffracted orders are controlled through the incoming polarization state and by use of a wave plate with arbitrary orientation located between the grating and a mirror. In particular, we...

EPITHELIUM-FIBRE CELL COUPLING IN THE EYE LENS PRESCOTT, A.R., DAHM. R.. HUTCHESON, A.M., QUIN!-AN. R.A., VANMARLE. J.‘, & VRENSEN. G§. Department of Biochemistry, University of Dundee, Medical Sciences Institute, Dundee, DDl 4HN. Scotland. * Department of Electron Microscopy, Faculty of Medicine, University of Amsterdam, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands. 5 Department of Morp...

S plitting mitotic cells in two is not the one-way signaling road it once seemed, based on evidence from Hu et al. The group identifi es a positive feedback loop that creates a furrow at cytokinesis. The fi ndings also throw a wrench in the well-accepted dogma of microtubule dynamic instability. Hu and colleagues devised a monopolar HeLa system to determine how the cytokinetic furrow is created...

This paper presents a non-binary polar coding scheme that can reach the equidistant distant spectrum bound for discrete memoryless channels. This is the best that can be reached up to now and is tight for additive white Gaussian channels. To do this, we first define the equidistant property for the polarizing transforms. We have designed transforms that have better distance characteristics usin...

Double-negation translations are used to encode and decode classical proofs in intuitionistic logic. We show that, in the cut-free fragment, we can simplify the translations and introduce fewer negations. To achieve this, we consider the polarization of the formulæ and adapt those translation to the different connectives and quantifiers. We show that the embedding results still hold, using a cu...

Kinetochores take alter native transportation K inetochores heading for the spindle poles early in mitosis have two travel options, as Tanaka et al. show on page 269. They can slide on microtubules or get tugged along as the fi bers shrink. Before it can parcel out its chromosomes, a mitotic cell has to position them between the spindle poles. The process starts when microtubules from one pole ...