Topographical Varia: V

Pontificiae Academiae Scientiarvm Scripta Varia

Topographical amnesia.

The ability to learn to criterion a visually-guided stylus maze was found impaired in patients with right posterior cerebral damage, not only in comparison with controls but also with other hemisphere-damaged groups. The contribution of the corresponding left sided area to this task is dubious, and certainly not substantial. This finding points to the independent organisation of long-term spati...

LeviTABLE: Electromagnetic Topographical Display

This paper describes the design of LeviTABLE, an electromagnetic controlled topographical display device. The electromagnets control the movement and displacement of an array of vertical rods. The height of these rods represents individual points of elevation in a landscape. We describe the iterative design and implementation of LeviTABLE, discuss design issues and suggest further research dire...

Topographical control of cells.

We review the literature on the reaction of cells to their surrounding topography. The topography may be that of surrounding cells, intercellular materials or biomaterials. The reactions include cell orientation, rates of movement, and activations of the cells. We concentrate on those papers where quantitative measurements of the reactions have been made and largely ignore those on subjective i...

Sesquiterpene lactone glycosides from the roots of Ferula varia.

Seven new sesquiterpene lactone glycosides (1-7) were isolated from the H2O-soluble fraction from the MeOH extract of the roots of Ferula varia. Their structures were elucidated by extensive spectroscopic analyses. The absolute configurations of compounds 1 and 2 were determined by modified Mosher's method.