Nisus steps forth

Nisus steps forth.

Meanings that Roman authors gave to nisus (NYsus), a word chiefly used in poetry, ranged from the pedestrian (a step or tread) to the celestial (the course of the stars). Cicero, Horace, Vergil, and others used nisus to convey striving, endeavor, ascent, flight, and the pain of giving birth.1,2 In this issue of Neurology, a new feature, Nisus, steps forth, to link neurology and neurologists wit...

Intercellular Signaling: An Elusive Player Steps Forth

Cell-to-cell communication is a common theme in the regulation of cell fate and physiology in multicellular organisms. In plants, intercellular channels called plasmodesmata transport developmental transcription factors and mRNAs [1–5], though to date neither plasmodesmata specific proteins nor any components of the translocation machinery have been identified. Now, a biochemical approach has l...

FORTH Annotated Bibliography 5.31.11

Stack Caching in Forth

Stack caching speeds Forth up by keeping stack items in registers, reducing the number of memory accesses for stack items. This paper describes our work on extending Gforth’s stack caching implementation to support more than one register in the canonical state, and presents timing results for the resulting Forth system. For single-representation stack caches, keeping just one stack item in regi...

Back and forth bisimulations

This paper is concerned with bisimulation relations which do not only require related agents to simulate each others behavior in the direction of the arrows, but also to simulate each other when going back in history. First it is demonstrated that the back and forth variant of strong bisimulation leads to the same equivalence as the ordinary notion of strong bisimulation. Then it is shown that ...