There exists a homeomorphism between any compact orientable closed surface and the configuration space of an appropriate mechanical linkage defined by a weighted graph embedded in the Euclidean plane. 1. I n t r o d u c t i o n A m e c h a n i c a l l inkage G is a mechanism in the Euclidean plane R 2 that is built up exclusively from rigid bars joined along flexible links. Some links of the li...

The design of the ASP detector is described and details of the construction and performance of the lead-glass tracking calorimeter are presented. ASP, a non-magnetic particle detector, was used at the PEP e+estorage -.-. ring at ,/X = 29 GeV to study low-multiplicity final states consisting primarily of electrons and photons. The design utilized extruded lead-glass bars to obtain a compact elec...

1. We studied how neurons in the middle temporal visual area (MT) of anesthetized macaque monkeys responded to textured and nontextured visual stimuli. Stimuli contained a central rectangular "figure" that was either uniform in luminance or consisted of an array of oriented line segments. The figure moved at constant velocity in one of four orthogonal directions. The region surrounding the figu...

BACKGROUND New Zealand introduced a smokefree bars and restaurants policy in December 2004. We reviewed the data available at December 2005 on the main public health, societal and political impacts and responses within New Zealand to the new law. METHODS Data were collected from publicly available survey reports, and from government departments and interviews. This included data on smoking in...

In the article listed above, the bars in Fig. 4B were erroneously labeled. The white bars should have been labeled sedentary mice (SED), and the black bars should have been labeled mice exercised with voluntary wheel running (VWR). The online version has been updated to correct these errors.

Compensation due to density-dependent mechanisms is essential for the maintenance of an exploited fish stock. Understanding compensation is important for understanding population regulation and responses to added mortality. We examined possible density-dependent effects on striped bass (Morone saxatilis) in the San Francisco Estuary. Three sets of data from sampling programs for young striped b...

The vast majority of American middle schools and high schools sell what is known as "competitive foods", such as soft drinks, candy bars, and chips, to children. The relationship between consumption of sugar-sweetened drinks and snacks and childhood obesity is well established but it remains unknown whether competitive food sales in schools are related to unhealthy weight gain among children. W...