Long-Term Potentiation: One Kind or Many?

Do neurobiologists aim to discover natural kinds? I address this question in this chapter via a critical analysis of classification practices operative across the 43-year history of research on long-term potentiation (LTP). I argue that this 43-year history supports the idea that the structure of scientific practice surrounding LTP research has remained an obstacle to the discovery of natural kinds

Lawson criterion for ignition exceeded in an inertial fusion experiment

For more than half a century, researchers around the world have been engaged in attempts to achieve fusion ignition as a proof of principle of various fusion concepts. Following the Lawson criterion, an ignited plasma is one where the fusion heating power is high enough to overcome all the physical processes that cool the fusion plasma, creating a positive thermodynamic feedback loop with rapidly increasing temperature. In inertially confined fusion, ignition is a state where the fusion plasma can begin "burn propagation" into surrounding cold fuel, enabling the possibility of high energy gain. While "scientific breakeven" (i.e., unity target gain) has not yet been achieved (here target gain is 0.72, 1.37 MJ of fusion for 1.92 MJ of laser energy), this Letter reports the first controlled fusion experiment, using laser indirect drive, on the National Ignition Facility to produce capsule gain (here 5.8) and reach ignition by nine different formulations of the Lawson criterion

An Addendum to Harrington\u27s Northern Salinan Place Names

Rivers and Jones (1993) reported the locations of 21 place names in the upper San Antonio Valley and adjacent coast of Monterey County, California, that were noted by Salinan speakers in John Peabody Harrington\u27s field notes from 1922 to 1932. Surface reconnaissance and review of recently completed archaeological survey reports have led to the identification of 11 additional Salinan places in the upper San Antonio Valley and refinement in the location of three others. Archaeological sites in the vicinity of named places tentatively suggest that Salinan settlements are marked by clusters of small middens and bedrock mortars

An Addendum to Harrington's Northern Salinan Place Names

Rivers and Jones (1993) reported the locations of 21 place names in the upper San Antonio Valley and adjacent coast of Monterey County, California, that were noted by Salinan speakers in John Peabody Harrington's field notes from 1922 to 1932. Surface reconnaissance and review of recently completed archaeological survey reports have led to the identification of 11 additional Salinan places in the upper San Antonio Valley and refinement in the location of three others. Archaeological sites in the vicinity of named places tentatively suggest that Salinan settlements are marked by clusters of small middens and bedrock mortars