2009 Phase II Archaeological Investigations in the Riversdale (18PR390) Garden, Prince George’s County, MD

In the fall of 2009, archaeologists and students from the University of Maryland’s Center for Heritage Resource Studies, in conjunction with the Archaeology Program, Maryland National Capital Parks and Planning Commission, conducted phase II archaeological testing of a portion of the garden at the Federal-period Riversdale Mansion (18PR390). The goal of the excavation was to evaluate the impact of ongoing erosion on archaeological resources in the project area. Excavators dug a total of 4 units measuring five-foot square and another half-unit measuring 2.5-feet by five-feet. They recovered 4280 objects ranging in date from the early 19th century through the twentieth century. They also unearthed the remains of a large garden wall erected around 1805 as well as the foundation of a brick structure built before 1830. This report details the project activities, and recommends that M-NCCP continue to monitor the effects of erosion on these resources. It also suggests future research questions, should additional excavations prove necessary

Archaeological Testing at Bostwick (18PR951), New Driveway Project, Bladensburg, MD

In August of 2008, archaeologists and students at the Center for Heritage Resource Studies (CHRS) at the University of Maryland conducted a program of archaeological field survey at the historic Bostwick House. This survey resulted in the identification of six major activity areas of archaeological significance on the property. At this time it was decided that those six activity areas should receive special attention in any planning activities on the property. Historic Bostwick is located at the base of Lowndes Hill in Bladensburg, Maryland. Christopher Lowndes constructed the house around 1745. Lowndes was an early land developer as well as a merchant, shipbuilder, and slave trader, and he made Bladensburg the headquarters of his operation. The house continued to be occupied through the nineteenth and early twentieth centuries. The property underwent significant changes in the early twentieth century, and nearby urban development has impacted the landscape as well. Currently the property is managed by a partnership between the Town of Bladensburg and the University of Maryland‟s Historic Preservation Program. These partners plan to rehabilitate the standing house structure and to turn the house into a destination for education and other activities. In the spring of 2009, the Town of Bladensburg developed plans to re-route the existing driveway at the Bostwick House, and replace it with a permeable surface accessible to emergency vehicles. Although the proposed Area of Potential Effect (APE) did not directly intersect with one of the six areas identified in the previous survey, it was determined that the potential existed for intact cultural resources to exist in the APE due to its proximity to one of the areas identified. In June of 2009, archaeologists and students from CHRS excavated four STP‟s and two test units within the new driveway‟s APE. Additionally, previously surveyed units were reexamined. The excavations did not reveal the presence of cultural features that might shed light on the nature of the activities conducted in the adjacent area. Excavations resulted in the recovery of artifacts related to all of the eras of Bostwick‟s occupation and confirmed the richness of the archaeological record present on the grounds. In May of 2010, CHRS archaeologists monitored the grading of the APE as part of the process of ensuring the archaeological heritage of Bostwick, Bladensburg and the State of Maryland would not be compromised in the building of this necessary modern alteration of the house‟s landscape. The preservation plan allowed archaeologists from the University of Maryland to mitigate aspects of the construction plan that may have affected sensitive areas identified during the initial survey

The basal ganglia circuits, dopamine, and ambiguous word processing: A neurobiological account of priming studies in Parkinson's disease

Research into the processing of lexical ambiguities has provided a valuable paradigm for investigating the functional architecture of the language processing system in normal and neurologically impaired populations and specifically, how basal ganglia circuits and the neurotransmitter dopamine may act to enhance and/or suppress various meanings relative to the context in which the lexical ambiguity appears. In this review, we develop the hypothesis that an integrated basal ganglia thalamocortical circuit linking the striatum and inferior frontal cortex is involved in the enhancement and suppression of ambiguous word meanings when a lexical ambiguity is presented within a linguistic context. Reference to behavioral, neurophysiological, and neurochemical studies of subcortical function in both healthy populations and people with Parkinson's disease will be used to provide further support for the proposal that the subcortex is integrally involved in ambiguous word processing. (JINS, 2008, 14, 351–364.

Exploring the biochemistry at the extracellular redox frontier of bacterial mineral Fe(III) respiration

Many species of the bacterial Shewanella genus are notable for their ability to respire in anoxic environments utilizing insoluble minerals of Fe(III) and Mn(IV) as extracellular electron acceptors. In Shewanella oneidensis, the process is dependent on the decahaem electron-transport proteins that lie at the extracellular face of the outer membrane where they can contact the insoluble mineral substrates. These extracellular proteins are charged with electrons provided by an inter-membrane electron-transfer pathway that links the extracellular face of the outer membrane with the inner cytoplasmic membrane and thereby intracellular electron sources. In the present paper, we consider the common structural features of two of these outer-membrane decahaem cytochromes, MtrC and MtrF, and bring this together with biochemical, spectroscopic and voltammetric data to identify common and distinct properties of these prototypical members of different clades of the outer-membrane decahaem cytochrome superfamily