Archeological Investigations for Fort Stabilization and Restoration, For McKavett State Historical Park, Menard County, Texas: 1978-1990 Seasons

The U.S. Army occupations at Fort McKavett from 1853 until 1859 and from 1868 until 1883 were part of Texas\u27s frontier defense. During the Civil War and from 1883 until the present, civilians have inhabited and used the fort buildings, creating the small town of Fort McKavett. The Texas Parks and Wildlife Department developed part of the town as a state historical park, restoring this property to its appearance during the second military occupation. Archeological investigations at the park between 1978 and 1990 focused on recovering architectural data and artifacts to support restoration, stabilization, and interpretation of the military occupations. The archeological work varied from surface collection to large-scale excavations, the latter generally confined to Officers\u27 Quarters 4, but the most common approach was limited testing in building foundations and suspected architectural features. Work took place in 16 structures. Most of the archeological work focused on officers\u27 quarters, although a few enlisted mens\u27 barracks and other buildings also were tested. Relatively few temporally diagnostic artifacts were recovered in the vicinity of walls, fireplaces, and other architectural features, and only sparse military and military-period artifacts were found. The 372 military and military-period artifacts recovered from the post-1977 work at Fort McKavett and described in this report represent less than 0.01 percent of the total artifact assemblage and likely represent only a small proportion of the trash generated by the military occupations. Much of that trash probably was disposed of and possibly burned off-site or, if on-site, in pit latrines or other deep features not excavated during the 1978-1990 work. Military conduct, discipline, and policing may have functioned in keeping public spaces at this frontier military fort relatively litter free and thus artifact poor

Occupational Asthma and Contact Dermatitis in a Spray Painter after Introduction of an Aziridine Cross-Linker.

A 23-year-old spray painter developed contact dermatitis and respiratory difficulty characterized by small airways obstruction shortly after the polyfunctional aziridine cross-linker CX-100 began to be used in his workplace as a paint activator. The symptoms resolved after he was removed from the workplace and was treated with inhaled and topical steroids. Painters may have an increased risk of asthma due to exposure to a variety of agents, such as isocyanates, alkyd resins, and chromates. This case illustrates the importance of using appropriate work practices and personal protective equipment to minimize exposure. Occupational asthma is diagnosed by a history of work-related symptoms and exposure to known causative agents. The diagnosis is confirmed by serial pulmonary function testing or inhalational challenge testing. The risk of asthma attributable to occupational exposures is probably underappreciated due to underreporting and to inappropriate use of narrow definitions of exposure in epidemiologic studies of attributable risk

N-Substituted 2-Aminobiphenylpalladium Methanesulfonate Precatalysts and Their Use in C–C and C–N Cross-Couplings

A series of phosphine-ligated palladium precatalysts based on N-methyl- and N-phenyl-2-aminobiphenyl have been developed. Substitution at the nitrogen center prevents the presence of traces of aminobiphenyls that contain a free −NH[subscript 2] group from contaminating cross-coupling products. These precatalysts produce N-substituted carbazoles upon activation, which cannot consume starting materials. These precatalysts were efficiently generated from 2-aminobiphenyl with minimal purification and found to be highly effective in Suzuki–Miyaura and C–N cross-coupling reactions.National Institutes of Health (U.S.) (GM46059)National Institutes of Health (U.S.) (GM58160

Creating a Community Classroom: Strategies to Promote Inclusion and Reduce Bullying in Early Childhood

Research suggests that young children with disabilities often fall victim to bullying because of a lack of social competence and social skills necessary for consistent engagement with peers. This article focuses on a comprehensive approach to classroom management and offers important strategies for a multilevel positive behavioral support plan. The positive behavioral support plan is embedded in the daily curriculum and includes strategies that enhance cooperative learning and socialization experiences, increases academic readiness, and supports academic success

Sweetclover on Iowa Farms

During the past 30 years sweetclover has changed from its lowly position as a roadside weed to a respectable place among farm crops. The rise in importance of this crop has been the direct result of the realization that sweetclover fills a most important role in building and maintaining our soils—making possible large yields of corn, soybeans and other crops

Force dependent fragility in RNA hairpins

We apply Kramers theory to investigate the dissociation of multiple bonds under mechanical force and interpret experimental results for the unfolding/refolding force distributions of an RNA hairpin pulled at different loading rates using laser tweezers. We identify two different kinetic regimes depending on the range of forces explored during the unfolding and refolding process. The present approach extends the range of validity of the two-states approximation by providing a theoretical framework to reconstruct free-energy landscapes and identify force-induced structural changes in molecular transition states using single molecule pulling experiments. The method should be applicable to RNA hairpins with multiple kinetic barriers.Comment: Latex file, 4 pages+3 figure

Snowier Winters Extend Autumn Availability of High-quality Forage for Caribou in Arctic Alaska

Caribou (Rangifer tarandus) rely on the short Arctic growing season to restore body condition, support the demands of lactation, and prepare for the long arctic winter, making them susceptible to even small changes in forage availability or quality. Body condition in the summer and autumn is linked to winter survival rates and fecundity in cows, critical factors in the productivity of caribou populations. Climate change predictions of warmer and wetter northern winters suggest increased snowfall over Alaska’s North Slope, which has recently been verified between 1995 and 2017. However, a comprehensive analysis of how deeper snow will affect caribou forage quality is absent across Alaska. In this study, we quantify how snow depth alters the quality and seasonality of caribou forage using a long-term (24 yr) International Tundra Experiment snow depth manipulation to evaluate how winter climate change scenarios may affect tussock tundra systems in northern Alaska. Deeper snow in prior winters leads to increases in growing season leaf N and digestible protein (DP) in deciduous shrubs (and Betula spp.) and graminoids (Carex spp. and Eriophorum spp.), but not evergreen dwarf shrubs (Rhododendron spp. and Vaccinium spp.). Dry matter digestibility varied among species with small differences (\u3c5%) associated with snow depth. Most striking was the discovery that deeper snow in the prior winter increased the duration of DP levels above the minimum threshold for protein gain in caribou by as much as 25 d in Salix pulchra and 6–9 d in Betula nana and Carex bigelowii in late summer and early autumn. Consequently, deeper winter snow may provide an extended window of opportunity for foraging and the accumulation of lean body mass and fat reserves which promote winter survival and successful calving the following spring and potentially improve the productivity of caribou in northern Alaska

The Missing Angle: Ecosystem Consequences of Phenological Mismatch

Climate change leads to unequal shifts in the phenology of interacting species, such as consumers and their resources, leading to potential phenological mismatches. While studies have investigated how phenological mismatch affects wild populations, we still lack studies and a framework for investigating how phenological mismatch affects ecosystems, particularly nutrient cycling

The demonstration of a herpesvirus, related to bovine herpesvirus 1, in reindeer with ulcerative and necrotizing lesions of the upper alimentary tract and nose

In 11 male reindeer, all esposed to transportation stress, signs of conjunctivitis and later on ulcerative and necrotizing lesions of the mucosa of the nostrils and mouth were recorded. Blood and secretions from the nose were sampled. Antibodies to bovine herpesvirus 1 (BHV-1) were detected in 2 animals. No animal had antibodies to bovine viral diarrhoea virus (BVDV). Virus isolation was negative. The sampling was repeated 2 weeks later and complemented with biopsies from the mouth lesions, fixed in formalin. At this occasion 3 animals were seropositive to BHV-1 and in biopsies from 2 of these intranuclear herpesvirus-like particles were found by means of electron microscopy. Four animals, 3 of them seropositive, were treated with cortison during 8 days. The size of the ulcers in the mouth increased in all animals. A herpesvirus was isolated from 3 of them at 10 different occasions. The ultrastructural investigation of the virus suspension demonstrated the presence of typical herpesvirus particles. On day 11 all 4 animals suffered from a severe diarrhoea and anorexia. On day 12 one animal died and on day 13 post challenge with cortison two additional animals died. The remaining animal was slaughtered on day 13. Bacteriological investigation revealed growth of Fusobacterium necrophorum from the spleen and oral wounds of all 4 animals. The animals were obviously subjected to an infection with a herpesvirus colsely related to BHV-1. Virus could be liberated by cortison treatment. It is possible that infections with the found herpesvirus, and the lesions caused by it, may be the background to earlier recorded severe outbreaks of necrobacillosis of the alimentary tract in reindeer herds