The State of Coral Reef Ecosystems of Southeast Florida

The northern extension of the Florida reef tract and a complex of limestone ridges run parallel to the subtropical Atlantic coastline of southeast Florida. Spanning 170 km from the northern border of Biscayne National Park (BNP) in Miami-Dade County to the St. Lucie Inlet in Martin County, the reefs and hardbottom areas in this region support a rich and diverse biological community (Figure 5.1). Nearshore reef habitats in southeast Florida include hardbottom areas, patch reefs and worm reefs (Phragmatopoma spp.) exhibiting abundant octocoral, macroalgae, stony coral and sponge assemblages. Offshore, coral reef associated biotic assemblages occur on linear Holocene Acropora palmata mid-shelf and shelf margin reefs that extend from Miami Dade County to Palm Beach County (Lighty, 1977; Figure 5.2). Anastasia Formation limestone ridges and terraces colonized by reef biota characterize the reefs from Palm Beach County to Martin County (Cooke and Mossom, 1929). The coastal region of southeast Florida is highly developed, containing one third of Florida’s population of 16 million people (U.S. Census Bureau, 2006). Many southeast Florida reefs are located just 1.5 km from this urbanized shoreline. Despite their unique position as the highest latitude reefs along the western Atlantic seaboard, the reefs of southeast Florida have only recently received limited scientific and resource management attention. Andrews et al. (2005) discussed the reefs of southeast Florida and the critical need to implement actions that fill resource knowledge gaps and address conservation and threats to reef health. This report further examines and updates the list of stressors imperiling the health of southeast Florida’s reefs, and presents information gained from new research, monitoring and management efforts to determine the extent and condition of reef resources in this distinctive region

Upcycling Single-Use Polyethylene into High-Quality Liquid Products

Our civilization relies on synthetic polymers for all aspects of modern life; yet, inefficient recycling and extremely slow environmental degradation of plastics are causing increasing concern about their widespread use. After a single use, many of these materials are currently treated as waste, underutilizing their inherent chemical and energy value. In this study, energy-rich polyethylene (PE) macromolecules are catalytically transformed into value-added products by hydrogenolysis using well-dispersed Pt nanoparticles (NPs) supported on SrTiO3 perovskite nanocuboids by atomic layer deposition. Pt/SrTiO3 completely converts PE (Mn = 8000− 158,000 Da) or a single-use plastic bag (Mn = 31,000 Da) into high-quality liquid products, such as lubricants and waxes, characterized by a narrow distribution of oligomeric chains, at 170 psi H2 and 300 °C under solvent-free conditions for reaction durations up to 96 h. The binding of PE onto the catalyst surface contributes to the number averaged molecular weight (Mn) and the narrow polydispersity (Đ) of the final liquid product. Solidstate nuclear magnetic resonance of 13C-enriched PE adsorption studies and density functional theory computations suggest that PE adsorption is more favorable on Pt sites than that on the SrTiO3 support. Smaller Pt NPs with higher concentrations of undercoordinated Pt sites over-hydrogenolyzed PE to undesired light hydrocarbons

Involvement of inhibitory dopamine-2 receptors in resting bradycardia in exercise-conditioned rats

The purpose of this investigation was to examine the underlying cause for the resting bradycardia and lower resting blood pressure demonstrated in conscious rats that performed 12 wk of treadmill exercise conditioning. The influence of inhibitory dopamine (DA2) receptors and α2-adrenoceptors, which are known to mediate bradycardia and hypotension, was assessed in exercise-conditioned (EC) and nonexercised conditioned (NC) rats. To accomplish this, preferential DA2 and α2-agonists and antagonists were administered at rest to conscious rats after they participated in an exercise conditioning program. The results obtained with the DA2 antagonist metoclopramide (15 mg/kg ip) alone suggest that there is physiological activation of cardiovascular DA2 receptors in EC rats but not in NC rats. Furthermore, the results obtained with the DA2 agonist bromocriptine (1.5 mg/kg ip) suggest that the DA2 receptor-mediated bradycardia and hypotension are greater in EC rats than in NC rats. In addition, heart rate and blood pressure responses to the α2-agonist clonidine (0.1 mg/kg ip) and antagonist yohimbine (1 mg/kg ip) were not different between EC and NC rats. These data suggest that enhanced DA2 receptor influence accounts, in part, for the resting bradycardia and lower resting blood pressure demonstrated in EC rats after 12 wk of exercise conditioning

High Touch Research: Building Community for Those Living with HIV

Participatory action research can be a research methodology that seeks to offer relational processes that develop high touch research relationships, create co-empowerment, while fostering resiliency and strength, within the HIV community. The Calgary HIV Social Society (CHSS) in Calgary, Alberta, Canada co-developed with peer-researchers at Mount Royal University, a progressive form of action-oriented research that allowed the HIV community to develop and provide social gatherings to reduce the impact of stigma and isolation. The research project was developed with the community of people living with HIV to reduce the impact of isolation and stigma. The focus of the research was to better understand how social gatherings could improve the quality of life for those living with HIV. The action-oriented methodology allowed for HIV peer-researchers to bring their expertise on what was needed to reduce stigma and isolation. The HIV social support community created participatory action research processes that successfully contributed to building an inclusive, community for people living with HIV. This paper will share the themes that acknowledge the significant impact that a HIV high touch relationship research community can have for those, who face the barriers of isolation and stigma by increasing community connection, reducing financial constraints that limit participation, while increasing mental health wellness

Epithelial lacrimal gland tumors: pathologic classification and current understanding

OBJECTIVE: To apply the updated epithelial salivary gland classification scheme to a large cohort of lacrimal gland tumors so as to provide an updated lacrimal gland tumor classification scheme. METHODS: A retrospective multicenter cohort study of 118 cases of epithelial neoplasia was undertaken. Main outcome measures included pathologic analysis, subtyping, and survival. RESULTS: Of 118 cases, 17 (14%) were reclassified using the proposed expanded classification scheme based on the current World Health Organization classification of salivary gland tumors. The most frequent neoplasms were pleomorphic adenoma and adenoid cystic carcinoma, of which we highlight more unusual histologic features. Three tumors were found to be unclassifiable with the updated scheme, with 2 having histologically malignant features. Deficiencies and variations in pathologic assessment were noted. Variation in the histologic findings of pleomorphic adenoma and assessment of the extent of invasion of carcinoma ex pleomorphic adenoma were highlighted. CONCLUSIONS: The use of the more histologically diverse classification of salivary gland tumors can be successfully applied to the epithelial lacrimal gland neoplasms. This expanded classification system led to reclassifying 14% of cases. Currently, there are no consistent pathologic standards for processing and evaluating these lesion

Upcycling Single-Use Polyethylene into High-Quality Liquid Products

Our civilization relies on synthetic polymers for all aspects of modern life; yet, inefficient recycling and extremely slow environmental degradation of plastics are causing increasing concern about their widespread use. After a single use, many of these materials are currently treated as waste, underutilizing their inherent chemical and energy value. In this study, energy-rich polyethylene (PE) macromolecules are catalytically transformed into value-added products by hydrogenolysis using well-dispersed Pt nanoparticles (NPs) supported on SrTiO3 perovskite nanocuboids by atomic layer deposition. Pt/SrTiO3 completely converts PE (Mn = 8000–158,000 Da) or a single-use plastic bag (Mn = 31,000 Da) into high-quality liquid products, such as lubricants and waxes, characterized by a narrow distribution of oligomeric chains, at 170 psi H2 and 300 °C under solvent-free conditions for reaction durations up to 96 h. The binding of PE onto the catalyst surface contributes to the number averaged molecular weight (Mn) and the narrow polydispersity (Đ) of the final liquid product. Solid-state nuclear magnetic resonance of 13C-enriched PE adsorption studies and density functional theory computations suggest that PE adsorption is more favorable on Pt sites than that on the SrTiO3 support. Smaller Pt NPs with higher concentrations of undercoordinated Pt sites over-hydrogenolyzed PE to undesired light hydrocarbons