Harvesting technology and catch-to-biomass dependence: The case of small pelagic fish

This note deals with a harvesting model for a single stock fishery. In the case of small pelagic fish it seems reasonable to consider harvest functions depending nonlinearly on fishing effort and on fish stock. Empirical evidence about these fish species suggests that marginal catch does not necessarily react in a linear way to changes in fishing effort and fish stock levels. This is in contradiction with traditional fishery models where catch-to-input marginal productivities are normally assumed to be constant. While allowing for non linearities in both catch-to-effort and catch-to-stock parameters, this note extends the traditional analysis by focusing on the dependence of the stationary solutions upon the nonlinear catch-to-biomass parameter. Given the emphasis on the case of small pelagic fish, the analysis considers positive but small values for the catch-to-stock parameter.small pelagic fisheries, harvesting functions, Cobb-Douglas production function, optimal control, maximum principle.

Clinical Research: From Idea to Publication

Julio A. Ramirez, M.D., FACP, Professor of Medicine/Associate Professor of Microbiology and Immunology; Chief, Division of Infectious Diseases; Director, Infectious Diseases Fellowship Training Program and Founding Director, Global Health Initiative at The University of Louisville, presented Clinical Research: From Idea to Publication at University of Louisville Department of Medicine Grand Rounds on February 15, 2018. The talk focused on performing an overview of clinical study designs, describing the planning and performing of a clinical study, reviewing the process for statistical and clinical analysis, and presenting the structure of a Clinical Research Coordinating Center

Defining the Burden of COVID-19 in the Kentuckiana Area: Incidence, Epidemiology & Clinical Outcomes of Patients with COVID-19

Rationale: Early evaluation of the burden of disease that COVID-19 may produce in a community is critical to appropriately allocate resources for COVID-19 prevention and treatment. Objective: The primary objective of this study is to define the incidence, epidemiology, and clinical outcomes of patients with COVID-19 in the Louisville, Kentucky and southern Indiana region (Kentuckiana) of the USA. Methods: This will be a retrospective observational study of patients in the Kentuckiana region with the diagnosis of COVID-19