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University of New Hampshire

7 ARTICLES PUBLISHED IN JoVE

Education

¹Mechanical Engineering Department, University of New Hampshire

An echo particle image velocimetry (EPIV) system capable of acquiring two-dimensional fields of velocity in optically opaque fluids or through optically opaque geometries is described, and validation measurements in pipe flow are reported.

Environment

A Noninvasive Method For In situ Determination of Mating Success in Female American Lobsters (Homarus americanus)

Jason S Goldstein¹, Tracy L Pugh^1,2, Elizabeth A Dubofsky¹, Kari L Lavalli³, Michael Clancy⁴, Winsor H Watson III¹

¹Department of Biological Sciences, University of New Hampshire, ²Massachusetts Division of Marine Fisheries, ³Division of Natural Sciences & Mathematics, College of General Studies, Boston University, ⁴Rhode Island Nursing Institute, Middle College

Fishery-induced changes to exploited crustacean fisheries, such as the American lobster fishery, could potentially influence their reproductive dynamics, leading to a reduction in mating success. This study's goal was to develop a noninvasive method for ascertaining the mating success of female lobsters that may be physiologically or functionally mature.

JoVE Journal

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

Adam S. Wymore¹, Bianca Rodríguez-Cardona¹, William H. McDowell¹

¹Department of Natural Resources and the Environment, University of New Hampshire

Dissolved organic matter provides an important source of energy and nutrients to stream ecosystems. Here we demonstrate a field-based method to manipulate the ambient pool of dissolved organic matter in situ through easily replicable nutrient pulses.

Biology

A Method for Extracting Pigments from Squid Doryteuthis pealeii

Christopher W. DiBona¹, Thomas L. Williams¹, Sean R. Dinneen¹, Stephanie F. Jones Labadie¹, Leila F. Deravi^1,2

¹Department of Chemistry, University of New Hampshire, ²Materials Science Program, University of New Hampshire

A protocol for the extraction of pigments from the nanostructured granules in squid Doryteuthis pealeii chromatophores is presented.

JoVE Core

Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils

Gregory B. Lawrence¹, Ivan J. Fernandez², Paul W. Hazlett³, Scott W. Bailey⁴, Donald S. Ross⁵, Thomas R. Villars⁶, Angelica Quintana⁷, Rock Ouimet⁸, Michael R. McHale¹, Chris E. Johnson⁹, Russell D. Briggs¹⁰, Robert A. Colter¹¹, Jason Siemion¹, Olivia L. Bartlett¹², Olga Vargas¹³, Michael R. Antidormi¹, Mary M. Koppers⁹

¹New York Water Science Center, U.S. Geological Survey, ²School of Forest Resources, University of Maine, ³Natural Resources Canada, Canadian Forest Service, ⁴Northern Research Station, U.S. Forest Service, ⁵Department of Plant and Soil Science, University of Vermont, ⁶Ottauquechee NRCD, USDA Natural Resources Conservation Service, ⁷Green Mountain National Forest, U.S. Forest Service, ⁸Direction de la Recherche Forestière, Ministère du Québec, ⁹Department of Civil and Environmental Engineering, Syracuse University, ¹⁰Division of Environmental Science, SUNY College of Environmental Science and Forestry, ¹¹White Mountain National Forest, U.S. Forest Service, ¹²Natural Resources and Earth System Sciences, University of New Hampshire, ¹³Greenwich, NY Field Office, USDA Natural Resources Conservation Service

Repeated soil sampling has recently been shown to be an effective way to monitor forest soil change over years and decades. To support its use, a protocol is presented that synthesizes the latest information on soil resampling methods to aid in the design and implementation of successful soil monitoring programs.

Environment

An Optimized Rhizobox Protocol to Visualize Root Growth and Responsiveness to Localized Nutrients

Jennifer E. Schmidt¹, Carolyn Lowry², Amelie C.M. Gaudin¹

¹Department of Plant Sciences, University of California at Davis, ²Department of Natural Resources and the Environment, University of New Hampshire

Visualizing and measuring root growth in situ is extremely challenging. We present a customizable rhizobox method to track root development and proliferation over time in response to nutrient enrichment. This method is used to analyze maize genotypic differences in root plasticity in response to an organic nitrogen source.

Chemistry

Application of Voltage in Dynamic Light Scattering Particle Size Analysis

Tianyu Ren^*1, Emma J. Roberge^*2, John R. Csoros¹, W. Rudolph Seitz¹, Eva Rose M. Balog³, Jeffrey Mark Halpern²

¹Department of Chemistry, University of New Hampshire, ²Department of Chemical Engineering, University of New Hampshire, ³Department of Chemistry and Physics, University of New England

Here, a protocol to apply voltage to solution during dynamic light scattering particle size measurements with the intent to explore the effect of voltage and temperature changes on polymer aggregation is presented.