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Sample Size: The number of units (persons, animals, patients, specified circumstances, etc.) in a population to be studied. The sample size should be big enough to have a high likelihood of detecting a true difference between two groups. (From Wassertheil-Smoller, Biostatistics and Epidemiology, 1990, p95)

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

1Jülich Centre for Neutron Science Outstation at MLZ, Forschungszentrum Jülich GmbH, 2Department of Chemistry, Louisiana State University, 3Jülich Centre for Neutron Science JCNS-1 & Institute of Complex Systems ICS-1, Forschungszentrum Jülich GmbH, 4Central Institute of Engineering, Electronics and Analytics — Electronic Systems (ZEA-2), Forschungszentrum Jülich GmbH, 5Central Institute of Engineering, Electronics and Analytics — Engineering and Technology (ZEA-1), Forschungszentrum Jülich GmbH

JoVE 54639


 Bioengineering

Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity

1Department of Ecosystem Science and Management, Pennsylvania State University, 2Department of Geography and Environmental Sustainability, State University of New York, Oneonta, 3Department of Geology and Environmental Science, University of Pittsburgh

Video Coming Soon

JoVE 57181


 JoVE In-Press

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

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

JoVE 54815


 Environment

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris

1Department of Physical and Environmental Sciences, Texas A&M University-Corpus Christi, 2Department of Earth and Atmospheric Sciences, Saint Louis University, 3Department of Oceanography and Coastal Sciences, Louisiana State University, 4Department of Biology, University of Central Florida

Video Coming Soon

JoVE 57969


 JoVE In-Press

Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction

1Mineral Physics Institute, Department of Geoscience, Stony Brook University, 2Geological Engineering, Department of Civil and Environmental Engineering, University of Wisconsin-Madison, 3Rock and Ice Physics Laboratory, Department of Earth Sciences, University College London, 4Department of Chemistry, Stony Brook University

JoVE 57555


 Environment

Identifying DNA Mutations in Purified Hematopoietic Stem/Progenitor Cells

1Greehey Children's Cancer Research Institute, UT Health Science Center at San Antonio, 2Department of Cellular and Structural Biology, UT Health Science Center at San Antonio, 3Department of Pathology, UT Health Science Center at San Antonio, 4Department of Microbiology, UT Health Science Center at San Antonio, 5Cancer Therapy and Research Center, UT Health Science Center at San Antonio

JoVE 50752


 Immunology and Infection

Establishment of a Clinic-based Biorepository

1Affiliated Dermatology & Affiliated Laboratories, Midwestern University Osteopathic Postdoctoral Training Institute, Midwestern University, 2Department of Microbiology & Immunology, Arizona College of Osteopathic Medicine, Midwestern University, 3Biomedical Sciences Program, College of Health Sciences, Midwestern University

JoVE 55583


 Medicine

Making Record-efficiency SnS Solar Cells by Thermal Evaporation and Atomic Layer Deposition

1Department of Mechanical Engineering, Massachusetts Institute of Technology, 2Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, 3School of Engineering and Applied Sciences, Harvard University, 4Department of Materials Science and Engineering, Massachusetts Institute of Technology, 5Department of Chemistry & Chemical Biology, Harvard University

JoVE 52705


 Engineering

High Resolution 3D Imaging of the Human Pancreas Neuro-insular Network

1Department of Pathology, Immunology and Experimental Medicine, University of Florida, 2Heller School for Social Policy and Management, Brandeis University, 3Department of Medicine, College of Medicine, University of Florida, 4Department of Biomedical Engineering, College of Engineering, University of Florida, 5Department of Pediatrics, College of Medicine, University of Florida

JoVE 56859


 Bioengineering

Blood Withdrawal I

JoVE 10246

Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN

Blood collection is a common requirement for research studies that involve mice and rats. The method of blood withdrawal in mice and rats is dependent upon the volume of blood needed, the frequency of the sampling, the health status of the animal to be bled, and the skill level of the technician.1 All methods discussed-retro-orbital sinus bleeds, initial tail snip bleeds, and intracardiac bleeds-require the use of a general anesthesia.


 Lab Animal Research

The Neuromuscular Junction: Measuring Synapse Size, Fragmentation and Changes in Synaptic Protein Density Using Confocal Fluorescence Microscopy

1Physiology and Bosch Institute, University of Sydney, 2Motor Neuron Disease Research Group, Australian School of Advanced Medicine, Macquarie University, 3Advanced Microscopy Facility, Bosch Institute, University of Sydney

JoVE 52220


 Neuroscience

Use of Chironomidae (Diptera) Surface-Floating Pupal Exuviae as a Rapid Bioassessment Protocol for Water Bodies

1Department of Entomology, University of Minnesota, 2Biology, Chemistry & Physics, and Mathematics Department, Northern State University, 3Environmental Analysis and Outcomes Division, Minnesota Pollution Control Agency, 4RMB Environmental Laboratories, Inc.

JoVE 52558


 Environment

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