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United States Department of Agriculture: A cabinet department in the Executive Branch of the United States Government concerned with improving and maintaining farm income and developing and expanding markets for agricultural products. Through inspection and grading services it safeguards and insures standards of quality in food supply and production.
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 JoVE Chemistry

Construction of Models for Nondestructive Prediction of Ingredient Contents in Blueberries by Near-infrared Spectroscopy Based on HPLC Measurements

1United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 2Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3Institute of Agriculture, Tokyo University of Agriculture and Technology


JoVE 53981

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 JoVE Immunology and Infection

Application of Long-term cultured Interferon-γ Enzyme-linked Immunospot Assay for Assessing Effector and Memory T Cell Responses in Cattle

1Infectious Bacterial Diseases Research Unit, National Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, 2Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, 3UK Veterinary Laboratories Agency, 4Visual Services, National Centers for Animal Health, Animal and Plant Health Inspection Service, United States Department of Agriculture


JoVE 52833

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 JoVE Biology

Using High Resolution Computed Tomography to Visualize the Three Dimensional Structure and Function of Plant Vasculature

1U.S. Department of Agriculture, 2Department of Viticulture and Enology, University of California - Davis, 3Hawkesbury Institute for the Environment, University of Western Sydney, 4Advanced Light Source, Lawrence Berkeley National Lab, 5Citrus Research & Education Center, University of Florida


JoVE 50162

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 JoVE Biology

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm

1School of Environmental and Forest Sciences, University of Washington, 2Center for Agricultural and Rural Development, Department of Economics, Iowa State University, 3Department of Civil, Architectural, and Environmental Engineering, North Carolina A&T University, 4Iowa Geological and Water Survey


JoVE 4009

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 JoVE Environment

Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability

1Division of Physical Therapy, Department of Orthopedics & Rehabilitation, University of New Mexico, 2Department of Ecosystem Science and Management, University of Wyoming, 3School of Pharmacy, University of Wyoming, 4Department of Environmental and Radiological Health Sciences, Colorado State University, 5Center for Environmental Medicine, Colorado State University, 6College of Pharmacy, California Northstate University


JoVE 52715

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 JoVE Immunology and Infection

Glass Wool Filters for Concentrating Waterborne Viruses and Agricultural Zoonotic Pathogens

1Wisconsin Water Science Center, United States Geological Survey, 2University of Wisconsin – Madison, 3Agricultural Research Service, United States Department of Agriculture, 4Alaska Science Center, United States Geological Survey


JoVE 3930

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 JoVE Bioengineering

Multi-analyte Biochip (MAB) Based on All-solid-state Ion-selective Electrodes (ASSISE) for Physiological Research

1Department of Agricultural and Biological Engineering, Birck-Bindley Physiological Sensing Facility, Purdue University, 2NASA Ames Research Center, 3Department of Chemistry, Pennsylvania State University Hazleton, 4Cooley LLP, 5NASA Life and Physical Sciences, Human Exploration and Operations Mission Directorate, NASA Headquarters


JoVE 50020

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 JoVE Environment

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data

1Crops Pathology and Genetics Research Unit, United States Department of Agriculture-Agricultural Research Service, 2Department of Viticulture & Enology, University of California, Davis, 3Faculty of Agricultural Sciences, University of Chile, 4Atmospheric Science, University of California, Davis, 5URS Corporation Australia Pty. Ltd.


JoVE 50666

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 JoVE Environment

Measurement of Greenhouse Gas Flux from Agricultural Soils Using Static Chambers

1Office of Sustainability, University of Wisconsin-Madison, 2Department of Soil Science, University of Wisconsin-Madison, 3Department of Agronomy, University of Wisconsin-Madison, 4Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, 5USDA-ARS Dairy Forage Research Center, 6USDA-ARS Pasture Systems Watershed Management Research Unit


JoVE 52110

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 JoVE In-Press

A New Method for Qualitative Multiscale Analysis of Bacterial Biofilms on Filamentous Fungal Colonies Using Confocal and Electron Microscopy

1Interactions Arbres – Microorganismes, UMR1136, INRA Université de Lorraine, 2Biosciences Division, Oak Ridge National Laboratory, 3Ecologie et Ecophysiologie Forestières - PTEF, UMR 1137, INRA Université de Lorraine

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JoVE 54771

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 JoVE Environment

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

1Department of Animal Science, Pennsylvania State University, 2C-Lock, Inc. Rapid City, SD, 3Color Productions, State College, PA, 4Departamento de Zootecnia, Universidade Estadual de Maringá


JoVE 52904

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 JoVE Environment

Integrating Remote Sensing with Species Distribution Models; Mapping Tamarisk Invasions Using the Software for Assisted Habitat Modeling (SAHM)

1Natural Resource Ecology Laboratory, Colorado State University, 2U.S. Geological Survey, Fort Collins Science Center, 3U.S. Geological Survey - U.S. Department of the Interior, North Central Climate Science Center


JoVE 54578

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 JoVE Immunology and Infection

Fluorescence in situ Hybridizations (FISH) for the Localization of Viruses and Endosymbiotic Bacteria in Plant and Insect Tissues

1Department of Entomology, Volcani Center, 2Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, 3Department of Applied Sciences, Institute for Adriatic Crops and Karst Reclamation, 4The Institute of Plant Sciences, Volcani Center


JoVE 51030

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 Science Education: Essentials of General Chemistry

Using a pH Meter

JoVE Science Education

Source: Laboratory of Dr. Zhongqi He - United States Department of Agriculture

Acids and bases are substances capable of donating protons (H+) and hydroxide ions (OH-), respectively. They are two extremes that describe chemicals. Mixing acids and bases can cancel out or neutralize their extreme effects. A substance that is neither acidic nor basic is neutral. The values of proton concentration ([H+]) for most solutions are inconveniently small and difficult to compare so that a more practical quantity, pH, has been introduced. pH was originally defined as the decimal logarithm of the reciprocal of the molar concentration of protons , but was updated to the decimal logarithm of the reciprocal of the hydrogen ion activity . The former definition is now occasionally expressed as p[H]. The difference between p[H] and pH is quite small. It has been stated that pH = p[H] + 0.04. It is common practice to use the term 'pH' for both types of measurements. The pH scale typically ranges from 0 to 14. For a 1 M solution of a strong acid, pH=0 and for a 1 M solution of a strong base, pH=14. Thus, measured pH values will lie mostly in the rang

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 JoVE Environment

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

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