Show Advanced Search

REFINE YOUR SEARCH:

Containing Text
- - -
+
Filter by author or institution
GO
Filter by publication date
From:
October, 2006
Until:
Today
Filter by journal

Filter by science education

 
 
Gas, Natural: A combustible, gaseous mixture of low-molecular weight Paraffin hydrocarbons, generated below the surface of the earth. It contains mostly Methane and Ethane with small amounts of Propane; Butanes; and higher hydrocarbons, and sometimes Nitrogen; Carbon dioxide; Hydrogen sulfide; and Helium. (from McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

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


 Environment

Conducting Miller-Urey Experiments

1School of Chemistry and Biochemistry, Georgia Institute of Technology, 2Earth-Life Science Institute, Tokyo Institute of Technology, 3Institute for Advanced Study, 4Astromaterials Research and Exploration Science Directorate, NASA Johnson Space Center, 5Goddard Center for Astrobiology, NASA Goddard Space Flight Center, 6Geosciences Research Division, Scripps Institution of Oceanography, University of California at San Diego

JoVE 51039


 Chemistry

Determining Rate Laws and the Order of Reaction

JoVE 10193

Source: Laboratory of Dr. Neal Abrams — SUNY College of Environmental Science and Forestry

All chemical reactions have a specific rate defining the progress of reactants going to products. This rate can be influenced by temperature, concentration, and the physical properties of the reactants. The rate also includes the intermediates and transition states that are formed but are neither the reactant nor the product. The rate law defines the role of each reactant in a reaction and can be used to mathematically model the time required for a reaction to proceed. The general form of a rate equation is shown below:     where A and B are concentrations of different molecular species, m and n are reaction orders, and k is the rate constant. The rate of nearly every reaction changes over time as reactants are depleted, making effective collisions less likely to occur. The rate constant, however, is fixed for any single reaction at a given temperature. The reaction order illustrates the number of molecular species involved in a reaction. It is very important to know the rate law, including rate constant and reaction order, which can only be deter


 General Chemistry

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor

1Bioprocesses Department, Laboratory of Environmental Biotechnology, Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, 2Laboratory of Molecular Biology, Escuela Superior de Medicina, Instituto Politécnico Nacional

JoVE 52956


 Environment

Proton Exchange Membrane Fuel Cells

JoVE 10022

Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University

The United States consumes a large amount of energy – the current rate is around 97.5 quadrillion BTUs annually. The vast majority (90%) of this energy comes from non-renewable fuel sources. This energy is used for electricity (39%), transportation (28%), industry (22%), and residential/commercial use (11%). As the world has a limited supply of these non-renewable sources, the United States (among others) is expanding the use of renewable energy sources to meet future energy needs. One of these sources is hydrogen. Hydrogen is considered a potential renewable fuel source, because it meets many important criteria: it’s available domestically, it has few harmful pollutants, it’s energy efficient, and it’s easy to harness. While hydrogen is the most abundant element in the universe, it is only found in compound form on Earth. For example, it is combined with oxygen in water as H2O. To be useful as a fuel, it needs to be in the form of H2 gas. Therefore, if hydrogen is to be used as a fuel for cars or other electronics, H2 needs to be made first. Thusly, hydrogen is often called an “energy carrier” rather than a “fuel.”

Workflow Based on the Combination of Isotopic Tracer Experiments to Investigate Microbial Metabolism of Multiple Nutrient Sources

1UMR SPO, INRA, SupAgroM, Université de Montpellier, 2IWBT Stellenbosch University, 3PILI, Toulouse White Biotechnology

Video Coming Soon

JoVE 56393


 JoVE In-Press

Engineering 3D Cellularized Collagen Gels for Vascular Tissue Regeneration

1Laboratory for Biomaterials and Bioengineering, Department Min-Met-Materials Eng & CHU de Québec Research Center, Canada Research Chair I for the Innovation in Surgery, Laval University, 2NSERC CREATE Program for Regenerative Medicine (NCPRM), Laval University, 3Department Electronics, Information and Bioengineering, Politecnico di Milano, 4Department of Chemical and Materials Engineering, University of Alberta, 5National Institute for Nanotechnology, National Research Council (Canada), 6Department of Chemical and Biochemical Engineering, University of Western Ontario

JoVE 52812


 Bioengineering

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

1Department of Offshore, Process and Energy Engineering, Cranfield University, 2School of Applied Chemical and Environmental Sciences, Sheridan College Institute of Technology and Advanced Learning, 3School of Engineering, University of Guelph, 4Carbon Systems Engineering, Centre for Combustion, Carbon Capture and Storage, Cranfield University

JoVE 55062


 Engineering

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


 Environment

Extraction and Analysis of Microbial Phospholipid Fatty Acids in Soils

1Department of Renewable Resources, University of Alberta, 2Department of Science, Augustana Faculty, University of Alberta, 3Laboratoire Génie Civil et géo-Environnement, Université de Lille, 4Department of Earth and Environmental Sciences, Mount Royal University, 5Forest Ecology & Production, Great Lakes Forestry Centre, Natural Resources Canada

JoVE 54360


 Environment

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

1Division of Pulmonary Medicine, University of Alberta, 2Faculty of Physical Education and Recreation, University of Alberta, 3Divisions of Critical Care and Cardiology, University of Alberta, 4Faculty of Rehabilitation Medicine, University of Alberta, 5G.F. MacDonald Centre for Lung Health

JoVE 54949


 Medicine

12345678960
More Results...