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Organisms, Genetically Modified: Organisms whose Genome has been changed by a Genetic engineering technique.
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A Genetically Engineered Mouse Model of Sporadic Colorectal Cancer

1Department of Gastrointestinal, Thoracic and Vascular Surgery, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, 2Department of General, Gastrointestinal and Transplant Surgery, University of Heidelberg, 3Department of Pathology, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, 4German Cancer Consortium (DKTK), 5German Cancer Research Center (DKFZ)

JoVE 55952


 Cancer Research

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Evaluation of Vascular Control Mechanisms Utilizing Video Microscopy of Isolated Resistance Arteries of Rats

1Department of Physical Therapy, Marquette University, 2Medical College of Wisconsin, 3Department of Physiology, Medical College of Wisconsin, 4Graduate Programs of Nurse Anesthesia, Texas Wesleyan University, 5Office of Research, MCW, Medical College of Wisconsin

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JoVE 56133


 JoVE In-Press

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Contextual and Cued Fear Conditioning Test Using a Video Analyzing System in Mice

1Division of Systems Medical Science, Institute for Comprehensive Medical Science, Fujita Health University, 2Japan Science and Technology Agency, Core Research for Evolutionary Science and Technology (CREST), 3Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, National Institutes of Natural Sciences

JoVE 50871


 Behavior

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RNA Analysis of Environmental Samples Using RT-PCR

JoVE 10104

Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - Arizona University
Demonstrating Author: Bradley Schmitz

Reverse transcription-polymerase chain reaction (RT-PCR) involves the same process as conventional PCR — cycling temperature to amplify nucleic acids. However, while conventional PCR only amplifies deoxyribonucleic acids (DNA), RT-PCR enables the amplification of ribonucleic acids (RNA) through the formation of complementary DNA (cDNA). This enables RNA-based organisms found within the environment to be analyzed utilizing methods and technologies that are designed for DNA. Many viruses found in the environment use RNA as their genetic material. Several RNA-based viral pathogens, such as Norovirus, and indicator organisms, such as pepper mild mottle virus (PMMoV), do not have culture-based detection methods for quantification. In order to detect for the presence of these RNA viruses in environmental samples from soil, water, agriculture, etc., molecular assays rely on RT-PCR to convert RNA into DNA. Without RT-PCR, microbiologists would not be able to assay and research numerous RNA-based viruses that pose risks to human and environmental health. RT-PCR can also be employed as a tool to measure microbial activity in the env


 Environmental Microbiology

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Assessment of DNA Contamination in RNA Samples Based on Ribosomal DNA

1Genetics and Agricultural Biotechnology Institute of Tabarestan (GABIT), Sari Agricultural Sciences and Natural Resources University (SANRU), 2Department of Industrial and Environmental Biotechnology, National Institute of Genetics Engineering and Biotechnology (NIGEB), 3Department of Plant Breeding and Biotechnology, Gorgan University of Agricultural Sciences & Natural Resources, 4RG Abiotic Stress Genomics/ RG Heterosis, Department Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK)

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JoVE 55451


 JoVE In-Press

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Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity

1Department of Biomedical and Molecular Sciences, Queen's University, 2National Institute of Neurological Disorders and Stroke, Porter Neuroscience Research Center, 3Research Institute of Genome-Based Biofactory, National Institute of Advanced Industrial Science and Technology, 4The Robert H. Smith Faculty of Agriculture, Food and Environment, Institute of Biochemistry, Food Science, and Nutrition, The Hebrew University of Jerusalem

JoVE 51185


 Chemistry

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Imaging Subcellular Structures in the Living Zebrafish Embryo

1Institute of Neuronal Cell Biology, Technische Universität München, 2Cell Biology, Department of Biology, Faculty of Science, Utrecht University, 3Faculty of Biology, Ludwig-Maximilians-Universität-München, 4Adolf-Butenandt-Institute, Biochemistry, Ludwig-Maximilians-Universität-München, 5German Center for Neurodegenerative Diseases, 6Laboratory of Brain Development and Repair, The Rockefeller University

JoVE 53456


 Developmental Biology

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Measuring Spatial and Temporal Ca2+ Signals in Arabidopsis Plants

1Department of Horticulture and Landscape Architecture, Purdue University, 2Bindley Bioscience Center, Purdue University, 3Institute of Biotechnology, Jiangsu Academy of Agricultural Sciences, 4College of Environmental & Resource Science, Zhejiang University, 5Dryland Agriculture Research Centre, Shanxi Academy of Agricultural Sciences, 6Shanghai Center for Plant Stress Biology, Chinese Academy of Sciences

JoVE 51945


 Biology

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Mass Production of Genetically Modified Aedes aegypti for Field Releases in Brazil

1Oxitec Ltd, 2Departamento de Parasitologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, 3Departamento de Epidemiologia, Universidade de São Paulo, 4Moscamed Brasil, 5Deptartment of Zoology, University of Oxford, 6Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular (INCT-EM)

JoVE 3579


 Environment

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Dissolved Oxygen in Surface Water

JoVE 10016

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

Dissolved oxygen (DO) measurements calculate the amount of gaseous oxygen dissolved in surface water, which is important to all oxygen-breathing life in river ecosystems, including fish species preferred for human consumption (e.g. bluegill and bass), as well as decomposer species critical to the recycling of biogeochemical materials in the system. The oxygen dissolved in lakes, rivers, and oceans is crucial for the organisms and creatures living in it. As the amount of dissolved oxygen drops below normal levels in water bodies, the water quality is harmed and creatures begin to die. In a process called eutrophication, a body of water can become hypoxic and will no longer be able to support living organisms, essentially becoming a “dead zone.” Eutrophication occurs when excess nutrients cause algae populations to grow rapidly in an algal bloom. The algal bloom forms dense mats at the surface of the water blocking out two essential inputs of oxygen for water: gas exchange from the atmosphere and photosynthesis in the water due to the lack of light below the mats. As dissolved oxygen levels decline below the surface, oxygen-breathing organisms die-off in large amounts, creati


 Environmental Science

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Modified Roller Tube Method for Precisely Localized and Repetitive Intermittent Imaging During Long-term Culture of Brain Slices in an Enclosed System

1Department of Biochemistry and Molecular Biology and Molecular, Cellular and Integrated Neuroscience Program, Colorado State University

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JoVE 56436


 JoVE In-Press

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Human Placental and Decidual Organ Cultures to Study Infections at the Maternal-fetal Interface

1Benioff Children’s Hospital, 2Department of Pathology, University of California, San Francisco, 3Center for Reproductive Sciences and Department of Obstetrics, University of California, San Francisco, 4Program in Microbial Pathogenesis and Host Defense, University of California, San Francisco, 5Biomedical Sciences Program, University of California, San Francisco

JoVE 54237


 Immunology and Infection

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