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Adherens Junctions: Anchoring points where the Cytoskeleton of neighboring cells are connected to each other. They are composed of specialized areas of the plasma membrane where bundles of the Actin cytoskeleton attach to the membrane through the transmembrane linkers, Cadherins, which in turn attach through their extracellular domains to cadherins in the neighboring cell membranes. In sheets of cells, they form into adhesion belts (zonula adherens) that go all the way around a cell.
 JoVE In-Press

The C. elegans Intestine as a Model for Inter-cellular Lumen Morphogenesis and in Vivo polarized Membrane Biogenesis at the Single-cell Level

1Mucosal Immunology and Biology Research Center, Developmental Biology and Genetics Core, Massachusetts General Hospital, Harvard Medical School, 2College of Life Sciences, Jilin University, 3Faculty of Health Sciences, University of Macau

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JoVE 56100

 JoVE In-Press

Improved Method for the Establishment of an In Vitro Blood-Brain Barrier Model Based on Porcine Brain Endothelial Cells

1Lundbeck Foundation Research Initiative on Brain Barriers and Drug Delivery, Department of Biomedicine, Aarhus University, 2Institute of Pharmaceutical Science, Franklin Wilkins Building, King's College London, 3HICoE Centre for Drug Research, Universiti Sains Malaysia

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JoVE 56277

 JoVE Developmental Biology

Stable and Efficient Genetic Modification of Cells in the Adult Mouse V-SVZ for the Analysis of Neural Stem Cell Autonomous and Non-autonomous Effects

1Cell Division and Cancer Group, Spanish National Cancer Research Centre (CNIO), 2Centro de Investigaciones Biomédicas en Red sobre Enfermedades Neurodegenerativas (CIBERNED), 3Departmento de Biologìa Celular, Universidad de Valencia, 4Institut de Biomedicina de la Universitat de Barcelona (IBUB), 5Department of Molecular and Translational Medicine, Fibroblast Reprogramming Unit, University of Brescia


JoVE 53282

 JoVE Medicine

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis

1Department of Molecular Biomedicine, Center for Research and Advanced Studies of the National Polytechnic Institute, 2Department of Physiology, Biophysics and Neurosciences, Center for Research and Advanced Studies of the National Polytechnic Institute, 3Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies of the National Polytechnic Institute


JoVE 55095

 JoVE Immunology and Infection

Analysis of the Epithelial Damage Produced by Entamoeba histolytica Infection

1Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies of the National Polytechnic Institute, 2Department of Molecular Biomedicine, Center for Research and Advanced Studies of the National Polytechnic Institute, 3Agency for Knowledge Commercialization, Center for Research and Advanced Studies of the National Polytechnic Institute


JoVE 51668

 JoVE Biochemistry

Brain Membrane Fractionation: An Ex Vivo Approach to Assess Subsynaptic Protein Localization

1Unitat de Farmacologia, Departament Patologia i Terapèutica Experimental, Facultat de Medicina, IDIBELL, Universitat de Barcelona, L'Hospitalet de Llobregat, 2Institut de Neurociències, Universitat de Barcelona, 3Center for Neurosciences of Coimbra, Institute of Biochemistry, Faculty of Medicine, University of Coimbra


JoVE 55661

 JoVE Neuroscience

High Resolution Quantitative Synaptic Proteome Profiling of Mouse Brain Regions After Auditory Discrimination Learning

1Leibniz Institute for Neurobiology (LIN), 2Institute of Experimental Internal Medicine, Medical School, Otto von Guericke University Magdeburg, 3Institute of Pharmacology and Toxicology, Medical School, Otto von Guericke University


JoVE 54992

 JoVE Developmental Biology

Imaging of Cell Shape Alteration and Cell Movement in Drosophila Gastrulation Using DE-cadherin Reporter Transgenic Flies

1Biotechnology and Genetic Engineering Department, Jahangirnagar University, 2JT Biohistory Research Hall, 3Division of Cell Regeneration and Transplantation, School of Medicine, Nihon University, 4Graduate School of Life and Medical Sciences, Doshisha University, 5Institute of Genetics and Animal Breeding of the Polish Academy of Sciences


JoVE 54764

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 JoVE Genetics

Bidirectional Retroviral Integration Site PCR Methodology and Quantitative Data Analysis Workflow

1UCLA AIDS Institute, University of California at Los Angeles (UCLA), 2Department of Microbiology, Immunology, & Molecular Genetics, University of California at Los Angeles (UCLA), 3Departments of Biomathematics and Mathematics, University of California at Los Angeles (UCLA), 4Personalized Genomic Medicine Research Center, Division of Strategic Research Groups, Korea Research Institute of Bioscience and Biotechnology, 5Department of Medicine, University of California at Los Angeles (UCLA), 6Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University (OSU)


JoVE 55812

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 JoVE Genetics

Retroviral Scanning: Mapping MLV Integration Sites to Define Cell-specific Regulatory Regions

1Center for Genome Research, Department of Life Sciences, University of Modena and Reggio Emilia, 2Laboratory of Chromatin and Gene Regulation During Development, Imagine Institute, 3Institute for Biomedical Technologies, CNR, 4Généthon, 5Sorbonne Paris Cité - Université Paris Descartes


JoVE 55919

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 JoVE In-Press

Experimental Approach for Determining Semiconductor/liquid Junction Energetics by Operando Ambient-Pressure X-ray Photoelectron Spectroscopy

1Division of Chemistry and Chemical Engineering, California Institute of Technology, 2Joint Center for Artificial Photosynthesis, California Institute of Technology, 3Advanced Light Source, Lawrence Berkeley National Laboratory, 4Beckman Institute, California Institute of Technology

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JoVE 54129

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 JoVE Immunology and Infection

Measurement of In Vitro Integration Activity of HIV-1 Preintegration Complexes

1Center for AIDS Health Disparities Research, Meharry Medical College, 2Department of Biochemistry and Cancer Biology, Meharry Medical College, 3School of Graduate Studies and Research, Meharry Medical College, 4Department of Microbiology and Immunology, Meharry Medical College, 5Tennessee Center for AIDS Research (TN-CFAR), Meharry Medical College


JoVE 54581

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 JoVE Biology

Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.

1Program in Gene Function and Expression, Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, 2Broad Institute of Harvard and Massachusetts Institute of Technology, 3Division of Health Sciences and Technology, Massachusetts Institute of Technology, 4Program for Evolutionary Dynamics, Department of Organismic and Evolutionary Biology, Department of Mathematics, Harvard University, 5Department of Applied Mathematics, Harvard University, 6Department of Physics, Massachusetts Institute of Technology, 7Department of Systems Biology, Harvard Medical School, 8Department of Biology, Massachusetts Institute of Technology


JoVE 1869

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 Science Education: Essentials of Physics II

Semiconductors

JoVE Science Education

Source: Derek Wilson, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA

Semiconductors are materials whose ability to conduct an electrical current depends strongly on their temperature and level of impurity. The most common type of semiconductor material is crystalline silicon. Most pure semiconductors are not outstanding conductors; to improve conductivity, a pure semiconductor is often combined or "doped" with an impurity. These impurities are either donors, like phosphorus and arsenic, that donate electrons to the silicon, or acceptors, like boron and aluminum, that steal electrons from the silicon. When acceptors take electrons from the silicon, they leave regions of positive charge called "holes" that effectively behave as positively charged electrons. A p-type semiconductor is formed when doping makes holes that are the dominant charge carrier in the material. An n-type semiconductor is formed when a semiconductor is doped such that the dominant charge carrier is the electron. As one might expect, a p-n junction is formed at the boundary between the p-type semiconductor and n-type semiconductor. The interaction of electrons and holes at the junction gives

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