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Botulinum Toxins: Toxic proteins produced from the species Clostridium botulinum. The toxins are synthesized as a single peptide chain which is processed into a mature protein consisting of a heavy chain and light chain joined via a disulfide bond. The botulinum toxin light chain is a zinc-dependent protease which is released from the heavy chain upon Endocytosis into Presynaptic nerve endings. Once inside the cell the botulinum toxin light chain cleaves specific Snare proteins which are essential for secretion of Acetylcholine by Synaptic vesicles. This inhibition of acetylcholine release results in muscular Paralysis.

Ultrasound-guided Botulinum Toxin-A Injections: A Method of Treating Sialorrhea

1Clinical and Biological Sciences Department, Neurology Unit, University of Torino, San Luigi Gonzaga Hospital, 2Oncology Department, Radiology Unit, University of Torino, San Luigi Gonzaga Hospital, 3Clinical and Biological Sciences Department, Dietologic and Nutrition Unit, University of Torino, San Luigi Gonzaga Hospital

JoVE 54606


 Medicine

A High Content Imaging Assay for Identification of Botulinum Neurotoxin Inhibitors

1Perkin Elmer Inc., 2Henry M. Jackson Foundation, 3The Geneva Foundation, 4ORISE, 5Frederick National Laboratory for Cancer Research, 6Division of Molecular and Translational Sciences, US Army Medical Research Institute of Infectious Diseases, 7DoD Biotechnology High Performance Computing Software Applications Institute (BHSAI), Telemedicine and Advanced Technology Research Center (TATRC), US Army Medical Research and Materiel Command (USAMRMC)

JoVE 51915


 Neuroscience

The Use of a β-lactamase - Based Conductimetric Biosensor Assay to Detect Biomolecular Interactions

1Life Science Department, University of Liège, 2Institute of Condensed Matter and Nanoscience, Catholic University of Louvain, 3Laboratory of Clinical Microbiology, Catholic University of Louvain, 4Biotechnology Department, CER Group

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JoVE 55414


 JoVE In-Press

Solutions and Concentrations

JoVE 10078

Source: Laboratory of Dr. Michael Evans — Georgia Institute of Technology

A solution is a homogeneous mixture containing some components in small amounts, called solutes, and one component in a large amount, called the solvent. Solid-liquid solutions contain one or more solid solutes dissolved in a liquid solvent. Solutions are ubiquitous in chemistry: they are used to store and handle small amounts of material, carry out chemical reactions, and develop materials with controllable properties. The density of a solute in a solution is known as the concentration of the solute. Concentration can be expressed in several ways, differing in the units used to convey the amounts of solute, solvent, and solution. This demonstration illustrates how to prepare a sucrose solution with a target concentration using precise analytical techniques. Additionally, various measures of the concentration of this solution are presented and explained.


 General Chemistry

IgY Technology: Extraction of Chicken Antibodies from Egg Yolk by Polyethylene Glycol (PEG) Precipitation

1Center for Biological Security, Robert Koch-Institute, 2CICVyA - INTA Castelar, Instituto de Virología, 3Center of Molecular Immunology, Ciudad de la Habana, Cuba, 4Department of Biology, Chemistry, Pharmacy, Institute of Biology-Neurobiology, Free University of Berlin, 5Institut of Pharmacology, Charité-University Medicine of Berlin

JoVE 3084


 Immunology and Infection

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SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

1Department of Cellular and Molecular Physiology, Yale University School of Medicine, 2Nanobiology Institute, Yale University, 3Department of Molecular Biophysics and Biochemistry, Yale University, 4Laboratoire de Neurophotonique, Université Paris Descartes, Faculté des Sciences Fondamentales et Biomédicales, Centre National de la Recherche Scientifique (CNRS)

JoVE 54349


 Neuroscience

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Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 1. Biosafety Level 4 Suit Laboratory Suite Entry and Exit Procedures

1Integrated Research Facility at Frederick, National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), 2Environmental Health and Safety, Biological and Chemical Safety Program, University of Texas Medical Branch

JoVE 52317


 Immunology and Infection

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Initial Evaluation of Antibody-conjugates Modified with Viral-derived Peptides for Increasing Cellular Accumulation and Improving Tumor Targeting

1Department of Nuclear Medicine and Radiobiology, Université de Sherbrooke, 2Sherbrooke Molecular Imaging Center (CIMS), Université de Sherbrooke, 3Sherbrooke Institute of Pharmacology

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JoVE 55440


 JoVE In-Press

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Personalized Needles for Microinjections in the Rodent Brain

1Department of Medical Sciences, Section of Pharmacology, and National Institute of Neurosciences, University of Ferrara, 2Laboratory for the Technologies for Advanced Therapies (LTTA), University of Ferrara

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JoVE 55751


 JoVE In-Press

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