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Factor IX: Storage-stable blood coagulation factor acting in the intrinsic pathway. Its activated form, IXa, forms a complex with factor Viii and calcium on platelet factor 3 to activate factor X to Xa. Deficiency of factor Ix results in Hemophilia b (Christmas Disease).
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 JoVE In-Press

Optimized Protocol for the Extraction of Proteins from the Human Mitral Valve

1Centro Cardiologico Monzino IRCCS, 2Cardiovascular Tissue Bank of Milan, Centro Cardiologico Monzino IRCCS, 3Department of Clinical Sciences and Community Health, Cardiovascular Section, University of Milan, 4Department of Cardiovascular Disease, Development and Innovation Cardiac Surgery Unit, IRCCS Centro Cardiologico Monzino

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JoVE 55762

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 JoVE Bioengineering

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

1Jülich Centre for Neutron Science Outstation at MLZ, Forschungszentrum Jülich GmbH, 2Department of Chemistry, Louisiana State University, 3Jülich Centre for Neutron Science JCNS-1 & Institute of Complex Systems ICS-1, Forschungszentrum Jülich GmbH, 4Central Institute of Engineering, Electronics and Analytics — Electronic Systems (ZEA-2), Forschungszentrum Jülich GmbH, 5Central Institute of Engineering, Electronics and Analytics — Engineering and Technology (ZEA-1), Forschungszentrum Jülich GmbH


JoVE 54639

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 JoVE Bioengineering

Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome

1Division of Hematology, Davidoff Cancer Center, Rabin Medical Center, 2The Center of Nanoscience and Nanotechnology, Tel Aviv University, 3Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, 4Department of Leukemia, The University of Texas MD Anderson Cancer Center


JoVE 53300

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 JoVE Bioengineering

Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery

1Department of Orthopaedic Surgery, Yong Loo Lin School of Medicine, National University of Singapore, 2Centre for Research in Medical Devices (CÚRAM), National University of Ireland Galway, 3Department of Bioengineering, Faculty of Engineering, National University of Singapore, 4Tissue Engineering Program, National University of Singapore, 5Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center, University of California, Los Angeles


JoVE 54202

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 JoVE Medicine

Isolation of Endothelial Progenitor Cells from Healthy Volunteers and Their Migratory Potential Influenced by Serum Samples After Cardiac Surgery

1Department of Intensive Care Medicine, University Hospital Aachen, 2Institute of Biochemistry and Molecular Biology, University Hospital Aachen, 3Department of Radiology, German Cancer Research Center, 4Department of Thoracic and Cardiovascular Surgery, University Hospital Aachen, 5Department of Vascular Biology, Institute for Stroke and Dementia Research (ISD), Klinikum der Universität München, 6Deutsches Zentrum für Herz-/Kreislaufkrankheiten (DZHK), Munich Heart Alliance


JoVE 55192

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 JoVE Neuroscience

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

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 JoVE Biology

High Efficiency Differentiation of Human Pluripotent Stem Cells to Cardiomyocytes and Characterization by Flow Cytometry

1Department of Biochemistry, Medical College of Wisconsin, 2Stanford Cardiovascular Institute, Stanford University School of Medicine, 3Department of Anesthesiology, Medical College of Wisconsin, 4Stem Cell and Regenerative Medicine Consortium, LKS Faculty of Medicine, Hong Kong University, 5Division of Cardiology, Johns Hopkins University School of Medicine, 6Cardiovascular Research Center, Biotechnology and Bioengineering Center, Medical College of Wisconsin


JoVE 52010

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 JoVE Bioengineering

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

1Transfusion Research Center, Belgian Red Cross-Flanders, 2Faculty of Medicine and Health Sciences, Ghent University, 3Blood Service, Belgian Red Cross-Flanders, 4Department of Public Health and Primary Care, KULeuven - University of Leuven


JoVE 55351

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 JoVE Immunology and Infection

A Simple and Efficient Method to Detect Nuclear Factor Activation in Human Neutrophils by Flow Cytometry

1Department of Biological Sciences, University of Alberta, 2División de Estudios de Posgrado e Investigación, Facultad de Odontología, Universidad Nacional Autónoma de México, 3Department of Immunology, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México


JoVE 50410

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 JoVE Medicine

Quantification of the Immunosuppressant Tacrolimus on Dried Blood Spots Using LC-MS/MS

1iC42 Clinical Research and Development, University of Colorado, Anschutz Medical Campus, 2Division of Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, 3Food and Drug Administration (FDA), Center of Drug Evaluation Research - Office of Generic Drugs, 4Transplant Clinical Research, University of Cincinnati


JoVE 52424

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 JoVE In-Press

Assessing Working Memory in Children: The Comprehensive Assessment Battery for Children - Working Memory (CABC-WM)

1Communication Sciences and Disorders, MGH Institute of Health Professions, 2Speech and Hearing Science, Arizona State University, 3Speech, Language, and Hearing Sciences, University of Arizona, 4Department of Psychological Sciences, University of Missouri-Columbia, 5Sanford School of Social and Family Dynamics, Arizona State University, 6School of Osteopathic Medicine in Arizona

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JoVE 55121

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 JoVE In-Press

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway During Cell Differentiation and Xenopus Embryonic Development

1Department of Biochemistry, University of Illinois at Urbana-Champaign, 2Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, 3Neuroscience Program, University of Illinois at Urbana-Champaign, 4Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign

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JoVE 55823

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 Science Education: Essentials of Analytical Chemistry

Internal Standards

JoVE Science Education

Source: Laboratory of Dr. B. Jill Venton - University of Virginia

The goal of many chemical analyses is a quantitative analysis, where the amount of a substance in a sample is determined. In order to accurately calculate the concentration of an unknown from a sample, careful sample preparation is key. Every time a sample is handled or transferred, some of the sample can be lost. There are strategies however, for minimizing sample loss. There are also strategies for coping with sample loss and still making accurate measurements of concentration. To minimize sample loss, the ideal is to minimize the number of sample handling and transfer steps. For example, massing a solid sample directly into a flask that a solution will be made in reduces a transfer step. If it's necessary to transfer from one flask to another and a dilution is being made, then triple rinsing the glassware helps ensure all the sample is transferred. Other strategies are more specific to the sample. For example, samples that adsorb to glass, such as proteins, might better be handled in polypropylene disposable tubes. The tubes are not hydrophilic, so if a small amount of sample is to be pipetted in water, it is best to have already added the water to the tube, so the sample can be pipetted directly into the solve

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 JoVE Developmental Biology

Direct Induction of Human Neural Stem Cells from Peripheral Blood Hematopoietic Progenitor Cells

1Translational Neuroscience Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, 2Laboratory of Molecular Medicine and Neuroscience, National Institute of Neurological Disorders and Stroke, National Institutes of Health


JoVE 52298

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 JoVE Developmental Biology

Generation of Integration-free Induced Pluripotent Stem Cells from Human Peripheral Blood Mononuclear Cells Using Episomal Vectors

1State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Disease Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 2Division of Regenerative Medicine, Department of Medicine, Loma Linda University, 3Department of Orthopaedic Surgery, Loma Linda University, 4Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, 5Department of Stem Cell & Regenerative Medicine, Peking Union Medical College, 6Collaborative Innovation Center for Cancer Medicine, 7Tianjin Key Laboratory of Blood Cell Therapy and Technology


JoVE 55091

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 JoVE In-Press

High Precision FRET at Single-molecule Level for Biomolecule Structure Determination

1Department of Chemistry, Clemson University, 2Department of Physics and Astronomy, Clemson University, 3Department of Biochemistry and Molecular Biology, Center for Membrane Biology, University of Texas Health Science Center, Graduate School for Biomedical Sciences

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JoVE 55623

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 JoVE In-Press

Chondrogenic Pellet Formation from Cord Blood-derived Induced Pluripotent Stem Cells

1CiSTEM Laboratory, Convergent Research Consortium for Immunologic Disease, Division of Rheumatology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 2Division of Rheumatology, Department of Internal Medicine, Seoul St. Mary's Hospital, Institute of Medical Science, College of Medicine, The Catholic University of Korea

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JoVE 55988

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