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Acridine Orange: A cationic cytochemical stain specific for cell nuclei, especially DNA. It is used as a supravital stain and in fluorescence cytochemistry. It may cause mutations in microorganisms.

Fluorescent Dye Labeling of Erythrocytes and Leukocytes for Studying the Flow Dynamics in Mouse Retinal Circulation

1National Healthcare Group Eye Institute, Tan Tock Seng Hospital, 2Singapore Eye Research Institute (SERI), Singapore National Eye Center, 3School of Material Science and Engineering, Nanyang Technological University, 4Department of Ophthalmology, Yong Loo Lin School of Medicine, National University Health Systems, National University of Singapore, 5Ophthalmology Academic Clinical Research Program, DUKE-NUS Graduate Medical School

JoVE 55495


 Medicine

Rapid Acquisition of 3D Images Using High-resolution Episcopic Microscopy

1Department of Pediatric Surgery, The Second Affiliated Hospital & Yuying Children's Hospital, Wenzhou Medical University, 2Departments of Urology, Boston Children's Hospital, 3Department of Surgery, Harvard Medical School, 4Department of Cardiovascular Surgery, Guangdong Cardiovascular Institute, Guangdong General Hospital, Guangdong Academy of Medical Sciences

JoVE 54625


 Developmental Biology

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

1Electrical Engineering Department, University of Washington, 2Division of Human Biology, Fred Hutchinson Cancer Research Center, 3Molecular and Cellular Biology Program, University of Washington, 4Clinical Research, Fred Hutchinson Cancer Research Center, 5Public Health Sciences, Fred Hutchinson Cancer Research Center

JoVE 3390


 Bioengineering

Accurate and Simple Measurement of the Pro-inflammatory Cytokine IL-1β using a Whole Blood Stimulation Assay

1Translational Immunology Section, Office of Science and Technology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, 2Translational Autoinflammatory Disease Section, Office of the Clinical Director, National Institute of Arthritis and Musculoskeletal and Skin Diseases

JoVE 2662


 Medicine

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Large-Scale Purification of Porcine or Bovine Photoreceptor Outer Segments for Phagocytosis Assays on Retinal Pigment Epithelial Cells

1INSERM, U968, 2Sorbonne Universités, UPMC Paris 06, UMR_S 968, Institut de la Vision, 3CNRS, UMR_7210, 4Department of Biological Sciences, Center for Cancer, Genetic Diseases and Gene Regulation, Fordham University

JoVE 52100


 Immunology and Infection

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Le Châtelier's Principle

JoVE 10138

Source: Laboratory of Dr. Lynne O'Connell — Boston College

When the conditions of a system at equilibrium are altered, the system responds in such a way as to maintain the equilibrium. In 1888, Henri-Lewis Le Châtelier described this phenomenon in a principle that states, "When a change in temperature, pressure, or concentration disturbs a system in chemical equilibrium, the change will be counteracted by an alteration in the equilibrium composition." This experiment demonstrates Le Châtelier's principle at work in a reversible reaction between iron(III) ion and thiocyanate ion, which produces iron(III) thiocyante ion: Fe3+(aq) + SCN- (aq) FeSCN2+ (aq) The concentration of one of the ions is altered either by directly adding a quantity of one ion to the solution or by selectively removing an ion from the solution through formation of an insoluble salt. Observations of color changes indicate whether the equilibrium has shifted to favor formation of the products or the reactants. In addition, the effect of a temperature change on the solution at equilibrium can be obs


 Essentials of General Chemistry

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The Other End of the Leash: An Experimental Test to Analyze How Owners Interact with Their Pet Dogs

1Comparative Cognition, Messerli Research Institute, University of Veterinary Medicine of Vienna, Medical University of Vienna, University of Vienna, 2Wolf Science Center, Messerli Research Institute, University of Veterinary Medicine of Vienna, Medical University of Vienna, University of Vienna, 3Department of Cognitive Biology, University of Vienna, 4Research Centre for Natural Sciences, Institute of Cognitive Neuroscience and Psychology, Hungarian Academy of Sciences

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JoVE 56233


 JoVE In-Press

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Identifying DNA Mutations in Purified Hematopoietic Stem/Progenitor Cells

1Greehey Children's Cancer Research Institute, UT Health Science Center at San Antonio, 2Department of Cellular and Structural Biology, UT Health Science Center at San Antonio, 3Department of Pathology, UT Health Science Center at San Antonio, 4Department of Microbiology, UT Health Science Center at San Antonio, 5Cancer Therapy and Research Center, UT Health Science Center at San Antonio

JoVE 50752


 Immunology and Infection

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Synthesis and Characterization of Fe-doped Aluminosilicate Nanotubes with Enhanced Electron Conductive Properties

1Department of Applied Science and Technology, Politecnico di Torino, 2Department of Civil and Mechanical Engineering, Università degli Studi di Cassino e del Lazio Meridionale, 3Institute of Chemistry, Politecnico di Torino, 4Department of Chemistry & NIS Interdepartmental Centre, University of Turin, 5INSTM Unit of Torino-Politecnico, Politecnico di Torino

JoVE 54758


 Chemistry

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Enhanced Reduced Representation Bisulfite Sequencing for Assessment of DNA Methylation at Base Pair Resolution

1Department of Medicine, Weill Cornell Medical College, 2Institute for Computational Biomedicine, Weill Cornell Medical College, 3Department of Physiology and Biophysics, Weill Cornell Medical College, 4Department of Pathology, University of Michigan

JoVE 52246


 Biology

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Using X-ray Crystallography, Biophysics, and Functional Assays to Determine the Mechanisms Governing T-cell Receptor Recognition of Cancer Antigens

1Division of Infection and Immunity and Systems Immunity Research Institute, Cardiff University, 2Department of Oncology, University Hospital of Lausanne (CHUV), 3Ludwig Insitutue for Cancer Research, Lausanne Branch, University of Lausanne

JoVE 54991


 Immunology and Infection

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