The Journal of Visualized Experiments (JoVE) is a peer reviewed, PubMed-indexed video journal. Our mission is to increase the productivity of scientific research.

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Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency


JoVE 2953 6/16/2011

Viral Populations and Pathogenesis lab and CNRS 3015, Institut Pasteur

The present article describes the steps required to isolate and characterize RNA polymerase fidelity variants of RNA viruses and how to use mutation frequency data to confirm fidelity changes in tissue culture.

 

Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique


JoVE 3255 10/27/2011

1Department of Molecular Oncology, Weatherall Institute of Molecular Medicine, University of Oxford , 2Institute of Genetics and Biotechnology, Faculty of Biology, University of Warsaw

DT40, a model vertebrate genetic system, provides a powerful tool to analyze protein function. Here we describe a simple method that allows qualitative analysis of parameters that influence DNA synthesis during the S-phase in DT40 cells at the single molecule level.

 

Visualizing Single-molecule DNA Replication with Fluorescence Microscopy


JoVE 1529 10/09/2009

Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School

This protocol demonstrates a simple single-molecule fluorescence microscopy technique for visualizing DNA replication by individual replisomes in real time.

 

Basics of Multivariate Analysis in Neuroimaging Data


JoVE 1988 7/24/2010

Department of Neurology, Columbia University

The current article describes the basics of multivariate analysis and contrasts it to the more commonly used voxel-wise univariate analysis. Both types of analysis are applied to a clinical-neuroscience data set. Supplementary split-half simulations show better replication of the multivariate results in independent data sets.

 

Ex Vivo Infection of Live Tissue with Oncolytic Viruses


JoVE 2854 6/25/2011

Center for Innovative Cancer Research, Ottawa Hospital Research Institute (OHRI)

Oncolytic viruses are promising for cancer therapeutics. The ability to ascertain the infectability of live tissue specimens obtained from patients prior to treatment is a unique advantage of this therapeutic approach. This protocol describes how to process tissues for ex vivo infection with oncolytic virus and subsequent viral quantification.

 

Determining the Phagocytic Activity of Clinical Antibody Samples


JoVE 3588 11/30/2011

1Massachusetts General Hospital, Ragon Institute of MGH, MIT, and Harvard, 2Thayer School of Engineering, Dartmouth College

We present a high-throughput flow cytometric assay to determine the phagocytic activity of antigen-specific antibodies from clinical samples, utilizing fluorescent antigen-coated beads and a monocytic cell line expressing multiple Fc receptors—providing receptor usage and phagocytic activity determinations in a standardized and reproducible fashion for any antigen of interest.

 

Visualizing Cell-to-cell Transfer of HIV using Fluorescent Clones of HIV and Live Confocal Microscopy


JoVE 2061 10/07/2010

1Division of Infectious Diseases, Department of Medicine, Immunology Institute, Mount Sinai School of Medicine , 2NSF Center for Biophotonics, University of California, Davis, 3Structural and Computational Biology Unit, European Molecular Biology Laboratory

This visualized experiment is a guide for utilizing a fluorescent molecular clone of HIV for live confocal imaging experiments.

 

Methods Development for Blood Borne Macrophage Carriage of Nanoformulated Antiretroviral Drugs


JoVE 2460 12/09/2010

Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center

Nanoparticles of indinavir, ritonavir, efavirenz and atazanavir were manufactured using wet milling, homogenization and ultrasonication. These nanoformulations, collectively termed nanoformulated antiretroviral therapy (nanoART), assessed macrophage-based drug delivery. Monocyte-derived macrophage nanoART uptake, retention and sustained release were determined. These preliminary studies suggest the potential of nanoART for clinical use.

 

Measurement of γHV68 Infection in Mice


JoVE 3472 11/22/2011

Department of Molecular Microbiology and Immunology, University of Southern California, Los Angeles

γ-Herpesviruses (γ-HVs) establish life-long persistency in their host. Infection of mice with γ-HV68 provides a genetically tractable in vivo model for the characterization of the lifecycle/pathogenesis of γHVs. This protocol describes the detection and quantitation of γHV68 infection at acute and latent stages following infection by plaque-forming, infectious center, and qPCR assays.

 

A Microfluidic Device for Quantifying Bacterial Chemotaxis in Stable Concentration Gradients


JoVE 1779 4/19/2010

1McFerrin Department of Chemical Engineering, Texas A&M University, 2Department of Biology, Texas A&M University, 3Department of Biomedical Engineering, Texas A&M University

This protocol describes the development of a microfluidic device for investigating bacterial chemotaxis in stable concentration gradients of chemoeffectors.

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