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JoVE Biology
 JoVE Biology

Next-generation Sequencing of 16S Ribosomal RNA Gene Amplicons

1Energy, Mining and Environment, National Research Council Canada


JoVE 51709

Characterizing microbial community has been a longstanding goal in environmental microbiology. Next-generation sequencing methods now allow for the characterization of microbial communities at an unprecedented depth with minimal cost and labor. We detail here our approach to sequence bacterial 16S ribosomal RNA genes using a benchtop sequencer.

 JoVE Biology

Assessing the Secretory Capacity of Pancreatic Acinar Cells

1Department of Molecular Genetics, Weizmann Institute of Science


JoVE 51799

Isolated pancreatic acini retain their in vivo morphology and activity and offer powerful ways for monitoring and manipulating secretion. This work demonstrates how acini can be isolated from the mouse pancreas, and how their secretory capacities can be assessed.

 JoVE Biology

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions

1LENS - European Laboratory for Non-linear Spectroscopy, University of Florence, 2Chemistry Research Laboratory, University of Oxford, 3Department of Biology, University of Florence, 4Department of Physics and Astronomy, University of Florence, 5National Institute of Optics-National Research Council, Italy, 6International Center of Computational Neurophotonics


JoVE 51446

Here we describe the instrumentation and methods for detecting single fluorescently-labeled protein molecules interacting with a single DNA molecule suspended between two optically trapped microspheres.

 JoVE Biology

Preparation of DNA-crosslinked Polyacrylamide Hydrogels

1New Jersey Neuroscience Institute, JFK Medical Center, 2Department of Biomedical Engineering, Rutgers University, 3Department of Mechanical and Aerospace Engineering, Rutgers University


JoVE 51323

Our laboratory has developed DNA-crosslinked polyacrylamide hydrogels, a dynamic hydrogel system, to better understand the effects of modulating tissue stiffness on cell function. Here, we provide schematics, descriptions, and protocols to prepare these hydrogels.

 JoVE Biology

In Vivo Microinjection and Electroporation of Mouse Testis

1Institute of Reproductive Biology, Leibniz Institute for Farm Animal Biology (FBN)


JoVE 51802

This article describes microinjection and electroporation of mouse testis in vivo as a transfection technique for testicular mouse cells to study unique processes of spermatogenesis. The presented protocol involves steps of glass capillary preparation, microinjection via the efferent duct, and transfection by electroporation.

 JoVE Biology

Zinc-finger Nuclease Enhanced Gene Targeting in Human Embryonic Stem Cells

1Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University


JoVE 51764

Reporter cell lines offer a means to visualize, track and isolate cells of interest from heterogeneous populations. However, gene-targeting using conventional homologous recombination in human embryonic stem cells is extremely inefficient. Herein, we describe targeting CNS midbrain specific transcription factor PITX3 locus with EGFP using zinc-finger nuclease enhanced homologous recombination.

 JoVE Biology

Isolation of Murine Valve Endothelial Cells

1Molecular, Cellular and Developmental Biology Graduate Program, The Ohio State University, 2Center for Cardiovascular and Pulmonary Research, The Heart Center, The Research Institute at Nationwide Children's Hospital, 3Department of Pediatrics, The Ohio State University


JoVE 51860

The ability to isolate heart valve endothelial cells (VECs) is critical for understanding mechanisms of valve development, maintenance, and disease. Here we describe the isolation of VECs from embryonic and adult Tie2-GFP mice using FACS that will allow for studies determining the contribution of VECs in developmental and disease processes.

 JoVE Biology

Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster

1Département de Génomique Fonctionnelle et Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire, 2Center for Life NanoScience, Istituto Italiano di Tecnologia


JoVE 51814

The aim of this publication is to visualize and discuss the operative steps of an Enhanced Northern Blot protocol on RNA extracted from Drosophila melanogaster embryos, cells, and tissues. This protocol is particularly useful for the efficient detection of small RNA species.

 JoVE Biology

Isolation of Blood-vessel-derived Multipotent Precursors from Human Skeletal Muscle

1Stem Cell Research Center, Department of Bioengineering and Orthopedic Surgery, University of Pittsburgh, 2Department of Orthopedic Surgery, University of Pittsburgh, 3Nazarbayev University Research and Innovation System, Nazarbayev University, 4Department of Orthopaedic Surgery, UCLA Orthopaedic Hospital and the Orthopaedic Hospital Research Center, University of California at Los Angeles, 5Department of Cell Biology, Erasmus MC Stem Cell Institute, 6OHSU Center for Regenerative Medicine, Oregon Health & Science University, 7Centre for Cardiovascular Science and MRC Centre for Regenerative Medicine, Queen's Medical Research Institute and University of Edinburgh, 8David Geffen School of Medicine and the Orthopaedic Hospital Research Center, University of California at Los Angeles, 9Stem Cell Research Center, Department of Orthopedic Surgery and McGowan Institute for Regenerative Medicine, University of Pittsburgh


JoVE 51195

Blood vessels within human skeletal muscle harbor several multi-lineage precursor populations that are ideal for regenerative applications. This isolation method allows simultaneous purification of three multipotent precursor cell populations respectively from three structural layers of blood vessels: myogenic endothelial cells from intima, pericytes from media, and adventitial cells from adventitia.

 JoVE Biology

Massively Parallel Reporter Assays in Cultured Mammalian Cells

1Broad Institute


JoVE 51719

The genetic reporter assay is a well-established and powerful tool for dissecting the relationship between DNA sequences and their gene regulatory activities. Coupling candidate regulatory elements to reporter genes that carry identifying sequence tags enables massive parallelization of these assays.

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