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JoVE Biology
 JoVE Biology

Aip1p Dynamics Are Altered by the R256H Mutation in Actin

1Department of Pediatrics, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, 2Department of Biochemistry, Roy J. and Lucille A. Carver College of Medicine, University of Iowa


JoVE 51551

Disease-causing mutations in actin can alter cytoskeletal function. Cytoskeletal dynamics are quantified through imaging of fluorescently tagged proteins using total internal fluorescence microscopy. As an example, the cytoskeletal protein, Aip1p, has altered localization and movement in cells expressing the mutant actin isoform, R256H.

 JoVE Biology

High Throughput Quantitative Expression Screening and Purification Applied to Recombinant Disulfide-rich Venom Proteins Produced in E. coli

1Architecture et Fonction des Macromolécules Biologiques (AFMB), Aix-Marseille Université, 2iBiTec-S, Service d'Ingénierie Moléculaire des Protéines (SIMOPRO), Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Saclay, France


JoVE 51464

A protocol for the quantitative, high throughput expression screening and analytical purification of fusion proteins from small-scale Escherichia coli cultures is described and applied to the expression of disulfide-rich animal venom protein targets.

 JoVE Biology

Characterization of G Protein-coupled Receptors by a Fluorescence-based Calcium Mobilization Assay

1Department of Biology, KU Leuven


JoVE 51516

The here described fluorescence-based calcium mobilization assay is a medium-throughput reverse pharmacology screening system for the identification of functionally activating ligand(s) of orphan G protein-coupled receptors (GPCRs).

 JoVE Biology

Cryo-electron Microscopy Specimen Preparation By Means Of a Focused Ion Beam

1Department of Engineering Sciences, Uppsala University, 2Gatan Inc., 3Department of Microbiology, Swedish University of Agricultural Sciences, 4Physics Department, University of Oslo


JoVE 51463

Cryo Electron Microscopes, either Scanning (SEM) or Transmission (TEM), are widely used for characterization of biological samples or other materials with a high water content1. A SEM/Focused Ion Beam (FIB) is used to identify features of interest in samples and extract a thin, electron-transparent lamella for transfer to a cryo-TEM.

 JoVE Biology

Reconstruction of 3-Dimensional Histology Volume and its Application to Study Mouse Mammary Glands

1Department of Medical Biophysics, University of Toronto, 2Platform Biological Sciences, Sunnybrook Research Institute, 3Department of Laboratory Medicine and Pathobiology, University of Toronto, 4Physical Sciences, Sunnybrook Research Institute, 5Department of Pathology and Laboratory Medicine, Medical University of South Carolina, 6Manitoba Institute of Cell Biology, University of Manitoba


JoVE 51325

We present an image registration approach for 3-dimensional (3D) histology volume reconstruction, which facilitates the study of the changes of an organ at the level of macrostructures made up of cells . Using this approach, we studied the 3D changes between wild-type and Igfbp7-null mammary glands.

 JoVE Biology

AFM-based Mapping of the Elastic Properties of Cell Walls: at Tissue, Cellular, and Subcellular Resolutions

1Laboratoire Matière et Systèmes Complexes, UFR de Physique, Université Paris Diderot, 2Institut Jean-Pierre Bourgin, UMR1318 INRA-AgroParisTech, INRA Centre de Versailles-Grignon


JoVE 51317

We describe a method to map mechanical properties of plant tissues using an atomic force microscope (AFM). We focus on how to record mechanical changes that take place in cell walls during plant development at wide-field mesoscale, enabling these changes to be correlated with growth and morphogenesis.

 JoVE Biology

Generation of Dispersed Presomitic Mesoderm Cell Cultures for Imaging of the Zebrafish Segmentation Clock in Single Cells

1Max Planck Institute of Molecular Cell Biology and Genetics


JoVE 50307

Somitogenesis is a rhythmic developmental process that spatially patterns the body axis of vertebrate embryos. Previously, we developed transgenic zebrafish lines that use fluorescent reporters to observe the cyclic genes that drive this process. Here, we culture dispersed cells from these lines and image their oscillations over time in vitro.

 JoVE Biology

SIVQ-LCM Protocol for the ArcturusXT Instrument

1Laboratory of Pathology, National Cancer Institute, National Institutes of Health, 2Department of Pathology, University of Michigan


JoVE 51662

SIVQ-LCM is an innovative approach that harnesses a computer algorithm, Spatially Invariant Vector Quantization (SIVQ), to drive the laser capture microdissection (LCM) process. The SIVQ-LCM workflow greatly improves the speed and accuracy of microdissection, with applications in both the research and clinical settings.

 JoVE Biology

RNA Catalyst as a Reporter for Screening Drugs against RNA Editing in Trypanosomes

1Department of Biochemistry, McGill University, 2Institute of Parasitology, McGill University, 3McGill Centre for Bioinformatics, McGill University


JoVE 51712

A highly sensitive ribozyme-based assay, applicable to high-throughput screening of chemicals targeting the unique process of RNA editing in trypanosomatid pathogens, is described in this paper. Inhibitors can be used as tools for hypothesis-driven analysis of the RNA editing process and ultimately as therapeutics.

 JoVE Biology

DNA-affinity-purified Chip (DAP-chip) Method to Determine Gene Targets for Bacterial Two component Regulatory Systems

1Physical Biosciences Division, Lawrence Berkeley National Laboratory


JoVE 51715

This video article describes an in vitro microarray based method to determine the gene targets and binding sites for two component system response regulators.

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