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Mitotic Index: An expression of the number of mitoses found in a stated number of cells.
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T-maze Forced Alternation and Left-right Discrimination Tasks for Assessing Working and Reference Memory in Mice

1Division of Systems Medical Science, Institute for Comprehensive Medical Science, Fujita Health University, 2Japan Science and Technology Agency, Core Research for Evolutionary Science and Technology (CREST), 3Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, National Institutes of Natural Sciences

JoVE 3300


 Neuroscience

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Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice

1Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute at Lake Nona, 2Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, 3Vanderbilt Mouse Metabolic Phenotyping Center, Vanderbilt University School of Medicine, 4Department of Pediatrics and Cellular and Integrative Physiology, Indiana University School of Medicine

JoVE 3188


 Medicine

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Multi-photon Imaging of Tumor Cell Invasion in an Orthotopic Mouse Model of Oral Squamous Cell Carcinoma

1Department of Neurobiology and Anatomy, Program in Cancer Cell Biology, Mary Babb Randolph Cancer Center, West Virginia University, 2Sensory Neuroscience Research Center, West Virginia University, 3Departments of Otolaryngology and Physiology, Center for Neuroscience, West Virginia University

JoVE 2941


 Medicine

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Using Bioluminescent Imaging to Investigate Synergism Between Streptococcus pneumoniae and Influenza A Virus in Infant Mice

1Department of Microbiology and Immunology, University of Melbourne, 2Laboratory of Pediatric Infectious Diseases, Radboud University Nijmegen Medical Centre, 3The Centre for Dynamic Imaging, The Walter and Eliza Hall Institute for Medical Research

JoVE 2357


 Immunology and Infection

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The Subventricular Zone En-face: Wholemount Staining and Ependymal Flow

1Department of Neurosurgery, The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco - UCSF, 2Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, 3Department of Neuroscience and Neurology, College of Physicians and Surgeons, Columbia University, 4Department of Developmental and Regenerative Biology, Nagoya City University Graduate School of Medical Sciences, 5Center for Motor Neuron Biology and Disease, College of Physicians and Surgeons, Columbia University

JoVE 1938


 Neuroscience

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An Introduction to the Micropipettor

JoVE 5033

The micropipettor is a common laboratory instrument used for transferring microvolumes of liquid solutions. Micropipettors come in a range of sizes for the accurate movement of volumes between 0.5 and 5000 μl and each instrument requires one of three different sized disposable tips. Micropipettors work by displacing air from the pipette shaft, allowing the liquid to be drawn into the resulting vacuum. Their uses include transferring cell suspensions for a variety of cell-based assays, loading samples for different analytical techniques, and mechanically disrupting tissues into single cell suspensions. Micropipettors are an extremely helpful laboratory tools that are easy to use with a little bit of instruction and practice. In this video, JoVE shows the first-time user all the tips, tricks, and ins and outs of using a micropipettor in the lab.


 General Laboratory Techniques

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Yeast Reproduction

JoVE 5097

Saccharomyces cerevisiae is a species of yeast that is an extremely valuable model organism. Importantly, S. cerevisiae is a unicellular eukaryote that undergoes many of the same biological processes as humans. This video provides an introduction to the yeast cell cycle, and explains how S. cerevisiae reproduces both asexually and sexually Yeast reproduce asexually through a process known as budding. In contrast, yeast sometimes participate in sexual reproduction, which is important because it introduces genetic variation to a population. During environmentally stressful conditions, S. cerevisiae will undergo meiosis and form haploid spores that are released when environmental conditions improve. During sexual reproduction, these haploid spores fuse, ultimately forming a diploid zygote. In the lab, yeast can be genetically manipulated to further understand the genetic regulation of the cell cycle, reproduction, aging, and development. Therefore, scientists study the reproduction of yeast to gain insight into processes that are important in human biology.


 Biology I

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C. elegans Chemotaxis Assay

JoVE 5113

Chemotaxis is a process in which cells or organisms move in response to a chemical stimulus. In nature, chemotaxis is important for organisms to sense and move toward food sources and move away from stimuli that may be toxic or harmful. Chemotaxis is also important at the cellular level. For example, chemotaxis is required for the movement of sperm toward an egg prior to fertilization. In the lab, chemotaxis is frequently examined in the nematode, C. elegans, which is known to migrate towards food sources in soil, but away from toxins such as heavy metals, substances with a low pH, and detergents. This video demonstrates how to perform a chemotaxis assay, which includes preparing the chemotaxis plates and the worms, running the assay, and analyzing the data. Then, we discuss examples of how chemotaxis assays can be used in C. elegans as a tool to understand learning and memory, olfactory adaptation, and neurological disease such as Alzheimer"s disease. Chemotaxis experiments in C. elegans have near-limitless possibilities for learning more about the cellular and genetic mechanisms of many biological processes, and may lead to a greater understanding of human biology, development, and disease.


 Biology I

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Live Cell Imaging of Mitosis

JoVE 5642

Mitosis is a form of cell division in which a cell’s genetic material is divided equally between two daughter cells. Mitosis can be broken down into six phases, during each of which the cell’s components, such as its chromosomes, show visually distinct characteristics. Advances in fluorescence live cell imaging have allowed scientists to study this process in great detail, providing important insights into the biological control of this process and how it might go wrong in diseases such as cancer. We begin this video by breaking down the phases of mitosis, and introducing some important considerations for optimal visualization of the process using live cell imaging. We then walk through the steps for running a live cell mitosis imaging experiment and discuss various analysis methods, including the generation of montages, movies, and 3D recreations. Finally, we take a look at how visualizing the mitotic process can be applied to answering questions in cell biology.


 Cell Biology

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