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Normal Distribution: Continuous frequency distribution of infinite range. Its properties are as follows: 1, continuous, symmetrical distribution with both tails extending to infinity; 2, arithmetic mean, mode, and median identical; and 3, shape completely determined by the mean and standard deviation.

Natural Selection - Student Protocol

JoVE 10593

Simulating Natural Selection
To begin, cut the white, black, and gray pipe cleaners into quarters, which should produce a total of 100 pieces that are 3 inches long.
Then, cut the green pipe cleaners in the quantities and lengths specified in the video, taking care to minimize waste. This approximates a normal distribution of lengths and should…

 Lab Bio

Natural Selection- Concept

JoVE 10632

Fitness

Widespread variation of phenotypes in natural populations provides the raw material for evolution, which is the change in the inherited traits of populations over successive generations. Natural selection is one of the main mechanisms of evolution and requires variable traits to be heritable and associated with differential survival and/or reproductive success. Phenotypes that…

 Lab Bio

Single and Two-phase Flow in a Packed Bed Reactor

JoVE 10431

Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA


The goal of this experiment is to determine the magnitude of maldistribution in typical packed bed reactors in both single phase and two-phase (gas-liquid) flow and evaluate the effects of this maldistribution on…

 Chemical Engineering

The Precision of Visual Working Memory with Delayed Estimation

JoVE 10020

Source: Laboratory of Jonathan Flombaum—Johns Hopkins University



Human memory is limited. Throughout most of its history, experimental psychology has focused on investigating the discrete, quantitative limits of memory—how many individual pieces of information a person can remember. Recently,…

 Cognitive Psychology

Drosophila Courtship Conditioning As a Measure of Learning and Memory

1Department of Human Genetics, Radboud University Medical Center, 2Radboud Institute of Molecular Life Sciences, Radboud University, 3Donders Institute for Brain, Cognition, and Behaviour, Centre for Neuroscience, Radboud University, 4Research Institute of Molecular Pathology, Vienna, Austria, 5Department for Health Evidence, Radboud University Medical Center, 6Janelia Research Campus, Howard Hughes Medical Institute, 7Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, 8Department of Biology, Faculty of Science, Western University

JoVE 55808

 Neuroscience

Short-Term Free-Floating Slice Cultures from the Adult Human Brain

1Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, 2Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, 3Department of Pathology and Forensic Medicine, Ribeirão Preto Medical School, University of São Paulo, 4Department of Anatomy, Institute of Biosciences, São Paulo State University, 5Clinical Hospital at the Ribeirão Preto Medical School, University of São Paulo

Video Coming Soon

JoVE 59845

 JoVE In-Press

Simple and Effective Administration and Visualization of Microparticles in the Circulatory System of Small Fishes Using Kidney Injection

1Institute of Biology at Irkutsk State University, 2Institute of Biology at Karelian Research Centre of Russian Academy of Sciences, 3Baikal Research Centre, 4Institute of Materials Research and Engineering, Agency for Science, Technology, and Research (A*STAR), 5University of Oulu, Optoelectronics and Measurement Techniques Laboratory

JoVE 57491

 Biology

Anogenital Distance and Perineal Measurements of the Pelvic Organ Prolapse (POP) Quantification System

1Department of Obstetrics & Gynecology, "Virgen de la Arrixaca", University Clinical Hospital, 2Institute for Biomedical Research of Murcia, IMIB-Arrixaca, 3Division of Preventive Medicine and Public Health, Department of Public Health Sciences, University of Murcia School of Medicine, 4Biomedical Research Centre Network for Epidemiology and Public Health (CIBERESP), 5Department of Preventive Medicine, "Virgen de la Arrixaca", University Clinical Hospital

JoVE 57912

 Medicine

Production and Measurement of Organic Particulate Matter in a Flow Tube Reactor

1School of Engineering and Applied Sciences, Harvard University, 2Department of Environmental Science and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, 3Department of Chemistry, Northwestern University, 4Department of Earth and Planetary Sciences, Harvard University

JoVE 55684

 Environment

A Model to Simulate Clinically Relevant Hypoxia in Humans

1Department of Anaesthesiology and Intensive Care Medicine, University Hospital of Bonn, 2Institute of Clinical Chemistry and Clinical Pharmacology, University of Bonn, 3Institute for Terrestrial and Aquatic Wildlife Research, University of Veterinary Medicine Hannover, 4Institute of Physiology 2, University of Bonn

JoVE 54933

 Medicine

Measurement of Differentially Methylated INS DNA Species in Human Serum Samples as a Biomarker of Islet β Cell Death

1Department of Pediatrics, IU Center for Diabetes and Metabolic Disease, Indiana University School of Medicine, 2Department of Pediartics, Omaha Children's Hospital and Medical Center, University of Nebraska Medical Center, 3Departments of Biochemistry and Molecular Biology, Medicine, and Cellular and Integrative Physiology, IU Center for Diabetes and Metabolic Disease, Indiana University School of Medicine, 4Indiana Biosciences Research Institute

JoVE 54838

 Genetics

Measurement of Survival Time in Brachionus Rotifers: Synchronization of Maternal Conditions

1Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 2School of Marine Biosciences, Department of Marine Biosciences, Kitasato University, 3Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, Marine Biological Laboratory, 4School of Arts and Sciences, University of Houston-Victoria

JoVE 54126

 Biology

Visualization Method for Proprioceptive Drift on a 2D Plane Using Support Vector Machine

1Applied Brain Science Laboratory, Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2Department of Informatics, Graduate School of Informatics and Engineering, The University of Electro-Communications, 3Department of Media and Image Technology, Faculty of Engineering, Tokyo Polytechnic University

JoVE 53970

 Behavior
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