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Regression Analysis: Procedures for finding the mathematical function which best describes the relationship between a dependent variable and one or more independent variables. In linear regression (see Linear models) the relationship is constrained to be a straight line and Least-squares analysis is used to determine the best fit. In logistic regression (see Logistic models) the dependent variable is qualitative rather than continuously variable and Likelihood functions are used to find the best relationship. In multiple regression, the dependent variable is considered to depend on more than a single independent variable.

Detecting Estrogenic Ligands in Personal Care Products using a Yeast Estrogen Screen Optimized for the Undergraduate Teaching Laboratory

1Department of Biology, University of the South, 2School of Biological Sciences, Louisiana Tech University, 3School of Medicine, Louisiana State University Health Sciences Center, 4Department of Biology, Furman University, 5Department of Computer Science, Louisiana Tech University, 6Clemson University

JoVE 55754


 Biology

Online Transcranial Magnetic Stimulation Protocol for Measuring Cortical Physiology Associated with Response Inhibition

1College of Medicine, University of Cincinnati, 2Division of Neurology, Cincinnati Children's Hospital Medical Center, 3Division of Psychiatry, Cincinnati Children's Hospital Medical Center, 4Center for Neurodevelopmental and Imaging Research, Kennedy Krieger Institute

Video Coming Soon

JoVE 56789


 JoVE In-Press

The α-test: Rapid Cell-free CD4 Enumeration Using Whole Saliva

1Department of Medicine, Weill Cornell Medical College, 2Department of Oral Biology, University of Missouri-Kansas City-School of Dentistry, 3Department of Pharmacology and Toxicology, University of Missouri Kansas City- School of Pharmacy, 4Regional Hospital, Bamenda, NWP, Cameroon, 5Mezam Polyclinic HIV/AIDS Treatment Center, Cameroon, 6Institute for Human Genetics and Biochemistry

JoVE 3999


 Medicine

Simultaneous Evaluation of Cerebral Hemodynamics and Light Scattering Properties of the In Vivo Rat Brain Using Multispectral Diffuse Reflectance Imaging

1Graduate School of Bio-application & Systems Engineering, Tokyo University of Agriculture & Technology, 2Division of Biomedical Information Sciences, National Defense Medical College Research Institute, 3Graduate School of Science and Engineering, Yamagata University

JoVE 55399


 Neuroscience

Whole-brain Segmentation and Change-point Analysis of Anatomical Brain MRI—Application in Premanifest Huntington's Disease

1The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, 2Center for Imaging Science, Johns Hopkins University, 3Institute for Computational Medicine, Johns Hopkins University, 4Department of Applied Mathematics and Statistics, Johns Hopkins University, 5Division of Neurobiology, Departments of Psychiatry, Neurology, Neuroscience and Pharmacology, and Program in Cellular and Molecular Medicine, Johns Hopkins University School of Medicine, 6F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, 7Department of Biomedical Engineering, Johns Hopkins University

Video Coming Soon

JoVE 57256


 JoVE In-Press

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding

1The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, 2Department of Neurology and neurosurgery, Johns Hopkins University School of Medicine, 3Departments of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, 4Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine

JoVE 55561


 Biochemistry

Calibration Curves

JoVE 10188

Source: Laboratory of Dr. B. Jill Venton - University of Virginia

Calibration curves are used to understand the instrumental response to an analyte and predict the concentration in an unknown sample. Generally, a set of standard samples are made at various concentrations with a range than includes the unknown of interest and the instrumental response at each concentration is recorded. For more accuracy and to understand the error, the response at each concentration can be repeated so an error bar is obtained. The data are then fit with a function so that unknown concentrations can be predicted. Typically the response is linear, however, a curve can be made with other functions as long as the function is known. The calibration curve can be used to calculate the limit of detection and limit of quantitation. When making solutions for a calibration curve, each solution can be made separately. However, that can take a lot of starting material and be time consuming. Another method for making many different concentrations of a solution is to use serial dilutions. With serial dilutions, a concentrated sample is diluted down in a stepwise manner to make lower concentrations. The next sample is made from the previous dilution, and the dilution factor is often kept constant. The advantage is that only one


 Analytical Chemistry

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

1Transfusion Research Center, Belgian Red Cross-Flanders, 2Faculty of Medicine and Health Sciences, Ghent University, 3Blood Service, Belgian Red Cross-Flanders, 4Department of Public Health and Primary Care, KULeuven - University of Leuven

JoVE 55351


 Bioengineering

Ecotoxicological Method with Marine Bacteria Vibrio anguillarum to Evaluate the Acute Toxicity of Environmental Contaminants

1Institute for Environmental Protection and Research (ISPRA), Rome (Italy), 2Department of Biology, Tor Vergata University, Rome (Italy), 3Department of Biology and Evolution of Marine Organisms, Stazione Zoologica, Anton Dohrn, Naples (Italy)

JoVE 55211


 Environment

Identifying DNA Mutations in Purified Hematopoietic Stem/Progenitor Cells

1Greehey Children's Cancer Research Institute, UT Health Science Center at San Antonio, 2Department of Cellular and Structural Biology, UT Health Science Center at San Antonio, 3Department of Pathology, UT Health Science Center at San Antonio, 4Department of Microbiology, UT Health Science Center at San Antonio, 5Cancer Therapy and Research Center, UT Health Science Center at San Antonio

JoVE 50752


 Immunology and Infection

Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients

1Department of Biomedical Science, The Bateson Centre, University of Sheffield, 2Institute of Genetic Medicine, Newcastle University, 3Department of Cardiovascular Science, The Bateson Centre, University of Sheffield, 4School of Biochemistry, University of Bristol, 5Biology Department, University of York

JoVE 53162


 Developmental Biology

Ideal Gas Law

JoVE 5537

Source: Laboratory of Dr. Andreas Züttel - Swiss Federal Laboratories for Materials Science and Technology

The ideal gas law describes the behavior of most common gases at near-ambient conditions and the tendency of all chemical matter in the dilute limit. It is a fundamental relationship between three measurable macroscopic system variables (pressure, temperature, and volume) and the number of molecules of gas in the system, and is therefore an essential link between the microscopic and the macroscopic universes. The history of the ideal gas law dates to the middle of the 17th century when the relationship between the pressure and volume of air was found to be inversely proportional, an expression confirmed by Robert Boyle and which we now refer to as Boyle’s law (Equation 1). P V-1 (Equation 1) Unpublished work by Jacques Charles in the 1780s, which was extended to numerous gases and vapors by Joseph Louis Gay-Lussac and reported in 1802, established the directly proportional relationship between the absolute temperature and volume of a gas. This relationship is called Charles's law (Equ


 General Chemistry

Performing Permanent Distal Middle Cerebral with Common Carotid Artery Occlusion in Aged Rats to Study Cortical Ischemia with Sustained Disability

1Wolfson Centre for Age-Related Diseases, King's College London, University of London, 2Department of Neuroimaging, James Black Centre, Institute of Psychiatry, King's College London, University of London, 3Institute of Neuroscience and Psychology, Wellcome Surgical Institute, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, 4Research Service, Edward Hines Jr. VA Hospital, 5Neurology Service, Edward Hines Jr. VA Hospital, 6Department of Molecular Pharmacology and Therapeutics, Neuroscience Research Institute, Loyola University Chicago, 7Department of Oncology, The Gray Institute for Radiation, Oncology and Biology, University of Oxford

JoVE 53106


 Medicine

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