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Transition Temperature: The temperature at which a substance changes from one state or conformation of matter to another.

Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light

1Institute for Complex Molecular Systems (ICMS), Technical University of Eindhoven, 2Department of Chemical Engineering and Chemistry, Laboratory of Macromolecular and Organic Chemistry, Technical University of Eindhoven, 3Department of Chemical Engineering and Chemistry, Laboratory for Functional Organic Materials and Devices (SFD), Technical University of Eindhoven

JoVE 56266


 Engineering

Evaluation of the Cell Invasion and Migration Process: A Comparison of the Video Microscope-based Scratch Wound Assay and the Boyden Chamber Assay

1UMR CNRS 5822 /IN2P3, IPNL, PRISME, Laboratoire de Radiobiologie Cellulaire et Moléculaire, Faculté de Médecine Lyon-Sud, Université Lyon 1, 2Département de Radiothérapie, Institut de Cancérologie de la Loire - Lucien Neuwirth, 3Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud

JoVE 56337


 Cancer Research

Purification of Ferrocene by Sublimation

JoVE 10429

Source: Tamara M. Powers, Department of Chemistry, Texas A&M University 

Sublimation, the direct phase transition of a solid into a gas without first becoming a liquid, takes place at temperatures and pressures lower than that of the compound's triple point (Figure 1).The process of sublimation can be utilized to purify both organic and inorganic solids. During the purification technique, a solid is heated directly into the gas-phase. All non-volatile impurities are left behind while the vaporized compound is then collected (deposition) as a solid on a cold surface. Here, we will use sublimation to purify ferrocene, an inorganic solid with a triple point temperature of 183 °C.1 Figure 1. Generic phase diagram. The colored lines represent the pressure and temperature requirements for phase transitions. Distillation of a solid will occur at pressures and temperatures above the triple point, represented by the green line in the phase diagram. The blue line represents the temperature and pressure conditions where sublimation occurs.


 Inorganic Chemistry

Atomically Traceable Nanostructure Fabrication

1Zyvex Labs, 2Department of Physics, University of Texas at Dallas, 3Department of Materials Science and Engineering, University of Texas at Dallas, 4Materials Science and Engineering, University of North Texas, 5National Institute of Standards and Technology

JoVE 52900


 Engineering

Characterization Of Multi-layered Fish Scales (Atractosteus spatula) Using Nanoindentation, X-ray CT, FTIR, and SEM

1Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 2Department of Mechanical Engineering, University of Alabama, 3Environmental Laboratory, U.S. Army Engineer Research and Development Center

JoVE 51535


 Bioengineering

Environmentally-controlled Microtensile Testing of Mechanically-adaptive Polymer Nanocomposites for ex vivo Characterization

1Advanced Platform Technology Center, Rehabilitation Research and Development, Louis Stokes Cleveland Department of Veterans Affairs Medical Center, 2Department of Biomedical Engineering, Case Western Reserve University, 3Department of Electrical Engineering and Computer Science, Case Western Reserve University

JoVE 50078


 Bioengineering

Separation of Spermatogenic Cell Types Using STA-PUT Velocity Sedimentation

1Department of Cell and Developmental Biology, University of Pennsylvania, 2Biomedical Graduate Studies, University of Pennsylvania, 3Department of Animal Biology and Center for Animal Transgenesis and Germ Cell Research, University of Pennsylvania, 4Department of Genetics, University of Pennsylvania, 5Department of Biology, University of Pennsylvania

JoVE 50648


 Biology

Establishment of a Clinic-based Biorepository

1Affiliated Dermatology & Affiliated Laboratories, Midwestern University Osteopathic Postdoctoral Training Institute, Midwestern University, 2Department of Microbiology & Immunology, Arizona College of Osteopathic Medicine, Midwestern University, 3Biomedical Sciences Program, College of Health Sciences, Midwestern University

JoVE 55583


 Medicine

Atmospheric Pressure Fabrication of Large-Sized Single-Layer Rectangular SnSe Flakes

1SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, 2Department of Physics, National University of Singapore, 3NUS Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences, 4Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore

Video Coming Soon

JoVE 57023


 JoVE In-Press

Ischemic Tissue Injury in the Dorsal Skinfold Chamber of the Mouse: A Skin Flap Model to Investigate Acute Persistent Ischemia

1Department of Plastic Surgery and Hand Surgery, Klinikum rechts der Isar, Technische Universität München, 2Department of Plastic, Reconstructive, Aesthetic and Hand Surgery, University Hospital of Basel, 3Institute for Clinical and Experimental Surgery, University of Saarland, 4Division of Plastic and Hand Surgery, University Hospital Zurich

JoVE 51900


 Medicine

Inactivation of mTor: A Tool to Investigate Meiotic Progression and Translational Control During Bovine Oocyte Maturation

1BVN Neustadt/Aisch, 2Faculty of Veterinary Medicine, Clinic for Obstetrics, Gynecology and Andrology of Large and Small Animals, Justus-Liebig-University Giessen, 3Reproductive Cell Biology Unit, Leibniz Institute for Farm Animal Biology, 4Reproductive Biochemistry Unit, Leibniz Institute for Farm Animal Biology

Video Coming Soon

JoVE 53689


 JoVE In-Press

Lewis Acid-Base Interaction in Ph3P-BH3

JoVE 10316

Source: Tamara M. Powers, Department of Chemistry, Texas A&M University 

One of the goals of chemistry is to use models that account for trends and provide insights into the properties of reactants that contribute to reactivity. Substances have been classified as acids and bases since the time of the ancient Greeks, but the definition of acids and bases has been modified and expanded over the years.1 The ancient Greeks would characterize substances by taste, and defined acids as those that were sour-tasting, such as lemon juice and vinegar. The term "acid" is derived from the Latin term for "sour-tasting." Bases were characterized by their ability to counteract or neutralize acids. The first bases characterized were those of ashes from a fire, which were mixed with fats to make soap. In fact, the term "alkaline" is derived from the Arabic word for "roasting." Indeed, it has been known since ancient times that acids and bases can be combined to give a salt and water. The first widely-used description of an acid is that of the Swedish chemist, Svante Arrhenius, who in 1894 defined acids as substances which dissociate in water to give hydronium ions, and bases as substances which dissociate in water to give


 Inorganic Chemistry

Utilizing Functional Genomics Screening to Identify Potentially Novel Drug Targets in Cancer Cell Spheroid Cultures

1The Breast Cancer Now Toby Robins Research Centre, Division of Breast Cancer, The Institute of Cancer Research, 2Division of Molecular Pathology, The Institute of Cancer Research, 3Institute of Cancer Sciences, University of Manchester

JoVE 54738


 Cancer Research

Creating a Structurally Realistic Finite Element Geometric Model of a Cardiomyocyte to Study the Role of Cellular Architecture in Cardiomyocyte Systems Biology

1Cell Structure and Mechanobiology Group, Department of Biomedical Engineering, University of Melbourne, 2Systems Biology Laboratory, Melbourne School of Engineering, University of Melbourne, 3Department of Biomedical Engineering, University of Melbourne, 4Department of Engineering Science, University of Auckland, 5Advanced Microscopy Facility, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, 6School of Medicine, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, 7School of Mathematics and Statistics, Faculty of Science, University of Melbourne, 8ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, University of Melbourne, 9Living Systems Institute, University of Exeter

Video Coming Soon

JoVE 56817


 JoVE In-Press

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