Show Advanced Search

REFINE YOUR SEARCH:

Containing Text
- - -
+
Filter by author or institution
GO
Filter by publication date
From:
October, 2006
Until:
Today
Filter by journal section

Filter by science education

 
 
Tensile Strength: The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001)

Tensile Strength of Resorbable Biomaterials

JoVE 10471

Source: Peiman Shahbeigi-Roodposhti and Sina Shahbazmohamadi, Biomedical Engineering Department, University of Connecticut, Storrs, Connecticut


For over 4000 years, sutures have been used as a medical intervention. The earliest records indicate linen was the biomaterial of choice. Catgut, which is still in use today, was reportedly used to …

 Biomedical Engineering

Adapted Resistance Training Improves Strength in Eight Weeks in Individuals with Multiple Sclerosis

1Motion Analysis Laboratory, Kennedy Krieger Institute, 2Physical Medicine & Rehabilitation, Johns Hopkins University School of Medicine, 3Johns Hopkins University School of Medicine, 4Department of Neurology, Johns Hopkins University School of Medicine

JoVE 53449

 Medicine

Tests of Hardened Concrete in Tension

JoVE 10423

Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA


In a previous laboratory focused on concrete in compression, we observed that concrete can withstand very large stresses under uniaxial compressive forces. However, the failures observed were not compressive failures but failures…

 Structural Engineering

Rockwell Hardness Test and the Effect of Treatment on Steel

JoVE 10386

Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA


Hardness testing is one of the most universally valuable mechanical tests available to engineers, as it is both simple and relatively inexpensive for the wealth of information and data it produces. Hardness testing, generally in the…

 Structural Engineering

Tension Test of Fiber-Reinforced Polymeric Materials

JoVE 10417

Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA


Fiber-reinforced polymeric materials (FRP) are composite materials that are formed by longitudinal fibers embedded in a polymeric resin, thereby creating a polymer matrix with aligned fibers along…

 Structural Engineering

Compression Tests on Hardened Concrete

JoVE 10421

Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA


There are two distinct stages in a construction project involving concrete. The first stage involves batching, transporting, and casting fresh concrete. At this stage, the material is viscous, and the workability and finishability…

 Structural Engineering

The Extracellular Matrix

JoVE 10695

In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.

The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse molecules. These molecules include polysaccharides called glycosaminoglycans (GAGs). GAGs occupy most of the extracellular space and often take up a large volume relative to their mass. This results in a matrix that can withstand tremendous forces of compression. Most GAGs are linked to proteins—creating proteoglycans. These molecules retain sodium ions based on their positive charge and therefore attract water, which keeps the ECM hydrated. The ECM also contains rigid fibers such as collagens—the primary protein component of the ECM. Collagens are the most abundant proteins in animals, making up 25% of protein by mass. A large diversity of collagens with structural similarities provide tensile strength to many tissues. Notably, tissue like skin, blood vessels, and lungs need to be both strong and stretchy to perform their physiological role. A protein called elastin gives p

 Core: Cell Structure and Function

Fatigue of Metals

JoVE 10416

Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA


The importance of studying metal fatigue in civil infrastructure projects was brought into the spotlight by the collapse of the Silver Bridge in Point Pleasant, West Virginia in 1967. The eyebar-chain suspension bridge over the Ohio River …

 Structural Engineering

Stress-Strain Characteristics of Aluminum

JoVE 10362

Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA


Aluminum is one of the most abundant materials in our lives, as it is omnipresent in everything from soda cans to airplane components. Its widespread use is relatively recent (1900AD), primarily because aluminum does not occur in its …

 Structural Engineering

Stress-Strain Characteristics of Steels

JoVE 10361

Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA


The importance of materials to human development is clearly captured by the early classifications of world history into periods such as the Stone Age, Iron Age, and the Bronze Age. The introduction of the Siemens and Bessemer…

 Structural Engineering

Electrospinning of Silk Biomaterials

JoVE 5798

Silk fibers have been processed and used to create fabrics and threads for centuries. However, the solubilizing of silk fibers, thereby turning it into a versatile pre-polymer solution is a much newer technology. Solubilized silk can be processed in many different ways to create a biocompatible material with controllable mechanical properties.


 Bioengineering

Purification of a Total Lipid Extract with Column Chromatography

JoVE 10159

Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst


The product of an organic solvent extraction, a total lipid extract (TLE), is often a complex mixture of hundreds, if not thousands, of different compounds. The researcher is often only interested in a handful of compounds. The compounds of interest may belong to …

 Earth Science

Synthesis of Thermogelling Poly(N-isopropylacrylamide)-graft-chondroitin Sulfate Composites with Alginate Microparticles for Tissue Engineering

1Department of Chemical Engineering, Rowan University, 2Department of Biological Sciences, Rowan University, 3Department of Biomedical Engineering, Drexel University

JoVE 53704

 Bioengineering

Effects of Allogeneic Platelet-Rich Plasma (PRP) on the Healing Process of Sectioned Achilles Tendons of Rats: A Methodological Description

1Experimental Surgery, GIGA-R & Credec, University of Liège, 2Laboratory of Connective Tissues Biology, GIGA-R, University of Liège, 3Department Argenco, University of Liège, 4Department of Clinical Biology, University Hospital of Liège, University of Liège, 5Physical Medicine and Sport Traumatology Department, FIFA Medical Center of Excellence, University Hospital of Liège, University of Liège

JoVE 55759

 Medicine

Fabrication and Design of Wood-Based High-Performance Composites

1Wood Materials Science, Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, 2Cellulose & Wood Materials, Functional Materials, EMPA, 3Design and Arts, Lucerne University of Applied Sciences and Arts, 4Aerospace Manufacturing Technologies, Aerospace Engineering, Delft University of Technology, 5Stora Enso Oyj

Video Coming Soon

JoVE 60327

 JoVE In-Press

Two Methods for Decellularization of Plant Tissues for Tissue Engineering Applications

1Department of Surgery, University of Wisconsin-Madison, 2Department of Orthopedics and Rehabilitation, University of Wisconsin School of Medicine and Public Health, 3Department of Biomedical Engineering, University of Wisconsin College of Engineering, 4Department of Biomedical Engineering, Worcester Polytechnic Institute

JoVE 57586

 Bioengineering

Scanning Electron Microscopy of Macerated Tissue to Visualize the Extracellular Matrix

1Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, 2Department of Medicine, Vanderbilt University Medical Center, 3Division of Cardiovascular Medicine, Vanderbilt University Medical Center, 4Cardiovascular Institute, Maine Medical Center

JoVE 54005

 Biology
12
More Results...