National Insitute of Standards and Technology (NIST) scientists are taking their knowledge of mechanical tensile strength tests in metals and composites and applying it to medical research problems. Doctors long have known that babies born with congenital heart defects at higher altitudes have an increased risk of developing complications, such as pulmonary hypertension. Could there be some way to trick the arterial walls so that they wouldnt stiffen under increased blood pressure?
Working with the Childrens Hospital and University of Colorado Health Sciences Center in Denver, NIST researchers have used rat arteries--both normal and hypertensive--supplied by the university center and placed them in a mechanical stress tester. The tester holds a small disc-shaped sample of the arterial tissue that is slowly stretched by pumping a special liquid against the back of the disc. The pressure of the liquid causes a bubble to form on the front of the disc. The shape of the resulting bubble helps the researchers determine details about the tissues elasticity, strength, stiffness and other properties.
" Hypertensive tissue should be stiffer, so we will get less inflation with the same amount of pressure," says NIST researcher Elizabeth Drexler. "What we want to know is what it is in the artery that causes it to stiffen. Is it more collagen? Is it the smooth muscle cells? Perhaps we could give the muscle cell a signal not to produce more collagen." So far they have studied 20 rat arteries and plan to study 20 more, along with some calf arteries. A preliminary report that verifies their test method appears in the May/June issue of the NIST Journal of Research.
Fred McGehan | EurekAlert!
Lego-like wall produces acoustic holograms
17.10.2016 | Duke University
New evidence on terrestrial and oceanic responses to climate change over last millennium
11.10.2016 | University of Granada
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
06.12.2016 | Materials Sciences
06.12.2016 | Medical Engineering
06.12.2016 | Power and Electrical Engineering