Scientists are using stem cells from amniotic fluid to promote the growth of functional blood vessels in healing hydrogels. In new experiments, the scientists combined versatile amniotic stem cells with injectable hydrogels used as scaffolds in regenerative medicine and proved they enhance the development of vessels needed to bring blood to new tissue and carry waste products away.
Rice Univ. scientists have found the balance necessary to aid healing with high-tech hydrogel....
Stroke victims could have more time to seek treatment that could reduce harmful effects on the...
Univ. of Illinois engineers are bringing a touch of color to glucose monitoring. The researchers developed a new continuous glucose monitoring material that changes color as glucose levels fluctuate, and the wavelength shift is so precise that doctors and patients may be able to use it for automatic insulin dosing—something now possible using current point measurements like test strips.
Current drug delivery systems used to administer chemotherapy to cancer patients typically release a constant dose of the drug over time, but a new study challenges this "slow and steady" approach and offers a novel way to locally deliver the drugs "on demand," as reported in the Proceedings of the National Academy of Sciences.
When stem cells are used to regenerate bone tissue, many wind up migrating away from the repair site, which disrupts the healing process. But a technique employed by a Univ. of Rochester research team keeps the stem cells in place, resulting in faster and better tissue regeneration. The keyis encasing the stem cells in polymers that attract water and disappear when their work is done.
Rice Univ. bioengineers have created a hydrogel that instantly turns from liquid to semisolid at close to body temperature—and then degrades at precisely the right pace. The gel shows potential as a bioscaffold to support the regrowth of bone and other 3-D tissues in a patient’s body using the patient’s own cells to seed the process.
Stem cells have the potential to repair human tissue and maintain organ function in chronic disease, but a major problem has been how to mass-produce such a complex living material. Scientists in the U.K. have now developed a new substance which could simplify the manufacture of therapeutic cells by allowing both self-renewal of cells and evolution into cardiomyocyte cells.
Combatting the tissue degrading enzymes that cause lasting damage following a heart attack is tricky. Each patient responds to a heart attack differently and damage can vary from one part of the heart muscle to another, but existing treatments can’t be fine-tuned to deal with this variation. Univ. of Pennsylvania researchers have developed a way to address this problem via a material that can be applied directly to the damaged heart tissue.
A bit of pressure from a new shrinking, sponge-like gel is all it takes to turn transplanted unspecialized cells into cells that lay down minerals and begin to form teeth. The bioinspired gel material could one day help repair or replace damaged organs, such as teeth and bone, and possibly other organs as well.
Protein from a small, tasty mollusk inspired Michigan Technological Univ.’s Bruce P. Lee to invent a new type of hydrogel actuator. Hydrogels are soft networks of polymers with high water content, like jello. Because of their soft, gentle texture, they have the potential to interact safely with living tissues and have applications in a number of medical areas, including tissue engineering.
A group of Washington State Univ. researchers has developed a chewing gum-like battery material that could dramatically improve the safety of lithium-ion batteries. High-performance lithium batteries are popular in everything from computers to airplanes because they are able to store a large amount of energy compared to other batteries. Their biggest potential risk, however, comes from the electrolyte in the battery.
Researchers at the Univ. of Delaware have developed a “smart” hydrogel that can deliver medicine on demand, in response to mechanical force. Over the past few decades, smart hydrogels have been created that respond to pH, temperature, DNA, light and other stimuli.
A Duke Univ. research team has developed a better recipe for synthetic replacement cartilage in joints. Combining two innovative technologies, the team found a way to create artificial replacement tissue that mimics both the strength and suppleness of native cartilage. Articular cartilage is the tissue on the ends of bones where they meet at joints in the body.
A research team in France has invented an adhesion method that creates a strong bond between two gels by spreading on their surface a solution containing nanoparticles. Until now, there was no entirely satisfactory method of obtaining adhesion between two gels or two biological tissues. The bond is resistant to water and uses no polymers or chemical reactions.
Rice Univ. bioengineers have developed a hydrogel scaffold for craniofacial bone tissue regeneration that starts as a liquid, solidifies into a gel in the body and liquefies again for removal. The material developed in a Rice laboratory is a soluble liquid at room temperature that can be injected to the point of need. At body temperature, it turns into a gel to help direct the formation of new bone to replace that damaged by injury.
Scientists are reporting development of a squishy gel that, when compressed at a key location such as a painful knee joint, releases anti-inflammatory medicine. The new material could someday deliver medications when and where osteoarthritis patients need it most.
To gauge whether suspects involved in accidents or routine traffic stops have been driving drunk, police officers pair field sobriety tests with breathalyzers. Most breathalyzers are expensive and unable to test for precise concentrations of alcohol. Offering a better solution, Italian researchers have developed a novel idea for an inexpensive, portable breathalyzer.
Tissues designed with pre-formed vascular networks are known to promote rapid vascular integration with the host. Generally, prevascularization has been achieved by seeding or encapsulating endothelial cells, but these methods are slow. Hydrogels have also been tried, but a new technique developed in Singapore uses hydrogels with a new patterning process to quickly incorporate different cell types separately into different fibers.
Some animals, like the octopus and cuttlefish, transform their shape based on environment. For decades, researchers have worked toward mimicking similar biological responses in non-living organisms, as it would have significant implications in the medical arena. Now, researchers at the Univ. of Pittsburgh have demonstrated such a biomimetic response using hydrogels.
Stanford Univ. scientists have dramatically improved the performance of lithium-ion batteries by creating novel electrodes made of silicon and conducting polymer hydrogel, a spongy material similar to that used in contact lenses and other household products. The scientists developed a new technique for producing low-cost, silicon-based batteries with potential applications for a wide range of electrical devices.
It’s a familiar scenario—a patient receives a medical implant and days later, the body attacks the artificial valve or device, causing complications to an already compromised system. Expensive medical devices and surgeries often are thwarted by the body’s natural response to attack something in the tissue that appears foreign. Now, University of Washington engineers have demonstrated in mice a way to prevent this sort of response.
Coating medical supplies with an antimicrobial material is one approach that bioengineers are using to combat the increasing spread of multidrug-resistant bacteria. A research team in Singapore has now developed a highly effective antimicrobial coating based on cationic polymers. The coating can be applied to medical equipment, such as catheters.
Surfactant molecules, which are commonly found in soaps and detergents, have two main parts, a head and a tail, that help them break down and penetrate grease and oil. A research team has recently built a palm-sized microfluidics tool that passes water, detergent, and salt through tiny posts, producing a viscous, elastic gel that requires fewer surfactant molecules.
Gelatin sets by forming a solid matrix full of random, liquid-filled pores—much like a saturated sponge. It turns out that a similar process also happens in some metallic glasses, substances whose molecular behavior has now been clarified by new Massachusetts Institute of Technology research detailing the “setting” of these metal alloys.
Scientists in China say they have developed the world's lightest material, which they expect to play an important role in tackling pollution. Call graphene aerogel, or simply carbon aerogel, the new material has a density of just 0.16 milligrams per cubic centimeter, a sixth that of air. It is derived from a gel, with the liquid component replaced by a gas. It appears in solid state with extremely low density.
A research team at the National Institute of Materials Science in Japan has recently developed a gel material which is capable of releasing drugs in response to pressure applied by the patient. Three fingers applying force to the site of the gel produces an effect for up to three days. They built the new drug from two materials already used in pharmaceuticals: a saccharide and a natural component of algae.
Bacterial biofilms, which diseased groupings of cells found in 80% of infections, are a significant health hazard and one of the biggest headaches for hospitals and their constant battle against disease. Researchers from IBM, with the help of scientists in Singapore, revealed today a synthetic antimicrobial hydrogel that can break through diseased biofilms and completely eradicate drug-resistant bacteria upon contact. It is the first hydrogel to be biodegradable, biocompatible, and non-toxic.
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