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Tag: "polymer" at biology news

University of Pittsburgh School of Medicine researchers develop 'off-the-shelf' vascular grafts

...cle-derived stem cells (MDSCs) and a biodegradable polymer that exhibit extensive remodeling and remain free ...ere was an extensive remodeling of the MDSC-seeded polymer by surrounding tissue, exhibiting tissue formation that is consistent with a mature artery. Accor...

Technique monitors thousands of molecules simultaneously

... chip with a polymer, attaching a substrate to the polymer right above the electrode, and then using the electrode to initiate a chemical reaction that modified the substrate and converted it into a product. Putting a confining agent into the solution destroys the reagent made, keeping it from going to anoth...

Biodegradable microspheres deliver time release vaccines, stimulate different immune response

...ivery system using microspheres of a biodegradable polymer may not only reduce the need for booster shots in ...polyandydride, in a microsphere formulation. This polymer was already being used as a delivery system for a brain cancer drug designed to inhibit tumor growth...

Penn researchers show how nanocylinders deliver medicine better than nanospheres

... that contained one water-loving chain of a common polymer called polyethyleneglycol (PEG). PEGs are commonly found in everyday items like shampoo and some foods. Although synthetic, PEGs have already been approved as biocompatible to humans, making them ideal carriers, note the researchers. While these f...

Nanotextured implant materials: blending in, not fighting back

...r, the team molded pieces of PLGA, a biodegradable polymer often used for blood vessel grafts, so they came out completely covered with bumps that were 100, 200 or 500 nanometers in diameter. The surface with 200-nanometer features strongly favored the adsorption and spreading of fibronectin, a protein that ...

Sheffield scientists light up bacteria

...nsor to detect bacteria. The new method will use a polymer which will give a fluorescent signal when it encounters bacteria, allowing scientists to easily identify infected wounds much earlier than using conventional methodologies. The new technology will be of immediate benefit to healthcare industries i...

Applied scientists create wrinkled 'skin' on polymers

...s of polydimethylsiloxane, a silicon-based organic polymer (more commonly known as the primary ingredient in ...he ion beam alters the chemical composition of the polymer close to its surface and forms a thin stiff skin which wants to expand," explains Vaziri. "The conse...

Scientists create dual-modality microbeads to improve identification of disease biomarkers

...hed with ethanol. Then the beads are coated with a polymer that creates a hydrophilic surface on the beads. This allows the beads to be functionalized by adding antibodies or DNA molecules to the surface that will capture the target molecules. These beads are dual-function -- both optical and magnetic -- ...

New synthetic self-assembling macromolecules mimic nature

...t Virginia Tech, and Min Mao, a Ph.D. candidate in polymer chemistry, report the synthesis of a new family of charged, rod-like block copolymers. Only as long as a fraction of the diameter of human hair, the tiny rods can be either positive or negative, or can have alternating positive and negative charges ...

Nanotechnology shows promise as next wrinkle fighter

...er has discovered that nanoparticles can stop thin polymer films from buckling and wrinkling. It's a new solu...article addresses breakthroughs in the buckling of polymer films as they were compressed or heated during the manufacturing process, Ilsoon said the principles...

Ultrathin films deliver DNA as possible gene therapy tool

... to films that release DNA is in the choice of the polymer and the layer-cake design. The researchers alternate layers of DNA with layers of a polymer that is stable when dry but that degrades when exposed to water. Because the polymers carry a posit...

Researcher examines polymers created with poultry feathers

...t stiffness and smell. These will help the keratin polymer be processed faster, be more aesthetically pleasing, and become water resistant and stronger for increased longevity. ...

MIT bioengineer advances survival, promise of adult stem cells

...tion and so forth," Griffith said. The ceramic and polymer scaffold, which remains in the patient's body during healing but then resorbs, also provides structure for the stem cells as they grow into new bone cells. "We found that when EGF was tethered to the surface it elicited different cell responses t...

Dopamine used to prompt nerve tissue to regrow

...grate dopamine, a type of neurotransmitter, into a polymer to stimulate nerve tissues to send out new connect...tep toward the eventual goal of implanting the new polymer into patients suffering from neurological disorders to help repair damaged nerves. The findings were...

NHGRI aims to make DNA sequencing faster, more cost effective

...ue used to understand the mechanical properties of polymer molecules or chemical bonds, to DNA undergoing arrested polymerization to initially demonstrate one-molecule-at-a-time analysis of changes in molecular mechanics at a resolution of a single base. Using optical, near-field probes, the methods of force...

Engineered yeast speeds ethanol production

...plays a crucial role. First, cornstarch or another polymer of glucose is broken down into single sugar (glucose) molecules by enzymes, then yeast ferments the glucose into ethanol and carbon dioxide. Last year, four billion gallons of ethanol were produced from 1.43 billion bushels of corn grain (includin...

Carnegie Mellon scientists use 'green' approach to transform plastics manufacturing

...added. During ATRP, scientists produce a complex polymer structure using a special catalyst to add one or a few monomer units at a time to a growing polymer chain. ATRP requires a balance between two species of copper (Cu) catalyst, CuI and CuII. But as an ...

Biodegradable napkin -- featuring sensitive nanofibers -- may quickly detect biohazards

...idin, which can hold the antibodies. Composed of a polymer compound made from corn, the nanofibers could be incorporated into conventional paper products to keep costs low. Nanofibers, with diameters near 100 nanometers (a nanometer is one-billionth of a meter, or about three times the diameter of an atom), ...

An artificial cornea is in sight, thanks to biomimetic hydrogels

...s way into artificial corneas. It's a hydrogel, or polymer that holds a lot of water. That material may promi... with potential sponsors and provided insight into polymer physics. Nabeel Farooqui in Ophthalmology developed histology procedures. Won-Gun Koh, a former post...

Scientists find new way to manipulate DNA

... to reduce flow drag to gene therapy. But long polymer chains are subject to breakage, called scission, a...emy of Sciences. The paper, "Universal scaling for polymer chain scission in turbulence," defines which flow forces and at what levels those forces cause polym...

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