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Tag: "spheres" at biology news

Bacteria ferry nanoparticles into cells for early diagnosis, treatment

...by its outer membrane, forming "vesicles," or tiny spheres that are drawn into the cell's interior. Once inside the cell, the bacteria dissolve the vesicle membrane and release the cargo. The method might be used to take images of diseased tissues by inserting a cargo of fluorescent molecules into tumors ...

Students invent protective pouch to enhance cell therapy

...g with semi-permeable alginate microcapsules ?tiny spheres that surround the injected cells and protect them ...om the body’s immune system. At the same time, the spheres allow beneficial proteins to flow out and oxygen and glucose to flow freely in. Arepally and Bulte, ...

Study shows isolation of stem cells may lead to a treatment for hearing loss

...velopment and hair cell markers. The formation of spheres from early postnatal cochlear tissues and their expression of a wide range of developmental markers unique to hair cells confirm the possibility that self-supporting hair cell precursors exist in or can be derived from the postnatal mammalian cochlea...

Navigable nanotransport

...preorganized structures or "molds" to shape hollow spheres and most methods require a lengthy, tedious synthe...en be filled with guest molecules. The size of the spheres is very uniform and depends largely on the solvent in which the linking reaction takes place. The re...

McBride shows DNA detective work with paper-eating bacteria that 'glide'

...res involved in movement. Instead, he bonded latex spheres to the surface of F. johnsoniae cells and observed that they moved in all directions around the cell's perimeter. "The cell wall appears to have a series of moving conveyer belts," he says. He also has learned that some of the motility proteins (...

Sandia researchers discover way to see how a drug attaches to a cell

...y of producing porous, nanoscopic, hollow platinum spheres by using liposomes as blueprints. (Liposomes are m.... When the liposomes are broken up, the platinum spheres remain intact. The thickness of the platinum shell around the sphere can be controlled by reducing...

Engineer ramps up protein production, develops versatile viral spheres

...including production of versatile, nanoscale viral spheres that can act as delivery trucks for a new class of...originality and likely impact." Versatile viral spheres At the ACS session where Swartz receives the award he also will present one of the most recent in...

Microcapsules like it hot and salty

...l investigations, how the properties of the hollow spheres will change if the temperature and salt content ar...the temperature is only slightly raised the hollow spheres swell up or shrink and at the same time the wall becomes thinner or thicker. This depends on the com...

Scientists discover a genetic code for organizing DNA within the nucleus

... protein scaffolding in the cell nucleus into tiny spheres called nucleosomes. The bead-like nucleosomes are strung along the entire chromosome, which is itself folded and packaged to fit into the nucleus. What determines how, when and where a nucleosome will be positioned along the DNA sequence? Dr. Eran Se...

Cellular scale drug delivery from the inside out

...nanospheres that makes drug delivery possible. The spheres have thousands of parallel channels running completely through them. Through capillary action, the spheres can soak up molecules of the drug to be delivered. When the channels are filled, the ends of channel...

'Nanospheres' that block pain of sensitive teeth

...conference EMAG-NANO 2005 shows that creating tiny spheres of a ceramic material called hydroxyapatite could ...40nm in diameter. Earl said: "We found these tiny spheres are really good at filling the channels in teeth, packing inside them quite evenly and going down th...

Modifications render carbon nanotubes nontoxic

...e atom thick. They are related to buckyballs, tiny spheres of pure carbon that are about the same diameter. In previous studies with buckyballs, CBEN found that even minor surface modifications could dramatically reduce cytotoxicity. The nanotube study found similar results. In both cases, the researchers i...

'Gadonanotubes' greatly outperform existing MRI contrast agents

...gadolinium MRI contrast agents by encasing them in spheres of carbon called buckyballs," said lead author Lon Wilson, professor of chemistry at Rice. "Each nanotube will hold more gadolinium atoms than a buckyball, so we expected them to be more effective agents. But they are actually much, much better than ...

Self-assembled DNA buckyballs for drug delivery

...earchers have made DNA buckyballs -- tiny geodesic spheres that could be used for drug delivery and as contai...15 nm long. (While still on the nanoscale, the DNA spheres are much larger than carbon buckyballs, which are typically around 7 nm in diameter.) About 70 perc...

Probing the promise and perils of nanoparticles

...n studying nanoparticles known as dendrimers, tiny spheres whose width is ten thousands times smaller than the thickness of a human hair. Dendrimers have shown promise for precisely delivering drugs to their targets inside the body, but high concentrations of these nanoparticles can be toxic. In earlier work...

Probing The Promise And Perils Of Nanoparticles

...n studying nanoparticles known as dendrimers, tiny spheres whose width is ten thousands times smaller than the thickness of a human hair. Dendrimers have shown promise for precisely delivering drugs to their targets inside the body, but high concentrations of these nanoparticles can be toxic. In earlier work...

Taking Aim With Nanoparticle PEBBLEs

...ometers in diameter—about the size of a virus. The spheres carry an assortment of molecules on their surfaces, some to guide the PEBBLEs to their targets inside the body, some to enhance their visibility on MRI images, and others to deliver a deadly cargo to cancer cells when triggered by exposure to light. ...

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