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Tag: "width" at biology news

Probing The Promise And Perils Of Nanoparticles

...oparticles 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, U-M resear...

Open microfluidic and nanofluidic systems

... to channels with a rectangular cross section. The width and depth of these channels can be varied between ...s, a water filament in a narrow channel that has a width of 100 nanometer can sustain an overpressure up to 15 atm. In contrast, if the channel had a width o...

Breakthrough method in nanoparticle synthesis paves the way for new pharmaceutical and biomedical applications

...th tunable pore sizes in the range of 5-30 nm (The width of a human hair is approximately 80,000 nm). “The nanoporous nanoparticles are named after our Institute, termed ‘IBN-1?to ‘IBN-5? They represent a new class of materials that are tailored simultaneously with nanometer-scale particle size and nanome...

Molecular Motors Cooperate In Moving Cellular Cargo, Study Shows

...of a meter, or about 10,000 times smaller than the width of a human hair). Recent improvements to FIONA now allow scientists to detect motion with millisecond time resolution. Selvin's team used FIONA to track fluorescently labeled peroxisomes (organelles that break down toxic substances) inside specially...

Probing the promise and perils of nanoparticles

...oparticles 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, U-M resear...

Bioelectronic ‘signatures?hold key to DNA mutations

... at the scale of a thousand times smaller than the width of a human hair. He wrote 660 papers and has 12 patents to his credit, including involvement in the development of the first noninvasive biosensor for diabetes, the FDA approved Gluco Watch, which monitors glucose levels through human sweat. “The ul...

Researchers Discover That Microbes Can Produce Miniature Electrical Wires

...owires are incredibly fine, only 3-5 nanometers in width (20,000 times finer than a human hair), but quite durable and more than a thousand times long as they are wide. “Such long, thin conductive structures are unprecedented in biology,?said Lovley. “This completely changes our concept of how microorgani...

Gap-climbing fruit flies reveal components of goal-driven behaviors

...ound that the flies first visually measure the gap width and then only cross the gap if it is a traversable width. If the chasm is short, flies engage in an extraordinary crossing behavior that the researchers showed involve three motor programs. High-speed video analyses revealed that flies can flexibly c...

'Underground' tunnels discovered as means for communication between immune system cells

...00 nanometers across - 5000 times smaller than the width of a human hair - and at any given time, cells may have up to 75 of these extensions, each of varying lengths. "Considering their scale, these nanotubules are allowing communication between fairly distant cells. If instead of a culture dish we were ...

New law for resolution allows unprecedented sharpness in fluorescence microscopy

...ad been previously dyed with a fluorescent dye) of width as small as 40-80 nm, a size previously reserved for electron microscopy. This may be of importance for the lithographic manufacturing of microchips. The reduction in size of the diameter of the effective fluorescence focus also has fundamental impl...

Purdue's gold nanorods brighten future for medical imaging

...ld rods with a certain "aspect ratio" of length to width shine brightly when illuminated by light in this spectral region. The gold nanorods are ideal for a type of imaging called "two-photon fluorescence," which provides higher contrast and brighter images than conventional fluorescent imaging methods. P...

Scientists develop nanotech-laser treatment that kills cancer cells without harming healthy tissue

...n nanotubes, synthetic rods that are only half the width of a DNA molecule. Thousands of nanotubes could easily fit inside a typical cell. "An interesting property of carbon nanotubes is that they absorb near-infrared light waves, which are slightly longer than visible rays of light and pass harmlessly th...

Polymer gel can block toxic leakage problem in gene therapy

... the needle's diameter is 30 times larger than the width of the microvessels that supply the tumor with blood. The needle is also wider than the spaces between each of those vessels, he added. The first author of the British Journal of Cancer study was Yuan's graduate student Yong Wang. Other authors incl...

Carbon nanotubes that detect disease-causing mutations developed by Pitt researcher

...s of graphite only a few nanometers wide-about the width of a molecule of DNA. The researchers used these nanotubes' electrical properties to find a particular mutation in the gene that causes hereditary hemochromatosis, a disease in which too much iron accumulates in body tissues. "The size compatibility...

A new focus for the mechanism of nerve growth

...ly, growth cones of nerve cells rapidly doubled in width when myosin II was blocked by blebbistatin," said Forscher. "FSM see that this was caused by inefficient recycling of actin filaments at the back end of the actin network treadmill." Recycling of actin bundles at the ends of structures called filop...

Penguins waddle but they don't fall down, UH researchers say

...across the mat, it measures the variability in the width and length of their steps. The data will provide insight into the natural mechanics and stability of the penguins' walking patterns. Kurz is collaborating with biologists at Moody Gardens, a public, nonprofit educational destination utilizing nat...

How plants avoid feeling the burn

...eter thick, or about 10,000 times smaller than the width of a human hair. One measurement problem is that carotenoids are highly prone to react with water and oxygen, so all measurements had to be performed in an environment that would both protect the molecule and immerse it in an environment mimicking ...

Magnetism and mimicry of nature hold hope for better medicine, environmental safety

...atoms in diameter and less than a hundredth of the width of a human hair in length. "We knew we had the perfect surface on which to analyze drops of blood and other biological fluids because the trapped air between the wires never allows for much of the fluid to come into contact with the surface," Garci...

Connect the Quantum Dots

...ion quantum dots would be needed to fit within the width of a thumb. By virtue of their distinct colors, quantum dots have quickly found their way into homes in many electronic lasers including the new PlayStation 3 and high-definition DVD players. Nanotechnology, the understanding and control of matter ...

When it comes to gene transcription, random pauses aren’t quite so random, study finds

...ents are accurate to one-tenth of a nanometer--the width of a single hydrogen atom," Block explained. "When you study an RNAP enzyme at that scale, you discover that it moves along the DNA for a while, and then for no apparent reason it appears to stop. Some pauses we've already figured out. The really lon...

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