Science

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Hubble Revisits a Globular Cluster’s Age

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http://www.nasa.gov/content/goddard/hubble-revisits-a-globular-cluster-s...

內湖 2021 陳鵬程

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Tall Boulder Rolls Down Martian Hill, Lands Upright

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Watching the Winds Where Sea Meets Sky

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The SeaWinds scatterometer on NASA's QuikScat satellite stares into the eye of 1999's Hurricane Floyd as it hits the U.S. coast. The arrows indicate wind direction, while the colors represent wind speed, with orange and yellow being the fastest.

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NASA's Chandra Observatory Searches for Trigger of Nearby Supernova

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New test reveals purity of graphene: Rice, Osaka scientists use terahertz waves to spot contaminants

Graphene may be tough, but those who handle it had better be tender. The environment surrounding the atom-thick carbon material can influence its electronic performance, according to researchers at Rice and Osaka universities who have come up with a simple way to spot contaminants.

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Rice and Osaka researchers have come up with a simple method to find contaminants on atom-thick graphene. By putting graphene on a layer of indium phosphide, which emits terahertz waves when excited by a laser pulse, they can measure and map changes in its electrical conductivity.

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Eco-friendly 'pre-fab nanoparticles' could revolutionize nano manufacturing: UMass Amherst team invents a way to create versatile, water-soluble nano-modules

A team of materials chemists, polymer scientists, device physicists and others at the University of Massachusetts Amherst today report a breakthrough technique for controlling molecular assembly of nanoparticles over multiple length scales that should allow faster, cheaper, more ecologically friendly manufacture of organic photovoltaics and other electronic devices.

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Postdoctoral research associate Monojit Bag (left) and graduate student Tim Gehan (right) synthesize polymer nanoparticles for use in organic-based solar cells being made at the University of Massachusetts Amherst-based energy center. Deep purple nanoparticles are forming in the small glass container above Gehan's left hand.

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New material could enhance fast and accurate DNA sequencing

Gene-based personalized medicine has many possibilities for diagnosis and targeted therapy, but one big bottleneck: the expensive and time-consuming DNA-sequencing process.

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A DNA molecule passes through a nanopore in a sheet of molybdenum disulfide, a material that researchers have found to be better than graphene at reading the DNA sequence.

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Non-Enzyme Nanosensors Quickly Measure Blood Sugar

Results of the research can meet the needs of hospitals and diagnosis laboratories to a cheap, quick and accurate sensor for the measurement of blood sugar in patients.

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Focal blood-brain-barrier disruption with high-frequency pulsed electric fields

Two, minimally invasive needle electrodes with 1 mm active length were spaced 4.0 mm apart and inserted into the right cerebral hemisphere 1.5 mm beneath the surface of the dura. A burst of 200, 500 ns duration square pulses of alternating polarity with a voltage-to-distance ratio of 250 V/cm were applied through the electrodes. In the case shown above, bursts were repeated once per second for 10 min. The extent of BBB disruption is shown by the dotted line surrounding Evans blue-albumin complex uptake on the gross brain slice preparation (left) and the corresponding fluorescent image (middle). Additionally, areas of BBB disruption appear as hyperintense (white) on the T1-weighted MRI exam, due to the uptake of a gadolinium-Evans blue tracer. Scale bar represents 5 mm.

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Pathologic and MRI evidence of blood-brain-barrier (BBB) disruption induced by the VEIN (Vascular Enabled Integrated Nanosecond) pulse generation system.

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Non-Enzyme Nanosensors Quickly Measure Blood Sugar

Iranian researchers from Isfahan University of Technology designed a new non-enzyme nanosensor that has applications in the measurement of blood glucose.

Results of the research can meet the needs of hospitals and diagnosis laboratories to a cheap, quick and accurate sensor for the measurement of blood sugar in patients.

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