New families of protein structures, barrel proteins for positioning small molecules, self-assembling protein arrays, and precision sculpting of protein architectures highlight de novo protein design advances.
Archive for the 'Nano' Category
Computational design of proteins satisfying predetermined geometric constraints produced stable proteins with the designed structure that are not found in nature.
A fully automated design protocol generates dozens of designs for proteins based on helix-loop-helix-loop repeat units that are very stable, have crystal structures that match the design, have very different overall shapes, and are unrelated to any natural protein.
Prof. William Goddard presented four advances from his research group that enable going from first principles quantum mechanics calculations to realistic nanosystems of interest with millions or billions of atoms.
Prof. Gerhard Klimeck described the success of nanoHUB.org, a science and engineering gateway providing online simulations through a web browser for nanotechnology research and education.
A molecular robotic arm synthesized from small synthetic organic molecules uses cyclic changes in pH and other reaction conditions to grab and release a cargo molecule, and swing the cargo back and forth between the two ends of the molecular platform.
The positions of 3769 tungsten atoms in a tungsten needle segment were determined to a precision of 19 pm (0.019 nm), including the position of a single atom defect in the interior of the sample, by using aberration-corrected scanning transmission electron microscopy and computerized tomography.
In the first mouse model of the progressive form of multiple sclerosis, nanoparticles that created immune tolerance to myelin prevented the development of progressive MS.
Highly correlated electron motions resembling electron liquids rather than electron gases, and found in some transition metal oxides, may enable inexpensive substitution for expensive displays.
Electrochemically modifying individual metallic nanoparticles and pairs of such nanoparticles enabled reversible tuning of their optical properties, including charge transfer plasmon formation in nanoparticle pairs.
Coating micrometer-sized glass spheres with hundreds of DNA strands complementary to an RNA covering a glass slide enables the sphere to move, with the help of an enzyme that digests RNA bound to complementary DNA, a thousand times faster than conventional DNA-walkers.
Eight-armed nanoparticles of gold coated with a gold-palladium alloy proved to be both efficient plasmonic sensors and efficient catalysts, even though gold alone is not normally a good catalyst and palladium is a poor plasmonic material.
Two microRNAs with synergistic effects, one that suppresses tumor growth and another than inhibits tumor promotion, are combined in an RNA triple helix, complexed with a dendrimer to form nanoparticles, which are incorporated with a polymer to form a hydrogel that inhibits tumor growth when applied to the tumor.
A nanotechnology-based sensor provides fast, inexpensive, ultrasensitive assay of microRNA pattern to detect cancer using DNA immobilized on a synthetic gold nanoprism.
German researchers have used scaffolded DNA origami to adjust the angle of a DNA hinge joint by altering the length of special “adjuster helices”, causing molecules attached to the sides of the hinge to be displaced by as little as 0.04 nm.
Each time a laser pulse actuates the cis-trans isomerization of a single carbon-carbon double bond, a single-molecule nanosubmarine made of 244 atoms is driven forward 9 nm against Brownian diffusion.
Nanometer-level control of the beam path of a scanning transmission electron microscope nudges an amorphous material into atomically precise epitaxial growth.
Single cobalt atoms have been positioned in nitrogen-doped graphene to catalytically produce hydrogen from water almost as effectively as using vastly more expensive platinum catalysts.
Building on previous work on single atom transistors and single atom qubits, Australian researchers have incorporated a quantum error correction code to make possible a scalable 3D silicon chip architecture that could lead to operational quantum computers.
Independent rotation of two wheels attached to either end of an axle has been achieved in a light-driven artificial molecular motor, suggesting a basis for a nanometer-scale transport system.