Featured
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Research Highlights |
Nanobiotechnology: Tiny cell transistor
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Research Highlights |
Nanobiotechnology: More light on algae
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Research Highlights |
Nanoscience: Polymerization to order
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Letter |
Measuring mechanical tension across vinculin reveals regulation of focal adhesion dynamics
The ability of cells to respond to physical forces is central to development and physiology, but until now it has been difficult to directly measure forces across proteins in vivo. Here, however, a calibrated biosensor is described that can measure forces with high sensitivity across specific proteins in cells. This is applied to the vinculin protein, and a regulatory mechanism is revealed in which the force applied to vinculin determines whether focal adhesions assemble or disassemble.
- Carsten Grashoff
- , Brenton D. Hoffman
- & Martin A. Schwartz
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News & Views |
Sensing tension
Measuring the tension forces at specific sites in living cells is technically challenging. Now, a fluorescent biosensor protein can be used to characterize dynamic local changes in tension in migrating cells.
- Andrew D. Doyle
- & Kenneth M. Yamada
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Letter |
Tailoring light–matter–spin interactions in colloidal hetero-nanostructures
Light–matter interactions in semiconductors hold great promise for numerous applications, but as device size is reduced such interactions typically weaken, potentially posing problems for applications at the nanoscale. Here the authors circumvent these limitations by producing colloidal particles with metallic cores and semiconducting shells, in which coupling of the plasmons in the metal to the excitons in the semiconductor is engineered to enhance light–matter interactions in the particle.
- Jiatao Zhang
- , Yun Tang
- & Min Ouyang
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Research Highlights |
Nanoscience: Shifted shells
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Research Highlights |
Nanotechnology: Bacterial power
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Letter |
A proximity-based programmable DNA nanoscale assembly line
Many new functional materials and devices could be made if it were possible to rationally combine nanometre-scale particles into larger structures. An assembly line operating on the nanometre scale has now been demonstrated. It uses a DNA origami tile as a framework and track for the assembly process, three distinct DNA machines attached to the tile as programmable cargo-donating devices, and a DNA walker to generate the target product by moving along the track and collecting cargo from those devices that are switched on.
- Hongzhou Gu
- , Jie Chao
- & Nadrian C. Seeman
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Research Highlights |
Nanoelectronics: Protein transistor
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Letter |
Substrate-enhanced supercooling in AuSi eutectic droplets
Supercooling is a phenomenon by which a liquid remains in its fluid phase well below its melting point. Supercooling can be inhibited by the presence of a solid surface, whereby crystalline surfaces cause adjacent atoms in the liquid to become ordered, inducing crystal nucleation of the melt. Here it is shown that a particular surface ordering of gold atoms on top of a silicon substrate can stabilize the liquid phase of a gold-silicon eutectic droplet, and thus enhance supercooling.
- T. U. Schülli
- , R. Daudin
- & A. Pasturel
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News |
Cancer genes silenced in humans
Tiny particles carrying short strands of RNA can interfere with protein production in tumours.
- Janet Fang
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Letter |
Evidence of RNAi in humans from systemically administered siRNA via targeted nanoparticles
It has previously been shown in mice and non-human primates that systemically delivered short RNA molecules can inhibit gene expression. Here it is shown that a short interfering RNA (siRNA) can be systemically delivered, using nanoparticles, to a solid tumour in humans. The siRNA mediates cleavage of its target mRNA, thereby also reducing levels of the encoded protein. This proof-of-principle study confirms the potential of this technology for treating human disease.
- Mark E. Davis
- , Jonathan E. Zuckerman
- & Antoni Ribas
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Letter |
Shell-isolated nanoparticle-enhanced Raman spectroscopy
Surface-enhanced Raman scattering is a powerful spectroscopy technique that can be used to study substances down to the level of single molecules. But the practical applications have been limited by the need for metal substrates with roughened surfaces or in the form of nanoparticles. Here a new approach — shell-insulated nanoparticle-enhanced Raman spectroscopy — is described, and its versatility demonstrated with numerous test substances.
- Jian Feng Li
- , Yi Fan Huang
- & Zhong Qun Tian
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News & Views |
Expanding versatility
Gold nanoparticles coated with a thin layer of an oxide allow molecules adsorbed on surfaces as diverse as those of platinum, yeast cells or citrus fruits to be characterized routinely in the laboratory.
- Martin Moskovits
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Research Highlights |
Biomaterials: Squishy particles
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Research Highlights |
Nanotechnology: Light DNA machine
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News |
Underwater robot automates ocean testing
'Lab in a can' eliminates the middleman between sample site and lab.
- Richard A. Lovett