Volume 17 Issue 5, May 2018

Volume 17 Issue 5

Gas-filled MRI contrast agents

Gas-filled vesicles derived from photosynthetic microbes are shown to elicit magnetic resonance imaging contrast in vitro and in vivo with the potential for acoustically modulated multiplexing and molecular sensing.

See Lu et al. and News & Views by Bulte

Image: Image by Barth van Rossum for Caltech. Cover Design: David Shand.

Editorial

  • Editorial |

    Whether you like exploring the mysteries of light–matter interactions, playing with a versatile chemical platform, or developing the most efficient devices, metal halide perovskites could be the materials for you.

Comment

Feature

News & Views

  • News & Views |

    Using a thin-film geometry and electric-field-driven enhancement of pyroelectric response, a relaxor ferroelectric is shown to display superior power densities for thermal harvesting.

    • Joseph P. Feser
    •  & Jayakanth Ravichandran
  • News & Views |

    Microbial gas vesicles have been developed for use as MRI contrast agents whose contrast can be inactivated by applying ultrasound waves to collapse the vesicles.

    • Jeff W. M. Bulte
  • News & Views |

    Unlike conventional inorganic semiconductors, which are typically brittle, α-Ag2S exhibits room-temperature ductility with favourable electrical properties, offering promise for use in high-performance flexible and stretchable devices.

    • Dae-Hyeong Kim
    •  & Gi Doo Cha
  • News & Views |

    Voltage control of recently discovered two-dimensional magnets has been demonstrated, highlighting their potential for low-power data storage.

    • Ajit Srivastava

Review Articles

Letters

  • Letter |

    Measurements of the chemical potential in a monolayer of WSe2 using a single electron transistor sensing scheme allows for the exact mapping of the level spacing of Landau levels of monolayer WSe2 in the conductance and valence bands.

    • Martin V. Gustafsson
    • , Matthew Yankowitz
    • , Carlos Forsythe
    • , Daniel Rhodes
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , James Hone
    • , Xiaoyang Zhu
    •  & Cory R. Dean
  • Letter |

    Pump–probe, time-resolved ARPES experiments with underdoped cuprates reveal the transient enhancement of the density of phase fluctuations, eventually leading to the collapse of superconductivity.

    • F. Boschini
    • , E. H. da Silva Neto
    • , E. Razzoli
    • , M. Zonno
    • , S. Peli
    • , R. P. Day
    • , M. Michiardi
    • , M. Schneider
    • , B. Zwartsenberg
    • , P. Nigge
    • , R. D. Zhong
    • , J. Schneeloch
    • , G. D. Gu
    • , S. Zhdanovich
    • , A. K. Mills
    • , G. Levy
    • , D. J. Jones
    • , C. Giannetti
    •  & A. Damascelli

Articles

  • Article |

    Inorganic α-Ag2S semiconductor, which has preferential slip planes in the crystal structure and irregularly distributed bonds of silver atoms preventing cleavage, demonstrates metal-like ductility at room temperature.

    • Xun Shi
    • , Hongyi Chen
    • , Feng Hao
    • , Ruiheng Liu
    • , Tuo Wang
    • , Pengfei Qiu
    • , Ulrich Burkhardt
    • , Yuri Grin
    •  & Lidong Chen
  • Article |

    Electrostrain, an important value for actuators, larger than 1% is only achieved in single crystals. Here, a pseudo-ternary polycrystalline ferroelectric with spontaneous lattice strain has 1.3% electrostrain, which may enable cheaper piezoelectrics.

    • Bastola Narayan
    • , Jaskaran Singh Malhotra
    • , Rishikesh Pandey
    • , Krishna Yaddanapudi
    • , Pavan Nukala
    • , Brahim Dkhil
    • , Anatoliy Senyshyn
    •  & Rajeev Ranjan
  • Article |

    The doping efficiency of n-type molecular dopants in organic semiconductors is shown to depend on the energy difference between the electron affinity of the host and the ionization potential of the doped system.

    • Christopher Gaul
    • , Sebastian Hutsch
    • , Martin Schwarze
    • , Karl Sebastian Schellhammer
    • , Fabio Bussolotti
    • , Satoshi Kera
    • , Gianaurelio Cuniberti
    • , Karl Leo
    •  & Frank Ortmann
  • Article |

    Angle-resolved photoemission spectroscopy with nanometre spatial resolution and low-energy electron microscopy/diffraction reveal that interaction with the Cu substrate can induce up to 7.5% lattice expansion in graphene adlayers.

    • Chaoyu Chen
    • , José Avila
    • , Hakim Arezki
    • , Van Luan Nguyen
    • , Jiahong Shen
    • , Marcin Mucha-Kruczyński
    • , Fei Yao
    • , Mohamed Boutchich
    • , Yue Chen
    • , Young Hee Lee
    •  & Maria C. Asensio
  • Article |

    Gas-filled vesicles derived from photosynthetic microbes are shown to elicit magnetic resonance imaging contrast in vitro and in vivo with the potential for acoustically modulated multiplexing and molecular sensing.

    • George J. Lu
    • , Arash Farhadi
    • , Jerzy O. Szablowski
    • , Audrey Lee-Gosselin
    • , Samuel R. Barnes
    • , Anupama Lakshmanan
    • , Raymond W. Bourdeau
    •  & Mikhail G. Shapiro