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Showing 1–19 of 19 results
Advanced filters: Author: Daniel F. Doak Clear advanced filters

  • Climate change is expected to shift the latitudinal and altitudinal ranges of species, but the low latitude or low altitude edge does not necessarily move as fast as the high edge. Here, demographic data on two tundra plants have been used to show that changed demographic rates at the lower edge are compensating for the warming climate, but that this effect will not last and a tipping point will be reached as temperatures get warmer.

    • Daniel F. Doak
    • William F. Morris
    Research
    Nature
    Volume: 467, P: 959-962

  • Lipidic sponge phase crystallization yields membrane protein microcrystals that can be injected into an X-ray free electron laser beam, yielding diffraction patterns that can be processed to recover the crystal structure.

    • Linda C Johansson
    • David Arnlund
    • Richard Neutze
    Research
    Nature Methods
    Volume: 9, P: 263-265

  • Researchers describe a mechanism capable of compressing fast and intense X-ray pulses through the rapid loss of crystalline periodicity. It is hoped that this concept, combined with X-ray free-electron laser technology, will allow scientists to obtain structural information at atomic resolutions.

    • Anton Barty
    • Carl Caleman
    • Henry N. Chapman
    Research
    Nature Photonics
    Volume: 6, P: 35-40

  • Serial femtosecond X-ray crystallography permits the use of very small protein crystals; however, a continuous flow of sample is required. Weierstall et al. design and demonstrate an injector system that can supply microcrystals in the lipidic cubic phase, dramatically reducing the quantities of protein required.

    • Uwe Weierstall
    • Daniel James
    • Vadim Cherezov
    Research
    Nature Communications
    Volume: 5, P: 1-6

  • Intraspecies response to climate change is expected to align with genetic affinity. Using the American pika as a case study suggests that divisions of species distributions best explain intraspecific heterogeneity in climate relationships.

    • Adam B. Smith
    • Erik A. Beever
    • Leah Yandow
    Research
    Nature Climate Change
    Volume: 9, P: 787-794

  • The start-up of the new femtosecond hard X-ray laser facility in Stanford, the Linac Coherent Light Source, has brought high expectations for a new era for biological imaging. The intense, ultrashort X-ray pulses allow diffraction imaging of small structures before radiation damage occurs. This new capability is tested for the problem of imaging a non-crystalline biological sample. Images of mimivirus are obtained, the largest known virus with a total diameter of about 0.75 micrometres, by injecting a beam of cooled mimivirus particles into the X-ray beam. The measurements indicate no damage during imaging and prove the concept of this imaging technique.

    • M. Marvin Seibert
    • Tomas Ekeberg
    • Janos Hajdu
    Research
    Nature
    Volume: 470, P: 78-81

  • Serial femtosecond crystallography is an X-ray free-electron-laser-based method that uses X-ray bursts to determine protein structures. Here the authors present the structure of a photosynthetic reaction centre, an integral membrane protein, achieved with no sign of X-ray-induced radiation damage.

    • Linda C. Johansson
    • David Arnlund
    • Richard Neutze
    ResearchOpen Access
    Nature Communications
    Volume: 4, P: 1-7

  • The start-up of the new femtosecond hard X-ray laser facility in Stanford, the Linac Coherent Light Source, has brought high expectations for a new era for biological imaging. The intense, ultrashort X-ray pulses allow diffraction imaging of small structures before radiation damage occurs. This new capability is tested for the problem of structure determination from nanocrystals of macromolecules that cannot be grown in large crystals. Over three million diffraction patterns were collected from a stream of nanocrystals of the membrane protein complex photosystem I, which allowed the assembly of a three-dimensional data set for this protein, and proves the concept of this imaging technique.

    • Henry N. Chapman
    • Petra Fromme
    • John C. H. Spence
    Research
    Nature
    Volume: 470, P: 73-77

  • The new European X-Ray Free-Electron Laser (EuXFEL) is the first XFEL that generates X-ray pulses with a megahertz inter-pulse spacing. Here the authors demonstrate that high-quality and damage-free protein structures can be obtained with the currently available 1.1 MHz repetition rate pulses using lysozyme as a test case and furthermore present a β-lactamase structure.

    • Max O. Wiedorn
    • Dominik Oberthür
    • Anton Barty
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-11

  • The structure of the bacterial toxin BinAB, which is used to combat mosquito-borne diseases, reveals pH-sensitive switches and carbohydrate-binding modules that may contribute to the larvicidal function of the toxin.

    • Jacques-Philippe Colletier
    • Michael R. Sawaya
    • David S. Eisenberg
    Research
    Nature
    Volume: 539, P: 43-47

  • There is a growing interest in performing time-resolved cryo-EM studies. Here, the authors present a time-resolved sample preparation method for cryo-EM called trEM, which uses a microfluidic device to initiate the biochemical reaction by rapid mixing of the components and then spraying the sample onto a cryo-EM grid to snap-freeze it in a blot-free, automated manner within several milliseconds.

    • Märt-Erik Mäeots
    • Byungjin Lee
    • Radoslav I. Enchev
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-14

  • Femtosecond X-ray pulses were used to obtain diffraction data on photosystem II, revealing conformational changes as the complex transitions from the dark S1 state to the double-pumped S3 state; the time-resolved serial femtosecond crystallography technique enables structural determination of protein conformations that are highly prone to traditional radiation damage.

    • Christopher Kupitz
    • Shibom Basu
    • Petra Fromme
    Research
    Nature
    Volume: 513, P: 261-265

  • Type I natural killer T cells are characterized by an invariant Vα14-Jα18 T cell antigen receptor α-chain. Godfrey and colleagues describe a population of CD1d-restricted natural killer T cells that express a previously unidentified canonical Vα10-Jα50 α-chain.

    • Adam P Uldrich
    • Onisha Patel
    • Dale I Godfrey
    Research
    Nature Immunology
    Volume: 12, P: 616-623