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Daniel Pietschner

Bio: Daniel Pietschner is an academic researcher from Max Planck Society. The author has contributed to research in topics: Telescope & X-ray telescope. The author has an hindex of 12, co-authored 21 publications receiving 3305 citations.
Topics: Telescope, X-ray telescope, Halo orbit, Laser, ROSAT

Papers
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Journal ArticleDOI
Henry N. Chapman1, Petra Fromme2, Anton Barty, Thomas A. White, Richard A. Kirian2, Andrew Aquila, Mark S. Hunter2, Joachim Schulz, Daniel P. DePonte, Uwe Weierstall2, R. Bruce Doak2, Filipe R. N. C. Maia3, Andrew V. Martin, Ilme Schlichting4, Lukas Lomb4, Nicola Coppola5, Robert L. Shoeman4, Sascha W. Epp4, Robert Hartmann, Daniel Rolles4, Artem Rudenko4, Lutz Foucar4, Nils Kimmel4, Georg Weidenspointner4, Peter Holl, Mengning Liang, Miriam Barthelmess, Carl Caleman, Sébastien Boutet6, Michael J. Bogan6, Jacek Krzywinski6, Christoph Bostedt6, Saša Bajt, Lars Gumprecht, Benedikt Rudek4, Benjamin Erk4, Carlo Schmidt4, André Hömke4, Christian Reich, Daniel Pietschner4, Lothar Strüder4, Günter Hauser4, H. Gorke7, Joachim Ullrich4, Sven Herrmann4, Gerhard Schaller4, Florian Schopper4, Heike Soltau, Kai-Uwe Kühnel4, Marc Messerschmidt6, John D. Bozek6, Stefan P. Hau-Riege8, Matthias Frank8, Christina Y. Hampton6, Raymond G. Sierra6, Dmitri Starodub6, Garth J. Williams6, Janos Hajdu3, Nicusor Timneanu3, M. Marvin Seibert3, M. Marvin Seibert6, Jakob Andreasson3, Andrea Rocker3, Olof Jönsson3, Martin Svenda3, Stephan Stern, Karol Nass1, Robert Andritschke4, Claus Dieter Schröter4, Faton Krasniqi4, Mario Bott4, Kevin Schmidt2, Xiaoyu Wang2, Ingo Grotjohann2, James M. Holton9, Thomas R. M. Barends4, Richard Neutze10, Stefano Marchesini9, Raimund Fromme2, Sebastian Schorb11, Daniela Rupp11, M. Adolph11, Tais Gorkhover11, Inger Andersson12, Helmut Hirsemann, Guillaume Potdevin, Heinz Graafsma, Björn Nilsson, John C. H. Spence2 
03 Feb 2011-Nature
TL;DR: This work offers a new approach to structure determination of macromolecules that do not yield crystals of sufficient size for studies using conventional radiation sources or are particularly sensitive to radiation damage, by using pulses briefer than the timescale of most damage processes.
Abstract: X-ray crystallography provides the vast majority of macromolecular structures, but the success of the method relies on growing crystals of sufficient size. In conventional measurements, the necessary increase in X-ray dose to record data from crystals that are too small leads to extensive damage before a diffraction signal can be recorded(1-3). It is particularly challenging to obtain large, well-diffracting crystals of membrane proteins, for which fewer than 300 unique structures have been determined despite their importance in all living cells. Here we present a method for structure determination where single-crystal X-ray diffraction 'snapshots' are collected from a fully hydrated stream of nanocrystals using femtosecond pulses from a hard-X-ray free-electron laser, the Linac Coherent Light Source(4). We prove this concept with nanocrystals of photosystem I, one of the largest membrane protein complexes(5). More than 3,000,000 diffraction patterns were collected in this study, and a three-dimensional data set was assembled from individual photosystem I nanocrystals (similar to 200 nm to 2 mm in size). We mitigate the problem of radiation damage in crystallography by using pulses briefer than the timescale of most damage processes(6). This offers a new approach to structure determination of macromolecules that do not yield crystals of sufficient size for studies using conventional radiation sources or are particularly sensitive to radiation damage.

1,708 citations

Journal ArticleDOI
M. Marvin Seibert1, Tomas Ekeberg1, Filipe R. N. C. Maia1, Martin Svenda1, Jakob Andreasson1, Olof Jönsson1, Dusko Odic1, Bianca Iwan1, Andrea Rocker1, Daniel Westphal1, Max F. Hantke1, Daniel P. DePonte, Anton Barty, Joachim Schulz, Lars Gumprecht, Nicola Coppola, Andrew Aquila, Mengning Liang, Thomas A. White, Andrew V. Martin, Carl Caleman1, Stephan Stern2, Chantal Abergel3, Virginie Seltzer3, Jean-Michel Claverie3, Christoph Bostedt4, John D. Bozek4, Sébastien Boutet4, A. Miahnahri4, Marc Messerschmidt4, Jacek Krzywinski4, Garth J. Williams4, Keith O. Hodgson4, Michael J. Bogan4, Christina Y. Hampton4, Raymond G. Sierra4, D. Starodub4, Inger Andersson5, Sǎa Bajt, Miriam Barthelmess, John C. H. Spence6, Petra Fromme6, Uwe Weierstall6, Richard A. Kirian6, Mark S. Hunter6, R. Bruce Doak6, Stefano Marchesini7, Stefan P. Hau-Riege8, Matthias Frank8, Robert L. Shoeman9, Lukas Lomb9, Sascha W. Epp9, Robert Hartmann, Daniel Rolles9, Artem Rudenko9, Carlo Schmidt9, Lutz Foucar9, Nils Kimmel9, Peter Holl, Benedikt Rudek9, Benjamin Erk9, André Hömke9, Christian Reich, Daniel Pietschner9, Georg Weidenspointner9, Lothar Strüder9, Günter Hauser9, H. Gorke, Joachim Ullrich9, Ilme Schlichting9, Sven Herrmann9, Gerhard Schaller9, Florian Schopper9, Heike Soltau, Kai Uwe Kuhnel9, Robert Andritschke9, Claus Dieter Schröter9, Faton Krasniqi9, Mario Bott9, Sebastian Schorb10, Daniela Rupp10, M. Adolph10, Tais Gorkhover10, Helmut Hirsemann, Guillaume Potdevin, Heinz Graafsma, Björn Nilsson, Henry N. Chapman2, Janos Hajdu1 
03 Feb 2011-Nature
TL;DR: This work shows that high-quality diffraction data can be obtained with a single X-ray pulse from a non-crystalline biological sample, a single mimivirus particle, which was injected into the pulsed beam of a hard-X-ray free-electron laser, the Linac Coherent Light Source.
Abstract: The start-up of the Linac Coherent Light Source (LCLS), the new femtosecond hard X-ray laser facility in Stanford, California, has brought high expectations of a new era for biological imaging. The intense, ultrashort X-ray pulses allow diffraction imaging of small structures before radiation damage occurs. Two papers in this issue of Nature present proof-of-concept experiments showing the LCLS in action. Chapman et al. tackle structure determination from nanocrystals of macromolecules that cannot be grown in large crystals. They obtain more than three million diffraction patterns from a stream of nanocrystals of the membrane protein photosystem I, and assemble a three-dimensional data set for this protein. Seibert et al. obtain images of a non-crystalline biological sample, mimivirus, by injecting a beam of cooled mimivirus particles into the X-ray beam. 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. X-ray lasers offer new capabilities in understanding the structure of biological systems, complex materials and matter under extreme conditions1,2,3,4. Very short and extremely bright, coherent X-ray pulses can be used to outrun key damage processes and obtain a single diffraction pattern from a large macromolecule, a virus or a cell before the sample explodes and turns into plasma1. The continuous diffraction pattern of non-crystalline objects permits oversampling and direct phase retrieval2. Here we show that high-quality diffraction data can be obtained with a single X-ray pulse from a non-crystalline biological sample, a single mimivirus particle, which was injected into the pulsed beam of a hard-X-ray free-electron laser, the Linac Coherent Light Source5. Calculations indicate that the energy deposited into the virus by the pulse heated the particle to over 100,000 K after the pulse had left the sample. The reconstructed exit wavefront (image) yielded 32-nm full-period resolution in a single exposure and showed no measurable damage. The reconstruction indicates inhomogeneous arrangement of dense material inside the virion. We expect that significantly higher resolutions will be achieved in such experiments with shorter and brighter photon pulses focused to a smaller area. The resolution in such experiments can be further extended for samples available in multiple identical copies.

838 citations

Journal ArticleDOI
Peter Predehl1, Robert Andritschke1, V. Arefiev, V. Babyshkin, O. Batanov, Werner Becker1, Hans Böhringer1, A. V. Bogomolov, Th. Boller1, Katharina Borm2, Katharina Borm3, W. Bornemann1, Heinrich Bräuninger1, Marcus Brüggen4, Hermann Brunner1, Marcella Brusa5, Marcella Brusa6, Esra Bulbul1, M. Buntov, Vadim Burwitz1, Wolfgang Burkert1, N. Clerc7, E. Churazov1, D. Coutinho1, Thomas Dauser8, Konrad Dennerl1, Victor Doroshenko9, Josef Eder1, Valentin Emberger1, Tanja Eraerds1, Alexis Finoguenov1, Michael Freyberg1, Peter Friedrich1, S. Friedrich1, Maria Fürmetz1, Antonis Georgakakis, Marat Gilfanov1, S. Granato1, Christoph Grossberger1, A. Gueguen1, P. Gureev, Frank Haberl1, O. Hälker1, Gisela Hartner1, Guenther Hasinger, H. Huber1, Long Ji9, Andreas von Kienlin1, W. Kink1, F. Korotkov, Ingo Kreykenbohm8, Georg Lamer10, I. Lomakin, I. Lapshov, Tie Liu1, Chandreyee Maitra1, Norbert Meidinger1, B. Menz1, Andrea Merloni1, T. Mernik3, Benjamin Mican1, Joseph J. Mohr11, Sebastian Müller1, Kirpal Nandra1, V. Nazarov, Florian Pacaud2, M. N. Pavlinsky, Emanuele Perinati9, Elmar Pfeffermann1, Daniel Pietschner1, Miriam E. Ramos-Ceja1, Arne Rau1, Jonas Reiffers1, Thomas H. Reiprich2, Jan Robrade4, Mara Salvato1, Jeremy S. Sanders1, Andrea Santangelo9, Manami Sasaki8, H. Scheuerle3, Christian Schmid8, Jürgen H. M. M. Schmitt4, Axel Schwope10, A. Shirshakov, Matthias Steinmetz10, Ian M. Stewart1, Lothar Strüder1, Rashid Sunyaev1, C. Tenzer9, Lars Tiedemann1, Joachim Trümper1, V. Voron, P. Weber8, Joern Wilms8, Valeri Yaroshenko1 
Abstract: eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the primary instrument on the Spectrum-Roentgen-Gamma (SRG) mission, which was successfully launched on July 13, 2019, from the Baikonour cosmodrome. After the commissioning of the instrument and a subsequent calibration and performance verification phase, eROSITA started a survey of the entire sky on December 13, 2019. By the end of 2023, eight complete scans of the celestial sphere will have been performed, each lasting six months. At the end of this program, the eROSITA all-sky survey in the soft X-ray band (0.2–2.3 keV) will be about 25 times more sensitive than the ROSAT All-Sky Survey, while in the hard band (2.3–8 keV) it will provide the first ever true imaging survey of the sky. The eROSITA design driving science is the detection of large samples of galaxy clusters up to redshifts z > 1 in order to study the large-scale structure of the universe and test cosmological models including Dark Energy. In addition, eROSITA is expected to yield a sample of a few million AGNs, including obscured objects, revolutionizing our view of the evolution of supermassive black holes. The survey will also provide new insights into a wide range of astrophysical phenomena, including X-ray binaries, active stars, and diffuse emission within the Galaxy. Results from early observations, some of which are presented here, confirm that the performance of the instrument is able to fulfil its scientific promise. With this paper, we aim to give a concise description of the instrument, its performance as measured on ground, its operation in space, and also the first results from in-orbit measurements.

338 citations

Journal ArticleDOI
TL;DR: In this article, the Max Planck Advanced Study Group (ASG) within the Center for Free Electron Laser Science (CFEL) has designed the CFEL-ASG MultiPurpose (CAMP) chamber.
Abstract: Fourth generation accelerator-based light sources, such as VUV and X-ray Free Electron Lasers (FEL), deliver ultra-brilliant (∼1012–1013 photons per bunch) coherent radiation in femtosecond (∼10–100 fs) pulses and, thus, require novel focal plane instrumentation in order to fully exploit their unique capabilities. As an additional challenge for detection devices, existing (FLASH, Hamburg) and future FELs (LCLS, Menlo Park; SCSS, Hyogo and the European XFEL, Hamburg) cover a broad range of photon energies from the EUV to the X-ray regime with significantly different bandwidths and pulse structures reaching up to MHz micro-bunch repetition rates. Moreover, hundreds up to trillions of fragment particles, ions, electrons or scattered photons can emerge when a single light flash impinges on matter with intensities up to 1022 W/cm2. In order to meet these challenges, the Max Planck Advanced Study Group (ASG) within the Center for Free Electron Laser Science (CFEL) has designed the CFEL-ASG MultiPurpose (CAMP) chamber. It is equipped with specially developed photon and charged particle detection devices dedicated to cover large solid-angles. A variety of different targets are supported, such as atomic, (aligned) molecular and cluster jets, particle injectors for bio-samples or fixed target arrangements. CAMP houses 4π solid-angle ion and electron momentum imaging spectrometers (“reaction microscope”, REMI, or “velocity map imaging”, VMI) in a unique combination with novel, large-area, broadband (50 eV–25 keV), high-dynamic-range, single-photon-counting and imaging X-ray detectors based on the pnCCDs. This instrumentation allows a new class of coherent diffraction experiments in which both electron and ion emission from the target may be simultaneously monitored. This permits the investigation of dynamic processes in this new regime of ultra-intense, high-energy radiation—matter interaction. After an introduction into the salient features of the CAMP chamber and the properties of the redesigned REMI/VMI spectrometers, the new 1024×1024 pixel format pnCCD imaging detector system will be described in detail. Results of tests of four smaller format (256×512) devices of identical performance, conducted at FLASH and BESSY, will be presented and the concept as well as the anticipated properties of the full, large-scale system will be elucidated. The data obtained at both radiation sources illustrate the unprecedented performance of the X-ray detectors, which have a voxel size of 75×75×450 μm3 and a typical read-out noise of 2.5 electrons (rms) at an operating temperature of −50 °C.

305 citations

Journal ArticleDOI
TL;DR: The plasma dynamics of single mesoscopic Xe particles irradiated with intense femtosecond x-ray pulses exceeding 10(16) W/cm2 from the Linac Coherent Light Source free-electron laser are investigated and show that for clusters illuminated with intense x-Ray pulses, highly charged ionization fragments in a narrow distribution are created.
Abstract: The plasma dynamics of single mesoscopic Xe particles irradiated with intense femtosecond x-ray pulses exceeding ${10}^{16}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$ from the Linac Coherent Light Source free-electron laser are investigated. Simultaneous recording of diffraction patterns and ion spectra allows eliminating the influence of the laser focal volume intensity and particle size distribution. The data show that for clusters illuminated with intense x-ray pulses, highly charged ionization fragments in a narrow distribution are created and that the nanoplasma recombination is efficiently suppressed.

252 citations


Cited by
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Journal ArticleDOI
01 Oct 2019
TL;DR: Recent developments in the Phenix software package are described in the context of macromolecular structure determination using X-rays, neutrons and electrons.
Abstract: Diffraction (X-ray, neutron and electron) and electron cryo-microscopy are powerful methods to determine three-dimensional macromolecular structures, which are required to understand biological processes and to develop new therapeutics against diseases. The overall structure-solution workflow is similar for these techniques, but nuances exist because the properties of the reduced experimental data are different. Software tools for structure determination should therefore be tailored for each method. Phenix is a comprehensive software package for macromolecular structure determination that handles data from any of these techniques. Tasks performed with Phenix include data-quality assessment, map improvement, model building, the validation/rebuilding/refinement cycle and deposition. Each tool caters to the type of experimental data. The design of Phenix emphasizes the automation of procedures, where possible, to minimize repetitive and time-consuming manual tasks, while default parameters are chosen to encourage best practice. A graphical user interface provides access to many command-line features of Phenix and streamlines the transition between programs, project tracking and re-running of previous tasks.

3,268 citations

Journal ArticleDOI
TL;DR: This review extensively discusses the multifunctional bio-applications of AgNPs; for example, as antibacterial, antifungal, antiviral,Anti-inflammatory, anti-angiogenic, and anti-cancer agents, and the mechanism of the anti- cancer activity of Ag NPs.
Abstract: Recent advances in nanoscience and nanotechnology radically changed the way we diagnose, treat, and prevent various diseases in all aspects of human life. Silver nanoparticles (AgNPs) are one of the most vital and fascinating nanomaterials among several metallic nanoparticles that are involved in biomedical applications. AgNPs play an important role in nanoscience and nanotechnology, particularly in nanomedicine. Although several noble metals have been used for various purposes, AgNPs have been focused on potential applications in cancer diagnosis and therapy. In this review, we discuss the synthesis of AgNPs using physical, chemical, and biological methods. We also discuss the properties of AgNPs and methods for their characterization. More importantly, we extensively discuss the multifunctional bio-applications of AgNPs; for example, as antibacterial, antifungal, antiviral, anti-inflammatory, anti-angiogenic, and anti-cancer agents, and the mechanism of the anti-cancer activity of AgNPs. In addition, we discuss therapeutic approaches and challenges for cancer therapy using AgNPs. Finally, we conclude by discussing the future perspective of AgNPs.

1,720 citations

Journal ArticleDOI
Henry N. Chapman1, Petra Fromme2, Anton Barty, Thomas A. White, Richard A. Kirian2, Andrew Aquila, Mark S. Hunter2, Joachim Schulz, Daniel P. DePonte, Uwe Weierstall2, R. Bruce Doak2, Filipe R. N. C. Maia3, Andrew V. Martin, Ilme Schlichting4, Lukas Lomb4, Nicola Coppola5, Robert L. Shoeman4, Sascha W. Epp4, Robert Hartmann, Daniel Rolles4, Artem Rudenko4, Lutz Foucar4, Nils Kimmel4, Georg Weidenspointner4, Peter Holl, Mengning Liang, Miriam Barthelmess, Carl Caleman, Sébastien Boutet6, Michael J. Bogan6, Jacek Krzywinski6, Christoph Bostedt6, Saša Bajt, Lars Gumprecht, Benedikt Rudek4, Benjamin Erk4, Carlo Schmidt4, André Hömke4, Christian Reich, Daniel Pietschner4, Lothar Strüder4, Günter Hauser4, H. Gorke7, Joachim Ullrich4, Sven Herrmann4, Gerhard Schaller4, Florian Schopper4, Heike Soltau, Kai-Uwe Kühnel4, Marc Messerschmidt6, John D. Bozek6, Stefan P. Hau-Riege8, Matthias Frank8, Christina Y. Hampton6, Raymond G. Sierra6, Dmitri Starodub6, Garth J. Williams6, Janos Hajdu3, Nicusor Timneanu3, M. Marvin Seibert6, M. Marvin Seibert3, Jakob Andreasson3, Andrea Rocker3, Olof Jönsson3, Martin Svenda3, Stephan Stern, Karol Nass1, Robert Andritschke4, Claus Dieter Schröter4, Faton Krasniqi4, Mario Bott4, Kevin Schmidt2, Xiaoyu Wang2, Ingo Grotjohann2, James M. Holton9, Thomas R. M. Barends4, Richard Neutze10, Stefano Marchesini9, Raimund Fromme2, Sebastian Schorb11, Daniela Rupp11, M. Adolph11, Tais Gorkhover11, Inger Andersson12, Helmut Hirsemann, Guillaume Potdevin, Heinz Graafsma, Björn Nilsson, John C. H. Spence2 
03 Feb 2011-Nature
TL;DR: This work offers a new approach to structure determination of macromolecules that do not yield crystals of sufficient size for studies using conventional radiation sources or are particularly sensitive to radiation damage, by using pulses briefer than the timescale of most damage processes.
Abstract: X-ray crystallography provides the vast majority of macromolecular structures, but the success of the method relies on growing crystals of sufficient size. In conventional measurements, the necessary increase in X-ray dose to record data from crystals that are too small leads to extensive damage before a diffraction signal can be recorded(1-3). It is particularly challenging to obtain large, well-diffracting crystals of membrane proteins, for which fewer than 300 unique structures have been determined despite their importance in all living cells. Here we present a method for structure determination where single-crystal X-ray diffraction 'snapshots' are collected from a fully hydrated stream of nanocrystals using femtosecond pulses from a hard-X-ray free-electron laser, the Linac Coherent Light Source(4). We prove this concept with nanocrystals of photosystem I, one of the largest membrane protein complexes(5). More than 3,000,000 diffraction patterns were collected in this study, and a three-dimensional data set was assembled from individual photosystem I nanocrystals (similar to 200 nm to 2 mm in size). We mitigate the problem of radiation damage in crystallography by using pulses briefer than the timescale of most damage processes(6). This offers a new approach to structure determination of macromolecules that do not yield crystals of sufficient size for studies using conventional radiation sources or are particularly sensitive to radiation damage.

1,708 citations

Journal ArticleDOI
TL;DR: Providing a future energy supply that is secure and CO_2-neutral will require switching to nonfossil energy sources such as wind, solar, nuclear, and geothermal energy and developing methods for transforming the energy produced by these new sources into forms that can be stored, transported, and used upon demand.
Abstract: Two major energy-related problems confront the world in the next 50 years. First, increased worldwide competition for gradually depleting fossil fuel reserves (derived from past photosynthesis) will lead to higher costs, both monetarily and politically. Second, atmospheric CO_2 levels are at their highest recorded level since records began. Further increases are predicted to produce large and uncontrollable impacts on the world climate. These projected impacts extend beyond climate to ocean acidification, because the ocean is a major sink for atmospheric CO2.1 Providing a future energy supply that is secure and CO_2-neutral will require switching to nonfossil energy sources such as wind, solar, nuclear, and geothermal energy and developing methods for transforming the energy produced by these new sources into forms that can be stored, transported, and used upon demand.

1,651 citations

Journal ArticleDOI
Bela Abolfathi1, D. S. Aguado2, Gabriela Aguilar3, Carlos Allende Prieto2  +361 moreInstitutions (94)
TL;DR: SDSS-IV is the fourth generation of the Sloan Digital Sky Survey and has been in operation since 2014 July. as discussed by the authors describes the second data release from this phase, and the 14th from SDSS overall (making this Data Release Fourteen or DR14).
Abstract: The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since 2014 July. This paper describes the second data release from this phase, and the 14th from SDSS overall (making this Data Release Fourteen or DR14). This release makes the data taken by SDSS-IV in its first two years of operation (2014-2016 July) public. Like all previous SDSS releases, DR14 is cumulative, including the most recent reductions and calibrations of all data taken by SDSS since the first phase began operations in 2000. New in DR14 is the first public release of data from the extended Baryon Oscillation Spectroscopic Survey; the first data from the second phase of the Apache Point Observatory (APO) Galactic Evolution Experiment (APOGEE-2), including stellar parameter estimates from an innovative data-driven machine-learning algorithm known as "The Cannon"; and almost twice as many data cubes from the Mapping Nearby Galaxies at APO (MaNGA) survey as were in the previous release (N = 2812 in total). This paper describes the location and format of the publicly available data from the SDSS-IV surveys. We provide references to the important technical papers describing how these data have been taken (both targeting and observation details) and processed for scientific use. The SDSS web site (www.sdss.org) has been updated for this release and provides links to data downloads, as well as tutorials and examples of data use. SDSS-IV is planning to continue to collect astronomical data until 2020 and will be followed by SDSS-V.

965 citations