![European Monitoring Centre for Drugs and Drug Addiction [nové okno]](/design/plain/images/left_top_menu/emcdda.gif)
![Rada vlády pro koordinaci protidrogové politiky [nové okno]](/design/plain/images/left_top_menu/rvkpp.gif)
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License.
drogy-info.cz / Novinky odjinud / Science: Current Issue
Science: Current Issue
[Report] Meiosis-Specific Noncoding RNA Mediates Robust Pairing of Homologous Chromosomes in Meiosis
An RNA transcript helps to bring together homologous chromosomes during cell division.Authors: Da-Qiao Ding, Kasumi Okamasa, Miho Yamane, Chihiro Tsutsumi, Tokuko Haraguchi, Masayuki Yamamoto, Yasushi Hiraoka
[Report] Structural Basis for DNA Damage–Dependent Poly(ADP-ribosyl)ation by Human PARP-1
An enzyme that binds to damaged DNA undergoes a structural reorganization that enhances its catalytic activity.Authors: Marie-France Langelier, Jamie L. Planck, Swati Roy, John M. Pascal
[Report] Mechanical Control of Morphogenesis by Fat/Dachsous/Four-Jointed Planar Cell Polarity Pathway
Polarized proto-cadherin and myosin induce an anisotropic tension at cell junctions and thereby shape epithelial tissue.Authors: Floris Bosveld, Isabelle Bonnet, Boris Guirao, Sham Tlili, Zhimin Wang, Ambre Petitalot, Raphaël Marchand, Pierre-Luc Bardet, Philippe Marcq, François Graner, Yohanns Bellaïche
[Report] Differential Diffusivity of Nodal and Lefty Underlies a Reaction-Diffusion Patterning System
The inhibitor Lefty diffuses more widely than the activator Nodal.Authors: Patrick Müller, Katherine W. Rogers, Ben M. Jordan, Joon S. Lee, Drew Robson, Sharad Ramanathan, Alexander F. Schier
[Report] A Stem Cell–Based Approach to Cartilage Repair
A chemical screen using mesenchymal stem cells identifies a small molecule, kartogenin, that can promote chondrogenesis.Authors: Kristen Johnson, Shoutian Zhu, Matthew S. Tremblay, Joshua N. Payette, Jianing Wang, Laure C. Bouchez, Shelly Meeusen, Alana Althage, Charles Y. Cho, Xu Wu, Peter G. Schultz
[Report] Ancient Maya Astronomical Tables from Xultun, Guatemala
Wall paintings in a Mayan temple dating to the 9th century C.E. show calculations of Moon and, perhaps, planetary motion.Authors: William A. Saturno, David Stuart, Anthony F. Aveni, Franco Rossi
[Report] Carbon Isotope Constraints on the Deglacial CO2 Rise from Ice Cores
The stable isotopic composition of the carbon in carbon dioxide over the last 24,000 years illuminates past carbon cycle behavior.Authors: Jochen Schmitt, Robert Schneider, Joachim Elsig, Daiana Leuenberger, Anna Lourantou, Jérôme Chappellaz, Peter Köhler, Fortunat Joos, Thomas F. Stocker, Markus Leuenberger, Hubertus Fischer
[Report] Under the Hood of the Earthquake Machine: Toward Predictive Modeling of the Seismic Cycle
Computational models predict the long-term recurrence of earthquakes along a segment of the San Andreas Fault.Authors: Sylvain Barbot, Nadia Lapusta, Jean-Philippe Avouac
[Report] Coupling Quantum Tunneling with Cavity Photons
Optical coupling is used to control the tunneling of electrons between a pair of quantum wells.Authors: Peter Cristofolini, Gabriel Christmann, Simeon I. Tsintzos, George Deligeorgis, George Konstantinidis, Zacharias Hatzopoulos, Pavlos G. Savvidis, Jeremy J. Baumberg
[Report] Color and Albedo Heterogeneity of Vesta from Dawn
Spacecraft data provide a detailed characterization of the second most massive asteroid in the solar system.Authors: Vishnu Reddy, Andreas Nathues, Lucille Le Corre, Holger Sierks, Jian-Yang Li, Robert Gaskell, Timothy McCoy, Andrew W. Beck, Stefan E. Schröder, Carle M. Pieters, Kris J. Becker, Bonnie J. Buratti, Brett Denevi, David T. Blewett, Ulrich Christensen, Michael J. Gaffey, Pablo Gutierrez-Marques, Michael Hicks, Horst Uwe Keller, Thorsten Maue, Stefano Mottola, Lucy A. McFadden, Harry Y. McSween, David Mittlefehldt, David P. O’Brien, Carol Raymond, Christopher Russell
[Report] Spectroscopic Characterization of Mineralogy and Its Diversity Across Vesta
Spacecraft data provide a detailed characterization of the second most massive asteroid in the solar system.Authors: M. C. De Sanctis, E. Ammannito, M. T. Capria, F. Tosi, F. Capaccioni, F. Zambon, F. Carraro, S. Fonte, A. Frigeri, R. Jaumann, G. Magni, S. Marchi, T. B. McCord, L. A. McFadden, H. Y. McSween, D. W. Mittlefehldt, A. Nathues, E. Palomba, C. M. Pieters, C. A. Raymond, C. T. Russell, M. J. Toplis, D. Turrini
[Report] The Geologically Recent Giant Impact Basins at Vesta’s South Pole
Spacecraft data provide a detailed characterization of the second most massive asteroid in the solar system.Authors: Paul Schenk, David P. O’Brien, Simone Marchi, Robert Gaskell, Frank Preusker, Thomas Roatsch, Ralf Jaumann, Debra Buczkowski, Thomas McCord, Harry Y. McSween, David Williams, Aileen Yingst, Carol Raymond, Chris Russell
[Report] The Violent Collisional History of Asteroid 4 Vesta
Spacecraft data provide a detailed characterization of the second most massive asteroid in the solar system.Authors: S. Marchi, H. Y. McSween, D. P. O’Brien, P. Schenk, M. C. De Sanctis, R. Gaskell, R. Jaumann, S. Mottola, F. Preusker, C. A. Raymond, T. Roatsch, C. T. Russell
[Report] Vesta’s Shape and Morphology
Spacecraft data provide a detailed characterization of the second most massive asteroid in the solar system.Authors: R. Jaumann, D. A. Williams, D. L. Buczkowski, R. A. Yingst, F. Preusker, H. Hiesinger, N. Schmedemann, T. Kneissl, J. B. Vincent, D. T. Blewett, B. J. Buratti, U. Carsenty, B. W. Denevi, M. C. De Sanctis, W. B. Garry, H. U. Keller, E. Kersten, K. Krohn, J.-Y. Li, S. Marchi, K. D. Matz, T. B. McCord, H. Y. McSween, S. C. Mest, D. W. Mittlefehldt, S. Mottola, A. Nathues, G. Neukum, D. P. O’Brien, C. M. Pieters, T. H. Prettyman, C. A. Raymond, T. Roatsch, C. T. Russell, P. Schenk, B. E. Schmidt, F. Scholten, K. Stephan, M. V. Sykes, P. Tricarico, R. Wagner, M. T. Zuber, H. Sierks
[Report] Dawn at Vesta: Testing the Protoplanetary Paradigm
Spacecraft data provide a detailed characterization of the second most massive asteroid in the solar system.Authors: C. T. Russell, C. A. Raymond, A. Coradini, H. Y. McSween, M. T. Zuber, A. Nathues, M. C. De Sanctis, R. Jaumann, A. S. Konopliv, F. Preusker, S. W. Asmar, R. S. Park, R. Gaskell, H. U. Keller, S. Mottola, T. Roatsch, J. E. C. Scully, D. E. Smith, P. Tricarico, M. J. Toplis, U. R. Christensen, W. C. Feldman, D. J. Lawrence, T. J. McCoy, T. H. Prettyman, R. C. Reedy, M. E. Sykes, T. N. Titus
[Perspective] Climate Change: The Ice Age Carbon Puzzle
A carbon isotope record helps to explain why carbon dioxide concentrations change during ice age cycles.Author: Edward Brook
[Perspective] Molecular Biology: RNA Plays Meiotic Matchmaker
RNA plays a role in homologous chromosome pairing during meiosis.Author: Abby F. Dernburg
[Perspective] Physics: Intertwining Electron Tunneling with Light
The tunneling of electrons through barriers can be controlled when photons are coupled to excited states of electrons trapped in quantum wells.Author: Marzena H. Szymańska
[Perspective] Structural Biology: PARP-1 Activation—Bringing the Pieces Together
A model structure sheds light on how the PARP-1 protein is activated in DNA repair.Authors: Jean-Philippe Gagné, Michèle Rouleau, Guy G. Poirier
[Perspective] Geophysics: Understanding Earthquakes
Sophisticated numerical models can reproduce a wide range of seismic activity at the Parkfield segment of the San Andreas Fault.Author: Paul Segall
[Perspective] Cell Biology: FGF21 Takes a Fat Bite
A growth factor's varied effects on adipose tissue and thermogenesis may be attributable to its local and systemic actions.Authors: Carles Cantó, Johan Auwerx
[Policy Forum] Research Priorities: ELSI 2.0 for Genomics and Society
We need an international infrastructure for the ethical, legal, and social implications of genomic research.Authors: Jane Kaye, Eric M. Meslin, Bartha M. Knoppers, Eric T. Juengst, Mylène Deschênes, Anne Cambon-Thomsen, Donald Chalmers, Jantina De Vries, Kelly Edwards, Nils Hoppe, Alastair Kent, Clement Adebamowo, Patricia Marshall, Kazuto Kato
[Books et al.] Books Received
A
listing of books received
at Science during the week ending 04 May 2012.
[Book Review] Energy: The Wind at Our Backs
Building on his interviews with people involved in the development of wind energy, Warburg chronicles the industry's growth and challenges.Author: Dan Reicher
[Book Review] Neuroscience: Recalling Space and Time
In a narrative format that combines experimental results, theory, and personal experience, Hasselmo discusses his quantitative model of the brain mechanisms for encoding and remembering our experiences.Author: Laura Lee Colgin
[Correction] Corrections and Clarifications
[Letter] Presumed Guilt in the Anthrax Case—Response
Author: David A. Relman
[Letter] Presumed Guilt in the Anthrax Case
Author: Jeanne Guillemin
[Letter] NextGenVoices: Experiences That Changed Us: Last Call
[Letter] Conservation Concerns in the Deep
Authors: Aaron C. Hartmann, Lisa A. Levin
[News Focus] Chagas Disease: With Novel Paint, Chemist Aims To Vanquish the Vinchuca
Spanish chemist Pilar Mateo invented a clever way to package insect-control agents in paint; after a decade of trying, she's persuaded Bolivia to give it a test.Author: Jean Friedman-Rudovsky
[News Focus] Invasive Species: Researchers Set Course To Blockade Ballast Invaders
As U.S. regulations loom, scientists are working to test new devices that can remove potentially invasive organisms from ships' ballast water.Author: Daniel Strain
[News Focus] Invasive Species: A Foul Problem
From mussels to barnacles to algae, studies suggest that "hull-fouling" organisms could pose an invasion threat that is as great as if not greater than that from ballast creatures, researchers say.Author: Daniel Strain
[News Focus] Paleobotany: Primeval Land Rises From the Ashes
A "vegetational Pompeii" buried in a coal deposit is shedding light on ecosystem structure and climate during the Permian period.Author: Mara Hvistendahl
[News & Analysis] Condensed-Matter Physics: Reprise of First Experiment Casts Doubt on Supersolid Helium
A second pair of physicists has found further evidence that solid helium doesn't flow—ironically, by tweaking the experiment that started the controversy in the first place.Author: Adrian Cho
[News & Analysis] Astronomy: Venus's Rare Sun Crossing May Aid Search for Exoplanets
Early next month, skywatchers will get their second—and final—chance this century to observe a rare mini-eclipse in which Venus crosses in front of the sun.Author: Ron Cowen
[News & Analysis] Lab Exposure: Death of California Researcher Spurs Investigation
Local and federal health agencies are investigating the death of Richard Din, a 25-year-old research associate at the Veterans Affairs Medical Center in San Francisco, California.Author: Greg Miller
[News & Analysis] Space Science: Europe Picks Jupiter Probe; Runners-Up Vow to Press On
Last week, the European Space Agency announced that it had chosen a €1 billion satellite to study three icy moons of Jupiter as its next major science mission, scheduled to be launched in 2022.Author: Edwin Cartlidge
[News of the Week] Newsmakers
This week's Newsmakers are German Education and Research Minister Annette Schavan, who is facing allegations that she plagiarized parts of her dissertation, and Franco-Algerian particle physicist Adlène Hicheur, who received a 5-year prison sentence on terrorism charges.
[News of the Week] Random Sample
Students from five schools in rural Montana won a $15,000 prize in the America's Home Education Energy Challenge. Deep inside a mountain cave in Dachstein, Austria, an international team of researchers showed off a new suit that simulates the challenges that await human visitors to Mars. And this week's numbers quantify signatures protesting the Discovery Channel's self-censorship of climate change issues, the percentage of current Earth-observing capacity that the United States will have by 2020, and the rate of premature births in the United States.