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Science Highlights


Science highlights feature research conducted by staff and users at the ALS.

If a Power Point summary slide or a PDF handout of the highlight is available, you will find it linked beneath the highlight listing and on the highlight's page. You may also print a version of a highlight by clicking the print icon associated with each highlight.



How the Membrane Protein AmtB Transports Ammonia Print
Wednesday, 25 May 2005 00:00

While life scientists have solved the structures of protein channels for ions, uncharged solutes, and even water, up to now they have only been able to guess at the precise mechanisms by which gases cross biological membranes.

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Influence of Topological Spin Fluctuations on Charge Transport Print
Wednesday, 27 April 2005 00:00

Layered transition metal oxides are the focus of intense research efforts because they might clarify the superconducting mechanism of cuprate high-temperature superconductors (HTSCs).

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Electron Trapping by Molecular Vibration Print
Wednesday, 27 April 2005 00:00

In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations.

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ARPES Provides Direct Evidence of Spin-Wave Coupling Print
Wednesday, 30 March 2005 00:00

The electronic properties of a metal are determined by the dynamical behavior of its conduction electrons. Conventional band theory accounts for the interaction of the electrons with the static ion lattice.

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A New Gap-Opening Mechanism in a Triple-Band Metal Print
Wednesday, 23 February 2005 00:00

A collaboration between researchers have discovered that the phase transition from metal to insulator that occurs at low temperature in indium wires on the silicon (111) surface involves not only the expected shift in the electronic structure (band-gap opening) but also a band restructuring that gives rise to an energy gap in a second band.

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Extracting the Eliashberg Function Print
Wednesday, 23 February 2005 00:00

Recent advances in experimental techniques combined with ever-growing theoretical capabilities now hold the promise of presenting an unprecedented picture of violations of the Born-Oppenheimer approximation (BOA), which decouples electronic from nuclear motion in quantum calculations of solids.

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Polaron Behavior in CMR Manganites Print
Wednesday, 26 January 2005 00:00

Colossal magnetoresistive (CMR) manganites are a class of materials under study for future spintronic applications such as nonvolatile magnetic computer memory (MRAM). Researchers have recently used several soft x-ray spectroscopies at the ALS to study a prototypical CMR manganite as it was heated past its Curie temperature.

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GRK2 Enzyme Helps Keep G Proteins at Bay Print
Wednesday, 28 January 2004 00:00

G proteins are switches for important signaling cascades, including those that control heart rate and mediate the senses. To adapt to changes, activated G-protein receptors must be rapidly desensitized, a process initiated by GRK enzymes. Researchers at the ALS determined the structure of a form of GRK in complex with portions of its target molecule.

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Science Highlight Archives: 1995-2004 Print
Thursday, 04 May 2000 08:31


Archived Science Highlights

Highlights posted before the year 2005

Biological Sciences

Snapshots of Ribozyme Reaction States Reveal Structural Switch (11/04)

Nerve Growth Factor Gets Good Reception (10/04)

Bringing the Mesoscale into Focus (9/04)

Targeting Proteins to Membranes (8/04)

Starting the RNA Assembly Line (8/04)

Structure of a DNA Clamp–Loader Complex (7/04)

Structure of Telomere-Protecting Proteins (4/04)

Designing a Novel Globular Protein Fold (3/04)

GRK2 Enzyme Helps Keep G Proteins at Bay (1/04)

Glycoprotein Receptor Yields Clues to Platelet "Stickiness" (11/03)

Antibiotic-Resistant Ribosome Sheds Light on Protein Synthesis (10/03)

Nogo Receptor Yields Framework for Neuron-Repair Studies (10/03)

Aquaporin Structure Elucidates Water Transport (10/02)

Protein Pump Reveals Secrets of Drug Resistance (8/03)

Clues to Cholesterol Regulation Found in LDLR Structure (5/03)

Kinesin Action Crystallized in Two Key States (5/02)

Zooming in on Ribosomes (9/01)

First High-Resolution Structure for an Aquaporin (5/01)

Key Domain in HIV-1 Gene Shows Unexpected Flexibility (10/00)

IR Spectra Show Dioxin-Induced Changes in Living Cells (9/00)

Enzyme Structure Provides Clues to DNA Transcription Details (8/00)

Structure of a Key Link in the Respiratory Chain (4/00)

Bacteriorhodopsin: Pumping Ions (3/00)

Solving the Ribosome Puzzle (12/99)

Clathrin Structure Reveals Motifs for Self-Assembly (9/99)

First Protein Structure of a Key Molecular Engine (7/99)

Structural Genomics of M. Jannaschii (3/99)


Polymers and Soft Matter

Segregation in Mixed Polymer Brushes (2/03)

Crosslink Density of Superabsorbent Polymers (3/01)

Vibronic Features in Polymer NEXAFS (1/01)

Polymers in Confined Geometries (5/99)

Dynamic Scattering of Coherent Soft X Rays (4/99)


Atomic and Molecular Physics

Dynamic Jahn–Teller Effect in Buckyball Cations (11/02)

Photoionization of Metastable Ions: First Absolute Measurement (8/02)

Quantum Chaos in Helium (12/01)

Gas-Phase Molecules Illuminated from Within (11/01)

Spectra of Anionic Fragments Verify Shape Resonances (10/01)

More Trouble for the Dipole Approximation (2/01)

Symmetry Resolution Yields Evidence for Shape Resonance (10/99)

Angle-Resolved 2-D Spectra Highlight Spin-Orbit Effects (2/99)

Ethene Spectrum Measured at Fundamental Limits of Resolution (4/98)

Doubly Excited Lithium (11/95)


Chemical Dynamics

PFI-PEPICO Data Suggest Recalibration of Proton Affinities (1/01)

Dynamics of Pentane and Propane Metathesis Reactions (1/99)

The Inside Story on Oxygen (12/97)


Semiconductors, Surfaces, and Interfaces

Electromigration-Induced Plastic Deformation (1/03)

How Carbon Monoxide Adsorbs at Different Sites (5/01)

Electron-Phonon Coupling at the Tungsten Surface (12/00)

Femtosecond Structural Dynamics Observed in Semiconductor Crystals (9/99)

A Step Toward Inexpensive, Efficient Solar Cells (11/97)

Surface Alloy Structure Determined Using Photoelectron Diffraction and Holography (5/97)

 

Earth and Environmental Science

Organic Matter in Interplanetary Dust (9/04)

Why Alcohol and Water Don't Mix (12/03)

Study Reveals Orbital Mixing Between Water and Dissolved Ions (11/03)

High-Quality X-Ray Scattering Data for Water (6/03)

Microfocus on Nickel Sequestration in Soils (4/03)

EXAFS from Hydrogen Atoms in Water (8/01)

Unearthing the Structure of Humic Substances (5/00)

Quantitative Zinc Speciation in Soils (2/00)

Microbial Reduction of Hexavalent Chromium (8/99)


Ultrafast/Time-Resolved Studies

Picosecond Magnetization Dynamics (10/04)

Ultrafast XANES Technique Reveals Photochemical Transients (8/03)

Laser Time Slicing Promises Ultrafast Time Resolution (7/00)

Streak Camera Records Ultrafast Lattice Dynamics (6/00)


Magnetism

Stripe Domains in Coupled Magnetic Sandwiches (12/04)

Creation of an Antiferromagnetic Exchange Spring (12/04)

Pinning Down Exchange Bias (4/04)

Standing Waves Probe Nanowedge Interfaces (7/02)

Modified Magnetism at Buried Interfaces (11/01)

Antiferromagnetic Spin Reorientation (6/01)

PEEM2 Reveals Spin Alignment in Magnetic Layers (7/00)

First X-Ray Microscope Images with Clear Antiferromagnetic Contrast (11/99)

Quantum Well States in Copper Thin Films (6/99)

X-Ray Resonant Scattering from Magnetic Multilayers (11/98)

Quantum Interference Observed in Thin Films (9/98)

Magnetic Phase Transitions Probed with Spin-Polarized Photoelectron Diffraction (10/96)

Fluorescence Study of Iron Silicide Multilayer (3/96)


Optics

EUV Lithography Proof Is in the Printing (7/02)

New Measurements of Scattering from Multilayer Mirrors (2/98)


Complex Materials

Unusual Isotope Effect in Bi2212 (9/04)

Quasi-1D Metal Shows Unusual Spectral Behavior (5/04)

Nanodiamonds Show Buckyball Surface (3/04)

Buckyball Monolayer Electronic Structure (2/04)

RIXS Technique Measures Hubbard Interaction (10/02)

Role of Lattice Vibrations in Superconductivity (10/01)

Electronic Structure of CMR Oxides (7/01)

Electronic Structure of Quasicrystals (11/00)

Charge Stripes in High-Temperature Superconductors (1/00)

X-Ray Raman Scattering Establishes HTSC Energy Scales (12/98)

Site-Selective Spectroscopy of Strontium Ruthenate with Soft X-Ray Emission (5/98)

Experiment Verifies Quasi-Particle Model for Diamond (6/97)


Instrumentation

Demonstration of Coherent X-Ray Diffraction Imaging (3/04)

Coherent Terahertz Synchrotron Radiation (6/03)

Frequency Map Analysis Applied to ALS (10/00)

Femtosecond X Rays Generated at Beam Test Facility (2/97)


ALS Events

Superbends at the ALS: A Perfect Fit (10/01)

Synchrotron Radiation Turns the Big Five-O (4/97)

 

More Recent ALS Science

 
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