Results 271 to 280 of about 125,477 (314)

Crystal Structure of the Ammine Complex [Ca(C2H)2(NH3)4]

Zeitschrift für anorganische und allgemeine Chemie, EarlyView.
Needle‐shaped crystals of [Ca(C2H)2(NH3)4] were obtained by reacting elemental calcium dissolved in liquid ammonia with acetylene and slowly evaporating the former. X‐ray single crystal structure analysis shows the formation of isolated [Ca(C2H)2(NH3)4] octahedra held together by weak hydrogen bonds. The amine complex is thermally unstable and releases
Lisa Körtgen, David van Gerven, Sean S. Sebastian, Tim Kleinöder, Uwe Ruschewitz   +4 more
wiley   +1 more source

50th anniversary of the Stanford SSRL synchrotron radiation and protein crystallography initiative

Journal of Synchrotron Radiation, EarlyView.
We provide a historical introduction and our thoughts on the current trends including some based on papers in this special issue of Journal of Synchrotron Radiation celebrating the 50th Anniversary of the Stanford SSRL synchrotron radiation and protein crystallography initiative led by Keith Hodgson.We provide a historical introduction spanning the ...
John R. Helliwell, Colin Nave, D. Marian Szebenyi   +2 more
wiley   +1 more source

A case for resonant X‐ray Bragg diffraction by a collinear antiferromagnet Li2Ni3P4O14

Acta Crystallographica Section B, EarlyView.
Amplitudes for resonant X‐ray diffraction by collinear antiferromagnet Li2Ni3P4O14 that include permitted Dirac multipoles, e.g. anapoles, are investigated. Chiral signatures for the rotation of X‐ray helicity are described.Magnetic axial and polar (Dirac) nickel multipoles contribute to resonant X‐ray Bragg amplitudes in a symmetry‐informed analysis ...
Stephen W. Lovesey
wiley   +1 more source

Critical evaluation of three cryo‐EM structures of particulate methane monooxygenase by quantum refinement

Acta Crystallographica Section D, EarlyView.
We have studied the copper sites in three cryogenic electron‐microscopy structures of particulate methane monooxygenase with quantum refinement. We show that the CuA, CuC and CuD sites are correctly modelled and that the CuB site is mononuclear in all structures, whereas we find no support for copper in the suggested trinuclear active site or two sites
Gayathri Yuvaraj, Kristoffer J. M. Lundgren, Elija Veenman, Esko Oksanen, Ulf Ryde   +4 more
wiley   +1 more source

Limiting the effects of radiation damage in MicroED through dose selection during data processing

Acta Crystallographica Section D, EarlyView.
The effect of radiation damage in MicroED has been studied. By only including data collected at low accumulated electron dose during data processing, the effects of radiation damage can be reduced.Microcrystal electron diffraction (MicroED), also known as three‐dimensional electron diffraction (3D ED), allows the collection of diffraction data from ...
Henri Colyn Bwanika, Jingjing Zhao, Gerhard Hofer, Uwe H. Sauer, Hongyi Xu   +4 more
wiley   +1 more source

Depositional Facies, Sequence Stratigraphy, and Diagenesis of Lower Cretaceous Carbonate Reservoir, Southern Iraq: Implications for Petroleum Exploration

Journal of Petroleum Geology, EarlyView.
ABSTRACT The Lower Cretaceous Yamama Formation of southern Iraq represents a key carbonate reservoir within Iraq and the Middle East, yet its complex depositional facies architecture and diagenetic alterations present challenges for predicting reservoir quality.
A. K. A. Mohammed, F. Velledits, I. Q. Mohammed, M. Alsuwaidi, H. Mansurbeg, F. Kristály, D. K. Ivanova, Eloi González‐Esvertit, A. Awdal   +8 more
wiley   +1 more source

The regional evolution of a dryland fluvio‐aeolian and lacustrine succession in response to allocyclic forcing: insights from the Early Permian Cutler Group, Utah, USA

Sedimentology, EarlyView.
ABSTRACT Preserved allocyclic signatures in the rock record often reflect basin‐scale climatic variability and serve as key proxies for correlating ancient dryland successions. The notion of climate cyclicity, however, remains largely untested on regionally constrained, outcrop‐calibrated studies.
Oliver Button, Jack G. Connor, Ross P. Pettigrew, Ben A. Kilhams, John A. Howell   +4 more
wiley   +1 more source

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Small-angle neutron scattering in lysozyme solutions

Physical Review A, 1991
Small-angle neutron scattering has been performed on lysozyme solutions at different concentrations, both at the Intense Spallation Impulsed Source (ISIS), Rutherford-Appleton Laboratory) and at Orph\'ee (Laboratoire Leon Brillouin). The results show that, in addition to the large-scale structural properties revealed by light-scattering experiments ...
GIORDANO, Rita, A. GRASSO, J. TEIXEIRA, WANDERLINGH, Franco, WANDERLINGH, Ulderico   +4 more
openaire   +3 more sources