Results 41 to 50 of about 887,867 (297)

Direct Observation of Localized Radial Oxygen Migration in Functioning Tantalum Oxide Memristors

, 2016
Oxygen migration in tantalum oxide, a promising next-generation storage material, is studied using in-operando x-ray absorption spectromicroscopy and is used to microphysically describe accelerated evolution of conduction channel and device failure.
Andrews, Chen, Demiryont, Dilks, Gao, Goldfarb, Hur, Jan, Kalantarian, Kamiya, Kamiya, Kilcoyne, Kim, Kim, Kim, Kim, Knop-Gericke, Kumar, Kumar, Maeda, Magyari-Köpe, Menzel, Miao, Noman, Pan, Park, Pierret, Qiu, Qiu, Ruckman, Strachan, Strachan, Strukov, Strukov, Strukov, Torrezan, Wedig, Wei, Yang, Yang, Yang, Yoon, Zhao   +42 more
core   +2 more sources

New phase diagrams for dense carbon-oxygen mixtures and white dwarf evolution [PDF]

, 2011
Cool white dwarfs are reliable and independent stellar chronometers. The most common white dwarfs have carbon-oxygen dense cores. Consequently, the cooling ages of very cool white dwarfs sensitively depend on the adopted phase diagram of the carbon ...
A. H. Córsico, Alexander, Althaus, Althaus, Althaus, Althaus, Barrat, Benvenuto, Cassisi, Córsico, E. García-Berro, García-Berro, García-Berro, García-Berro, García-Berro, García-Berro, Hansen, Horowitz, Ichimaru, Iglesias, Isern, Isern, Isern, Isern, J. Isern, L. G. Althaus, M. M. Miller Bertolami, Magni, Medin, Mochkovitch, Montgomery, Ogata, Renedo, Rohrmann, Salaris, Salaris, Segretain, Segretain, Stevenson, Van Horn, von Hippel, Winget, Winget   +42 more
core   +3 more sources

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Elucidation of the Electrocatalytic Function of Composite Metal Carbides Co3W3C and Co3Mo3C with Oxygen Reduction and Oxygen Evolution Reactions

Electrochemistry
Metal-air secondary batteries have attracted attention as a next-generation energy storage system due to their high energy density and environmentally friendly characteristics.
Ikki YANAGIMOTO, Masashi WADA, Satoko TAKASE, Toshiyuki TAKIZAWA, Youichi SHIMIZU   +4 more
doaj   +1 more source

Contrasted Reactivity to Oxygen Tensions in Frankia sp. Strain CcI3 throughout Nitrogen Fixation and Assimilation [PDF]

, 2014
Reconciling the irreconcilable is a primary struggle in aerobic nitrogen-fixing bacteria. Although nitrogenase is oxygen and reactive oxygen species-labile, oxygen tension is required to sustain respiration.
Beauchemin, Nicholas, Ghodhbane-Gtari, Faten, Gtari, Maher, Hezbri, Karima, Ktari, Amir, Sbissi, Imed, Tisa, Louis S.   +6 more
core   +4 more sources

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

Novel Riboflavin-Inspired Conjugated Bio-Organic Semiconductors

Molecules, 2018
Flavins are known to be extremely versatile, thus enabling routes to innumerable modifications in order to obtain desired properties. Thus, in the present paper, the group of bio-inspired conjugated materials based on the alloxazine core is synthetized ...
Jan Richtar, Patricie Heinrichova, Dogukan Hazar Apaydin, Veronika Schmiedova, Cigdem Yumusak, Alexander Kovalenko, Martin Weiter, Niyazi Serdar Sariciftci, Jozef Krajcovic   +8 more
doaj   +1 more source

Effects of Rotation on the Minimum Mass of Primordial Progenitors of Pair Instability Supernovae [PDF]

, 2012
The issue of which stars may reach the conditions of electron/positron pair formation instability is of importance to understand the final evolution both of the first stars and of contemporary stars.
Abel, Abel, Appenzeller, Bromm, Chatzopoulos, Chatzopoulos, Chevalier, de Jager, Dufton, E. Chatzopoulos, Ekström, El Eid, El Eid, Fryxell, Greif, Heger, Heger, Heger, Heger, Heger, J. Craig Wheeler, Joggerst, Kasen, Leloudas, Maeder, Maeder, Miller, Ober, Ohkubo, Paxton, Quimby, Scannapieco, Smith, Smith, Spruit, Stringfellow, Timmes, Timmes, Waldman, Yoon, Yoon   +40 more
core   +2 more sources

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

Nucleosynthesis during the Merger of White Dwarfs and the Origin of R Coronae Borealis Stars [PDF]

, 2011
Many hydrogen deficient stars are characterised by surface abundance patterns that are hard to reconcile with conventional stellar evolution. Instead, it has been suggested that they may represent the result of a merger episode between a helium and a ...
Asplund, Clayton, Cyburt, Fujimoto, Lugaro, Pandey, Pandey, Renedo, Renzini   +8 more
core   +3 more sources