TY - GEN A1 - Finch, Nicolle L. A1 - Braker, I. P. A1 - Reindl, Nicole A1 - Barstow, Martin A. A1 - Casewell, Sarah L. A1 - Burleigh, M. A1 - Kupfer, Thomas A1 - Kilkenny, D. A1 - Geier, Stephan A1 - Schaffenroth, Veronika A1 - Bertolami Miller, Marcelo Miguel A1 - Taubenberger, Stefan A1 - Freudenthal, Joseph T1 - Spectral Analysis of Binary Pre-white Dwarf Systems T2 - Radiative signatures from the cosmos N2 - Short period double degenerate white dwarf (WD) binaries with periods of less than similar to 1 day are considered to be one of the likely progenitors of type Ia supernovae. These binaries have undergone a period of common envelope evolution. If the core ignites helium before the envelope is ejected, then a hot subdwarf remains prior to contracting into a WD. Here we present a comparison of two very rare systems that contain two hot subdwarfs in short period orbits. We provide a quantitative spectroscopic analysis of the systems using synthetic spectra from state-of-the-art non-LTE models to constrain the atmospheric parameters of the stars. We also use these models to determine the radial velocities, and thus calculate dynamical masses for the stars in each system. Y1 - 2019 SN - 978-1-58381-925-8 SN - 1050-3390 VL - 519 SP - 231 EP - 238 PB - Astronomical soc pacific CY - San Fransisco ER - TY - JOUR A1 - Ball, Steven G. A1 - Liénard, Luc A1 - Wattebled, Fabrice A1 - Steup, Martin A1 - Hicks, Glenn A1 - d'Hulst, Christophe T1 - Defining the functions of maltodextrin active enzymes in starch metabolism in the unicellular alga Chlamydomonas reinhardtii Y1 - 2003 ER - TY - JOUR A1 - Deschamps, Philippe A1 - Haferkamp, Ilka A1 - Dauvillee, David A1 - Haebel, Sophie A1 - Steup, Martin A1 - Buleon, Alain A1 - Putaux, Jean-Luc A1 - Colleoni, Christophe A1 - d'Hulst, Christophe A1 - Plancke, Charlotte A1 - Gould, Sven A1 - Maier, Uwe A1 - Neuhaus, Heinz Eckhard A1 - Ball, Steven G. T1 - Nature of the periplastidial pathway of starch synthesis in the cryptophyte Guillardia theta N2 - The nature of the periplastidial pathway of starch biosynthesis was investigated with the model cryptophyte Guillardia theta. The storage polysaccharide granules were shown to be composed of both amylose and amylopectin fractions with a chain length distribution and crystalline organization very similar to those of starch from green algae and land plants. Most starch granules displayed a shape consistent with biosynthesis occurring around the pyrenoid through the rhodoplast membranes. A protein with significant similarity to the amylose-synthesizing granule-bound starch syntbase 1 from green plants was found as the major polypeptide bound to the polysaccharide matrix. N-terminal sequencing of the mature protein proved that the precursor protein carries a nonfunctional transit peptide in its bipartite topogenic signal sequence which is cleaved without yielding transport of the enzyme across the two inner plastid membranes. The enzyme was shown to display similar affinities for ADP and UDP-glucose, while the V-max measured with UDP-glucose was twofold higher. The granule-bound starch synthase from Guillardia theta was demonstrated to be responsible for the synthesis of long glucan chains and therefore to be the functional equivalent of the amylose- synthesizing enzyme of green plants. Preliminary characterization of the starch pathway suggests that Guillardia theta utilizes a UDP-glucose-based pathway to synthesize starch Y1 - 2006 UR - http://ec.asm.org/ U6 - https://doi.org/10.1128/Ec.00380-05 SN - 1535-9778 ER - TY - JOUR A1 - D'Ascenzo, Stefania A1 - Lugli, Luisa A1 - Nicoletti, Roberto A1 - Fischer, Martin H. T1 - Assessing orienting of attention to understand the time course of mental calculation JF - Cognitive processing : international quarterly of cognitive science N2 - Number processing induces spatial attention shifts to the left or right side for small or large numbers, respectively. This spatial-numerical association (SNA) extends to mental calculation, such that subtractions and additions induce left or right biases, respectively. However, the time course of activating SNAs during mental calculation is unclear. Here, we addressed this issue by measuring visual position discrimination during auditory calculation. Thirty-four healthy adults listened in each trial to five successive elements of arithmetic facts (first operand, operator, second operand, equal and result) and verbally classified their correctness. After each element (except for the result), a fixation dot moved equally often to either the left or right side and participants pressed left or right buttons to discriminate its movement direction (four times per trial). First and second operand magnitude (small/large), operation (addition/subtraction), result correctness (right/wrong) and movement direction (left/right) were balanced across 128 trials. Manual reaction times of dot movement discriminations were considered in relation to previous arithmetic elements. We found no evidence of early attentional shifts after first operand and operator presentation. Discrimination performance was modulated consistent with SNAs after the second operand, suggesting that attentional shifts occur once there is access to all elements necessary to complete an arithmetic operation. Such late-occurring attention shifts may reflect a combination of multiple element-specific biases and confirm their functional role in mental calculation. KW - Attention KW - Mental arithmetic KW - Numerical cognition KW - Spatial-numerical KW - associations Y1 - 2020 U6 - https://doi.org/10.1007/s10339-020-00970-y SN - 1612-4782 SN - 1612-4790 VL - 21 IS - 4 SP - 493 EP - 500 PB - Springer CY - Heidelberg ; Berlin ER - TY - JOUR A1 - D'Ascenzo, Stefania A1 - Fischer, Martin H. A1 - Shaki, Samuel A1 - Lugli, Luisa T1 - Number to me, space to you BT - joint representation of spatial-numerical associations JF - Psychonomic bulletin & review : a journal of the Psychonomic Society N2 - Recent work has shown that number concepts activate both spatial and magnitude representations. According to the social co-representation literature which has shown that participants typically represent task components assigned to others together with their own, we asked whether explicit magnitude meaning and explicit spatial coding must be present in a single mind, or can be distributed across two minds, to generate a spatial-numerical congruency effect. In a shared go/no-go task that eliminated peripheral spatial codes, we assigned explicit magnitude processing to participants and spatial processing to either human or non-human co-agents. The spatial-numerical congruency effect emerged only with human co-agents. We demonstrate an inter-personal level of conceptual congruency between space and number that arises from a shared conceptual representation not contaminated by peripheral spatial codes. Theoretical implications of this finding for numerical cognition are discussed. KW - Social co-representation KW - Conceptual congruency effect KW - Numerical KW - cognition KW - SNARC effect Y1 - 2021 U6 - https://doi.org/10.3758/s13423-021-02013-9 SN - 1069-9384 SN - 1531-5320 VL - 29 IS - 2 SP - 485 EP - 491 PB - Springer CY - New York ER -