1,419 research outputs found

    Fields of influence of technological change in EC intercountry input-output tables, 1970-80

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    The paper considers a (static) portfolio system that satisfies adding-up contraints and the gross substitution theorem. The paper shows the relationship of the two conditions to the weak dominant diagonal property of the matrix of interest rate elasticities. This enables to investigate the impact of simultaneous changes in interest rates on the asset demands.

    Inclusive and differential cross section measurement of ttbbt\overline{t}b\overline{b} production and studies of ttt\overline{t} production with additional jet radiation

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    Differential measurements of the ttbbt\overline{t}b\overline{b} process are presented, targeting the system of b jets produced in addition to the ttt\overline{t} system

    Measurements of associated ttX\textrm{t}\overline{\textrm{t}}\textrm{X}

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    Inclusive and differential cross section measurements of tt\textrm{t}\overline{\textrm{t}}-associated processes are performed at the ATLAS and CMS Collaborations with high precision. In this contribution, a selection of recent measurements of inclusive and differential measurements of the ttγ\textrm{t}\overline{\textrm{t}}\gamma, ttZ\textrm{t}\overline{\textrm{t}}\textrm{Z} and ttW\textrm{t}\overline{\textrm{t}}\textrm{W} processes are presented. Searches for tttt\textrm{t}\overline{\textrm{t}}\textrm{t}\overline{\textrm{t}} production are presented for both collaborations, providing evidence for the process.Comment: Talk at the 15th International Workshop on Top Quark Physics, Durham, UK, 4-9 September 202

    Recognition of two distinct elements in the RNA substrate by the RNA-binding domain of the T. thermophilus DEAD box helicase Hera

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    DEAD box helicases catalyze the ATP-dependent destabilization of RNA duplexes. Whereas duplex separation is mediated by the helicase core shared by all members of the family, flanking domains often contribute to binding of the RNA substrate. The Thermus thermophilus DEAD-box helicase Hera (for “heat-resistant RNA-binding ATPase”) contains a C-terminal RNA-binding domain (RBD). We have analyzed RNA binding to the Hera RBD by a combination of mutational analyses, nuclear magnetic resonance and X-ray crystallography, and identify residues on helix α1 and the C-terminus as the main determinants for high-affinity RNA binding. A crystal structure of the RBD in complex with a single-stranded RNA resolves the RNA–protein interactions in the RBD core region around helix α1. Differences in RNA binding to the Hera RBD and to the structurally similar RBD of the Bacillus subtilis DEAD box helicase YxiN illustrate the versatility of RNA recognition motifs as RNA-binding platforms. Comparison of chemical shift perturbation patterns elicited by different RNAs, and the effect of sequence changes in the RNA on binding and unwinding show that the RBD binds a single-stranded RNA region at the core and simultaneously contacts double-stranded RNA through its C-terminal tail. The helicase core then unwinds an adjacent RNA duplex. Overall, the mode of RNA binding by Hera is consistent with a possible function as a general RNA chaperone
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