The effects of majority requirements, selectorate composition and uncertainty in indirect presidential elections: The case of Estonia

This article assesses the effects of common features in the indirect election of presidents in parliamentary republics. In particular, it examines the influence of majority requirements, selectorate composition and uncertainty on party strategies, using Estonia (1996-2016) as a crucial case for analysis. The analysis demonstrates that the lack of a plurality run-off effectively eliminated incentives for inter-party cooperation and strategic voting. It furthermore shows that shifts in the partisan composition and control of the selectorate from parliament to electoral college provided considerable opportunities for agenda manipulation. Subsequently, results only rarely reflected the parliamentary balance of power. Last, although overall indicators suggest greater congruence between parliament and electoral college over time, this proliferated rather than reduced parties’ uncertainty over the electoral outcome as non parliamentary electors voted based on local interests and acted independently from national party leaders

Metastable Strings in Abelian Higgs Models Embedded in Non-Abelian Theories: Calculating the Decay Rate

We study the fate of U(1) strings embedded in a non-Abelian gauge theory with a hierarchical pattern of the symmetry breaking: G->U(1) at V->nothing at v, V>>v. While in the low-energy limit the Abrikosov-Nielsen-Olesen string (flux tube) is perfectly stable, being considered in the full theory it is metastable. We consider the simplest example: the magnetic flux tubes in the SU(2) gauge theory with adjoint and fundamental scalars. First, the adjoint scalar develops a vacuum expectation value V breaking SU(2) down to U(1). Then, at a much lower scale, the fundamental scalar (quark) develops a vacuum expectation value v creating the Abrikosov-Nielsen-Olesen string. (We also consider an alternative scenario in which the second breaking, U(1)->nothing, is due to an adjoint field.) We suggest an illustrative ansatz describing an "unwinding" in SU(2) of the winding inherent to the Abrikosov-Nielsen-Olesen strings in U(1). This ansatz determines an effective 2D theory for the unstable mode on the string world-sheet. We calculate the decay rate (per unit length of the string) in this ansatz and then derive a general formula. The decay rate is exponentially suppressed. The suppressing exponent is proportional to the ratio of the monopole mass squared to the string tension, which is quite natural in view of the string breaking through the monopole-antimonopole pair production. We compare our result with the one given by Schwinger's formula dualized for describing the monopole-antimonopole pair production in the magnetic field.Comment: Significant revisions: 2 sections and 2 figures added, references added, the report number changed; 2 sections revised; Latex, 35 pages, 7 figure

The Rise and Sustainability of Party Leaders in Slovakia : Robert Fico and Mikuláš Dzurinda

Given the fact that only two relevant parties in Slovakia since 1993 have managed to replace their leaders and maintain their relevance, the role of personality traits in the rise and success of party leaders in Slovakia is an especially important topic. Therefore this chapter focuses on two party leaders – Robert Fico and Mikuláš Dzurinda – who are closely tied to more than two decades of political development in Slovakia during 1998-2019. They both managed to utilize their high level of personal popularity to reach the party leadership and via electoral success achieve intra-party cohesion and increase the membership in their parties. However, while Fico relied on his public popularity for another decade after becoming Prime Minister for the first time, Dzurinda gave up on building the popular public image and focused on managing his heterogeneous coalitions. Fico’s SMER thus remained an internally homogeneous party (to an outside observer) for as long as Fico was the most popular politician in Slovakia, while Dzurinda’s SDKÚ was completely marginalized because Dzurinda was not willing to step down as chairman, despite his decreasing public support and increasing criticism from inside the party.Peer reviewe

Streptomyces coelicolor macrodomain hydrolase SCO6735 cleaves thymidine-linked ADP-ribosylation of DNA

ADP-ribosylation is an ancient, highly conserved, and reversible covalent modification critical for a variety of endogenous processes in both prokaryotes and eukaryotes. ADP-ribosylation targets proteins, nucleic acids, and small molecules (including antibiotics). ADP-ribosylation signalling involves enzymes that add ADP-ribose to the target molecule, the (ADP-ribosyl)transferases; and those that remove it, the (ADP-ribosyl)hydrolases. Recently, the toxin/antitoxin pair DarT/DarG composed of a DNA ADP-ribosylating toxin, DarT, and (ADP-ribosyl)hydrolase antitoxin, DarG, was described. DarT modifies thymidine in single-stranded DNA in a sequence-specific manner while DarG reverses this modification, thereby rescuing cells from DarT toxicity. We studied the DarG homologue SCO6735 which is highly conserved in all Streptomyces species and known to be associated with antibiotic production in the bacterium S. coelicolor. SCO6735 shares a high structural similarity with the bacterial DarG and human TARG1. Like DarG and TARG1, SCO6735 can also readily reverse thymidine-linked ADP-ribosylation catalysed by DarT in vitro and in cells. SCO6735 active site analysis including molecular dynamic simulations of its complex with ADP-ribosylated thymidine suggests a novel catalytic mechanism of DNA-(ADP-ribose) hydrolysis. Moreover, a comparison of SCO6735 structure with ALC1-like homologues revealed an evolutionarily conserved feature characteristic for this subclass of macrodomain hydrolases

Crystal structure of pseudojohannite, with a revised formula, Cu(3)(OH)(2)[(UO(2))(4)O(4)SO(4))(2)](H(2)O)(12)

The crystal structure of pseudojohannite from White Canyon, Utah, was solved by charge-flipping from single-crystal X-ray diffraction data and refined to an Robs = 0.0347, based on 2664 observed reflections. Pseudojohannite from White Canyon is triclinic, P1̄, with a = 8.6744(4), b = 8.8692(4), c = 10.0090(5) Å, α = 72.105(4)°, β = 70.544(4)°, γ = 76.035(4)°, and V = 682.61(5) ų, with Z = 1 and chemical formula Cu₃(OH)₂[(UO₂)₄O₄(SO₄)₂](H₂O)₁₂. The crystal structure of pseudojohannite is built up from sheets of zippeite topology that do not contain any OH groups; these sheets are identical to those found in zippeites containing Mg²+, Co²+, and Zn2+. The two Cu²+ sites in pseudojohannite are [5]- and [6]-coordinated by H₂O molecules and OH groups. The crystal structure of the pseudojohannite holotype specimen from Jáchymov was refined using Rietveld refinement of high-resolution powder diffraction data. Results indicate that the crystal structures of pseudojohannite from White Canyon and Jáchymov are identical.J. Plášil, K. Fejfarová, K.S. Wallwork, M. Dušek, R. Škoda, J. Sejkora, J. Čejka, F. Veselovský, J. Hloušek, N. Meisser, J. Brugge