Tetra­kis[μ-4-(methyl­amino)­benzoato-κ2 O:O′]bis­[(N,N-diethyl­nicotinamide-N 1)zinc(II)] dihydrate

The title mol­ecule, [Zn2(C8H8NO2)4(C10H14N2O)2]·2H2O, is a centrosymmetric binuclear complex, with two ZnII ions [Zn⋯Zn’ = 2.9301 (4) Å] bridged by four methyl­amino­benzoate (MAB) ligands. The four nearest O atoms around each ZnII ion form a distorted square-planar arrangement with the distorted square-pyramidal coordination completed by the pyridine N atom of the N,N-diethyl­nicotinamide (DENA) ligand. Each ZnII ion is displaced by 0.3519 (2) Å from the plane of the four O atoms, with an average Zn—O distance of 2.030 Å. The dihedral angles between carboxyl­ate groups and adjacent benzene rings are 10.57 (10) and 16.63 (12)°, while the benzene rings are oriented at a dihedral angle of 81.84 (5)°. The pyridine ring is oriented at dihedral angles of 40.49 (6) and 51.25 (6)° with respect to the benzene rings. In the crystal structure, inter­molecular O—H⋯O and N—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network. The π–π contact between the inversion-related pyridine rings [centroid–centroid distance = 3.633 (1) Å] may further stabilize the crystal structure

Robust multipartite entanglement generation via a collision model

We examine a simple scheme to generate genuine multipartite entangled states across disjoint qubit registers. We employ a shuttle qubit that is sequentially coupled, in an energy preserving manner, to the constituents within each register through rounds of interactions. We establish that stable $W$-type entanglement can be generated among all qubits within the registers. Furthermore, we find that the entanglement is sensitive to how the shuttle is treated, showing that a significantly larger degree is achieved by performing projective measurements on it. Finally, we assess the resilience of this entanglement generation protocol to several types of noise and imperfections, showing that it is remarkably robust.Comment: 11 pages, 7 figures. Close to published versio

Collisional unfolding of quantum Darwinism

We examine the emergence of objectivity via quantum Darwinism through the use of a collision model, i.e. where the dynamics is modeled through sequences of unitary interactions between the system and the individual constituents of the environment, termed "ancillas". By exploiting versatility of this framework, we show that one can transition from a "Darwinistic" to an "encoding" environment by simply tuning their interaction. Furthermore we establish that in order for a setting to exhibit quantum Darwinism we require a mutual decoherence to occur between the system and environmental ancillas, thus showing that system decoherence alone is not sufficient. Finally, we demonstrate that the observation of quantum Darwinism is sensitive to a non-uniform system-environment interaction.Comment: 7 pages, 3 figures. Close to published versio

Endovascular treatment of femoro-popliteal artery stenosis/obstruction using a repositionable self-expanding nitinol stent: a preliminary study

Introduction. The aim of this study was to report our preliminary results regarding the use of the repositionable self-expanding nitinol stent in a cohort of patients with femoro-popliteal artery occlusion/stenosis. Material and methods. The study groups consisted a total of 8 patients (10 extremities) between 47 and 70 years of age who presented with typical symptoms of intermittent claudication and/or critical limb ischaemia (Fontaine stage II–IV) and underwent primary elective superficial femoral artery percutaneous transluminal angioplasty and/or stenting using a Jaguar repositionable self-expanding nitinol stent in the dates of 2013–2015. Information for patency at 6th month after the stenting procedure was obtained. Results. The mean operation time was 38.56 ± 26.40 minutes. No patients had procedure-related stent fracture, distal thromboembolism, haematoma, femoral pseudoaneurysm or stent occlusion. At 6-month follow-up, at least one categorical improvement was observed in 7 patients (87.5% of intent-to-treat population). Conclusions. The Jaguar self-expanding nitinol stent has several technical advantages, and its use was associated with a low risk of complications. Further study is warranted to establish its superiority in providing good long-term patency

EVALUATION OF FACTORS AFFECTING DENTAL ANXIETY IN ADOLESCENTS

Objectives: Dental anxiety determines the frequency of dental treatment availed with long-term implications in oral health maintenance. The aim of this study is to investigate the effects of sociodemographic data, dental anxiety levels of parents, family functionality, perceived family support and other associated factors on dental anxiety of adolescents. Materials and Methods: 213 adoloscents who applied to the Pediatric Dental Clinic and their parents were included in the study and their sociodemographic data were recorded. The Corah Dental Anxiety Scale was applied to the adolescents and their parents to determine dental anxiety and the Perceived Family Support Scale was applied to measure the perceived family support of the adolescents. Regarding the family functionality, the parents answered the Family Assessment Device. Results: The avarage dental anxiety level of the adolescents was 8.87±3.10. The family functions were unhealthy in terms of roles, and affective involvement. According to the multiple regression analysis, the predictors of dental anxiety levels were family functionality, maternal educational level, previous application to the dentist, having negative experience in the past, the choosing of a dental treatment center, and training regarding dental treatment. Conclusions: Clinicians should consider that socio-cultural characteristics, family functionality and support may affect dental anxiety, and the improvement of the physical environment may be effective in reducing dental anxiety during dental treatment of adolescents