bluuebunny/crossref_metadata_2025_split huggingface dataset:
Increased prevalence of bicuspid aortic valve in Turner syndrome links with karyotype: the crucial importance of detailed cardiovascular screening
Authors: Klásková Eva , Zapletalová Jiřina , Kaprálová Sabina , Šnajderová Marta , Lebl Jan , Tüdös Zbyněk , Pavlíček Jan , Černá Jana , Mihál Vladimír , Stará Veronika , Procházka Martin 
Published: February 2017

AbstractBackground:Bicuspid aortic valve (BAV) represents one of the strongest risk factors for aortic dissection in Turner syndrome (TS). An exact relation between the occurrence of BAV and a particular karyotype has not been established yet. The aim of this study was to determine the association between karyotype and prevalence of BAV.Methods:Sixty-seven TS patients aged between 6.6 and 32.5 years underwent cardiac magnetic resonance imaging (MRI) study. They were divided into four cytogenetic subgroups−45,X karyotype (n=27); 45,X/46,XX mosaicism (n=17); structural abnormalities of the X chromosome (n=10); and 45,X/structural abnormality of the X chromosome mosaicism (n=13). Prevalence of BAV and odds ratio (OR) compared with the general population in the whole study group, and statistical comparison of prevalences of BAV among the individual subgroups were determined.Results:Prevalence of BAV in the whole study group was established as 28.4% [OR 208.3 (95% CI – 103.8–418.0); p-value<0.0001]. Individuals with 45,X karyotype had the highest prevalence of BAV – 40.7%, p-value<0.0001. Presence of any 45,X cell line in karyotype significantly predisposed to BAV (p-value=0.05).Conclusions:The 45,X karyotype is associated with the highest prevalence of BAV. Also, the presence of the 45,X cell line in any mosaic karyotype increases the probability of BAV.
Growth attainment in German children born preterm, and cardiovascular risk factors in adolescence. Analysis of the population representative KiGGS data
Authors: Bergmann Renate L. , Bergmann Karl E. , Richter Rolf , Schlaud Martin , Henrich Wolfgang , Weichert Alexander 
Published: February 2017

AbstractAim:To compare the growth attainment of preterm children and their cardiovascular risk factors at adolescence with the values measured in term children in Germany.Methods:About 17,641 children aged 0 to <18 years were studied between 2003 and 2006 in the population representative German KiGGS survey (“German Health Interview and Examination Survey for Children and Adolescents”) using questionnaires, physical examinations, standardized anthropometric and blood pressure measurements, and blood sample analyses. Analysis of covariance (ANCOVA) was employed for the analyses of anthropometric parameters.Results:About 11.8% of the 16,737 children with complete and valid data had been born preterm. After adjustment for covariates the estimated z-scores over the total age range were larger in term compared to preterm children for length/height (P<0.001; estimated difference B=0.277, 95% CI 0.191–0.362), head circumference (P<0.001; B=0.238, 95% CI 0.144–0.333), BMI (P=0.001; B=0.160, 95% CI 0.069–0.252), and skinfold thickness (P=0.220; B=0.058, 95% CI −0.035 to 0.151). The onset of pubertal development was slightly (but not significantly) earlier in term compared to preterm children. At 14 to <18 years, anthropometric and biochemical indicators of cardiovascular diseases were not worse in preterm compared to term children.Conclusions:Preterm-born German adolescents remained significantly shorter, lighter, and had a smaller head circumference than term-born adolescents, but the risk indicators for cardiovascular diseases were not higher.
Causes of intrauterine fetal death are changing in recent years
Authors: Takita Hiroko , Hasegawa Junichi , Nakamura Masamitsu , Arakaki Tatsuya , Oba Tomohiro , Matsuoka Ryu , Sekizawa Akihiko 
Published: February 2017

Abstract

Objective:
To investigate, how causes of intrauterine fetal death (IUFD) have changed in recent years with the advancement of prenatal diagnosis at a single perinatal center in Japan.

Methods:
Medical records were retrospectively reviewed for all cases of IUFDs that occurred between 2001 and 2014. The most commonly associated causes of fetal deaths were compared between 2001–2007 and 2008–2014.

Results:
The number of IUFD after 20 weeks’ gestation/all deliveries in our center was 38/6878 cases (0.53%) in 2001–2007 and 35/7326 (0.48%) in 2008–2014. The leading cause of IUFD in 2001–2007 was fetal abnormalities (43.2%), the prevalence of which was only 8.6% in 2008–2014 (P<0.01). Meanwhile, the prevalence of umbilical cord abnormalities was relatively increased from 30.0% in 2001–2007 to 54.5% in 2008–2014 (P=0.06). In 2001–2007, chromosomal abnormalities were frequently observed (56% of IUFDs due to fetal abnormalities). Hyper-coiled cord (HCC) and umbilical ring constrictions were the most frequent cause of IUFD in both periods. The relatively decreased prevalence of IUFD due to velamentous cord insertion and umbilical cord entanglement, HCC and umbilical cord constriction was increased.

Conclusions:
The prevalence of IUFD due to fetal abnormalities was reduced, but IUFD associated with umbilical cord abnormalities tended to increase relatively.
Accuracy of a combined insulin-like growth factor-binding protein-1/interleukin-6 test (Premaquick) in predicting delivery in women with threatened preterm labor
Authors: Eleje George Uchenna , Ezugwu Euzebus Chinonye , Eke Ahizechukwu Chigoziem , Eleje Lydia Ijeoma , Ikechebelu Joseph Ifeanyichukwu , Ezebialu Ifeanyichukwu Uzoma , Obiora Chukwudi Celestine , Nwosu Betrand Obi , Ezeama Chukwuemeka Okwudili , Udigwe Gerald Okanandu , Okafor Charles Ikechukwu , Ezugwu Frank Okechukwu 
Published: February 2017

AbstractPurpose:To determine values of combinations of interleukin-6 (IL-6)/cervical native insulin-like growth factor-binding protein-1 (IGFBP-1)/total IGFBP-1 (Premaquick©) in predicting spontaneous deliveries and spontaneous exclusive preterm deliveries in women with threatened preterm labor.Methods:Women with singleton pregnancies between gestation age (GA) of 24 weeks and 36 weeks and 6 days with preterm labor were recruited during a prospective multicenter study. Premaquick© was positive when at least two of three biomarkers were positive. Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy were estimated for both prediction of spontaneous deliveries and spontaneous exclusive preterm deliveries.Results:Ninety-seven (99.0%) out of 98 women enrolled were analyzed. Based on delivery status 7/14 days post-enrollment of general study population, Premaquick© had a sensitivity of 87.1/85.7%, a specificity of 92.4/96.8%, a PPV of 84.4/93.8% and a NPV of 93.9/92.3% for prediction of spontaneous delivery. Predictive accuracy of Premaquick© test in relation to days of enrollment were: 90.7% (≤7 days) and 92.8% (≤14 days). For women enrolled at GA <35 weeks, Premaquick© had a sensitivity of 100.0/87.5%, a specificity of 94.1/96.9%, a PPV of 70.5/87.5%, a NPV of 100.0/96.9% and an accuracy of 95.0/95.0% for prediction of preterm delivery within 7/14 days of enrollment, respectively. PPV was most significantly different in both groups when outcomes were compared between 2 days and 14 days post-enrollment (P<0.001).Conclusion:This novel triple biomarker model of native and total IGFBP-1 and IL-6 appears to be an accurate test in predicting spontaneous deliveries and spontaneous exclusive preterm deliveries in threatened preterm labor in singleton pregnancies.
Characterization of Ni-P coating prepared via electroless deposition on AZ31 magnesium alloy
Authors: Buchtík M. , Kosár P. , Wasserbauer J. , Doležal P. 
Published: February 2017

AbstractThis work deals with the characterization of Ni–P coating prepared via electroless deposition on wrought AZ31magnesium alloy. For the application of electroless deposition was proposed and optimized a suitable pretreatment process of magnesium alloy surface followed by Ni–P coating in the nickel bath. The chemical composition of Ni–P based coating was characterized using the scanning electron microscope with chemical composition analysis. Next, physico-chemical properties and mechanical characteristics of Ni–P coating were evaluated. The mechanism of corrosion degradation of the coating and the substrate was also studied in this work.
Evaluation of protective properties of acrylate varnishes used for conservation of historical metal artefacts
Authors: Švadlena J. , Stoulil J. 
Published: February 2017

Abstract
Acrylate varnishes are due to their suitable properties frequently used in restoration and preservation on variety of historical objects and materials. Common practice of their application involves using as an adhesive agents, consolidants and protective coatings. The purpose of protective coatings especially on metal artefacts is to reduce access of pollutants to the surface of the artefact. In this paper, coatings prepared from two acrylate polymers Paraloid B72 and Paraloid B48N are compared in terms of permeability for water and level of protective properties against air pollutants. For this purpose, electrochemical impedance spectroscopy and resistometric method were chosen for analysis of the coatings. Obtained results show lower permeability for water in case of Paraloid B72. However, same coating provided lower protection against air pollutants than Paraloid B48N coating.
Integrative lineage delimitation in rodents of the Ctenomys Corrientes group
Authors: Caraballo Diego A. , Rossi María Susana 
Published: February 2017

Abstract
The tuco-tucos rodents (genus Ctenomys) of the Corrientes group comprise several populations that inhabit the vast area under the influence of the Iberá wetland. Lineage delimitation within the recently diverged Corrientes group is a challenging task as morphological differentiation is not conspicuous between populations. However, delimitation is crucial for evolutionary studies and conservation issues. In this study, we performed a phylogenetic analysis including cytochrome b (cyt-b) sequences from taxa that had never been studied in a comprehensive context. We integrated previously published chromosomal studies, mitochondrial phylogenies and simple sequence repeat (SSR) variability analyses, and applied a delimitation criterion over the basis of chromosomal incompatibilities and genetic exclusivity. Under this integrative approach seven independently evolving lineages were delimited in the Corrientes group: Ctenomys roigi, which conserves its former definition, Ctenomys dorbignyi and Ctenomys perrensi complex which were redefined, Sarandicito which includes the population of Paraje Sarandicito and probably a group of nearby poorly studied populations, and Iberá i, ii and iii distributed at both sides of the Iberá wetland. We discuss future perspectives to evaluate the proposed lineages and conservation issues concerning these tuco-tucos.
Tourism destination: The networking approach
Authors: Żemła Michał 
Published: February 2017

AbstractDifferent approaches to the analysis of tourism destinations as the basic units of research in tourism, are reviewed in this paper. Traditional geographical and economic perspectives are presented as the bases for more modern system and networking approaches. Network analysis is discussed as the most useful current approach to understand cooperation and coopetition processes taking place in destinations. This approach, developed in general management theory, however, if implicated directly in tourism, is not free from major problems and may lead to misleading conclusions. Among such problems, spatial embeddedness and the non-voluntary character of membership in a network, the crucial role of free goods in product creation, the predominance of SMEs in a destination network, differences between particular destinations and the difficulty in setting clear borders between networks, are discussed.
Air charter leisure traffic and organised tourism in Poland: Are charters passé?
Authors: Taylor Zbigniew 
Published: February 2017

Abstract
Data from a number of tourism and transport sources are used in this analysis, concentrating on Poland: the largest tour operators and areas in which air carriers are likely to have the greatest impact. The top 25 air charter carriers identified are examined closely in terms of connections, and the geographical characteristics of these links are highlighted. The research reveals substantial differences in models of air leisure traffic between Western Europe and Poland. These are of a quantitative, but also a qualitative nature, and reflect the disparate levels of affluence of societies, different mobility patterns, and various experiences, adventures and demands on the part of travellers. Overall, charter traffic in Poland is still seen to be flourishing, while that in Western Europe is in relative decline.
Anytime? Anywhere? The seasonality of flight offers in Central Europe
Authors: Kraft Stanislav , Havlíková Denisa 
Published: February 2017

AbstractAir transport can be considered as the most dynamic transport mode during recent decades. It is an important but also responsive indicator of global social, economic, political and cultural cooperation in different areas. For this reason, air transport is a unique source of various aspects of international relations. The principal goal of this study is an analysis of seasonality in the offer of flights in Central Europe during 2014, considering the different positions and functions of the airports within the air transport system. Ten airports from the Central European region are monitored in the analysis in terms of fluctuations in flight offers and offered destinations. A synthesis of these patterns is presented as a typology of the surveyed airports using the Ossan triangle. This paper clearly shows the different patterns of the spatial and temporal organization of air transport in Central Europe.
The spatial concentration of immigrant pupils at primary and lower secondary schools in the Czech Republic
Authors: Hasman Jiří , Kostelecká Yvona , Hána David 
Published: February 2017

AbstractSince the fall of the Iron Curtain and especially since joining the European Union, the Czech Republic has become a country with a sharply growing number of immigrants, who more and more often are coming to the country with the purpose of settling long term and starting a family. This change places demands on society as a whole but also on particular areas such as the education system, which needs to integrate these children successfully and ensure that they are provided with quality education. The experiences of countries with a long history of migration have shown a negative correlation between the extent of concentration of non-citizen pupils in a school and their academic performance. Such a relationship is explored in this article which examines the degree of concentration of non-citizen pupils at Czech primary and lower secondary schools both in terms of concentration in individual regions, as the spatial distribution of immigrants tends to be very unequal, and in terms of concentrations at particular schools within individual regions. The article shows that despite a current growing concentration of non-citizen students in some regions, there is not clear evidence to confirm a growing segregation at particular schools.
Solvothermal synthesis and characterization of magnetic Fe3O4nanoparticle by different sodium salt sources
Authors: Jamshidiyan M. , Shirani A.S. , Alahyarizadeh Gh. 
Published: February 2017

AbstractFour different magnetic Fe3O4nanoparticles were synthesized and characterized by solvothermal method based on different sodium salts. Sodium salts which were used to synthesize the nanoparticles were NaOAc, Na2CO3, a mixture of NaOAc and Na3Cit, and a mixture of NaOAc and Na2C2O4. The structural and optical properties of the synthesized nanoparticles were examined by XRF, XRD, SEM and FT-IR. The results estimated from XRD pattern and SEM image indicated that the second sample (Na2CO3) had the lowest average particle and crystallite size around 29 nm and 43 nm. It was also shown that the first (NaOAc) and second (Na2CO3) samples had the best FT-IR spectra, similar to the available commercial sample which was provided by Merck. At last, the prepared Fe3O4nanoparticles were applied as sorbents to sorb uranium ions (U(VI)) from radioactive wastewater. The adsorption results showed that the highest U(VI) adsorption was obtained for the second sample in the solution with pH around 10.
Effect of magnesium substitution on structural and dielectric properties of LiNiPO4
Authors: Anand K. , Ramamurthy B. , Veeraiah V. , Vijaya Babu K. 
Published: February 2017

AbstractThe aim of this paper is to study the effect of Mg2+doping in place of Ni in LiNiPO4compounds synthesized by solid state reaction method. As Mg is a relatively light and cheap, and is expected to stabilize the structure, it has been considered as a substituent for Ni. The structural and conductivity studies of the substituted phases are discussed in comparison with LiNiPO4. In this study, we have proposed cation-substituted compounds, LiNi1–xMgxPO4(x = 0, 0.05, 0.1 and 0.15) where a part of the divalent state of Ni2+is replaced with the corresponding amount of Mg2+and where the charge compensation is maintained by lithium deficiency. It is possible to obtain the mentioned compounds because the pristine LiNiPO4compound is stable in ambient atmosphere, which differs considerably from the LiCoPO4compound.
Magnetoelastic properties of epoxy resin based TbxHo0.9−xNd0.1 (Fe0.8Co0.2)1.93 particulate composites
Authors: Zhang Z.R. , Liu J.J. , Song X.H. , Li F. , Zhu X.Y. , Si P.Z. 
Published: February 2017

Abstract
TbxHo0.9−xNd0.1 (Fe0.8Co0.2)1.93 (0 ⩽ x ⩽ 0.40) particulate composites were prepared by embedding and aligning alloy particles in an epoxy matrix with and without a magnetic curing field. The magnetoelastic properties were investigated as functions of composition, particle volume fraction and macroscopic structure of the composite. The magnetic anisotropy compensation point was found to be around x = 0.25, where the easy magnetization direction (EMD) at room temperature was detected lying along ⟨ 1 1 1 ⟩ axis. The composite with ⟨ 1 1 1 ⟩ preferred orientation and pseudo-1-3 type structure was prepared under an applied magnetic field of 12 kOe. An enhanced magnetoelastic effect and large low-field magnetostriction λa, as high as 430 ppm at 3 kOe, were obtained for Tb0.25Ho0.65Nd0.1 (Fe0.8Co0.2)1.93 composite rod. The value of λa was of 72 % of its polycrystalline alloy (~595 ppm/3 kOe) although it only contained 30 vol.% of the alloy particles. This enhanced effect can be attributed to the larger λ111 (as compared to λ100), low magnetic anisotropy, easy magnetization direction (EMD) along the ⟨ 1 1 1 ⟩ axis and ⟨ 1 1 1 ⟩-textured orientation of the alloy particles as well as the chain-like structure of the composite. The good magnetoelastic properties of the composite, in spite of the fact that it contained only 30 vol.% of the alloy particles with light rare-earth Nd element in the insulating epoxy, would make it a potential material for magnetostriction application.
Double-layer microwave absorber based on nanocrystalline CoFe2O4and CoFe2O4/PANI multi-core/shell composites
Authors: Xu Yewen , Shen Guozhu , Wu Hongyan , Liu Bin , Fang Xumin , Zhang Ding , Zhu Jun 
Published: February 2017

AbstractOrganic-inorganic nano-CoFe2O4/PANI (polyaniline) multi-core/shell composites have been successfully synthesized by chemical oxidative polymerization of aniline. The characterization results showed that the ferrite nanocrystals were efficiently embedded in PANI. The electromagnetic parameters of the composites were measured by a vector network analyser in the frequency range of 2 GHz to 18 GHz. Double-layer absorbers based on the CoFe2O4/PANI composite (matching layer) and calcined CoFe2O4ferrite (absorbing layer) have been designed. The reflection loss of the microwave absorbers of both single layer and double-layer with a total thickness of 2.0 mm and 2.5 mm was calculated according to transmission-line theory. The results indicated that the minimum reflection loss of the CoFe2O4/PANI composite was −19.0 dB at 16.2 GHz at the thickness of 2.0 mm and −23.6 dB at 13.1 GHz at the thickness of 2.5 mm, respectively. The minimum reflection loss for double-layer absorbers reached −28.8 dB at 16.2 GHz at the total thickness of 2.0 mm, and −31.1 dB at 12.8 GHz at the total thickness of 2.5 mm. The absorption bandwidth under −10 dB was 4.2 GHz (13.8 GHz to 18.0 GHz) and 5.5 GHz (10.3 GHz to 15.8 GHz), respectively. The results show that the reflection loss and absorption bandwidth of the double-layer absorbers are obviously enhanced compared to corresponding single layer absorbers.
Polystyrene/magnetite nanocomposite synthesis and characterization: investigation of magnetic and electrical properties for using as microelectromechanical systems (MEMS)
Authors: Omidi Mohammad Hassan , Alibeygi Mahboobeh , Piri Farideh , Masoudifarid Mohammad 
Published: February 2017

AbstractIn this work, a novel polystyrene/Fe3O4nanocomposite prepared byin-situmethod is presented. Magnetic Fe3O4nanoparticles were encapsulated by polystyrene. The FT-IR spectra confirmed polystyrene/Fe3O4nanocomposite preparation. The electrical properties of prepared nanocomposite were investigated by cyclic voltammetry (CV). The CV analysis showed good electrical conductivity of the synthesized nanocomposite. Magnetic properties of the nanocomposite were studied by vibrating sample magnetometer (VSM). The VSM analysis confirmed magnetic properties of the nanocomposite. The morphology and the size of the synthesized nanocomposite were investigated by field emission scanning electron microscope (FESEM). According to the VSM and CV results, such nanocomposite can be used in microelectromechanical systems.
Synthesis and characterization of hollow V2O5 microspheres for supercapacitor electrode with pseudocapacitance
Authors: Zhang Yifu 
Published: February 2017

Abstract
Hollow V2O5 microspheres (HVOM) were fabricated using NH4VO3, ethylene glycol and carbon spheres as the starting materials by a template solvothermal approach and subsequent calcination. The morphology and composition were characterized by field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Brunauer-Emmet-Teller (BET). The results showed that the obtained HVOM were constructed from nanoparticles with rough surface. The electrochemical properties of HVOM as a supercapacitor electrode were investigated by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). HVOM displayed excellent pseudocapacitance property and their specific capacitances were 488 F·g–1, 455 F·g–1, 434 F·g–1 and 396 F·g–1 at the current density of 0.5 A·g–1, 1 A·g–1, 2 A·g–1 and 5 A·g–1, respectively. They also exhibited an excellent energy density of 8.784 × 105 J·kg–1 at a power density of 900 W·kg–1 . The good electrochemical properties of the as-synthesized HVOM make them a promising candidate as a cathode material for supercapacitors.