bluuebunny/crossref_metadata_2025_split huggingface dataset:
Distinctive histopathology and modulation of cytokine production during oral and intraperitonealTrypanosoma cruziY strain infection
Authors: KUEHN CHRISTIAN C. , OLIVEIRA LUIZ GUSTAVO R. , MIRANDA MARIZA ABREU , PRADO JOSÉ CLÓVIS 
Published: February 2014

SUMMARYAcute Chagas disease outbreaks are related to the consumption of food or drink contaminated by triatomine feces, thus making oral infection an important route of transmission. Both vector-borne and oral infections trigger important cardiac manifestations in the host that are related to a dysregulated immune response. The aims of this work were to evaluate possible alterations of lymphocyte CD4+/CD8+sub-populations, Th1 and Th2 cytokines, nitrite concentrations and cardiac histopathology. One group of male Wistar rats was intraperitoneally infected (I.P.) with 1×105metacyclic trypomastigotes of theT. cruziY strain, and another group of Wistar rats was orally infected (O.I.) with 8×105metacyclic trypomastigotes of the same strain. The intraperitoneal infection triggered statistically enhanced parasite and peritoneal macrophage numbers, increased concentrations of NO and IL-12 and elevated cardiac inflammatory foci when compared with the oral infection. However, proliferation of CD4+and CD8+T cells were not statistically different for oral and intraperitoneal routes.
The Late Chalcolithic Pottery from the Sites of Kavaklı and Yumurta Tepe in the Province of Edirne, Eastern Thrace
Authors: Erdoǧu Burçin 
Published: February 2014

Eastern Thrace acts as a land bridge between Southeast Europe and Anatolia. Along this land bridge, it might be expected that there has been movement of objects and materials, transference of ideas, trade, and migrations of peoples between two continents.In 1995 a prehistoric survey was carried out in the province of Edirne, Eastern Thrace, by the University of Thrace, Department of Archaeology. The Late Chalcolithic pottery from Yumurta Tepe und Kavaklı presented here was collected during this survey. This group supplies a missing link in the pottery sequence of Eastern Thrace.
Plant Use in the Mesolithic and its Role in the Transition to Farming
Authors: Zvelebil Marek 
Published: February 2014

The purpose of this paper is to review the current evidence for plant use in Mesolithic Europe and to summarize its implications. In order to do so, four sources of data are examined: macrobotanical remains, palynological data, artefactual evidence, and the human biological record.A prelimary survey of palaeobotanical evidence for plant use in the Mesolithic indicates that the evidence is far more extensive than expected hitherto and that accumulations of plant food, especially of nuts, point to their regular and extensive use. In those areas such as Britain, where a large number of fine-resolution palynological studies have been carried out, the incidence of clearance and burning phases seems to be too high to be explained by acts of nature alone. A good case can be made for deliberate forest clearance and the maintenance of a more open landscape by Late Mesolithic groups as part of a promotional strategy to increase the productivity of nut and fruit trees and shrubs, wetland plants, and possibly native grasses.Artefactual evidence points to a widespread distribution of soil-working tools (hoes and antler mattocks), especially in temperate Europe, and to a greater than expected presence of reaping and grinding equipment, lending conditional support for the existence of a specialized plant processing tool kit for digging, reaping, and plant processing.Palaeopathological evidence indicates the existence of a dietary pattern in the west Mediterranean making extensive use of starchy and carbohydrate foods which resulted in a high caries rate among the Mesolithic population of that area.In discussing the signiftcanse of these four lines of evidence, it is argued that, by the Late Mesolithic, the patterns of plant use support the notion of wild plant food husbandry instead of the incidental and opportunistic use of plants for food which has implicitly been accepted as a norm for the Mesolithic in Europe. Three geographical areas can be identified with their specific pattern of plant use: temperate Europe, Mediterranean Europe, and the south-eastern Balkans/Pontic Steppe. The patterns of plant use suggested in this paper emphasize the additive nature of the adoption of the agro-pastoral Neolithic farming practices in Europe.
Survey and Test Excavations in the Badari Region, Egypt
Authors: Holmes D. L. , Friedman R. F. 
Published: February 2014

More than 70 years ago an early Predynastic culture was discovered in the Badari region near Asyut. It was named the Badarian and it represents the oldest known agricultural tradition in the Nile Valley of Upper Egypt. However, much remains to be learned about the Badarian as well as subsequent Predynastic developments in the region which may be expected to throw light on the adoption of agriculture in the Nile Valley and the rise of the Egyptian state. Consequently, new field investigations were initiated in 1989. A large part of the area was field surveyed and test excavations were carried out at the site of Hemamieh, originally excavated by Gertrude Caton-Thompson in the 1920s and famous for its stratified sequence of Predynastic levels.During the 1989 season, the authors visited 42 sites, the majority of which have Predynastic remains. Most of the Predynastic occurrences date to the Badarian or Gerzean phases. Very little material was seen that could be assigned to the intervening Amratian phase, raising the possibility that elements of the Badarian culture remained prevalent in the Badari region at a time when only the Amratian was represented elsewhere in Upper Egypt. Our test excavations at Hemamieh revealed a stratigraphy similar to that described by Caton-Thompson with cultural deposits sandwiched between a surface scree layer and a cemented Limestone gravel deposit or ‘breccia’. The pottery recovered shows a continuous sequence beginning with the Badarian and ending with the Gerzean. Four radiocarbon dates were also obtained. Two of these are on samples from levels with Badarian ceramics and provide calibrated age estimates spanning c. 4400–4000 BC.
Two Cordoned Urns from Fan y Big, Brecon Beacons, Powys
Authors: Briggs C. Stephen , Britnell William J. , Gibson Alex M. 
Published: February 2014

Late in November 1981, Mr M. Wright of the Danywenallt Centre, Talybont, noticed fragments of prehistoric pottery and an associated cremation burial in an area eroded by walkers in the pathway on Fan y Big (SO 03712057; fig. 1). The site lies at a height of 655 m on one of the denuded spurs of the northern escarpment of the Beacons (pl. 12). The find itself lay next to a small dry-stone beacon about 1 m high, on the knife-edge of the spur and less than 10m away from the precipitous cliffs which drop away for about 100 m to either side. Behind the spur, to the south, is a slight plateau covered in eroding peat hags with a little cotton grass.The ground was frozen at the time of the discovery to a depth of about 3 cm, and the obvious vulnerability of the pottery to destruction by the weather or the passage of human feet necessitated immediate action to preserve it. A small excavation team supervised by C. S. Briggs was hastily assembled to undertake this task in bitter weather several days later.
Usefulness of real-time three-dimensional trans-oesophageal echocardiography for detection of isolated unroofed coronary sinus
Authors: Nakano Yusuke , Iwamoto Mari , Masuda Munetaka 
Published: February 2014

AbstractWe report a case of unroofed coronary sinus not associated with the persistent left superior vena cava. Definite diagnosis of the unroofed coronary sinus was obtained by trans-oesophageal echocardiography, which revealed the unroofed portion with left-to-right shunt. Real-time three-dimensional trans-oesophageal echocardiography could show the whole pictures of the defect, which was useful information for surgical repair.
Asteroseismology with SuperWASP
Authors: Smalley Barry 
Published: February 2014

AbstractThe highly successful SuperWASP planetary transit finding programme has surveyed a large fraction of both the northern and southern skies. There now exists in its archive over 420 billion photometric measurements for more than 31 million stars. SuperWASP provides good quality photometry with a precision exceeding 1% per observation in the approximate magnitude range 9 < V < 12. The archive enables long-baseline, high-cadence studies of stellar variability to be undertaken. An overview of the SuperWASP project is presented, along with results which demonstrate the survey's asteroseismic capabilities.
On the necessity of a new interpretation of the stellar light curves
Authors: Pascual-Granado J. , Garrido R. , Suárez J. C. 
Published: February 2014

AbstractThe power of asteroseismology relies on the ability to infer the stellar structure from the unambiguous frequency identification of the corresponding pulsation mode. Hence, the use of a Fourier transform is in the basis of asteroseismic studies. Nevertheless, the difficulties with the interpretation of the frequencies found in many stars lead us to reconsider whether Fourier analysis is the most appropriate technique to identify pulsation modes. We have found that the data, usually analyzed using Fourier techniques, present a non-analyticity originating from the lack of connectivity of the underlying function describing the physical phenomena. Therefore, the conditions for the Fourier series to converge are not fulfilled. In the light of these results, we examine in this talk some stellar light curves from different asteroseismology space missions (CoRoT, Kepler and SoHO) in which the interpretation of the data in terms of Fourier frequencies becomes difficult. We emphasize the necessity of a new interpretation of the stellar light curves in order to identify the correct frequencies of the pulsation modes.
Blazhko effect in Cepheids and RR Lyrae stars
Authors: Szabó Róbert 
Published: February 2014

AbstractThe Blazhko effect is the conspicuous amplitude and phase modulation of the pulsation of RR Lyrae stars that was discovered in the early 20th century. The field of study of this mysterious modulation has recently been invigorated thanks to the space photometric missions providing long, uninterrupted, ultra-precise time-series data. In this paper I give a brief overview of the new observational findings related to the Blazhko effect, such as extreme modulations, irregular modulation cycles and additional periodicities. I argue that these findings together with dedicated ground-based efforts provide us now with a fairly complete picture and a good starting point to theoretical investigations. Indeed, new, unpredicted dynamical phenomena have been discovered in Blazhko RR Lyrae stars, such as period doubling, high-order resonances, three-mode pulsation and low-dimensional chaos. These led to the proposal of a new explanation to this century-old enigma, namely a high-order resonance between radial modes. Along these lines I present the latest efforts and advances from the theoretical point of view. Lastly, amplitude variations in Cepheids are discussed.
Bisector analysis of RR Lyrae: atmosphere dynamics at different phases
Authors: Guggenberger Elisabeth , Shulyak Denis , Tsymbal Vadim , Kolenberg Katrien 
Published: February 2014

AbstractThis article reports some preliminary results on an analysis of line bisectors of metal absorption lines of RR Lyrae, the prototype of its class of pulsators. The extensive data set used for this study consists of a time series of spectra obtained at various pulsation phases as well as different Blazhko phases. This setup should allow a comparison of the atmospheric behaviour, especially of the function of radial velocity versus depth at differing Blazhko phases, but (almost) identical pulsation phase, making it possible to investigate whether the modulation causes a change in the atmospheric motion of RR Lyrae. While the nature of the Blazhko modulation has often been investigated photometrically and described as a change in the light curve, studies on time series of high resolution spectra are rare. We present for the first time work on line bisectors at different phases of RR Lyr.
Seismic studies of planet-harbouring stars
Authors: Vauclair Sylvie 
Published: February 2014

AbstractDuring the past decades, stellar oscillations and exoplanet searches were developed in parallel, and the observations were done with the same instruments: radial velocity method, essentially with ground-based instruments, and photometric methods (light curves) from space. The same observational data on one star could lead to planet discoveries at large time scales (days to years) and to the detection of stellar oscillations at small time scales (minutes), such as for the star μ Arae. Since the beginning, it seemed interesting to investigate the differences between stars with and without observed planets. Also, a precise determination of the stellar parameters is important to characterize the detected exoplanets. With the thousands of exoplanet candidates discovered by Kepler, automatic procedures and pipelines are needed with large data bases to characterize the central stars. However, precise asteroseismic studies of well-chosen stars are still important for a deeper insight.
Concluding remarks
Authors: Christensen-Dalsgaard Jørgen , Kawaler Steven D. 
Published: February 2014

AbstractWe cannot presume to summarize all of the science we've discussed in the talks, posters, and informal discussions. Here, we discuss a few of the themes that emerged, concentrating on the theoretical basis that Wojtek Dziembowiski and his colleagues have developed and explored over the past 40+ years. We connect those with observational results – especially those from recent ground-based surveys and space-based missions that have revolutionized the study of stellar variability.
Analysis of γ Doradus and δ Scuti stars observed by Kepler
Authors: Bradley Paul A. , Guzik Joyce A. , Miles Lillian F. , Jackiewicz Jason , Uytterhoeven Katrien , Kinemuchi Karen 
Published: February 2014

AbstractThe Kepler spacecraft observed over 2000 faint stars that were part of our Guest Observer proposals. The stars were selected from the Kepler Input Catalog (KIC) to be in or near the γ Doradus or δ Scuti instability strips (8300 K > Teff > 6200 K and 3.6 < log g < 4.7). The Kepler magnitude was <16 and the contamination factor was < 10−2. The goal was to extend the search for “hybrid” δ Sct-γ Dor pulsators to fainter magnitudes. By inspecting the light curves and Fourier transforms, we find 42 δ Sct candidate stars, 299 γ Dor candidates, and 36 “hybrid” candidate stars showing both types of variations.
Rapidly varying A-type stars in the SuperWASP archive
Authors: Holdsworth Daniel L. , Smalley Barry 
Published: February 2014

AbstractThe searches for transiting exoplanets have produced a vast amount of time-resolved photometric data of many millions of stars. One of the leading ground-based surveys is the SuperWASP project. We present the initial results of a survey of over 1.5 million A-type stars in the search for high frequency pulsations using SuperWASP photometry. We are able to detect pulsations down to the 0.5 mmag level in the broad-band photometry. This has enabled the discovery of several rapidly oscillating Ap stars and over 200 δ Scuti stars with frequencies above 50 d−1, and at least one pulsating sdB star. Such a large number of results allows us to statistically study the frequency overlap between roAp and δ Scuti stars and probe to higher frequency regimes with existing data.
Pulsation in extremely low-mass helium stars
Authors: Jeffery C. S. , Saio H. 
Published: February 2014

AbstractWe explore the stability of extremely low-mass stars (M < 0.25 M⊙) across a wide range of composition, effective temperature, and luminosity. We identify the instability boundaries associated with radial oscillations. These are a strong function of both composition and radial order (0 ≤ n ≤ 13). The classical blue edge shifts to higher effective temperature and luminosity with decreasing hydrogen abundance. Higher-order modes are more easily excited, and small islands of instability develop. Short-period oscillations have been discovered in the low-mass pre-white dwarf component of the eclipsing binary J0247–25. If its envelope is depleted in hydrogen, J0247–25B is unstable to intermediate-order p modes. Driving is by the classical κ mechanism operating in the second helium ionization zone. The observed periods, temperature and luminosity of J0247–25B require an envelope hydrogen abundance 0.2 ≤ X ≤ 0.3.
Photometry using Kepler “superstamps” of open clusters NGC 6791 & NGC 6819
Authors: Kuehn Charles A. , Drury Jason , Stello Dennis , Bedding Timothy R. 
Published: February 2014

AbstractThe Kepler space telescope has proven to be a gold mine for the study of variable stars. Unfortunately, Kepler only returns a handful of pixels surrounding each star on the target list, which omits a large number of stars in the Kepler field. For the open clusters NGC 6791 and NGC 6819, Kepler also reads out larger superstamps which contain complete images of the central region of each cluster. These cluster images can potentially be used to study additional stars in the open clusters. We present preliminary results from using traditional photometric techniques to identify and analyze additional variable stars from these images.
Asteroseismology of fast-rotating stars: the example of α Ophiuchi
Authors: Mirouh Giovanni M. , Reese Daniel R. , Lara Francisco Espinosa , Ballot Jérôme , Rieutord Michel 
Published: February 2014

AbstractMany early-type stars have been measured with high angular velocities. In such stars, mode identification is difficult as the effects of fast and differential rotation are not well known. Using fundamental parameters measured by interferometry, the ESTER structure code and the TOP oscillation code, we investigate the oscillation spectrum of α Ophiuchi, for which observations by the MOST satellite found 57 oscillations frequencies. Results do not show a clear identification of the modes and highlight the difficulties of asteroseismology for such stars with a very complex oscillation spectrum.
New analysis of ZZ Ceti star PG 2303+243
Authors: Pakštienė E. , Laugalys V. , Qvam J. , Boyle R. P. 
Published: February 2014

AbstractThe new photometric observations of PG 2303+243 were obtained in 2012 during a campaign carried out with three telescopes. The analysis of these observations is presented in this paper. We identified l = 1 and l = 2 pulsation modes. The pulsation periods were compared with theoretical ones for models of ZZ Ceti stars. This allowed us to estimate the physical parameters of PG 2303+243. The star seems to be cooler and has thicker hydrogen layer than it was thought before. We have derived M*/M⊙ = 0.66, Teff = 11014 K and log(MH/M*)=−4.246 for this star.
Review of the ultrafast time resolution photopolarimeters based on SPADs
Authors: Słowikowska Aga , Kanbach Gottfried , Goździewski Krzysztof , Krzeszowski Krzysztof , Rau Arne 
Published: February 2014

AbstractWe review photopolarimeters that are based on the Single Photon Avalanche Diodes (SPADs) and were designed, built, developed, and extensively used for high time resolution studies of astrophysical sources. Examples of such detectors are OPTIMA, GASP, AquEYE, and IquEYE which can measure the time of arrival of single optical photons with an accuracy of down to 50 picoseconds. We describe the most exciting results obtained with the SPADs detectors starting from the best existing optical polarimetric measurements of the Crab pulsar, the discovery of the first optical magnetar and its quasi-periodic oscillations, as well as a verification of exoplanets around eclipsing cataclysmic variables. Additionally, we discuss possible applications of such detectors for asteroseismology.
Extensive spectroscopic and photometric study of HD 25558, a long orbital-period binary with two SPB components
Authors: Sódor Á. , De Cat P. , Wright D. J. , Neiner C. , Briquet M. , Dukes R. J. , Fekel F. C. , Henry G. W. , Williamson M. H. , Muterspaugh M. W. , Brunsden E. , Pollard K. R. , Cottrell P. L. , Maisonneuve F. , Kilmartin P. M. , Matthews J. M. , Kallinger T. , Beck P. G. , Kambe E. , Engelbrecht C. A. , Czanik R. J. , Yang S. , Hashimoto O. , Honda S. , Fu J.-N. , Castanheira B. , Lehmann H. , Behara N. , Van Winckel H. , Scaringi S. , Menu J. , Lobel A. , Lampens P. , Mathias P. 
Published: February 2014

AbstractWe carried out an extensive photometric and spectroscopic investigation of the SPB binary, HD 25558 (see Fig. 1 for the time and geographic distribution of the observations). The ~2000 spectra obtained at 13 observatories during 5 observing seasons, the ground-based multi-colour light curves and the photometric data from the MOST satellite revealed that this object is a double-lined spectroscopic binary with a very long orbital period of about 9 years. We determined the physical parameters of the components, and have found that both lie within the SPB instability strip. Accordingly, both components show line-profile variations consistent with stellar pulsations. Altogether, 11 independent frequencies and one harmonic frequency were identified in the data. The observational data do not allow the inference of a reliable orbital solution, thus, disentangling cannot be performed on the spectra. Since the lines of the two components are never completely separated, the analysis is very complicated. Nevertheless, pixel-by-pixel variability analysis of the cross-correlated line profiles was successful, and we were able to attribute all the frequencies to the primary or secondary component. Spectroscopic and photometric mode-identification was also performed for several of these frequencies of both binary components. The spectroscopic mode-identification results suggest that the inclination and rotation of the two components are rather different. While the primary is a slow rotator with ~6 d rotation period, seen at ~60° inclination, the secondary rotates fast with ~1.2 d rotation period, and is seen at ~20° inclination. Our spectropolarimetric measurements revealed that the secondary component has a magnetic field with at least a few hundred Gauss strength, while no magnetic field was detected in the primary.The detailed analysis and results of this study will be published elsewhere.
Seismic investigation of the γ Dor star KIC 6462033: The first results of Kepler and ground-based follow up observations
Authors: Ulusoy C. , Ulaş B. , Damasso M. , Carbognani A. , Cenadelli D. , Stateva I. , Iliev I. Kh. , Dimitrov D. 
Published: February 2014

AbstractPreliminary results on the analysis of the Kepler light curve and photometric ground-based time series of γ Dor star KIC 6462033 (TYC 3144-646-1, V = 10.83, P = 0.69686 d) are presented in order to determine pulsation frequencies.
Opposing actions of IL-2 and IL-21 on Th9 differentiation correlate with their differential regulation of BCL6 expression
Authors: Liao Wei , Spolski Rosanne , Li Peng , Du Ning , West Erin E. , Ren Min , Mitra Suman , Leonard Warren J. 
Published: February 2014

SignificanceInterleukin-9 (IL-9) is a γc-family cytokine produced by Th9 cells that regulates a range of immune responses, including allergic inflammation. We show that IL-2 via STAT5 is required for Th9 differentiation. IL-2 inhibits B cell lymphoma 6 (BCL6), which inhibits Th9 differentiation, whereas IL-21 induces BCL6. BCL6 bound near STAT5 and STAT6 binding sites, including at theIl9(gene encoding IL-9) promoter, and BCL6 binding increased and STAT binding decreased after treatment with anti–IL-2/IL-2R. Thus, IL-2 and IL-21 have opposing actions on BCL6 expression, which inversely correlates with Th9 differentiation and IL-9 production, with implications for controlling Th9 differentiation and potentially allergic inflammation.