bluuebunny/crossref_metadata_2025 huggingface dataset:
Electric shock fault diagnosis of low‐voltage residual current‐operated protective device
Authors: Han Xiaohui , Du Songhuai , Su Juan , Liu Guangeng
Published: September 2017

In order to diagnose the electric shock fault types of new‐generation adaptive residual current operated protective devices (RCDs), a combination method based on local mean decomposition (LMD) amount of energy and support vector machine (SVM) is proposed in this study. First, LMD is applied to decompose the original electric shock signals into a finite number of product functions (PFs); then the former PFs containing the main features are selected to calculate the total energy. Second, SVM is used to solve the multi‐class classification problem. The amount of energy of the PF component is considered as the input vector of the SVM, and particle swarm optimization (PSO) is used to optimize the model parameters. Experimental results show that the proposed method is effective in diagnosing animal or plant electric shock fault type, which provides a reliable theoretical basis for developing a new generation of adaptive RCDs. © 2017 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Two reported cytotypes of the emergent orchid model species Erycina pusilla are two different species
Authors: Yeh Hsuan-Yu , Lin Choun-Sea , de Jong Hans , Chang Song-Bin
Published: September 2017

Each species is characterized by a specific set of chromosomes, which is described as the chromosome portrait or karyotype. In general, such a karyotype is the same for all individuals in the population. An exception to that rule has recently been found in the orchid Erycina pusilla, which has been reported to have two cytotypes with chromosome numbers of 2n = 10 and 2n = 12. Here, we examined the karyotypes of the two cytotypes and found differences in arm ratios and heterochromatin patterns as well as in the presence of satellite chromosomes and in the number and location of rDNA and telomeric repeat sites. These differences are extensive and would have required multiple chromosome rearrangements to generate the differences between the two karyotypes. We also found that F1 hybrids between the parents with the two different chromosome numbers resulted in sterile offspring, in accordance with our previous findings. The combination of hybrid sterility and extensively rearranged chromosomes supports the hypothesis that these two reported cytotypes are, in fact, two different species.
Training to Provide Psychiatric Genetic Counseling: How Does It Impact Recent Graduates’ and Current Students’ Readiness to Provide Genetic Counseling for Individuals with Psychiatric Illness and Attitudes towards this Population?
Authors: Low Ashley , Dixon Shannan , Higgs Amanda , Joines Jessica , Hippman Catriona
Published: September 2017

Mental illness is extremely common and genetic counselors frequently see patients with mental illness. Genetic counselors report discomfort in providing psychiatric genetic counseling (GC), suggesting the need to look critically at training for psychiatric GC. This study aimed to investigate psychiatric GC training and its impact on perceived preparedness to provide psychiatric GC (preparedness). Current students and recent graduates were invited to complete an anonymous survey evaluating psychiatric GC training and outcomes. Bivariate correlations (p<.10) identified variables for inclusion in a logistic regression model to predict preparedness. Data were checked for assumptions underlying logistic regression. The logistic regression model for the 286 respondents [χ2(8)=84.87, p<.001] explained between 37.1% (Cox & Snell R2=.371) and 49.7% (Nagelkerke R2=.497) of the variance in preparedness scores. More frequent psychiatric GC instruction (OR=5.13), more active methods for practicing risk assessment (OR=4.43), and education on providing resources for mental illness (OR=4.99) made uniquely significant contributions to the model (p<.001). Responses to open‐ended questions revealed interest in further psychiatric GC training, particularly enabling “hands on” experience. This exploratory study suggests that enriching GC training through more frequent psychiatric GC instruction and more active opportunities to practice psychiatric GC skills will support students in feeling more prepared to provide psychiatric GC after graduation.
Abundance and diversity of soil mite (Acari) communities after conversion of tropical secondary forest into rubber plantations in Grand‐Lahou, Côte d'Ivoire
Authors: N'Dri Julien Kouadio , Seka Fabrice Ange , Pokou Pacôme Konan , N'Da Rodolphe Arnaud Guy , Lagerlöf Jan
Published: September 2017

The objective of this investigation was to understand the modification of mite communities and soil physico‐chemical parameters after conversion of secondary forests into rubber plantations and how these change with the aging of the plantations. The sampling was performed in a humid period and samples were taken from three of each age of secondary forests, 7‐year‐old rubber plantations, 12‐year‐old rubber plantations and 25‐year‐old rubber plantations. We hypothesized that the stress imposed on mite communities during site preparation and planting would be compensated for by the reduction of the soil degradation index as the rubber plantations age. Across the 12 sampling areas, 120 soil cores were taken at 10 cm soil depth over a 40 m transect. Soil physico‐chemical parameters were characterized and soil mites were extracted with a modified Berlese‐Tullgren funnel over the course of 10 days. The results showed that conversion of secondary forests into rubber plantations leads to a modification in the density of mites (−60 and +1%), species richness (−48 and −15%), water content (−62 and −31%), soil organic carbon (−67 and −51%) and total nitrogen (−64 and −52%) respectively after about 7 and 25 years of conversion. The investigation pointed out an improvement in soil ecological quality with the aging of rubber plantations over time and this was characterized by an increase in the density of mites (+150%), species richness (+63%), water content (+84%), organic carbon (+50%) and total nitrogen (+33%) in the 25‐year‐old plantations compared to the 7‐year‐old plantations.
Four strategies to find, evaluate, and engage with online resources in emergency medicine
Authors: Lo Andrea , Shappell Eric , Rosenberg Hans , Thoma Brent , Ahn James , Trueger N. Seth , Chan Teresa M.
Published: September 2017

Despite the rapid expansion of online educational resources for emergency medicine, barriers remain to their effective use by emergency physicians and trainees. This article expands on previous descriptions of techniques to aggregate online educational resources, outlining four strategies to help learners navigate, evaluate, and contribute online. These strategies include 1) cultivating digital mentors, 2) browsing the most popular free open access medical education (FOAM) websites, 3) using critical appraisal tools developed for FOAM, and 4) contributing new online content.
Are we finally making progress with suicide and self-harm? An overview of the history, epidemiology and evidence for prevention
Authors: Kelly B. D.
Published: September 2017

Ireland’s suicide rate is falling, but suicide and self-harm remain substantial societal problems. It is not possible to predict suicide at the level of the individual but good primary care, good mental health care and good social care all likely reduce risk. In terms of targeted interventions, public health measures, such as paracetamol pack size regulations, have the best evidence base to support them. Despite increased public and professional discussion, much remains to be done to provide effective, coordinated support to those at risk of suicide and those bereaved. In 2016, there were up to 300 different groups providing support. Clearly, a coordinated, effective and compassionate approach is needed, linking community and state resources meaningfully with each other. Approaches rooted outside of core mental health services will be vital: addressing alcohol problems and other addictions, reducing homelessness, reforming the criminal justice system and improving social care.
Ichnostratigraphy of the Ediacaran-Cambrian boundary: new insights on lower Cambrian biozonations from the Soltanieh Formation of northern Iran
Authors: Shahkarami Setareh , Mángano M. Gabriela , Buatois Luis A.
Published: September 2017

Strata in the Central Alborz Mountains, northern Iran, are interpreted to show continuous sedimentation from Ediacaran through Cambrian times. The Soltanieh Formation consists of five members: Lower Dolomite, Lower Shale, Middle Dolomite, Upper Shale and Upper Dolomite members. The clastic units (Lower and Upper Shale members) represent sedimentation in distal marine settings, ranging from the shelf to offshore, and contain abundant trace fossils of biostratigraphic utility. Four ichnozones have been recognized. Ichnozone 1, containingHelminthoidichnites tenuis,Helminthopsis tenuis, andCochlichnus anguineus, is early Fortunian based on small shelly fossils, and is interpreted as a distal expression of theTreptichnus pedumzone. Ichnozone 2, comprising the first occurrence ofT.pedum, is middle Fortunian, and is best regarded as the upper half of theTreptichnus pedumZone. Ichnozone 3 is late Fortunian–Cambrian Age 2, characterized by a sudden change in abundance and complexity of trace fossils. Main elements in this ichnozone includeCruziana problematica,Curvolithusisp., Phycodesisp.,Treptichnus pedum,Treptichnus pollardi, andTreptichnusisp. Ichnozone 4 is of Cambrian Age 2–Age 3 and marked by the first appearances ofPsammichnites gigas,Rusophycus avalonensis, andDidymaulichnus miettensis. Integration of trace fossils with small shelly fossils suggests that the Ediacaran–Cambrian boundary should be placed at the base of the Soltanieh Formation or within the Lower Dolomite Member. The delayed appearance ofT.pedumand the low ichnodiversity in the Lower Shale and lower interval of the Upper Shale reflect limited colonization of settings below storm wave base during the early Fortunian.
A quantitative taxonomic review of Fusichonetes and Tethyochonetes (Chonetidina, Brachiopoda)
Authors: Wu Hui-ting , Shi G. R. , He Wei-hong
Published: September 2017

Two middle Permian (Capitanian) to Early Triassic (Griesbachian) rugosochonetidae brachiopod genera, Fusichonetes Liao in Zhao et al., 1981 and Tethyochonetes Chen et al., 2000, have been regarded as two distinct taxa and used as such for a wide range of discussions including biostratigraphy, paleoecology, paleobiogeography, and the Permian-Triassic boundary mass extinction. However, the supposed morphological distinctions between the two taxa are subtle at best and appear to represent two end members of a continuum of morphological variations. In this study, we applied a range of quantitative and analytical procedures (bivariate plots, Kolmogorov-Smirnov test, categorical principle component analysis, and cladistic analysis) to a dataset of 15 quantified morphological variables, integrating both key external and internal characters, measured from 141 specimens of all well-known Fusichonetes and Tethyochonetes in order to test whether or not these two genera could be distinguished in view of the chosen characters. The results indicate that these two genera are morphologically indistinguishable and that the species classification previously applied to these two genera appears to represent polyphyletic groupings within the genus Fusichonetes. Consequently, Tethyochonetes is concluded to be a junior synonym of Fusichonetes. The diagnosis and key characteristics of Fusichonetes are clarified and refined based on a new suite of well-preserved specimens from the Permian−Triassic Xinmin section in South China.
Fish and invertebrate by-catch in the crab pot fishery in the Isle of Man, Irish Sea
Authors: Öndes Fikret , Kaiser Michel J. , Murray Lee G.
Published: September 2017

Baited trap or pot fisheries are considered to have relatively few wider ecosystem effects on the marine environment, particularly when compared with towed mobile fishing gear. However, this assumption is rarely tested in the field. This study aimed to determine the composition of non-target species that occur in crustacean pots and to assess spatial and temporal differences in catches in the waters around the Isle of Man, Irish Sea. The data were collected using fishery independent surveys and a questionnaire study. Based on fishery independent surveys, a total of five taxonomic groups and 43 species occurred as by-catch. The dominant by-catch species was velvet crab Necora puber. The by-catch per unit effort (BPUE) for all of the non-target species was low particularly in comparison to towed bottom gear fisheries around the Isle of Man. BPUE of species composition varied considerably between different locations around the Isle of Man. The results of both the fishery independent and questionnaire data suggested that the by-catch rates varied with season with peak BPUE occurring in spring which then declined into autumn and winter. By-catch composition did not decrease significantly with an increasing target species catch. Overall, by-catch was low relative to target species catch which may be partially attributable to the use of escape panels in pot fisheries in the Isle of Man.
Vaticanus Distigme-obelos Symbols Marking Added Text, Including 1 Corinthians 14.34–5
Authors: Payne Philip B.
Published: September 2017

The two-dot-plus-bar ‘distigme-obelos’ symbols inVaticanussignal added text. Five characteristic features distinguish their obeloi from paragraphoi. Like scribe B's LXX obeloi, all eight distigme-obelos symbols mark the location of added text. A gap at the exact location of a widely recognised, multi-word addition follows every distigme-obelos except one with distinctive downward dipping strokes. TheVaticanusGospels are so early that they have virtually no high stops, a feature older than even75. Consequently, they contain none of these additions, but theVaticanusepistles have high stops throughout and contain their one distigme-obelos-marked addition, 1 Cor 14.34–5. Contemporaneous LXX G has corresponding distigmai.
Writing about music: The selection and arrangement of notation in jazz students’ written texts
Authors: Martin Jodie L.
Published: September 2017

Music notation is intrinsic in the composition and performance of Western art music and also in its analysis and research. The process of writing about music remains underexplored, in particular how excerpts of music notation are selected and arranged in a written text, and how that text describes and contextualises the excerpts. This article applies ‘semantic gravity’ from Legitimation Code Theory to characterise notational excerpts and their integration in a written text, by focusing on how closely they are connected to a particular performance or generalised across performances. It illustrates these concepts with case studies of tertiary students’ research projects to reveal how different purposes drive different notational usage when writing about music. This provides insight for music educators on how to support writing about music and the use of notational quotes.
Word-final consonant epenthesis in Northeastern Nigerian English
Authors: IDIATOV DMITRY
Published: September 2017

L2 speakers of Nigerian English in parts of northeastern Nigeria occasionally insert an alveolar coronal stop [t] or fricative [s] following another alveolar coronal pre-pausally and phrase-internally. The article discusses this typologically unusual phenomenon for the Nigerian English of speakers whose L1 is the Adamawa language Bena (ISO 639-3: yun). I also consider comparable cases of word-final consonant epenthesis in several other varieties of English, both the so-called New Englishes and Inner Circle varieties, and provide an account of the details of epenthesis with respect to which they differ. At first sight, hypercorrection of the tendency for word-final consonant cluster simplification in Bena English may seem an obvious explanation. However, I argue that hypercorrection alone falls short of explaining the observed pattern. In addition, we need to call on phonetic properties of Bena L1 such as pre-pausal glottalisation and lengthening of consonants to be able to account for both the actuation of the hypercorrection and the phonologisation of the epenthesis. Although the availability of a clear phonetic explanation makes this sound pattern conceivable as a natural rule, its typological rarity in non-contact lects highlights the positive bias induced by hypercorrection as a necessary part of the mix in creating the conditions for a reanalysis.
Associations between bottle-feeding intensity and maternal encouragement of bottle-emptying
Authors: Ventura Alison K , Garcia Patsy , Schaffner Andrew A
Published: September 2017

Objective

To explore longitudinal associations between bottle-feeding and maternal encouragement of infant bottle-emptying during the first 6 months of infancy.

Design

Mothers completed questionnaires during the third trimester of pregnancy, then monthly during the first 6 months postpartum. Questionnaires assessed family demographics, maternal and infant weight status, infant feeding patterns and maternal encouragement of infant bottle-emptying.

Setting

The Infant Feeding Practices Study 2, conducted by the US Centers for Disease Control and Prevention and the Food and Drug Administration.

Subjects

Mothers (n1776).

Results

Repeated-measures regression was used to explore associations between bottle-feeding intensity (BFI; defined as the percentage of daily feedings that were from a bottle) and encouragement of bottle-emptying. Mothers who reported consistently high or consistently low BFI also exhibited consistently higher or lower frequency of encouraging their infants to empty the bottle (respectively) across the first 6 months of infancy, whereas mothers who reported increases in their BFI also exhibited concomitant increases in the frequency to which they encouraged their infants to finish the bottle. More frequent encouragement of bottle-emptying was also associated with feeding expressed breast milk (P<0·001), and lower parity (P=0·01), pre-pregnancy BMI (P=0·002) and infant birth weight (P=0·001).

Conclusions

More frequent use of bottles for infant feeding was significantly associated with more frequent encouragement of bottle-emptying. Further research using causal designs is needed to better understand whether the use of bottles promotes this controlling feeding practice or whether mothers with more controlling feeding practices opt to bottle-feed.
Quantitative Studies of Endothelial Cell Fibronectin and Filamentous Actin (F-Actin) Coalignment in Response to Shear Stress
Authors: Gong Xianghui , Zhao Xixi , Li Bin , Sun Yan , Liu Meili , Huang Yan , Jia Xiaoling , Ji Jing , Fan Yubo
Published: September 2017

Both fibronectin (FN) and filamentous actin (F-actin) fibers play a critical role for endothelial cells (ECs) in responding to shear stress and modulating cell alignment and functions. FN is dynamically coupled to the F-actin cytoskeleton via focal adhesions. However, it is unclear how ECs cooperatively remodel their subcellular FN matrix and intracellular F-actin cytoskeleton in response to shear stress. Current studies are hampered by the lack of a reliable and sensitive quantification method of FN orientation. In this study, we developed a MATLAB-based feature enhancement method to quantify FN and F-actin orientation. The role of F-actin in FN remodeling was also studied by treating ECs with cytochalasin D. We have demonstrated that FN and F-actin codistributed and coaligned parallel to the flow direction, and that F-actin alignment played an essential role in regulating FN alignment in response to shear stress. Our findings offer insight into how ECs cooperatively remodel their subcellular ECM and intracellular F-actin cytoskeleton in response to mechanical stimuli, and are valuable for vascular tissue engineering.
Introduction: Migration and Differential Labour Market Participation
Authors: Netto Gina , Craig Gary
Published: September 2017

Recent major political developments, including Brexit and the US presidential elections, have been strongly associated with public concerns around levels of immigration. Much of this has centred on the role of migrants in the low-skilled sectors of the economy and concerns that they have displaced members of local communities from jobs and depressed wage levels. This is despite compelling evidence that immigrants rarely take jobs from native workers in OECD countries (Constant, 2014) and that in the long run, the wage and employment effects of immigration in the 1990s and in the 2000s were small and always positive for less educated workers of all OECD countries (Docquieret al., 2014). Recent UK specific studies have found that the impact on wages is considered to be relatively small (Dustmannet al., 2013; Nickell and Salaheen, 2015). Notwithstanding this evidence, hostility to migrants and migration more generally has become increasingly overt, as reflected in a substantial rise in ‘race’ hate crimes before and following the referendum on the UK's membership of the EU in 2016 (Burnett, 2017).
Some Useful Sources
Authors: Flynn Don
Published: September 2017

Networks and projects around the theme of migrants in the labour market can be discussed under the following headings:

1.

Trade union-based initiatives

2.

Migrant community-based initiatives

3.

Issues of acknowledged concern that generate national responses (forced labour, trafficked workers, undocumented migrant workers, etc.).
Studies of synoptic solar activity using Kodaikanal Ca K data
Authors: Raju K. P.
Published: September 2017

The chromospheric network, the bright emission network seen in the chromospheric lines such as Ca ii K and Hα, outline the supergranulation cells. The Ca images are dominated by the chromospheric network and plages which are good indicators of solar activity. Further, the Ca line is a good proxy to the UV irradiance which is particularly useful in the pre-satellite era where UV measurements are not available. The Ca spectroheliograms of the Sun from Kodaikanal have a data span of about 100 years and covers over 9 solar cycles. The archival data is now available in the digitized form. Programs have been developed to obtain the activity indices and the length scales of the chromospheric network from the data. The preliminary results from the analysis are reported here. It is shown that the Ca ii K intensity and the network boundary width are dependent on the solar cycle.
The Influences of Stellar Activity on Planetary Atmospheres
Authors: Johnstone Colin P.
Published: September 2017

On evolutionary timescales, the atmospheres of planets evolve due to interactions with the planet's surface and with the planet's host star. Stellar X-ray and EUV (=’XUV’) radiation is absorbed high in the atmosphere, driving photochemistry, heating the gas, and causing atmospheric expansion and mass loss. Atmospheres can interact strongly with the stellar winds, leading to additional mass loss. In this review, I summarise some of the ways in which stellar output can influence the atmospheres of planets. I will discuss the importance of simultaneously understanding the evolution of the star's output and the time dependent properties of the planet's atmosphere.
Modelling coronal electron density and temperature profiles based on solar magnetic field observations
Authors: Gómez J. M. Rodríguez , Vieira L. E. Antunes , Lago A. Dal , Palacios J. , Balmaceda L. A. , Stekel T.
Published: September 2017

The density and temperature profiles in the solar corona are complex to describe, the observational diagnostics is not easy. Here we present a physics-based model to reconstruct the evolution of the electron density and temperature in the solar corona based on the configuration of the magnetic field imprinted on the solar surface. The structure of the coronal magnetic field is estimated from Potential Field Source Surface (PFSS) based on magnetic field from both observational synoptic charts and a magnetic flux transport model. We use an emission model based on the ionization equilibrium and coronal abundances from CHIANTI atomic database 8.0. The preliminary results are discussed in details.
Nickel-Phosphorous Development for Total Solar Irradiance Measurement
Authors: Carlesso F. , Berni L. A. , Vieira L. E. A. , Savonov G. S. , Nishimori M. , Lago A. Dal , Miranda E.
Published: September 2017

The development of an absolute radiometer instrument is currently a effort at INPE for TSI measurements. In this work, we describe the development of black Ni-P coatings for TSI radiometers absorptive cavities. We present a study of the surface blackening process and the relationships between morphological structure, chemical composition and coating absorption. Ni-P deposits with different phosphorous content were obtained by electroless techniques on aluminum substrates with a thin zincate layer. Appropriate phosphorus composition and etching parameters process produce low reflectance black coatings.
Evolution of the Active Region NOAA 12443 based on magnetic field extrapolations: preliminary results
Authors: Chicrala André , Dallaqua Renato Sergio , Vieira Luis Eduardo Antunes , Lago Alisson Dal , Gómez Jenny Marcela Rodríguez , Palacios Judith , Stekel Tardelli Ronan Coelho , Costa Joaquim Eduardo Rezende , da Silva Rockenbach Marlos
Published: September 2017

The behavior of Active Regions (ARs) is directly related to the occurrence of some remarkable phenomena in the Sun such as solar flares or coronal mass ejections (CME). In this sense, changes in the magnetic field of the region can be used to uncover other relevant features like the evolution of the ARs magnetic structure and the plasma flow related to it. In this work we describe the evolution of the magnetic structure of the active region AR NOAA12443 observed from 2015/10/30 to 2015/11/10, which may be associated with several X-ray flares of classes C and M. The analysis is based on observations of the solar surface and atmosphere provided by HMI and AIA instruments on board of the SDO spacecraft. In order to investigate the magnetic energy buildup and release of the ARs, we shall employ potential and linear force free extrapolations based on the solar surface magnetic field distribution and the photospheric velocity fields.
The influence of eclipses in the stellar radio emission
Authors: Selhorst Caius Lucius , Valio Adriana
Published: September 2017

Here we simulate the shape of a planetary transit observed at radio wavelengths. The simulations use a light curve of the K4 star HAT-P-11 and its hot Jupiter companion as proxy. From the HAT-P-11 optical light curve, a prominent spot was identified (1.10 RP and 0.6 IC). On the radio regime, the limb brighting of 30% was simulated by a quadratic function, and the active region was assumed to have the same size of the optical spot. Considering that the planet size is 6.35% of the the stellar radius, for the quiet star regions the transit depth is smaller than 0.5%, however, this value can increase to ~2% when covering an active region with 5.0 times the quiet star brightness temperature.
The long-term evolution of stellar activity
Authors: Gregory Scott G.
Published: September 2017

I review the evolution of low-mass stars with outer convective zones over timescales of millions-to-billions of years, from the pre-main sequence to solar-age, ~4.6 Gyr (Bahcallet al.1995; Amelinet al.2010), and beyond. I discuss the evolution of high-energy coronal and chromospheric emission, the links with stellar rotation and magnetism, and the emergence of the rotation-activity relation for stars within young clusters.
Rossby numbers of fully convective and partially convective stars
Authors: Landin Natália R. , Mendes Luiz T. S.
Published: September 2017

In this work, we investigate the stellar magnetic activity in the theoretical point of view, through the use of stellar structure and evolution models. We present theoretical values of convective turnover times and Rossby numbers for low-mass stars, calculated with the ATON stellar structure and evolution code. We concentrate our analysis on fully convective and partially convective stars motivated by recent observations of X-ray emission of slowly rotating fully convective stars, which suggest that the presence of a tachocline is not a central key for magnetic fields generation. We investigate the behavior of the convective turnover time evolution, as well as its radial profile inside the star. A discussion about the location where the convective turnover time is calculated in the stellar interior is also addressed. Our theoretical results are compared to observational data from low-mass stars.
Magnetic fields of weak line T-Tauri stars
Authors: Hill Colin A. ,   the MaTYSSE Collaboration
Published: September 2017

T-Tauri stars (TTS) are late-type pre-main-sequence (PMS) stars that are gravitationally contracting towards the MS. Those that possess a massive accretion disc are known as classical T-Tauri stars (cTTSs), and those that have exhausted the gas in their inner discs are known as weak-line T-Tauri stars (wTTSs). Magnetic fields largely dictate the angular momentum evolution of TTS and can affect the formation and migration of planets. Thus, characterizing their magnetic fields is critical for testing and developing stellar dynamo models, and trialling scenarios currently invoked to explain low-mass star and planet formation. The MaTYSSE programme (Magnetic Topologies of Young Stars and the Survival of close-in Exoplanets) aims to determine the magnetic topologies of ~30 wTTSs and monitor the long-term topology variability of ~5 cTTSs. We present several wTTSs that have been magnetically mapped thus far (using Zeeman Doppler Imaging), where we find a much wider range of field topologies compared to cTTSs and MS dwarfs with similar internal structures.
Differential rotation of stars with multiple transiting planets
Authors: Netto Yuri , Valio Adriana
Published: September 2017

If a star hosts a planet in an orbit such that it eclipses the star periodically, can be estimated the rotation profile of this star. If planets in multiplanetary system occult different stellar areas, spots in more than one latitude of the stellar disc can be detected. The monitored study of theses starspots in different latitudes allow us to infer the rotation profile of the star. We use the model described in Silva (2003) to characterize the starspots of Kepler-210, an active star with two planets. Kepler-210 is a late K star with an estimated age of 350 ± 50 Myrs, average rotation period of 12.33 days, mass of 0.63 M⊙ and radius of 0.69 R⊙. The planets that eclipses this star have radii of 0.0498 Rs and 0.0635 Rs with orbital periods of 2.4532 ± 0.0007 days and 7.9725 ± 0.0014 days, respectively, where Rs is the star radius.
Solar Radius at Sub-Terahertz Frequencies
Authors: Menezes Fabian , Valio Adriana
Published: September 2017

The visible surface of the Sun, or photosphere, is defined as the solar radius in the optical spectrum range located at 696,000 km (Cox et al. (Ed. 2015)). However, as the altitude increases, the dominant electromagnetic radiation is emitted at other frequencies. Our aim is to measure the solar radius at frequencies of 212 GHz and 405 GHz through out a solar cycle and, therefore, the altitude where these emissions are generated and that variation along the years. Also we tried to verify the the radius dependence on the solar activity cycle, which can be a good indicator of the changes that occur in the atmosphere structure. For this, we used data obtained by the Submillimetric Solar Telescope (SST) created from daily scans made by SST from 1990 to 2015. From these scans a 2D map of the solar disk was constructed. The solar radius is then determined by adjusting a circumference to the points where the brightness is half of the quiet Sun level, which is set as the most common temperature value in the solar map, i.e., the mode of the temperature distribution. Thus, we determined the solar radius at 212 and 405 GHz and the altitude of the emissions respectively. For 212 GHz, we obtained a radius of 976.5”±8” (707±4 Mm), whereas for 405 GHz, we obtained 975.0”±8” (707±5 Mm). optical spectrum range
An Eruptive Complex Solar Flare and Events in its Aftermath
Authors: Luoni M.L. , Francile C. , Mandrini C. H. , Cremades H.
Published: September 2017

We present a study of the M6.6 flare that occurred on 13 February 2011 in AR 11158. The flare was accompanied by a CME and EUV waves. We use multiwavelength observations from the ground: H-alpha Solar Telescope for Argentina (HASTA), and space: Helioseismic and Magnetic Imager (HMI) and Atmospheric Imaging Assembly (AIA), both onboard the Solar and Dynamic Observatory (SDO).
Observable Impacts of Exoplanets on Stellar Hosts – An X-Ray Perspective
Authors: Wolk Scott J. , Pillitteri Ignazio , Poppenhaeger Katja
Published: September 2017

Soon after the discovery of hot Jupiters, it was suspected that interaction of these massive bodies with their host stars could give rise to observable signals. We discuss the observational evidence for star-planet interactions (SPI) of tidal and magnetic origin observed in X-rays. Hot Jupiters can significantly impact the activity of their host stars through tidal and magnetic interaction, leading to either increased or decreased stellar activity – depending on the internal structure of the host star and the properties of the hosted planet. We provide several examples of these interactions. In HD 189733, the strongest X-ray flares are preferentially seen in a very restricted range of planetary phases. Hot Jupiters, can also obscure the X-ray signal during planetary transits. Observations of this phenomena have led to the discovery of a thin upper atmospheres in HD 189733A. On the other hand, WASP-18 – an F6 star with a massive hot Jupiter, shows no signs of activity in X-rays or UV. Several age indicators (isochrone fitting, Li abundance) point to a young age (~0.5 – −1.0 Gyr) and thus significant activity was expected. In this system, tidal SPI between the star and the very close-in and massive planet appears to disrupt the surface shear layer and thus nullify the stellar activity.
A new look at sunspot formation using theory and observations
Authors: Losada I. R. , Warnecke J. , Glogowski K. , Roth M. , Brandenburg A. , Kleeorin N. , Rogachevskii I.
Published: September 2017

Sunspots are of basic interest in the study of the Sun. Their relevance ranges from them being an activity indicator of magnetic fields to being the place where coronal mass ejections and flares erupt. They are therefore also an important ingredient of space weather. Their formation, however, is still an unresolved problem in solar physics. Observations utilize just 2D surface information near the spot, but it is debatable how to infer deep structures and properties from local helioseismology. For a long time, it was believed that flux tubes rising from the bottom of the convection zone are the origin of the bipolar sunspot structure seen on the solar surface. However, this theory has been challenged, in particular recently by new surface observation, helioseismic inversions, and numerical models of convective dynamos. In this article we discuss another theoretical approach to the formation of sunspots: the negative effective magnetic pressure instability. This is a large-scale instability, in which the total (kinetic plus magnetic) turbulent pressure can be suppressed in the presence of a weak large-scale magnetic field, leading to a converging downflow, which eventually concentrates the magnetic field within it. Numerical simulations of forced stratified turbulence have been able to produce strong super-equipartition flux concentrations, similar to sunspots at the solar surface. In this framework, sunspots would only form close to the surface due to the instability constraints on stratification and rotation. Additionally, we present some ideas from local helioseismology, where we plan to use the Hankel analysis to study the pre-emergence phase of a sunspot and to constrain its deep structure and formation mechanism.
The X-ray Light-Curves and CME onset of a M2.5 flare of July 6, 2006
Authors: Mendoza-Torres J. E. , Pérez-León J. E.
Published: September 2017

A M2.5 solar flare observed by RHESSI in the 6-100 keV range on July 6, 2006 led to a Coronal Mass Ejection (CME). Two compact sources at 12-100 keV are seen at the beginning of the flare, whose further evolution fits well in a loop. Also, time-profiles of the flare at radio wavelengths are compared. The X-ray light-curves at different bands in the 6-100 keV range and radio time profiles show some peaks superimposed on smooth variations. The aim of this work is to compare the X-ray light-curves, of fluxes integrated over the whole source, with the physical parameters of the sources of the flare. Yashiro and Gopalswamy (2009) have found that the fraction of flares that produce CME increases with the flare energy. Here, we look for the characteristics of an M2.5 flare that could make it a generator of a CME. The idea is, in future works, to look in the light-curves of similar flares at other stars for these features. It is found that the CME onset takes place around the time when an X-ray source at 12-25 keV of Chromospheric evaporation stagnates at the loop apex, before the main peak at the light-curve at 25-50 keV and at the radio emission curves. Probably, the amount of evaporated plasma could play some role in triggering the CME.
The Faint Young Sun and Faint Young Stars Paradox
Authors: Martens Petrus C.
Published: September 2017

The purpose of this paper is to explore a resolution for the Faint Young Sun Paradox that has been mostly rejected by the community, namely the possibility of a somewhat more massive young Sun with a large mass loss rate sustained for two to three billion years. This would make the young Sun bright enough to keep both the terrestrial and Martian oceans from freezing, and thus resolve the paradox. It is found that a large and sustained mass loss is consistent with the well observed spin-down rate of Sun-like stars, and indeed may be required for it. It is concluded that a more massive young Sun must be considered a plausible hypothesis.
Interaction of extra solar planets with their host star
Authors: Silva Douglas , Valio Adriana
Published: September 2017

Transit is the passage of the planet in front of its star. During one of these transits, the planet may occult a spot on the photosphere of the star, causing small variations in its light curve. By detecting the same spot in a later transit, it is possible to estimate the stellar rotation period. The comparison between the rotation period of star at the equator and the planets orbital period showed the existence of resonances between these periods. Two types of mechanisms are proposed in the literature: electromagnetic interaction between the stellar and planetary fields and gravitational interaction. Our results have shown that for planets CoRoT-2b, CoRoT-5b and CoRoT-8b, tidal effects seem to dominate, whereas for planets CoRoT-4b and CoRoT-6b electromagnetic interaction dominates over tidal effects. A distinct characteristic of these last two systems is that the orbital period is larger than the rotation period of the star.
What can He II 304 Å tell us about transient seismic emission from solar flares?
Authors: Lindsey C. , Donea A. C.
Published: September 2017

After neary 20 years since their discovery by Kosovichev and Zharkova, the mechanics of the release of seismic transients into the solar interior from some flares remain a mystery. Seismically emissive flares invariably show the signatures of intense chromosphere heating consistent with pressure variations sufficient to drive seismic transients commensurate with helioseismic observations—under certain conditions. Magnetic observations show the signatures of apparent magnetic changes, suggesting Lorentz-force transients that could likewise drive seismic transients—similarly subject to certain conditions. But, the diagnostic signatures of both of these prospective drivers are apparent over vast regions from which no significant seismic emission emanates. What distinguishes the source regions of transient seismic emission from the much vaster regions that show the signatures of both transient heating and magnetic variations but are acoustically unproductive? Observations of acoustically active flares in He II 304 Å by the Atomospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory (SDO) offer a promising new resource with which to address this question.
Following Carbon in an Age of Fire
Authors: Thompson Elizabeth
Published: September 2017

As fires become more prevalent in California, researchers work to create a profile of the charred carbon left behind.
IHC-based subcellular quantification provides new insights into prognostic relevance of FLIP and procaspase-8 in non-small-cell lung cancer
Authors: Hutchinson Ryan A , Coleman Helen G , Gately Kathy , Young Vincent , Nicholson Siobhan , Cummins Robert , Kay Elaine , Hynes Sean O , Dunne Philip D , Senevirathne Seedevi , Hamilton Peter W , McArt Darragh G , Longley Daniel B
Published: September 2017

In this study, we developed an image analysis algorithm for quantification of two potential apoptotic biomarkers in non-small-cell lung cancer (NSCLC): FLIP and procaspase-8. Immunohistochemical expression of FLIP and procaspase-8 in 184 NSCLC tumors were assessed. Individual patient cores were segmented and classified as tumor and stroma using the Definiens Tissue Studio. Subsequently, chromogenic expression of each biomarker was measured separately in the nucleus and cytoplasm and reported as a quantitative histological score. The software package pROC was applied to define biomarker thresholds. Cox proportional hazards analysis was applied to generate hazard ratios (HRs) and associated 95% CI for survival. High cytoplasmic expression of tumoral (but not stromal) FLIP was associated with a 2.5-fold increased risk of death in lung adenocarcinoma patients, even when adjusted for known confounders (HR 2.47, 95% CI 1.14–5.35). Neither nuclear nor cytoplasmic tumoral procaspase-8 expression was associated with overall survival in lung adenocarcinoma patients; however, there was a significant trend (P for trend=0.03) for patients with adenocarcinomas with both high cytoplasmic FLIP and high cytoplasmic procaspase-8 to have a multiplicative increased risk of death. Notably, high stromal nuclear procaspase-8 expression was associated with a reduced risk of death in lung adenocarcinoma patients (adjusted HR 0.31, 95% CI 0.15–0.66). On further examination, the cells with high nuclear procaspase-8 were found to be of lymphoid origin, suggesting that the better prognosis of patients with tumors with high stromal nuclear procaspase-8 is related to immune infiltration, a known favorable prognostic factor. No significant associations were detected in analysis of lung squamous cell carcinoma patients. Our results suggest that cytoplasmic expression of FLIP in the tumor and nuclear expression of procaspase-8 in the stroma are prognostically relevant in non-small-cell adenocarcinomas but not in squamous cell carcinomas of the lung.
Regulation of hnRNPA1 by microRNAs controls the miR-18a–K-RAS axis in chemotherapy-resistant ovarian cancer
Authors: Rodriguez-Aguayo Cristian , Monroig Paloma del C , Redis Roxana S , Bayraktar Emine , Almeida Maria I , Ivan Cristina , Fuentes-Mattei Enrique , Rashed Mohammed H , Chavez-Reyes Arturo , Ozpolat Bulent , Mitra Rahul , Sood Anil K , Calin George A , Lopez-Berestein Gabriel
Published: September 2017

The regulation of microRNA (miRNA) biogenesis, function and degradation involves a range of mechanisms, including interactions with RNA-binding proteins. The potential contribution of regulatory miRNAs to the expression of these RNA interactor proteins that could control other miRNAs expression is still unclear. Here we demonstrate a regulatory circuit involving oncogenic and tumor-suppressor miRNAs and an RNA-binding protein in a chemotherapy-resistant ovarian cancer model. We identified and characterized miR-15a-5p and miR-25-3p as negative regulators of hnRNPA1 expression, which is required for the processing of miR-18a-3p, an inhibitor of the K-RAS oncogene. The inhibition of miR-25-3p and miR-15a-5p decreased the proliferation, motility, invasiveness and angiogenic potential and increased apoptosis when combined with docetaxel. Alteration of this regulatory circuit causes poor overall survival outcome in ovarian cancer patients. These results highlight miR-15a-5p and miR-25-3p as key regulators of miR-18a-3p expression and its downstream target K-RAS, through direct modulation of hnRNPA1 expression. Our results demonstrate the therapeutic potential of inhibiting miR-25-3p and miR-15a-5p and the use of miR-18a-3p/KRAS ratio as a prominent outcome prognostic factor.
The Apostasia genome and the evolution of orchids
Authors: Zhang Guo-Qiang , Liu Ke-Wei , Li Zhen , Lohaus Rolf , Hsiao Yu-Yun , Niu Shan-Ce , Wang Jie-Yu , Lin Yao-Cheng , Xu Qing , Chen Li-Jun , Yoshida Kouki , Fujiwara Sumire , Wang Zhi-Wen , Zhang Yong-Qiang , Mitsuda Nobutaka , Wang Meina , Liu Guo-Hui , Pecoraro Lorenzo , Huang Hui-Xia , Xiao Xin-Ju , Lin Min , Wu Xin-Yi , Wu Wan-Lin , Chen You-Yi , Chang Song-Bin , Sakamoto Shingo , Ohme-Takagi Masaru , Yagi Masafumi , Zeng Si-Jin , Shen Ching-Yu , Yeh Chuan-Ming , Luo Yi-Bo , Tsai Wen-Chieh , Van de Peer Yves , Liu Zhong-Jian
Published: September 2017

Constituting approximately 10% of flowering plant species, orchids (Orchidaceae) display unique flower morphologies, possess an extraordinary diversity in lifestyle, and have successfully colonized almost every habitat on Earth1,2,3. Here we report the draft genome sequence of Apostasia shenzhenica4, a representative of one of two genera that form a sister lineage to the rest of the Orchidaceae, providing a reference for inferring the genome content and structure of the most recent common ancestor of all extant orchids and improving our understanding of their origins and evolution. In addition, we present transcriptome data for representatives of Vanilloideae, Cypripedioideae and Orchidoideae, and novel third-generation genome data for two species of Epidendroideae, covering all five orchid subfamilies. A. shenzhenica shows clear evidence of a whole-genome duplication, which is shared by all orchids and occurred shortly before their divergence. Comparisons between A. shenzhenica and other orchids and angiosperms also permitted the reconstruction of an ancestral orchid gene toolkit. We identify new gene families, gene family expansions and contractions, and changes within MADS-box gene classes, which control a diverse suite of developmental processes, during orchid evolution. This study sheds new light on the genetic mechanisms underpinning key orchid innovations, including the development of the labellum and gynostemium, pollinia, and seeds without endosperm, as well as the evolution of epiphytism; reveals relationships between the Orchidaceae subfamilies; and helps clarify the evolutionary history of orchids within the angiosperms.