bluuebunny/crossref_metadata_2025_split huggingface dataset:
Brown Dwarf Kinematics Project (BDKP)
Authors: Faherty J. , Cruz K. , Burgasser A. , Walter F. , Shara M. 
Published: July 2008

AbstractWe report on the progress of the Brown Dwarf Kinematics Project (BDKP), which aims to measure the 6D positions and velocities of all known brown dwarfs within 20 pc of the Sun and select sources of scientific interest. In this paper we report on the status of the 33 targets on our parallax list as well as the results of our proper motion survey where we have measured over 400 new proper motions for known late M, L and T dwarfs.
Non-tidal vertical variations and the past star catalogs
Authors: Li Z. X. 
Published: July 2008

AbstractTidal vertical variations have been removed in astrometric observations, but the non-tidal ones remain unknown. From the repeated observations of gravimetric networks in China, the non-tidal vertical variations at Beijing-Tangshan and West Yunnan are determined, which are of the order of 0.″2. Astrometric results, including past star catalogs, based on these observations should be corrected.
Application of MGC method to centering saturated and stretched images
Authors: Mao Y. D. , Li Y. , Tang Z. H. 
Published: July 2008

AbstractSometimes saturated and stretched star images with bad data in their central parts may result in astronomical CCD observations. Considering the special characteristics of the saturated and stretched star images, a method known as MGC(Mean-Geometric-Centering) is put forward for determining the centers of these images. The basic principles and processing pipelines of MGC are introduced, and several noteworthy items in the realization of MGC are discussed. Results of applying MGC to simulated and real data are also presented.
A compiled catalogue of reference stars around the selected ERS in the northern sky
Authors: Ryl'kov V. P. , Narizhnaja N. , Dement'eva A. , Maigurova N. , Pinigin G. I. , Protsyuk Y. 
Published: July 2008

AbstractA compiled catalogue consisting of more than 22000 reference stars in the range of 10m – 16m obtained with 235 fields of δ from −17° to +80° around extragalactic radio sources (ERS) selected from the ICRF list. Initial catalogues were obtained from photographic (PG) and CCD observations.
Astrometry with ALMA: a giant step from 0.1 arcsecond to 0.1 milliarcsecond in the sub-millimeter
Authors: Lestrade J.-F. 
Published: July 2008

AbstractWe discuss astrometric capabilities of the future interferometer ALMA that will be located at a high altitude site (5000m) in Northern Chile to operate in the sub-millimeter range. In this paper, we estimate the astrometric precision of ALMA to be ~0.18 milliarcsecond at the optimum observing frequency of 345 GHz from an error budget including the thermal noise and the systematic errors caused by uncertainties in antenna coordinates, reference source coordinates, Earth orientation parameters, dry atmosphere parameter and by phase fluctuations due to moisture above the site. We briefly discuss three applications: first, astrometric search of exoplanets around 446 nearby stars detectable by ALMA; second, proper motions and parallaxes of pre-stellar cores and protostars; third, the rotation rate of the debris disk around ε Eri to test the theory of dust trapping in mean motion resonances with unseen planets.
The Chinese VLBI network and its astrometric role
Authors: Li J. L. , Guo L. , Zhang B. 
Published: July 2008

AbstractIn this report we present the current status of the Chinese VLBI network (CVN), and the results of satellite tracking experiments in the past few years related to realtime processing of the CVN dataflow and the reliability and precision of the CVN measurements. We briefly outline the prospective astrometric roles of CVN in the studies of long-term monitoring of extragalactic radio sources, densification of radio celestial reference frame, determination of Earth Orientation Parameters and linkage parameters of reference frames as well as the observation of pulsars for deep space autonomous navigation.
The distance to an outer Galaxy star forming region
Authors: Hachisuka K. , Brunthaler A. , Reid M. J. , Menten K. M. 
Published: July 2008

AbstractWe performed phase-referencing VLBI astrometric observations of the H2O maser source IRAS 02395+6244, located well beyond the solar circle. We measured its heliocentric distance to be 5.49 ± 0.80 kpc, implying a Galactocentric distance of 12.5 ± 0.5 kpc and a distance of 270 ± 40 pc above the Galactic plane.
Astrometry with SIM PlanetQuest
Authors: Shao M. 
Published: July 2008

AbstractSIM PlanetQuest is a very high accuracy space astrometric instrument based on a long baseline stellar interferometer. For global astrometry SIM was designed to be accurate to ≈ 4μas(microarcsec) after a 5 year mission. For narrow angle astrometry (≈ 1000 s integration over a 1° radius field) SIM is designed for 1μas precision. The technology program was completed in 2005 and based on laboratory results, the current best estimate of SIM's performance would be 0.6 μas for narrow angle precision and 2.4 μas for global accuracy. This paper describes a variety of science programs that the SIM science team have proposed to conduct from a search for one Earth mass planets in the habitable zone of (≈130) nearby stars to the study of dark matter in the galactic disk, the galactic halo and the local group.
Measuring proper motions of galactic dwarf galaxies with Hubble Space Telescope
Authors: Piatek S. , Pryor C. 
Published: July 2008

AbstractOver the past several years, our research group has been measuring proper motions for nearby dwarf satellite galaxies using data taken with the Hubble Space Telescope. In order to measure proper motions with an expected size of several tens of milliarcseconds per century using a time baseline of 2-4 years, our work required that positions of stars and QSOs be measured to an accuracy of ~0.25 mas (~0.005 pixel). This contribution reviews the scientific justification of this work and our methodology. It concludes with a few general results and future directions.
CTE in Space Astrometry
Authors: Kozhurina-Platais V. , Sirianni M. , Chiaberge M. 
Published: July 2008

AbstractAn imperfect CTE in CCD detectors is one of the most important instrumental issues affecting both photometry and astrometry, especially in space-based observations. We discuss the CTE effect in the images taken with the Hubble Space Telescope's, Advanced Camera for Surveys in Wide Field Channel (ACS/WFC). ACS is the only imaging instrument capable of delivering sub-mas astrometry from a single observation, and it is important to take into account any instrumental systematic in positions such as the CTE effect.
A Star Image Extractor for the Nano-JASMINE satellite
Authors: Yamauchi M. , Gouda N. , Kobayashi Y. , Tsujimoto T. , Yano T. , Suganuma M. , Yamada Y. , Nakasuka S. , Sako N. 
Published: July 2008

AbstractWe have developped a software of Star-Image-Extractor (SIE) which works as the on-board real-time image processor. It detects and extracts only the object data from raw image data. SIE has two functions: reducing image data and providing data for the satellite's high accuracy attitude control system.
Astrometric microlensing with the RadioAstron space mission
Authors: Zakharov A. F. 
Published: July 2008

AbstractAccording to a revised schedule of the Russian Space Agency, in October 2008 the 10 m space telescope RadioAstron will be launched in a high eccentric orbit around the Earth. Acting together with ground based radio telescopes, the VLBI interferometer with a ground-space arm will operate. The interferometer will have extraordinary angular resolution of a few microarcsecond (μas) at the shortest wavelength (1.35 cm). Since typical angular scales for gravitational microlensing are at the μas level for cosmological locations of sources and microlenses, in principle there is a chance to resolve microimages and (or) at least, detect astrometrical shift of bright point like images. In particular, gravitationally lensed systems, such as B1600+434, where in radio band a signature of microlensing is found, look suitable for direct observations of microlensing, since microlensing with the RadioAstron interferometer may be detected in the future (considering its high angular resolution and a relatively high sensitivity and assuming a ground support by the advanced radio telescopes).
The luminosity function of nearby thick-disk sub-dwarfs
Authors: Arifyanto M. I. 
Published: July 2008

AbstractWe derived the luminosity function of thick disk using V/Vmax method for nearby sub-dwarf stars based on the sample stars of Carney et al. (1994). Hipparcos parallaxes and proper motions and Tycho2 proper motions were combined with radial velocities and metallicities from CLLA. We found that the luminosity function in the absolute magnitude range MV = 4–6 mag agree well with the luminosity function derived from the initial mass function (Reyle & Robin 2001).
Age-Metallicity Relation, [Fe/H] and [α/Fe] vertical gradients in the Milky Way from the SDSS–DR5 spectroscopic database
Authors: Morossi C. , Franchini M. , Di Marcantonio P. , Malagnini M. L. 
Published: July 2008

AbstractSpectra of FGK stars were selected from the SDSS–DR5 spectroscopic database to investigate the Age-Metallicity relation and the [Fe/H] and [α/Fe] vertical gradients in the Milky Way. Atmospheric parameters and [α/Fe] were derived by comparing synthetic and measured Lick/SDSS spectral indices. Results were checked and complemented by analyzing solar neighbourhood stars. Spectroscopic distances and ages were obtained for a subsample of ~2000 stars using theoretical isochrones via a Bayesian approach. The resulting Age-Metallicity diagram and the [Fe/H] and [α/Fe] vertical gradients are presented.
TW Hydrae astrometric parameters measurement
Authors: Teixeira R. , Ducourant C. , Chauvin G. , Krone-Martins A. G. O. , le Campion J.-F. , Song I. , Zuckerman B. 
Published: July 2008

AbstractThe primary goal of this study was measurement of trigonometric parallaxes and proper motions of a dozen members of the TW Hydrae Association (TWA) that are not present in the Hipparcos catalogue.
Hipparcos data supporting the IB school curriculum
Authors: O'Flaherty K. S. , Brumfitt A. , Lawton C. 
Published: July 2008

AbstractThe Hipparcos and Tycho catalogues are ideal data sources for classwork since they provide real data illustrating fundamental astronomical concepts in a simple and easy to manipulate format. In this poster we describe how some of this data is used as support material within the International Baccalaureate (IB) science curriculum. The preparation and deployment of a series of Teacher Notes, specifically constructed to support the IB but applicable to other curricula, is described. Specific attention is given to the Teacher Notes on Stellar Distances which employs data from the Hipparcos and Tycho catalogues.
The extended solar neighborhood: precision astrometry from the Pan-STARRS 1 3π Survey
Authors: Magnier E. A. , Liu M. , Monet D. G. , Chambers K. C. 
Published: July 2008

AbstractThe Pan-STARRS pathfinding telescope PS1 will begin a major set of surveys starting in 2008, and lasting for 3.5 years. One of these, the PS1 3π Survey, will repeatedly observe the entire sky north of −30 degrees, visiting every position 12 times in each of 5 filters. With single-epoch astrometry of 10 milliarcseconds, these observations will yield parallaxes for stars within 100 pc and proper motions out to several hundred pc. The result will be an unprecedented view on nearby stellar populations and insight into the dynamical structure of the local portions of the Galaxy. One exciting science product will be a volume-limited sample of nearby low-mass objects including thousands of L dwarfs, hundreds of T dwarfs, and perhaps even cooler sub-stellar objects. Another project will use proper-motion measurements to improve the membership of nearby star forming regions.
PMOE planetary/lunar ephemeris framework
Authors: Li G. Y. , Zhao H. B. , Xia Y. , Zeng F. , Luo Y. J. 
Published: July 2008

AbstractThe PMOE planetary/lunar ephemeris framework was established in 2003, and has been improved in recent years. In the framework of the post-Newtonian effects, the figure perturbation effects arising from the a finite size of the Sun, Moon and the Earth, and the effect of the Earth tide were taken into account. The accuracy of using the PMOE ephemeris to predict the positions of the planets in the solar system are the same as that of JPL DE 405. Based on this framework, the orbit optimization for the LISA, ASTROD and ASTROD I missions, and the computation of celestial phenomena and lunar phases in the Xia Shang and Zhou period of ancient China have been completed.
Getting ready for the micro-arcsecond era
Authors: Brown A. G. A. 
Published: July 2008

AbstractAs the title of this symposium implies, one of the aims is to examine the future of astrometry as we move from an era in which thanks to the Hipparcos Catalogue everyone has become familiar with milliarcsecond astrometry to an era in which microarcsecond astrometry will become the norm. I will take this look into the future by first providing an overview of present astrometric programmes and how they fit together and then I will attempt to identify the most promising future directions. In addition I discuss the important conditions for the maximization of the scientific return of future large and highly accurate astrometric catalogues; catalogue access and analysis tools, the availability of sufficient auxiliary data and theoretical knowledge, and the education of the future generation of astrometrists.
Area Postrema
Authors:   Allen Institute for Brain Science, Glattfelder Katie , Ng Lydia , Morris John 
Published: July 2008

AbstractThis report contains a gene expression summary of the area postrema (AP), derived from the "Allen Brain Atlas":http://www.brain-map.org/welcome.do;jsessionid=EDE40ADC940845D169DE378ADC9B71BD (ABA) in-situ hybridization (ISH) mouse data set. The structure’s location and morphological characteristics in the mouse brain are described using the Nissl data found in the "Allen Reference Atlas":http://www.brain-map.org/mouse/atlas/coronal/legend.html. Using an established algorithm, the expression values of the AP were compared to the values of the macro/parent-structure, in this case the medulla, for the purpose of extracting regionally specific gene expression data. The highest ranking ratios were then manually curated and verified. The 50 Select Genes were compiled for expression characterization. The experimental data for each gene may be accessed via the links provided; complementary sagittal data may also be accessed using the "ABA":http://www.brain-map.org/welcome.do. Correlation between gene expression in the AP and the rest of the brain, across all genes in the coronal dataset (~4300 genes), were derived computationally and are presented below. A gene ontology table (derived from DAVID Bioinformatics Resources 2007) is also included, highlighting possible functions of these 50 Select Genes.
Up‐regulation of cathepsin B expression and enhanced secretion in mitochondrial DNA‐depleted osteosarcoma cells
Authors: Hamer Isabelle , Delaive Edouard , Dieu Marc , Abdel‐Sater Fadi , Mercy Ludovic , Jadot Michel , Arnould Thierry 
Published: July 2008

Background information. mtDNA (mitochondrial DNA) mutations that impair oxidative phosphorylation can contribute to carcinogenesis through the increased production of reactive oxygen species and through the release of proteins involved in cell motility and invasion. On the other hand, many human cancers are associated with both the up‐regulation and the increased secretion of several proteases and heparanase. In the present study, we tried to determine whether the depletion in mtDNA could modulate the expression and/or the secretion of some lysosomal hydrolases in the 143B osteosarcoma cells, as these mtDNA‐depleted cells are characterized by a higher degree of invasiveness than the parental cells.Results. In comparison with the parental cells, we measured a higher amount of procathepsin B in the conditioned culture medium of the 143B cells lacking mtDNA (ρ0 143B cells), as well as a rise in the specific activity of intracellular cathepsin B. In addition, we observed an activation of the transcription factor NF‐κB (nuclear factor κB) in the cells devoid of functional mitochondria. Finally, we demonstrated that the down‐regulation of the NF‐κB p65 subunit by RNA interference led to a reduction in cathepsin B expression in ρ0 143B cells.Conclusions. The up‐regulation of cathepsin B by NF‐κB, followed by its secretion into the extracellular environment, might be partly responsible for the previously reported invasiveness of the mtDNA‐depleted 143B osteosarcoma cells.
Raman microspectrometry sulfur detection and characterization in the marine ectosymbiotic nematode Eubostrichus dianae (Desmodoridae, Stilbonematidae)
Authors: Himmel David , Maurin Leslie Candice , Gros Olivier , Mansot Jean‐Louis 
Published: July 2008

Background information. Marine nematodes belonging to the Stilbonematidae (Desmodoridae) family are described as living in obligatory association with sulfur‐oxidizing chemoautotrophic ectosymbionts. The symbiotic bacteria carrying out this chemosynthesis should contain elemental sulfur in periplasmic granules as sulfur granules of chemoautotrophic endosymbionts described in various marine invertebrates.Results. Based on TEM (transmission electron microscopy) analyses, extracellular bacteria surrounding Eubostrichus dianae possess these spherical periplasmic granules. Few investigative techniques can be used to identify elemental sulfur, S8, such as EDXS (energy dispersive X‐ray spectroscopy) and EELS (electron energy loss spectroscopy), which are associated with cryo‐fixation of the sample to avoid sulfur loss. These techniques are time consuming, expensive and require technical skills. Raman microspectrometry applied to the analysis of E. dianae allowed us to detect elemental sulfur, S8, and confirmed the location of these sulfur clusters in the bacterial coat. In the same way, Raman spectrometry was positively applied to the endosymbiotic bivalve Codakia orbicularis, suggesting that this technique can be used to characterize sulfur in ecto‐ as well as in endo‐symbiotic sulfur‐oxidizing bacteria.Conclusions. As Raman spectrometry can be used on living organisms (without preliminary fixation) without sample damage and preserving the molecular structure of the sulfur (denatured during chemical fixation), it represents a very well‐adapted investigative tool for biologists. This technique therefore permits us to detect quickly and easily (in a few seconds and on entire living animals) the presence of sulfur compounds in the symbiotic nematode.
FindPeaks 3.1: a tool for identifying areas of enrichment from massively parallel short-read sequencing technology
Authors: Fejes Anthony P. , Robertson Gordon , Bilenky Mikhail , Varhol Richard , Bainbridge Matthew , Jones Steven J. M. 
Published: July 2008

Abstract
Summary: Next-generation sequencing can provide insight into protein–DNA association events on a genome-wide scale, and is being applied in an increasing number of applications in genomics and meta-genomics research. However, few software applications are available for interpreting these experiments. We present here an efficient application for use with chromatin-immunoprecipitation (ChIP-Seq) experimental data that includes novel functionality for identifying areas of gene enrichment and transcription factor binding site locations, as well as for estimating DNA fragment size distributions in enriched areas. The FindPeaks application can generate UCSC compatible custom ‘WIG’ track files from aligned-read files for short-read sequencing technology. The software application can be executed on any platform capable of running a Java Runtime Environment. Memory requirements are proportional to the number of sequencing reads analyzed; typically 4 GB permits processing of up to 40 million reads.
Availability: The FindPeaks 3.1 package and manual, containing algorithm descriptions, usage instructions and examples, are available at http://www.bcgsc.ca/platform/bioinfo/software/findpeaks Source files for FindPeaks 3.1 are available for academic use.
Contact: afejes@bcgsc.ca
Seeking Help for Disaster Services After a Flood
Authors: Stimpson Jim P. , Wilson Fernando A. , Jeffries Shawn K. 
Published: July 2008

ABSTRACTObjectives:This article describes how the frequency of exposure to a flood is associated with the probability of seeking help from agencies (eg, Federal Emergency Management Agency, Red Cross) that provide disaster-related services. The article also describes the population characteristics for the people who are most likely to seek help for disaster services.Methods:Prospective cohort data from 1735 respondents of the Iowa Health Poll were used. Multivariate logistic regression was used to model the odds of seeking help from any agency for flood-related problems.Results:Overall, most people, regardless of flood exposure, did not seek help from disaster service agencies. Disaster services were sought by 23% of respondents who experienced 1 flood, 31% who have experienced 2 floods, and 26% who have experienced 3 or more floods. Multivariate adjusted odds of seeking help were associated with number of flood experiences (odds ratio [OR] 1.58), white race (OR 0.24), economic hardship (OR 1.43), urban residence (OR 0.43), and social support (OR 0.55).Conclusions:On average, the probability of seeking disaster relief services increases with the number of flood experiences. Racial/ethnic minorities, rural residents, economically challenged individuals, and people with low levels of perceived social support may be more likely than people without these characteristics to seek services. (Disaster Med Public Health Preparedness. 2008;2:139–141)
Seven in Absentia Proteins Affect Plant Growth and Nodulation inMedicago truncatula
Authors: Den Herder Griet , De Keyser Annick , De Rycke Riet , Rombauts Stephane , Van de Velde Willem , Clemente María R. , Verplancke Christa , Mergaert Peter , Kondorosi Eva , Holsters Marcelle , Goormachtig Sofie 
Published: July 2008

AbstractProtein ubiquitination is a posttranslational regulatory process essential for plant growth and interaction with the environment. E3 ligases, to which the seven in absentia (SINA) proteins belong, determine the specificity by selecting the target proteins for ubiquitination. SINA proteins are found in animals as well as in plants, and a small gene family with highly related members has been identified in the genome of rice (Oryza sativa), Arabidopsis (Arabidopsis thaliana), Medicago truncatula, and poplar (Populus trichocarpa). To acquire insight into the function of SINA proteins in nodulation, a dominant negative form of the Arabidopsis SINAT5 was ectopically expressed in the model legume M. truncatula. After rhizobial inoculation of the 35S:SINAT5DN transgenic plants, fewer nodules were formed than in control plants, and most nodules remained small and white, a sign of impaired symbiosis. Defects in rhizobial infection and symbiosome formation were observed by extensive microscopic analysis. Besides the nodulation phenotype, transgenic plants were affected in shoot growth, leaf size, and lateral root number. This work illustrates a function for SINA E3 ligases in a broad spectrum of plant developmental processes, including nodulation.