327,808 research outputs found
Long-term orbital period behaviour of contact binaries V343 Ori and FZ Ori
No full text32nd International Physics Congress of Turkish-Physical-Society (TPS) -- SEP 06-09, 2016 -- Bodrum, TURKEYIn this study, we investigated orbital period variations of two contact binaries V343 Ori and FL Ori based on published minima times. Using the O-C analysis, it was found that both systems indicate orbital period increase. Mass transfer from less massive component to more massive component was used to explain increases in the orbital periods. On the other hand, the secular changes in their periods can be a sign of the thermal relaxation oscillation. In the O-C diagram of FL Ori, periodic variations also exist. Cyclic periodic changes can be explained as being the result of a light travel time effect via a tertiary body around the eclipsing pair. The minimum mass of probable tertiary component around FL Ori was found to be 0.63 M-circle dot. In addition, the cyclic variation may be evidence of magnetic activity of the components, which are late-type stars.Turkish Phys So
Laboratorio di preparazione
No full textIl volume presenta una sintesi delle analisi preparatorie per il Piano strategico dell'Associazione dei Comuni del Copparese, approvato e pubblicato nel 2004. Sono inclusi nel volume numerosi numeri della rivista "Piano strategico News" curata nel periodo 2002-2004 da G. Ave come coordinatore scietifico del Piano e dai membri del Comitato Tecnico Scientifico costituito da P. Bianchi, A. Gandini, U. Marano, D. Ori, P. Persico, D. Rubini, C. Sapigni, M. Tedeschi, A. Ulian
Ori-Finder: A web-based system for finding s in unannotated bacterial genomes-1
No full textEr.<p><b>Copyright information:</b></p><p>Taken from "Ori-Finder: A web-based system for finding s in unannotated bacterial genomes"</p><p>http://www.biomedcentral.com/1471-2105/9/79</p><p>BMC Bioinformatics 2008;9():79-79.</p><p>Published online 1 Feb 2008</p><p>PMCID:PMC2275245.</p><p></p
Ori-Finder: A web-based system for finding s in unannotated bacterial genomes-0
No full textEgrated plot as a PNG figure for the original sequence and (C) the integrated plot as a PNG figure for the rotated sequence, displaying the obtained results, such as general genome information, four disparity curves, distribution of DnaA boxes, locations of putative indicator genes and the predicted region. Note that the coordinate origin of the rotated sequence begins and ends in the maximum of the GC disparity curve.<p><b>Copyright information:</b></p><p>Taken from "Ori-Finder: A web-based system for finding s in unannotated bacterial genomes"</p><p>http://www.biomedcentral.com/1471-2105/9/79</p><p>BMC Bioinformatics 2008;9():79-79.</p><p>Published online 1 Feb 2008</p><p>PMCID:PMC2275245.</p><p></p
Apsidal motion of two eclipsing binaries: V796 Cyg and V2783 Ori
No full text32nd International Physics Congress of Turkish-Physical-Society (TPS) -- SEP 06-09, 2016 -- Bodrum, TURKEYIn this study, the orbital period variations of two eclipsing binary systems showing apsidal motion were studied. Their O - C diagrams were analysed using all reliable eclipse timings and the elements of apsidal motion of two systems were improved. We found periods of apsidal motion of V796 Cyg and V2783 Ori to be 32.7 +/- 0.2 years and 415 +/- 50 years, respectively.Turkish Phys So
New constraints on the membership of the T dwarf S Ori 70 in the
No full textAims.The nature of S Ori 70 (S Ori J053810.1-023626), a faint mid-T type
object found towards the direction of the young σ Orionis cluster, is still
under debate. We intend to find out whether it is a field brown dwarf
or a 3-Myr old planetary-mass member of the cluster.
Methods.We report on near-infrared and mid-infrared [3.6] and [4.5]
IRAC/Spitzer photometry recently obtained for S Ori 70. The new
near-infrared images (taken 3.82 yr after the discovery data) allowed
us to derive the first proper motion measurement for this object.
Results.The colors , and Ks - [3.6] appear
discrepant when compared to T4–T7 dwarfs in the field. This behavior
could be ascribed either to a low-gravity atmosphere or to an
atmosphere with a metallicity that is significantly different than
solar. The small proper motion of
S Ori 70 (11.0 ± 5.9 mas yr-1) indicates that this object is
farther away than expected if it were a single field T dwarf lying in
the foreground of the σ Orionis cluster. Our measurement is consistent with
the proper motion of the cluster within 1.5σ the astrometric
uncertainty.
Conclusions.Taking into account both S Ori 70's proper motion and the new near- and
mid-infrared colors, a low-gravity atmosphere remains as the most
likely explanation for our observations. This supports S Ori 70's
membership in σ Orionis, with an estimated mass in the interval 2–7 MJup, in
agreement with our previous derivation
Te Ao Hurihuri population: Past, present & future
No full textThe NIDEA Te Ao Hurihuri series uses data from the New Zealand Census of Population and Dwellings to examine key aspects of Maori population change
Māori Identity and Reflexive Ethnography in Research on HORI’s Art
No full textThis article presents a multidimensional analysis of the work of the Māori artist Hori from postcolonial, cultural, and autoethnographic perspectives. Drawing on the researcher’s experience as a visitor in Ōtaki, Aotearoa/New Zealand, an environment deeply rooted in Māori heritage, the text demonstrates how Hori’s art becomes a field of negotiation over identity, visual decolonization, and dialogue with global currents of socially engaged art. Particular attention is given to Matariki, the Māori New Year, as a context for cultural renewal, community strengthening, and the emphasis on values such as whakapapa (genealogy) and whenua (land). Through the author’s autoethnographic reflexivity, interpretation emerges as a relational process that takes into account local meanings, universal experiences of resistance, as well as the ethical and epistemological challenges involved in researching Indigenous cultures. In effect, Hori’s work appears as a transnational visual language in which aesthetics intertwines with politics and local epistemologies engage with global discourses on power, memory, and identity
The discovery of SycO reveals a new function for type three secretion effector chaperones
No full textThe Type Three Secretion (T3S) system is a device used by many Gram-negative pathogens that allows bacteria to deliver effector proteins straight into the eukaryotic cell cytosol. These effectors interfere with various signaling pathways to subvert the host cell functions. The secretion machinery of the T3S system consist of a basal body spanning the bacterial inner and outer membrane followed by a stiff hollow needle outside the bacterium. The fully assembled secretion apparatus constitute a continuous hollow conduit that connects the bacteria to the eukaryotic target cell. After cell contact, virulence proteins -called effectors- are injected directly into the cytosol of the host cell via the T3S apparatus. Several effectors of the T3S system require the assistance of specific cytosolic chaperones to be efficiently exported. There are three classes of T3S chaperones. Effector proteins are assisted by Class I chaperones. Although Class I chaperones are well characterized, their main function is still a matter of controversy. In this thesis, we demonstrate that orf155 encodes a specific chaperone for the effector YopO that we called SycO. We showed that SycO enhances YopO secretion in vitro and is required for translocation of YopO into infected cells. By pulldown assay we demonstrated that residues 20 to 77 of YopO are required and sufficient for SycO binding. Using crosslinking experiments and size exclusion chromatography analysis, we determined the stoichiometry of purified SycO and YopO-SycO complexes. SycO alone forms dimers in solution and the YopO-SycO complex has a 1:2 stoichiometry. These results suggested that SycO is a typical chaperone of the Class I. YopO is a serine/theronine kinase that interacts with Rho and Rac and disrupts the cytoskeleton of the target cells. YopO has been shown to localize at the cell plasma-membrane. By transfection of YopO-EGFP hybrid proteins into HEK293T cells, we demonstrated that the chaperone-binding domain (CBD) coincides with the membrane localization domain of YopO. Nevertheless, the CBD was not needed for the kinase activity of YopO. By ultracentrifugation, we also showed that the CBD causes YopO aggregation in the bacteria, when SycO does not cover it. Further, we show that the CBD of YopE and YopT also caused aggregation in the bacteria in the absence of SycE and SycT respectively. YopE, YopT and T3S effectors in other systems also act at the membrane of the eukaryotic host cell. We propose a new hypothesis concerning the role of T3S chaperones. The sub-cellular localization domain of effectors is aggregation-prone and creates the need for a chaperone inside bacteria. We propose that masking such aggregation-prone localization domains may be a general function for type III effector chaperones
S Ori J053825.4-024241: a classical T Tauri-like object at the substellar boundary
No full textWe present a spectrophotometric analysis of S Ori
J053825.4-024241, a candidate member close to the substellar
boundary of the young (1–8 Myr), nearby (~360 pc)
σ Orionis star cluster. Our optical and near-infrared
photometry and low-resolution spectroscopy
indicate that S Ori J053825.4-024241 is a likely cluster
member with a mass estimated from evolutionary models at
0.06 , which makes the object
a probable brown dwarf.
The radial velocity of S Ori J053825.4-024241 is similar
to the cluster systemic velocity.
This target, which we have
classified as an M 6..0 low-gravity object, shows excess
emission in the near-infrared and anomalously strong
photometric variability for its type (from the blue
to the J band), suggesting the presence of a surrounding
disc. The optical spectroscopic observations show a
continuum excess at short wavelengths and a persistent and
resolved Hα emission (pseudo-equivalent width of
~-250 Å) in addition to the presence of other
forbidden and permitted emission lines, which we interpret as
indicating accretion from the disc and possibly mass loss. We
conclude that despite the low mass of S Ori
J053825.4-024241, this object exhibits some of the
properties typical of active classical T Tauri stars.
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