1,732,216 research outputs found
The ISO/LWS spectrum of the Egg nebula, AFGL 2688
No full textWe present an ISO Long Wavelength Spectrometer (LWS) grating spectrum of the carbon-rich proto-planetary nebula AFGL 2688 between 43 and 194μm. The far-infrared spectrum of AFGL 2688 is dominated by strong rotational transitions of CO which are detected from J=14-13 up to J=23-22. The atomic fine structure lines [O I] and [C II] are not detected. This is consistent with the cool central star of AFGL 2688 not having yet photodissociated the molecular gas ejected during the AGB phase. The far-infrared CO emission in AFGL 2688 appears to originate in shocked dense gas at a temperature of ~400K
A spectral line survey of CRL 2688 in the RANGE of 85-116 GHz
No full textA spectral line survey of the proto-planetary nebula CRL 2688 was carried out in the frequency range of 85-116 GHz with the 14 m radio telescope at the Taeduk Radio Astronomy Observatory. Eight detected molecules are all carbon bearing molecules: HCN, HNC, C2H, HC3N, CS, CCS, CN, and CO, and their isotopic species H13CN and 13CO. A CCS line was newly detected in CRL 2688. The molecular lines detected in CRL 2688 were also compared with those of the proto-typical AGB star IRC +10216. The SiS (J = 5-4, v = 0) molecular line detected in IRC +10216 was not detected in CRL 2688, indicating a lower abundance of the SiS molecule in CRL 2688 than in IRC +10216. Excitation temperatures and column densities of HC3N in both CRL 2688 and IRC +10216 were derived using standard LTE rotational diagram analysis. The HC3N column density of CRL 2688 was found to be lower than that of IRC +10216. This fact, together with the lower abundance of the SiS molecule in CRL 2688, may be related to the chemical evolution of the circumstellar envelope of CRL 2688. © 2008. The American Astronomical Society. All rights reserved
A role for SUMO modification in transcriptional repression and activation
No full textSince the discovery of the SUMO (small ubiquitin-related modifier) family of proteins just over a decade ago, a plethora of substrates have been uncovered including many regulators of transcription. Conjugation of SUMO to target proteins has generally been considered as a repressive modification. However, there are now a growing number of examples where SUMOylation has been shown to activate transcription. Here, we discuss whether there is something intrinsically repressive about SUMOylation, or if the outcome of this modification in the context of transcription will prove to be largely substrate-dependent. We highlight some of the technical challenges that will be faced by attempting to answer this question
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Skiles, Henry Hamilton, 1832-1889 (SC 2688)
No full textFinding aid only for Manuscripts Small Collection 2688. Correspondence and other professional papers of Henry Hamilton Skiles, an attorney of Warren County, Kentucky, relating mainly to Civil War claims, courts martial, and applications for release of prisoners of war. Other letters relate to an impressment of a slave to work on the fortifications at Bowling Green, Kentucky, a slave’s travel in Kentucky with a Michigan regiment, and compensation claims for the loss of slaves in Warren County, Kentucky
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
FIGURES 23 in Taxonomic revision of the ant genus Leptomyrmex Mayr (Hymenoptera: Formicidae) 2688
No full textFIGURES 23. Known macro-Leptomyrmex queens: a) L. cnemidatus, b) L. fragilis, c) L. mjobergi, d) L. rufipes, e) L. rufithorax, f) L. tibialis, g) L. wiburdi.Published as part of Lucky, Andrea & Ward, Philip S., 2010, Taxonomic revision of the ant genus Leptomyrmex Mayr (Hymenoptera: Formicidae) 2688, pp. 1-67 in Zootaxa 2688 (1) on page 14, DOI: 10.11646/zootaxa.2688.1.1, http://zenodo.org/record/630003
FIGURE 43 in Taxonomic revision of the ant genus Leptomyrmex Mayr (Hymenoptera: Formicidae) 2688
No full textFIGURE 43. Simplified cladogram depicting relationships within the genus Leptomyrmex. Triangles represent species complexes not fully resolved by molecular phylogenetic analyses; AU = Australia, NC = New Caledonia, NG = New Guinea (modified from Lucky, in press).Published as part of Lucky, Andrea & Ward, Philip S., 2010, Taxonomic revision of the ant genus Leptomyrmex Mayr (Hymenoptera: Formicidae) 2688, pp. 1-67 in Zootaxa 2688 (1) on page 25, DOI: 10.11646/zootaxa.2688.1.1, http://zenodo.org/record/630003
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