197,624 research outputs found
Challenger Memorial
No full textA black and white negative of a memorial held at East Texas State University for the astronauts who were on board the Challenger spacecraft when it exploded. The image shows people in uniform standing near the flags in front of the McDowell Administration Building.https://lair.etamu.edu/scua-univ-photos-browse-all/2545/thumbnail.jp
Bioprospecting: Evolutionary implications from a post-olmec pharmacopoeia and the relevance of widespread taxa
No full textEthnopharmacological relevance: ‘‘Nothing in biology makes sense except in the light of evolution’’ 1 The
historical legacy and relevance of ethnopharmacology in drug discovery is undisputed. Here we connect
the parameters influencing the selection of plant derived medicines by human culture with the concept
of evolution.
Aim of the study: In the present contribution we compare global data with local data and try to answer
the questions, to what extent are the taxonomic clades included in indigenous pharmacopoeias
associated with certain ailment groups, and to what extent can ecology and phylogeny, which we
consider a proxy for chemical relatedness and convergence, account for the observed bias?
Materials and methods: We use an approximated chi-square test (w2) to check for associations between
12 ethnomedical use-categories and 15 taxonomical clades. With cluster analyses we test for
correlations between phylogeny and use-categories. We compare the 67 drug-productive families
identified by Zhu et al.,2 with the medicinal flora of the Popoluca and the APG database and compare
our results with the phylogenetic target classes evidenced by Zhu et al. Furthermore, we compare the
medicinal flora of the Popoluca with the world’s weeds (cf. Holm et al.)3 and discuss our results in
relation to anthropological rationales for plant selection.
Results: The null-hypothesis ‘‘species from the 15 taxonomic clades are selected proportionally to their
share in the treatment of the twelve organ- and symptom-defined use-categories’’ is rejected.
The cluster dendrogram for the clades shows that the use patterns are to a certain extent associated
with Angiosperm phylogeny. With the occurrence of 53 families the 67 drug-productive families are
overrepresented in the regional flora of the Popoluca. The importance of these families in terms of their
share is even more pronounced with the medicinal flora holding around 70% of all individual Popoluca
informant responses.
Conclusions: The overall phylogenetic use pattern is influenced by both the inherent pharmacological
properties, which depend on phylogeny, biogeography, ecology and ultimately allelopathy, and on
culture-specific perception of organoleptic properties. The comparison of the 67 drug-productive
Viridiplantae families with the ethnopharmacopoeia of the Popoluca and the APG database, shows that
‘‘traditional’’ pharmacopoeias and plant-derived drugs are obtained from widespread and species-rich
taxa. This is not a function of family size alone. We put forward the theory that as a function of evolution, widespread taxa contain a broader range of accumulated ecological information and
response encoded in their genes relative to locally occurring taxa. This information is expressed
through the synthesis of allelochemicals with a wide ecological radius, showing broad-spectrum biotaspecific
interactions, including the targeting of proteins of mammals and primates
Identification of Voters with Interest Groups Improves the Electoral Chances of the Challenger
No full textThis short paper investigates the consequences of voters identifying with special interest groups in a spatial model of electoral competition. We show that, by effectively coordinating voting behavior, identification with interest groups leads to an increase in the size of the winning set, that is, the set of policy platforms for the challenger that will defeat the incumbent. Consequently, our paper points at a novel process through which interest groups can enhance the electoral chances of a challenger.
The forgotten Narrative of H. M. S. Challenger and the implications for decapod nomenclature
No full textFroglia, Carlo, Clark, Paul F. (2011): The forgotten Narrative of H. M. S. Challenger and the implications for decapod nomenclature. Zootaxa 2788: 45-56, DOI: 10.5281/zenodo.20063
Implosion in the Challenger Deep: echo sounding with the shock wave
No full text© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Loranger, S., Barclay, D., & Buckingham, M. Implosion in the Challenger Deep: echo sounding with the shock wave. Oceanography, 34(2), (2021), https://doi.org/10.5670/oceanog.2021.201.Since HMS Challenger made the first sounding in the Mariana Trench in 1875, scientists and explorers have been seeking to establish the exact location and depth of the deepest part of the ocean. The scientific consensus is that the deepest depth is situated in the Challenger Deep, an abyss in the Mariana Trench with depths greater than 10,000 m. Since1952, when HMS Challenger II, following its namesake, returned to the Mariana Trench, 20 estimates (including the one from this study) of the depth of the Challenger Deep have been made. The location and depth estimates are as diverse as the methods used to obtain them; they range from early measurements with explosives and stopwatches, to single- and multibeam sonars, to submersibles, both crewed and remotely operated. In December 2014, we participated in an expedition to the Challenger Deep onboard Schmidt Ocean Institute’s R/V Falkor and deployed two free-falling, passive-acoustic instrument platforms, each with a glass-sphere pressure housing containing system electronics. At a nominal depth of 9,000 m, one of these housings imploded, creating a highly energetic shock wave that, as recorded by the other instrument, reflected multiple times from the sea surface and seafloor. From the arrival times of these multi-path pulses at the surviving instrument, in conjunction with a concurrent measurement of the sound speed profile in the water column, we obtained a highly constrained acoustic estimate of the Challenger Deep: 10,983 ± 6 m.This work was funded by the Schmidt Ocean Institute, the Ocean Frontiers Institute, and the Office of Naval Research, Ocean Acoustics, Code 322OA, grant number N00014-18-1-2126
Report on the scientific results of the voyage of H. M. S. Challenger during the years 1873-1876 under the command of Captain George S. Nares and the late Captain Frank Tourie Thomson, R. N. /
No full textVol. 2 "reprinted 1966 by J. Cramer ... Germany; New York, Stechert-Hafner Service Agency".Vol. I (1885): I. Report on the present state of knowledge of various insular floras, being an introduction to the botany of the Challenger expedition. By W. B. Hemsley.--II.--III. Report on the botany of the Bermudas and various other islands of the Atlantic and Southern oceans. By W. B. Hemsley. (bot. I-II)--IV. Report on the botany of Juan Fernandez, the south-eastern Moluccas, and the Admiralty islands. By W. B. Hemsley. (Bot.III).--Vol II. (1886): Report on the Diatomaceae collected by H. M. S. Challenger. By Conte Abate Francesco Castracane degli Antelminelli. (Bot. IV.).Mode of access: Internet
18.—Deep-sea Drilling with D/V <i>Glomar Challenger.</i>
No full textThe H.M.S. Challenger and D/V Glomar Challenger; it gives those of us who have had the pleasure and good fortune to be associated with the Glomar Challenger and the Deep Sea Drilling Project the greatest of pride to be identified in the name of what was undoubtedly the most progressive of all deep-sea explorations, the voyage of the H.M.S. Challenger one hundred years ago.As its sequel, we are deeply indebted to those who explored the deep ocean basins in the Challenger before, and whose courageous and inspired explorations were instrumental in making our Glomar Challenger possible.</jats:p
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Chart of the world on Mercator's projection [cartographic material] : showing the direction of the ocean currents, with the routes and distances between the principal ports.
No full textWorld map on Mercator's projection showing the route of Challenger Expedition in 1873-1874 and submarine telegraph lines.; In upper right margin: 3.; Probably issued as plate 3 in: Bradley's atlas of the world for commercial and library reference. Philadelphia : Wm. M. Bradley & Bros., 1884.; Prime meridian: Greenwich.; Tooley's dictionary of mapmakers vol. 1, p. 182.; Also available in an electronic version via the internet at: http://nla.gov.au/nla.map-rm3975
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