25,776 research outputs found
Chapter 21 - The ecology of tropical wood. Supplement 2 - Images of 353 wood cores collected from 353 species at sites near Barro Colorado Island, Panama.
No full textScanned images of 353 wood cores. Supplement 1 (https://doi.org/10.25573/data.22806797) provides metadata including the Latin binomial or species name associated with the file name of each image. Joe Wright and colleagues collected the wood cores with 5-mm diameter increment borers at sites within approximately 10 km of Barro Colorado Island in central Panama. Each core was broken into segments approximately 5 cm long. Peter Hietz and colleagues sanded and polished the outermost segment perpendicular to the grain to produce cross sections or transverse planes. Larger xylem vessels are visible (smaller vessels might be filled with dust). Growth ring borders, and rays are also visible in many images. The source reference follows: Hietz, P. 2024. The Ecology of Tropical Wood. In The First 100 Years of Research on Barro Colorado: Plant and Ecosystem Science, ed. H. C. Muller-Landau and S. J. Wright: Smithsonian Institution Scholarly Press, Washington, DC.</p
Root and branch hydraulic functioning and trait coordination across organs in drought-deciduous and evergreen tree species of a subtropical highland forest
No full text<p xmlns:mml="http://www.w3.org/1998/Math/MathML">Vessel traits are key in understanding trees’ hydraulic efficiency, and related characteristics like growth performance and drought tolerance. While most plant hydraulic studies have focused on aboveground organs, our understanding of root hydraulic functioning and trait coordination across organs remains limited. Furthermore, studies from seasonally dry (sub-)tropical ecosystems and mountain forests are virtually lacking and uncertainties remain regarding potentially different hydraulic strategies of plants differing in leaf habit. Here, we compared wood anatomical traits and specific hydraulic conductivities between coarse roots and small branches of five drought-deciduous and eight evergreen angiosperm tree species in a seasonally dry subtropical Afromontane forest in Ethiopia. We hypothesized that largest vessels and highest hydraulic conductivities are found in roots, with greater vessel tapering between roots and equally-sized branches in evergreen angiosperms due to their drought-tolerating strategy. We further hypothesized that the hydraulic efficiencies of root and branches cannot be predicted from wood density, but that wood densities across organs are generally related. Root-to-branch ratios of conduit diameters varied between 0.8 and 2.8, indicating considerable differences in tapering from coarse roots to small branches. While deciduous trees showed larger branch xylem vessels compared to evergreen angiosperms, root-to-branch ratios were highly variable within both leaf habit types, and evergreen species did not show a more pronounced degree of tapering. Empirically determined hydraulic conductivity and corresponding root-to-branch ratios were similar between both leaf habit types. Wood density of angiosperm roots was negatively related to hydraulic efficiency and vessel dimensions; weaker relationships were found in branches. Wood density of small branches was neither related to stem nor coarse root wood densities. We conclude that in seasonally dry subtropical forests, similar-sized coarse roots hold larger xylem vessels than small branches, but the degree of tapering from roots to branches is highly variable. Our results indicate that leaf habit does not necessarily influence the relationship between coarse root and branch hydraulic traits. However, larger conduits in branches and a low carbon investment in less dense wood may be a prerequisite for high growth rates of drought-deciduous trees during their shortened growing season. The correlation of stem and root wood densities with root hydraulic traits but not branch wood points toward large trade-offs in branch xylem towards mechanical properties.</p>
Chapter 21 - The ecology of tropical wood. Supplement 1 - Metadata for scanned images of 353 wood cores collected near Barro Colorado Island, Panama
No full textMetadata for the scanned images of 353 wood cores found in Supplement 2 (https://doi.org/10.25573/data.22806653). The metadata includes the species name (Latin binomial) for the 353 file names corresponding to the 353 scanned images and is saved as a comma delimited file. Joe Wright and colleagues collected the wood cores with 5-mm diameter increment borers at sites within approximately 10 km of Barro Colorado Island in central Panama. Each core was broken into segments approximately 5 cm long. Peter Hietz and colleagues selected the outermost segment closest to the bark and sanded and polished perpendicular to the grain to produce cross sections or transverse planes. Larger xylem vessels are visible (smaller vessels might be filled with dust). Growth ring borders, and rays are also visible in many images. The source reference follows: Hietz, P. 2024. The Ecology of Tropical Wood. In The First 100 Years of Research on Barro Colorado: Plant and Ecosystem Science, ed. H. C. Muller-Landau and S. J. Wright: Smithsonian Institution Scholarly Press, Washington, DC.</p
Author Peter FitzSimons speaking at the National Library of Australia, Canberra, 13 November 2012 /
No full textTitle from acquisitions documentation.; Part of the collection: Portraits of author Peter FitzSimons speaking at the National Library of Australia, Canberra, 13 November 2012.; Acquired in digital format; access copy available online.; Mode of access: Online.; Photographed by a staff member of the National Library of Australia
Moral Good, the Beatific Vision, and God’s Kingdom Writings by Germain Grisez and Peter Ryan, S.J.. Edited by Peter J. Weigel
No full textFor close to half a century, the work of Germain Grisez has been highly influential, and his writings continue to receive considerable attention from philosophers and theologians of diverse viewpoints. His co-author for this work is the professor and noted moral theologian Fr. Peter Ryan, S.J., currently the executive director of the Secretariat of Doctrine and Canonical Affairs of the United States Conference of Catholic Bishops (USCCB). These two eminent scholars explore fundamental questions about Christian eschatology, moral theory, the purpose of human life, and the promise of human fulfilment. The authors examine Christian teaching on the final destiny of persons, investigating the meaning of God's kingdom, the hope of the beatific vision, and the centrality of moral goodness and divine grace in one's final end. This work is an ideal source for students, scholars, ministers and lay persons interested in basic questions of Christian theology, the philosophy of religion, ethical theory, and Catholic doctrin
Murder on the mountain: author talk with Peter J. Wosh
No full textAuthor talk by Peter J. Wosh on May 5th, 2022, on his book, "Murder on the Mountain: crime, passion, and punishment in gilded age New Jersey.
Lunchtime Talk with Author and Attorney Peter Godwin
No full textAuthor and attorney Peter Godwin gave a lunchtime talk about the topics discussed in his book, The Fear, which focuses on the human rights situation in Zimbabwe under the rule of Robert Mugabe
An essay about the Francis Paudras Collection on Bud Powell by Peter Pullman
No full textThis is an essay about the Francis Paudras Collection on Bud Powell written by Peter Pullman, a jazz scholar and author of Wail: The Life of Bud Powell (Brooklyn: Bop Changes, 2012).One image file (pdf)This project was supported by a Recordings at Risk grant from the Council on Library and Information Resources (CLIR). The grant program is made possible by funding from The Andrew W. Mellon Foundation
Professor Peter Singer speaking at the National Press Club Canberra, 11 February 2009 [picture] /
No full textTitle devised by cataloguer based on information from acquisitions documentation.; Part of the collection: Humanitarian author Professor Peter Singer at the National Press Club, Canberra, 11 February 2009.; Acquired in digital format; access copy available online.; Mode of access: Internet via World Wide Web.; Photographed by a staff member of the National Library of Australia, 2009
The Peter Martyr reader
No full textAccession Number: ATLA0001328116; Language(s): English; Issued by ATLA: 20080715; Publication Type: Review; Related Books/Electronic Resources: By: Vermigli, Pietro Martire, 1499-1562 Peter Martyr reader viii, 260 p. Publisher: Kirksville, Mo.: Truman State University Press, 1999. ATLA0001327874Source type: Electronic(1)http://search.ebscohost.com/login.aspx?direct=true&db=reh&AN=ATLA0001328116&loginpage=Login.asp&site=ehost-liv
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