346 research outputs found
Image library: Physalis infinemundi Wilf
No full textFull-resolution image library of the fossil Solanaceae fruit Physalis
infinemundi Wilf, published:
Wilf P, MR
Carvalho, MA Gandolfo, NR Cúneo. 2017. Eocene lantern fruits from Gondwanan Patagonia
and the early origins of Solanaceae. Science, v. 355, p. 71-75, 6 January 2017. DOI:
10.1126/science.aag2737Specimen numbers are in the filenames: holotype MPEF-Pb 6434a,b and paratype MPEF-Pb 6435a,b. Use the provided 2x and 4x scale files as overlays for files whose filenames contain those magnifications. Image quality varies according to equipment used. There are several super-resolution composite images included.Please refer to the primary paper for all details and cite both the primary paper and this Figshare archive if you use these images. The fossils are curated at Museo Paleontológico Egidio Feruglio in Trelew, Chubut, Argentina as described in the primary paper. Special thanks to Michael Donovan and Ignacio Escapa for assistance with the photography. Contact: [email protected]</p
Image Library: Acmopyle grayae A. Andruchow-Colombo, G. Rossetto-Harris, Tim J. Brodribb, M.A. Gandolfo, P. Wilf and Dacrycarpus engelhardti Wilf et Andruchow-Colombo
No full textFull-resolution image library of the two fossil Podocarpaceae species from Argentina- Acmopyle grayae A. Andruchow-Colombo, G. Rossetto-Harris, Tim J. Brodribb, M.A. Gandolfo, P. Wilf and Dacrycarpus engelhardti Wilf et Andruchow-Colombo - that were published here:Andruchow-Colombo, A., Rossetto-Harris, G., Brodribb, T. J., Gandolfo, M. A., and Wilf, P.. 2023. A new fossil Acmopyle with accessory transfusion tissue and potential reproductive buds: Direct evidence for ever-wet rainforests in Eocene Patagonia. American Journal of Botany e16221. https://doi.org/10.1002/ajb2.16221All photos taken by Peter Wilf.Please consult the provided Excel lookup table for the specimen data for both species and formal repository numbers.Please cite all material by repository number (not field number), prefixes MPEF-Pb, MAP-BAR, or USNM.Photo time stamp format is usually (YYYYMMDD HHMMSS).Please refer to the primary paper for all details and cite both the primary paper and this Figshare archive if you use these images.</p
Molecular dates require geologic testing
No full textFil: Wilf, Peter. State University of Pennsylvania; Estados UnidosFil: Escapa, Ignacio Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; Argentin
Original 1200 dpi plates for Wilf 2012 Dacrycarpus puertae paper in American Journal of Botany.
No full text<p>Original resolution, 1200 dpi versions of the most important color plates published in:</p>
<p>Wilf, P. 2012. Rainforest conifers of Eocene Patagonia: attached cones and foliage of the extant southeast-Asian and Australasian genus <em>Dacrycarpus</em> (Podocarpaceae). American Journal of Botany, v. 99, p. 562-584.</p>
<p>http://www.amjbot.org/content/99/3/562.abstract</p>
<p>doi:10.3732/ajb.1100367</p
Original 1200 dpi plates for Wilf et al. 2014 Agathis zamunerae paper in American Journal of Botany.
No full text<p>Original resolution, 1200 dpi versions of figures published in:</p>
<p>Wilf P, IH Escapa, NR Cúneo, RM Kooyman, KR Johnson, A Iglesias. 2014. First South American <em>Agathis</em> (Araucariaceae), Eocene of Patagonia. American Journal of Botany, v. 101, p. 156-179.</p>
<p>doi:10.3732/ajb.1300327</p
Aunt Martha's Barn
No full textComposed by Wilf Doyle. Recorded it on one of his albums. A take-off from "Aunt Martha's Sheep
Green Web or megabiased clock? Plant fossils from Gondwanan Patagonia speak on evolutionary radiations
No full textEvolutionary divergence-age estimates derived from molecular ‘clocks’ are frequently correlated with paleogeographic, paleoclimatic and extinction events. One prominent hypothesis based on molecular data states that the dominant pattern of Southern Hemisphere biogeography is post-Gondwanan clade origins and subsequent dispersal across the oceans in a metaphoric ‘Green Web’. We tested this idea against well-dated Patagonian fossils of 19 plant lineages, representing organisms that actually lived on Gondwana. Most of these occurrences are substantially older than their respective, often post-Gondwanan molecular dates. The Green Web interpretation probably results from directional bias in molecular results. Gondwanan history remains fundamental to understanding Southern Hemisphere plant radiations, and we urge significantly greater caution when using molecular dating to interpret the biological impacts of geological events.Fil: Wilf, Peter. State University Of Pennsylvania; Estados UnidosFil: Escapa, Ignacio Hernan. Museo Paleontológico Egidio Feruglio; Argentina. State University Of Pennsylvania; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentin
2004 Paleobiology Wilf & Johnson dataset
No full textThis is the original database file that supplemented the following primary article:Wilf, P., and K.R. Johnson, 2004, Land plant extinction at the end of the Cretaceous: a quantitative analysis of the North Dakota megafloral record. Paleobiology, v. 30, p. 347–368. doi:10.1666/0094-8373(2004)0302.0.CO;2The original annotation on p. 351-352 of the primary article read as follows:"The complete data set used in this article is available as a single electronic file for unrestricted download from the Paleobiology Database, www.paleodb.org (under ‘‘major data sets deposited’’) or by request from either author. Detailed locality data, most of which are provided by Johnson (2002), are also archived without access restriction in the Paleobiology Database (search under the locality names in the electronic file or under ‘‘Authorizer = Johnson’’)."We often receive email requests for this file, which seems no longer to be available at the Paleobiology Database (now at https://paleobiodb.org) and is thus archived here to preserve it. However, the locality data and floral lists remain available at PaleobioDb as entered.The file is a standard Excel workbook in two tabs: 1. species by locality matrix. 2. species by 1m stratigraphic-bin matrix, using minimum abundances. See the file and the primary article for all details.</p
Power series expansion of Wilf function
No full textIn the research, with aid of the Faà di Bruno formula, be virtue of several identities for the Bell polynomials of the second kind, with help of two combinatorial identities, by means of the (logarithmically) complete monotonicity of generating functions of several integer sequences, and in light of the Wronski theorem, the author \begin{enumerate} \item establishes the Taylor power series expansions of several functions involving the inverse (hyperbolic) tangent function; \item finds out the Maclaurin power series expansion of the Wilf function, which is a composite of the inverse tangent, square root, and exponential functions; \item expresses the coefficients in the Maclaurin power series expansion of the Wilf function in terms of the Stirling numbers of the second kind; \item analyzes some properties, including generating functions, limits, positivity, monotonicity, and logarithmic convexity, of the coefficients in the Maclaurin power series expansion of the Wilf function; \item derives a closed-form formula for a sequence of special values of the Gauss hypergeometric function; \item discovers a closed-form formula for a sequence of special values of the Bell polynomials of the second kind; \item presents several infinite series representations of the circular constant and other sequences; \item recovers an asymptotic rational approximation to the circular constant; \item and connects several integer sequences by determinants. \end{enumerate}34 page
My name is Peter Emberley as ye may understand
No full textHaving been fatally injured in the woods, Peter sends messages to his parents and to his sweetheart.Laws C27; Greenleaf 1968:334
- …
