130,399 research outputs found
FIGURE 5. Lepanthes bogariniana. A, habit. B, flower. C, dissected flower. D in A correction to the Lepanthes guatemalensis group (Orchidaceae: Pleurothallidinae) in Costa Rica, with a new species
No full textFIGURE 5. Lepanthes bogariniana. A, habit. B, flower. C, dissected flower. D, lip, adaxial view. E, ovary, column and lip, lateral view. F, pollinarium and anther cap. All drawn by D. Bogarín from Bogarín 573 (JBL-spirit).Published as part of Pupulin, Franco, 2021, A correction to the Lepanthes guatemalensis group (Orchidaceae: Pleurothallidinae) in Costa Rica, with a new species, pp. 69-78 in Phytotaxa 480 (1) on page 76, DOI: 10.11646/phytotaxa.480.1.6, http://zenodo.org/record/541473
Introduzione di un doppio vincolo conformazionale in un peptide del PND che aumenta l'infettività del virus HIV-1 per lo studio delle relazioni struttura-funzione
No full textFlora costaricensis. Family #39 Orchidaceae: Tribe Cymbidieae: Subtribe Zygopetalinae
No full textAlthough they only represent a small portion (around four percent) of the Costa Rican orchid flora, species of Zygopetalinae are frequently grown (and often avidly collected) for horticultural purposes, and their study is crucial to understanding distribution patterns and species frequency as the first step to establish conservation priorities. Among the genera of Zygopetalinae, Dichaea constitutes a particularly common element in any type of vegetation in the country, and its taxonomic treatment should have a certain utility to field botanists working in Costa Rica. Sixteen genera (including a natural hybrid genus) and 60 species are treated. The work was based on direct examination of the available specimens deposited at AMES, CR, INB, K, M, SEL, USJ, and W; the spirit collection of Lankester Botanical Garden (JBL-Spirit); and
scrutiny of digital images fromthe collections kept at F, NY, MO, and US. To ensure nomenclature stability, many of the Costa Rican taxa in the group were recently typified, and additional lectotypes are selected here for Cryptarrhena guatemalensis Schltr. (AMES), Kefersteinia subquadrata Schltr. (AMES), and Warczewiczella caloglossa Schltr. (AMES). Many of the descriptions of individual species are based on
those appearing in recent generic revisions by the author; they include the observed variations among specimens native from Costa Rica. All the treated taxa are illustrated with one or more ink illustrations. With the exceptions of D. acostae Schltr., D. gracillima C.Schweinf., and D. gomez-lauritoi Pupulin, which are known only from the dried material of the type collections, the illustrations of all the remaining taxa were prepared by the author on the basis of living specimens with the aid of a stereomicroscope fitted with a drawing tube. As in the previous volume of this series on Costa Rican Orchidaceae, the illustrations are arranged according to their occurrence in the keys to facilitate the comparison of closely allied taxa.Universidad de Costa Rica/[814-A4-068]/UCR/Costa RicaUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Jardín Botánico Lankester (JBL
Comparison of flowers of species of the <i>Specklinia endotrachys</i> group.
No full text<p>A. <i>Specklinia dunstervillei</i> (<i>Karremans 5966</i>). B. <i>Specklinia dunstervillei</i> (<i>Karremans 5899</i>). C. <i>Specklinia endotrachys</i> (<i>Blanco 961</i>). D. <i>Specklinia pfavii</i> (<i>JBL-11086</i>). E. <i>Specklinia remotiflora</i> (<i>Bogarín 8181</i>). E. <i>Specklinia spectabilis</i> (<i>JBL-02641</i>). All flowers shown in front, three-quarters side, and side views. Photographs by F. Pupulin (B-F) and R. van Vugt (A).</p
<i>Specklinia dunstervillei</i> Karremans, Pupulin & Gravendeel
No full text<p>. A) Habit; B) Flower; C) Dissected perianth; D) Lateral view of the lip placement relative to lateral sepals; E) Column and lip, lateral view; F) Column, ventral view; G) Lip, extended; H) Petals; I) Anther cap with pollinia; J) Pollinia. Drawn from the holotype (<i>Karremans 5966</i>) by Esmée Winkel.</p
FIGURE 6 in A reconsideration of the empusellous species of Specklinia (Orchidaceae: Pleurothallidinae) in Costa Rica
No full textFIGURE 6. Specklinia pfavii (Rchb.f.) Pupulin & Karremans. A. Habit. B. Flower. C. Dissected perianth. D. Petals. E. Column and lip, side view. F. Lip, front and side views. G. Column, ventral view. H. Anther. I. Pollinia. Drawn by E. Winkel from Karremans 4825 (L-spirit).Published as part of Pupulin, Franco, Karremans, Adam P. & Gravendeel, Barbara, 2012, A reconsideration of the empusellous species of Specklinia (Orchidaceae: Pleurothallidinae) in Costa Rica, pp. 1-20 in Phytotaxa 63 (1) on page 10, DOI: 10.11646/phytotaxa.63.1.1, http://zenodo.org/record/506190
MeSH term explosion and author rank improve expert recommendations
Get PDFInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
Get PDFBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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