1,721,015 research outputs found
FIGURE 1. Monanthotaxis paniculata. A. Flowering branch. B. Flower bud. C. Flower bud with 3 petals removed. D. Petal from outside. E. Petal from inside. F. Stamen from inside. G. Stamen lateral view. H. Stamen from outside. I. Stamen from top. J. Staminode. K. Ovary. L. Leaf uppserside. A–K from McPherson 16123 in A new species of Monanthotaxis from Gabon with a unique inflorescence type for Annonaceae
No full textFIGURE 1. Monanthotaxis paniculata. A. Flowering branch. B. Flower bud. C. Flower bud with 3 petals removed. D. Petal from outside. E. Petal from inside. F. Stamen from inside. G. Stamen lateral view. H. Stamen from outside. I. Stamen from top. J. Staminode. K. Ovary. L. Leaf uppserside. A–K from McPherson 16123; L from Reitsma 2870. Illustrator: Esmée Winkel.Published as part of Hoekstra, Paul H., Chatrou, Lars W. & Wieringa, Jan J., 2014, A new species of Monanthotaxis from Gabon with a unique inflorescence type for Annonaceae, pp. 106-112 in Phytotaxa 186 (2) on page 107, DOI: 10.11646/phytotaxa.186.2.5, http://zenodo.org/record/514698
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Monanthotaxis paniculata P. H. Hoekstra 2014, spec. nov.
No full textMonanthotaxis paniculata P.H.Hoekstra, spec. nov. (Fig. 1) Type:— GABON. Ogooué-Ivindo: north of Koumameyong along SHM lumber roads, 0˚ 25’ N, 11˚ 55’ E, 31 January 1993, McPherson 16123 (holotype: WAG!, isotypes: MO!, P!). Additional specimen examined: GABON, Estuaire: ca 20 km N of Libreville, 29 January 1987, Reitsma 2870 (NY!, WAG!). Monanthotaxis paniculata resembles Monanthotaxis congoensis, but differs in the panicle-like inflorescence, instead of a raceme. Liana to 20 m long; old branches dark, blackish, glabrescent with lenticels, young branches densely pubescent with appressed, ferrugineous-brown hairs 0.5 mm long. Petioles 4–8 mm long, 1.0– 1.5 mm wide, grooved adaxially, densely pubescent around. Leaf lamina 8.5–23.5 × 3.3–6.6 cm, length: width ratio 2.0–4.2, ovate to oblong-lanceolate, base cuneate to almost rounded with small linear black swollen base (see notes), apex acute to acuminate, acumen to 2.7 cm long, chartaceous, discolorous, young leaves adaxially with scattered appressed white hairs 1 mm long, glabrescent, abaxially glaucous or green, densely pubescent with appressed yellowish hairs 2 mm long, less densely in older leaves, secondary veins 9–16 on each side of primary vein, oblique, curving upwards, impressed adaxially, tertiary venation scalariform to somewhat reticulate, finely raised adaxially, abaxially only visible in older leaves. Inflorescence axillary or terminal, a 5.5–27.0 cm long panicle-like rhipidium with many flowers, peduncle 15–40 mm, rachis often multiple times bi- or trifurcate, densely pubescent with short ferrugineous hairs, 1–3 flowers in the axil of each bract; bracts lanceolate 1.0–8.0 × 0.5–1.5 mm, same indumentum as rachis; flower buds depressed-globose. Flowers bisexual; pedicels 5–29 × 0.4–0.8 mm, indumentum as rachis; sepals 3, 0.6–1.3 ×1.0– 1.5 mm, broadly ovate, outside densely pubescent with ferrugineous hairs, inside glabrous, apex acute; petals 6 in one whorl, yellowish or dull yellow, 2.7–3.0 × 1.5–2.0 mm, ovate, both inside and outside with short, appressed yellowish hairs; receptacle 2.0– 3.5 mm in diameter; stamens 12, in one whorl, inserted on a black hexagonal disc, 6 fertile stamens opposite to the petals, free at the base, obconic, 0.6 mm long, filaments 0.2 mm long, theca introrse/latrorse, connective appendage glabrous, truncate, kidney-shaped from above, 1.0 mm wide, not hiding anther cells, 6 sterile stamens alternating with inner stamens, 0.4 mm long, 0.5 mm wide, reduced theca-like structures 2, dorsal; carpels 14–24, 0.9 × 0.4 mm, ellipsoid, densely ferrugineous pubescent with 1 ovule, stigma bifurcate, 0.2 mm long, glabrous. Fruits unknown. Etymology:— The specific epithet refers to the lax, many-flowered panicle-like inflorescence, which is unique within the family of Annonaceae. Distribution:— Gabon, provinces Estuaire and Ogooué-Ivindo (Fig. 2). Ecology:— In forest fringe of a marshy savannah and along lumber roads, elev. 0– 500 m. Phenology:— Flowers collected in the last week of January. IUCN-conservation status:— A first assessment results in “Data Deficient”, since the extent of occurrence cannot be calculated with only two data points. However, in the last decades many collections have been made in Gabon, and for the revision we have seen almost all collections of Monanthotaxis in Gabon and surrounding countries. No other material has thus far been found. Therefore, the species seems to be genuinely rare (see also the discussion). Furthermore, both collections have been made in unprotected areas, one of which is in danger because of the expanding city of Libreville. The other collection has been made in a logging area, and therefore we suggest the status endangered: B2 ab(iii) for this species. Notes:— A black swollen leaf margin at the base of the leaf is a common feature in many species of Monanthotaxis. In most literature, it is referred to as glands (e.g. Le Thomas 1969, Verdcourt 1971a). We are not sure if it is glandular tissue and until this is examined in more detail do not refer to it as such.Published as part of Hoekstra, Paul H., Chatrou, Lars W. & Wieringa, Jan J., 2014, A new species of Monanthotaxis from Gabon with a unique inflorescence type for Annonaceae, pp. 106-112 in Phytotaxa 186 (2) on pages 106-109, DOI: 10.11646/phytotaxa.186.2.5, http://zenodo.org/record/514698
Variations on the Author
Full text link“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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
