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FIGURE 97–111 in Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species
No full textFIGURE 97–111. Navicula veneta, strain LCR-S:2:2:1, CHR618416. Scales: Fig 97, 10 µm; Fig. 98, 5 µm (use for Figs 98–104); Fig. 109, 1 µm (use for Figs 106–109), all others 1 µm. Fig. 97. Live cells viewed by LM, showing paired parietal plastids close against valve margins. Fig. 98–104. Cleaned frustules viewed by LM (girdle view in Fig. 104). Figs 105–111. SEM of cleaned frustules. Fig. 105, whole frustule, showing elongated, longitudinally aligned areolae; Figs 106–109, widened central area of four valves, showing hooked central raphe termini; Figs 110, 111, valve apices showing hooked raphe termini and pattern of areolae.Published as part of Novis, Phil M., Braidwood, Jasmine & Kilroy, Cathy, 2012, Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species, pp. 11-45 in Phytotaxa 64 (1) on page 32, DOI: 10.11646/phytotaxa.64.1.3, http://zenodo.org/record/506200
Nitzschia draveillensis Coste & Ricard 1980
No full textNitzschia draveillensis Coste & Ricard 1980 (Figs 42–51, 162) Frustules fusiform with extended rostrate poles, 47.0–63.0 µm long, 3.4–4.5 µm wide in valve view; sometimes slightly constricted at midpoint at one or both margins. Living cells containing 2 plate-like parietal chloroplasts, one towards each pole (Fig. 42). Striae very fine, transverse, 69–72 in 10 µm, not visible in LM. Raphe system marginal, fibulate, 21–23 fibulae in 10 µm, but with two median fibulae more widely spaced; raphe on opposite margins of the two valves. Central raphe endings occurring between median fibulae (Fig. 51, visualised in TEM; not discerned either in LM or SEM). References: — Coste & Ricard (1980) p. 190, figs 70, 73, 74; Krammer & Lange-Bertalot (1988) p. 123–124, fig. 85: 5–6. Specimens examined: —CHR618409! (cleaned frustules from cultured strain LCR-S:37:3). Distribution: —There are two unpublished records of this species from New Zealand, from Lake Moeraki, 17 December 2002 (2 frustules seen) and Lake Wahapo, 16 December 2002 (1 frustule seen). The species is not commonly reported world-wide. It appeared in culture from the Styx at site 6. Molecular data: —There were no close matches to the 18S sequence of this strain; the closest was N. pusilla Grunow 1862 clone NIPU1, isolated from the Rollingerbaach River, Luxembourg (p-distance = 0.020). The Styx strain was placed alone on a long branch in the Bayesian analysis, without any robustly resolved relationships (Fig. 162). The MPB analysis placed it sister to N. acicularis (Kütz.) Smith 1853, but with low bootstrap support (56%). The length of the Styx fragment was 1168 bp in an overall dataset 1707 bp long, containing 91 variable sites (39 parsimony informative, 27 occurring within the Styx fragment). Observations: — Coste & Ricard (1980) did not specifically describe the position of the raphe canal on the two valves of N. draveillensis, although they stated that the differences between this and N. acicularis were the occurrence of median fibulae, very delicate striae with quadrangular areolae, and very long extremities in N. draveillensis. We take this to imply that the raphe canals are on opposite sides of the valves in both species, which agrees with our observations here. We observed both rectangular and quadrangular areolae on the same valve in our specimens, but the striae and fibulae densities are close to Coste & Ricard's observations (55–64 and 19–21 in 10 µm respectively). Our specimens were not as long as theirs (up to 110 µm). We note that this species and N. acicularis are very easily confused, the most important difference being the presence of the more widely spaced median fibulae and central raphe endings in N. draveillensis. Given the ease with which these features can be overlooked, we wonder how reliably the distribution of these two species can be known, and whether N. acicularis actually occurs in New Zealand. Molecular data suggest that the two species are not very close relatives.Published as part of Novis, Phil M., Braidwood, Jasmine & Kilroy, Cathy, 2012, Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species, pp. 11-45 in Phytotaxa 64 (1) on page 23, DOI: 10.11646/phytotaxa.64.1.3, http://zenodo.org/record/506200
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
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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
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