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Figure 2 in The largest amber-preserved flower revisited
No full textFigure 2. Details of Symplocos kowalewskii comb. nov. et emend. (Symplocaceae; X4088) from late Eocene Baltic amber. (a) Anther. (b) Basally fused and broadened filaments, arranged in three rows and forming a fused ring. (c) Underside of the fused staminate ring with trichomes (arrowhead). (d) Simple, long, acute trichome (right arrowhead), magnified from (c); lef arrowhead indicates fungal hyphae. Scale bars 200 µm in (a), (b), (d); 1 mm in (c).Published as part of Sadowski, Eva-Maria & Hofmann, Christa-Charlotte, 2023, Scientific Reports 13 (1) on page 17, DOI: 10.1038/s41598-022-24549-z, http://zenodo.org/record/753548
Figure 3 in The largest amber-preserved flower revisited
No full textFigure 3. Pollen extracted from anthers and the surrounding amber of Symplocos kowalewskii comb. nov. et emend. (Symplocaceae; X4088) from late Eocene Baltic amber. (a) Anther, releasing pollen. (b‒g) Pollen under LM; note the protrusions from the apertures (c), which were likely caused by the excreted internal cell content. (h) Pollen under electron microprobe, with exposed intine (arrowhead). (i,j) Pollen under electron microprobe, showing perforate to microreticulate ornamentation with few supratectal blunt echini. Note the fused verrucae at the margo of the ectoaperture, forming a rim-like structure (j). Scale bars 500 µm in (a); 50 µm in (b); 20 µm in (c–g); 10 µm in (h), 1 µm in (i,j).Published as part of Sadowski, Eva-Maria & Hofmann, Christa-Charlotte, 2023, Scientific Reports 13 (1) on page 17, DOI: 10.1038/s41598-022-24549-z, http://zenodo.org/record/753548
Text-fig. 1. Extant Sciadopitys verticillata pollen. a–c: LM images (scale bars 10 µm), a – polar view, b – equatorial view, c – equatorial view with well visible thinning of proximal leptoma; d–e: SEM overview images (scale bar 10 µm), d – distal polar view, e – oblique equatorial view; f – equatorial view with leptoma at top; g–i: SEM detailed images (scale bars 2 µm), g – detail of verrucate, echinate, perforate sexine of distal pol, h – wall break displaying thin nexine and verrucate, echinate sexine, i – ripped open leptoma displaying transition from verrucate sculpturing to nearly psilate state. in The Occurrence Of Pollen Of Sciadopityaceae Luerss. Through Time
No full textText-fig. 1. Extant Sciadopitys verticillata pollen. a–c: LM images (scale bars 10 µm), a – polar view, b – equatorial view, c – equatorial view with well visible thinning of proximal leptoma; d–e: SEM overview images (scale bar 10 µm), d – distal polar view, e – oblique equatorial view; f – equatorial view with leptoma at top; g–i: SEM detailed images (scale bars 2 µm), g – detail of verrucate, echinate, perforate sexine of distal pol, h – wall break displaying thin nexine and verrucate, echinate sexine, i – ripped open leptoma displaying transition from verrucate sculpturing to nearly psilate state.Published as part of Hofmann, Christa-Ch., Odgerel, Nyamsambuu & Seyfullah, Leyla J., 2021, The Occurrence Of Pollen Of Sciadopityaceae Luerss. Through Time, pp. 271-281 in Fossil Imprint 77 (2) on page 273, DOI: 10.37520/fi.2021.019, http://zenodo.org/record/716762
Text-fig. 2. Aptian to Albian Cerebropollenites taxa, all scale bars in LM and SEM overview images 10 µm, scale bars in SEM detailed images 2 µm. a–c: Cerebropollenites thiergartii from St. Pölten (Austria), a – LM image, equatorial view, b – SEM equatorial overview with visible, less sculptured leptoma, c – detail of echinate verrucae; d–f: Cerebropollenites thiergartii from Khovil basin (Mongolia), d – LM image polar view with well visible thin-walled leptoma, e – SEM of proximal polar view with faintly sculptures leptoma, f – SEM detailed view of transition from leptoma to normal sexine sculpturing; g–i: Cerebropollenites macroverrucosus from Khovil basin (Mongolia), g – LM image of oblique equatorial view, h – SEM of oblique equatorial view with concave leptoma, i – SEM detail of the rugulate to verrucate sexine and smaller sculpturing in leptoma area. in The Occurrence Of Pollen Of Sciadopityaceae Luerss. Through Time
No full textText-fig. 2. Aptian to Albian Cerebropollenites taxa, all scale bars in LM and SEM overview images 10 µm, scale bars in SEM detailed images 2 µm. a–c: Cerebropollenites thiergartii from St. Pölten (Austria), a – LM image, equatorial view, b – SEM equatorial overview with visible, less sculptured leptoma, c – detail of echinate verrucae; d–f: Cerebropollenites thiergartii from Khovil basin (Mongolia), d – LM image polar view with well visible thin-walled leptoma, e – SEM of proximal polar view with faintly sculptures leptoma, f – SEM detailed view of transition from leptoma to normal sexine sculpturing; g–i: Cerebropollenites macroverrucosus from Khovil basin (Mongolia), g – LM image of oblique equatorial view, h – SEM of oblique equatorial view with concave leptoma, i – SEM detail of the rugulate to verrucate sexine and smaller sculpturing in leptoma area.Published as part of Hofmann, Christa-Ch., Odgerel, Nyamsambuu & Seyfullah, Leyla J., 2021, The Occurrence Of Pollen Of Sciadopityaceae Luerss. Through Time, pp. 271-281 in Fossil Imprint 77 (2) on page 274, DOI: 10.37520/fi.2021.019, http://zenodo.org/record/716762
The Dagulf Psalter (Austrian National Library Cod. 1861): A Multi-Analytical Approach to Study Inks, Dyes, and Pigments of this Early Carolingian Manuscript
No full textThe Dagulf Psalter is a precious Carolingian manuscript on calf parch-
ment, dated to 793–795. Its unique and high historical value required a non-invasive,
multi-analytical approach to gain insights into the material composition of gold and
silver inks, pigments, and dyes used for writing and illuminations. Elemental map-
ping based on X-ray fluorescence analysis (XRF), Fibre Optics Reflectance Spectros-
copy (FORS) measurements, and hyperspectral imaging (HSI) gave complementary
information on colour media and their brilliant shades. Knowledge of the material
composition of inks, dyes, and pigments is of crucial importance not only for art
historical research, but also for the preservation of the manuscript, as it is known that among other factors, silver inks and some pigments can lead to deterioration of
parchment supports. The purple dye orchil and blue indigo were used for painted
backgrounds on the initial folios. Lapis lazuli was found in decorative frames on these
folios. Orchil, indigo, and lapis lazuli also appear in decorations of small initials
throughout the manuscript. Red lead, ochre, cinnabar, orpiment, and lead white were
also found in various painted details. Gold and silver inks of high purity were identified.
The proof of chlorine in the silver ink indicates the presence of corrosion products
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
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