104,641 research outputs found
Crocus biflorus subsp. caelestis KERNDORFF & PASCHE 2006, subsp. nova
No full textCrocus biflorus subsp. caelestis KERNDORFF & PASCHE, subsp. nova H o l o t y p u s: Turkey,Phrygia, Uşak Province, surrounding areas of the city of Uşak, 1200- 1400 m, 13.3.2004, HKEP 0409 (LI). Subspecies punctato affinis, sed cum colore florum pallidiore, caelestis, sine segmentis peculiaris punctatis vel segmentis triis exterioris extus significante colorata, antherea sine lobis nigris, filamenta incolorata et folia plura. Corm globose, about 10-15 mm in diameter. Tunics more or less membranous, splitting longitudinally into stripes, with rings at base. Neck short, approximately 3-5 mm. Cataphylls 3, silvery-white, the outer ones drying very light brownish. Leaves shorter than flowers at anthesis, 3-7 but normally 4, green, 0.5-1 mm in diameter, glabrous, no ribs underneath. White stripe normally distinctly smaller than 1/3 of leaf diameter. Throat mostly white or light lemon-yellow to yellow, glabrous. Perianth tube greyish-blue. Outer segments between 19 and 29 mm but usually 23 mm long, between 6 and 12 mm mostly 7 mm wide. Inner segments between 18 and 27 mm but usually 23 mm long and between 5 and 13 mm frequently 7 mm wide. Inside all segments are pale sky-blue without markings, outside also pale sky-blue rarely with very diffuse markings or stripes. Prophyll absent. Bract and bracteole present, silvery-white, conspicuous. Filaments on average 3.7 mm long, colourless to light yellow, glabrous to scabrid at base; anthers on average 9.2 mm long, yellow, connective colourless. Pollen yellow. The styles are orange to red, divided into 3 branches which are not trumpet-shaped and only slightly fringed towards the apex; branches 3-7 mm but usually 5 mm long, glabrous to scabrid. The styles are mostly shorter to equal compared to the stamens. Capsule and seeds not seen. Chromosome number unknown. C. biflorus subsp. caelestis clearly differs from other C. biflorus taxa of south-west Anatolia in colour and overall appearance. It is generally rather pale "heavenly blue" (= caelestis). In most specimens featherings and markings are very diffuse, poorly developed or missing at all. The sky-blue colouring of the segments is most intensive at the apex but decreasing rapidly into a whitish or light yellow colour (rarely deeper yellow) towards the centre of the flower, giving the plant a somewhat "out-washed" appearance. Although morphologically close to subspp. punctatus and pulchricolor (on the basis of the cluster analysis) it can be distinguished from both considering several additional parameters which are not included in cluster analysis. In case of C. biflorus subsp. punctatus it is e.g. the lack of both speckling on the outside of the outer segments and the black tips at the lower ends of the anthers. It is also different in having colourless filaments compared to the deep yellow ones of subsp. punctatus, and it has on average one more leaf. C. biflorus subsp. pulchricolor is much more colourful than C. biflorus subsp. caelestis, mostly rich blue-violet, darker towards the base of the segments, having a deep yellow throat, and distinct brown cataphylls, bracts, and bracteols. D i s t r i b u t i o n a n d h a b i t a t: Turkey,Phrygia, Uşak Province. As yet only known from the type locality in the vicinity of the city of Uşak in open areas, light forests, scrub, together with Pinus nigra subsp. pallasiana, Juniperus, Cistus laurifolius, Verbascum, Crocus chrysanthus, Ornithogalum, Colchicum and others. Crocus biflorus subsp. caelestis seems to prefer calcareous soils. No hybrids between C. chrysanthus and C. biflorus subsp. caelestis could be observed.Published as part of Kerndorff, H. & Pasche, E., 2006, Crocus biflorus (Liliiflorae, Iridaceae) in Anatolia (Part Three), pp. 165-187 in Linzer biologische Beiträge 38 (1) on pages 179-180, DOI: 10.5281/zenodo.543276
Crocus biflorus subsp. yataganensis KERNDORFF & PASCHE 2006, subsp. nova
No full textCrocus biflorus subsp. yataganensis KERNDORFF & PASCHE, subsp. nova H o l o t y p u s Turkey, Caria, Province Muğla, Doğu Menteşe Dağları, 1000-1200 m, 18.3.2004, HKEP 0402 (LI). Impressio generaliter cum subsp. pulchricolori et subsp. ionopharynx affinis, sed distinctum ab subsp. pulchricolori per folia minores, structura atque ovi putamen, segmentas angustioras, antheras brevioras, 1(2) costas foliis inferioris, stylos qui plerumque sunt longiores vel longas aequalis, et per ramos styli qui sunt distincte longiores, scabrous et papillosos. Distinctum ab subsp. ionopharynx per filamentas brevioras, sine exceptione antherae lutae, antherarum connectivum incoloratum et rami stylorum longiores. Corm globose, about 10-15 mm in diameter. Tunics coriaceous, splitting longitudinally into numerous stripes, with rings at base. Neck short, approximately 3 mm. Cataphylls 3, silvery-white, drying light brownish. Leaves shorter than flowers at anthesis, 2-5 but normally 3, green, (1)- 1.5 mm in diameter, glabrous, (1) 2 ribs underneath. White stripe normal, width approximately 1/3 of leaf diameter. Throat yellow, glabrous, perianth tube whitish. Outer segments between 20 and 30 mm but usually 25 mm long, between 6 and 11 mm mostly 8 mm wide. Inner segments between 15 and 29 mm but usually 22 mm long and between 6 and 10 mm frequently 8 mm wide. Inside all segments are blue-violet without markings, outside also blue-violet rarely with diffuse featherings or specklings but with a distinct dark violet blotch towards the perianth tube. Colouring and marking similar to outer segments but violet blotch much smaller or not existent. Prophyll absent. Bract and bracteole present, silvery-white, conspicuous. Filaments on average 3.5 mm long, deep yellow, glabrous or scabrid; anthers on average 8.1 mm long, yellow, connective colourless. Pollen yellow. The styles are deep red, divided into 3 branches which are trumpet-shaped and fringed towards the end; branches 5-11 mm but usually 8 mm long, scabrid to densely papillose. The styles are mostly longer to equal as the stamens. Capsule and seeds not seen. Chromosome number unknown. In its overall appearance the new subsp. yataganensis is somewhat similar to subspp. pulchricolor and ionopharynx. The differences to subsp. pulchricolor are: coriaceous corm tunic (membranous in subsp. pulchricolor) more narrow segments, shorter anthers, smaller number of leaves with 1 or mostly 2 ribs underneath (subsp. pulchricolor usually has none); the styles are usually longer to equal (94%) compared to the stamens. In subsp. pulchricolor the styles are mostly equal to or shorter than the stamens (79%). The style-branches are scabrid to densely papillose whereas those of subsp. pulchricolor are glabrous or slightly scabrid. Finally, the style branches of subsp. yataganensis are relatively long, on average 7,7 mm compared to 4,6 mm of subsp. pulchricolor. The differences to subsp. ionopharynx are: shorter filaments (3,5 mm compared to 7,4 mm in subsp. ionopharynx); always yellow anthers and colourless connectives instead of blackish or dark greyish anthers with blackish connectives towards the apex. The stylebranches of subsp. yataganensis are 7.7 mm long (mean) compared to 5 mm in subsp. ionopharynx. As can be seen from the dendrogram, subsp. yataganensis has a rather isolated morphological position. It is a typical representative of a phenomenon widely observed within the genus. The number and nature of morphological parameters are more or less constant in the genus but often different taxa are only described by their different combinations of characters which is obviously the case for subsp. yataganensis. We believe that, in combination with isolated occurrences and/or large geographical distances between allies, a taxonomical recognition seems to be justified in such cases. D i s t r i b u t i o n a n d h a b i t a t Turkey, Caria, Muğla Province, very local, in open forests, along mountain slopes, together with Pinus nigra subsp. pallasiana, Cistus laurifolius, Gagea, Draba, grasses and others. Crocus biflorus subsp. yataganensis grows on calcareous formations. Known only from the type locality in the Doğu Menteşe Dağları in mountainous areas not far from the City of Yatağan (hence the name yataganensis). Specimens of this new subspecies are very colourful as can be seen from the colour-plate and photographs. When looking into an open flower the comparatively long and deep red style-branches are most remarkable. Apart from those of C. biflorus subsp. wattiorum they are the longest ones (up to 11 mm) found in the "species" considering the populations investigated in south-west Anatolia.Published as part of Kerndorff, H. & Pasche, E., 2006, Crocus biflorus (Liliiflorae, Iridaceae) in Anatolia (Part Three), pp. 165-187 in Linzer biologische Beiträge 38 (1) on pages 178-179, DOI: 10.5281/zenodo.543276
Crocus biflorus (Liliiflorae, Iridaceae) in Anatolia (Part Three)
No full textKerndorff, H., Pasche, E. (2006): Crocus biflorus (Liliiflorae, Iridaceae) in Anatolia (Part Three). Linzer biologische Beiträge 38 (1): 165-187, DOI: http://doi.org/10.5281/zenodo.543276
Fig. 1 in Crocus biflorus (Liliiflorae, Iridaceae) in Anatolia (Part Three)
No full textFig. 1: Cluster analysis.Published as part of Kerndorff, H. & Pasche, E., 2006, Crocus biflorus (Liliiflorae, Iridaceae) in Anatolia (Part Three), pp. 165-187 in Linzer biologische Beiträge 38 (1) on page 166, DOI: 10.5281/zenodo.543276
Map 2 in Crocus biflorus (Liliiflorae, Iridaceae) in Anatolia (Part Three)
No full textMap 2: Distribution of taxon groups.Published as part of Kerndorff, H. & Pasche, E., 2006, Crocus biflorus (Liliiflorae, Iridaceae) in Anatolia (Part Three), pp. 165-187 in Linzer biologische Beiträge 38 (1) on page 175, DOI: 10.5281/zenodo.543276
Neotypification of the name Crocus biflorus Mill. (Iridaceae) and its consequences in the taxonomy of the genus
No full textRecent phylogenetic investigations on the genus Crocus proved several infra-generic units predominantly within section Nudiscapus
to be para- or polyphyletic even at infra-specific level. In particular, the 23 “subspecies” of C. biflorus Mill. turned
out to be a polyphyletic assemblage grouping in very different clades and sub-groups. In addition, they were established under
the binomial Crocus biflorus, not yet typified. As first step, we neotypified this name. Then, through a phylogeny based
on the ETS region of the nuclear ribosomal (nr) DNA as an additional nuclear marker to the already available nrITS region,
we further demonstrated that all the “subspecies” represent independent evolutionary lineages. Therefore, all these taxa are
treated here at species level. To achieve this, 10 new combinations are proposed
Sorption of metals on humic acid
No full textThe sorption on humic acid (HA) of metals from an aqueous solution containing Hg(II). Fe(III), Pb, Cu, Al, Ni, Cr(III), Cd, Zn, Co and Mn, was investigated with special emphasis on effects of pH, metal concentration and HA concentration. The sorption efficiency tended to increase with rise in pH, decrease in metal concentration and increase in HA concentration of the equilibrating solution. At pH 2.4. the order of sorption was: Hg Fe Pb Cu=Al Ni Cr=Zn=Cd=Co=Mn. At pH 3.7. the order was: Hg and Fe were always most readily removed, while Co and Mn were sorbed least readily. There were indications of competition for active sites (CO2H and phenolic OH groups) on the HA between the different metals. We were unable to find correlations between the affinities of the eleven metals to sorb on HA and their atomic weights, atomic numbers, valencies, and crystal and hydrated ionic radii. The sorption of the eleven metals on the HA could be described by the equation Full-size image (1K), where Y = % metal removed by HA; X = mgHA; and A and B are empirical constant
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
No full textWe 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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