1,721,026 research outputs found
FIGURE 2 in Kinyongia asheorum sp. n., a new montane chameleon from the Nyiro Range, northern Kenya (Squamata: Chamaeleonidae)
No full textFIGURE 2. Head of the holotype of Kinyongia asheorum n. sp. (male) dorsally.Published as part of Necas, Petr, Sindaco, Roberto, Koŕený, Luděk, Kopečná, Jana, Malonza, Patrick Kenyatta & Modrý, David, 2009, Kinyongia asheorum sp. n., a new montane chameleon from the Nyiro Range, northern Kenya (Squamata: Chamaeleonidae), pp. 41-50 in Zootaxa 2028 (1) on page 44, DOI: 10.11646/zootaxa.2028.1.4, http://zenodo.org/record/532320
FIGURE 5. Paratype 1 in Kinyongia asheorum sp. n., a new montane chameleon from the Nyiro Range, northern Kenya (Squamata: Chamaeleonidae)
No full textFIGURE 5. Paratype 1 of Kinyongia asheorum n. sp. (female) photographed in its natural habitat immediately after its discovery.Published as part of Necas, Petr, Sindaco, Roberto, Koŕený, Luděk, Kopečná, Jana, Malonza, Patrick Kenyatta & Modrý, David, 2009, Kinyongia asheorum sp. n., a new montane chameleon from the Nyiro Range, northern Kenya (Squamata: Chamaeleonidae), pp. 41-50 in Zootaxa 2028 (1) on page 46, DOI: 10.11646/zootaxa.2028.1.4, http://zenodo.org/record/532320
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
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
Leishmania of the subgenus Mundinia: genetical analysis and experimental infections of rodents and vectors.
Full text linkLeishmaniasis is a human and animal disease caused by digenetic parasites of the genus Leishmania, which is now divided into 4 subgenera - L. (Leishmania), L. (Viannia), L. (Sauroleishmania) and L. (Mundinia). Subgenus Mundinia was established in 2016 and consists of 5 species - L. enriettii and L. macropodum are parasites of wild mammals and L. martiniquensis, L. orientalis and unnamed L. sp. from Ghana are infectious to humans. Mundinia are geographically widely dispersed, their distribution covers all continents, except of Antarctica. Despite phlebotomine sand flies (Diptera: Psychodidae) also biting midges (Diptera: Ceratopogonidae) are supposed to be involved in transmission of these species, which is a unique feature for this subgenus. But there is little to no current information on natural reservoir hosts and vector species for any Mundinia species. In this thesis we tested possible vectors and potential model organisms (Guinea-pigs) and reservoir hosts of Mundinia species by experimental infections. We used 3 sand fly species sharing geographical distribution with respective Mundinia species and available in our laboratory for experimental infections. Sand flies from Australia had never been colonised so we used the permissive vector Lu. migonei for testing development of L. macropodum...
Trypanosomes of green frogs (genus Pelophylax)
Full text linkAnuran trypanosomes are the first ever observed and described trypanosomes and Trypanosoma rotatorium from frogs of the genus Pelophylax is a type species of the genus Trypanosoma. Despite the early discovery, they are being neglected in terms of current descriptive studies when compared to other trypanosomes, although their diversity and prevalence in anurans are quite high. Anuran trypanosomes, which are significantly larger than their mammal relatives, display a high rate of polymorphism and pleiomorphism; however, without any explanations. Because of the amphibious nature of frogs, the vectors of anuran trypanosomes are both aquatic leeches and terrestrial bloodsucking insects. This thesis which aims at widening the scope of knowledge about this neglected group of trypanosomes focuses on trypanosomes from frogs of the genus Pelophylax found in Central Europe and the Balkan Peninsula. An overall prevalence of 71% was found in 981 individuals and a total of thirteen trypanosome species were detected, eight of which are new to science. Significantly higher diversity was found in frogs originating from the Balkan Peninsula; however, no host specificity of trypanosomes was detected. It was not possible to unambiguously prove the relationship between morphospecies and genospecies. On the contrary, I...Žabí trypanosomy představují první pozorované a následně popsané trypanosomy a Trypanosoma rotatorium ze zelených skokanů je typovým druhem celého rodu Trypanosoma. I přes jejich prvenství v rámci popisu mezi ostatními trypanosomami se jim věnuje v současné době jen málo pozornosti, přestože se v žabách vyskytují s překvapivě vysokou diverzitou a prevalencí. U žabích trypanosom, které jsou často nápadně větší než savčí druhy, je známá stále nevysvětlená vysoká míra polymorfismu a pleomorfismu. Díky obojživelnému způsobu života jsou za přenašeče žabích trypanosom považovány jak vodní pijavice, tak suchozemský krevsající hmyz. Tato diplomová práce, která má za cíl rozšířit znalosti o této opomíjené skupině trypanosom, je zaměřena na trypanosomy zelených skokanů (rod Pelophylax), a to ve střední Evropě a na Balkánském poloostrově. U 981 jedinců byla zjištěna celková prevalence dosahující 71 % a celkově bylo detekováno třináct druhů trypanosom, z toho osm je pro vědu nových. Signifikantně větší diverzita byla zjištěna u žab na Balkánském poloostrově, naopak hostitelská specifita trypanosom pro jednotlivé vyšetřované druhy skokanů se neprokázala. V této práci se mi nepodařilo jednoznačně prokázat vztah mezi morfospecies a genospecies, naopak vzhledem k velké morfologické variabilitě a častým směsným...Department of ParasitologyKatedra parazitologiePřírodovědecká fakultaFaculty of Scienc
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