1,720,954 research outputs found
LEUCOCHLORIDIUM SPP. MORPHOLOGY AND SPOROCYST DEVELOPMENT IN SNAIL TENTACLES
No full textLeucochloridium sp. pripada razredu metilja (Trematoda) koji su česti nametnici u dišnom, probavnom,
mokraćnom i krvoţilnom sustavu kraljeţnjaka. Leucochloridium sp. jedan je od najpoznatijih nametnika
zbog karakterističnog ţivotnog ciklusa i neobičnih sporocista pomoću kojih nastoji privući konačnog
domadara. Sporociste koje razvijaju ţivo su obojene, razgranate i sadrţavaju zrele leţne vrećice ispunjene
metacerkarijama. Središnji dio sporociste ima reproduktivnu i trofičku funkciju dok se leţne vrećice smatraju
svojevrsnim uzgojnim komorama. Sporociste mogu biti različitog obojenja, ovisno o vrsti, a pigmentacija se
mijenja pod utjecajem okolišnih čimbenika ili tijekom ontogeneze. Istraţivanja provedena na različitim
kontinentima ukazuju da se obojenja sporocista europskih populacija razlikuju od primjerice jedinki
pronaĎenih u Japanu, premda u anatomskim obljeţjima izmeĎu navedenih populacija nisu uočene razlike.Leucochloridium sp. belongs to the class of flukes (Trematoda) that parasite in the respiratory, digestive,
urinary and vascular systems of vertebrates. Leucochloridium sp. is a well-known parasite due to its
characteristic life cycle and unusual sporocysts with which it seeks to attract its final host. The sporocysts
they develop are vividly stained, branched, and contain mature broodsacs filled with metacercariae. The
central part of the sporocyst has a reproductive and trophic function while broadsacs act as brood chambers.
Sporocysts can have different colours, which is often species-specific, but the colour can change under the
influence of environmental factors or during ontogenesis. Research conducted on different continents
indicated that the sporocysts colouration of European populations differs from individuals found in Japan, but
no differences were observed in the anatomical features between these populations
Structure and dynamics of the zooplankton winter community in the river floodplain (Kopački rit Nature park)
No full textZima se dugo smatrala manje značajnim razdobljem u ekologiji zooplanktona sa smanjenom brojnošću i brzinom
rasta. Ipak, sve je više dokaza da je zimsko razdoblje od ključne važnosti za sezonsku dinamiku zajednica
planktona, a ne samo razdoblje mirovanja. Cilj istraživanja bio je utvrditi kvalitativni i kvantitativni sastav
zajednice rašljoticalaca i veslonožaca te njihov razvoj na lokalitetima jezero Sakadaš i kanal Čonakut u Parku
prirode Kopački rit tijekom zime. Uzorkovano je od siječnja do ožujka 2020. godine tjednom dinamikom te su
analizirani struktura i brojnost zajednice, fizikalno-kemijski parametri vode te indeks raznolikosti. U provedenom
istraživanju utvrđena je prisutnost razvojnih stadija veslonožaca, tj. nauplia i ciklopoidnih i kalanoidnih
kopepodita, jedne vrste ciklopoidnih veslonožaca te četiri vrste rašljoticalaca. Najbrojniji su bili razvojni stadiji
veslonožaca, dok su najmanje zastupljeni bili rašljoticalci. Nije zabilježena statistički značajna razlika u brojnosti
analiziranih zajednica no veća je biološka raznolikost zajednice utvrđena u jezeru Sakadaš. Fizikalno-kemijski
parametri koji su ukazivali na povezanost s brojnošću određenih vrsta su zasićenost kisikom, koncentracija kisika,
dubina vode, nitrati i pH. Kao značajan čimbenik u strukturiranju zajednice bila je i poplava koja je uzrokovala
efekt ispiranja zajednice i promijenila fizikalno-kemijske parametre istraživanih sustava.Winter has long been considered a less significant period in zooplankton ecology, with lower abundance and
growth rates. However, there is growing evidence that winter is critical to the seasonal dynamics of plankton
communities, not just the dormant season. The aim of the study was to determine the qualitative and quantitative
composition of the cladocera and copepoda community and its development in the localities of Lake Sakadaš and
the Čonakut Channel in the Kopački rit Nature Park during winter. From January to March 2020, weekly samples
were taken and community structure and abundance, physico-chemical water parameters and diversity index were
analyzed. The survey conducted revealed the presence of developmental stages of copepods, i.e. nauplii, cyclopoid
and calanoid copepodites, one species of cyclopoid copepods and four species of cladocerans. Developmental
stages of copepods were the most numerous, while cladocerans were the least represented. No statistically
significant difference in the number of communities studied was found, but the greater community biodiversity
was found in Lake Sakadaš. Physico-chemical parameters that indicated a relationship with the presence of certain
species were oxygen saturation, oxygen concentration, water depth, nitrates and pH. An important factor in the
structuring of the zooplankton was the flood, which caused a washout of the community and changed the physicochemical parameters of the studied systems
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
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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