1,720,961 research outputs found
Histopathology of Aquatic Animals
Get PDFHistopathological studies of aquatic animals refer to the microscopic examination of tissues and organs in order to detect deviations from the expected microscopic or macroscopic structure. Information obtained from the study of histomorphological lesions in aquatic animals can be a useful addition when determining the general state of health of aquatic animals, especially if chronic stressors and/or pathogens are present. Compared to mammals, postmortem autolysis progresses very rapidly in most aquatic organisms. This fact makes histopathological examination quite complex and demanding, not only in a histotechnical sense. A prerequisite for a successful study is the baseline knowledge of physiological processes and histological architecture of the studied species. Therefore, the aim of this Special Issue is to contribute to the current state of knowledge on the histopathology of aquatic animals and to provide a professional and encyclopedic tool for biologists and veterinarians
A review of the Diet and intestinal parasites of Pontic shad (Alosa immaculata Bennett, 1835) in the Danube River.
No full textThe feeding habits and intestinal parasites of Pontic shad (Alosa immaculata Bennet, 1835) from the Danube river were investigated in 2016 and 2017. A total of 180 individuals were collected and examined. The ranges of total and mean length of examined migrants were: 20.3±30.6 to 30.5±36.3 cm for Prahovo locality, and 17.9±26.7 to 27.5±36.7 cm for the Danube Delta, respectively. Parasitic species were identified in 16 fish specimens (18.6%) from Prahovo and 94 fish specimens (100.0%) in the Danube Delta. Representatives of the phylum Nematoda, namely specimens from the Anisakidae family, Contracaecum sp., Contracaecum siniperca Dogiel & Achmerov, 1946 and Contracaecum bidentatum (Linstow, 1899) Skrjabin, 1917 were determined. Identified parasitic fauna shows low diversity, but the intensity and prevalence of infestation are relatively high. With regard to feeding habits, representatives of macrozoobenthos were identified in the intestinal contents, mostly the insect component (Diptera, Ephemeroptera, Plecoptera, Odonata and Planaria). Macrozoobenthos were more present in the intestinal content of Pontic shad captured in Prahovo than in the Danube delta. Also, the intestines of fish specimens from Prahovo contained other structures, such as algae, detritus, sand, and a few terrestrial insects.
Even though the Pontic shad represents a commercially important fish species in the lower section of the Danube, research on it in this area has been performed only sporadically.Berillis P, Karapanagiotidis I, editors. Book of Proceedings: 3rd International Congress on Applied Ichthyology & Aquatic Environment: HydroMediT 2018; 2018 Nov 8-11; Volos, Greece. Nea Ionia Magnesia: University of Thessaly - School of Agricultural Sciences, Department of Ichthyology and Aquatic Environment; 2018. p. 224-7
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
Histologija creva pastrmke (oncorhynchus mykiss) pre i posle obroka
Get PDFPeharaste ćelije se nalaze u crevu riba, one sintetišu neutralne i sulfatne mucine i izlučuju sluz, podmazujući nesvareni materijal koji napreduje prema rektumu i štiteći sluzokožu digestivnog trakta. Promene u peharastim ćelijama creva riba posle obroka mogu pokazati odgovor na pojedinačni obrok obzirom na njihovu ulogu u procesu varenja. Cilj ovog istraživanja bio je procena promena histologije creva, pre hranjenja i 6h i 12 h posle obroka. Izgleda da 6h posle obroka kada je vrhunac sinteze proteina kod pastrmke, proces varenja je u toku, a peharaste ćelije izlučuju sluz pa se njihova veličina smanjuje. Slične dimenzije ovih ćelija pre obroka i 12 h posle ishrane potvrđuju da pastrmku treba hraniti 2 puta dnevno, a da drugo hranjenje treba obaviti 6 sati posle prvog. Ovo istraživanje daje više uvida u upravljanje ishranom u procesu uzgoja pastrmki
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
Lithium side effects at the collagen of different tissues. Electron microscopy and image proccesing
No full textHistopathology of Aquatic Animals
Get PDFHistopathology is the study of changes in any tissue associated with a disease or disorder.
The word came from ancient Greek words: ´ιστóς (histos) = tissue, πα´θoς (pathos) = disease,
and λoγι´α (logia) = word. It involves the examination of tissues and cells under a microscope in order to identify the alterations to the normal structure of tissues (and perhaps their
etiology). Information obtained from the study of histopathological/histomorphological
lesions in aquatic animals can be a useful addition when determining the general state
of health of aquatic animals, especially if chronic stressors and/or pathogens are present.
Compared to mammals, postmortem autolysis progresses very rapidly in most aquatic
organisms. This fact makes histopathological examinations quite complex and demanding,
not only in a histotechnical sense. A prerequisite for a successful study is the baseline
knowledge of physiological processes and histological architecture of the studied species.
The aim of this Special Issue was to contribute to the current state of knowledge
on the histopathology of aquatic animals and to provide a collection of novel articles for
biologists/veterinarians/animal scientists/other experts. The topic is extremely broad, and
therefore, the published manuscripts are also diverse in terms of research areas, employed
methodology and investigated species. Eight original studies and two review articles are
part of this Special Issue and their short overview by two Guest Editors is given belo
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
- …
