1,720,977 research outputs found
On the growth rings on Histioteuthis bonnellii (Férussac, 1835) upper beaks
No full textThe concentric rings present in the internal lateral wall of upper beaks of 109 Histioteuthis
bonnellii (Cephalopoda: Histioteuthidae) caught in the south Sardinian waters were counted. From 142
to 409 and from 176 to 437 rings were counted in males and females, respectively. No difference was
found between the number of rings among sexes (p>0.05). One year life-span was estimated in both
sexe
Pluriannual observations on Chattonella (Raphidophyceae) blooms and related environmental conditions in a Mediterranean lagoon (Santa Giusta Lagoon, Sardinia, Italy)
No full text
Tagging Octopus vulgaris (Octopoda: Octopodidae) in an area of central western Sardinian waters
No full textPreliminary data on growth and movements of Octopus vulgaris wild populations of the Mediterranean Sea recorded during a tagging program in the central western Sardinian waters were reported and compared with literature
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
Identification of Chattonella species (Raphidophyceae) through molecular methods on fixed samples from Santa Giusta Lagoon (Sardinia, Italy).
No full textThe genus Chattonella Biecheler (Raphidophyceae) has a worldwide distribution and includes harmful species, which cause extensive kills of farmed and wild fishes, with very important ecological damage and economic losses. Only two species are currently taxonomically accepted as members of the genus: C. marina (Subrahmanyan) Hara & Chihara and Chattonella subsalsa Biecheler. These two species show very similar cell morphology, with some characters that overlap, such as the length and the width of the cell. Therefore, their certain identification can be obtained only through the ultrastructure and genetics. The mechanism of toxic action is known better for C. marina but, even if a number of different killing pathways have been described, the debate is still ongoing. Potential deleterious effects of C. subsalsa are less known and only few studies indicate the production of toxic substances (e.g. brevitoxins, peroxide radicals).
Chattonella spp. blooms associated with fish-kill events were observed in Sardinian lagoons since the middle of nineties. The first observation occurred in Santa Giusta Lagoon (Gulf of Oristano), during a massive fish mortality case, between the end of July and August 1994. The presence of Chattonella spp. was well documented also in 1998, 1999 and 2010, during further harmful blooms always in Santa Giusta Lagoon, which belongs to the LTER-Italy network. The presence of C. subsalsa was established in samples collected in Santa Giusta Lagoon in 2005 through molecular methods, when kill-fish events were absent.
The main objective of this work is to investigate on which species were present during the fish-kill events in Santa Giusta Lagoon using fixed samples (with Lugol's iodine or formalin) collected at the time of the events. The analysis is based on the method developed by Connel (2002), which allows a rapid identification of Raphidophyceae using three-primer PCR amplification of nuclear internal transcribed spacer (ITS) regions. The internal transcribed spacer region of the nuclear rRNA gene was used to discriminate among the marine raphidophyte species, so it’s a useful support especially when cells cannot be identified morphologically and fixation methods have destroyed cellular RNA content.
Our study is a first tentative to apply the method to natural samples in which only one or both the investigated Chattonella species may be present
Dinoflagellate Cyst Assemblages in Surface Sediments from Three Shallow Mediterranean Lagoons (Sardinia, North Western Mediterranean Sea)
No full textIdentification of Chattonella species (Raphidophyceae) through molecular methods on fixed samples from Santa Giusta Lagoon (Sardinia, Italy).
No full textThe genus Chattonella Biecheler (Raphidophyceae) has a worldwide distribution and includes harmful species, which cause extensive kills of farmed and wild fishes, with very important ecological damage and economic losses. Only two species are currently accepted taxonomically as members of the genus: C. marina (Subrahmanyan) Hara & Chihara and Chattonella subsalsa Biecheler. These two species show very similar cell morphology, with some characters that overlap, such as the length and the width of the cell. Therefore, their certain identification can be obtained only through the ultrastructure and genetics. The mechanism of toxic action is known better for C. marina but, even if a number of different killing pathways has been described, the debate is still ongoing. Potential deleterious effects of C. subsalsa are less known and only few studies indicate the production of toxic substances (e.g. brevitoxins, peroxide radicals).
Chattonella spp. blooms associated with fish-kill events were observed in Sardinian lagoons since the middle of nineties. The first observation occurred in Santa Giusta Lagoon (Gulf of Oristano), during a massive fish mortality case, between the end of July and August 1994. The presence of Chattonella spp. was well documented also in 1998, 1999 and 2010, during further harmful blooms always in Santa Giusta Lagoon, which belongs to the LTER-Italy network. The presence of C. subsalsa was established in samples collected in Santa Giusta Lagoon in 2005, when kill-fish events were absent.
The main objective of this work is to investigate on which species were present during the fish-kill events in Santa Giusta Lagoon using fixed samples (with Lugol's iodine or formalin) collected at the time of the events. The analysis is based on the method developed by Connel (2002), which allows a rapid identification of Raphidophyceae using three-primer PCR amplification of nuclear internal transcribed spacer (ITS) regions. The internal transcribed spacer region of the nuclear rRNA gene was used to discriminate among the marine raphidophyte species, so it’s a useful support especially when cells cannot be identified morphologically and fixation methods have destroyed cellular RNA content.
Our study is a first tentative to apply the method to natural samples in which only one or both the investigated Chattonella species may be present
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
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