597 research outputs found
Robertsonidridae Rosso & Sciuto & Sinagra 2010, n. fam.
No full textFamily ROBERTSONIDRIDAE Rosso, n. fam. <p>DIAGNOSIS. — As for the genus (see below), but frontal wall including a pseudoporous or a centrally imperforate area, besides the row of marginal areolae.</p>Published as part of <i>Rosso, Antonietta, Sciuto, Francesco & Sinagra, Alessandro, 2010, Bertorsonidra n. gen. (Bryozoa, Cheilostomata) for Tremopora prenanti Gautier, 1955, a rare species from the Mediterranean, pp. 457-467 in Zoosystema 32 (3)</i> on page 459, DOI: 10.5252/z2010n3a7, <a href="http://zenodo.org/record/5167340">http://zenodo.org/record/5167340</a>
Tethysphytum antarcticum gen. et sp. nov. (Hapalidiales, Rhodophyta), a new non-geniculate coralline alga from Terra Nova Bay (Ross Sea, Antarctica): morpho-anatomical characterization and molecular phylogeny.
No full textOver the last decade, our knowledge of the phylogenetic and taxonomic diversity of coralline algae has greatly progressed thanks to the use of DNA sequence data. Despite this, in some geographic regions the knowledge of coralline diversity is still incomplete, because it is entirely based on traditional morpho-anatomical grounds; Antarctica can certainly be included among these regions. During an investigation of the marine phototrophic biodiversity of the Ross Sea, a crustose coralline alga was collected from two sites in Tethys Bay. The alga formed thin crusts adherent to cobbles at ~20 m depth and showed morpho-anatomical features typical of the order Hapalidiales, family Hapalidiaceae (cell fusions, zonate tetrasporangia produced in multiporate conceptacles, and apical plugs). Molecular phylogenies based on the psbA, rbcL and 18S rRNA genes showed that this alga formed a lineage in the family Hapalidiaceae for which a formal assignment at genus level was not yet available. The only other known member of the lineage was a coralline from the Balleny Islands, named as Hapalidiaceae sp. ASG448A, for which psbA and 18S rRNA sequences were deposited in GenBank without identification at genus and species level. Based on our results, we describe this lineage as the new genus Tethysphytum Sciuto, Moschin & Moro, with the single species Tethysphytum antarcticum Sciuto, Moschin & Moro. At present, morpho-anatomical characters do not allow for the discrimination of Tethysphytum from other similar genera of Hapalidiaceae. The discovery of a new genus suggests that the diversity of coralline algae in Antarctica may have been underestimated and that molecular data will be essential for future taxonomic assessments of this group within this region
<i>Bertorsonidra</i>n. gen. (Bryozoa, Cheilostomata) for<i>Tremopora prenanti</i>Gautier, 1955, a rare species from the Mediterranean
No full textRosso, Antonietta, Sciuto, Francesco, Sinagra, Alessandro (2010): Bertorsonidra n. gen. (Bryozoa, Cheilostomata) for Tremopora prenanti Gautier, 1955, a rare species from the Mediterranean. Zoosystema 32 (3): 457-467, DOI: 10.5252/z2010n3a7, URL: http://www.bioone.org/doi/abs/10.5252/z2010n3a
Polyphasic comparison of two cyanobacterial strains from different Italian thermal districts
No full textCyanobacteria are a group of prokaryotic microorganisms including both coccoid and
filamentous forms. Their prokaryotic nature, the presence of many cryptic species and the
coexistence of different classification systems make particularly difficult the taxonomic
identification of these organisms. Currently, more and more authors agree that a polyphasic
approach is necessary to correctly identify cyanobacterial strains (Komárek 2010, Moro et al.
2010, Sciuto et al. 2011). In the light of their capability to produce bioactive compounds and
since some studies suggest that the production of metabolites by cyanobacteria is species‐
specific or even strain‐specific (Biondi et al. 2008, Sharp et al. 2009), it is important to know the
cyanobacterial composition of certain environments, such as thermal springs exploited for
therapeutic purposes. For several years our laboratory has been involved in the
characterization of cyanobacteria colonizing the Euganean thermal District (Padova, Italy)
(Ceschi‐Berrini et al. 2004, Moro et al. 2007a, 2007b, 2010), highlighting how these organisms
are responsible for most of the mud therapeutic properties. Particularly, a filamentous strain,
isolated from this environment and characterized as Phormidium sp. ETS‐05 (where the
acronym ‘ETS’ stands for ‘Euganean Thermal Springs’), showed high contents of
polyunsaturated fatty acids with anti‐inflammatory properties higher than those of other
commonly used pharmaceuticals (Lalli et al. 2004). Ischia thermal District (Naples, Italy),
another Italian thermal environment, is known since ancient time and it is visited by thousands
of people for therapeutic purposes every year. However, scarce information is available on the
bioglea growing in this environment and on its therapeutic potential. For these reasons, and in
order to draw a parallel to the Euganean thermal District, recently we have started a study on
the biodiversity of Ischia thermal springs. This survey has led to a first publication on a
filamentous cyanobacterium, named Protolyngbya sp. strain ITD‐01 (where the acronym ‘ITD’
indicates ‘Ischia Thermal District’) (Sciuto et al. 2011). Here we present results about another
cyanobacterium isolated from Ischia District, the coccoid strain ITD‐02. The performed
molecular and phylogenetic analyses underlined how this organism is strictly related to another
coccoid cyanobacterium, isolated from the Euganean thermal District and previously
characterized as Cyanobacterium aponinum PCC 10605 (Moro et al. 2007b). From this starting
point, we have carried out a polyphasic approach to compare the two organisms, including
morphological, ultrastructural, biochemical, and physiological analyses. The obtained data allow
us to ascribe strain ITD‐02 to the genus Cyanobacterium, but the question regarding its
belonging to the species C. aponinum or to a different species is still open
Maryland Teacher Uses Comedy to Take on Moms for Liberty
No full textSunil Dasgupta talks with Baltimore area school teacher and comedian Alexa Sciuto who has become a TikTok star by lampooning Moms for Liberty, the anti-public education group which has been attacking teachers countrywide. Find her on TikTok @scooteredu. Music from Finster.https://open.spotify.com/episode/02EY2cLTh6bO2VnqhHWfw
Molecular and morphological characterization of Melanothamnus testudinis sp. nov. (Rhodophyta, Rhodomelaceae) and its distinction from Polysiphonia carettia.
No full textThe association between epizoic algae and animals is well known, and turtles are among the animals that most commonly host epibiont communities. The most studied algal component of the epizoic
communities found on turtles is represented by diatoms, while other algal taxa, like the Rhodophyta, are less investigated. During a survey started to study the epibionts associated with loggerhead turtles,
Caretta caretta, cared for at the WWF Sea Turtle Rescue Center of Lampedusa Island (Sicily, Italy), specimens of Rhodomelaceae (Rhodophyta) were collected for taxonomic investigation. The resulting
vegetative, reproductive, and molecular data of those specimens characterised the new species described here as Melanothamnus testudinis sp. nov. We also evaluated the holotype of Polysiphonia
carettia Hollenberg, an epibiont of C. caretta reported from the Mediterranean Sea. This investigation confirmed the distinction of M. testudinis from P. carettia and suggested that previous Mediterranean
and Canarian records of the latter species are probably M. testudinis
L'ontologia della persona nella prospettiva dell'ultimo Schelling
No full textSostituendo il termine di intellektuelle Anschauung con quello di Ekstase, Schelling compie un passo decisivo già a Erlangen per il superamento dell'idealismo. Vari interpreti hanno invece teso a negare questo passaggio e a leggere l’ultimo Schelling nel senso di una Vollendung (Schulz) o di una Aufhebung (Theunissen) dell’idealismo. Qui si propone di sostituire la tesi di una Vollendung o di una Aufhebung con quella di una Selbstaufgegebenheit dell’Idealismo
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