Search results for "ufo"
showing 10 items of 71 documents
Strong reproductive barriers in a narrow hybrid zone of West-Mediterranean green toads (Bufo viridis subgroup) with Plio-Pleistocene divergence
2010
Abstract Background One key question in evolutionary biology deals with the mode and rate at which reproductive isolation accumulates during allopatric speciation. Little is known about secondary contacts of recently diverged anuran species. Here we conduct a multi-locus field study to investigate a contact zone between two lineages of green toads with an estimated divergence time of 2.7 My, and report results from preliminary experimental crosses. Results The Sicilian endemic Bufo siculus and the Italian mainland-origin B. balearicus form a narrow hybrid zone east of Mt. Etna. Despite bidirectional mtDNA introgression over a ca. 40 km North-South cline, no F1 hybrids could be found, and nu…
Post-Messinian evolutionary relationships across the Sicilian channel: Mitochondrial and nuclear markers link a new green toad from Sicily to African…
2008
19 páginas, 6 figuras y 3 tables
Blood Anticoagulant Activity of Sulphated Ovular Mucins of Amphibians
1957
THE mucin constituting the gelatinous layer which envelops the eggs of Bufo bufo, if digested with papain and then sulphated, shows a marked anticoagulant activity on the fibrinogen and the whole blood plasma1. A similar anticoagulant activity has now been shown by the ovular mucins of other species of amphibians, sulphated without any previous proteolysis.
L'architettura
2019
Esso costituisce, di fatto, un vero e proprio punto di riferimento per l’intera cultura scientifica e illuminista di Palermo e dell’intera Isola. L’indagine su tale “presenza” svela una fitta trama di accadimenti, ricca di coincidenze, che ci aiuta a comprendere meglio il clima culturale di quegli anni. Sono abbastanza note le vicende che legano, direttamente o indirettamente, l’Orto Botanico a Giuseppe Venanzio Marvuglia, a Carlo Giachery e a Giovan Battista Filippo Basile, meno note quelle riguardanti docenti come Domenico Marabitti, Cristoforo Cavallaro e Antonino Gentile o architetti come Salvatore Attinelli, Pietro Trombetta e Domenico Cavallari Spadafora. Léon Dufourny e Vincenzo Tine…
Palermo tra innesti e piante originarie
2019
Se vi è qualcosa di profondamente e visceralmente connaturato alla stessa dimensione esistenziale della città di Palermo, sin dalle sue molteplici e stratificate origini fenicio-puniche, questo è certamente il concetto di “innesto”. Ed in analogia con l’innesto agrario, cioè con la pratica del far concrescere in una pianta esistente una parte di un altro vegetale, al fine di rafforzare il primo soggetto ma modificandolo verso un genere diverso da quello iniziale, l’intera storia millenaria della città potrà essere riguardata come il frutto di continue, cicliche introduzioni di modelli architettonici e urbani esogeni, declinati rispetto alle contingenze culturali autoctone dei diversi esempi…
Fate of the herbicides glyphosate, glufosinate-ammonium, phenmedipham, ethofumesate and metamitron in two Finnish arable soils.
2006
The fate of five herbicides (glyphosate, glufosinate-ammonium, phenmedipham, ethofumesate and metamitron) was studied in two Finnish sugar beet fields for 26 months. Soil types were sandy loam and clay. Two different herbicide-tolerant sugar beet cultivars and three different herbicide application schedules were used. Meteorological data were collected throughout the study and soil properties were thoroughly analysed. An extensive data set of herbicide residue concentrations in soil was collected. Five different soil depths were sampled. The study was carried out using common Finnish agricultural practices and represents typical sugar beet cultivation conditions in Finland. The overall obse…
Die Bedeutung des Serumeiweissbildes zur Diagnose vonBufo calamita Laur.,Bufo viridis Laur. und deren Bastarden (Amphibia, Anura, Bufonidae)
1973
Electrophoretic investigations of the serum protein patterns of natterjacks (Bufo calamita Laur.) from the Iberian Peninsula and from Western and Central Europe, and of green toads (Bufo viridis Laur.) from Central Europa, Asia Minor and North Africa show that the two species differ disctinctly in the position of their albumin fractions. The identification of problematic specimens can result from the production of mixed serum with specimens of both species. As the albumin fraction of hybrids is doubled according to this method, it is also suitable for demonstrating the existence of such hybrids in natural populations.
Analyse des akustischen Geschlechtererkennungsmechanismus (Befreiungsrufe) bei Kröten (GenusBufo)
1968
The release calls of male European toads (B. bufo L.,B. calamita Laur.,B. viridis Laur.) have been described and recorded in the form of spectrograms and oscillograms. While only 1 type of release call is uttered byB. bufo, inB. viridis andB. calamita 2 and 3 types respectively were found. The latter 2 species show a close relationship,B. calamita being the most highly developed toad in Europe.
Instituere e instruere in D.1.2.2.43 e il modello del docere respondendo
2020
Attraverso l'esame di un noto brano dell'Enchiridion di Pomponio (D. 1.2.2.43) e di due brani di Cicerone (Brut. 306; or. 42) si assume, contro autorevole e consolidata opinione, che già (al più tardi) agli inizi del I sec. a.C. al modello di insegnamento del diritto comunemente designato 'docere respondendo' si era affiancato un insegnamento autonomo, svincolato dalla prassi del responso.
Cytotoxicity and antimitotic activity of Rhinella schneideri and Rhinella marina venoms.
2019
Abstract Ethnopharmacological relevance Rhinella schneideri and Rhinella marina are toad venoms distributed in different parts of the world, including Brazil, Columbia and amazon. Venoms extracted from different species have many clinical applications such as antimicrobial cardiotonics and treatment of cancer. Aim of the study; In this study, we aim to investigate the effect of venoms extracted from R. schneideri and R. marina on cancer cells and verify possible mechanism of action. Material and method Cytotoxicity analyses was performed using the resazurin reduction assay, where different concentrations of venoms were tested against sensitive CCRF-CEM and P-gp overexpressing ADR/CEM5000 le…