1,720,976 research outputs found
The use of bird feathers for the monitoring of cadmium pollution
No full textThe cadmium contamination mechanism in bird feathers was investigated using starlings fed with diets containing 10 and 50 ppm Cd for five months. The experiment started about two months before the beginning of the annual complete feather molt and lasted until most of the birds completed the molt of the primaries. Concentrations of Cd in liver, kidney, and uropygial gland were highly correlated, but uropygial gland concentration was about 100 times lower. Cadmium was found both in old and new feathers, in a dose-related manner. Old feathers showed higher metal concentrations than new ones and primaries higher than secondaries. Feather Cd concentration correlated with Cd concentration in liver, kidney, and the uropygial gland. The use of bird feathers are, therefore, a reliable method for monitoring cadmium pollution, but differences between feather type and age must be considered to correctly interpret data collected in the field
A case report of pulmonarymyiases by Megaselia scalaris (Loew) (Diptera: Phoridae) in a python from areptylarium.
No full textLeatherback turtles (Dermochelys coriacea) in Italy and in the Mediterranean basin
No full textA total of 411 records of leatherback turtles (Dermochelys coriacea) are reviewed for the whole of the Mediterranean, of which 57 are new records reported from Italy. Data on anthropogenic factors, spatio-temporal distribution, size and maturity are discussed. Leatherback turtles are most frequently captured incidentally by fishing nets. Specimens seem to concentrated in specific areas rather than being evenly distributed along a linear gradient from the Atlantic. Moreover, they frequent the Mediterranean all the year round without clear seasonal patterns of immigration or emigration. However, seasonal movements may occur between northern and southern coasts. Specimens entering the Mediterranean are likely to be large juveniles and adults of both sexes
Recupero delle collezioni storiche di molluschi appartenenti al museo di zoologia dell'Università di Padova
No full textEffects of chronic dietary cadmium on hepatic glutathione levels and glutathione peroxidase activity in starlings
No full textRestauro e catalogazione della storica collezione erpetologica del Museo di Zoologia dell’Università di Padova
Full text linkIl Museo di Zoologia dell’Università di Padova, possiede una collezione storica i cui reperti più antichi risalgono
al Museo Vallisneriano (XVII-XVIII sec.). Tra questi è presente l’esemplare più importante dell’intera collezione,
l’olotipo di Dermochelys coriacea (Vandelli, 1761), donato da Papa Clemente XIII all’Ateneo patavino nel 1760.
La collezione erpetologica, oggetto di studio negli ultimi tre anni, risale per lo più al XIX secolo e consta in totale
di 370 unità (per la maggior parte esemplari in liquido, alcuni tassidermizzati e pochi preparati osteologici),
recentemente restaurate e catalogate.The Museum of Zoology of the University of Padova holds an historical collection whose earliest findings date back to Vallisneri’s
Museum (XVII-XVIII Century). Among them, the most important specimen is the holotypus of Dermochelys coriacea (Vandelli,
1761) donated by the Pope Clemente XIII to the University of Padova in the same year. The herpetological collection, whose study has
been resumed in the last three years, dates back mainly to XIX century and consists of 370 samples (mostly specimens preserved in liquid,
some stuffed animals and a few osteological preparations) recently restored and classified
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
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