1,721,023 research outputs found
Poster: Heavy metals chronological and areal trends of shelf marine sediments in Central Tyrrhenian Sea (Tuscany- Italy)
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A recent aminochronology of Pleistocene mammals from Rome area and Isernia - La Pineta deposits (Italy).
No full textLa serie marina olocenica di Cafieri (Isola d'Ischia): implicazioni vulcano-tettoniche e geomorfologiche
No full textThe Holocene marine sediments outcropping at Cafieri, along the north-eastern coast of the Ischia island have been studied in order to define sedimentation environment, age, and relationship with the surrounding volcanic formations. The studied section, constituted by stratified tufites, ends upwards with a beach, previously attributed to the first part of the VIII century B.C., corresponding to an uplifted marine erosion surface, fossilized by pyroclastic and lava formations. A second uplift displayed a 2nd order erosion surface, subdivided into two, bordering the Cafieri outcrop. The age of the sediments as obtained with the Radiocarbon method applied to the fauna of the tufites, is less than 10,000 years B.P. The sedimentation environment as established by means of benthic foraminifers and ostracods assemblages, corresponds to a depth range between -50 and -80 m
Poster: Inquinamento atmosferico a Roma: un modello basato sull'analisi del Radiocarbonio e di parametri funzionali e chimici in foglie di specie sempreverdi
No full textLa serie marina olocenica di Cafieri (Isola d'Ischia): implicazioni vulcano-tettoniche e geomorfologiche
No full textThe Holocene marine sediments outcropping at Cafieri, along the north-eastern coast of the Ischia island have been studied in order to define sedimentation environment, age, and relationship with the surrounding volcanic formations. The studied section, constituted by stratified tufites, ends upwards with a beach, previously attributed to the first part of the VIII century B.C., corresponding to an uplifted marine erosion surface, fossilized by pyroclastic and lava formations. A second uplift displayed a 2nd order erosion surface, subdivided into two, bordering the Cafieri outcrop. The age of the sediments as obtained with the Radiocarbon method applied to the fauna of the tufites, is less than 10,000 years B.P. The sedimentation environment as established by means of benthic foraminifers and ostracods assemblages, corresponds to a depth range between -50 and -80 m
Ecological anD Cultural Relevance of the Recent New Radiocarbon Dates from Lybian Sahara. In: Origin and Early Development of Food Producing Cultures in North -Eastern Africa, Polish Academy of Sciences
No full textA review of toxicity testing protocols and endpoints with Artemia spp
No full textArtemia spp. is an historically popular biological model still requiring an official internationally basedstandardization. Several endpoints are currently available. Short-term acute endpoints include biomarker(acetylcholinesterase; heat stress proteins; lipid peroxidation; thiobarbituric acid reactive substances;thioredoxin reductase; glutathione-peroxidase; glutathione S-transferase; glutathione reductase; alde-hyde dehydrogenase; and adenylpyrophosphatase and Fluotox), hatching (dry biomass, morphologicaldisorders and size), behavioral (swimming speed and path length), teratogenicity (growth), and immo-bilization (meaning mortality after 5–30 s observation). Long-term chronic tests focus on growth,reproduction and survival or mortality after 7–28 d exposure from larval to adulthood stage. We analyzedeach test looking at its endpoint, toxicant and experimental design including replicates, exposure time,number of exposed cysts or organisms and their relative life stage, exposure conditions during hatch-ing and testing (salinity, pH, light intensity, aeration dilution media, and food supply), type of testingchambers, and quality assurance and quality control criteria. Similarities and differences between theidentified approaches were highlighted. Results evidenced that hatching 24 h short-term and 14 d long-term mortality are the most promising Artemia spp. protocols that should go forward with internationalstandardization
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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