196,179 research outputs found
L’instrumentum in agricoltura e pastorizia
No full textSi analizzano in particolare i manufatti rinvenuti presso il villaggio medievale abbandonato di Apigliano (Martano-LE) riferibili all'ambito delle attività agricole. La disamina delle evidenze è condotta tenendo conto anche delle contestuali indagini archeobotaniche e di considerazioni di carattere iconografico
Skeletal matrices, muci, and the origin of invertebrate calcification
No full textThe sudden appearance of calcified skeletons among many different invertebrate taxa at the Precambrian-Cambrian transition may have required minor reorganization of preexisting secretory functions, In particular, features of the skeletal organic matrix responsible for regulating crystal growth by inhibition may be derived from mucous epithelial excretions, The latter would have prevented spontaneous calcium carbonate overcrusting of soft tissues exposed to the highly supersaturated Late Proterozoic ocean [Knell, A, H., Fairchild, I,J, & Swett, K, (1993) Palaios 8, 512-525], a putative function for which we propose the term ''anticalcification,'' We tested this hypothesis by comparing the serological properties of skeletal water-soluble matrices and mucous excretions of three invertebrates - the scleractinian coral Galaxea fascicularis and the bivalve molluscs Mytilus edulis and Mercenaria mercenaria. Crossreactivities recorded between muci and skeletal water-soluble matrices suggest that these different secretory products have a high degree of homology. Furthermore, freshly extracted muci of Mytilus were found to inhibit calcium carbonate precipitation in solution
Oxygen Extraction Ratio (OER) as a Measurement of Hemodialysis (HD) Induced Tissue Hypoxia: A Pilot Study
No full textHD tissue hypoxia associates with organ dysfunctions. OER, the ratio between SaO2and central-venous-oxygen-saturation, could estimate oxygen requirements during sessions, but no data are available. We evaluated OER behavior in 20 HD patients with permanent central venous catheter (CVC) as vascular access. Pre-HD OER (33.6 ± 1.4%; M ± SE) was higher than normal (range 20-30%). HD sessions increased OER to 39.2 ± 1.5% (M ± SE; p 40%. In HD patients with CVC as vascular access, OER is a cheap, easily measurable and repeatable parameter useful to assess intradialytic hypoxia, and a potential biomarker of HD related stress and morbidity, helpful to recognize patients at increased risk of mortality
"Carbon grains produced in partially hydrogenated atmosphere and their astrophysical relevance"
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