1,721,032 research outputs found
Primo convegno nazionale degli studenti di antropologia, preistoria e protostoria: Ferrara, 8-10 maggio 2004. Riassunti
No full textRiassunti del Primo Convegno Nazionale degli Studenti di Antropologia, Preistoria e Protostoria svoltosi a Ferrara, 8-10 Maggio 2004
THE FOREIGN THEORETICAL INFLUENCE IN ITALY VS THE DOUBLE-ENTRY METHOD. THE ACCOUNTING ACTIVITIES OF “SANTISSIMA ANNUNZIATA” HOSPITALS IN ABRUZZO (XVIII-XIX CENTURIES)
No full textThe reaction to nailing or cementing of the femur in rats. A microangiographic and fluorescence study.
No full textBone reaction to cement and to a cementless stem was studied in the rat femur with histological fluorescence and microangiographic techniques. Periosteal and endosteal apposition, and consequent remodelling, appeared as a reaction to reaming rather than caused by cement or a cementless stem. Every change in bone began with proliferation, progression and orientation of the vessels. Endosteal apposition was absent in cemented femurs because the entire medulla was occupied by the acrylic cement, but remodelling of the subendosteal cortex followed medullary revascularisation which was far advanced after 90 days. In cementless stems, endosteal apposition of primary woven bone and remodelling was the basis for bony ingrowth and anchorage through bony bridges. Our results suggest that the pattern of blood supply is relevant to the structural organisation of mature lamellar bone around the implant. Cemented stems have maximum anchorage and stability as soon as they are inserted, but this decreases with time as revascularisation occurs. Cementless stems can reach maximum integration later after insertion, and revascularisation is less critical because they usually do not fill the canal completely
The effects of mechanical forces on bones and joints. Experimental study on the rat tail.
No full textWe have used an experimental model employing the bent tail of rats to investigate the effects of mechanical forces on bones and joints. Mechanical strain could be applied to the bones and joints of the tail without direct surgical exposure or the application of pins and wires. The intervertebral disc showed stretched annular lamellae on the convex side, while the annulus fibrosus on the concave side was pinched between the inner corners of the vertebral epiphysis. In young rats with an active growth plate, a transverse fissure appeared at the level of the hypertrophic cell layer or the primary metaphyseal trabecular zone. Metaphyseal and epiphyseal trabeculae on the compressed side were thicker and more dense than those of the distracted part of the vertebra. In growing animals, morphometric analysis of hemiepiphyseal and hemimetaphyseal areas, and the corresponding trabecular bone density, showed significant differences between the compressed and distracted sides. No differences were observed in adult rats. We found no significant differences in osteoclast number between compressed and distracted sides in either age group. Our results provide quantitative evidence of the working of 'Wolff's law'. The differences in trabecular density are examples of remodelling by osteoclasts and osteoblasts; our finding of no significant difference in osteoclast numbers between the hemiepiphyses in the experimental and control groups suggests that the response of living bone to altered strain is mediated by osteoblasts
La fauna pleistocenica di Isernia La Pineta: analisi archeozoologica delle US 3S1-5
No full textAn archaeozoological and taphonomical analysis has been carried out on the macromammals remains coming from the sandy levels US 3S1-5 of the archaeological deposits of Isernia La Pineta (Molise, Italy). The study revealed that this assemblage has been modified by a relevant anthropic activity related to butchery actions as cutmarks and intentional bone breakage.
Thus, it is possibile to confirm that human groups that lived in Isernia La Pineta during the Middle Pleistocene, by their intensive activities of exploitation and processing animal carcasses, were the main factors of modification of the faunal assemblage
Histology of metal-bone interface: Considerations about interpretation of plastic embedded slides.
No full textThe interference of processing and preparation of histological slides for the study of morphology and morphometry of bone-implant interfaces was investigated in an experimental model, in which a titanium plate was inserted through the cortical bone into the medullary cavity of rat tibiae. The thickness of the sections, burr and notching of the cut border, and staining properties of the embedding resin were found to significantly influence the appearance of the bone-implant interface and, when morphometry was applied, the extent of direct bone-metal contact. The model of the interface resulting from this study is that of some bony processes abutting on the metal surface, while most of the contact is between metal and connective tissue or vascular spaces
Histology of the metal-bone interface: interpretation of plastic embedded slides.
No full textThe interference of processing and preparation of histological slides for the study of morphology and morphometry of bone-implant interfaces was investigated in an experimental model, in which a titanium plate was inserted through the cortical bone into the medullary cavity of rat tibiae. The thickness of the sections, burr and notching of the cut border, and staining properties of the embedding resin were found to significantly influence the appearance of the bone-implant interface and, when morphometry was applied, the extent of direct bone-metal contact. The model of the interface resulting from this study is that of some bony processes abutting on the metal surface, while most of the contact is between metal and connective tissue or vascular spaces
Divulgare l'archeologia. L'esempio dei laboratori didattici dell'Associazione Culturale ArcheoIdea per la valorizzazione e la diffusione culturale
No full textL’Associazione Culturale ArcheoIdea nasce nel 2002 allo scopo di valorizzare e divulgare la ricchezza del patrimonio archeologico molisano principalmente attraverso laboratori didattici di archeologia sperimentale. Tale intento programmatico risulta sensibilizzante nei confronti del pubblico che, spinto da un approccio più diretto alla conoscenza di una realtà lontana nel tempo e quanto mai affascinante, può inoltrarsi senza fatica nella comprensione degli aspetti più prettamente scientifici della preistoria. I contenuti vengono presentati sotto forma di insegnamenti, sia teorici che pratici, rivolti al grande pubblico, ma con particolare riguardo ai ragazzi delle scuole
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