Search results for "arco"

Matrix metalloproteinases 2 and 9, and extracellular matrix in Kaposi's sarcoma

2010

Matrix metalloproteinases (MMPs) are associated with Kaposi's sarcoma (KS) tumorigenesis and may contribute to the mechanism of KS invasive growth. To date, only a few MMPs have been studied in KS lesions, and exactly which MMPs are involved in KS development and progression remains unanswered. However, MMPs 2 and 9 have been associated with different phases of angiogenesis, but their role in the proteolytic modification of the extracellular matrix has not been investigated. The results of this study confirm that MMPs, specifically MMP-2 and MMP-9, can contribute to angiogenesis by disrupting the vessel basement membrane and other extracellular matrix barriers, and enabling endothelial cell…

Biological tolerance of different materials in bulk and nanoparticulate form in a rat model: sarcoma development by nanoparticles

2006

In order to study the pathobiological impact of the nanometre-scale of materials, we evaluated the effects of five different materials as nanoparticulate biomaterials in comparison with bulk samples in contact with living tissues. Five groups out of 10 rats were implanted bilaterally for up to 12 months with materials of the same type, namely TiO 2 , SiO 2 , Ni, Co and polyvinyl chloride (PVC), subcutaneously with bulk material on one side of the vertebral column and intramuscularly with nanoparticulate material on the contralateral side. At the end of each implantation time, the site was macroscopically examined, followed by histological processing according to standard techniques. Malign…

I borghi interni in Sicilia: recupero dell’identità e strategie di valorizzazione

2021

La promozione di studi e ricerche volti al recupero e alla valorizzazione delle aree interne marginali e dei centri minori, indirizzati a supportare Regioni, Comuni e cittadinanza locale, estremamente utili all’individuazione di soluzioni più opportune per lo sviluppo sostenibile e la valorizzazione di luoghi e architetture, ha suggerito la ricerca che in questo saggio si vuole illustrare, rivolta a investigare – in prima battuta e in termini generali – i caratteri identitari dell’area montana interna siciliana delle “Madonie” e nel dettaglio, invece, il borgo “Pusterna” del comune di Petralia Sottana. Si verificheranno, per quest’ultimo, i livelli di comfort indoor raggiungibili nell’ambit…

BIOCHARS IN SOILS: TOWARDS THE REQUIRED LEVEL OF SCIENTIFIC UNDERSTANDING

2017

The special issue on Biochar as an Option for Sustainable Resource Management Key priorities in biochar research for future guidance of sustainable policy development have been identified by expert assessment within the COST Action TD1107. The current level of scientific understanding (LOSU) regarding the consequences of biochar application to soil were explored. Five broad thematic areas of biochar research were addressed: soil biodiversity and ecotoxicology, soil organic matter and greenhouse gas (GHG) emissions, soil physical properties, nutrient cycles and crop production, and soil remediation. The highest future research priorities regarding biochar’s effects in soils were: functional …

Porous titania surfaces on titanium with hierarchical macro- and mesoporosities for enhancing cell adhesion, proliferation and mineralization

2014

Titanium received a macroporous titania surface layer by anodization, which contains open pores with average pore diameter around 5 μm. An additional mesoporous titania top layer following the contour of the macropores, of 100-200 nm thickness and with a pore diameter of 10nm, was formed by using the evaporation-induced self-assembly (EISA) method with titanium (IV) tetraethoxide as the precursor. A coherent laminar titania surface layer was thus obtained, creating a hierarchical macro- and mesoporous surface that was characterized by high-resolution electron microscopy. The interfacial bonding between the surface layers and the titanium matrix was characterized by the scratch test that con…

Pinares y enebrales. El paisaje solutrense en Iberia

2013

Se presentan estudios antracológicos de yacimientos de la península Ibérica con el objetivo de conocer la flora durante el Solutrense y, a partir de ella, las condiciones termoclimáticas y ombroclimáticas. Con los datos publicados e inéditos se demuestra que los refugios de las especies más cálidas están al sur del paralelo 40º N. La flora identificada en los carbones se puede agrupar en cuatro categorías: criófilas, termófilas, matorral y ribera. Se observa un gradiente latitudinal de la distribución de los marcadores más térmicos como Pinus pinea, Rosmarinus officinalis, mientras que los pinos criófilos están distribuido por todas las regiones. Se propone la identificación botánica de los…

ENHANCED BIOREMEDIATION E MONITORAGGIO MICROBIOLOGICO DI ACQUA CONTAMINATA DA SOLVENTI CLORURATI

2023

I solventi clorurati sono composti organici di sintesi appartenenti alla classe degli idrocarburi alifatici clorurati, largamente impiegati in diversi settori industriali e, come conseguenza, ampiamente diffusi nell’ambiente come inquinanti e particolarmente pericolosi anche per la salute umana. Tra i metodi di bonifica di siti contaminati da solventi clorurati, quelli basati sul biorisanamento sfruttano uno dei peculiari metabolismi batterici coinvolti nella biodegradazione di tali composti: la declorurazione riduttiva anaerobia in cui il composto clorurato è utilizzato come accettore terminale di elettroni in un vero e proprio processo di respirazione anaerobia, detta dealorespirazione; i…

Adversus rebelles. Forme di ribelione e di reazione romana nelle Spagne e in Asia minore al tempo di Marco Aurelio.

2009

L’AVVENIRE DEGLI SPAZI NATURALI PERIRUBANI: RIFLESSIONI A MARGINE DI UNA TAVOLA ROTONDA NEL GRAND PARC MIRIBEL JONAGE DI LIONE

2009

Characterizing a hybrid zone between a cryptic species pair of freshwater snails.

2015

Characterizing hybrid zones and their dynamics is a central goal in evolutionary biology, but this is particularly challenging for morphologically cryptic species. The lack of conspicuous divergence between parental types means intermediate hybrid forms often go undetected. We aimed to detect and characterize a suspected hybrid zone between a pair of morphologically cryptic lineages of the freshwater snail, Radix. We sampled Radix from across a contact zone between two mitochondrial lineages (Radix balthica and an undescribed lineage termed 'MOTU3') and detected admixture between two nuclear genotype clusters, which were significantly but not categorically associated with the mitochondrial …