Search results for "31"

Immunohistochemical Localization of Epithelial, Endothelial and Muscular Cell Differentiation Markers in Human Umbilical Cord

2008

Introduction. Since time [1], our group studies through immunohistochemistry and RT-PCR analysis the expression of many genes and the localization of the corresponding proteins in the human umbilical cord [2], with the aim to create a map of the presence of the different molecules in the different territories of this organ. In this work we investigate the expression and localization of several cell differentiation markers in the different territories of the human umbilical cord. Materials and methods. The presence of E-Cadherin, CD31, CD68, AE1-AE3, Desmin, Actin ML, HHF35 and MIB-1 was studied through immunohistochemistry. Results. The expression of E-Cadherin (epithelial cell marker) has …

Role of CD1A and HSP60 in the antitumoral response of oesophageal cancer

2011

Oesophageal cancer (OC) is one of the most common and severe forms of tumor. A wider knowledge of molecular mechanisms which lead to a normal epithelium becoming a neoplasm may reveal new strategies to improve treatment and outcome of this disease. In this review, we report recent findings concerning molecular events which take place during carcinogenesis of the oesophagus. In particular, we focus on the role of two molecules, CD1a and Hsp60, which are overexpressed in oesophageal and many other types of tumor. Both molecules may present tumor antigens and promote in situ the stimulation of an antitumoral immune activity. We suggest there is a synergistic action between these molecules. Fur…

Variable Friction Dampers (VFD) for a modulated mitigation of the seismic response of framed structures: Characteristics and design criteria

2022

In this paper a new approach for the energy dissipation is discussed based on the use of Variable Friction Dampers (VFDs). The VFD device is borrowed from braking systems mechanical engineering, able to modulate its capability of dissipation, providing a constant pure friction force coupled with an additional (variable) damping force with the increasing of the displacement. Resorting to a previous study, the characteristics and the efficiency of the “braking” system in terms of reduction of the displacements and the restoring forces is described for SDOF systems under seismic excitations and compared with the performances achievable by classic constant friction dampers (CFDs). Then, a desig…

METODO PER IL TRATTAMENTO SUPERFICIALE DI LEGHE DI MAGNESIO PER APPLICAZIONI BIOMEDICALI

2019

L’invenzione oggetto di questo brevetto riguarda il processo di anodizzazione per la produzione di rivestimenti (coatings) su leghe di Magnesio AZ31. Queste leghe sono potenzialmente utilizzabili per la produzione di dispositivi biomedicali quali protesi e stent che sono soggetti a fenomeni di corrosione all’interno del corpo umano che ne possono compromettere il funzionamento. Il vantaggio di queste leghe sta nel fatto che possiedono ottime proprietà meccaniche (il modulo elastico delle leghe di Magnesio AZ31 risulta essere confrontabile con quello dell’osso umano) e risultano biodegradabili, ovvero svolgono la loro funzione di sostegno meccanico per lo stretto periodo necessario, e quindi…

Brushite/Hydroxyapatite Coatings obtained by galvanic deposition on 316L Stainless Steel

2016

Hydroxyapatite (HA, Ca10(PO4)6(OH)2) is a basic calcium phosphate mineral with chemical composition similar to that of bones and teeth. Owing to this peculiarity HA is a biocompatible material of high medical interest. Unfortunately, it possesses poor mechanical properties, because is brittle, has a low fracture resistance and a poor wear resistance. For these reasons, in the last years the research was been focused on the use of HA as a coating of another biomaterial that acts as support. The best choice is that to use a substrate that must be bionert and mechanically stable, such as 316L stainless steel (316LSS). This is useful for biomedical implants, because of its excellent biocompatib…

Photoelectrochemical monitoring of rouging and de-rouging process on AISI 316L for chemical reactors

2016

The food and fine-chemical industry has for a long time been troubled by red brown to dark violet deposits in distillation columns, storage vessels and distribution systems for purified water and clean steam. Owing to the visual appearance of those deposits, the phenomena was referred as rouge. Although formation of rouge, i.e. rouging, is a commonly known phenomenon in stainless steel systems, the basic mechanism is still not fully understood. The phenomenon causes precipitation of iron as fine red-brown ferric oxide or hydroxide particles. Moreover adherent discoloration of the stainless steel surface is often observed in conjunction with the loosely adhered rouge particles. The affected …

Photoelectrochemical Characterization of Oxide Layers on 316L Stainless Steel Grown in High temperature Water

2014

Photoelectrochemical and XPS Characterization of Passive films Grown on 316L Stainless Steel in High Temperature Water

2015

One of the major materials challenge for continued safe, reliable and cost-effective utilization of watercooled nuclear reactors for electricity production is development of improved understanding of the synergistic fundamental mechanisms responsible for corrosion and stress corrosion cracking degradation of austenitic steels and nickel base alloys

Galvanic Deposition of Calcium Phosphate/Bioglass Composite Coating on AISI 316L

2023

Calcium phosphate/Bioglass composite coatings on AISI 316L were investigated with regard to their potential role as a beneficial coating for orthopedic implants. These coatings were realized by the galvanic co-deposition of calcium phosphate compounds and Bioglass particles. A different amount of Bioglass 45S5 was used to study its effect on the performance of the composite coatings. The morphology and chemical composition of the coatings were investigated before and after their aging in simulated body fluid. The coatings uniformly covered the AISI 316L substrate and consisted of a brushite and hydroxyapatite mixture. Both phases were detected using X-ray diffraction and Raman spectroscopy.…

Some Numerical Remarks on a Meshless Approximation Method

2016

In this paper we consider sources of enhancement for the Smoothed Particle Hydrodynamics method in approximating a function and its derivatives. It is well known that the standard formulation is usually poor when scattered data distribution is considered or when the approximation near the boundary occurs. In this paper studies on the accuracy are provided and assessed with gridded and scattered data distribution in the problem domain. The improvements of the method are addressed and supporting numerical experiments are included.