1,721,731 research outputs found
A method for collecting large quantities of Cryptosporidium parasites
No full textThe intestinal mucoso may be regarded as a potential and abundant source of Cryptosporidium parvurn parasites from which all developmental stages might be collected. If intracellular stages could be recovered from the brush border, many of the limitations concerned with the use of oocysts and in vitro cultures may be overcome. Hans-Michael Muller, Lorella Ranucci, Edoordo Pozio and Andrea Crisanti discuss here how this can be done
Effect of Low Cobalt Loading on TiO2 Nanotube Arrays for Water-Splitting
Get PDFThis work is intended to define a new possible methodology for the TiO2 doping through the use of an electrochemical deposition of cobalt directly on the titanium nanotubes obtained by a previous galvanostatic anodization treatment in an ethylene glycol solution. This method does not seem to cause any influence on the nanotube structure, showing final products with news and interesting features with respect to the unmodified sample. Together with an unmodified photoconversion efficiency under UV light, the cobalt doped specimen reports an increase of the electrocatalytic efficiency for the oxygen evolution reaction (OER)
The Red fox (Vulpes vulpes L.), a reservoir of parasitic zoonoses in italy
No full textPozio Edoardo. The Red fox (Vulpes vulpes L.), a reservoir of parasitic zoonoses in italy. In: Revue d'Écologie (La Terre et La Vie), tome 40, n°2, 1985. p. 240
Titanium nanotubes activate genes related to bone formation in vitro
Get PDFBackground: Titanium is used worldwide to make osseointegrable devices, thanks to its favorable characteristics as mechanical proprieties and biocompatibility, demonstrated by in vivo studies with animal models and clinical trials over a forty-year period. However, the exact genetic effect of the titanium layer on cells is still not well characterized.
Materials and Methods: To investigate how titanium nanotubes stimulate osteoblasts differentiation and proliferation, some osteoblast genes (SP7, RUNX2, COL3A1, COL1A1, ALPL, SPP1 and FOSL1) were analyzed by quantitative Real Time RT- PCR.
Results: After 15 days, osteoblasts cultivated on titanium naotube showed the up-regulation of bone related genes SP7, ENG, FOSL1 and SPP1 and the down-regulation of RUNX2, COL3A1, COL1A1, and ALPL. After 30 days of treatment, the bone related genes SP7, ENG, FOSL1 and RUNX2 were up-regulated while COL3A1, COL1A1, ALPL and SPP1 were down-regulated.
Conclusions: Our results, demonstrates that titanium nanotubes can lead to osteoblast differentiation and extracellular matrix deposition and mineralization in dental pulp stem cells by the activation of osteoblast related genes SPP1, FOSL1 and RUNX2
TiO2 nanotubes photo-anode: An innovative cell design
No full textPhotocatalytic properties of titanium dioxide make it an extremely useful material in the field of renewable energy. Here we describe an electrochemical cell with an innovative design in which the anode consists of an array of highly ordered TiO2 nanotubes on porous nickel. Such a combination of materials renders this system able to work both in dark and under solar light exposure, thus opening new perspectives for industrial-scale applications
Palladium-based hollow cathode electrolysers for hydrogen production.
No full textAbstract : Ultra-pure hydrogen can be obtained through the use of water electrolysers with dense metal cathodes. In this chapter, the theory of hydrogen evolution over Pd-based cathodes and its permeation through dense metal walls is introduced, and the Damköhler − Peclet analysis for these membrane reactors is described. Optimization of the electrolysis
process is considered, based on the relationship of DaPe number with the cell overpotential and the apparent activation energy of permeation. Literature studies on hollow cathode water electrolysers are discussed, as are new prototypes using thin-wall Pd–Ag permeator tubes, and the efficient operation of cell effi ciency and surface activation/deactivation
phenomena. The main applications of cells with Pd-based hollow cathodes are the production of ultra-pure hydrogen at high pressure for small scale laboratory electrolysers and the treatment of tritiated water. The results of tests on prototypes are examined in detail, and attention is given to future trends in material development
Effect of Tantalum doping on TiO2 nanotube arrays for water-splitting
Get PDFThis work is intended to define a new possible methodology for TiO2 doping through the use of electrochemical deposition of tantalum directly on the titanium nanotubes obtained by a previous galvanostatic anodization treatment in an ethylene glycol solution. This method does not seem to cause any influence on the nanotube structure, showing final products with news and interesting features with respect to the unmodified sample. Together with a decrease in the band gap and flat band potential of the TiO2 nanotubes, the tantalum doped specimen reports an increase of the photo conversion efficiency under UV light
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