1,721,054 research outputs found
One-point AG codes on the GK maximal curves
No full textIn this paper, algebraic-geometric (AG) codes associated to a recently discovered class of maximal curves are investigated. As a result, some linear codes with better parameters with respect to the previously known ones are discovered, and 70 improvements on MinT's tables ("Tables of optimal parameters for linear codes,'' University of Salzburg, Salzburg, Austria) are obtained
BIOMECHANICAL CONSIDERATIONS ON MACROMORPHOLOGY OF ENDOSSEOUS DENTAL IMPLANTS
No full textThe aim of the present study is to define the optimal thread form and why the macroscopic shape of the dental intra-osseous implant interacts with the biological environment thus conditioning its lifespan and long-term success
Separazione enantiomerica di analoghi chirali dell'acido clofibrico mediante elettroforesi capillare
No full text
Desorption electrospray ionization mass spectrometry for food analysis
No full textDesorption electrospray ionization mass spectrometry (DESI-MS)has found applications in many fields. Unfortunately and despite many peculiarities, its use in food science is still in its infancy. This review focuses on both technical aspects and the different ways in which this interface has been exploited in food analysis. DESI signal's reliance on interface geometry, solvent composition, and analyte distribution is deeply evaluated and microscopic pictures of these phenomena are shown in order to provide a fundament to critically understand the overviewed works. Green aspects of the technique are also described, distinguishing between direct (no sample pretreatment)and indirect methods (minimal sample pretreatment). All papers published from the appearance of DESI interface on the market are examined. Authors' goal was to produce an organic and complete overview able to provide a clear critical opinion on the key issues, available methods and future developments in this field of study
Enantioseparazione di analoghi chirali dei fibrati in Elettroforesi Capillare e nano-Cromatografia Liquida
No full text
"High-performance ligand-exchange chromatography of amino acids on chiral stationary phases"
No full textThree chiral stationary phases, obtained by grafting silica gel with (-)-trans-1,2-cyclohexanediamine, were studied for the resolution of -amino acids by ligand-exchange chromatography. The packings were prepared by bonding the chiral ligand to silica gel via different hydrocarbon spacers. Separation of the optical isomers was accomplished by eluents containing a constant concentration of copper(II) acetate (0.05mM). The elution sequence of amino acids was found to be dependent on the grafting reaction selected to prepare the chiral packings
EFFECT OF DISTANCE BETWEEN ONE PIECE IMPLANTS ON CRESTAL BONE RESORPTION
No full textOne-piece implants became incorporate the trans-mucosal abutment facing the soft tissues as an integral part of the implant. The interface between the trans-mucosal component and the implant is generally located in the neighbourhood of the alveolar bone level. One-piece implant are usually welded together and immediately loaded. Since no report is available on the effect of distance between implants on clinical outcome, a retrospective study was performed.
Nineteen patients (10 females and 9 males) with a median age of 62 years (min-max 43-80) were enrolled. The mean follow-up was 7 months. A total of 176 one-piece implants (Diamond, BIOIMPLANT, Milan, Italy) were inserted. Among them 11 failed (i.e. survival rate – SVR = 93.75). The remaining 165 were studied as regard peri-implant bone resorption. Since 4 fixtures have a crestal bone resorption higher than 1.5 mm, the success rate (SCR) was 97.57. Log rank testing was used to compare success curves.
Statistical analysis demonstrated that an average distance between fixtures of about 2 mm does not determine an higher crestal bone resorption when one-piece implants are used.
In conclusion one-piece implants are reliable devices for oral rehabilitation and distance between fixtures of about 2 mm does not determine an higher crestal bone resorption
- …
