1,722,616 research outputs found
Pathogenesis of posterior capsular opacification. Part I. Epidemiological and clinico-statistical data
No full textWe examined 895 eves having extracapsular cataract surgery; 403 had an intraocular lens (IOL) implanted and 492 did not. The incidence of posterior capsular opacification was 7.69% in the eyes with an IOL and 14.23% in the eyes without an IOL. If we exclude complicated cataracts from the cases that did not have an IOL, the incidence of posterior capsular opacification decreases to 9.06%. Various models of implanted IOLs showed different incidences of posterior capsular opacification: For J-looped lenses the incidence was 11.02%; for Frezzotti-Caporossi lenses, 7.35%. The follow-up Nvas too short for soft lenses. The Frezzotti-Caporossi lens can he inserted with the convex side either anterior or posterior. A statistical evaluation shows that the reverse optic or posterior convex orientation in the bag caused a lower incidence of posterior capsular opacification (3.01%). © 1990, American Society of Cataract and Refractive Surgery. All rights reserved
Snow Accumulation in the Talos Dome Area: Preliminary Results
No full textIce divide-dome migration is a key parameter in mass balance studies and in the interpretation of ice cores. The stability of the dome and position of the ice divide must be known to accurately interpret ice core records and to complete mass balance studies. Models of depth-age relationships for deep ice cores are sensitive to migration of the dome position (Anandakrishnan et al., 1994). The evolution of an ice divide is driven by the accumulation-rate history, its spatial pattern and conditions at ice-sheet boundaries (e.g. Frezzotti et al., 2004; Hindmarsh, 1996; Nereson et al., 1998). Ice divide migration is also important in determining the input parameter of large Antarctic drainage basins. Due to the very low slope (less than a decimetre per km) of East Antarctic domes and to surface morphology (e.g. sastrugi), it is very difficult to determine the summit point of a dome and its migration in time. In 2004 a new ice coring project, TALDICE (Talos Dome Ice
Core Project), started at TD to recover 1550 m of ice spanning the last 120 000 years (Frezzotti et al., 2004). This paper discusses preliminary findings on the present and past morphology of Talos Dome based on detailed snow accumulation data, radar-derived isochrons and ice velocity measurements in the last 10 years.Published51-543.8. Geofisica per l'ambienteN/A or not JCRope
TALOS DOME MIGRATION : PRELIMINARY RESULT
No full textIce divide-dome migration is a key parameter in mass balance studies and in the interpretation of ice cores. The stability of the dome and position of the ice divide must be known to accurately interpret ice core records and to complete mass balance studies. Models of depth-age relations for deep ice cores are sensitive to migration of the dome position (Anandakrishnan et al., 1994). The evolution of an ice divide is driven by the accumulation-rate history, its spatial pattern and conditions at ice-sheet boundaries (e.g. Frezzotti et al., 2004; Hindmarsh, 1996; Nereson et al. 1998). Ice divide migration is also important in determining the input parameter of large Antarctic drainage basins. Due to the very low slope (less than a decimetre per km) of the East Antarctic domes and to the surface morphology (e.g. sastrugi), it is very difficult to determine the summit point of the dome and its migration in time. In 2004 a new ice coring project, TALDICE (Talos Dome Ice Core Project), started at TD to recover 1550 m of ice spanning the last 120,000 years (Frezzotti et al., 2004).
The objective of the paper is to discuss the preliminary result of the present and past morphology of the Talos Dome from detailed snow accumulation, radar derived isochrons and ice velocity measurements in the last 10 years
Miscellaneous -- 1959-62 -- Correspondence, Toxoplasmosis -- letter, 1962-06-07
No full textLetter from Frezzotti, Renato to Sabin, Albert B. dated 1962-06-07.Sabin Collection Fair Use Policy</a
Italie
No full textPingeot Anne, Frezzotti Stefania. Italie. In: Revue de l'Art, 1994, n°104. pp. 80-82
Primary open angle glaucoma in a case of Mitochondrial Encephalomyopathy (Kearns- Sayre Syndrome)
No full textPURPOSE:
Kearns-Sayre syndrome is characterized by chronic progressive external ophthalmoplegia, tapetoretinal degeneration and severe generalized myopathy.
METHODS AND RESULTS:
We report on a 82-year-old male patient with Kearns-Sayre syndrome with open angle glaucoma.
DISCUSSION:
Reports of primary open angle glaucoma with Kearns-Sayre syndrome are very rare, but it is difficult to believe that this association is merely coincidental
Accumulation patterns around Dome C, East Antarctica, in the last 73 kyr
No full textWe reconstruct the pattern of surface accumulation in the region around Dome C, East Antarctica, since the last glacial. We use a set of 18 isochrones spanning all observable depths of the ice column, interpreted from various ice-penetrating radar surveys and a 1-D ice flow model to invert for accumulation rates in the region. The shallowest four isochrones are then used to calculate paleoaccumulation rates between isochrone pairs using a 1-D assumption where horizontal advection is negligible in the time interval of each layer. We observe that the large-scale (100sĝ€km) surface accumulation gradient is spatially stable through the last 73ĝ€kyr, which reflects current modeled and observed precipitation gradients in the region. We also observe small-scale (10ĝ€sĝ€km) accumulation variations linked to snow redistribution at the surface, due to changes in its slope and curvature in the prevailing wind direction that remain spatially stationary since the last glacial. © Author(s) 2018
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