89 research outputs found
Final evidence for H termination of HF-treated Si surfaces: a comparative study by high-energy and vibrational spectroscopies
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Comparison of Bulk and Surface Structure in Hydrogenated Amorphous Carbon Films
No full textHydrogenated amorphous carbon (a-C:H) films having different characteristics (diamond like, graphite like and polymer like) are analysed. By comparing the results obtained with a surface-sensitive technique (high resolution electron energy loss spectroscopy) and a bulk-sensitive technique (IR spectrometry) knowledge of the hydrogen and sp3-sp2 depth distributions is achieved. For instance, it is shown that diamond-like films have a hydrogen enrichment near the surface, while the sp3 to sp2 ratio for protonated sites does not change with depth. By means of spectral ellipsometry, the real and imaginary parts of the dielectric constant are measured. Their shapes for the three types of a-C:H are discussed on the basis of the sp2 cluster model. For instance, it is shown that, in the bulk of graphite-like a-C:H, sp2 sites are grouped in a limited range of almost undistorted cluster sizes
Renal insufficiency, a frequent complication with age in oral-facial-digital syndrome type I.
No full textpeer reviewedSaal S, Faivre L, Aral B, Gigot N, Toutain A, Van Maldergem L, Destree A, Maystadt I, Cosyns J-P, Jouk P-S, Loeys B, Chauveau D, Bieth E, Layet V, Mathieu M, Lespinasse J, Teebi A, Franco B, Gautier E, Binquet C, Masurel-Paulet A, Mousson C, Gouyon J-B, Huet F, Thauvin-Robinet C. Renal insufficiency, a frequent complication with age in oral-facial-digital syndrome type I. The oral-facial-digital syndrome type I (OFD I) is characterized by multiple congenital malformations of the face, oral cavity and digits. A polycystic kidney disease (PKD) is found in about one-third of patients but long-term outcome and complications are not well described in the international literature. Renal findings have been retrospectively collected in a cohort of 34 females all carrying a pathogenic mutation in the OFD1 gene with ages ranging from 1 to 65 years. Twelve patients presented with PKD - 11/16 (69%) if only adults were considered -with a median age at diagnosis of 29 years [IQR (interquartile range) = (23.5-38)]. Among them, 10 also presented with renal impairment and 6 were grafted (median age = 38 years [IQR = (25-48)]. One grafted patient under immunosuppressive treatment died from a tumor originated from a native kidney. The probability to develop renal failure was estimated to be more than 50% after the age of 36 years. Besides, neither genotype-phenotype correlation nor clinical predictive association with renal failure could be evidenced. These data reveal an unsuspected high incidence rate of the renal impairment outcome in OFD I syndrome. A systematic ultrasound (US) and renal function follow-up is therefore highly recommended for all OFD I patients
Bulk and surface in a-C:H films
No full textBy using surface (High Resolution Electron Energy Loss Spectroscopy) and bulk (Infrared Spectrometry) sensitive
techniques, the lcnowledge of hydrogen and sp3hp2 depth profiles is achieved. It is shown that diamond-like films have a hydrogen enrichment near the surface, while their sp3/sp2 value does not change with depth. The shapes of the real and imaginary parts of the dielectric constant, obtained by means of Spectral Ellipsometry, are discussed based on the sp2 clusters model
Surface electronic structure of InAs(100)12/14-Pb
No full textUpon deposition and annealing of one Pb monolayer on the clean, In-terminatedInAs(100)-4x2/c(8x2) surface we have obtained a sharp1x2/1x4 superstructure. We have investigated its electronic structure by angle-resolved photoemission using synchrotron radiation. From valence-band spectra measured at normal emission as well as along the¯Γ-¯J and¯Γ-¯J′ directions of the surface Brillouin zone, two surface induced states were identified and mapped out
Ion energy distribution functions and Langmuir probe measurements in low pressure argon discharges
No full textErosion and redeposition measurement in tokamaks using temporal phase shifting speckle interferometry in presence of vibrations
No full textDispersion of the interband π electronic excitation of highly oriented pyrolytic graphite measured by high resolution electron energy loss spectroscopy
No full textGenomic deletions of OFD1 account for 23% of oral-facial-digital type 1 syndrome after negative DNA sequencing.
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