Oxidation of silicon nanoparticles produced by ns laser ablation in liquids

The investigation of nanoparticles produced by ns pulsed Nd:YAG laser ablation of silicon in liquids is reported. Combined characterization by morphological and structural techniques shows that these nanoparticles have a mean diameter of ~3 nm and a core-shell structure consisting of a Si-nanocrystal surrounded by a layer of oxidized Si. Time resolved luminescence spectra evidence visible and UV emissions: a broad band around 1.9 eV originates from Si-nanocrystals, while two bands centered at 2.7 eV and 4.4 eV are associated with oxygen deficient centers in the SiO2 shell.

L’eta’ e gli elevati livelli di proteina C-reattiva e fibrinogeno sono forti predittori di eventi clinici in una popolazione di donne con aterosclerosi carotidea.

Asymptomatic carotid lesions and aging: role of hypertension and other traditional and emerging risk factors

ASYMPTOMATIC CAROTID LESIONS AND AGING: ROLE OF HYPERTENSION AND OTHER TRADITIONAL AND EMERGING RISK FACTORS BACKGROUND: We evaluated the prevalence of intima-media thickening (IMT) and asymptomatic carotid plaque (ACP) in a group of subjects with or without traditional and/or emerging risk factors (RF). METHODS: There were 631 subjects (313 male and 318 female) aged between 19 and 97 years, asymptomatic for cerebro- and cardiovascular diseases. The following measurements were used: anamnesis, physical examination, height and sitting blood pressure. Biochemistry variables were also considered: total cholesterol, HDL-C, LDL-C, triglycerides, fibrinogen, high sensitive C-reactive protein, IgG…

Nano-Oxides produced by ns laser ablation in liquids

Laser ablation in liquids was successfully applied to produce nanosized oxides from Si, Ti and Zn targets. The obtained colloidal solutions of nanoparticles were investigated by complementary techniques: AFM, IR and Raman spectroscopies; optical absorption and time resolved photoluminescence. The results demonstrate the production of SiO2, TiO2 and ZnO. The absorption and emission properties of these material have been also investigated and appear to be promising for optical applications.

ASSOCIATION OF ELEVATED FIBRINOGEN AND C-REACTIVE PROTEIN LEVELS WITH CAROTID LESIONS IN PATIENTS WITH EARLY ONSET OF HYPERTENSION OR TYPE-II DIABETES

LA PRESENZA DI ELEVATI LIVELLI DI FIBRINOGENO E PROTEINA C-REATTIVA SONO SIGNIFICATIVAMENTE ASSOCIATI ALLA PRESENZA DI ATEROSCLEROSI CAROTIDEA NEI PAZIENTI IPERTESI O DIABETICI.