Structural Testing by Torsion of Scalable Wind Turbine Blades.

In life service, the wind turbine blades are subjected to compound loading: torsion, bending, and traction, all these resulting in the occurrence of normal and tangential stresses. At some points, the equivalent stresses, due to overlapping effects provided by normal and shear stresses, can have high values, close to those for which the structure can reach to the failure point. If the effects of erosion and clashes with foreign bodies are added, the structure of the blade may lose its integrity.

Hemin interaction with bare and 4,4'-thio-bis-benzene-thiolate covered n-GaAs (110) electrodes.

Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) investigations on the redox behavior of hemin at bare and 4,4'-thio-bis-benzene-thiolate (TBBT) covered n-GaAs (110) electrodes in dimethylsulfoxide (DMSO) revealed the high irreversibility of the electroreduction process, which appeared to be closely related to the stable adsorbed species strongly interfering with the electronic properties of the semiconducting substrate. The subsequent exploration of the hemin-modified electrodes by second harmonic generation (SHG), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) measurements pointed to significant differences between the iron protoporphyrin species adsorbed on the bare- and TBBT-GaAs (110) electrodes. Only Fe(2+) species having a flat configuration with the porphyrin plane oriented parallel to the surface were detected on GaAs, unlike the TBBT-GaAs, where Fe(2+) and Fe(3+) species having both flat and vertical adsorption positions could be observed.

[Myocardial injuries induced by oxidative stress in rat--experimental morphopathological study].

Unlabelled: Oxidative stress is a phenomenon significantly involved in several clinical conditions such as ischemic heart disease and myocardial reperfusion.

Purpose: Creating an animal model of oxidative stress based on three methods: exertional (swimming), habitual (light exposure), and corticotropine injections.

Material And Methods: 40 Wistar adult rats, weighting between 210-315 g, were subjected to either none (control group), swimming, light exposure or corticotropine injections for six weeks, then the animals were sacrificed and a light and electronic microscopic examination of the myocardium and ascending aorta were performed.

[Ki-67 and p53 expressions versus differentiation degrees of colon adenocarcinoma].

Purpose: The colon carcinoma prognostic is evaluated with respect to four categories of factors established by College of American Pathologists Consensus Statement 1999, among which a series of molecular markers is also included. Our study aimed to develop semiquantitative analysis of the immunohistochemistry pattern for proliferation and apoptosis markers, as well as of their connections with the histopathology subtypes of colon adenocarcinoma.

Material And Methods: The group of study included 5 cases of well-differentiated adenocarcinoma, 5 cases of moderately differentiated adenocarcinoma and 5 cases of poor differentiated adenocarcinoma.

Ki-67, p53 and bcl-2 analysis in colonic versus rectal adenocarcinoma.

This paper develops a comparative study between similar subtypes of colonic and rectal adenocarcinoma, based on their immunohistochemical profiles for Ki-67, p53 and bcl-2 markers, in order to evaluate the prediction value for the investigated markers, according to the histologic subtype and location. Thirty cases of adenocarcinoma were investigated, 15 with colonic and 15 with rectal location. For both locations, the cases included five well-differentiated, five moderately differentiated and five low differentiated subtypes.