Pseudo-static pile load test: expirience on pre-bored and large diameter piles

Pseudostatic load test is usually employed as an alternative to the conventional static load test for piles. Recent developments showed that the well developed Statnamic tests can be substantially simplified by using a hanging weight falling over a cushion system that allows increasing the time length of the generated stress pulse. This work describes the design of the test method and a recently experience related to the application of the pseudostatic load test used to evaluate the bearing capacity of large diameter piles. The performed test showed that using moderate loads from 10 to 20 tons falling from 10 cm to 120 cm and cushions prepared at varied stiffness allowed to reach more than 800 tons of loading and the fully mobilization of the pile ultimate capacity. The main advantages of the proposed pseudostatic tests respect to the conventional Statnamic tests is the possibility to apply load increments by steps, the repeatability of each loading step and the simpler test setup required by the former.Fil: Rinaldi, V. A. Universidad Nacional de Córdoba; Argentina.Fil: Viguera, R. CIM SRL consultants; Argentina.Ingeniería de la Construcció

Desvío de pilotes cortos durante el proceso de hinca; Evaluación de posibles causas

Fil: Rinaldi V. A. Universidad Nacional de Córdoba; Argentina.Fil: Viguera R. Consultora de Ingeniería Mediterránea CIM SRL; Argentina.El propósito de este trabajo es describir las dificultades encontradas durante la hinca de pilotes cortos donde se observaron las inclinaciones de los fustes. Esta situación tuvo lugar incluso con el uso de varios tipos de equipos de hinca y energía de martillos. El perfil del suelo muestra una capa superior muy compresible de menos de 4 m que sobreyace la Formación Pampeana altamente preconsolidadas, donde se obtiene el rechazo. El estudio analiza diferentes causas probables como origen potencial de las desviaciones observadas. Los diversos análisis realizados muestran que la inclinación de las pilas se debe a una combinación de factores geotécnicos que son objeto de evaluación y discusión de este trabajo, siendo la heterogeneidad de la formación Pampeano la causa principal más probable. Con el fin de materializar la fundación, se utilizó una pre-perforación a fin de orientar verticalmente los pilotes con la premisa de mantener la capacidad de carga del pilote.Fil: Rinaldi V. A. Universidad Nacional de Córdoba; Argentina.Fil: Viguera R. Consultora de Ingeniería Mediterránea CIM SRL; Argentina.Ingeniería de la Construcció

Tomografía sísmica aplicada a la ingeniería

Fil: Rinaldi V. A. Universidad Nacional de Córdoba; Argentina.Fil: Viguera R. Consultora de Ingeniería Mediterránea, CIM SRL; Argentina.Fil: Homenuc E. Consultora de Ingeniería Mediterránea, CIM SRL; Argentina.La técnica de sísmica de refracción es una herramienta geofísica fundamental en el estudio geotécnico de obras civiles, tanto para el mapeo de las distintas formaciones del subsuelo como para la detección del techo de roca. Por otro lado, la velocidad de propagación de ondas es un parámetro correlacionable directamente con importantes propiedades geotécnicas de los suelos y rocas. Actualmente la evolución de la técnica de medición y procesamiento de los datos, permite la obtención de imágenes tomográfícas, que incrementan su potencial para el uso en ingeniería geotécnica. En este trabajo se describe los principios básicos de la tomografía sísmica y se presenta un caso histórico de aplicación de esta técnica al estudio geotécnico para la caracterización y mapeo del techo de roca. En todos los casos se obtuvo una excelente correlación entre el perfil sísmico y el perfil geológico encontrado durante las prospecciones directas.Fil: Rinaldi V. A. Universidad Nacional de Córdoba; Argentina.Fil: Viguera R. Consultora de Ingeniería Mediterránea, CIM SRL; Argentina.Fil: Homenuc E. Consultora de Ingeniería Mediterránea, CIM SRL; Argentina.Ingeniería de la Construcció

Sequencing of folding events in Go-like proteins

We have studied folding mechanisms of three small globular proteins: crambin (CRN), chymotrypsin inhibitor 2 (CI2) and the fyn Src Homology 3 domain (SH3) which are modelled by a Go-like Hamiltonian with the Lennard-Jones interactions. It is shown that folding is dominated by a well-defined sequencing of events as determined by establishment of particular contacts. The order of events depends primarily on the geometry of the native state. Variations in temperature, coupling strengths and viscosity affect the sequencing scenarios to a rather small extent. The sequencing is strongly correlated with the distance of the contacting aminoacids along the sequence. Thus $\alpha$-helices get established first. Crambin is found to behave like a single-route folder, whereas in CI2 and SH3 the folding trajectories are more diversified. The folding scenarios for CI2 and SH3 are consistent with experimental studies of their transition states.Comment: REVTeX, 12 pages, 11 EPS figures, J. Chem. Phys (in press

Nuclear localization of the CK2a-subunit correlates with poor prognosis in clear cell renal cell carcinoma

Protein kinase CK2a, one of the two catalytic isoforms of the protein kinase CK2 has been shown to contribute to tumor development, tumor proliferation and suppression of apoptosis in various malignancies. We conducted this study to investigate CK2 expression in different subtypes of Renal Cell Carcinoma (RCC) and in the benign oncocytoma. qRT-PCR, immunohistochemistry and Western blot analyses revealed that CK2a expression was significantly increased at the mRNA and protein levels in clear cell RCC (ccRCC). Also the kinase activity of CK2 was significantly increased in ccRCC compared to normal renal cortex. Nuclear protein expression of CK2a correlated in univariate analysis with poor Progression Free Survival (HR = 8.11, p = 0.016). Functional analyses (cell proliferation assay) revealed an inhibitory effect of Caki-2 cell growth following CK2 inhibition with CX-4945. Our results suggest that CK2a promotes migration and invasion of ccRCC and therefore could serve as a novel prognostic biomarker and molecular therapeutic target in this type of cancer

Study of the shelf-life of phenolic compounds in winery by- products

[SPA] Los subproductos generados en la elaboración del vino constituyen un problema medioambiental y de gestión para las empresas. Este trabajo busca conseguir las condiciones idóneas, para conservar los compuestos bioactivos de dichos subproductos, con el fin de convertirlos en ingredientes funcionales. Así, se ha conseguido preservar el perfil fitoquímico de los subproductos, en estas matrices desecadas, conservando los compuestos (poli)fenólicos totales en un porcentaje aproximado del 79% en raspón, 83% en lías y 94% en bagazo tras 12 meses de almacenamiento. De este modo, los subproductos estabilizados se podrían emplear como fuente de compuestos fitoquímicos a lo largo de una anualidad. [ENG] The by-products generated in winemaking constitute an environmental problem, as well as a management problem for companies. This work seeks to achieve the ideal conditions to preserve the bioactive compounds of these by-products in order to convert them into functional ingredients. Thus, it has been possible to preserve the phytochemical profile of the by-products in these dried matrices, conserving the total (poly)phenolic compounds in an approximate percentage of 79% in the stalks, 83% in the lees and 94% in the grape pomace after 12 months storage. Thereby, the by-products stabilized could be used as sources of phytochemical compounds throughout an annuity.Ministerio de Ciencia e Innovación de España, proyecto CDTI (IDI-20200720)- Diseño y aplicación de un método de procesado a partir de residuo de vinificación generando un intermedio con propiedades funcionales para el sector nutracéutico y cosmético

Conformations of Proteins in Equilibrium

We introduce a simple theoretical approach for an equilibrium study of proteins with known native state structures. We test our approach with results on well-studied globular proteins, Chymotrypsin Inhibitor (2ci2), Barnase and the alpha spectrin SH3 domain and present evidence for a hierarchical onset of order on lowering the temperature with significant organization at the local level even at high temperatures. A further application to the folding process of HIV-1 protease shows that the model can be reliably used to identify key folding sites that are responsible for the development of drug resistance .Comment: 6 pages, 3 eps figure

Sphingosine induces the aggregation of imine-containing peroxidized vesicles

AbstractLipid peroxidation plays a central role in the pathogenesis of many diseases like atherosclerosis and multiple sclerosis. We have analyzed the interaction of sphingosine with peroxidized bilayers in model membranes. Cu2+ induced peroxidation was checked following UV absorbance at 245nm, and also using the novel Avanti snoopers®. Mass spectrometry confirms the oxidation of phospholipid unsaturated chains. Our results show that sphingosine causes aggregation of Cu2+-peroxidized vesicles. We observed that aggregation is facilitated by the presence of negatively-charged phospholipids in the membrane, and inhibited by anti-oxidants e.g. BHT. Interestingly, long-chain alkylamines (C18, C16) but not their short-chain analogues (C10, C6, C1) can substitute sphingosine as promoters of vesicle aggregation. Furthermore, sphinganine but not sphingosine-1-phosphate can mimic this effect. Formation of imines in the membrane upon peroxidation was detected by 1H-NMR and it appeared to be necessary for the aggregation effect. 31P-NMR spectroscopy reveals that sphingosine facilitates formation of non-lamellar phase in parallel with vesicle aggregation. The data might suggest a role for sphingosine in the pathogenesis of atherosclerosis

SK channels contribution to ventricular electrophysiology in heart failure patients

Heart failure (HF) is characterized by deterioration of the electrical and contractile function of the heart due to structural and functional remodelling, leading to development of arrhythmias and increased sudden cardiac death risk. SK channels are a type of calcium-activated potassium channels that do not play a relevant role in normal ventricular electrophysiology. However, it has been hypothesized that these channels become more relevant in pathologies such as HF. Nontheless, their role in human ventricular electrophysiology is not fully characterized