ORIGIN OF LIGHT SCATTERING FROM DISORDERED SYSTEMS

Anelastic light scattering is computed numerically for model disordered systems (linear chains and 2-dimensional site and bond percolators), with and without electrical disorder. A detailed analysis of the vibrational modes and of their Raman activity evidences that two extreme mechanisms for scattering may be singled out. One of these resembles scattering from finite size systems, while the other mechanisms originates from spatial fluctuations of the polarizability and is such that modes in even small frequency intervals may have very different Raman activities. As a consequence, the average coupling coefficient $C(\omega)$ is the variance of a zero-average quantity. Our analysis shows that for both linear chains and 2-dimensional percolators the second mechanism dominates over the first, and therefore Raman scattering from disordered systems is essentially due to spatial fluctuations.Comment: 12 pages, Latex, 7 figures available on request

Aceitabilidade de extratos de soja obtidos a partir de 13 cultivares desenvolvidas pela embrapa soja.

O extrato de soja está presente em grande parte das bebidas à base de soja, cujo mercado vem crescendo a taxas elevadas em todo o mundo, devido a características de conveniência (pronto para beber), saudabilidade (sem lactose e gorduras saturadas) e diversificação (multiplicidade de sabores) do produto. Os fabricantes de extrato de soja necessitam de cultivares cujos grãos resultem em bebidas de boa aceitação sensorial. Neste trabalho, 13 cultivares desenvolvidas pela Embrapa Soja foram avaliadas quanto à aceitação sensorial de seus extratos, por meio de uma equipe de 60 consumidores. As cultivares BRS 212, 215, 230 e 231, seja por sua nota média de aceitação e/ou por preferência, distinguiram se das demais cultivares testadas em relação ao potencial para a produção de extrato de soja. Assim, constituem-se em boas opções de matéria prima para os fabricantes de extrato, podendo atender diferentes segmentos de consumidores

A shear cell study on oral and inhalation grade lactose powders

Abstract Shear cell tests have been conducted on twenty different lactose powders, most of which commercially available for oral or inhalation purposes, spanning a wide range of particle sizes, particle morphologies, production processes. The aims of the investigation were: i) to verify the reliability of the technique in evaluating and classifying the flowability of powders; ii) to understand the connection between the flowability of a powder and the morphological properties of its particles; iii) to find a general mathematical relationship able to predict the yield locus shape given the particle size, shape and consolidation state of a lactose powder. These aspects and their limitations are detailed in the manuscript together with other interesting findings on the stick-slip behavior observed in most of the lactose powders examined

USP2a alters chemotherapeutic response by modulating redox

Cancer cells are characterized by altered ubiquitination of many proteins. The ubiquitin-specific protease 2a (USP2a) is a deubiquitinating enzyme overexpressed in prostate adenocarcinomas, where it exhibits oncogenic behavior in a variety of ways including targeting c-Myc via the miR-34b/c cluster. Here we demonstrate that USP2a induces drug resistance in both immortalized and transformed prostate cells. Specifically, it confers resistance to typically pro-oxidant agents, such as cisplatin (CDDP) and doxorubicin (Doxo), and to taxanes. USP2a overexpression protects from drug-induced oxidative stress by reducing reactive oxygen species (ROS) production and stabilizing the mitochondrial membrane potential (ΔΨ), thus impairing downstream p38 activation and triggering of apoptosis. The molecular mediator of the USP2a protective function is the glutathione (GSH). Through miR-34b/c-driven c-Myc regulation, USP2a increases intracellular GSH content, thus interfering with the oxidative cascade triggered by chemotherapeutic agents. In light of these findings, targeting Myc and/or miR-34b/c might revert chemo-resistance

A soja no dia-a-dia: um brinde à sua vida.

Receitas básicas; "leite" de soja; Farinha de soja; Hidratação da Proteína Texturizada de Soja - PTS; Receitas salgadas: Biscoito salgado; Torta salgada; Quibe assado; "Queijo" de soja; Massa para pizza; Pizza de liquidificador; Macarrão caseiro; Nhoque; Massa folhada; Receitas doces: Donuts; Mini sonhos; Bolinhos fritos; Bolo de limão; Bolo de soja e aveia; Bolo de chocolate; Sequilhos de coco; Rosca flor; Pão doce; Pãezinhos de maçã; Pão de mel.bitstream/item/57803/1/Documentos-200.pd

Hypofractionated stereotactic radiotherapy in combination with whole brain radiotherapy for brain metastases

Background The efficacy and toxicity of hypofractionated stereotactic radiotherapy (HSRT) in combination with whole brain radiotherapy (WBRT), for the treatment of 1-4 brain metastases, using a non invasive fixation of the skull, was investigated. Methods Between 04/2001 and 01/2006 30 patients with 44 brain metastases underwent irradiation. Every patient received WBRT (10 x 3 Gy); 41/44 lesions received HSRT boost with a median dose fraction of 6 Gy, the fractionation schemes were 3 x 6 Gy and 4 x 8 Gy; a median total dose of 18 Gy was delivered to the tumor isocenter. Results The median survival period was 9.15 months, the actuarial 1-year overall survival and freedom from new brain metastases were 36.6% and 87.9%, respectively; at univariate analysis Karnofsky Performance Status (KPS) was statistically significant (P = 0.05); the actuarial 1-year local control for the 41/44 lesions was 86.1%. No patient had acute or late complications. Conclusions HSRT as a concomitant boost during WBRT is a safe and well tolerated treatment for selected patients with brain metastases

Barkhausen instabilities from labyrinthine magnetic domains

Experimental investigations of the scaling behavior of Barkhausen avalanches in out-of-plane ferromagnetic films yield widely different results for the values of the critical exponents despite similar labyrinthine domain structures, suggesting that universality may not hold for this class of materials. Analyzing a phase field model for magnetic reversal, we show that avalanche scaling is bounded by characteristic lengthscales arising from the competition between dipolar forces and exchange interactions. We compare our results with the experiments and find a good qualitative and quantitative agreement, reconciling apparent contradictions. Finally, we make some prediction, amenable to experimental verification, on the dependence of the avalanches behavior from the film thickness and disorder