(C) 2011 American Institute of Physics. [doi: 10.1063/1.3585860]“
“This work aimed to compare the allocation of Al, Fe, Cu, Ni, amino acids and sugars in different fractions of root

cells of Paspalum notatum with 21 and 120 days old grown in quartz sand. In general younger roots showed a higher find more content of Al, Fe, Cu Ni, amino acids and sugars, compared to older roots. This can be due to a higher metabolic activity of younger roots and/or to structural changes that can occur with cell ageing. Al and Fe were mainly allocated to fractions with pectin, hemicellulose and cellulose, both in younger and older roots. However, older roots also showed a significant fraction of Al allocated to the intracellular fraction. It seems that older roots were less able to prevent the entry of Al in the cytoplasm. The proportion of Cu was higher in intracellular components, both in younger and older roots, as expected from an essential nutrient. Ni content was very low in older roots and

in younger roots it was mainly allocated to the intracellular fraction and to the cell wall polysaccharides fraction. The amino acids were mainly allocated to the cytoplasm and polysaccharide fraction. Although younger roots showed a higher Selleck Fludarabine total amount of amino acids compared to older roots, the amino acids profile and allocation, mainly Gamma-secretase inhibitor in the cytoplasm polysaccharides, was quite similar. Arabinose, a major component of structural glycoproteins of the primary cell wall matrix, was only detected in younger roots. Thus, it seems that root cells of P notatum suffered changes in the composition of the cell wall components with ageing. To further understand

the structural changes of root cells with ageing and its effect on metal allocation, it is important to quantify several components of the cell wall matrix, namely pectins and glycoproteins. (C) 2011 Elsevier Masson SAS. All rights reserved.”
“In 538 febrile episodes in 188 children enrolled prospectively, 62% of children were neutropenic and 86% had infection-related fever. Respiratory infection was the commonest febrile cause (60%). Bacteremia occurred more often in neutropenic than non-neutropenic episodes (20% vs. 3%) and was accompanied significantly more with shiver, lassitude, and decreased dorsum pedis pulse. About 65% of blood isolates were Gram-negative bacilli, which differs from the observations in western countries.”
“In this study, we have investigated the influence of an external electric field on the electronic properties of the ground and excited states and studied the linear and the third-order nonlinear optical properties (i.e., absorption coefficients and refractive indices) in a spherical semiconductor quantum dot of a parabolic confinement with an on-center shallow hydrogenic impurity.