Implementação do algoritmo em Matlab® do método de diagonalização filtrada para análises de sinais de ressonância magnética nuclear.

No título, em Matlab® o símbolo é sobrescrito

Comportamento de híbridos de sorgo granífero cultivados na segunda safra no município de SINOP-MT.

O sorgo é uma gramínea de clima tropical de dias curtos, metabolismo C4, com eficiente mecanismo morfofisiológico, possuindo características de resistência ao déficit hídrico e habilidade de se manter dormente no período de seca (SANTOS, 2003; MAGALHAES; DURÃES, 2003). Tais características fazem com que esta cultura seja opção para cultivo em segunda safra, principalmente em períodos e regiões cujo cultivo de milho seja de risco pela possibilidade de restrições hídricas para fechamento do ciclo da planta. O levantamento da área plantada com sorgo na Safra 2013/14 é de 731 mil ha com produtividade de grãos de 2.587 kg ha-1 (CONAB, 2015). Maiores produtividades são alcançadas em lavouras que, seguindo planejamento adequado de plantio, utilizam sementes de cultivares recomendados para sua região de plantio. O melhoramento genético de plantas desenvolve variedades adaptadas a diferentes regiões e condições de cultivo, tornando importante que o produtor identifique aquelas que melhor se modele a sua realidade. Para tal, estudos de comportamento produtivo de genótipos no intuito de seleção daqueles com maior potencial produtivo e retorno econômico são recomendados antes do plantio de grandes áreas. Neste intuito, o presente trabalho avaliou o comportamento produtivo de híbridos de sorgo granífero cultivados em segunda safra, no município de Sinop, região norte de Mato Grosso.Editado por Aisy B. Baldoni, Fabiana A. de Rezende, José Ângelo N. de Menezes Júnior, Luciano B. Lopes, Sílvia de C. C. Botelho

"Delirium Day": A nationwide point prevalence study of delirium in older hospitalized patients using an easy standardized diagnostic tool

Background: To date, delirium prevalence in adult acute hospital populations has been estimated generally from pooled findings of single-center studies and/or among specific patient populations. Furthermore, the number of participants in these studies has not exceeded a few hundred. To overcome these limitations, we have determined, in a multicenter study, the prevalence of delirium over a single day among a large population of patients admitted to acute and rehabilitation hospital wards in Italy. Methods: This is a point prevalence study (called "Delirium Day") including 1867 older patients (aged 65 years or more) across 108 acute and 12 rehabilitation wards in Italian hospitals. Delirium was assessed on the same day in all patients using the 4AT, a validated and briefly administered tool which does not require training. We also collected data regarding motoric subtypes of delirium, functional and nutritional status, dementia, comorbidity, medications, feeding tubes, peripheral venous and urinary catheters, and physical restraints. Results: The mean sample age was 82.0 \ub1 7.5 years (58 % female). Overall, 429 patients (22.9 %) had delirium. Hypoactive was the commonest subtype (132/344 patients, 38.5 %), followed by mixed, hyperactive, and nonmotoric delirium. The prevalence was highest in Neurology (28.5 %) and Geriatrics (24.7 %), lowest in Rehabilitation (14.0 %), and intermediate in Orthopedic (20.6 %) and Internal Medicine wards (21.4 %). In a multivariable logistic regression, age (odds ratio [OR] 1.03, 95 % confidence interval [CI] 1.01-1.05), Activities of Daily Living dependence (OR 1.19, 95 % CI 1.12-1.27), dementia (OR 3.25, 95 % CI 2.41-4.38), malnutrition (OR 2.01, 95 % CI 1.29-3.14), and use of antipsychotics (OR 2.03, 95 % CI 1.45-2.82), feeding tubes (OR 2.51, 95 % CI 1.11-5.66), peripheral venous catheters (OR 1.41, 95 % CI 1.06-1.87), urinary catheters (OR 1.73, 95 % CI 1.30-2.29), and physical restraints (OR 1.84, 95 % CI 1.40-2.40) were associated with delirium. Admission to Neurology wards was also associated with delirium (OR 2.00, 95 % CI 1.29-3.14), while admission to other settings was not. Conclusions: Delirium occurred in more than one out of five patients in acute and rehabilitation hospital wards. Prevalence was highest in Neurology and lowest in Rehabilitation divisions. The "Delirium Day" project might become a useful method to assess delirium across hospital settings and a benchmarking platform for future surveys

Power estimation for non-standardized multisite studies

AbstractA concern for researchers planning multisite studies is that scanner and T1-weighted sequence-related biases on regional volumes could overshadow true effects, especially for studies with a heterogeneous set of scanners and sequences. Current approaches attempt to harmonize data by standardizing hardware, pulse sequences, and protocols, or by calibrating across sites using phantom-based corrections to ensure the same raw image intensities. We propose to avoid harmonization and phantom-based correction entirely. We hypothesized that the bias of estimated regional volumes is scaled between sites due to the contrast and gradient distortion differences between scanners and sequences. Given this assumption, we provide a new statistical framework and derive a power equation to define inclusion criteria for a set of sites based on the variability of their scaling factors. We estimated the scaling factors of 20 scanners with heterogeneous hardware and sequence parameters by scanning a single set of 12 subjects at sites across the United States and Europe. Regional volumes and their scaling factors were estimated for each site using Freesurfer's segmentation algorithm and ordinary least squares, respectively. The scaling factors were validated by comparing the theoretical and simulated power curves, performing a leave-one-out calibration of regional volumes, and evaluating the absolute agreement of all regional volumes between sites before and after calibration. Using our derived power equation, we were able to define the conditions under which harmonization is not necessary to achieve 80% power. This approach can inform choice of processing pipelines and outcome metrics for multisite studies based on scaling factor variability across sites, enabling collaboration between clinical and research institutions

Determinazioni analitiche di plutonio-239 in campioni biologici

A rapid and high yield method for the determination of plutonium-239 in biologic samples is reported

Separazione e dosaggio del nettunio-237 e del plutonio-239 in campioni biologici

A method is reported for the isolation, separation and determination of radiochemical amounts of neptunium-237 and plutonium-239 together present in biological samples

SYNTHESIS AND CHARACTERIZATION OF RHENIUM POLYHYDRIDES STABILIZED BY THE TRIPODAL LIGAND MEC(CH2PPH2)3

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Propriet\ue0 termodinamiche di complessi di ioni attinoidi in soluzione acquosa.

Enthalpic and entropic contributions to the formation of actinide complexes with different ligands have been evaluated. The literature data are in agreement with an entropic stabilization of the complexes, while the enthalpy term, except in few cases, opposes the complex formation. Both \u394S and \u394H values decrease with increasing coordination of ligands. Informations have been gained on the nature of reactions and bonding