Aplicações agroecológicas do cultivo do trigo.

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A Robust Filter for the BeppoSAX Gamma Ray Burst Monitor Triggers

The BeppoSAX Gamma Ray Burst Monitor (GRBM) is triggered any time a statistically significant counting excess is simultaneously revealed by at least two of its four independent detectors. Several spurious effects, including highly ionizing particles crossing two detectors, are recorded as onboard triggers. In fact, a large number of false triggers is detected, in the order of 10/day. A software code, based on an heuristic algorithm, was written to discriminate between real and false triggers. We present the results of the analysis on an homogeneous sample of GRBM triggers, thus providing an estimate of the efficiency of the GRB detection system consisting of the GRBM and the software.Comment: Proc. 5th Huntsville GRB Symposiu

Recomendações de cultivares, zoneamento e épocas de semeadura para a cultura do trigo em Mato Grosso do Sul, safra 1997.

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Dinâmica espacial da produção brasileira de soja no período de 1975 a 2003.

Especialmente nos últimos quarenta anos as transformações de ordem tecnológica e econômica ocorridas no Brasil ocasionaram expressivas mudanças na exploração da agricultura nacional. Dentre as atividades agrícolas que apresentaram as mudanças mais acentuadas, destaca-se a sojicultura. Assim, partindo de dados relativos aos anos de 1975, 1985, 1995 e 2003, foi realizada uma análise da dinâmica espacial associada com o cultivo da soja no País. Para tanto, com base em dados históricos de exploração da soja, que compreendem as dimensões regional, estadual e microrregional, foram estimados e analisados, principalmente, indicadores de assimetria e de concentração, distâncias de transvariação e de cantor e centros de gravidade. Dentre as conclusões do estudo, são destacadas três: 1) nas últimas décadas, a soja passou a ser cultivada de forma significativa em praticamente todas as regiões brasileiras; 2) no período analisado, houve grandes mudanças em termos de concentração e de localização espacial na produção sojícola; e 3) as estimativas dos centros de gravidade mostraram que, ao longo do tempo, tem ocorrido redução na velocidade de deslocamento do cultivo da oleaginosa no País. Abstract: In the last forty years the transformations of technological and economical order that occurred in Brazil determined expressive changes in the exploitation of the national agriculture. The soybean production is among the activities that presented the most accentuated changes. This work aimed to analyze the spatial dynamics associated with the soybean cultivation in the country. To carry out these analyses, historical data of soybean production of the years 1975, 1985, 1995 and 2003 were used. These data include the regional, state and microregional dimensions. In methodological terms, the analyses developed were associated with asymmetry and concentration indicators, transvariation and cantor distances and centers of gravity. Based on the obtained results, three conclusions were drawn: 1) in the last decades, the soybean cultivation increased significantly in nearly all the Brazilian regions; 2) in the analyzed period, the concentration and spatial location in the soybean production changed greatly; and 3) the estimates of the centers of gravity showed that, along the time, the speed of displacement of soybean cultivation in Brazil has been reduced

Epidemiology and In Vitro Activity of Ceftazidime/Avibactam, Meropenem/Vaborbactam and Imipenem/Relebactam against KPC-Producing K. pneumoniae Collected from Bacteremic Patients, 2018 to 2020

The management of KPC-producing K. pneumoniae (KPC-Kp) in bloodstream infections (BSIs) represent a serious clinical challenge. In this study, the aim is to assess the incidence of resistance to novel β-lactams-β-lactamase inhibitor combinations (βL-βLICs), such as ceftazidime-avibactam (CAZ-AVI), meropenem-vaborbactam (MER-VAB) and imipenem-relebactam (IMI-REL), in KPC-Kp strains collected during a three-year period from patients with bacteremia. KPC-Kp strains resistant to βL-βLICs were selected for whole-genome sequencing. A total of 133 K. pneumoniae strains were isolated, and KPC-Kp strains were the most represented (87.2%). In 2018, resistance to CAZ-AVI and MER-VAB was 6.5% and 14.5%, respectively. In 2019, KPC-Kp resistance to CAZ-AVI and MER-VAB remained at low levels, with values of 12.9% and 3.2%, respectively. During 2020, CAZ-AVI resistance was detected in 2/23 of KPC-Kp strains (8.7%). IMI-REL was the most active βL-βLIC, inhibiting >98% of the isolates, while CAZ-AVI and MER-VAB inhibited 87-93% and 85-97% of the KPC producers, respectively. Correlations between genotypic traits and resistance to βL-βLICs showed that KPC-Kp strains resistant to CAZ-AVI harbored a mutation within the blaKPC-3 gene, while all KPC-Kp strains resistant to CAZ-AVI, MER-VAB and/or IMI-REL carried the blaKPC-3 gene. Moreover, genetic analysis of porin genes showed that 14/16 of KPC-Kp resistant isolates possessed a truncated OmpK35 and glycine (G) and aspartic acid (D) insertions at positions 134-135 within OmpK36, whereas 2/16 displayed truncated OmpK35 and OmpK36 porins. Novel βL-βLICs are promising agents against KPC-Kp infections; however, the emergence of resistance to these agents highlights the need for continuous surveillance and application of enhanced antimicrobial stewardship