Ocorrência e sobrevivência de Botryodiplodia theobromae Papouillard em sementes de algodoeiro (Gossypium hirsutum L.) produzidas no estado de Minas Gerais.

No presente trabalho, avaliou-se a ocorrência de B. theobromae (Papouillard 1892) em sementes de algodoeiro das regiões do Triângulo e Norte do Estado de Minas Gerais, safra 90/91, utilizando-se sementes com e sem linter. O fungo foi detectado em 100% das amostras de sementes provenientes da região do Triângulo, independentemente da presença de linter. Na região Norte, foi detectado em 90,2 e 82% das sementes analisadas com e sem linter, respectivamente. Os níveis de ocorrência nas amostras estiveram, em geral, abaixo de 25%, que é a proposta para o padrão de tolerância do fungo na classe de sementes certificadas/ fiscalizadas no Brasil e menores na região Norte. A maioria das amostras apresentou crescimento médio de B.theobromae por semente, cobrindo mais de 50% de sua superfície visível, estimado através da atribuição de notas. A ocorrência de B. theobromae em sementes armazenadas durante 11 meses, sofreu declinio acentuado a partir do quarto mês e atingiu níveis próximos a zero a partir do oitavo mês, quando as sementes foram mantidas em ambiente de laboratório. A ocorrência do patógeno foi preservada ao longo deste período, quando as sementes foram mantidas em câmara fria e seca. A avaliação do percentual de germinação das sementes realizada em três épocas. durante o período de armazenamento, mostrou aumento aos 6 e 11 meses. sendo este efeito maior em ambiente de laboratório

Modelo experimental para pesquisa e desenvolvimento de aditivos alternativos para frangos de corte.

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Cultivares de milho para silagem: recomendações para as Regiões Sul, Sudeste e Brasil-Central.

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Caracterização de acessos silvestres de maracujazeiro com base em descritores morfoagronômicos.

Existem espécies silvestres de maracujazeiros que possuem potencial agronômico para a utilização no melhoramento genético e no desenvolvimento de variedades e híbridos, porém a escassez de informações morfoagronômicas dessas espécies silvestres indica a necessidade de estudos básicos relacionados à caracterização e à avaliação do germoplasma. Este trabalho teve como objetivo caracterizar acessos silvestres de maracujazeiro, com base em descritores qualitativos e quantitativos

Electronic properties and hyperfine fields of nickel-related complexes in diamond

We carried out a first principles investigation on the microscopic properties of nickel-related defect centers in diamond. Several configurations, involving substitutional and interstitial nickel impurities, have been considered either in isolated configurations or forming complexes with other defects, such as vacancies and boron and nitrogen dopants. The results, in terms of spin, symmetry, and hyperfine fields, were compared with the available experimental data on electrically active centers in synthetic diamond. Several microscopic models, previously proposed to explain those data, have been confirmed by this investigation, while some models could be discarded. We also provided new insights on the microscopic structure of several of those centers.Comment: 21 pages, 8 figure

Recurrence in intracranial atherosclerotic disease: a stenosis-based analysis

BACKGROUND: Intracranial atherosclerotic disease is a common cause of stroke; its incidence and prevalence vary widely by ethnicity. The aim of our study was to analyze the recurrence rate of cerebrovascular events in patients with symptomatic and asymptomatic intracranial stenosis (IS). METHODS: We conducted a historical cohort study including all patients admitted in our hospital for stroke or transient ischemic attack (TIA) during 2011 and 2012 with information on intracranial circulation (ultrasonography and/or computed tomography angiography). We identified patients with symptomatic and asymptomatic IS and studied the recurrence of cerebrovascular events (TIA or ischemic stroke within the territory of the stenosis) for a minimum follow-up period of 6 months after the diagnosis of IS. For the recurrence rate estimation, patients with other potentially embolic diseases (in cervical arteries or heart) were excluded. We calculated the rate of recurrence of cerebrovascular events and performed Kaplan-Meier survival curves for symptomatic and asymptomatic IS. RESULTS: We investigated 1302 patients, mean age was 72.41 years (standard deviation 12.75). We identified 218 IS in 158 patients, 77 were symptomatic and 141 were asymptomatic. The recurrence rate of cerebrovascular events was 12.32 per 100 patient-years, with a mean time to recurrence of 1.73 months for symptomatic intracranial stenosis (SIS) and .88 per 100 patient-years for asymptomatic IS (P < .001). CONCLUSIONS: These results indicate a high risk of early recurrence of stroke in the territory of a SIS, highlighting the importance of its early diagnosis and aggressive treatment.info:eu-repo/semantics/publishedVersio

HPPD-Inhibiting herbicides alone or in tank-mix with Atrazine in elephant grass.

The interference imposed by weeds is one of the most important factors limiting elephant grass forage yield. Two experiments were carried out in 2015/2016 and 2017 to evaluate the selectivity and weed control of 4-hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting herbicides applied alone or in combination with atrazine in elephant grass. The treatments applied in the experiment conducted in Valença, Rio de Janeiro State, Brazil, were as follows: two rates of mesotrione (0.072 and 0.144 kg ha-1 + 0.5% v/v mineral oil - Assist®), two rates of tembotrione (0.075 and 0.100 kg ha-1 + 0.5% v/v mineral oil - Aureo®), atrazine + mesotrione (1.25 + 0.072 kg ha-1 + 0.5% v/v mineral oil - Assist®), atrazine + tembotrione (1.25 + 0.100 kg ha-1 + 0.5% v/v mineral oil - Aureo®), atrazine + mesotrione (1.25 + 0.072 kg ha-1), atrazine + tembotrione (1.25 + 0.100 kg ha-1) and two checks (weed-free check and weedy check). The same herbicide treatments and a check without application were applied in an experiment conducted in Coronel Pacheco, Minas Gerais State, Brazil. Two application rates of mesotrione with the addition of mineral oil or the tank mixture of atrazine plus mesotrione, with or without the addition of mineral oil, did not provide injuries capable to reduce elephant grass forage yield. Tembotrione was phytotoxic to elephant grass when applied with mineral oil. Atrazine plus tembotrione in a tank-mix, with or without mineral oil, were also phytotoxic to elephant grass. All treatments provided satisfactory weed control