6,372 research outputs found
Avaliação de híbridos intraespecíficos de brachiaria decumbens quanto à resistência à cigarrinha-das-pastagens Deois flavopict.
Edição dos resumos da 26ª Reunião Anual do Instituto Biológico, São Paulo, 2013 e 11º Congresso de Iniciação Científica em Ciências Agrárias Biológicas e Ambientais - CICAM, agosto, 2013. Resumo 060
Identificação de seqüências expressas etiquetadas (ESTs) envolvidas na interação de arroz e do fungo causador da brusone (Magnaphorte grisea).
Considerando que um dos requisitos primordiais para o uso das novas ferramentas biotecnológicas é a identificação de genes, duas bibliotecas subtrativas foram construídas utilizando-se mRNA isolado de folhas de arroz infectadas por M. grisea, com o objetivo de construir um banco de ESTs visando analisar a expressão de genes induzidos ou suprimidos durante a interação patógeno-hospedeiro. Ate o presente momento, 1232 ESTs foram geradas e a análise das mesmas, utilizando métodos computacionais, encontra-se em andamento. Adicionalmente, a fornecer informações do modelo de expressão de genes de defesa do arroz, este estudo disponibilizará genes para estudos de genômica funcional e desta maneira poderá elucidar o mecanismo de resistência da planta a este fungo.Coordenação geral: Maria Fátima Grossi de Sá
Examining associations Between School-Level Determinants and the Implementation of Physical activity Opportunities
School-based physical activity (PA) opportunities can help students engage in greater amounts of daily PA, meet PA guidelines, and lead to improved health and educational outcomes. However, we do not completely understand the organizational challenges to implementing these opportunities successfully. This exploratory study examined associations between school-level determinants and the implementation of school-based PA opportunities. We analyzed cross-sectional survey data from schools (n = 46) participating in the Healthy Zone School Program (HZSP) (Dallas, Texas, USA) during 2019-2020. Respondents completed an electronic survey that included measures of school-level determinants (e.g. culture, leadership, priority) and the implementation of school-based PA opportunities. We used linear regression models to examine associations between determinants and implementation outcomes (number of PA opportunities delivered, perceived overall success of each PA program/activity used). After adjusting for campus type (i.e. elementary, middle, high, K-12), student race/ethnicity, and percentage of economically disadvantaged students, no constructs were associated with the number of PA opportunities implemented. Linear regression models suggest access to knowledge and information (β = 0.39, P = .012, 95% CI = 0.24-1.44) and implementation climate (β = 0.34, P = .045, 95% CI = 0.02-1.59) were positively associated with the success of school-based PA opportunities. Our findings provide suggestive evidence that access to knowledge and information and a supportive school climate may improve the overall success of PA opportunities provided to students. Future research should examine additional school-level determinants to understand their importance to implementation and inform the development of strategies to improve schools\u27 capacity for implementing PA opportunities successfully
On the accuracy of the PFA: analogies between Casimir and electrostatic forces
We present an overview of the validity of the Proximity Force Approximation
(PFA) in the calculation of Casimir forces between perfect conductors for
different geometries, with particular emphasis for the configuration of a
cylinder in front of a plane. In all cases we compare the exact numerical
results with those of PFA, and with asymptotic expansions that include the next
to leading order corrections. We also discuss the similarities and differences
between the results for Casimir and electrostatic forces.Comment: 17 pages, 5 figures, Proceedings of the meeting "60 years of Casimir
effect", Brasilia, 200
Long-term optical and X-ray observations of the old novae DI Lacertae and V841 Ophiuchi
We present an analysis of ground-based optical photometry and spectroscopy,
and Rossi X-ray Timing Explorer X-ray observations of the old novae DI Lacertae
and V841 Ophiuchi. Our optical photometry data (obtained with the automated
photometry telescope RoboScope) comprise an almost decade-long light curve for
each star, while the contemporaneous spectroscopy and X-ray observations
repeatedly sampled each nova during separate intervals of ~45-55 d in length.
The long-term optical light curves of both novae reveal quasiperiodic
variability on typical time scales of ~30-50 d with amplitudes of dV ~ 0.4-0.8
mag. V841 Oph also displays a long-term, sinusoidal modulation of its optical
light on a time scale of 3.5-5 yr. The optical spectra of these novae display
quite different characteristics from each other, with DI Lac showing narrow
Balmer emission cores situated in broad absorption troughs while V841 Oph
exhibits strong single-peaked Balmer, He I and He II emission lines. We find
little change between spectra obtained during different optical brightness
states. The X-ray count rates for both novae were very low (< ~1.5 ct/s) and
there was no reliable correlation between X-ray and optical brightness. The
combined X-ray spectrum of DI Lac is best fit by a bremsstrahlung emission
model (with kT ~ 4 keV and N_H < 1.8x10^22 cm^-3); the X-ray spectrum of V841
Oph is too weak to allow model fitting. We discuss the possible origin of
variability in these old novae in terms of magnetic activity on the secondary
star, dwarf nova type disk instabilities, and the ``hibernation'' scenario for
cataclysmic variable stars.Comment: 16 pages, 9 figures, 4 tables; accepted by PASP on 28 August 2000 for
the December 2000 issu
Monitoramento de percevejo castanho em sistemas integrados de produção da Embrapa Gado de Corte.
Comissão organizadora: Grácia Maria Soares Rosinha, Alexandra Rocha de Oliveir, Rodrigo Carvalho Alva
Simulated soybean pod and flower injuries and economic thresholds for Spodoptera eridania (Lepidoptera: Noctuidae) management decisions.
Avaliação de genótipos de Brachiaria quanto à resistência às cigarrinhas-das-pastagens (Hemiptera: Cercopidae).
Comissão organizadora: Grácia Maria Soares Rosinha, Alexandra Rocha de Oliveir, Rodrigo Carvalho Alva
Influence of severity and level of injury on the occurrence of complications during the subacute and chronic stage of traumatic spinal cord injury:a systematic review
Objective: Secondary health conditions (SHCs) are long-term complications that frequently occur due to traumatic spinal cord injury (tSCI) and can negatively affect quality of life in this patient population. This study provides an overview of the associations between the severity and level of injury and the occurrence of SHCs in tSCI. Methods: A systematic search was conducted in PubMed and Embase that retrieved 44 studies on the influence of severity and/or level of injury on the occurrence of SHCs in the subacute and chronic phase of tSCI (from 3 months after trauma). The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. Results: In the majority of studies, patients with motor-complete tSCI (American Spinal Injury Association [ASIA] Impairment Scale [AIS] grade A or B) had a significantly increased occurrence of SHCs in comparison to patients with motor-incomplete tSCI (AIS grade C or D), such as respiratory and urogenital complications, musculoskeletal disorders, pressure ulcers, and autonomic dysreflexia. In contrast, an increased prevalence of pain was seen in patients with motor-incomplete injuries. In addition, higher rates of pulmonary infections, spasticity, and autonomic dysreflexia were observed in patients with tetraplegia. Patients with paraplegia more commonly suffered from hypertension, venous thromboembolism, and pain. Conclusions: This review suggests that patients with a motor-complete tSCI have an increased risk of developing SHCs during the subacute and chronic stage of tSCI in comparison with patients with motor-incomplete tSCI. Future studies should examine whether systematic monitoring during rehabilitation and the subacute and chronic phase in patients with motor-complete tSCI could lead to early detection and potential prevention of SHCs in this population
Observations of the Magnetic Cataclysmic Variable VV Puppis with the Far Ultraviolet Spectroscopic Explorer
We present the first far-ultraviolet (FUV) observations of the magnetic
cataclysmic variable VV Puppis, obtained with the Far Ultraviolet Spectroscopic
Explorer satellite. In addition, we have obtained simultaneous ground-based
optical photometric observations of VV Pup during part of the FUV observation.
The shapes of the FUV and optical light curves are consistent with each other
and with those of past observations at optical, extreme-ultraviolet, and X-ray
wavelengths. Time-resolved FUV spectra during the portion of VV Pup's orbit
when the accreting magnetic pole of the white dwarf can be seen show an
increasing continuum level as the accretion spot becomes more directly visible.
The most prominent features in the spectrum are the O VI 1031.9A, 1037.6A
emission lines. We interpret the shape and velocity shift of these lines in the
context of an origin in the accretion funnel near the white dwarf surface. A
blackbody function with T > 90,000 K provides an adequate fit to the FUV
spectral energy distribution of VV Pup.Comment: 18 pages, 6 figures, 1 table; to be published in the Astronomical
Journa
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