27,095 research outputs found
The rich-club phenomenon across complex network hierarchies
The so-called rich-club phenomenon in a complex network is characterized when
nodes of higher degree (hubs) are better connected among themselves than are
nodes with smaller degree. The presence of the rich-club phenomenon may be an
indicator of several interesting high-level network properties, such as
tolerance to hub failures. Here we investigate the existence of the rich-club
phenomenon across the hierarchical degrees of a number of real-world networks.
Our simulations reveal that the phenomenon may appear in some hierarchies but
not in others and, moreover, that it may appear and disappear as we move across
hierarchies. This reveals the interesting possibility of non-monotonic behavior
of the phenomenon; the possible implications of our findings are discussed.Comment: 4 page
Controle de podridões-radiculares na cultura do feijoeiro: eficácia da aplicação de fungicidas no sulco de plantio.
O controle de podridões-radiculares via tratamento de sementes tem sido errático, com históricos de sucesso e insucesso em diversas regiões produtoras de feijão. A pulverização de fungicidas no sulco de plantio, já utilizada em outras culturas, como o algodão e a batata, surge como alternativa a este tratamento padrão. Por este motivo, diversos fungicidas foram testados quanto a sua eficiência no controle de podridões radiculares via pulverização no sulco de plantio do feijoeiro.bitstream/CNPAF/19135/1/doc_118.pdfConvênio: Embrapa Arroz e Feijão e Hokko do Brasil
Compatibilidade de fungicidas e inseticidas no tratamento de sementes do feijoeiro (Phaseolus vulgaris L.) associadas ou não a polímeros: relatório técnico.
Tratamento de sementes do feijoeiro com inseticida; Revestimento de sementes do feijoeiro tratadas com inseticidas e fungicidas; Experimento I - Qualidade fisiológica e sanitária; Experimento II - Teste de campo; Experimento III - Avaliação da eficiência de controle de adultos da mosca branca, Bemisia argentifolii; Conclusão; Referências bibliográficas; Anexos..bitstream/CNPAF/19141/1/doc_125.pdfCooperação técnica: Embrapa Arroz e Feijão & Bayer S/A
Efeito da mistura de fungicidas aplicados via fungigação no controle do mofo-branco do feijoeiro comum.
Procurando otimizar a eficácia de controle, este trabalho objetivou determinar o efeito preventivo e residual de fungicidas utilizados em mistura e aplicados via fungigação para o controle do mofo-branco do feijoeiro.bitstream/CNPAF/19129/1/pqfoco62.pd
Efficiency of low versus high airline pressure in stunning cattle with a pneumatically powered penetrating captive bolt gun
The efficiency of stunning cattle was assessed in 443 animals (304 pure Zebu and 139 crossbred cattle), being mainly mature bulls and cows. Cattle were stunned using a Jarvis pneumatically powered penetrating captive bolt gun operating with low (160–175 psi, N = 82) and high (190 psi, N = 363) airline pressure, which was within the manufactures specifications. Signs of brain function and the position of the shots on the heads were recorded after stunning. Velocity of the captive bolt and its physical parameters were calculated. Cattle shot with low pressures showed more rhythmic respiration (27 vs. 8%, P < 0.001), less tongue protrusion (4 vs. 12%, P = 0.03) and less masseter relaxation (22 vs. 48%, P < 0.001). There was an increased frequency of shots in the ideal position when cattle were shot with the low compared to high airline pressures (15.3 vs. 3.1%). Bolt velocity and its physical parameters were significantly (P < 0.01) higher when using high pressure. Airline pressures below 190 psi are inappropriate when shooting adult Zebu beef cattle with pneumatically powered penetrating captive bolt guns
Characterizing neuromorphologic alterations with additive shape functionals
The complexity of a neuronal cell shape is known to be related to its
function. Specifically, among other indicators, a decreased complexity in the
dendritic trees of cortical pyramidal neurons has been associated with mental
retardation. In this paper we develop a procedure to address the
characterization of morphological changes induced in cultured neurons by
over-expressing a gene involved in mental retardation. Measures associated with
the multiscale connectivity, an additive image functional, are found to give a
reasonable separation criterion between two categories of cells. One category
consists of a control group and two transfected groups of neurons, and the
other, a class of cat ganglionary cells. The reported framework also identified
a trend towards lower complexity in one of the transfected groups. Such results
establish the suggested measures as an effective descriptors of cell shape
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