16,150 research outputs found
Dynamical Casimir effect with Dirichlet and Neumann boundary conditions
We derive the radiation pressure force on a non-relativistic moving plate in
1+1 dimensions. We assume that a massless scalar field satisfies either
Dirichlet or Neumann boundary conditions (BC) at the instantaneous position of
the plate. We show that when the state of the field is invariant under time
translations, the results derived for Dirichlet and Neumann BC are equal. We
discuss the force for a thermal field state as an example for this case. On the
other hand, a coherent state introduces a phase reference, and the two types of
BC lead to different results.Comment: 12 page
In situ localization of three cDNA sequences associated with the later stages of aposporic embryo sac development of Brachiaria brizantha.
Comparison of the C-mediating killing activity and C-activating properties of mouse monoclonal and polyclonal antibodies against Trypanosoma cruzi
A Mouse polyclonal antiserum against Trypanosoma cruzi or its IgG and IgM fractions and five monoclonal antibodies (two IgM, two IgG1 and one IgG2a) recognize and combine with membrane components of trypomastigote forms of the parasite as revealed by immunofluorescence. Although all these antibodies sensitize trypomastigotes and prepare them to activate the complement (C) system, as measured by consumption of total C, C4, B and C3, only the polyclonal antiserum or its IgG, IgM and Fabμ fragments were able to induce trypanosome lysis by the alternative C pathway
Morphometric signature of sediment particles reveals the source and emplacement mechanisms of submarine landslides
The long travel distances recorded by most submarine landslides indicate that changes in particle attributes (shape and size) may occur during their movement. Yet, little is known about the magnitude of such changes, and their underlying physical drivers. In order to understand the failure characteristics of submarine landslides, a dynamic image analyzer was used to characterize the particle size(s), aspect ratio, sphericity, and convexity of 200 samples recovered from two IODP sites (C0018 and C0021) offshore Nankai (SE Japan). The two IODP sites drilled a series of submarine landslides, and undisturbed slope sediment, previously characterized in detail on 3D seismic data. The results of this work reveal no perceptive differences for particle size and shape between landslide and undisturbed slope strata, suggesting that remobilized sediment, sourced from marine deposits accumulated on the upper slope of Nankai do not change through slope instability. This lack of particle attribute differences between remobilized (landslide) and undisturbed sediment, and between the two IODP Sites, suggests limited interaction between particles during their movement. A fluidization mechanism is therefore proposed whereby the soft and saturated state of deep-sea sediment leads to the development of excess pore water pressure. This mechanism maintains movement and inhibits particle-to-particle contact, limiting subsequent particle shape, and size variations in the failed sediment
Genetic Polymorphism in Evolving Population
We present a model for evolving population which maintains genetic
polymorphism. By introducing random mutation in the model population at a
constant rate, we observe that the population does not become extinct but
survives, keeping diversity in the gene pool under abrupt environmental
changes. The model provides reasonable estimates for the proportions of
polymorphic and heterozygous loci and for the mutation rate, as observed in
nature
The Dynamical State fo the Starless Dense Core FeSt 1-457: A Pulsating Globule?
High resolution molecular line observations of CS, HCO+, C18O and N2H+ were
obtained toward the starless globule FeSt 1-457 in order to investigate its
kinematics and chemistry. The HCO+ and CS spectra show clear self-reversed and
asymmetric profiles across the face of the globule. The sense of the observed
asymmetry is indicative of the global presence of expansion motions in the
outer layers of the globule. These motions appear to be subsonic and
significantly below the escape velocity of the globule. Comparison of our
observations with near-infrared extinction data indicate that the globule is
gravitationally bound. Taken together these considerations lead us to suggest
that the observed expansion has its origin in an oscillatory motion of the
outer layers of the globule which itself is likely in a quasi-stable state near
hydrostatic equilibrium. Analysis of the observed linewidths of CO and N2H+
confirm that thermal pressure is the dominant component of the cloud's internal
support. A simple calculation suggests that the dominant mode of pulsation
would be an l = 2 mode with a period of 0.3 Myr. Deformation of the globule due
to the large amplitude l = 2 oscillation may be responsible for the
double-peaked structure of the core detected in high resolution extinction
maps. Detailed comparison of the molecular-line observations and extinction
data provides evidence for significant depletion of C18O and perhaps HCO+ while
N2H+ may be undepleted to a cloud depth of about 40 magnitudes of visual
extinction.Comment: to appear in ApJ vol 665 20 August 2007
Avaliação e seleção de progênies de cupuaçuzeiro (Theobroma grandiflorum), em Belém, Pará.
Este trabalho teve por objetivo a seleção entre e dentro de progênies de irmãos completos de cupuaçuzeiro. Foram avaliadas 21 progênies de irmãos completos, em dois experimentos, com cinco plantas por parcela. Os experimentos foram avaliados ao nível de indivíduos, em cada safra, para os caracteres: produção de frutos, polpa e semente, bem como resistência à vassoura-de-bruxa. Para efeito de seleção, também foi considerado o grau de parentesco das matrizes. As análises foram conduzidas via metodologia de modelos lineares mistos, como delineamento em blocos incompletos, desbalanceados com tratamentos comuns. Foram estimados os parâmetros genéticos e os valores genotípicos ajustados de progênies, bem como os valores genéticos aditivos e genotípicos individuais. Os resultados demonstraram que as progênies 12; 13; 18; 20; 21 e 24 tiveram os melhores desempenhos para as variáveis de produção. Entre elas, as pro- gênies 12; 13 e 18 foram as que mais se destacaram. Foram selecionadas três matrizes da progênie 18, duas matrizes da progênie 12 e uma matriz de cada uma das progênies 13; 20 e 21. É possível concluir que essas matrizes, juntamente com materiais selecionados em outras áreas experimentais, apresentam potencial para compor um pomar de sementes clonais, estabelecido em lote isolado de outros plantios, onde será produzida uma população melhorada de primeiro ciclo que se constituirá na nova cultivar de cupuaçuzeiro
Caracterização molecular de um membro da família Multidrug and Toxic Compound Extrusion (MATE) que confere tolerância ao alumínio em sorgo.
A thick shell Casimir effect
We consider the Casimir energy of a thick dielectric-diamagnetic shell under
a uniform velocity light condition, as a function of the radii and the
permeabilities. We show that there is a range of parameters in which the stress
on the outer shell is inward, and a range where the stress on the outer shell
is outward. We examine the possibility of obtaining an energetically stable
configuration of a thick shell made of a material with a fixed volume
Effect of temperature in Amylase and amyloglucosidase produced from english potato residue via fermentation in solid state.
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