Navigation of motoneuronal growth cones toward the somatic musculature in Drosophila serves as a model system to unravel the molecular mechanisms of axon guidance and target selection. In a large-scale mutagenesis screen, we identified piranha, a motor axon guidance mutant that shows strong defects in the neuromuscular connectivity pattern. In piranha mutant embryos, permanent defasciculation e...

the purpose of this study is to describe the histological and histochemical features of digestive tract intwo aquarium fishes with different types of feeding habits which are omnivorous (walking catfish) andcarnivorous (piranha), respectively. five adult walking catfish (l: 26.4 ± 3.4 cm, w: 265 ± 55 g) and fiveadult piranha (l: 23.6 ± 4.5 cm, w: 247 ± 50 g) were used for this study. the fishes...

Biosensing systems based on detecting changes in cantilever surface stress have attracted great interest. To achieve high reliability of measurements, high quality and high reproducibility in functionalization of the sensor surface are key points. In this paper, we investigate different methods to clean and regenerate the sensing surface of cantilever biosensors. Perchloric acid potential sweep...

This paper examines the effect of five major pretreatments on the surface coverage Γ(m) of dodecanethiol self-assembled monolayer on polycrystalline gold electrode (C(12)SH-SAMs-Au). It is based on the electrochemical reductive desorption in the alkaline solution by cyclic voltammetry (CV). The five different pretreatment methods include: aqua regia pretreatment, reductive annealed pretreatment...

Fish sounds are known to be species-specific, possessing unique temporal and spectral features. We have recorded and compared sounds in eight piranha species to evaluate the potential role of acoustic communication as a driving force in clade diversification. All piranha species showed the same kind of sound-producing mechanism: sonic muscles originate on vertebrae and attach to a tendon surrou...

In this paper we present a specialised algebraic manipulation package devoted to Celestial Mechanics. The system, called Piranha, is built on top of a generic and extensible framework, which allows to treat e ciently and in a uni ed way the algebraic structures most commonly encountered in Celestial Mechanics (such as multivariate polynomials and Poisson series). In this contribution we explain...

We have modified and stabilized the ruthenium surface by depositing a self-assembled monolayer (SAM) of 1-hexadecanethiol on a polycrystalline ruthenium thin film. The growth mechanism, dynamics, and stability of these monolayers were studied. SAMs, deposited under ambient conditions, on piranha-cleaned and piranha + H2SO4 cleaned substrates were compared to monolayers formed on H-radical-clean...

Revisions of two new species groups of the genus Agra Fabricius are presented with the following species described as new: pusilla group Agra cruciaria sp. n. (Brazil), Agra grace sp. n. (Ecuador, Perú), Agra max sp. n. (Brazil), Agra minasianus sp. n. (Brazil), Agra notpusilla sp. n. (Brazil), Agra pseudopusilla sp. n. (Brazil); piranha group Agra ce sp. n. (Perú), Agra risseri sp. n. (Bolivia...

Computer parently reordering instructions from nearby program regions, but even sophisticated compiler scheduling is fundamentally limited by the compiler’s inability to perfectly determine the programmer’s intent and its commitment to preserve the program’s high-level structure and semantics. Given the amount of parallel work being done, we could conceivably build a superscalar processor with ...

We examined the effects of acute low-pH exposure on ion balance (Na+, Cl-, K+) in several species of fish captured from the Rio Negro, a dilute, acidic tributary of the Amazon. At pH 5.5 (untreated Rio Negro water), the four Rio Negro species tested (piranha preta, Serrasalmus rhombeus; piranha branca, Serrasalmus cf. holandi; aracu, Leporinus fasciatus; and pacu, Myleus sp.) were at or near io...