Foraging and feeding requirements shape ecologic and evolutionary patterns for many predatory organisms. The idea that organisms maximize energy intake during foraging is one of the major assumptions of foraging theories (Schoener 1971; Pyke et al. 1977). From recent studies (for review see Brown & Kotler 2004) it is apparent that foraging decisions are not strictly related to meal size but tha...

There is a great interest in electronic transitions in hydrogen-rich materials under extreme conditions. It has been recently suggested that the group IVa hydrides such as methane (CH(4)), silane (SiH(4)), and germane (GeH(4)) become metallic at far lower pressures than pure hydrogen at equivalent densities because the hydrogen is chemically compressed in group IVa hydride compounds. Here we re...

OBJECTIVE To characterize the motorcycle accidents occurred in the city of São Paulo, SP, Brazil in the year 2013, with emphasis on information about hospital admissions from SIH/SUS. METHODS This is a retrospective cross-sectional study. The study covered 5,597 motorcyclists traumatized in traffic accident during the year 2013 occurred in the city of São Paulo. A survey was conducted using s...

During vertebrate embryogenesis, hematopoietic stem cells (HSCs) arise in the aorta-gonads-mesonephros (AGM) region. We report here that blood flow is a conserved regulator of HSC formation. In zebrafish, chemical blood flow modulators regulated HSC development, and silent heart (sih) embryos, lacking a heartbeat and blood circulation, exhibited severely reduced HSCs. Flow-modifying compounds p...

The use of Karstedt's catalyst to study the reduction of Me2NCHO (DMF) by the popular "dual SiH"-containing tetramethyldisiloxane, HMe2SiOSiMe2H (1), has revealed that the first step in the process involves an initial single hydrosilylation to form HSiMe2OSiMe2OCH2NMe2 (3). This intermediate is readily isolated and purified via distillation. In the continued presence of the catalyst, 3 transfor...

A kinetic study of chemical vapor deposition of tungsten silicide films was made, focusing on the reactivity and molecular size of film precursors. Tungsten silicide (WSL) fllms were deposited by low pressure CVD from SiH, and WF,. The molecular size of the film precursor was calculated to fit to the diffusion coefficient obtained from the deposition rate profile in a tubular reactor. Typically...

Azasilazirconacycle Cp2Zr{κ(2)-N(SiHMe2)SiHMeCH2} (1) and formaldehyde react through an uncatalyzed addition reaction (hydrosilylation) to form an exocyclic methoxysilyl-substituted zirconacycle. Although 1 contains 2-center-2-electron SiH groups, this transformation parallels the reactions of non-classical [Cp2ZrN(SiHMe2)2](+) ([2](+)) with carbonyls. Reactions of 1 with a series of nucleophil...

Smoke injection height (SIH) determines the distance and direction of smoke transport, thus impacting atmospheric environment. In this study, we used Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations data coupled with Moderate Resolution Imaging Spectroradiometer (MODIS) Hybrid Single-Particle Lagrangian Integrated Trajectory model to derive SIH values during peak forest grassland ...

The bandgap energy and band alignment of the CdS/SiH vdW heterostructure were modified by applying biaxial strain an external electric field.