We used a video digitizer system to (a) measure changes in the pattern of longitudinal surface extension in primary roots of maize (Zea mays L.) upon application and withdrawal of auxin and (b) compare these patterns during gravitropism in control roots and roots pretreated with auxin. Special attention was paid to the distal elongation zone (DEZ), arbitrarily defined as the region between the ...

C iência & Súde C otiva, 13(Su:569-577, 2008 Barreiro EJ. Desenvolvimento de novos fármacos. Palestra apresentada na mesa-redonda: Ética no desenvolvimento de fármacos. XIV Congresso Paulista de Farmacêuticos, São Paulo, 2005. [acessado 2007 Dez 05]. Disponível em: http://www.farmacia. ufrj.br/lassbio/download/XIV_congPaulista.pdf Waxman HA. The lessons of Vioxx. Drug safety and sales. N Engl J...

Autonomous navigation of mobile robots through unstructured terrain presents many challenges. The task becomes even more difficult with increasing obstacle density, at higher speeds, and when a priori knowledge of the terrain is not available. Reactive navigation schemas are often dismissed as overly simplistic or considered to be inferior to deliberative approaches for off-road navigation. The...

RESUMO Na Parte I deste artigo, o autor explicou as dificuldades em alcançar a acurácia dos diagnósticos de enfermagem, a relevância do pensamento crítico no alcance dessa acurácia e as mais novas perspectivas desse pensamento. Na Parte II, as dimensões do pensamento crítico identificadas como importantes para a prática de enfermagem são aplicadas em um estudo de caso de uma menina de 16 anos c...

Morbid obesity is an increasingly common problem worldwide6, and therefore, there is increasing utilization of surgical procedures for the treatment of this disease5. One of the preferred techniques is the Roux-en-Y gastric bypass. This technique which generally leads to rapid weight loss is associated with the formation of biliary calculi and consequently to its complications (e.g., acute panc...

 The concentrations of Cd, Pb, Ni and Hg were determined in gill, liver and muscle of Barbus xanthopterus in down streams of Karoon and Dez Rivers during summer 2009. Heavy metal concentrations varied significantly, depending on the types of the tissue in fish species. The levels of heavy metals such as Cd, Pb, Ni and Hg in the Barbus xanthopterus of Karoon River were higher than in B...

 The concentrations of Cd, Pb, Ni and Hg were determined in gill, liver and muscle of Barbus xanthopterus in down streams of Karoon and Dez Rivers during summer 2009. Heavy metal concentrations varied significantly, depending on the types of the tissue in fish species. The levels of heavy metals such as Cd, Pb, Ni and Hg in the Barbus xanthopterus of Karoon River were higher than in Barbus xant...

In this paper, an improved Ant Colony Optimization (ACO) algorithm is proposed for reservoir operation. Through a collection of cooperative agents called ants, the near-optimum solution to the reservoir operation can be e ectively achieved. To apply the proposed ACO algorithm, the problem is approached by considering a nite horizon with a time series of in ow, classifying the reservoir volume t...