995 resultados para SI SUBSTRATE
Resumo:
Esta tese toma como ponto de partida o esquecimento do si mesmo operado pelos pensadores do século XIX e resgatado por Kierkegaard em meio ao seu projeto de escritor. Dirige-se à possibilidade de uma Ciência existencial constituída a partir da resposta de Kierkegaard a este problema. Organizamos nosso trabalho em três eixos. O primeiro, desenvolvido em nossa Introdução, busca reconstruir, minimamente, o ambiente filosófico ao qual Kierkegaard quer se opor em sua preocupação pelo si mesmo. O segundo eixo se desenha ao redor da obra Doença até a morte e foi dividido em dois momentos. No primeiro momento buscamos reconstruir os elementos com os quais o autor está dialogando para pensar o que é o si mesmo e como ele se constitui. No segundo buscaremos, a partir da definição do si mesmo, as personificações ou descrições psicológicas do si mesmo, as quais se constituem como possibilidades do eu em responder ao problema de ter de ser si mesmo. Neste momento recorreremos, também, às descrições psicológicas de outro pseudônimo, Vigilius Haufniensis, na obra O conceito de angústia. O terceiro eixo é desenvolvido no último capítulo, quando seguiremos a pista de uma possível ciência existencial, a qual julgamos que foi deixada por Kierkegaard tanto nas obras que vimos no eixo anterior, quanto em seus diários e em sua obra póstuma Ponto de vista explicativo da minha obra como escritor.
The role of substrate, flow and larval supply to recruitment of the red abalone (Haliotis rufescens)
Resumo:
Precipitous declines in wild populations of the red abalone Haliotis rufescens and the eventual closure of the commercial and southern recreational fishery have led to renewed interest in supplementing wild stocks with hatchery-raised individuals. Most work to date has focused on releasing small juveniles and has had limited success. Although much is known about larval settlement, juvenile survivorship and growth of abalone, there is scanty information on natural processes in the field. The failure of many regulated fisheries worldwide suggests that both the larval and juvenile stages may be important in determining the future population, and that early juvenile mortality is more important than previously believed. This paper presents a series of experiments designed to examine factors and mechanisms that could affect settlement, survivorship, and growth of larvae and early post-settlers in the field. Laboratory trials under different flow regimes showed that red abalone larvae settled preferentially on substrates encrusted with coralline algae, and that settlement was rapid when exposed to crusts compared to other surfaces. Urchin grazing of films appeared to facilitate abalone settlement but only when urchins were removed. Initial field experiments showed that released larvae settled on natural cobble rock, and that settlement was at least one order of magnitude greater when settlement habitats were tented. I then examined post-settlement survivorship at one and two days after settlement, and found that although there was a large amount of variation, on average 10% of released larvae were found as newly-settled recruits after 1 day. Survivorship and growth of recruits were followed over at least one month in both Spring and Fall. Abalone settled at higher densities, survived better and grew faster in the warmer Fall months than in the Spring. The density of month-old abalone recruits was correlated with density of naturally-occurring gastropods in the Spring, but not in the Fall. These results suggest that settlement and survivorship can be extremely variable across space and time, and that oceanographic and local biotic conditions play a role and should be considered when planning larval seeding.