Uso de estruturas flutuantes realocáveis para o cultivo de ostras em áreas sujeitas a grandes variações de salinidade.

ODS 14: Vida na água

Recomendações para o uso de coletores artificiais, para a captação, o manejo e o transporte de sementes de ostras nativas do gênero crassostrea em ambientes estuarinos da Costa Brasileira.

ODS 2, ODS 14

Composición botánica de la dieta de alpaca ( Lama pacos Linn.) en un pastizal del secano mediterráneo de la zona central de Chile.

The re-introduction of domestic South American camelids (alpacas and llamas) in the central zone of Chile makes it necessary to study their behaviour and adaptability. Since it is fundamental to characterize the camelid’s diet, the present work had as an objective the determination of the plant species selected by the alpacas ( Lama pacos Linn.) in different phenological stages (vegetative, reproductive and dry season). The study was carried out over three years in a paddock of 2.5 ha of sparse shrubland dominated by Acacia caven (Mol.) Mol. and annual species in the herbaceous stratum, which were continually grazed by five male alpacas. The botanical composition and the forage dry matter available for grazing in the pasture was evaluated. Botanical composition of diets was estimated with the microhistological technique, using dung samples collected directly from the rectum. During the vegetative season, the most consumed plant species were annual and perennial grasses. In the reproductive season, the most important components of the diet were woody plant species, annual grasses and forbs. In the dry season, the diet was composed of a high percentage of woody plant species.La reintroducción de camélidos sudamericanos domésticos (alpaca y llamas) en la zona central de Chile, hace necesario estudiar su comportamiento y adaptabilidad. En este contexto, la caracterización de la dieta es fundamental. Por ello, el presente trabajo tuvo como objetivo determinar las especies vegetales seleccionadas por las alpacas en diferentes etapas fenológicas del pastizal (vegetativo, reproductivo y seco). El estudio se realizó durante tres temporadas en un potrero de 2,5 ha ocupado por un matorral claro dominado por Acacia caven (Mol.) Mol. y especies anuales en el estrato herbáceo, las cuales fueron pastoreadas continuamente por cinco alpacas macho. En la pradera se evaluó la composición botánica y la disponibilidad de la materia seca bajo pastoreo. La composición botánica de la dieta fue estimada mediante la técnica microhistológica, utilizando muestras de fecas colectadas directamente del recto de los animales. Las especies más consumidas en el período vegetativo fueron las poáceas anuales y perennes. En el período reproductivo, las especies leñosas, poáceas anuales y dicotiledóneas herbáceas fueron los componentes más importantes de la dieta. En el período seco, la dieta estuvo constituida en un alto porcentaje por especies leñosas

GSH : Electrochemical assessment of adduct formation with nimodipine and propranolol

The present paper demonstrates through voltammetric methods and UV spectroscopy the feasibility of the in vitro adduct formation Glutathione-Nimodipine and Glutathione- Propranolol in absence of enzymatic catalysis. The effect of pH, temperature and reaction media on the adduct formation is assessed. Under physiological canditions (pH 7.4, 37°C) the apparent affinity constants were: Kapp GSH-NMD= 1.21-106 M-1; Kapp GSH-PRP=7.64-103 M_1 and a 1:1 molar ratio for both interactions were found. Thermodynamic data indicate that the adduct formations were spontaneous

Voltammetric Behaviour of Cre-319, a Novel Dihydropyridine Calcium Antagonist And Its Polarographic, Uv Spectrophotometric and Hplc Determination

CRE-319, a novel 1,4-dihydropyridine derivative, produces a cathodic polarographic peak due to the reduction of its nitro group according to the following well-known general pathway for the nitro group. The electrode mechanism is strongly dependent on the pH of the solution and follows a similar behaviour to that previously reported for nitrobenzene. The peak current shows a linear dependence with CRE-319 concentrations. This behaviour is used for analytical purposes in determining CRE-319 content in solution. In order to obtain comparative results, we have also developed a spectrophotometric andan HPLC method for quantifying CRE-319. © 1992, Taylor & Francis Group, LLC. All rights reserved