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Phytoplankton succession in intensive marine shrimp culture ponds treated with a commercial bacterial product (2002)

Yusoff, F M ; Zubaidah, M S ; Matias, H B ; [et al.]

Oxford, UK : Blackwell Science Ltd

Aquaculture research 33 (2002), S. 0

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ISSN: 1365-2109

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Succession of phytoplankton dominance was studied in shrimp culture ponds treated with commercial bacterial products. Diatoms were dominant and the cyanobacteria were absent in both treated and control ponds at the beginning of the culture period. After 34 days, the diatoms significantly decreased whereas cyanobacteria increased in both ponds. Chlorophyll a increased from a mean of 35.56 mg m−3 in the first phase to 186.00 mg m−3 in the final phase, and from 42.12 mg m−3 to 242.81 mg m−3 in the treated and control ponds respectively. Cyanobacteria were significantly higher in the control compared with the treated ponds during the final phase of the culture. Algal bioassay showed that the addition of nitrogen either alone or with silica to pond water significantly increased the specific growth rate of Chaetoceros calcitrans. The specific growth rate of Oscillatoria sp. significantly increased when a combination of nitrogen, phosphorus and carbon was added to the pond water. Addition of silica seemed to depress the growth rate of Oscillatoria sp. Nutrient enrichment should be minimized and the supply of nitrogen and silica should be adequate for promoting the growth of beneficial phytoplankton in aquaculture systems.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1355-557x.2002.00671.x

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Structure of styrene-butadiene-styrene block copolymers by diffusion analysis (1977)

Chiang, Kwan T. ; Sefton, Michael V.

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1927-1935

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ISSN: 0098-1273

Keywords: Physics ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: In this study, solvent sorption was used to investigate the morphology of a styrene-butadiene-styrene (SBS) triblock copolymer. The sorption process was found to deviate from the normal Fickian character, usually found in conventional elastomer-solvent systems, because of the presence of an interfacial region for both polybutadiene and polystyrene. This interphase absorbed solvent at a temperature below its glass transition and contributed to the resulting non-Fickian time-dependent diffusion process. The equilibrium diffusion coefficient was estimated to be 3.2 × 10-7 cm2/sec regardless of the casting surface. Nevertheless, according to the sorption measurements, the casting surface did have an effect on the approach to equilibrium. The results indicated a denser packing of the molecules and hence a decreased diffusion coefficient for Teflon and glass cast films, because of internal stresses left within the films during casting.

Additional Material: 4 Ill.