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Partitioning of the diffuse attenuation coefficient for photosynthetically available irradiance in a deep dendritic tropical lake Anais da ABC (AABC)
BRANDÃO,LUCIANA P.M.; BRIGHENTI,LUDMILA S.; STAEHR,PETER A.; BARBOSA,FRANCISCO A.R.; BEZERRA-NETO,JOSÉ F..
ABSTRACT We studied the effects of particulate and dissolved optically active components on the attenuation of photosynthetic active radiation (PAR) in a tropical lake. The temporal and spatial distribution of tripton, Chl-a and aCDOM(440) and their relative contribution to the diffuse PAR attenuation coefficient (Kd) was investigated at 21 sites (dry and wet seasons and two intermediate periods) and at monthly interval at 1 pelagic site. Higher values of ​​ Kd were observed during the mixing period, characterized by a higher concentration of tripton and Chl-a compared to the stratified rainy season. In the spatial sampling PAR attenuation was dominated by tripton absorption/scattering (average relative contribution of 79%), followed by Chl-a (average...
Tipo: Info:eu-repo/semantics/article Palavras-chave: CDOM; Chlorophyll-a; Kd partition; Light attenuation; Tripton.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000200469
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Effects of nutritional conditions on lipid production by cyanobacteria Anais da ABC (AABC)
CORDEIRO,RAQUEL S.; VAZ,IZABELA C.D.; MAGALHÃES,SÉRGIA M.S.; BARBOSA,FRANCISCO A.R..
ABSTRACT The present study evaluated the effects of the culturing media and the levels of nitrogen and phosphorus on the growth, biomass productivity and lipid production of four species of Microcystis (M. novacekii, M. aeruginosa, M panniformis and M. protocystis). The lipid extract was obtained by refluxing with dichloromethane (Soxhlet). The biomass and biomass productivity yields were maximized with ASM-1 medium treatment enriched with nitrogen and/or phosphorus (0.25-0.65 g/L and 25-50.7 mg/L d-1, respectively). The lipid extract yields from M. panniformis and M. novacekii were inversely correlated with the concentration of nitrogen and directly correlated with the concentration of phosphorus (35.8 % and 31.7 %). The lipid extract yield from M....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biodiesel; Culture media; Lipid extraction; Microcystis; Nitrogen and phosphorus deprivation and Stress..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502021
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