Consulta: creatorFacets:"Mostajir, B"
Registros recuperados: 2
Data/hora: 01/06/2024 01:29:01

Elemental composition of individual pico- and nano-sized marine detrital particles in the northwestern Mediterranean Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Mostajir, B; Fagerbakke, Km; Heldal, M; Thingstad, Tf; Rassoulzadegan, F.
The elemental composition of individual &lt; 10 mu m detrital particles from Mediterranean surface waters was analysed using a Transmission Electron Microscope (TEM) equipped with an energy dispersive X-Ray microanalyser. Results show that carbon and phosphorus content per detritus volume are much higher in pico-detrital particles &lt; 2 mu m (42 kg C m(-3) and 1 kg P m(-3)) than in 5-10 mu m detrital particles (20 kg C m-3 and 0.1 kg P m(-3)). The C:N:P atomic ratios for different sized fractions of the detrital particles were found to be 82:10:1 for &lt; 2 mu m particles, 120:29:1 for 2-5 mu m particles and 308:37:1 for 5-10 mu m particles. The average ratio for all size classes of detrital particles (&lt; 10 mu m) was 132:23:1. The differences in...
Tipo: Text
Palavras-chave: Détritus; Composition élémentaire; Microscope électronique à transmission; Rayons X; Méditerranée; Detritus; Elemental composition; TEM; X-ray; Mediterranean.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43661/43208.pdf

Pigment dynamics associated with the grazing of a ciliate and a flagellate feeding on a cyanobacterium
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Mostajir, B; Bustillos-guzman, J; Claustre, H; Rassoulzadegan, F.
The egestion of particulate material as well as pigment degradation during microzooplankton grazing on phytoplankton are poorly known processes. In an attempt to evaluate these processes, changes in pigment concentrations within various size fractions were monitored in batch cultures of an assemblage of a pelagic ciliate (Strombidium sulcatum) and a heterotrophic flagellate (Paraphysomonas sp.) feeding on a cyanobacterium (Synechococcus sp.) over a 10-day period. Chlorophyll a, carotenoids and phaeopigments were not found in the 0.1-0.7 mu m fraction while the pigments originally in the 0.7-3.0 mu m fraction (prey) were transferred into the &gt; 3.0 mu m size fraction (predator). During this transfer, the carotenoids (zeaxanthin and B-carotene) were not...
Tipo: Text
Palavras-chave: Pigment; Phéopigment; Broutage; Protozoaire; HPLC; Pigment; Phaeopigment; Grazing; Protozoa; HPLC.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43660/43209.pdf