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  • 1
    Publication Date: 2021-05-19
    Description: L’étude de l’émission de carpospores de deux espèces de gracilaires : Gracilaria gracilis et de Gracilaria bursa-pastoris a été réalisée sur des fragments de thalle femelle à cystocarpes. Ces fragments ont été prélevés à différents niveaux de la plante mère (apex, parties intermédiaires et basales) reflétant un degré plus ou moins avancé de l’âge de la plante femelle à cystocarpes. Les différents fragments ont été exposés à des stress hydriques, thermiques et lumineux (intensité lumineuse et photopériode).Les résultats globaux ont montré que le nombre de carpospores émises sous une photopériode (12/12) est généralement supérieur à celui enregistré sous une plus courte photopériode (8/16), quelle que soit l’intensité lumineuse et la partie du thalle dont les fragments sont issus notamment chez la première espèce.
    Description: Study of carpospore shedding of Gracilaria gracilis and Gracilaria bursa-pastoris was carried out on cystocarpic female gametophyte fragments. These fragments were picked up at different levels (apices; medium parties and basal ones), which reflect the degree of the age of the mother plant. The fragments were exposed to different stress (hydric, thermic and luminous: intensity and photoperiod). The global results showed that the maximum of spore release was generally obtained for 12/12 photoperiod whatever the origin of the fragments on the plant and the intensity of the irradiance and this for especially the first species.
    Description: Published
    Description: carpospores; Light.
    Keywords: Gracilaria ; Sporulation
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 2
    Publication Date: 2021-05-19
    Description: L’estimation de la biomasse de la macroalgue Gracilaria dans le lac nord de Tunis a été réalisée au cours de Juin-Juillet 1996 à partir de 38 stations d’échantillonnage couvrant tous les types de recouvrement de l’espèce. Il en ressort que la biomasse en poids humide est de 191 g/m2 (28 g/m2 en poids sec) et engendre un potentiel total estimé à 508 tonnes, soit 74 tonnes en poids sec (la matière sèche représentant en moyenne 14,5 % de la matière humide). Eu égard à la quantité de Gracilaria disponible à l’état naturel, la valorisation de cette espèce au niveau de ce site pourrait demander le recours à la phycoculture.
    Description: The red seaweed Gracilaria biomass in the Tunis north lake (Tunisia) was estimated between June and July 1996 with reference to different stations. This biomass represent 191 g/m super(2) (wet weight) and 28 g/m super(2) (dry weight). so the total quantity is estimated to 508 t in wet and 74 in dry (the average of dry material represent in general 14,5 % of the humid materiel). Because of its low natural total production, the development of Gracilaria seaweed in this site need culture processing.
    Description: Published
    Keywords: Macroalgues ; Phycoculture ; Potential resources ; Aquaculture development ; Marine aquaculture ; Seaweed culture ; Coastal lagoons ; Biomass ; Seaweeds ; Gracilaria ; Brackish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: 15-27
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  • 3
    Publication Date: 2021-05-19
    Description: The prospecting study of the Gracilaria in Bizerte lake (Tunisia) between the river bank and a depth of 3 m and concerning 1300ha shows that the macro seaweeds cover a surface of 348 ha and give a wet total biomass of 4775 (that is 573 t dry weight) with reference to average density of 1,7 kg/m super(2). These species are principally present as band between Menzel Abderrahman and Oued Gueniche (Tunisia)
    Description: Published
    Keywords: Macroalgues ; Fishery surveys ; Botanical resources ; Seaweed harvesting ; Biomass ; Gracilaria ; Brackish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 17-34
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  • 4
    Publication Date: 2021-05-19
    Description: Ce travail concerne la repatition spatiale de la macroalgue Gracilaria dans le lac nord de Tunis et la determination des surfaces d'extension correspondant aux differents types de recouvrement de cette espece, durant les moins de Juin-Juillet 1996. Les peuplements de Gracilaria couvrent 265 ha soit 10% seulement de la surface totale du lac et se presentent sous forme de ceintures dans les profondeurs limitrophes (59,5%) ainsi qu'a l'interieur du lac (24%) et au voisinage de la digue centrale (17%).
    Description: This work concerns the red macro seaweed Gracilaria distribution in the Tunis north lake and the surface corresponding to each type recovering during June and July 1996. The Gracilaria covers 265 ha of the lake which correspond to 10% of it's total surface. 59,5% is surrounding the water plan in shallow water, 24% inside and 17% near the central dyke
    Description: Published
    Keywords: Macroalgues ; Cartographie ; Geographical distribution ; Recovery ; Coastal lagoons ; Seaweeds ; Gracilaria ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp 55-72
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  • 5
    Publication Date: 2018-07-19
    Description: Author(s): H. Miao, T. T. Zhang, L. Wang, D. Meyers, A. H. Said, Y. L. Wang, Y. G. Shi, H. M. Weng, Z. Fang, and M. P. M. Dean Condensed matter systems have now become a fertile ground to discover emerging topological quasiparticles with symmetry protected modes. While many studies have focused on fermionic excitations, the same conceptual framework can also be applied to bosons yielding new types of topological states. Mot... [Phys. Rev. Lett. 121, 035302] Published Wed Jul 18, 2018
    Keywords: Condensed Matter: Structure, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 6
    Publication Date: 2016-09-14
    Description: Author(s): Ayman S. El-Said, Richard A. Wilhelm, Rene Heller, Michael Sorokin, Stefan Facsko, and Friedrich Aumayr Slow highly charged ions have been utilized recently for the creation of monotype surface nanostructures (craters, calderas, or hillocks) in different materials. In the present study, we report on the ability of slow highly charged xenon ions ( Xe 129 Q + ) to form three different types of nanostructures… [Phys. Rev. Lett. 117, 126101] Published Tue Sep 13, 2016
    Keywords: Condensed Matter: Structure, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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