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  • Condensed Matter: Electronic Properties, etc.  (8)
  • Biomass  (6)
  • Life Sciences (General)  (5)
  • 1
    Publication Date: 2021-05-19
    Description: في هذه الدراسة تمت متابعة الطحلب الأحمر Gelidium spinosum على سواحل المنستير منذ سبتمبر 2000 إلى أوت 2001 و أبرزت النتائج المتحّصل عليها أن الوزن الأقصى تم تسجيله في ماي وهو حوالي 37غ أما الطول الأقصى (11 صم) فقد تم الحصول عليه في شهر جوان . و أما الكتلة الحيوية الأعلى فقد تم التحصل عليها في شهر ماي (حوالي 7 كغ/م2) . أما نسبة الخصوبة فتراوحت بين 0 و 100% . كل هذه النتائج بينت لنا أن الطحلب Gelidium spinosum هو نبتة معمرة لكن حضورها متميز أكثر في الربيع والصيف .
    Description: La rhodophycée Gelidium spinosum (S.G. Gmelin) P.C. Silva (Rhodophycées (Gelidiales .Rhodophyta ) a été étudiée pendant une année, depuis septembre 2000 jusqu’à août 2001 , sur la côte de Monastir (Tunisie) . Les résultats globaux obtenus montrent que le poids humide moyen maximum (environ 37 g /individu) a été atteint en mai. La longueur maximale (environ 11 cm) a été enregistrée en juin. La biomasse maximale (environ 7000g poids humide/ m2) a été obtenue en mai. Quant à la fertilité, elle a varié entre 0%(Mai) et 100% (Septembre, Juin, Juillet et Août) .
    Description: The red algae Gelidium spinosum (Gelidiales .Rhodophyta ) was studied throughout a year, since September 2000 to August 2001,along Monastir coasts (East of Tunisia).Main results showed that the average of wet weight was obtained in May (37 g/ individual).In June, we have recorded the maximum of length (about 11 cm).Wet biomass has reached its maximum in May (7000g wet weight/ m-2 ).The fertility varied between 0 and 100%(September, June, July and August).
    Description: Published
    Keywords: Gelidiales Gelidium spinosum Rhodophyta ; Biomass ; Length ; Fertility ; Seaweeds ; Weight ; Biomass ; Fertility ; Length ; Seaweeds ; Weight
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 2
    Publication Date: 2021-05-19
    Description: L'etude d'une population naturelle de l'algue rouge Cystoclonium purpureum a montre que les thalles debutent leur croissonce au printemps pour atteindre leur developpement maximum ent ete. En automne, les algues commencent a disparaitre progressivement. En effet, le poids maximum des thalles est atteint en Juillet (No. 40g). Pendant la meme periode, la longueur des algues atteint son maximum (25,3 cm). Quand au diametre de la fronde, son evolution au cours du temps n'est pas claire. La biomass de Cystoclonium atteint egalement son apogee en Juillet (environ 35 g de MS/m2)
    Description: Study of Cystoclonium purpureum showed that thalli begin to grow in spring and reach highest developement in summer. In autumn, these algae disappear gradually. In fact, the maximum weight is obtained in July (No.40g). In the same period, algae length reach its maximum value, too (25,3cm). While frond diameter evolution isn't clear. Biomass of Cystoclonium reach its highest value in July, too (about 35g DM/m super(2))
    Description: Published
    Keywords: Biomasse ; Rhodophycée ; Growth ; Weight ; Length ; Population dynamics ; Seaweeds ; Biomass ; Seasonal variations ; Cystoclonium purpureum ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 20-36
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  • 3
    Publication Date: 2021-05-19
    Description: During the year of 1999, the red seaweed Gracilaria verrucosa (Hudson) Papenfuss (Rhodophyta, Gracilariales, Gracilariaceae), has been followed monthly in Bizerte lake (in the north of Tunisia). The parameters studied are: biomass, agar-yield, gel strength, gelling and melting temperatures. The results showed that the highest average of wet biomass is recorded in June (2500 g/m super(2)) and the lowest is obtained in October (130 g/m super(2)). The highest agar-yield is obtained in April (37,92 %) ; while the lowest is recorded in September (10,67 %). High and low gel strengths are obtained in May (410g /cm super(2)) and in December (125 g :cm super(2)), respectively. Gelling temperature varies between 31 degree C and 44~ 'C, while melting temperature varies between 79 degree C and 100 degree C
    Description: Published
    Keywords: Qualité ; Agar ; Yield ; Quality ; Seaweed products ; Biomass ; Gracilaria verrucosa ; Brackish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 127-136
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  • 4
    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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  • 5
    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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  • 6
    Publication Date: 2021-05-19
    Description: A population of the brown alga Padina pavonica has been studied in the locality of Cap Zebib (North of Tunisia) between September 2000 and August 2001. Abiotic factors (temperature ,salinity , oxygen ) and biotic ones (weight, height, diameter, biomass, and fertility) were carried out . The results showed that temperature varied between 12°C (February) and 24.5 °C (July). Salinity has recorded a little variation during the year .Oxygen ranged between 4.4 mg/l( March) and 10mg/l (November).Padina pavonica changed monthly . The weight ranged between 0.39g (February) and 18.8 g (August) . Minimum and maximum height were recorded respectively in January (2.07 cm) and September (7.3 cm) . Diameter varied between 1.32 cm (December) and 8.9 cm (August) . Concerning the biomass, we have recorded the highest one in June (3925g/m2) . This value let us estimate the quantity of Padina about 20 T . The fertility of Padina ranged between 0% (February ) and 100% (July and August) . These results show that Padina pavonica grows and reproduces particularly in spring and summer.
    Description: Une étude a été réalisée sur une population naturelle de l’algue brune Padina pavonica vivant à Cap Zebib , au Nord de la Tunisie . Les paramètres suivis sont de deux types, abiotiques et biotiques. Parmi le premier type , la température de l’eau , la salinité et l’oxygène dissous , ont été enregistrés mensuellement .Parmi le second , le poids des thalles, la hauteur, le diamètre , la biomasse et la fertilité de Padina , ont été suivis pendant la même période qui a duré une année de Septembre 2000 à Août 2001 .Les résultats enregistrés ont montré que la température varie de 12 °C (Février) à 24°C (Juillet) . La salinité n’a pas beaucoup changé au cours de l’année. L’oxygène dissous est compris entre 4.4 mg/l (Mars) et10 mg/l (Novembre). Le poids a évolué entre 0.39 g (Février) et 18.8 g (Août). Les hauteurs , maximale et minimale , ont été enregistrées respectivement en Janvier (2.07 cm) et Septembre (7.3 cm).Le diamètre a varié entre 1.32 cm (Février) et 8.9 cm (Août).La biomasse maximale a été obtenue en Juin (3925 g/m²).La quantité totale de Padina a été estimée à 20T ( poids frais). La fertilité est comprise entre 0% (février) et 100% (juillet et août). Ces résultats montrent que Padina pavonica se développe et se reproduit, essentiellement au printemps et en été.Mots clés : Algue brune, Padina pavonica , poids , hauteur , diamètre, fertilité, biomasse.
    Description: INSTM
    Description: Published
    Description: Algue brune, Poids-auteur-diamètre, Padina pavonica
    Keywords: Brown algae ; Algae ; Fertility ; Biomass ; Length-weight relationships
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
    Format: 309795 bytes
    Format: application/pdf
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  • 7
    Publication Date: 2013-02-14
    Description: Author(s): H. Gretarsson, J. P. Clancy, X. Liu, J. P. Hill, Emil Bozin, Yogesh Singh, S. Manni, P. Gegenwart, Jungho Kim, A. H. Said, D. Casa, T. Gog, M. H. Upton, Heung-Sik Kim, J. Yu, Vamshi M. Katukuri, L. Hozoi, Jeroen van den Brink, and Young-June Kim The electronic structure of the honeycomb lattice iridates Na 2 IrO 3 and Li 2 IrO 3 has been investigated using resonant inelastic x-ray scattering (RIXS). Crystal-field-split d - d excitations are resolved in the high-resolution RIXS spectra. In particular, the splitting due to noncubic crystal fields, de... [Phys. Rev. Lett. 110, 076402] Published Wed Feb 13, 2013
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 8
    Publication Date: 2012-09-15
    Description: Author(s): A. S. El-Said, R. A. Wilhelm, R. Heller, S. Facsko, C. Lemell, G. Wachter, J. Burgdörfer, R. Ritter, and F. Aumayr The impact of individual slow highly charged ions (HCI) on alkaline earth halide and alkali halide surfaces creates nano-scale surface modifications. For different materials and impact energies a wide variety of topographic alterations have been observed, ranging from regularly shaped pits to nanohi... [Phys. Rev. Lett. 109, 117602] Published Fri Sep 14, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 9
    Publication Date: 2011-09-02
    Description: Author(s): F. Weber, S. Rosenkranz, J.-P. Castellan, R. Osborn, R. Hott, R. Heid, K.-P. Bohnen, T. Egami, A. H. Said, and D. Reznik We report inelastic x-ray scattering measurements of the temperature dependence of phonon dispersion in the prototypical charge-density-wave (CDW) compound 2H-NbSe 2 . Surprisingly, acoustic phonons soften to zero frequency and become overdamped over an extended region around the CDW wave vector. This... [Phys. Rev. Lett. 107, 107403] Published Thu Sep 01, 2011
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 10
    Publication Date: 2012-01-12
    Description: Author(s): Elif Ertekin, Mark T. Winkler, Daniel Recht, Aurore J. Said, Michael J. Aziz, Tonio Buonassisi, and Jeffrey C. Grossman [Phys. Rev. Lett. 108, 026401] Published Wed Jan 11, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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