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  • 1
    Electronic Resource
    Electronic Resource
    Radical polymerization and copolymerization behavior of 1-cyanoethanoyl-4-acryloylthiosemicarbzide (2000)
    Springer
    Journal of polymer research 7 (2000), S. 229-235 
    Details
    ISSN: 1572-8935
    Keywords: Functional monomers ; Polymerization ; Copolymerization ; Kinetic studies ; Reactivity ratios
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract 1-Cyanoethanoyl-4-acryloylthiosemicarbazide (CEATS) was synthesized for the first time as a new chelating monomer. Its structure was confirmed by both elemental and spectral analyses. Radical polymerization and copolymerization of CEATS was been carried out in dimethylformamide (DMF) in the presence of azobisisobutyronitrile (AIBN) as an initiator. Kinetic studies for the polymerization behavior of CEATS were performed. The complex formation of the CEATS monomer and polymer (PCEATS) with Cu II cation was investigated and its stability constant determined. The rate of copolymerization of CEATS with some conventional monomers, namely vinyl acetate, methyl methacrylate and acrylonitrile, was measured as a function of the mole fraction of the monomers. The reactivity ratios (r1, r2) for the various copolymer systems investigated together with the Q and e values of the CEATS monomer were determined. Moreover, the thermal gravimetric analysis of the prepared polymers and their copolymers with acrylonitrile were also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0124-x
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  • 2
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    Etude d'une population naturelle de la rhodophycée Cystoclonium purpureum. (2016)
    Details
    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
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    Culture du phytoplancton en petits volumes. (2016)
    Details
    Publication Date: 2021-05-19
    Description: Dans ce travail, realise a l'ecloserie de l'INSTOP a Ghar El Melh, on se propose d'exposer les resultats des cultures du phytoplancton dans une salle climatisee en petits volumes. Par opposition aux cultures en grandes volumes soumises aux aleas climatiques, cette technique permet la maitrise des parametres physico-chimiques (lumiere, temperature, sels minerauxa) et l'obtention de hautes densites algales dans un laps de temps assez court. (DBO)
    Description: In this work, conducted in the INSTOP hatchery at Ghar El Melh, the results are given of the culture of small volumes of phytoplankton in an air-conditioned room. As opposed to culture of large volumes, subject to climatic variations, this technique allows the control of physico-chemical parameters (light, temperature, mineral salts) and the production of high algal densities in a short lapse of time.
    Description: Published
    Keywords: Culture phytoplancton ; Microalgues ; Hatcheries ; Phytoplankton culture ; Marine aquaculture ; Aquaculture techniques ; Aquaculture systems ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 30-40
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  • 4
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    Etude de la variabilité des spores de Gracilaria verrucosa (Hudson) Papenfuss. (2016)
    Details
    Publication Date: 2021-05-19
    Description: L'etude de la viabilite des spores de l'algue rouge Gracilaria verrucosa a montre que le taux de survie diminue de 100% a 8% pour les tetraspores et a 4% pour les carpospores apres trois semaines de culture.
    Description: Study of Gracilaria verrucosa spores growth showed that survival rate decreases from 100% to 8% for tetraspores and to 4% for carpospores after three weeks of culture
    Description: Published
    Keywords: Algue rouge ; Growth ; Variability ; Survival ; Seaweed culture ; Spores ; Gracilaria verrucosa ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 54-58
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  • 5
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    Effets de la température et de la lumière sur la croissance des tétraspores de la rhodophycée Gracilaria verrucosa (Hudson) Papenfuss. (2016)
    Details
    Publication Date: 2021-05-19
    Description: L'etude de l'influence de la temperature et de la lumiere sur la croissance des tetraspores Gracilaria verrucosa a montre que l'intensite lumineuse optimale est comprise entre 85 et 110 Kappa E/m super(2)/s a 20 degree C et entre 80 et 100 Kappa E/ m super(2)/s a 25 degree C
    Description: Study of temperature and light influence on Gacilaria verrucosa tetraspores growth showed that optimal light intensity is situated between 85 and 110 Kappa E/m super(2)/s at 2 degree C and between 80 and 100 Kappa E/m super(2)/s at 25 degree C.
    Description: Published
    Keywords: Croissance ; Tétraspores ; Rhodophycée ; Temperature effects ; Growth ; Light intensity ; Seaweeds ; Gracilaria verrucosa ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 62-79
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  • 6
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    Cartographie des peuplements de la macroalgue Gracilaria (Gigartinales, Gracilaires) dans le lac Nord de Tunis. (2016)
    Details
    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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  • 7
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    The ocean sampling day consortium (2015)
    BioMed Central
    Details
    Publication Date: 2022-10-18
    Description: © The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in GigaScience 4 (2015): 27, doi:10.1186/s13742-015-0066-5.
    Description: Ocean Sampling Day was initiated by the EU-funded Micro B3 (Marine Microbial Biodiversity, Bioinformatics, Biotechnology) project to obtain a snapshot of the marine microbial biodiversity and function of the world’s oceans. It is a simultaneous global mega-sequencing campaign aiming to generate the largest standardized microbial data set in a single day. This will be achievable only through the coordinated efforts of an Ocean Sampling Day Consortium, supportive partnerships and networks between sites. This commentary outlines the establishment, function and aims of the Consortium and describes our vision for a sustainable study of marine microbial communities and their embedded functional traits.
    Description: This work was supported by the Micro B3 project, which is funded from the European Union’s Seventh Framework Programme (FP7; Joint Call OCEAN.2011‐2: Marine microbial diversity – new insights into marine ecosystems functioning and its biotechnological potential) under the grant agreement no 287589.
    Keywords: Ocean sampling day ; OSD ; Biodiversity ; Genomics ; Health index ; Bacteria ; Microorganism ; Metagenomics ; Marine ; Micro B3 ; Standards
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 8
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    Parallel characterization of anaerobic toluene- and ethylbenzene-degrading microbial consortia by PCR-denaturing gradient gel electrophoresis, RNA-DNA membrane hybridization, and DNA microarray technology (2002)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A mesophilic toluene-degrading consortium (TDC) and an ethylbenzene-degrading consortium (EDC) were established under sulfate-reducing conditions. These consortia were first characterized by denaturing gradient gel electrophoresis (DGGE) fingerprinting of PCR-amplified 16S rRNA gene fragments, followed by sequencing. The sequences of the major bands (T-1 and E-2) belonging to TDC and EDC, respectively, were affiliated with the family Desulfobacteriaceae. Another major band from EDC (E-1) was related to an uncultured non-sulfate-reducing soil bacterium. Oligonucleotide probes specific for the 16S rRNAs of target organisms corresponding to T-1, E-1, and E-2 were designed, and hybridization conditions were optimized for two analytical formats, membrane and DNA microarray hybridization. Both formats were used to characterize the TDC and EDC, and the results of both were consistent with DGGE analysis. In order to assess the utility of the microarray format for analysis of environmental samples, oil-contaminated sediments from the coast of Kuwait were analyzed. The DNA microarray successfully detected bacterial nucleic acids from these samples, but probes targeting specific groups of sulfate-reducing bacteria did not give positive signals. The results of this study demonstrate the limitations and the potential utility of DNA microarrays for microbial community analysis.
    Keywords: Life Sciences (General)
    Type: Applied and environmental microbiology (ISSN 0099-2240); Volume 68; 7; 3215-25
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    NASA TECHNICAL REPORTS
  • 9
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    Direct profiling of environmental microbial populations by thermal dissociation analysis of native rRNAs hybridized to oligonucleotide microarrays (2003)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Oligonucleotide microarrays were used to profile directly extracted rRNA from environmental microbial populations without PCR amplification. In our initial inspection of two distinct estuarine study sites, the hybridization patterns were reproducible and varied between estuarine sediments of differing salinities. The determination of a thermal dissociation curve (i.e., melting profile) for each probe-target duplex provided information on hybridization specificity, which is essential for confirming adequate discrimination between target and nontarget sequences.
    Keywords: Life Sciences (General)
    Type: Applied and environmental microbiology (ISSN 0099-2240); Volume 69; 4; 2377-82
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    NASA TECHNICAL REPORTS
  • 10
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    Optimization of single-base-pair mismatch discrimination in oligonucleotide microarrays (2003)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The discrimination between perfect-match and single-base-pair-mismatched nucleic acid duplexes was investigated by using oligonucleotide DNA microarrays and nonequilibrium dissociation rates (melting profiles). DNA and RNA versions of two synthetic targets corresponding to the 16S rRNA sequences of Staphylococcus epidermidis (38 nucleotides) and Nitrosomonas eutropha (39 nucleotides) were hybridized to perfect-match probes (18-mer and 19-mer) and to a set of probes having all possible single-base-pair mismatches. The melting profiles of all probe-target duplexes were determined in parallel by using an imposed temperature step gradient. We derived an optimum wash temperature for each probe and target by using a simple formula to calculate a discrimination index for each temperature of the step gradient. This optimum corresponded to the output of an independent analysis using a customized neural network program. These results together provide an experimental and analytical framework for optimizing mismatch discrimination among all probes on a DNA microarray.
    Keywords: Life Sciences (General)
    Type: Applied and environmental microbiology (ISSN 0099-2240); Volume 69; 5; 2848-56
    Format: text
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