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Geochemical Record of the Cenomanian-Turonian Anoxic Event in Tunisia:Is it Correlative and Isochronous to the Biotic Signal?

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Acta Geologica Sinica(English Edition) 2011年第6期85卷 1310-1335页

作者： mohamed soua Dalila ZAGHBIB-TURKI Hela BEN JEMIA Jalel SMAOUI Amel BOUKADI Exploration and Studies Department Entreprise Tunisienne d'Activités Pétrolières(ETAP) Charguia Ⅱ2035 Tunisia Département of Geology Faculty of sciences of Tunis University of Tunis El Manar1068 Tunisia Petroleum Research and Development Center(CRDP-ETAP) Charguia Ⅱ 2035 Tunisia

In Tunisia, five Bahloul spaced sections, Bargou, Jerisa, Guern Halfaya, Kherij and Gafsa were analyzed for biostratigraphy （foraminifera and radiolarians） and major and trace elements. This high-resolution biostratigraphic and chemostratigraphic integrated analyses for the Late Cenomanian-Early Turonian Bahloul Formation provide new insight into the palaeoceanographic evolution of the southern Tethyan margin. Relative low abundance of related terrigenous Ti/Ai and K/ Al ratios and enrichment of some productivity proxies such as Ba, Cu, and Ni （organic matter related trace elements） suggests that the Bahloul, deposited during a relatively short period （0.5 Ma）, was of relatively elevated primary productivity and minimal detrital input. While higher D＊ values concurrent with lower Ti/AI ratios are interpreted as caused by enhanced fluvial material contribution, due to more humid climate during the OAE-2. Enhanced humidity triggered probably fluvial influxes, resulted in a sluggish water circulation and consequent anoxic/euxinic conditions favoring the preservation of organic matter at the bottom. Enrichments in redox-sensitive trace metals U, V, and Mo in the Bahloul Formation deposits and redox indices, such as V/（V＋Ni）, U/Th, V/Cr, and Ni/Co, indicate that oxygen-restricted conditions prevailed during the Late Cenomanian to earliest Turonian times and correlate well with relative abundances of some foraminiferal and radiolarian paleo- environmental relevant indicators. High Ba~ values and Uauth may indicate anoxic conditions at least at the water-sediment interface during the Bahloul Formation deposition and provide information about low to moderate sulfate-reduction reactions.

关键词： Bahloul Formation Foraminifera chemostratigraphy OAE-2

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Structural Characterization and Antioxidant Activity of Lignin Extracted from Ficus Carica L.

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Journal of Renewable Materials 2019年第4期7卷 345-354页

作者： Ibtissem Moussa Ramzi Khiari Ali Moussa Gérard Mortha mohamed Farouk Mhenni University of Monastir Faculty of SciencesUR13 ES 63-Research Unity of Applied Chemistry&EnvironmentAvenue of the environment5019 MonastirTunisia University of Monastir National Engineering School of MonastirStreet of Ibn El Jazzar5000 MonastirTunisia Higher Institute of Technological Studies of Ksar-Hellal Department of Textile-TunisiaAvenue of Hadj Ali Soua.5070 Ksar-HellalTunisia University of Grenoble Alpes CNRSGrenoble INPLGP2F-38000 GrenobleFrance

The most abundant phenolic biopolymer in the biosphere is the *** phenolic biopolymer commonly exists in combination with polysaccharides and other cell wall *** this study,the solvent system dioxane-water is used to extract lignin,which is considered as unaltered native *** dioxane lignin extracted from fig stems was characterized regarding to its structural feature,quantification of its functional groups,molecular weight,and evaluation of its thermal *** and molecular weight distribution of the studied lignin indicated that isolated lignin contained a low amount of sugar(c.a.19%)and had a high weight-average molecular weight(10068 ***-1).Lignin sample had approximately the same amounts of guaiacyl(G)and p-hydroxyphenyl(H)units with relatively fewer syringyl(S)*** isolated lignin revealed good antioxidant ***,it proved to have a high potential of application in new antioxidants formulations.

关键词： Ficus Carica L. lignin organosolv molecular weight NMR spectroscopy antioxidant activity

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Application of Prunus amygdalus By-products in Eco-friendly Dyeing of Textile Fabrics

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Journal of Renewable Materials 2018年第1期6卷 55-67页

作者： Ibtissem Moussa Noureddine Baaka Ramzi Khiari Ali Moussa Gérard Mortha mohamed Farouk Mhenni University of Monastir Faculty of SciencesUR13ES63-Research Unity of Applied Chemistry&Environment5000 MonastirTunisia Higher Institute of Technological Studies of Ksar Hellal Department of TextilesRue Hadj Ali Soua-B.P.n°68-5070 Ksar HellalTunisia Institute of Engineering University of Grenoble AlpesCNRSGrenoble INPLGP2F-38000 GrenobleFrance National Engineering School of Monastir 5019 MonastirTunisia

Natural dyes have become an interesting subject of study because of their better ecological properties in comparison to their synthetic *** article concerns the dyeing of wool,silk,and polyamide fabrics with natural dyes extracted from almond shells and *** developed method of dyeing by these extracts is interesting and very attractive for several reasons:firstly,the extracts used are the black liquor discharged from the industries of delignification,which is a chemical process for removing lignin from agricultural wastes to produce a cellulosic fiber;(ii)these natural dyes are renewable and available in large quantities;(iii)this method is economical;and(iv)lastly,the dyeing performances of the obtained dyed textiles are very *** color of each dyed material was investigated in terms of the CIELAB coordinates and their fastness properties measured by washing,rubbing,and light.

关键词： Almond shell almond stem fastness properties natural dyes residual lignin

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