Title: Sciencepaper Online

Title: Sciencepaper Online

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? Shi, B. and Liao, X.P. (2005), Preparation mechanism of collagen fiber immobilized tannins and their adsorption behaviors for heavy metal ions. Sciencepaper Online, (http://www.paper.edu.cn).

Full Text: S\Sci Onl 2005 Shi.pdf

Abstract: As a kind of novel adsorption material, collagen fiber immobilized tannin has promised to be an effective adsorbent for removing heavy metal ions from water. In this paper, the mechanism of preparing collagen fiber immobilized tannins was explored and their adsorption behaviors for heavy metal ions were extensively investigated. The results indicated that the formation of the covalent linkage of aldehyde between the nucleophilic sites of tannins and the amino groups of collagen side chains is the reason for solvent extraction resistance and high thermal stability of immobilized tannins. This observation is different from the previous elucidation of collagen-tannin-aldehyde interaction and implies that only condensed tannins, which have rich nucleophilic sites, can be immobilized onto collagen fiber by the described approach. The immobilized condensed tannins were effective in adsorbing Au(III), Th(IV), Cu(II), Pb(II), Cd(II) and Hg(II) from water. For some metal ions, like Au(III) and Hg(II), their adsorption capacities on collagen fiber immobilized tannins were very high, reaching 1500 mgAu/g and 198mgHg/g respectively under proper conditions. The adsorption isotherms of Cu(II), Pb(II), Cd(II) and Hg(II) could be well described by the Freundlich model. But, for the adsorption of Au(III) and Th(IV), the adsorption isotherms could be well described by the Langmuir model. The adsorption kinetics data of Cu(II), Au(III), Hg(II) and Th(IV) could be well fitted by the pseuo-second-order model whilst for that of Pb(II) and Cd(II), no suitable model had been found. These facts suggest that different adsorption mechanisms might be involved in the adsorption processes of these metal ions. The immobilized tannins presented excellent column adsorption properties for metal ions, and the adsorption column could be easily regenerated by using diluted acid solution except for the column adsorbing Au(III).

Keywords: Vegetable Tannin, Collagen Fiber, Immobilized Tannin, Preparation Mechanism, Heavy

? Zhao, G.Y., Xie, L. and Zhou, Q. (2007), Adsorption of phosphorus from aqueous solution on blast furnace slags. Sciencepaper Online, (http://www.paper.edu.cn).

Full Text: 2007\Sci Onl 2007 Zhao.pdf

Abstract: This paper focus on the adsorption of phosphorus onto blast furnace slags. Its equilibrium isotherm and kinetic model were investigated by using different models. The Langmuir, Freundlich and Temkin isotherms were applied to describe the experimental isotherm data and the results showed that the Langmuir isotherm was the best to characterize the phosphorus adsorption behavior on the blast furnace slags with the maximum adsorption capacity m Q of 1341.6mg/kg. The kinetics studies at different initial phosphorus concentrations showed that greatest amount of phosphorus adsorption were completed during the first 10h. Although the process of phosphorus adsorption as a function of time can be suitably described by first-order and pseudo second-order kinetics, the pseudo second-order kinetics are proved to be the best with the similar qe with the experimental data.

Keywords: Phosphorus Adsorption, Isotherms, Kinetics, Blast Furnace Slags

Title: Sciences des Aliments

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ISSN: 0240-8813

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? Talla, A., Jannot, Y., Kapseu, C. and Nganhou, J. (2001), Experimental study and modelling of the kinetics of drying of tropical fruits: Application to banana and to mango. Sciences des Aliments, 21 (5), 499-518.

Abstract: Up till now, there is very little information on the drying of tropical fruits, in particular of bananas and mangoes. Yet this method of conservation whereby only 60% loss of foodstuff is recorded after harvest, is the most economical to undeveloped and developing nations. Using the dynamic gravimetric method, the sorption and desorption isotherms at 40 and 50degreesC for bananas and 50degreesC for mangoes were experimentally determined. These curves were modelled following a semi-empirical correlation proposed by HENDERSON. The advantage of this correlation method is that it takes into account the influence of temperature. The insensitive effect of temperature ranges of about 10degreesC, as is the case with bananas, was highlighted. Hysteresis between the sorption and desorption, with a maximum amplitude of 4% for bananas and 5% for mangoes, was observed. Consequently, experimental results of drying by forced convection of products tested in thin slices (10 mm thickness for mangoes and thickness of less than 15 mm for bananas) were obtained, using well controlled aeraulic and thermal conditions of air duct (40, 50 and 60degreesC for the temperatures, 0.5, 1.0 and 2.0 m^-1 for flow rates). A characteristic curve of drying is built for each product, independently of the different aerothermic conditions. This simplified method makes it possible to simulate the experimental kinetics satisfactorily. One of the peculiarities of our work is to identify a critical moisture which is different from the initial moisture content.

Keywords: Banana, Mango, Sorption Isotherms, Kinetic of Drying, Modelling

Title: Science’s STKE

Previous Issues of Science Signaling

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Full Journal Title: Science’s STKE

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? Vogel, S.S., Thaler, C. and Koushik, S.V. (2006), Fanciful FRET. Science’s STKE, 331, re2.

Full Text: 2006\Sci STK331, 2.pdf

Abstract: The validity of experiments based on Forster resonance energy transfer (FRET), an imaging technique widely used to measure protein-protein interactions in living cells, critically depends on the accurate and precise measurement of FRET efficiency. The use of FRET standards to determine FRET efficiency, and a consideration of such factors as how the abundance of FRET acceptors and the stoichiometry of donors and acceptors in a molecular complex can affect measured FRET efficiency, will enhance the usefulness with which FRET experiments can be interpreted.

Keywords: Efficiency, Energy, Experiments, Living, Measurement, Standards, Validity

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