The solid-phase synthesis of 2-5-linked oligoriboadenylates containing 8-bromoadenine

Lesiak, Krystyna; Uznański, Bogdan; Torrence, Paul F.

doi:10.1007/bf02787839

Cited by 8 publications

References 39 publications

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Biosorption, Metals

Naja¹,

Murphy²,

Volesky³

2010

Encyclopedia of Industrial Biotechnology

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Biosorption is a property of certain types of inactive, dead, microbial biomass to bind certain chemical components and thus also to concentrate heavy metals from even very dilute aqueous solutions. Certain types of biomass exhibit this property, acting just as chemical substances, as ion exchangers of biological origin. It is particularly the cell wall structure of certain algae, fungi and bacteria which was found responsible for this phenomenon. Some biomass types, serving as a basis for metal biosorption processes, can accumulate in excess of 25% of their dry weight in deposited heavy metals such as Pb, Cd, U, Cu, Zn, even Cr and others. Research on biosorption is revealing that it is sometimes a complex phenomenon where the metallic species could be deposited in the solid biosorbent through different sorption processes of ion exchange, complexation, chelation, microprecipitation, etc. A whole new family of suitably “formulated” biosorbents can be used in the process of metal removal and detoxification of industrial metal‐bearing effluents. The sorption packed‐column configuration is the most effective mode of application for the purpose. Recovery of the deposited metals from saturated biosorbent can be accomplished because they can often be easily released from the biosorbent in a concentrated wash solution which also regenerates the biosorbent for subsequent multiple reuse. This and extremely low cost of biosorbents makes the process highly economical and competitive particularly for environmental applications in detoxifying industrial metal‐bearing effluents.

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Biosorption, Metals

Naja¹,

Murphy²,

Volesky³

2010

Encyclopedia of Industrial Biotechnology

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Kinetic and equilibrium studies on bioadsorption of copper and lead by water hyacinth (Eichhornia crassipes) plant powder

Hazarika,

Shah,

Baruah

et al. 2023

Vietnam Journal of Chemistry

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Common water hyacinth plant (Eichhornia crassipes) found in various water bodies in Assam, India, was used as bioadsorbent for removal of toxic metals (Cu and Pb) from synthetic medium. The functional groups present in the bioadsorbent, water hyacinth plant powder (WPP) were determined by using Fourier transform infra red spectroscopy (FTIR) and surface topography by scanning electron microscopy (SEM) technique. The specific surface area of WPP was also determined. The optimum adsorption properties of WPP was determined by considering pH, agitation time, metal concentration, temperature and the amount of adsorbent. The adsorbent showed good adsorption of toxic metal, Cu and Pb from synthetic medium. Water hyacinth plant was used to treat ten synthetic mediums containing 40, 50, 60 70 and 80 mgL‐1 of the two heavy metals, Cu and Pb. From the batch study, it was observed that the adsorption mechanism for the studied metals follow the 2nd order kinetics and the isotherm study showed that Langmuir model is suitable for explaining the adsorption equilibrium data for bioadsorption of Cu2+ and Pb2+ ions on WPP. For Cu(II) adsorption on WPP, the maximum adsorption was observed at pH 7 while for Pb(II), the maximum adsorption was observed at pH 5.

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Antifouling chromanols isolated from brown alga Sargassum horneri

Cho

2012

J Appl Phycol

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Biofouling in aquatic environments have a wide range of detrimental effects on man-made structures and cause economic loss. Current antifouling compounds including Diuron, dichlorofluanid, and Irgarol are toxic and can accumulate in marine environments. Thus, effective and environmentally friendly antifoulants are needed. Six structurally similar compounds were isolated from the brown alga, Sargassum horneri, based on bioactivity-guided isolation by reversed-phased liquid flash chromatography and highperformance liquid chromatography. Six chemical constituents possessing antifouling activities were identified as chromanols consisting of polyprenyl chain by nuclear magnetic resonance and mass spectroscopy. Antifouling activities of these six compounds were determined against representative fouling organisms including a hard fouling organism the mussel Mytilus edulis, a soft fouling macroalga Ulva pertusa, the biofouling diatom Navicula annexa, and the biofouling bacteria Pseudomonas aeruginosa KNP-3 and Alteromonas sp. KNS-8. The compounds could inhibit larvae settlement of mussel M. edulis with an EC 50 of 0.11-3.34 μg mL −1 , spore settlement of U. pertusa zoospores (EC 50 of 0.01-0.43 μg mL −1 ), and the diatom N. annexa (EC 50 of 0.008-0.19 μg mL −1 ). The two biofouling bacteria were sensitive to the tested compounds (minimum inhibitory concentration of 1.68-36.8 and 1.02-30.4 μg mL −1 , respectively). From toxicity tests on juvenile Sebastes schlegelii fish, brine shrimp Artemia salina, and microalga Tetraselmis suecica, S3 had the lowest LC 50 values of 60.2, 108, and 6.7 μg mL −1 and exhibited no observed effect concentration at 24.5, 41.6, and 3.1 μg mL −1 for these three tested marine organisms, respectively.

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The solid-phase synthesis of 2-5-linked oligoriboadenylates containing 8-bromoadenine

Cited by 8 publications

References 39 publications

Biosorption, Metals

Biosorption, Metals

Kinetic and equilibrium studies on bioadsorption of copper and lead by water hyacinth (Eichhornia crassipes) plant powder

Antifouling chromanols isolated from brown alga Sargassum horneri

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