2 edition of Further studies on the kinetics of heavy metal uptake by lichens found in the catalog.
Further studies on the kinetics of heavy metal uptake by lichens
William G. Mitchell
|Statement||William G. Mitchell.|
|The Physical Object|
|Pagination||viii, 38 l. :|
|Number of Pages||38|
For the removal of heavy metals from the food cycle, natural processes can be used. The bio-molecules that bind metals in natural systems can make certain types of biomass suitable for metal sequestration in industrial biosorption processes which are described in this chapter. Biosorption can serve as a tool for the recovery of precious metals and the elimination of toxic :// The existing mathematical modeling approaches used for heavy metal biosorption were overviewed. Several isotherms, obtained in batch conditions, are available for modeling biosorption equilibria and kinetics. In continuous systems, most of the models are used to predict the breakthrough ://
Foulkes EC (a) Further findings on the mechanism of cadmium uptake by intestinal mucosal cells. Toxicology – Google Scholar Foulkes EC (b) Nature of Cd and Hg effects on epithelial amino acid transport in vivo and role of :// A new nanocomposite consisting of activated carbon (AC) from the Cortaderia selloana flower and copper-based metal-organic framework (HKUST-1) was synthesized through a single-step solvothermal method and applied for the removal of lead ions from aqueous solution through adsorption. The nanocomposite, AC/HKUST-1, was characterized by Scanning Electron Microscopy (SEM), X-ray
The equilibrium uptake of nickel followed first-order Langmuir kinetics in the case of PFB1 and second-order Langmuir kinetics in the case of PFB2. Studies on simultaneous removal of cobalt and nickel indicated that the extent of more» secondary interactions between cobalt and nickel can be quantified by the change in Langmuir equilibrium Heavy metal contamination has been widely studied in coastal areas around the world. However, integrative studies of heavy metals pollution by monitoring and characterizing sediments, organisms, and biomarkers as well as their holistic interactions are ://
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Biochemical studies on this enzyme were complemented with attempts to sequence its gene. A biochemical profile of periplasmic AP suggested that the enzyme was not very functional at pH 4, the pH at which the metal ion uptake studies were carried out.
Only a partial sequence of the gene for the enzyme was :// Y. Sa, T. Kutsal, An overview of the studies about heavy metal adsorption process by microorganisms on the lab. scale in Turkey, Biohydrometallurgy and the Environment Toward the Mining of the 21st Century - Proceedings of the International Biohydrometallurgy Symposium, The equilibrium uptake of nickel followed first-order Langmuir kinetics in the case of PFB1 and second-order Langmuir kinetics in the case of PFB2.
Studies on simultaneous removal of cobalt and nickel indicated that the extent of secondary interactions between cobalt and nickel can be quantified by the change in Langmuir equilibrium constants The metal concentrations in the plants at the end of the experiment are shown in Table 2.
Elodea had, with a few exceptions in the case of Zn, higher concentrations of heavy metals than did Potamogeton in both treated and control plants.
Except for Cu in Elodea at 5 °C and 5‰ salinity, controls had lower metal concentrations than did the treated :// Further research is needed to find out the variations in metal uptake by different vegetable species, and the site-specific risk assessment guidelines to highlight and to minimize the potential health risks of ingesting vegetables containing high levels of heavy :// We have developed a fluorescence resonance energy transfer ([FRET])-based heavy metal biosensor for the quantification of bioavailable free heavy metals in the cytoplasm of the microalga Chlamydomonas reinhardtii.
The biosensor is composed of an end-to-end fusion of cyan fluorescent protein ([CFP]), chicken metallothionein II (MT-II), and yellow fluorescent protein ([YFP]) At pH values lower than 3, the uptake capacity of microalgae is lower, mainly because of the competition between protons and heavy metal ions for the binding sites of biosorbent (Priyadarshani et al.,Zhao et al., ).
Above pHthe heavy metal ions tend to precipitate as hydroxides, and only a low amount of heavy metals remain in Heavy metals are group of subset elements that show metallic properties whose atomic density is greater than 5 g/cm ().They are naturally occurring in soils, water, and rocks ().Heavy metals are placed at a primary position among the xenobiotics whose main source is biogenic and anthropogenic activities as shown in Fig.
(Ezzouhri et al.,Mohammed et al., ). ENVIRONMENTAL RESEA () Metabolism of Toxic Heavy Metals in Growing Organisms: A Review SLOBODAN JUGO Institute for Medical Research, Yugoslav Academy of Sciences and Arts, Department for Mineral Metabolism, M.
PijadeZagrebYugoslavia Received October The metabolism of nonessential heavy metals in the growing organism is 4. Biochemical Mechanism of Heavy Metal Uptake and Accumulation in Plants Arsenic.
This metalloid is of immense environmental apprehension because of its lethal effect and abundance, in countries such as China, Bangladesh, Hungary, India, and others.
Heavy metal concentration is higher in ground water and the soil surface (Chen et al., ). 1. Introduction. Rapid urbanization and industrial development and the intensification of agriculture not only support the local and national economy but also instigate many environmental pollution problems [1,2].Heavy metal (HM) pollution mainly comes from the mining and smelting of metals, from electroplating, and from other industrial processes [3,4].
The environment and its compartments have been severely polluted by heavy metals. This has compromised the ability of the environment to foster life and render its intrinsic values.
Heavy metals are known to be naturally occurring compounds, but anthropogenic activities introduce them in large quantities in different environmental :// Influence of Fe Deficiency on Concentration-Dependent Kinetics of Cd and 65 Zn Influx.
The concentration-dependent kinetics of Cd and 65 Zn influx showed a saturable (hyperbolic) component and a linear component for both ecotypes (Fig. 2, A and C).To mathematically resolve these curves, we applied a Michaelis-Menten model combined with a linear component using SigmaPlot (SPSS, Inc Data on reaction kinetics and thermodynamics of the sorption process are reviewed.
The technology of biosorption and experiences with a pretreatment of the biomass to improve biosorption are further topics. Examples from the literature of heavy metal removal by fungal biomass are :// Sorption studies supported the hypothesis that the two latter algae gained their relative resistance to heavy metal ions from competition for uptake sites by the zinc and cadmium species involved Kinetics of High Affinity H 2 AsO 4 − and H 2 PO 4 − Uptake.
In H 2 PO 4 −-deficient tissue the rate of H 2 AsO 4 − and H 2 PO 4 − uptake was dependent on concentration, and the uptake of both ions displayed saturation kinetics (Figs. (Figs.2 2 and and3). 3).Single Michaelis-Menten functions were fitted to the data, representing the high affinity uptake carrier, which would Heavy Metal Electron Spin Resonance Humic Acid Soil Solution Electron Spin Resonance Spectrum These keywords were added by machine and not by the authors.
This process is experimental and the keywords may be updated as the learning algorithm :// Metal deposition, uptake and its further translocation into different plant parts is governed by various factors likemorphological characteristics of leaf, speciation of heavy metal The rate of uptake, the effects of carrier ions, temperature, light intensity and dinitrophenol (DNP) upon the uptake of zinc (using zinc as tracer) by Fontinalis antipyretica were :// Biosorption isotherm curves, derived from equilibrium batch sorption experiments, are used in the evaluation of metal uptake by different biosorbents.
Further studies are focusing on the. Uptake of phosphate from tanks is an ATP-dependent process. The kinetics of phosphorus uptake suggest that epiphytes possess effective phosphate transporters. The K m value of 105 µ m determined for leaves of the bromeliad Aechmea fasciata is comparable with values obtained for the high affinity phosphate transporters in roots of terrestrial Uptake kinetics is fast (equilibrium ≈ 60–90 min).
Sorption isotherm (fitted by the Langmuir equation) shows remarkable sorption capacity (≈ mg Sr g −1). Sr(II) is desorbed using M HCl/ M CaCl 2 solution; sorbent recycling over five cycles shows high stability in terms of Full Article. CELLULOSIC SUBSTRATES FOR REMOVAL OF POLLUTANTS FROM AQUEOUS SYSTEMS: A REVIEW.
1. METALS. Martin A. Hubbe, a * Syed Hadi Hasan, b and Joel J. Ducoste c Recent years have seen explosive growth in research concerning the use of cellulosic materials, either in their as-recieved state or as modified products, for the removal of heavy metal ions