Wyniki wyszukiwania - AGRO

1

Fibronectin adsorption and cell adhesion

100%

Kowalczynska H. M., Nowak-Wyrzykowska M., Dobkowski J., Kolos R., Kaminski J., Makowska-Cynka A., Marciniak E.

Cellular and Molecular Biology Letters

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2002

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tom 07

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nr Suppl.

2

Investigations on adsorption of aromatic amines and attempt to confirm the Polanyi's theory

100%

Eppinger P., Straczynska-Knysak M., Worch E.

Natural Sciences

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2000

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tom 04

3

Molecular simulation of adsorption from dilute solutions

100%

Billes W., Tscheliessnig R., Fischer J.

Acta Biochimica Polonica

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2005

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tom 52

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nr 3

Adsorption of biomolecules on surfaces is a perennial and general challenge relevant to many fields in biotechnology. A change of the Helmholtz free energy ΔA takes place when a molecule becomes adsorbed out of a bulk solution. The purpose of our investigations is to explore routes for the calculation of ΔA by molecular simulations. ΔA can be obtained both by integration over the mean force on a molecule and via the local density. It turns out that the route via the potential of mean force prevails over the latter due to better consistency. In this work we present results for systems of 1-centre and 2-centre Lennard-Jones mixtures at a 9/3 Lennard-Jones wall.

4

Fly ash zeolites as sulfur dioxide adsorbents

88%

Suchecki T. T., Walek T., Banasik M.

Polish Journal of Environmental Studies

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2004

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tom 13

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nr 6

Air protection technologies generate massive amounts of solid wastes, including fly ash (FA). Zeolite synthesis from FA seems to be an effective method for FA utilization. In addition, fly ash zeolites (FAZs) could be used for sulfur dioxide (SO2) adsorption. Since there is a lack of sufficient information about SO2 uptake on FAZs, we investigated this phenomenon in detail. Two commercially available zeolites, 3A and SM-27, and two FAZs, one manufactured by the authors and the other obtained from Kimura Chemical Plants, were used for SO2 adsorption tests. Our experiments confirmed that FAZs could be efficient SO2 adsorbents. Observed SO2–zero emission periods varied from 2-3 min for non-activated zeolites to 7-15 min for their thermally activated counterparts. The thermal activation of FAZs increased 2-3 times their SO2 adsorption capacity, resulting in up to 38 mg of SO2/g of zeolitic material.

5

Adsorption of mercuric ion from aqueous solutions using activated carbon

88%

Khalkhali R. A., Omidvari R.

Polish Journal of Environmental Studies

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2005

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tom 14

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nr 2

Activated carbon (AC) was prepared from hazelnut shells using two steps of carbonization followed by steam activation. Methylene blue dye was used as a probe for evaluation of the prepared activated carbon. In order to have a better comparison, a commercial grade of activated carbon (powdered) obtained from the Merck Company has also been used in this research as standard. In this paper we have also investigated adsorption of mercuric ion by impregnated activated carbon with different chemicals. It was found that sorption of mercuric ion from aqueous solution by activated carbon can be improved by impregnating AC with suitable chemicals such as sulfur-containing compounds.

6

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Verification of potential theory of adsorption in determining food sorption isotherms

88%

Ocieczek A.

Acta Agrophysica

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2006

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tom 07

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nr 1[132]

7

Adsorption of water vapour on montmorillonite: grant canonical ensemble Monte Carlo simulations

88%

Delville A., Sokolowski S., Kozak E., Sokolowska Z.

International Agrophysics

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1995

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tom 09

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nr 1

8

Adsorption of antimicrobial surfactants by bacterial cells in the course of biodegradation processes

88%

Sirotkova L., Cupkowa V., Mlynarcik D., Devinsky F., Lacko I.

Polish Journal of Environmental Studies

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1994

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tom 03

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nr 2

A quaternary ammonium salt (A), a bisquaternary (FB), and an amine oxide (B) were tested for biodegradability using bacterial strains isolated from a municipal waste-water treatment plant Adsorption of the compounds by the cells was distinguished from actual biodegradation. The bisquaternary hard detergent FB was of lower affinity to the bacterial cells in comparison to soft compound A, where adsorption is accompanied by degradation. A soft surfactant, amine oxide (B) is also degraded without marked adsorption by cells. Adsorption of the compouds by the cells is also lower in mineral biodegradation medius where cell membranes are stabilised by ions.

9

Minimization of phenol by natural occurrence adsorbent

75%

Joshi J., Sahu O.

International Letters of Natural Sciences

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2014

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tom 11

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nr 1

Phenol and chlorophenols are long-lived pollutants frequently found in industrial effluents. Phenols are widely used for the commercial production of a wide variety of resins including phenolic resins, epoxy resins and adhesives, and polyamide for various applications. Adsorption process has been proven one of the best water treatment technologies around the world and the removal of diverse types of pollutants from water. However, widespread use of commercial adsorbent is sometimes restricted due to its higher costs. Attempts have been made to develop inexpensive adsorbents utilizing for the reduction of phenol from water. Four types of adsorbent clay, algae, moringa oleifera and rice husk has been used. Among all rice husk shown 97 % of phenol adsorption at 1mm particle size, pH 4, 3 g/l dosing and 150min contact time.

10

Teoreticheskie osnovy aktivirovanija rastvorov koaguljanta sul'fata aljuminija pri podgotovke pit'evojj vody

75%

Epojan S., Dushkin S., Ajjrapetjan T.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2014

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tom 16

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nr 6

11

Lipid production and heavy metals adsorption by an Aspergillus fumigatus GAH1 isolate

75%

Haddad A. M., El-Shall H. S., Abu-Elreesh G.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2020

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tom 101

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nr 1

12

Removal of Cr(III) through bread mold fungus

75%

Shoaib A., Aslam N., Athar M. M., Akhtar S., Nafisa, Khurshid S.

Polish Journal of Environmental Studies

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2013

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tom 22

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nr 4

Cr(III) removal ability of indigenous soil fungus of Pakistan (i.e. Rhizopus arrhizus Fisher) was checked through batch trails. Experiments were performed by taking 0.1 g of powdered fungal biomass in 100 mL of metal solution kept at 150 rpm for 3 hours. Results of FTIR spectroscopy revealed that amine (-NH2) and hydroxyl (-OH) groups participated in Cr(III) binding with the fungal biomass. There was an inversely proportional relationship between adsorption efficiency and capacity on increasing initial metal concentration in the range of 20-100 mg/L. The adsorption capacity of fungal biomass was 43.47 mg/g as determined by Langmuir isotherm. High correlation coefficient (R2: 0.99) acquired through Langumir and Frendulich models adequately described the adsorption mechanism on fungal biomass. pH optimization trials in the range of 2-10 exhibited significantly greater adsorption efficiency of 75% at pH 4, while metal removal rate declined with increasing pH. Adsorption/adsorption trials with four acids indicted that maximum desorption of Cr(III) was found with HCl, followed by HNO3, CH3COOH, and H2SO4. Adsorption-based trials summarized that R. arrhizus is a potential and inexpensive biomaterial with viable application in the removal of Cr(III) from the aqueous solution.

13

Adsorption and desorption of boron on manganese oxide-coated sand as influenced by pH

75%

Wojcik P., Wojcik M.

Journal of Fruit and Ornamental Plant Research

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1999

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tom 07

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nr 4

14

Surface mass transfer during the sorption of basic dye onto boiler bottom ash

75%

Kumar K. V., Sivanesan S.

Polish Journal of Environmental Studies

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2004

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tom 13

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nr 4

Sorption experiments were carried out in batch process for the removal of color methylene blue from its aqueous solution using boiler bottom ash as an adsorbent. The operating variables studied were initial concentration and adsorbent dosage. The effect of external mass transfer coefficient, p, on these operating variables studied were estimated using Furusuwa - Smith model. The calculated p values were then correlated to dimensionless mass transfer numbers (Sh/Sc0 33). The dimensionless mass transfer numbers were found to vary with initial concentration, Co -0000002 and adsorbent dosage, M00085.

15

Experimental and theoretical studies on fluoresceine-PE in DPPC bilayer

75%

Kubica K., Langner M.

Cellular and Molecular Biology Letters

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1999

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tom 04

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nr 2

16

Adsorption of zinc in some selected soils

75%

Diatta J., Kocialkowski W.

Polish Journal of Environmental Studies

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1998

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tom 07

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nr 4

Eight soils were studied for adsorption reactions of zinc and evaluated for their quantity, intensity and supply parameters for zinc. With the addition of increasing amounts of zinc there was a simultaneous increase in the equilibrium concentration, adsorption, percent saturation of adsorption capacity and supply parameter of zinc. Multiple regression analysis revealed that in all soils quantity, intensity and equilibrium concentration were the main parameters accounting for the supply of zinc. Sandy loam, loamy and loamy sand soils having comparatively higher values for the adsorption maxima, bonding energy constant and differential buffering capacity of the soils will require higher rates of zinc to change in the solution concentration.

17

The effect of lipid bilayer organization on the adsorption of organometallic, amphiphilic molecules

75%

Langner M., Gabrielska J., Przestalski S.

Cellular and Molecular Biology Letters

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1999

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tom 04

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nr 2

18

Kinetics of water vapour adsorption and caking of whey powder

75%

Domian E., Wlodarska M.

Polish Journal of Food and Nutrition Sciences

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2007

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tom 57

|

nr 3[A]

The study was aimed at investigating caking of sweet whey powder and whey demineralized as a result of water vapor adsorption in respect of their sorption capacity. The analysis of the course of kinetic curves demonstrated that sweet whey was characterised by a higher capacity and rate of water vapour adsorption as compared to the demineralized whey. During storage at relative humidity of RH>0.43 the powders were subject to caking once the material reached water activity (aw) of 0.3-0.4, yet the sticking of powder particles proceeded faster in the case of sweet whey.

19

Removal of direct dyes from aqueous solution using various adsorbents

75%

Yavuz O., Aydin A. H.

Polish Journal of Environmental Studies

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2006

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tom 15

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nr 1

Dyestuff production units and dyeing units have always had a pressing need for techniques that allow economical pre-treatment for colour in the effluent. The effectiveness of adsorption for dye removal from wastewaters has made it an ideal alternative to other expensive treatment options. Removal of direct dyes [direct yellow 50 (DY50), direct red 80 (DR80) and direct blue 71(DB71)] from an aqueous solution by different adsorbents such as activated carbon, raw kaolinite and montmorillonite was investigated. The adsorption isotherm data were fitted to the Langmuir isotherm. Parameters of the Langmuir isotherm have been determined using the adsorption data. Adsorption capacity of RAC (commercial activated carbon), HAC (activated carbon obtained from shell of hazelnut), KC ( raw kaolinite) and MC (montmorillonite) increased in the following order: DY50 > DR80 > DB71, DB71>DR80>DY50, DR80>DB71>DY50 and DB71>DR80 (DY50 showed no absorption) for the direct dyes, respectively.

20

The effectiveness of surfactants adsorption onto chitin and dye-modified chitin

75%

Klimiuk E., Gusiatin Z., Kabardo K.

Polish Journal of Environmental Studies

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2006

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tom 15

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nr 1

Adsorption of anionic (Borutosol KRN, Siarczanol N-2) and nonionic (Rokafenol N-8) surfactants onto chitin and dye-modified chitin (Brillantorange 3R, Scarlet R and Black DN) was investigated. Experiments were carried out at pH 3.0 and pH 6.2. The Langmuir-Freundlich model was used to describe adsorption isotherms. It was proved that adsorption isotherms of SAAs* onto chitin were S-type. The adsorption was the most effective for anionic SAAs. It was stated that adsorption of SAAs onto dye-modified chitin depended on dye type, bound previously onto chitin and on pH adjustment. At pH 3.0, for vinyl dye-modified chitin (Brillantorange 3R, Scarlet R) the highest adsorption capacities at plateau region were stated for Borutosol KRN (320 and 330 mg/g d.w., respectively) and Siarczanol N-2 (290 and 310 mg/g d.w.). However, for Black DN-modified chitin, the mass of adsorbed anionic surfactants was distinctly lower – 120 mg/g d.w. for Borutosol KRN and 13 mg/g d.w. for Siarczanol N-2. The pH increase from 3.0 to 6.2 caused a drop in amount of SAAs adsorbed at plateau region. Dye solubilization was demonstrated for dye-modified chitin. The amount of dissolved dyes in solution depended on pH adjustment as well as SAA type. At pH 3.0, for anionic SAAs dye solubilization increased clearly with the increase of SAA concentrations. Nonionic Rokafenol N-8 almost did not cause dye solubilization. At pH 6.2 dye solubilization was nearly independent of SAA concentration.

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