Wyniki wyszukiwania - AGRO

1

Applications of metal ions for peptide analysis in enzymatic protein hydrolysates

100%

Baraniak B., Karas M.

Journal of Elementology

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2009

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tom 14

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nr 3 Suppl.

12-13

2

Recovery of metal ions from electroplating rinse solutions using the Donnan dialysis technique

100%

Wodzki R., Sionkowski G., Hudzik-Pieta T.

Polish Journal of Environmental Studies

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1996

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tom 05

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nr 4

Electroplating rinse solutions contain considerable amounts of multivalent valuable or toxic metal ions. The attempt to recover them was made using the Donnan dialysis (DD) technique, applying a cation-exchange polymer membrane. Laboratory experiments dealing with processing two different solutions containing Zn(ll) [A], or Zn(II), Cu(II), Ni (II), Cr(III) and Fe(III) [B] were carried out. The results demonstrated DD to be efficient for recovering Zn(II) (soln.A) and other multivalent metals (soln.B) in the sequence Ni, Cu>Fe>Zn>Cr. Recovery factors amount to 80-90% and 74-94% for A and B solutions, respectively. The optimum concentration of sulfuric acid in the strip solution ranges from 0.25 to 0.5 M.

3

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Influence of secondary transformation index of peat-muck soils on the content of selected metals

88%

Boguta P., Sokołowska Z., Bowanko G.

Acta Agrophysica

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2011

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tom 18

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nr 2[193]

The main aim of the study was the determination of the content of selected metal ions in soils originating from Polesie Lubelskie and Biebrza River Region, as well as an attempt at relating the results obtained to the degree of secondary transformation of studied soils. All the soils belonged to peat-muck soils and differed from each other in their secondary transformation index. The study included analyses of the content of potassium, calcium, magnesium and manganese with the use of absorption atomic spectroscopy for the determination of the concentration of those metals. At the next stage of the study, relationships between the secondary transformation index of peat-muck soils and selected metal contents were examined. Weak linear relationships were found for the secondary transformation index and the content of calcium, manganese and potassium. A more complex situation was observed for the relation of magnesium ions. The lack of a straight-line trend could be explained in this case by the effect of chemical processes occurring in particular classes of mucks transformation on magnesium ion binding.

4

Removal of heavy metal ions on smectite ion-exchange column

88%

Wojtowicz A., Stoklosa A.

Polish Journal of Environmental Studies

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2002

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tom 11

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nr 1

The present work is a continuation of studies on the use of ion-exchanging properties of smectite raw material from Męcinka mine to the recovery of chromium from waste water. In this work the smectite ion-exchange column was used for removal of other heavy metals: Zn (II), Cd (II),Pb(II).Theeffect of ion-exchangeZn (II),Cd (II),Pb(II)from model solutions prepared out of nitrate salts of these metals was examined under dynamic conditions. The efficiency of ion-exchange column with smectite bed was determined by measuring in the column efflux till the moment when the concentration of metals in efflux is equal to concentration in influx. For measurement of concentration of metals the voltamperometric method was used. The ion-exchanging column was determined by stating the following parameters: sorption capacity of exchanger, volume of solution till the moment of column breakthrough (Vmax) and column dynamics, which meansthe relative concentration of metal ions c/c0 in theefflux as a function of efflux volume. Out of the model waste water containing three heavy metals, the best eliminated is Pb (II) and subsequently Zn (II). The efflux volume classified to the 1st and 2nd category of water cleanness amounts to about 1/3 Vmax. Worse results are observed for ions Cd (II), which have the least ion exchange ability. The obtained results of studies on removal of ions of heavy metals: Zn (II), Cd (II), Pb (II) out of model waste water confirm, similar to the Cr (III) studies, the possibility of application of the raw smectite adsorbent as the column packing within the process of removal of heavy metals.

5

Leaching of metal ions in mine water from solid mine wastes

88%

Baranowski R., Kot B.

Polish Journal of Environmental Studies

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1996

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tom 05

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nr 3

This paper presents the results of leaching of Co, Cd, Cu, Mn, Ni and Zn ions from solid wastes in mine waters of various salinity. Determinations of the content of examined elements in mine waters and in solutions from leaching of solid mine wastes were carried out by atomic absorption spectroscopy, after preliminary extraction of elements in the form of pyrrolidinedithiocarbamates. To obtain complete characteristic of examined mine waters and solutions from leaching, standard analyses, commonly used for water and wastes, were done.

6

The effect of metal ions and metabolites on the activity of pyruvate kinase from bean roots

88%

Jezewska M. J., Flieger M.

Applied Biology Communications. Lublin Scientific Center

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1992

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tom 02

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nr 4

7

Dissimilatory sulfate reduction in media containing common metal ions

88%

Szymanska K., Domka F.

Polish Journal of Environmental Studies

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1996

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tom 05

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nr 5

This paper reports the results of an investigation of the effect of Zn2+, Mg2+, Cu2+, Ni2+, Fe2+, Fe3+, Mn2+ and Cr3+ ions present in the media on the kinetics of dissimilatory reduction of sulfates in Desulfotomaculum ruminis bacteria. It has been shown that the range of the optimum concentration of studied elements is different; sometimes very wide but sometimes very narrow. After a certain threshold concentration of a given element has been reached, its presence either causes total inhibition of the process or has a toxic effect.

8

Use of selected metal ions for the separation of peptides isolated from thermally processed string beans

75%

Karas M., Baraniak B.

Journal of Elementology

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2010

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tom 15

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nr 2

291-300

Recent years have witnessed growing interest in research on the structure and properties of proteins and peptides as physiologically active dietary components. The above has spurred a new interest in the isolation of animal, plant and microbiological peptides and investigation of their biological activity. The isolation and separation of protein and peptide mixture is not an easy procedure. Immobilised Metal Ion Affinity Chromatography (IMAC) is increasingly often used in this process. Affinity chromatography relies on the specific interactions between amino acids, their reactive groups in peptides and metal ions. The objective of this study was to determine whether copper and nickel ions can be used for the separation of peptides isolated from string beans than had been blanched and heated in a microwave oven. In this study, peptides extracted with 1% trichloroacetic acid (TCA) from string beans that had been blanched and heated in a microwave oven, were separated by chromatography on columns with copper and nickel ions immobilised through iminodiacetic acid (IDA). Peptide concentrations of the separated fractions were determined. Peptides found in string beans had similar affinity for metal ions in the Cu > Ni sequence, with selectivity in the Ni > Cu sequence. Microwave heating of string beans decreases the peptide content of extracts isolated with 1% TCA. The resulting changes are dependent on the duration of the process and the type of heating medium. Affinity chromatography with the use of metal ions immobilized to iminodiacetic acid (IDA)-Sephadex G-25 may be successfully used for the separation of peptides isolated from string beans.

9

Assessment of toxic interaction of metals in binary mixtures using Lepidium sativum and Spirodela polyrrhiza

75%

Montvydiene D., Marciulioniene D.

Polish Journal of Environmental Studies

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2007

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tom 16

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nr 5

777-783

The toxicity of CuS0^5H20, K£r2O7, ZnS0^7H20, and Ni(N03)2 and their binary mixtures on L. sativum and S. polyrrhiza was determined. The type of toxic interaction at each tested metal combination was evaluated by a statistical approach on testing the null hypothesis of "additive toxicity" at p<0.05. The effects were defined as antagonistic, additive, or synergistic, in accordance with the sign of difference between the tested hypothesis and the value of the observed toxicity at tested combinations. In the majority of metal combinations, the interactions for L. sativum were of antagonistic nature (94%), and only 6% of additive. The 100% additive interactive effects were found in the metal mixtures for S. polyrrhiza. The antagonistic or additive interactive effects found in almost all metal ion mixture combinations confirms the presumption that the interaction between ions can be caused by competition for the same reaction center on cell membranes if these ions belong to the same group of Lewis acids.

10

Some aspects of the copper(II) - DNA interaction

75%

Pawlowski T., Gulanowski B., Swiatek J., Gasiorowski K., Kozlowski H.

Acta Biochimica Polonica

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1989

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tom 36

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nr 1

11

The role of metal ions in biological oxidation - the past and the present

75%

Kleczkowski M., Garncarz M.

Polish Journal of Veterinary Sciences

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2012

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tom 15

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nr 1

Two theories, one based on the metabolism of inorganic substances, the other on metabolism of organic substances, have played an important role in the explanation of the origin of life. They demonstrate that the original environment of life on Earth was seawater containing micronutrients with structural, metabolic and catalytic activity. It is assumed that the first primitive organisms lived around 3.8 billion years ago and it was also then that the first catalytic reaction involving metal ions occurred. Biological oxidation leading to oxidative stress and cell damage in animals represents one of these types of reactions which are responsible for many animal diseases. The role of prooxidative and antioxidative actions of transition metal ions as well as their neuropathological consequences have therefore been the topic for many research projects. There is hope that metal chelates and antioxidants might prove to be a modern mode of therapy for i.e. neurogenerative diseases. The aim of this review is to show the evolution of scientific knowledge on metal ions, their biological oxidation, and an overview of their role in physiology and in pathological processes.

12

The growth of Saccharomyces cerevisiae yeast in cadmium enriched media

75%

Pasternakiewicz A.

Acta Scientiarum Polonorum. Technologia Alimentaria

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2006

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tom 05

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nr 2

39-46

The effect of Cd2+ ions on the growth of Saccharomyces cerevisiae yeasts grown in a natural and a synthetic medium was studied. Two strains, B, i G,, were used. Both strains displayed high sensitivity to increased cadmium salt contents, particularly those grown in a synthetic medium. High concentrations of cadmium (> 50 pM) practically stopped the growth of the studied strains. The negative effect of cadmium ions was partly altered by adding zinc or calcium salts to the synthetic YM medium.

13

The effect of Mo6plus, W6plus, Cu2plus ions on denitrification by Bacillus licheniformis

75%

Juszczak A., Domka F., Seifert K.

Polish Journal of Environmental Studies

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1996

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tom 05

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nr 3

In this paper the effect of Mo6+, W6+, and Cu2+ ions on kinetics of denitrification and growth of Bacillus licheniformis is presented. The absence lack of Mo6+ and Cu2+ in the growth medium appeared to have no effect on the kinetics of the process. This fact suggests that these ions are not a part of the active centers of denitrification enzymes. Additionaly tungsten (VI) which is competitive to molybdenum (VI) does not inhibit denitrification in concentrations up to 0.1 g/dm3. Molibdenum (VI) starts to inhibit denitrification from 5.0 g/dm3 and copper (II) starting from 0.03 g/dm3.

14

DNA interaction with biologically active metal ions. Cooperativity of metal ion binding at compacting of DNA

75%

Kornilova S., Hackl E., Kapinos L., Andrushchenko V., Blagoi Y.

Acta Biochimica Polonica

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1998

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tom 45

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nr 1

The interaction of Cu2+, Mn2+ and Ca2+ ions with DNA in aqueous and water-ethanol solutions at different metal ion concentrations was studied by IR-spectroscopy. At sufficiently high DNA concentrations, DNA interaction with Cu2+, Ca2+ and Mn2+ ions results in compacting of DNA in the aqueous solutions. This process shows a very high cooperativity. In the presence of alcohol, DNA condensation takes place at much lower concentrations of metal ions used than in pure aqueous solution. Binding constants and cooperativity of the metal ion binding rise, and the non-monotonous dependencies of the binding degree, r, on the concentration of free metal ions, Cf , become pronounced. Binding isotherms take the S-like form similar to van der Waals isotherms for phase transitions of the liquid-vapour type. Cu2+ and Ca2+ ion binding to DNA in water-ethanol solutions also results in compacting of DNA macromolecule. The process is characterised by a high positive cooperativity and has a phase transition character.

15

Effect of selected compounds on the activity of glutamate dehydrogenase from triticale roots

75%

Kwinta J., Bartoszewicz K., Bielawski W.

Acta Physiologiae Plantarum

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2002

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tom 24

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nr 3

16

Evaluation of adsorption parameters and charge densities of some selected soils: application to lead

75%

Diatta J. B.

Electronic Journal of Polish Agricultural Universities. Series Environmental Development

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2002

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tom 05

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nr 2

An attempt to evaluate adsorption parameters and charge-based densities for Pb is reported in the paper. The method was based on the calculation of Langmuir adsorption maximum (amax), and the bonding energy term (b). The parameters were the outcome of well-established linear relationships of Ce/S versus Ce (Ce, equilibrium concentration and S, amount adsorbed). The use of charge-based sorption density parameter (SDCEC), which expressed the number of accessible charges for Pb adsorption, evidenced the occurrence of two main adsorption phases, characterised by two different slopes. The first ones, varying from 0.536 to 3.144 were suggested to be attributed to high attractive sites, whereas the second with slopes from 0.011 to 0.259, probably represented low attractive sites.

17

Treatment of electroplating rinse solution by continuous membrane extraction and diffusion dialysis

75%

Wodzki R., Szczepanski P.

Polish Journal of Environmental Studies

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2001

|

tom 10

|

nr 2

This paper studies the recovery and concentration of Zn2+ and Cu2+ metal ions from industrial rinse water containing a mixture of Zn2+, Cu2+, Ca2+, Mg2+, K+, and Na+ salts. Transport and separation experiments were performed in a continuous membrane extraction (CME) system, i.e. in the membrane system composed of two contactors with a cation-exchange polymer membrane (Neosepta CMX) and an organic liquid (liquid membrane) circulating between. The organic solution was composed of kerosene and di-(2-ethylhexyl)-phosphoric acid or salicylaldoxyoxime (Acorga P-50) as the active extractant/carrier. The feed solution has been taken from a rinsing tank working in an industrial electroplating plant. Sulfuric acid (1 M) was applied as the stripping medium for metal ions. The total flux of target metals (Zn2+ and Cu2+) in the MHS with Acorga P-50 or D2EHPA was 97.1% and 71.4%, respectively. The product of the CME process can be further de-acidified by diffusion dialysis with the use of an anion-exchange membrane (Neosepta AFN-7). The coefficients of separation, enrichment, and up-hill transport characteristics indicate that the CME system with Acorga P-50 can be considered a part of a technology for the efficient recovery of Cu2+ and Zn2+ in metal finishing plants.

18

59Fe distribution and elimination after melanin administration in mice

75%

Nogaj P., Golek A., Bogacz A., Piatek K., Buszman E., Mossae I. B.

Acta Biochimica Polonica

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1992

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tom 39

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nr 1

19

Interaction of Fe3, Cu2 and Zn2 with melanin and melanoproteins from bovine eyes

75%

Andrzejczak J., Buszman E.

Acta Biochimica Polonica

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1992

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tom 39

|

nr 1

20

Influence of metal ions introduction to the solution by corrosion on phosphorus removal from waste water

75%

Wysocka I., Krzemieniewski M., Janczukowicz W., Pesta J.

Natural Sciences

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2001

|

tom 09

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