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- Dyrssen, David, et al.
(author)
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Complexation of aluminum with DNA.
- 1987
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In: Journal of inorganic biochemistry. - 0162-0134 .- 1873-3344. ; 29:1, s. 67-75
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Journal article (peer-reviewed)abstract
- The extent of complexation of aluminum(III) with DNA (Calf thymus, Sigma type I) was estimated by means of two experimental techniques: potentiometric titration with a fluoride selective indicator electrode and dialysis followed by aluminum determination by graphite furnace AAS. Both types of experiments indicate that aluminum(III) is bound to DNA. The data are treated by assuming an ion exchange reaction with the phosphate diester groups. Using Rt to denote the concentration of these groups the values of log [AlMn-3R]/(Rt-3[AlMn-3R])[Al3+] decrease from approx. 7.6 to 5.6 when the concentration of sodium chloride is increased from 1 to 100 mM. In the pH range 4.5-5.5 the ion exchange constant increases approximately 0.5 log units. Dialysis gives lower values for the complex formation constant than potentiometry.
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- Berglund, Pia M
(author)
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Kolväten i luft vid bensinstationer
- 1989
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Licentiate thesis (other academic/artistic)abstract
- Kolväten i luft vid bensinstationer har undersökts med hjälp av gaskromatografiska analyssystem. I flertalet prover identifierades 20-30 lätta kolväten. Särskilt intresse ägnades åt det cancerogena kolvätet bensen samt åt alkenerna. Mätningar vid stationer med återföringssystem visade att en bilist som tankar på ett riktigt sätt endast inandas ungefär en hundradel av den mängd kolväten som tankning vid en konventionell station ger. Utsläppet av bensinångor till luft vid tankning minskar effektivt i motsvarande grad.
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- Gabrielsson, Britt, 1957, et al.
(author)
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Effects of divalent metal ions on the uptake of glutamate and GABA from synaptosomal fractions
- 1986
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In: Brain Research. - 0006-8993. ; 384:2, s. 218-23
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Journal article (peer-reviewed)abstract
- The effects of divalent metal ions on high affinity uptake glutamate and GABA were examined, using crude and purified synaptosomal fractions prepared from brains of DBA/2CBI. The uptake velocities of both amino acids are severely reduced in the presence of Cu2+, Fe2+ and Zn2+ but remain unaffected by Co2+.
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- Hansson, H. C., et al.
(author)
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PIXE in complex analytical systems for atmospheric chemistry
- 1987
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In: Nuclear Inst. and Methods in Physics Research, B. - 0168-583X. ; 22:1-3, s. 235-240
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Journal article (peer-reviewed)abstract
- A schematic mechanistic box model presenting processes in atmospheric chemical cycles is used to present the main research objectives. From this the main use of PIXE within atmospheric chemistry is discussed. An analytic system giving molecular composition is necessary to fully understand and quantify the chemical and physical pathways described in the model for different compounds. Combining PIXE with complementary techniques can enhance knowledge of molecular composition. Therefore, techniques which are complementary to PIXE that give such important parameters as mass, soot, and major ions are discussed. Difficulties in efficiently combining and using the discussed analytical techniques in practice are recognized. The sampling substrates and sampling methods used are discussed and evaluated from this point of view. The use of thin Al foil as substrate and an electrostatic precipitator for aerosol sampling is suggested as one solution. The importance of developing methods for use of this analytical system of the different phases present in the atmosphere is stressed.
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