Chemical and spectroscopic characterization of algae surfaces

Article Abstract:

FT-IR, continuous-wave electron paramagnetic resonance and two-pulse electron spin-echo envelope modulation were used to characterize the surfaces of the two algae species Cyclotella cryptica and Chlamydomonas reinhardtii with respect to their interactions with copper. The methods provided information about the kinds of functional groups on the surfaces. Maximum proton binding capacities were placed at 9.7 x 10(super -4) for C. cryptica and 9.1 x 10(super -4) mol/g algae for C. reinhardtii. Maximum Cu(II) binding capacity was 7.6 x 10(super -7) mol/g for the diatom and 6.2 x 10(super -6) mol/g for the green alga. Copper occupied less than 1% of the total proton binding sites under the conditions.

Analysis, Algae, Electron paramagnetic resonance spectroscopy, Fourier transform infrared spectroscopy, Chlamydomonas

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Reconstructing past oceanic temperatures from organic biogeochemistry, chemical fossils and molecular stratigraphy

Article Abstract:

Past surface ocean temperatures are established by applying molecular stratigraphy to the chemical fossils or biomarkers found in various marine sediments. The saturation indices of a series of alkenones found in the sediments are employed to obtain past oceanic temperatures by means of an accepted temperature calibration technique. Results indicate that sea surface temperature data derived from the molecular stratigraphy of alkenones can be used for other scientific purposes, including the estimation of seawater salinity.

Measurement, Biogeochemistry, Ocean temperature, Paleoceanography, Paleontology, Stratigraphic, Stratigraphic paleontology

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Stability of mixed-ligand complexes of metal ions with low molecular weight ligands

Article Abstract:

The stability of mixed-ligand complexes of metal ions with humic substances and low molecular weight ligands is investigated. It is shown that the fraction of metal bound to humic substances in a system can be modeled better if mixed-ligand complexes are also included. However, mixed-ligand complexes of the type MSLi are innately weak as compared to complexes with low molecular weight ligands.

Ligands (Biochemistry), Humic acid, Humic acids, Metal ions

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