Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 3

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

Search:
in the keywords:  TRACE ELEMENT
help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1

Distribution of elements in sediment cores of the Southern Baltic from the point of view of principal component analysis

100%
Szefer P., Kaliszan R.
Oceanological Studies
|
1993
|
issue 64/3
95-102
2

Toxic metals in bottom sediments and ferromanganese concretions of the Southern Baltic Sea

100%
Szefer P.
|
2000
|
vol. 29
|
issue 1
31-55
EN
Horizontal and vertical distributions of micro- and macroelements in sediment from the Southern Baltic (including the Vistula Lagoon) are discussed. Variations of concentrations of trace metals and rare earth elements (REE) in ferromanganese concretions sampled from S?upsk Furrow in the Polish Exclusive Economic Zone are characterized. The lack of positive cerium anomalies in the concretions from S?upsk Furrow indicates that they were formed under less oxidizing conditions than spheroidal concretions from the Gulf of Bothnia. M?ssbauer studies indicate that poorly crystalline lepidocrosite is the principal iron oxyhydroxide mineral present in these concretions. It is concluded that Ag, Cd, Pb, Zn and possibly Cu are anthropogenic in origin. The concentrations of these elements decrease sharply with depth in the sediment column and the elements are preferentially enriched in the < 2 ?m size fraction of the sediment. The anthropogenic elements show no systematic decrease in concentration with depth in a sediment core collected near the mouth of the Vistula River. This reflects the higher sedimentation rate there such that the entire upper 20 cm of the core was deposited during the major, post-war period of industrialization in Poland. It is suggested that the heavy metals are mainly adsorbed on Fe oxyhydroxide particles with diameters greater than 2 ?m at the hydrological front where the Vistula River waters mix with brackish Baltic waters. It appears that heavy-metal pollution of sediments in some parts of Puck Bay may be greater than that near the mouth of the Vistula River which may reflect, in part, the higher sedimentation rate near the mouth of the Vistula River. The mode of incorporation of heavy metals into the sediments in the two areas may also be different. It is speculated that Cu, Zn and Ag have been introduced recently into the sediments of the Gulf of Gda?sk principally from the Vistula River, whereas Cd and Pb have been transported, in part, from the atmosphere. Cd like Pb is a volatile element easily subjected to atmospheric transport. The dual source of Cd and Pb (atmospheric and riverine) reaching the Gulf of Gda?sk may explain the complex interelement relationships displayed by these elements in the sediments of this region. Ag, on the other hand, is introduced into the marine environment mainly with sewage sludge.
3

Modulating the immune response by oral zinc supplementation: a single approach for multiple diseases

88%
Overbeck S., Rink L., Haase H.
Archivum Immunologiae et Therapiae Experimentalis
|
2008
|
vol. 56
|
issue 1
15-30
EN
Zinc is required for multiple cellular tasks, and especially the immune system depends on a sufficient availability of this essential trace element. During the last decades, many studies attempted to affect the outcome of various diseases by zinc supplementation. These efforts either aimed at supporting immunity by zinc administration or at correcting a loss of zinc secondary to the disease to restore the zinc-dependent functions of the immune system. This review aims to summarize the respective findings and to discuss possible molecular mechanisms by which zinc could influence viral, bacterial, and parasitic infections, autoimmune diseases, and the response to vaccination. Zinc supplementation in diseases such as diarrhea, chronic hepatitis C, shigellosis, leprosy, tuberculosis, pneumonia, acute lower respiratory infection, and leishmaniasis seems beneficial. In contrast, the results for the common cold and malaria are still not conclusive, and zinc was ineffective in most vaccination and rheumatoid arthritis studies. For AIDS and type 1 diabetes, zinc supplementation may even be a risk factor for increased mortality or deterioration of the glucose metabolism, respectively. In these cases, zinc supplementation should be used with care and limited to clearly zinc-deficient individuals.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.