| 1. |
- Andrén, Thomas, et al.
(författare)
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New insights on the Yoldia Sea low stand in the Blekinge archipelago, southern Baltic Sea
- 2007
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Ingår i: GFF. - 1103-5897 .- 2000-0863. ; 129, s. 277-285
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Tidskriftsartikel (refereegranskat)abstract
- One sediment core from the Jarnavik bay in Blekinge archipelago has been investigated for its content of pollen and diatoms and its chemical properties. Two levels were also dated by radiocarbon. Based on the results the sediment sequence analysed has been divided into three environmental units largely corresponding to the lithology of the sequence. A lowermost unit consisting of weakly varved and homogeneous clay was deposited during the end of the brackish phase of the Yoldia Sea at a moderate water depth. On top of this unit a gyttja-clay unit was deposited. The onset of the deposition of this unit has been dated to c. 11 100 cal. yrs. BP. An increasing organic production and increased terrestrial influence is recorded in the chemical data and a very shallow water depth is indicated in the pollen and diatom flora. These results point to conditions in a bay probably isolated from the Yoldia Sea. A local tentative shore displacement curve have been constructed and it is proposed that this unit represents the low stand at c. -18 m during the Yoldia Sea stage in this part of the Baltic Sea basin. The uppermost unit consists of homogeneous clay with a low content of organic carbon. An increasing water depth is indicated by the composition of both pollen and diatoms. The diatom flora also displays an increase in freshwater species. This environmental change was probably the result of a transgression in the beginning of the Ancylus Lake stage.
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| 2. |
- Wang, Yong-Bin, et al.
(författare)
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A novel dual mode capacitor biosensor for real-time, label-free DNA detection
- 2006
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Ingår i: 2006 INTERNATIONAL ELECTRON DEVICES MEETING, VOLS 1 AND 2. - NEW YORK : IEEE. - 9781424404384 ; , s. 447-450
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Konferensbidrag (refereegranskat)abstract
- A novel biosensor working in both MOS capacitor and electric double-layer capacitor mode for real-time, label-free DNA detection is presented. The former mode measures density and polarity of charged biomolecules to be monitored, while the latter mode appears to reveal more of surface-molecule interactions and offers high sensitivity and easiness for diagnosis. A combined mode-utilization yields optimal complementary information of significance.
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| 3. |
- Yu, Shi-Yong, et al.
(författare)
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Holocene organic carbon burial rates in the Baltic coast
- 2007
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Ingår i: The Holocene. - 0959-6836. ; 17:5, s. 673-681
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Tidskriftsartikel (refereegranskat)abstract
- To estimate Holocene changes in organic carbon mass accumulation rates (Corg MARs) in the southeastern Swedish Baltic Sea, two sediment cores were studied in combination with biogeochemical modelling. Prior to 11 300 cal. BP, Corg MARs were extremely low, indicating low organic matter production on the catchment of the Baltic Ice Lake. Following a brief regression, the Ancylus Lake stage occurred between 11 100 and 9800 cal. BP. Corg MARs increased substantially during this period because of enhanced washing in of terrestrial organic matter, when boreal forests were initially established. The prominent marine stage, known as the Littorina transgression between 8500 and 3000 cal. BP, is marked by a minor increase in Corg MARs. Our modelling reveals a changing terrestrial organic carbon input between 100 and 1000 g/m2 per yr that accounts for 30–80% of total organic carbon in sediments of the southeastern Swedish Baltic Sea, with maximum values (c. 20 x 103 g/m2 per yr) occurring during the Bronze/Iron Age transition at about 3000 cal. BP. Corg MAR in the entire Baltic basin is estimated at 3.01 x 106 t/yr during the pre-industrial Holocene, comparable with other large inland water bodies. Regardless of the source of carbon, our data indicate that the Baltic basin is an important sedimentary reservoir for organic carbon storage and thus should be included in accounting for global terrestrial carbon cycling during the pre-industrial Holocene.
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