However, it appears very specific to certain microorganisms and has only been demonstrated in marine sediment studies [8].
See the legends of the individual maps for further details. Figure 4 Number of sediment studies documenting paleomagnetic field variations for some portion of the past 50 ka.
We have therefore developed a series of structurally distinct results and metadata tables to accommodate the different and varied parameters measured in sediment studies.
In addition, two datasets from studies of the transformation in aquatic sediment systems (water sediment studies) and one dataset from an aerobic soil metabolism study were provided by UBA.
These include searchable lists of archeo/volcanic and sediment studies ('Web site features' section) and a glossary of identification numbers used to describe the metadata ('General structure of the MySQL database' section).
H. azteca is a common test organism for aquatic toxicity tests in North America (ASTM) and has been often used in sediment studies on metals [42, 43], including bioaccumulation approaches [44].
In database terminology this is often called a record; however, within sediment studies, the use of record denotes a complete data set.An entry shows data at the site level.
While it is widely accepted that separate degradation parameters for the water and the sediment phase in water sediment studies can not precisely be determined using the data generally available from such studies [12], such evaluations are still performed because they are requested by the FOCUS guidance.
The core collection areas in both lakes are near sites where cores were collected in previous lake sediment studies (Hermanson 1990 , 1991 1993).
Sediment studies show enrichment in Hg deposition for approximately the past century with the extent of increases in Hg deposition from preanthropogenic values decreasing with increasing latitude from the midlatitudes (41 50°N).
There are numerous paleopalinological and sediment studies that describe that this region has been fragmented with dry open areas related to glaciation-driven events during the Pleistocene [ 71, 72, 73, 74].
