In Sweden, there are 2 major fixation methods, either the AO method (plate and screws) or the Cedell method (cerclage wire and staple).
Fixation of TEs can take place in small populations by genetic drift [ 17- 20], and small population sizes might have played a major role in fixation of non-adaptive DNA in eukaryotes, including TEs [ 21- 23].
SRB activity has been reported in the upper 0.5 cm of the mat during day [ 6], but the activity may be limited to small anoxic microenvironments and is unlikely to represent a major daytime CO2 fixation strategy.
Methane addition lead to significant uptake of 13C CH4 derived carbon, but did not affect N2 fixation rates compared to controls, indicating that CH4 dependent N2 fixation is probably not a major contributor to N2 fixation in the studied ecosystem.
A major improvement on the fixation of biological specimen occurred with the introduction of cryo-fixation.
The realisation of bioactive screws, in particular fine-threaded stainless steel screws, offers a major advancement towards the fixation of both internal and external orthopaedic implants.
The interspecific differences in stomatal sensitivity to water vapour were extremely important, as relative humidity is a major factor influencing carbon fixation and the rate of pollutant absorption.
Although methanotrophs comprised less than 0.1% of the 16S rRNA, this alone does not exclude them from being a major contributor to N2 fixation.
Taking into account both sources of data, we hypothesized that up-regulated genes identified by microarray data and those genes that codify for the identified proteins potentially reveal those genes with a major role in nitrogen fixation.
However, the iron requirements of Trichodesmium are considerably greater than those of other marine Synechococcus because nitrogen fixation is a major sink for iron (photosynthetic electron transfer requires 23 24 iron atoms, nitrogen fixation requires an additional 19 iron atoms) [45].
