Uranium Trappers, a Partial Order Study
197
the other component. Microorganisms isolated in the component on the right (five
microorganisms) are characterised by performing the biosorption process in a very
long time greater than 6 hours, whereas the microorganisms in the component on
the left, trap U in 1 h or less than 1 h as in the case of bacteria 3, 50 and 72 whose
U removal time is equal to 0.5, 0.083 and 0.33 h, respectively.
In the HD shown in Fig. 1 (Quintero et al. 2018), the maximal microorganisms
are located at the top (19, 22, 24, 44, 50, 72, 81) whereas minimal microorganisms
(4, 10, 32, 38) are located at the bottom; maximal and minimal ones correspond to
the best and the least suitable microorganisms for U removal respectively. Figure 1
(Quintero et al. 2018) also shows that by the simultaneous consideration of %U,
UC and eff it is not possible to find a single best microorganism in the set under
study. Instead, several microorganisms are found as maximal ones. A top eight
microorganisms are found applying LPOM-methods (Quintero et al. 2018); both
ranking methodologies are coincident in the first eight positions, they are from the
first to the eighth:
Bacillus licheniformis ATCC 14580 (22)
Bacillus mucilaginosus ACCC 10012 (24)
Pseudomonas MGF-48(50)
Bacillus subtilis IAM 11062 (19)
Streptomyces sp. (72)
Pseudomonas sp. EPS-5028 (48)
Actinomyces levoris HUT 6156 (2)
Arthrobacter nicotianae IAM 12342 (6)
Numbers in parenthesis represent the label in the HD (Fig. 1) (Quintero et al.
2018).
Because of the presence of some ties, i.e., same values in average ranks for some
microorganisms, the last ranks are not available in Table 2 (Quintero et al. 2018).
These results show that the microorganism 22 (Bacillus licheniformis ATCC 14580)
is the best U trapper. It belongs to the maximal microorganisms (Fig. 1). If the
maximal microorganisms in Fig. 1 are inspected, five out of eight are considered as
well as good U trappers according to the top eight obtained from the application
of order theoretical methods; these five microorganisms are 19, 22, 24, 50 and
72 (Quintero et al. 2018). The top three microorganisms in the current study also
coincide with the results found in the study by (Quintero et al. 2017).
4.2 Biological Interpretation
From the taxonomical point of view, the top three microorganisms in the group
under study are bacteria classified in two genera, Bacillus and Pseudomonas, that
include microorganisms traditionally used as potent U biosorbents. However not all
bacteria belonging to the same genus are good U trappers from aqueous systems
(Quintero et al. 2017).
197
the other component. Microorganisms isolated in the component on the right (five
microorganisms) are characterised by performing the biosorption process in a very
long time greater than 6 hours, whereas the microorganisms in the component on
the left, trap U in 1 h or less than 1 h as in the case of bacteria 3, 50 and 72 whose
U removal time is equal to 0.5, 0.083 and 0.33 h, respectively.
In the HD shown in Fig. 1 (Quintero et al. 2018), the maximal microorganisms
are located at the top (19, 22, 24, 44, 50, 72, 81) whereas minimal microorganisms
(4, 10, 32, 38) are located at the bottom; maximal and minimal ones correspond to
the best and the least suitable microorganisms for U removal respectively. Figure 1
(Quintero et al. 2018) also shows that by the simultaneous consideration of %U,
UC and eff it is not possible to find a single best microorganism in the set under
study. Instead, several microorganisms are found as maximal ones. A top eight
microorganisms are found applying LPOM-methods (Quintero et al. 2018); both
ranking methodologies are coincident in the first eight positions, they are from the
first to the eighth:
Bacillus licheniformis ATCC 14580 (22)
Bacillus mucilaginosus ACCC 10012 (24)
Pseudomonas MGF-48(50)
Bacillus subtilis IAM 11062 (19)
Streptomyces sp. (72)
Pseudomonas sp. EPS-5028 (48)
Actinomyces levoris HUT 6156 (2)
Arthrobacter nicotianae IAM 12342 (6)
Numbers in parenthesis represent the label in the HD (Fig. 1) (Quintero et al.
2018).
Because of the presence of some ties, i.e., same values in average ranks for some
microorganisms, the last ranks are not available in Table 2 (Quintero et al. 2018).
These results show that the microorganism 22 (Bacillus licheniformis ATCC 14580)
is the best U trapper. It belongs to the maximal microorganisms (Fig. 1). If the
maximal microorganisms in Fig. 1 are inspected, five out of eight are considered as
well as good U trappers according to the top eight obtained from the application
of order theoretical methods; these five microorganisms are 19, 22, 24, 50 and
72 (Quintero et al. 2018). The top three microorganisms in the current study also
coincide with the results found in the study by (Quintero et al. 2017).
4.2 Biological Interpretation
From the taxonomical point of view, the top three microorganisms in the group
under study are bacteria classified in two genera, Bacillus and Pseudomonas, that
include microorganisms traditionally used as potent U biosorbents. However not all
bacteria belonging to the same genus are good U trappers from aqueous systems
(Quintero et al. 2017).