Occurrence of XoxF-type methanol dehydrogenases in bacteria inhabiting light lanthanide-rich shale rock

This study analyzed the occurrence of lanthanide-dependent (XoxF type) methanol dehydrogenases in the bacterial community inhabiting shale rock. The studied bacterial community was dominated by Proteobacteria, including Alpha-, Beta-, and Gammaproteobacteria classes. Four taxonomic groups known from the literature as capable of producing XoxF were detected among Proteobacteria, including: (i) only methylotrophic species (1.4% of Proteobacteria); (ii) both methylotrophic and nonmethylotrophic species (15.65%), (iii) species performing methylotrophic co-metabolism (5.74%), and (iv) only nonmethylotrophs (18.47%). In total, 22 sequence matches of XoxF enzymes were identified in the metaproteome of the bacterial community. This enzyme was produced by Alpha- and Betaproteobacteria represented by five orders such as Rhizobiales, Rhodobacterales, Rhodospiralles, Burkholderiales, and Nitrosomonadales. The dominant number of sequences came from Rhizobiales. Among the identified XoxF proteins, seven belonged to XoxF1 clade and 15 to XoxF5 clade. In the studied bacterial community, Ca-dependent methanol dehydrogenases were not detected. This study is the first to show the occurrence of XoxF proteins in the metaproteome of environmental lithobiontic bacterial community colonizing an underground rock rich in light lanthanides. The presented results broaden our understanding of the ecology of XoxF producing bacteria as well as the distribution and diversity of these enzymes in the natural environment.

INFLUENCE OF LIGHT AND HEAVY LANTHANIDES ON THE PHYSIOLOGICAL PROCESSES OF Taraxacum hybernum

The current study was carried out to study the influence of light and heavy lanthanides on the physiological process of Crimean-Sagyz/ Krim-saghyz (dandelion - Taraxacum hybernum). Lanthanide belongs to the group of light or heavy; infiltration of dandelion (Crimean saghyz) seeds with light and heavy lanthanides solutions increased the germination energy by 26%. The differences in the influence of light (cerium) and heavy (lutetium) were manifested in the quantum efficiency change of the photosystem 2 (PS II). Treatment of leaves with high concentrations (100 µM) led to a decrease of Y (II), moreover, under the influence of light lanthanide, the decrease was greater by 21%. It is assumed that the effect of the used lanthanides on the dandelion photosynthetic apparatus is multidirectional. Cerium influenced the PS II antenna complex, and lutetium influenced the reaction centers. A 10-fold decrease in the concentration did not change the nature of cerium action, except that Y (II) was restored already on the second day after treatment. The effect of lutetium became noticeable only by the 8th day after treatment when Y (II) became higher than that of untreated plants. Thus, the results of the study suggested that in dandelion leaves, lanthanides with a concentration of 10 µM increased the quantum efficiency of PS II in contrast to cerium.

Synthesis and characterisation of light lanthanide bis-phospholyl borohydride complexes

Two families of lanthanide(iii) phospholyl borohydride complexes are reported (carbon = grey, hydrogen = white, oxygen = red, boron = yellow, phosphorus = magenta, potassium = blue, lanthanides = teal; only BH4 hydrogens are shown for clarity).

Closing the Circle of the Lanthanide-Murexide Series: Single-Molecule Magnet Behavior and Near-Infrared Emission of the NdIII Derivative

Up to now, even if murexide-based complexometric studies are performed with all 3d or 4f ions, the crystal structures of the light-lanthanide derivatives of the lanthanide-murexide series are unknown. In this work, we report the crystal structure of the NdIII derivative named NdMurex. Contrary to all known complexes of the 3d or 4f series, a dimeric compound was obtained. As for its already reported DyIII and YbIII parents, the NdIII complex responsible for the color-change behaves as a single-molecule magnet (SMM). This behavior was observed on both the crystalline (NdMurex: Ueff = 6.20(0.80) K, 4.31 cm−1; τ0 = 2.20(0.92) × 10−5 s, Hdc = 1200 Oe) and anhydrous form (NdMurexAnhy: Ueff = 6.25(0.90) K, 4.34 cm−1; τ0 = 4.85(0.40) × 10−5 s, Hdc = 1200 Oe). The SMM behavior is reported also for the anhydrous CeIII derivative (CeMurexAnhy: Ueff = 5.40(0.75) K, 3.75 cm−1; τ0 = 3.02(1.10) × 10−5 s, Hdc = 400 Oe). The Near-Infrared Emission NIR emission was observed for NdMurexAnhy and highlights its bifunctionality.

Magnetic anisotropy investigation on light lanthanide complexes

Herein, the magnetic principal axes of a series of light lanthanide based complexes (CeIII, PrIII, NdIII) are characterized by experimental and theoretical approaches.