Bedrock-Dependent Effects of Climate Change on Terricolous Lichens Along Elevational Gradients in the Alps.

In this study, we focused on the bedrock-dependent effects of climate change on terricolous lichen communities along elevational gradients in the Alps. In particular, we contrasted between carbonatic and siliceous bedrock, hypothesizing more favourable conditions on siliceous than on carbonatic bedrock, where dryer conditions may exacerbate the effects of climate change. To test this hypothesis, we compared terricolous lichen diversity patterns between the two bedrock types in terms of (1) species richness, (2) beta-diversity, (3) proportion of cryophilous species, and (4) functional diversity, also testing the effect of the elevational gradient as a proxy for expected climate warming.

Speciation of Technetium Dibutylphosphate in the Third Phase Formed in the TBP/HNO Solvent Extraction System.

The speciation of technetium in the nitric acid/dibutylphosphoric acid (HDBP)--dodecane system was studied by extended X-ray absorption fine structure (EXAFS) spectroscopy and theoretical methods. Tetravalent technetium, produced by the hydrazine reduction of TcO in 3 M HNO, was extracted by HDBP in -dodecane (30% by volume). During extraction, the splitting of the organic phase into a heavy phase and a light phase was observed.

The Dolichens database: the lichen biota of the Dolomites.

The Dolichens project provides the first dynamic inventory of the lichens of the Dolomites (Eastern Alps, Italy). Occurrence records were retrieved from published and grey literature, reviewed herbaria, unpublished records collected by the authors, and new sampling campaigns, covering a period from 1820 to 2022. Currently, the dataset contains 56,251 records, referring to 1,719 infrageneric taxa, reported from 1820 to 2022, from hilly to nival belts, and corresponding to about half of the species known for the whole Alpine chain.

Structural Investigation of Technetium Dibutylphosphate Species Using X-ray Absorption Fine Structure Spectroscopy.

The speciation of Tc after the extraction of Tc(IV) from HO and 1 M HNO by dibutylphosphoric acid (HDBP) in dodecane has been studied by X-ray absorption fine structure (XAFS) spectroscopy. Results show the formation of dimeric species with TcO and TcO units, and the formulas [TcO(DBP·HDBP)] (1) and [TcO(NO)(DBP)(DBP·HDBP)] (2) were, respectively, proposed for the species extracted from HO and 1 M HNO. The interatomic Tc-Tc distances found in the TcO and TcO units [2.