Episodes of Early Pleistocene West Antarctic Ice Sheet Retreat Recorded by Iceberg Alley Sediments.

Ice loss in the Southern Hemisphere has been greatest over the past 30 years in West Antarctica. The high sensitivity of this region to climate change has motivated geologists to examine marine sedimentary records for evidence of past episodes of West Antarctic Ice Sheet (WAIS) instability. Sediments accumulating in the Scotia Sea are useful to examine for this purpose because they receive iceberg-rafted debris (IBRD) sourced from the Pacific- and Atlantic-facing sectors of West Antarctica.

Ancient marine sediment DNA reveals diatom transition in Antarctica.

Antarctica is one of the most vulnerable regions to climate change on Earth and studying the past and present responses of this polar marine ecosystem to environmental change is a matter of urgency. Sedimentary ancient DNA (sedaDNA) analysis can provide such insights into past ecosystem-wide changes. Here we present authenticated (through extensive contamination control and sedaDNA damage analysis) metagenomic marine eukaryote sedaDNA from the Scotia Sea region acquired during IODP Expedition 382.

Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years.

The Southern Ocean paleoceanography provides key insights into how iron fertilization and oceanic productivity developed through Pleistocene ice-ages and their role in influencing the carbon cycle. We report a high-resolution record of dust deposition and ocean productivity for the Antarctic Zone, close to the main dust source, Patagonia. Our deep-ocean records cover the last 1.

Identification of Δ6-monounsaturated fatty acids in human hair and nail samples by gas-chromatography-mass-spectrometry using ionic-liquid coated capillary column.

Lipids found in human sebum contain specific fatty acids such as sapienic (cis-6 16:1), cis-8 18:1 and sebaleic (cis-5, cis-8 18:2) acids. These fatty acids belong to the n-10 series and the initial step involved in their synthesis is the desaturation of palmitic acid by the Δ6-desaturase to form sapienic acid. The occurrence in human hair and nail of sapienic (cis-6 16:1), cis-8 18:1 and sebaleic (cis-5, cis-8 18:2) acids has not been reported to our knowledge nor has the formation of Δ6-monounsaturated fatty acids from other saturated fatty acids such as stearic acid.

[Profile and professional expectations for nursing students].

The authors describe the profile corresponding to students enrolled in first, second and third year courses to become registered nurses in Catalonia, along with their professional and job expectations; the authors examine students' perceptions of the university environment. This information will be a great aid to, on the one hand, update the performances and initiatives taken by those responsible for nursing schools, and on the other hand, to obtain a preliminary view on future nursing professionals. At the same time, this information will provide useful elements for students themselves to reflect on their studies and their future as professionals.