Publications by authors named "K Kjeldsen"
Southeast Greenland contributes significantly to global sea level rise, with mass loss having increased by about 600% over the past 30 years due to enhanced melt and dynamic instabilities of marine-terminating glaciers. Accurate modelling of glacier dynamics is crucial to minimise uncertainties in predictions of future sea level rise, necessitating detailed reconstructions of long-term glacial histories. One key complexity in these models that is not well understood or documented is ice flow piracy, where ice is redirected between catchment basins, significantly influencing regional glacier dynamics and mass balance.
View Article and Find Full Text PDFThis paper introduces a comprehensive protocol leveraging open-access techniques to create small- to medium-scale 3D representations of the environment by using iPhone and iPad light detection and ranging (LiDAR). The protocol focuses on two capabilities of the iPhone LiDAR. The first capability is 3D modeling: iPhone LiDAR rapidly generates detailed indoor and outdoor 3D models, providing insights into object size, volume and geometry.
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- Recent discoveries reveal novel archaea clades, known as anaerobic multicarbon alkane-oxidizing archaea (ANKA), capable of oxidizing a range of higher alkanes, from ethane to longer-chain alkanes like hexadecane.
- These archaea utilize alkyl-coenzyme M reductases, similar to those found in other methanogenic archaea, leading to complex degradation pathways that vary with alkane chain length.
- The review discusses the evolution of these pathways, the role of lateral gene transfer, and the interactions between alkane-oxidizing archaea and sulfate-reducing bacteria (SRB), while emphasizing the need for further research and potential biotechnological applications.
The major input of mercury (Hg) to the Arctic is normally ascribed to long-range transport of anthropogenic Hg emissions. Recently, alarming concentrations of Hg in meltwater from the Greenland Ice Sheet (GrIS) were reported with bedrock as the proposed source. Reported Hg concentrations were 100 to 1000 times higher than in known freshwater systems of Greenland, calling for independent validation of the extraordinary concentrations and conclusions.
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- - A study involving 300 pigs aimed to assess how different levels of vitamin E and its partial replacement with a polyphenol affect growth, blood count, and specific serum markers over a 42-day period.
- - Five dietary treatments were analyzed, including a control with 15 IU/kg of vitamin E and variations that added or replaced vitamin E with polyphenol, including a high vitamin E treatment to test for any adverse effects.
- - Results indicated that higher vitamin E levels improved the gain-to-feed ratio and serum SOD activity in pigs, highlighting a potential benefit of vitamin E supplementation in pig diets.