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Kenneth Ritchie - One of the best experts on this subject based on the ideXlab platform.
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carbon and nitrogen stable isotope values in freshwater brackish and marine fish bone collagen from mesolithic and neolithic sites in central and northern europe
Environmental Archaeology, 2016Co-Authors: Harry K Robson, Soren H Andersen, Leon J Clarke, Oliver E Craig, Kurt J Gron, Andrew K G Jones, Per Karsten, Nicky Milner, Douglas T Price, Kenneth RitchieAbstract:The aim of this research is to examine the isotopic characterisation of archaeological fish species as it relates to freshwater, brackish and marine environments, trophic level and migration patterns, and to determine intraspecies variation within and between fish populations in different locations within central and northern Europe. Carbon and nitrogen stable isotope analysis was undertaken on collagen extracted from 72 fish bone samples from eight Mesolithic and Neolithic archaeological sites in this region. Thirty-six (50%) of the specimens analysed produced results with acceptable carbon to nitrogen atomic ratios (2·9–3·6). The fish remains encompassed a wide spectrum of freshwater, brackish and marine taxa (n = 12), which were reflected in the δ13C values (−24·5 to −7·8‰). The freshwater/brackish fish (pike, Esox lucius; perch, Perca fluviatilis; Zander, Sander lucioperca) had δ13C values that ranged from −24·2 to −19·3‰, whereas the brackish/marine fish (spurdog, Squalus acanthias; flatfish, Pleuron...
Jingnan Guo - One of the best experts on this subject based on the ideXlab platform.
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the lunar lander neutron and dosimetry lnd experiment on chang e 4
Space Science Reviews, 2020Co-Authors: Robert F Wimmerschweingruber, S Bottcher, Shenyi Zhang, S Burmeister, H Lohf, Jingnan Guo, Bjorn SchusterAbstract:Chang’E 4 is the first mission to the far side of the Moon and consists of a lander, a rover, and a relay spacecraft. Lander and rover were launched at 18:23 UTC on December 7, 2018 and landed in the von Karman crater at 02:26 UTC on January 3, 2019. Here we describe the Lunar Lander Neutron & Dosimetry experiment (LND) which is part of the Chang’E 4 Lander scientific payload. Its chief scientific goal is to obtain first active dosimetric measurements on the surface of the Moon. LND also provides observations of fast neutrons which are a result of the interaction of high-energy particle radiation with the lunar regolith and of their thermalized counterpart, thermal neutrons, which are a sensitive indicator of subsurface water content.
Robert F Wimmerschweingruber - One of the best experts on this subject based on the ideXlab platform.
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the lunar lander neutron and dosimetry lnd experiment on chang e 4
Space Science Reviews, 2020Co-Authors: Robert F Wimmerschweingruber, S Bottcher, Shenyi Zhang, S Burmeister, H Lohf, Jingnan Guo, Bjorn SchusterAbstract:Chang’E 4 is the first mission to the far side of the Moon and consists of a lander, a rover, and a relay spacecraft. Lander and rover were launched at 18:23 UTC on December 7, 2018 and landed in the von Karman crater at 02:26 UTC on January 3, 2019. Here we describe the Lunar Lander Neutron & Dosimetry experiment (LND) which is part of the Chang’E 4 Lander scientific payload. Its chief scientific goal is to obtain first active dosimetric measurements on the surface of the Moon. LND also provides observations of fast neutrons which are a result of the interaction of high-energy particle radiation with the lunar regolith and of their thermalized counterpart, thermal neutrons, which are a sensitive indicator of subsurface water content.
B Krawczyk - One of the best experts on this subject based on the ideXlab platform.
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systematic position of copepods of the genus achtheres crustacea copepoda siphonostomatoida parasitizing perch perca fluviatilis l and Zander sander lucioperca l
Journal of Fish Diseases, 2006Co-Authors: J Kempter, Wojciech Piasecki, K Wieski, B KrawczykAbstract:Parasitic copepods of the genus Achtheres commonly infect perch, Perca fluviatilis, and Zander, Sander lucioperca, in Europe. The aim of this study was to verify the specific identity of these copepods. The parasites were examined morphologically, biometrically and genetically. Statistical processing of the biometrical data was based on both empirical measurements and transformed data related to total length and genital trunk width. Principal component analysis was applied to both sets of data. DNA of both parasite 'forms' was amplified using two sets of primers (EU5.8S+EU18S and 18SF1+28SR) and the products were subjected to restriction fragment length polymorphism (RFLP). Morphological differences were found in the overall shape of the copepod bodies as well as in the details of the armament of some appendages. The morphometric study emphasized the importance of second maxillae and genital process as the variables most distinctly distinguishing the two 'forms'. The two 'forms' of Achtheres differed in the DNA sequence amplified by one set of primers. RFLP revealed even more extensive differences between these two copepods. We concluded that the copepods parasitizing perch should be referred to as Achtheres percarum von Nordmann, 1832, whereas a long-forgotten name, A. sandrae Gadd, 1901, should be applied to the copepods from Zander.
Bjorn Schuster - One of the best experts on this subject based on the ideXlab platform.
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the lunar lander neutron and dosimetry lnd experiment on chang e 4
Space Science Reviews, 2020Co-Authors: Robert F Wimmerschweingruber, S Bottcher, Shenyi Zhang, S Burmeister, H Lohf, Jingnan Guo, Bjorn SchusterAbstract:Chang’E 4 is the first mission to the far side of the Moon and consists of a lander, a rover, and a relay spacecraft. Lander and rover were launched at 18:23 UTC on December 7, 2018 and landed in the von Karman crater at 02:26 UTC on January 3, 2019. Here we describe the Lunar Lander Neutron & Dosimetry experiment (LND) which is part of the Chang’E 4 Lander scientific payload. Its chief scientific goal is to obtain first active dosimetric measurements on the surface of the Moon. LND also provides observations of fast neutrons which are a result of the interaction of high-energy particle radiation with the lunar regolith and of their thermalized counterpart, thermal neutrons, which are a sensitive indicator of subsurface water content.
