Burchardt, Leonore

[["dc.bibliographiccitation.artnumber","85"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Bulletin of Volcanology"],["dc.bibliographiccitation.volume","78"],["dc.contributor.author","Berg, S. E."],["dc.contributor.author","Troll, Valentin R."],["dc.contributor.author","Deegan, F. M."],["dc.contributor.author","Burchardt, S."],["dc.contributor.author","Krumbholz, Michael"],["dc.contributor.author","Mancini, L."],["dc.contributor.author","Polacci, M."],["dc.contributor.author","Carracedo, J. C."],["dc.contributor.author","Soler, V."],["dc.contributor.author","Arzilli, F."],["dc.contributor.author","Brun, F."],["dc.date.accessioned","2018-11-07T10:04:42Z"],["dc.date.available","2018-11-07T10:04:42Z"],["dc.date.issued","2016"],["dc.description.abstract","During the first week of the 2011 El Hierro submarine eruption, abundant light-coloured pumiceous, high-silica volcanic bombs coated in dark basanite were found floating on the sea. The composition of the light-coloured frothy material ('xeno-pumice') is akin to that of sedimentary rocks from the region, but the textures resemble felsic magmatic pumice, leaving their exact mode of formation unclear. To help decipher their origin, we investigated representative El Hierro xeno-pumice samples using X-ray computed microtomography for their internal vesicle shapes, volumes, and bulk porosity, as well as for the spatial arrangement and size distributions of vesicles in three dimensions (3D). We find a wide range of vesicle morphologies, which are especially variable around small fragments of rock contained in the xeno-pumice samples. Notably, these rock fragments are almost exclusively of sedimentary origin, and we therefore interpret them as relicts an the original sedimentary ocean crust protolith(s). The irregular vesiculation textures observed probably resulted from pulsatory release of volatiles from multiple sources during xeno-pumice formation, most likely by successive release of pore water and mineral water during incremental heating and decompression of the sedimentary protoliths."],["dc.identifier.doi","10.1007/s00445-016-1080-x"],["dc.identifier.isi","000394130700001"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14358"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38755"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1432-0819"],["dc.relation.issn","0258-8900"],["dc.relation.orgunit","Fakultät für Geowissenschaften und Geographie"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Heterogeneous vesiculation of 2011 El Hierro xeno-pumice revealed by X-ray computed microtomography"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e0190190"],["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","PLOS ONE"],["dc.bibliographiccitation.lastpage","13"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Pfefferle, Dana"],["dc.contributor.author","Plümer, Sina"],["dc.contributor.author","Burchardt, Leonore"],["dc.contributor.author","Treue, Stefan"],["dc.contributor.author","Gail, Alexander"],["dc.contributor.editor","Roques, Pierre"],["dc.date.accessioned","2018-01-17T13:10:07Z"],["dc.date.available","2018-01-17T13:10:07Z"],["dc.date.issued","2018"],["dc.description.abstract","Non-human primates participating in neurophysiological research are exposed to potentially stressful experimental procedures, such as dietary control protocols, surgical implants and their maintenance, or social separation during training and experimental session. Here, we investigated the effect of controlled access to fluid, surgical implants, implant-related cleaning of skin margins, and behavioral training sessions on salivary cortisol levels of adult male rhesus macaques participating in neurophysiological research. The animals were trained to chew flavored cotton swabs to non-invasively collect saliva samples. Our data show no differences in cortisol levels between animals with and without implants, but both, controlled access to fluid and cleaning of implants individually increased salivary cortisol concentrations, while both together did not further increase the concentration. Specifically, before cleaning, individuals with controlled access to fluid had 55% higher cortisol concentrations than individuals with free access to fluid. Under free access to fluid, cortisol concentrations were 27% higher after cleaning while no effect of cleaning was found for individuals under controlled fluid access. Training sessions under controlled access to fluid also did not affect salivary cortisol concentrations. The observed changes in cortisol concentrations represent mild stress responses, as they are only a fraction of the range of the regular circadian changes in cortisol levels in rhesus monkeys. They also indicate that combinations of procedures do not necessarily lead to cumulative stress responses. Our results indicate that salivary cortisol levels of rhesus monkeys respond to neurophysiological experimental procedures and, hence, may be used to assess further refinements of such experimental methods."],["dc.identifier.doi","10.1371/journal.pone.0190190"],["dc.identifier.pmid","29293564"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15070"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/11703"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation.eissn","1932-6203"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Assessment of stress responses in rhesus macaques (Macaca mulatta) to daily routine procedures in system neuroscience based on salivary cortisol concentrations"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","jn.00614.2017"],["dc.bibliographiccitation.journal","Journal of Neurophysiology"],["dc.contributor.author","Berger, Michael"],["dc.contributor.author","Calapai, Antonino"],["dc.contributor.author","Stephan, Valeska"],["dc.contributor.author","Niessing, Michael"],["dc.contributor.author","Burchardt, Leonore"],["dc.contributor.author","Gail, Alexander"],["dc.contributor.author","Treue, Stefan"],["dc.date.accessioned","2018-01-17T13:11:54Z"],["dc.date.available","2018-01-17T13:11:54Z"],["dc.date.issued","2017"],["dc.description.abstract","Teaching non-human primates the complex cognitive behavioral tasks that are central to cognitive neuroscience research is an essential and challenging endeavor. It is crucial for the scientific success that the animals learn to interpret the often complex task rules, and reliably and enduringly act accordingly. To achieve consistent behavior and comparable learning histories across animals, it is desirable to standardize training protocols. Automatizing the training can significantly reduce the time invested by the person training the animal. And self-paced training schedules with individualized learning speeds based on automatic updating of task conditions could enhance the animals' motivation and welfare. We developed a training paradigm for across-task unsupervised training (AUT) of successively more complex cognitive tasks to be administered through a stand-alone housing-based system optimized for rhesus monkeys in neuroscience research settings (Calapai et al. 2016). The AUT revealed inter-individual differences in long-term learning progress between animals, helping to characterize learning personalities, and commonalities, helping to identify easier and more difficult learning steps in the training protocol. Our results demonstrate that (1) rhesus monkeys stay engaged with the AUT over months despite access to water and food outside the experimental sessions, but with lower numbers of interaction compared to conventional fluid-controlled training; (2) with unsupervised training across sessions and task levels, rhesus monkeys can learn tasks of sufficient complexity for state-of-the art cognitive neuroscience in their housing environment; (3) AUT learning progress is primarily determined by the number of interactions with the system rather than the mere exposure time."],["dc.identifier.doi","10.1152/jn.00614.2017"],["dc.identifier.pmid","29142094"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/11705"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.eissn","1522-1598"],["dc.title","Standardized automated training of rhesus monkeys for neuroscience research in their housing environment"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","401"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Solid Earth"],["dc.bibliographiccitation.lastpage","414"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Krumbholz, Michael"],["dc.contributor.author","Bock, M."],["dc.contributor.author","Burchardt, S."],["dc.contributor.author","Kelka, U."],["dc.contributor.author","Vollbrecht, Axel"],["dc.date.accessioned","2018-11-07T09:14:31Z"],["dc.date.available","2018-11-07T09:14:31Z"],["dc.date.issued","2012"],["dc.description.abstract","In recent years, the electromagnetic radiation (EMR) method has been used to detect faults and to determine main horizontal stress directions from variations in intensities and directional properties of electromagnetic emissions, which are assumed to be generated during micro-cracking. Based on a large data set taken from an area of about 250 000 km(2) in Northern Germany, Denmark, and southern Sweden with repeated measurements at one location during a time span of about 1.5 yr, the method was systematically tested. Reproducible observations of temporary changes in the signal patterns, as well as a strongly concentric spatial pattern of the main directions of the magnetic component of the EMR point to very low frequency (VLF) transmitters as the main source and hence raise serious concerns about the applicability of the method to determine recent crustal stresses. We conclude that the EMR method, at its current stage of development, does not allow determination of the main horizontal stress directions."],["dc.description.sponsorship","University of Gottingen"],["dc.identifier.doi","10.5194/se-3-401-2012"],["dc.identifier.isi","000321443000005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27435"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Copernicus Gesellschaft Mbh"],["dc.relation.issn","1869-9510"],["dc.title","A critical discussion of the electromagnetic radiation (EMR) method to determine stress orientations within the crust"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]