Base de dados : MEDLINE
Pesquisa : E05.799.669 [Categoria DeCS]
Referências encontradas : 463 [refinar]
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  1 / 463 MEDLINE  
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[PMID]:29321473
[Au] Autor:Zobel M; Davison J; Edwards ME; Brochmann C; Coissac E; Taberlet P; Willerslev E; Moora M
[Ad] Endereço:Department of Botany, Institute of Ecology and Earth Sciences, University of Tartu, 40 Lai Street, 51005, Tartu, Estonia.
[Ti] Título:Ancient environmental DNA reveals shifts in dominant mutualisms during the late Quaternary.
[So] Source:Nat Commun;9(1):139, 2018 01 10.
[Is] ISSN:2041-1723
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:DNA-based snapshots of ancient vegetation have shown that the composition of high-latitude plant communities changed considerably during the late Quaternary. However, parallel changes in biotic interactions remain largely uninvestigated. Here we show how mutualisms involving plants and heterotrophic organisms varied during the last 50,000 years. During 50-25 ka BP, a cool period featuring stadial-interstadial fluctuations, arbuscular mycorrhizal and non-N-fixing plants predominated. During 25-15 ka BP, a cold, dry interval, the representation of ectomycorrhizal, non-mycorrhizal and facultatively mycorrhizal plants increased, while that of N-fixing plants decreased further. From 15 ka BP, which marks the transition to and establishment of the Holocene interglaciation, representation of arbuscular mycorrhizal plants decreased further, while that of ectomycorrhizal, non-mycorrhizal, N-fixing and wind-pollinated plants increased. These changes in the mutualist trait structure of vegetation may reflect responses to historical environmental conditions that are without current analogue, or biogeographic processes, such as spatial decoupling of mutualist partners.
[Mh] Termos MeSH primário: Evolução Biológica
DNA Antigo/análise
Micorrizas/genética
Plantas/genética
Simbiose
[Mh] Termos MeSH secundário: Ciclo do Carbono/fisiologia
Dióxido de Carbono/química
Dióxido de Carbono/metabolismo
Clima
Ecossistema
Meio Ambiente
História Antiga
Micorrizas/classificação
Nitrogênio/química
Nitrogênio/metabolismo
Fixação de Nitrogênio/fisiologia
Plantas/classificação
Polinização/fisiologia
Datação Radiométrica
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Ancient); 142M471B3J (Carbon Dioxide); N762921K75 (Nitrogen)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180222
[Lr] Data última revisão:
180222
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180112
[St] Status:MEDLINE
[do] DOI:10.1038/s41467-017-02421-3


  2 / 463 MEDLINE  
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[PMID]:29351329
[Au] Autor:Carleton WC; Campbell D; Collard M
[Ad] Endereço:Department of Archaeology, Simon Fraser University,University Drive, Burnaby, British Columbia, Canada.
[Ti] Título:Radiocarbon dating uncertainty and the reliability of the PEWMA method of time-series analysis for research on long-term human-environment interaction.
[So] Source:PLoS One;13(1):e0191055, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Statistical time-series analysis has the potential to improve our understanding of human-environment interaction in deep time. However, radiocarbon dating-the most common chronometric technique in archaeological and palaeoenvironmental research-creates challenges for established statistical methods. The methods assume that observations in a time-series are precisely dated, but this assumption is often violated when calibrated radiocarbon dates are used because they usually have highly irregular uncertainties. As a result, it is unclear whether the methods can be reliably used on radiocarbon-dated time-series. With this in mind, we conducted a large simulation study to investigate the impact of chronological uncertainty on a potentially useful time-series method. The method is a type of regression involving a prediction algorithm called the Poisson Exponentially Weighted Moving Average (PEMWA). It is designed for use with count time-series data, which makes it applicable to a wide range of questions about human-environment interaction in deep time. Our simulations suggest that the PEWMA method can often correctly identify relationships between time-series despite chronological uncertainty. When two time-series are correlated with a coefficient of 0.25, the method is able to identify that relationship correctly 20-30% of the time, providing the time-series contain low noise levels. With correlations of around 0.5, it is capable of correctly identifying correlations despite chronological uncertainty more than 90% of the time. While further testing is desirable, these findings indicate that the method can be used to test hypotheses about long-term human-environment interaction with a reasonable degree of confidence.
[Mh] Termos MeSH primário: Radioisótopos de Carbono/análise
Meio Ambiente
Datação Radiométrica/métodos
Incerteza
[Mh] Termos MeSH secundário: Seres Humanos
Reprodutibilidade dos Testes
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Carbon Radioisotopes)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180221
[Lr] Data última revisão:
180221
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180120
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191055


  3 / 463 MEDLINE  
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[PMID]:29281669
[Au] Autor:Finné M; Holmgren K; Shen CC; Hu HM; Boyd M; Stocker S
[Ad] Endereço:Department of Archaeology and Ancient History, Uppsala University, Uppsala, Sweden.
[Ti] Título:Late Bronze Age climate change and the destruction of the Mycenaean Palace of Nestor at Pylos.
[So] Source:PLoS One;12(12):e0189447, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:This paper offers new high-resolution oxygen and carbon isotope data from Stalagmite S1 from Mavri Trypa Cave, SW Peloponnese. Our data provide the climate background to the destruction of the nearby Mycenaean Palace of Nestor at Pylos at the transition from Late Helladic (LH) IIIB to LH IIIC, ~3150-3130 years before present (before AD 1950, hereafter yrs BP) and the subsequent period. S1 is dated by 24 U-Th dates with an averaged precision of ±26 yrs (2σ), providing one of the most robust paleoclimate records from the eastern Mediterranean for the end of the Late Bronze Age (LBA). The δ18O record shows generally wetter conditions at the time when the Palace of Nestor at Pylos was destroyed, but a brief period of drier conditions around 3200 yrs BP may have disrupted the Mycenaean agricultural system that at the time was likely operating close to its limit. Gradually developing aridity after 3150 yrs BP, i.e. subsequent to the destruction, probably reduced crop yields and helped to erode the basis for the reinstitution of a central authority and the Palace itself.
[Mh] Termos MeSH primário: Arqueologia
Mudança Climática
[Mh] Termos MeSH secundário: Fósseis
Grécia
Datação Radiométrica
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180129
[Lr] Data última revisão:
180129
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171228
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189447


  4 / 463 MEDLINE  
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[PMID]:29210235
[Au] Autor:Millar CI; Heckman K; Swanston C; Schmidt K; Westfall RD; Delany DL
[Ti] Título:Radiocarbon dating of American pika fecal pellets provides insights into population extirpations and climate refugia.
[So] Source:Ecol Appl;24(7):1748-68, 2014.
[Is] ISSN:1051-0761
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The American pika (Ochotona princeps) has become a species of concern for its sensitivity to warm temperatures and potential vulnerability to global warming. We explored the value of radiocarbon dating of fecal pellets to address questions of population persistence and timing of site extirpation. Carbon was extracted from pellets collected at 43 locations in the western Great Basin, USA, including three known occupied sites and 40 sites of uncertain status at range margins or where previous studies indicated the species is vulnerable. We resolved calibrated dates with high precision (within several years), most of which fell in the period of the mid-late 20th century bomb curve. The two-sided nature of the bomb curve renders far- and near-side dates of equal probability, which are separated by one to four decades. We document methods for narrowing resolution to one age range, including stratigraphic analysis of vegetation collected from pika haypiles. No evidence was found for biases in atmospheric 14C levels due to fossil-derived or industrial CO2 contamination. Radiocarbon dating indicated that pellets can persist for >59 years; known occupied sites resolved contemporary dates. Using combined evidence from field observations and radiocarbon dating, and the Bodie Mountains as an example, we propose a historical biogeographic scenario for pikas in minor Great Basin mountain ranges adjacent to major cordillera, wherein historical climate variability led to cycles of extirpation and recolonization during alternating cool and warm centuries. Using this model to inform future dynamics for small ranges in biogeographic settings similar to the Bodie Mountains in California, extirpation of pikas appears highly likely under directional warming trends projected for the next century, even while populations in extensive cordillera (e.g., Sierra Nevada, Rocky Mountains, Cascade Range) are likely to remain viable due to extensive, diverse habitat and high connectivity.
[Mh] Termos MeSH primário: Distribuição Animal
Clima
Lagomorpha/fisiologia
Datação Radiométrica/veterinária
[Mh] Termos MeSH secundário: Animais
California
Nevada
Oregon
Dinâmica Populacional
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180108
[Lr] Data última revisão:
180108
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171207
[St] Status:MEDLINE


  5 / 463 MEDLINE  
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[PMID]:28880302
[Au] Autor:Callaway E
[Ti] Título:Skeleton plundered from Mexican cave was one of the Americas' oldest.
[So] Source:Nature;549(7670):14-15, 2017 08 30.
[Is] ISSN:1476-4687
[Cp] País de publicação:England
[La] Idioma:eng
[Mh] Termos MeSH primário: Carbonato de Cálcio/química
Cavernas
Datação Radiométrica/métodos
Esqueleto
Roubo
[Mh] Termos MeSH secundário: Arqueologia/métodos
DNA Antigo/análise
DNA Antigo/isolamento & purificação
Seres Humanos
Índios Centro-Americanos
Índios Norte-Americanos
Masculino
México
Montana
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Ancient); H0G9379FGK (Calcium Carbonate)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170915
[Lr] Data última revisão:
170915
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170908
[St] Status:MEDLINE
[do] DOI:10.1038/nature.2017.22521


  6 / 463 MEDLINE  
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[PMID]:28854194
[Au] Autor:Stinnesbeck W; Becker J; Hering F; Frey E; González AG; Fohlmeister J; Stinnesbeck S; Frank N; Terrazas Mata A; Benavente ME; Avilés Olguín J; Aceves Núñez E; Zell P; Deininger M
[Ad] Endereço:Institut für Geowissenschaften, Universität Heidelberg, Im Neuenheimer Feld 234, Heidelberg, Germany.
[Ti] Título:The earliest settlers of Mesoamerica date back to the late Pleistocene.
[So] Source:PLoS One;12(8):e0183345, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Preceramic human skeletal remains preserved in submerged caves near Tulum in the Mexican state of Quintana Roo, Mexico, reveal conflicting results regarding 14C dating. Here we use U-series techniques for dating a stalagmite overgrowing the pelvis of a human skeleton discovered in the submerged Chan Hol cave. The oldest closed system U/Th age comes from around 21 mm above the pelvis defining the terminus ante quem for the pelvis to 11311±370 y BP. However, the skeleton might be considerable older, probably as old as 13 ky BP as indicated by the speleothem stable isotope data. The Chan Hol individual confirms a late Pleistocene settling of Mesoamerica and represents one of the oldest human osteological remains in America.
[Mh] Termos MeSH primário: Cavernas
Fósseis
Paleontologia/métodos
Datação Radiométrica/métodos
[Mh] Termos MeSH secundário: Radioisótopos de Carbono/metabolismo
Seres Humanos
México
Pelve/anatomia & histologia
Esqueleto/anatomia & histologia
Tório/metabolismo
Fatores de Tempo
Urânio/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Carbon Radioisotopes); 4OC371KSTK (Uranium); 60YU5MIG9W (Thorium)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170831
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0183345


  7 / 463 MEDLINE  
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[PMID]:28817590
[Au] Autor:Prendergast ME; Buckley M; Crowther A; Frantz L; Eager H; Lebrasseur O; Hutterer R; Hulme-Beaman A; Van Neer W; Douka K; Veall MA; Quintana Morales EM; Schuenemann VJ; Reiter E; Allen R; Dimopoulos EA; Helm RM; Shipton C; Mwebi O; Denys C; Horton M; Wynne-Jones S; Fleisher J; Radimilahy C; Wright H; Searle JB; Krause J; Larson G; Boivin NL
[Ad] Endereço:Radcliffe Institute for Advanced Study, Harvard University, Cambridge, MA, United States of America.
[Ti] Título:Reconstructing Asian faunal introductions to eastern Africa from multi-proxy biomolecular and archaeological datasets.
[So] Source:PLoS One;12(8):e0182565, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Human-mediated biological exchange has had global social and ecological impacts. In sub-Saharan Africa, several domestic and commensal animals were introduced from Asia in the pre-modern period; however, the timing and nature of these introductions remain contentious. One model supports introduction to the eastern African coast after the mid-first millennium CE, while another posits introduction dating back to 3000 BCE. These distinct scenarios have implications for understanding the emergence of long-distance maritime connectivity, and the ecological and economic impacts of introduced species. Resolution of this longstanding debate requires new efforts, given the lack of well-dated fauna from high-precision excavations, and ambiguous osteomorphological identifications. We analysed faunal remains from 22 eastern African sites spanning a wide geographic and chronological range, and applied biomolecular techniques to confirm identifications of two Asian taxa: domestic chicken (Gallus gallus) and black rat (Rattus rattus). Our approach included ancient DNA (aDNA) analysis aided by BLAST-based bioinformatics, Zooarchaeology by Mass Spectrometry (ZooMS) collagen fingerprinting, and direct AMS (accelerator mass spectrometry) radiocarbon dating. Our results support a late, mid-first millennium CE introduction of these species. We discuss the implications of our findings for models of biological exchange, and emphasize the applicability of our approach to tropical areas with poor bone preservation.
[Mh] Termos MeSH primário: Espécies Introduzidas/história
[Mh] Termos MeSH secundário: África
Animais
Animais Domésticos/genética
Arqueologia
Ásia
Galinhas
Colágeno/análise
Colágeno/genética
Impressões Digitais de DNA
História Antiga
Datação Radiométrica
Ratos
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE
[Nm] Nome de substância:
9007-34-5 (Collagen)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171006
[Lr] Data última revisão:
171006
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170818
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0182565


  8 / 463 MEDLINE  
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[PMID]:28723924
[Au] Autor:Alcaraz-Castaño M; Alcolea-González J; Kehl M; Albert RM; Baena-Preysler J; de Balbín-Behrmann R; Cuartero F; Cuenca-Bescós G; Jiménez-Barredo F; López-Sáez JA; Piqué R; Rodríguez-Antón D; Yravedra J; Weniger GC
[Ad] Endereço:Neanderthal Museum, Mettmann, Germany.
[Ti] Título:A context for the last Neandertals of interior Iberia: Los Casares cave revisited.
[So] Source:PLoS One;12(7):e0180823, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:INTRODUCTION AND OBJECTIVES: Although the Iberian Peninsula is a key area for understanding the Middle to Upper Paleolithic transition and the demise of the Neandertals, valuable evidence for these debates remains scarce and problematic in its interior regions. Sparse data supporting a late Neandertal persistence in the Iberian interior have been recently refuted and hence new evidence is needed to build new models on the timing and causes of Neandertal disappearance in inland Iberia and the whole peninsula. In this study we provide new evidence from Los Casares, a cave located in the highlands of the Spanish Meseta, where a Neandertal-associated Middle Paleolithic site was discovered and first excavated in the 1960's. Our main objective is twofold: (1) provide an updated geoarcheological, paleoenvironmental and chronological framework for this site, and (2) discuss obtained results in the context of the time and nature of the last Neandertal presence in Iberia. METHODS: We conducted new fieldwork in an interior chamber of Los Casares cave named 'Seno A'. Our methods included micromorphology, sedimentology, radiocarbon dating, Uranium/Thorium dating, palinology, microfaunal analysis, anthracology, phytolith analysis, archeozoology and lithic technology. Here we present results on site formation processes, paleoenvironment and the chronological setting of the Neandertal occupation at Los Casares cave-Seno A. RESULTS AND DISCUSSION: The sediment sequence reveals a mostly in situ archeological deposit containing evidence of both Neandertal activity and carnivore action in level c, dated to 44,899-42,175 calendar years ago. This occupation occurred during a warm and humid interval of Marine Isotopic Stage 3, probably correlating with Greenland Interstadial 11, representing one of the latest occurrences of Neandertals in the Iberian interior. However, overlying layer b records a deterioration of local environments, thus providing a plausible explanation for the abandonment of the site, and perhaps for the total disappearance of Neandertals of the highlands of inland Iberia during subsequent Greenland Stadials 11 or 10, or even Heinrich Stadial 4. Since layer b provided very few signs of human activity and no reliable chronometric results, and given the scarce chronostratigrapic evidence recorded so far for this period in interior Iberia, this can only be taken as a working hypothesis to be tested with future research. Meanwhile, 42,000 calendar years ago remains the most plausible date for the abandonment of interior Iberia by Neandertals, possibly due to climate deterioration. Currently, a later survival of this human species in Iberia is limited to the southern coasts.
[Mh] Termos MeSH primário: Arqueologia
Fósseis
Homem de Neandertal
[Mh] Termos MeSH secundário: Animais
Cavernas
Clima
Datação Radiométrica
Espanha
Tecnologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170926
[Lr] Data última revisão:
170926
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170721
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0180823


  9 / 463 MEDLINE  
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[PMID]:28700595
[Au] Autor:de Oliveira Junior JC; Beirigo RM; Chiapini M; do Nascimento AF; Couto EG; Vidal-Torrado P
[Ad] Endereço:Department of Agronomy, Federal University of Technology-Parana, Dois Vizinhos, Parana, Brazil.
[Ti] Título:Origin of mounds in the Pantanal wetlands: An integrated approach between geomorphology, pedogenesis, ecology and soil micromorphology.
[So] Source:PLoS One;12(7):e0179197, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Vegetated mounds are an important geomorphological feature of the Pantanal, where the influence of floods dictates not only hydropedological processes, but also the distribution and ecology of the flora and fauna. This work aimed to identify factors and processes that influence the formation and spatial distribution of the mounds, which are commonly associated with termite activity. In order to characterize pedological processes, macro and micro morphological descriptions, satellite image interpretation, dating of the sandy sedimentary material using OSL and carbon dating using 14C AMS were carried out. This dating of the materials indicates that the sediments in which the soils were formed were deposited during the Pleistocene, while the carbonates are from the Holocene. The basin-like format of the laminar structures suggests that part of the more clayey material was deposited in lacustrine environments. The more humid climate in the Holocene intensified argilluviation, which at an advanced stage, led to a more pronounced textural gradient, reducing drainage and leading to ferrolysis and thickening of the E horizon. Besides pedogenic processes, more erosive flooding during the Holocene began reducing and rounding the landscape's more elevated structures (paleolevees). In the final stage, these structures were occupied by termites to shelter from flooding. Thereafter, the bio-cementation action of the termite nests has increased the resistance of the vegetated mounds to processes of erosion.
[Mh] Termos MeSH primário: Sedimentos Geológicos/química
Isópteros/fisiologia
Datação Radiométrica/métodos
Imagens de Satélites/métodos
Solo/química
Zonas Úmidas
[Mh] Termos MeSH secundário: Animais
Brasil
Fenômenos Geológicos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170713
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0179197


  10 / 463 MEDLINE  
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[PMID]:28678801
[Au] Autor:Artioli G; Angelini I; Kaufmann G; Canovaro C; Dal Sasso G; Villa IM
[Ad] Endereço:Department of Geosciences, Università di Padova, Padova, Italy.
[Ti] Título:Long-distance connections in the Copper Age: New evidence from the Alpine Iceman's copper axe.
[So] Source:PLoS One;12(7):e0179263, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:25 years after the discovery in the Ötztal Italian Alps, the 5,300-year-old mummy keeps providing key information on human biological and medical conditions, aspects of everyday life and societal organization in the Copper Age. The hand axe found with the body of the Alpine Iceman is one of the rare copper objects that is firmly dated to the early Copper Age because of the radiocarbon dating of the axe wooden shaft. Here we report the measurement of the lead isotope ratios of the copper blade. The results unambiguously indicate that the source of the metal is the ore-rich area of Southern Tuscany, despite ample evidence that Alpine copper ore sources were known and exploited at the time. The experimental results are discussed within the framework of all the available coeval archaeometallurgical data in Central-Southern Europe: they show that the Alps were a neat cultural barrier separating distinct metal circuits. The direct evidence of raw metal or object movement between Central Italy and the Alps is surprising and provides a new perspective on long-distance relocation of goods and relationships between the early Copper Age cultures in the area. The result is in line with the recent investigations re-evaluating the timing and extent of copper production in Central Italy in the 4th millennium BC.
[Mh] Termos MeSH primário: Cobre/análise
Múmias
Datação Radiométrica/métodos
Armas
[Mh] Termos MeSH secundário: Altitude
Áustria
Cobre/química
Seres Humanos
Gelo
Itália
Metalurgia/métodos
Paleontologia/métodos
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ice); 789U1901C5 (Copper)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171006
[Lr] Data última revisão:
171006
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170706
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0179263



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