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Sample records for ancient dna authenticity

  1. Authenticity in ancient DNA studies

    DEFF Research Database (Denmark)

    Gilbert, M Thomas P; Willerslev, Eske

    2006-01-01

    Ancient DNA studies represent a powerful tool that can be used to obtain genetic insights into the past. However, despite the publication of large numbers of apparently successful ancient DNA studies, a number of problems exist with the field that are often ignored. Therefore, questions exist...... as to how reliable the conclusions of many of the published studies are. In this paper we outline first the problems associated with aDNA studies, and secondly present potential guidelines designed so as to enable non-specialist readers the opportunity to critically assess the quality of aDNA publications....

  2. More on contamination: the use of asymmetric molecular behavior to identify authentic ancient human DNA

    DEFF Research Database (Denmark)

    Malmström, Helena; Svensson, Emma M; Gilbert, M Thomas P

    2007-01-01

    so, we also produce data that describes the efficiency of bleach incubation of bone powder and its relative detrimental effects on contaminant and authentic ancient DNA. We note that bleach treatment is significantly more detrimental to contaminant than to authentic aDNA in the bleached bone powder...

  3. Ancient DNA

    DEFF Research Database (Denmark)

    Willerslev, Eske; Cooper, Alan

    2004-01-01

    ancient DNA, palaeontology, palaeoecology, archaeology, population genetics, DNA damage and repair......ancient DNA, palaeontology, palaeoecology, archaeology, population genetics, DNA damage and repair...

  4. Contesting the presence of wheat in the British Isles 8,000 years ago by assessing ancient DNA authenticity from low-coverage data.

    Science.gov (United States)

    Weiß, Clemens L; Dannemann, Michael; Prüfer, Kay; Burbano, Hernán A

    2015-11-03

    Contamination with exogenous DNA is a constant hazard to ancient DNA studies, since their validity greatly depend on the ancient origin of the retrieved sequences. Since contamination occurs sporadically, it is fundamental to show positive evidence for the authenticity of ancient DNA sequences even when preventive measures to avoid contamination are implemented. Recently the presence of wheat in the United Kingdom 8000 years before the present has been reported based on an analysis of sedimentary ancient DNA (Smith et al. 2015). Smith et al. did not present any positive evidence for the authenticity of their results due to the small number of sequencing reads that were confidently assigned to wheat. We developed a computational method that compares postmortem damage patterns of a test dataset with bona fide ancient and modern DNA. We applied this test to the putative wheat DNA and find that these reads are most likely not of ancient origin.

  5. Mitogenomic analyses from ancient DNA

    DEFF Research Database (Denmark)

    Paijmans, Johanna L. A.; Gilbert, Tom; Hofreiter, Michael

    2013-01-01

    The analysis of ancient DNA is playing an increasingly important role in conservation genetic, phylogenetic and population genetic analyses, as it allows incorporating extinct species into DNA sequence trees and adds time depth to population genetics studies. For many years, these types of DNA...... analyses (whether using modern or ancient DNA) were largely restricted to the analysis of short fragments of the mitochondrial genome. However, due to many technological advances during the past decade, a growing number of studies have explored the power of complete mitochondrial genome sequences...... (mitogenomes). Such studies were initially limited to analyses of extant organisms, but developments in both DNA sequencing technologies and general methodological aspects related to working with degraded DNA have resulted in complete mitogenomes becoming increasingly popular for ancient DNA studies as well...

  6. Authentication of forensic DNA samples.

    Science.gov (United States)

    Frumkin, Dan; Wasserstrom, Adam; Davidson, Ariane; Grafit, Arnon

    2010-02-01

    Over the past twenty years, DNA analysis has revolutionized forensic science, and has become a dominant tool in law enforcement. Today, DNA evidence is key to the conviction or exoneration of suspects of various types of crime, from theft to rape and murder. However, the disturbing possibility that DNA evidence can be faked has been overlooked. It turns out that standard molecular biology techniques such as PCR, molecular cloning, and recently developed whole genome amplification (WGA), enable anyone with basic equipment and know-how to produce practically unlimited amounts of in vitro synthesized (artificial) DNA with any desired genetic profile. This artificial DNA can then be applied to surfaces of objects or incorporated into genuine human tissues and planted in crime scenes. Here we show that the current forensic procedure fails to distinguish between such samples of blood, saliva, and touched surfaces with artificial DNA, and corresponding samples with in vivo generated (natural) DNA. Furthermore, genotyping of both artificial and natural samples with Profiler Plus((R)) yielded full profiles with no anomalies. In order to effectively deal with this problem, we developed an authentication assay, which distinguishes between natural and artificial DNA based on methylation analysis of a set of genomic loci: in natural DNA, some loci are methylated and others are unmethylated, while in artificial DNA all loci are unmethylated. The assay was tested on natural and artificial samples of blood, saliva, and touched surfaces, with complete success. Adopting an authentication assay for casework samples as part of the forensic procedure is necessary for maintaining the high credibility of DNA evidence in the judiciary system.

  7. Ancient DNA from marine mammals

    DEFF Research Database (Denmark)

    Foote, Andrew David; Hofreiter, Michael; Morin, Philip A.

    2012-01-01

    discuss studies recon- structing inter- and intra-specific phylogenies from aDNA sequences and discuss how aDNA sequences could be used to estimate mutation rates. Finally, we highlight some of the problems of aDNA studies on marine mammals, such as obtaining sufficient sample sizes and calibrating...... such as bone, tooth, baleen, skin, fur, whiskers and scrimshaw using ancient DNA (aDNA) approaches provide an oppor- tunity for investigating such changes over evolutionary and ecological timescales. Here, we review the application of aDNA techniques to the study of marine mammals. Most of the studies have...... focused on detecting changes in genetic diversity following periods of exploitation and environmental change. To date, these studies have shown that even small sample sizes can provide useful information on historical genetic diversity. Ancient DNA has also been used in investigations of changes...

  8. Ancient bacteria show evidence of DNA repair

    DEFF Research Database (Denmark)

    Johnson, Sarah Stewart; Hebsgaard, Martin B; Christensen, Torben R

    2007-01-01

    Recent claims of cultivable ancient bacteria within sealed environments highlight our limited understanding of the mechanisms behind long-term cell survival. It remains unclear how dormancy, a favored explanation for extended cellular persistence, can cope with spontaneous genomic decay over......-term survival of bacteria sealed in frozen conditions for up to one million years. Our results show evidence of bacterial survival in samples up to half a million years in age, making this the oldest independently authenticated DNA to date obtained from viable cells. Additionally, we find strong evidence...... that this long-term survival is closely tied to cellular metabolic activity and DNA repair that over time proves to be superior to dormancy as a mechanism in sustaining bacteria viability....

  9. Ancient and modern environmental DNA

    Science.gov (United States)

    Pedersen, Mikkel Winther; Overballe-Petersen, Søren; Ermini, Luca; Sarkissian, Clio Der; Haile, James; Hellstrom, Micaela; Spens, Johan; Thomsen, Philip Francis; Bohmann, Kristine; Cappellini, Enrico; Schnell, Ida Bærholm; Wales, Nathan A.; Carøe, Christian; Campos, Paula F.; Schmidt, Astrid M. Z.; Gilbert, M. Thomas P.; Hansen, Anders J.; Orlando, Ludovic; Willerslev, Eske

    2015-01-01

    DNA obtained from environmental samples such as sediments, ice or water (environmental DNA, eDNA), represents an important source of information on past and present biodiversity. It has revealed an ancient forest in Greenland, extended by several thousand years the survival dates for mainland woolly mammoth in Alaska, and pushed back the dates for spruce survival in Scandinavian ice-free refugia during the last glaciation. More recently, eDNA was used to uncover the past 50 000 years of vegetation history in the Arctic, revealing massive vegetation turnover at the Pleistocene/Holocene transition, with implications for the extinction of megafauna. Furthermore, eDNA can reflect the biodiversity of extant flora and fauna, both qualitatively and quantitatively, allowing detection of rare species. As such, trace studies of plant and vertebrate DNA in the environment have revolutionized our knowledge of biogeography. However, the approach remains marred by biases related to DNA behaviour in environmental settings, incomplete reference databases and false positive results due to contamination. We provide a review of the field. PMID:25487334

  10. Phylogenetic estimation of timescales using ancient DNA

    DEFF Research Database (Denmark)

    Molak, Martyna; Lorenzen, Eline; Shapiro, Beth

    2013-01-01

    analyses of ancient DNA. We also investigated the sample size and temporal span of the ancient DNA sequences needed to estimate phylogenetic timescales reliably. Our results show that the range of sample ages plays a crucial role in determining the quality of the results but that accurate and precise......In recent years, ancient DNA has increasingly been used for estimating molecular timescales, particularly in studies of substitution rates and demographic histories. Molecular clocks can be calibrated using temporal information from ancient DNA sequences. This information comes from the ages...... of the ancient samples, which can be estimated by radiocarbon dating the source material or by dating the layers in which the material was deposited. Both methods involve sources of uncertainty. The performance of Bayesian phylogenetic inference depends on the information content of the data set, which includes...

  11. Paleo-Environmental Reconstruction Using Ancient DNA

    DEFF Research Database (Denmark)

    Pedersen, Mikkel Winther

    The aim of this thesis has been to investigate and expand the methodology and applicability for using ancient DNA deposited in lake sediments to detect and determine its genetic sources for paleo-environmental reconstruction. The aim was furthermore to put this tool into an applicable context...... research on ancient and modern environmental DNA (Paper 1), secondly by setting up a comparative study (Paper 2) to investigate how an ancient plant DNA (mini)-barcode can reflect other traditional methods (e.g. pollen and macrofossils) for reconstructing floristic history. In prolongation of the results...... obtained in paper 2 we developed a holistic metagenomic method combined with shotgun sequencing of ancient DNA in lake sediment samples to reconstruct organismal assemblages in addition to the flora e.g. micro-, meso- and megafauna, fungi and microbial communities (Paper 3). Fundamental processes were...

  12. Fossil avian eggshell preserves ancient DNA

    DEFF Research Database (Denmark)

    Oskam, Charlotte L; Haile, James Seymour; McLay, Emma

    2010-01-01

    Owing to exceptional biomolecule preservation, fossil avian eggshell has been used extensively in geochronology and palaeodietary studies. Here, we show, to our knowledge, for the first time that fossil eggshell is a previously unrecognized source of ancient DNA (aDNA). We describe the successful...

  13. Damage and repair of ancient DNA

    DEFF Research Database (Denmark)

    Mitchell, David; Willerslev, Eske; Hansen, Anders

    2005-01-01

    Under certain conditions small amounts of DNA can survive for long periods of time and can be used as polymerase chain reaction (PCR) substrates for the study of phylogenetic relationships and population genetics of extinct plants and animals, including hominids. Because of extensive DNA...... such as extinct horses, cave bears, the marsupial wolf, the moa, and Neanderthal. In the past few years, this technology has been extended to the study of infectious disease in ancient Egyptian and South American mummies, the dietary habits of ancient animals, and agricultural practices and population dynamics...

  14. Ancient DNA analysis of dental calculus.

    Science.gov (United States)

    Weyrich, Laura S; Dobney, Keith; Cooper, Alan

    2015-02-01

    Dental calculus (calcified tartar or plaque) is today widespread on modern human teeth around the world. A combination of soft starchy foods, changing acidity of the oral environment, genetic pre-disposition, and the absence of dental hygiene all lead to the build-up of microorganisms and food debris on the tooth crown, which eventually calcifies through a complex process of mineralisation. Millions of oral microbes are trapped and preserved within this mineralised matrix, including pathogens associated with the oral cavity and airways, masticated food debris, and other types of extraneous particles that enter the mouth. As a result, archaeologists and anthropologists are increasingly using ancient human dental calculus to explore broad aspects of past human diet and health. Most recently, high-throughput DNA sequencing of ancient dental calculus has provided valuable insights into the evolution of the oral microbiome and shed new light on the impacts of some of the major biocultural transitions on human health throughout history and prehistory. Here, we provide a brief historical overview of archaeological dental calculus research, and discuss the current approaches to ancient DNA sampling and sequencing. Novel applications of ancient DNA from dental calculus are discussed, highlighting the considerable scope of this new research field for evolutionary biology and modern medicine. Copyright © 2014 Elsevier Ltd. All rights reserved.

  15. Ancient and modern environmental DNA

    DEFF Research Database (Denmark)

    Pedersen, Mikkel Winther; Overballe-Petersen, Søren; Ermini, Luca

    2015-01-01

    woolly mammoth in Alaska, and pushed back the dates for spruce survival in Scandinavian ice-free refugia during the last glaciation. More recently, eDNA was used to uncover the past 50 000 years of vegetation history in the Arctic, revealing massive vegetation turnover at the Pleistocene...

  16. Mitochondrial DNA analysis of ancient Peruvian highlanders.

    Science.gov (United States)

    Shinoda, Ken-ichi; Adachi, Noboru; Guillen, Sonia; Shimada, Izumi

    2006-09-01

    Ancient DNA recovered from 57 individuals excavated by Hiram Bingham at the rural communities of Paucarcancha, Patallacta, and Huata near the famed Inca royal estate and ritual site of Machu Picchu was analyzed by polymerase chain reaction, and the results were compared with ancient and modern DNA from various Central Andean areas to test their hypothesized indigenous highland origins. The control and coding regions of the mitochondrial DNA (mtDNA) of 35 individuals in this group were sequenced, and the haplogroups of each individual were determined. The frequency data for the haplogroups of these samples show clear proximity to those of modern Quechua and Aymara populations in the Peruvian and Bolivian highlands, and contrast with those of pre-Hispanic individuals of the north coast of Peru that we defined previously. Our study suggests a strong genetic affinity between sampled late pre-Hispanic individuals and modern Andean highlanders. A previous analysis of the Machu Picchu osteological collection suggests that the residents there were a mixed group of natives from various coastal and highland regions relocated by the Inca state for varied purposes. Overall, our study indicates that the sampled individuals from Paucarcancha and Patallacta were indigenous highlanders who provided supportive roles for nearby Machu Picchu. 2006 Wiley-Liss, Inc.

  17. ANALYSIS OF ANCIENT DNA FROM FOSSIL CORALLINES (CORALLINALES, RHODOPHYTA)(1).

    Science.gov (United States)

    Hughey, Jeffery R; Braga, Juan C; Aguirre, Julio; Woelkerling, William J; Webster, Jody M

    2008-04-01

    The field of molecular paleontology has recently made significant contributions to anthropology and biology. Hundreds of ancient DNA studies have been published, but none has targeted fossil coralline algae. Using regions of the SSU gene, we analyzed rDNA from fossil coralline algae of varying ages and states of preservation from Spain, Papua New Guinea (PNG), and the Great Barrier Reef (GBR). Specimens from PNG, GBR, and some localities from Spain did not contain endogenous ancient DNA. Reproducible sequence data were obtained from specimens ∼550 years old from near Cadiz, Spain, and from rocky-shore deposits in Carboneras, Almeria Province of Spain (∼78,000 years before present [YBP]). Based on BLAST searches and a phylogenetic analysis of sequences, an undescribed coralline alga belonging to the Melobesioideae was discovered in the Carboneras material as well as the following coralline genera: Jania, Lithophyllum, Lithothamnion, Mesophyllum, and Phymatolithon. DNA from fleshy brown and red macroalgae was also discovered in the specimens from Carboneras. The coralline algae identified using molecular techniques were in agreement with those based on morphological methods. The identified taxa are common in the present-day southeastern Spain littoral zone. Amino acid racemization, concentration ratios, and specific concentrations failed to show a correlation between biomolecular preservation and PCR amplification success. Results suggest that molecular investigations on fossil algae, although limited by technical difficulties, are feasible. Validity of our results was established using authentication criteria and a self-critical approach to compliance. © 2008 Phycological Society of America.

  18. Ancient DNA and the tropics: a rodent's tale

    OpenAIRE

    Gutiérrez-García, Tania A.; Vázquez-Domínguez, Ella; Arroyo-Cabrales, Joaquín; Kuch, Melanie; Enk, Jacob; King, Christine; Poinar, Hendrik N.

    2014-01-01

    Most genetic studies of Holocene fauna have been performed with ancient samples from dry and cold regions, in which preservation of fossils is facilitated and molecular damage is reduced. Ancient DNA work from tropical regions has been precluded owing to factors that limit DNA preservation (e.g. temperature, hydrolytic damage). We analysed ancient DNA from rodent jawbones identified as Ototylomys phyllotis, found in Holocene and Late Pleistocene stratigraphic layers from Loltún, a humid tropi...

  19. Sex identification of ancient DNA samples using a microfluidic device.

    Science.gov (United States)

    Shaw, Kirsty J; Brown, Keri A; Brown, Terence A; Haswell, Stephen J

    2015-01-01

    Ancient DNA is the name given to the degraded, fragmented, and chemically damaged biomolecules that can be recovered from archaeological remains of plants, animals, and humans. Where ancient human DNA has survived at archaeological sites, it can give valuable information and is especially useful for its potential to identify kinship, population affinities, pathogens, and biological sex. Here, we describe the operation of a microfluidic device for the sex identification of ancient DNA samples using an efficient sample handling process. DNA is extracted from powdered bone samples and abasic sites labeled with biotin. Streptavidin-coated superparamagnetic particles are used to isolate the labeled DNA prior to amplification of the Amelogenin sex marker.

  20. Ancient DNA investigations: A review on their significance in ...

    African Journals Online (AJOL)

    throughput DNA sequencing allow DNA fragments of short lengths to be completely sequenced (Krause et al 2010, Briggs et al 2010). aDNA authentication : Genetic analysis of archeological remains is very challenging because of the contamination by current DNA. Several studies have focused on the identification of the.

  1. Ancient bacteria in permafrost soils fact or artefact? Considerations in recovering microbial DNA from geological ancient settings

    Science.gov (United States)

    Willerslev, E.

    2003-04-01

    Several recent reports claim that prokaryotic genetic sequences or viable cultures can survive for millions of years in geological settings. If substantiated, these findings could fundamentally alter views about bacterial physiology, ecology and evolution. However, both the culturing of microbes and the amplification of ancient DNA molecules from fossil remains are beset with difficulties. First, theoretical and empirical studies have shown that small DNA fragments (100 200 bp) do not survive in the geosphere for more than 104 years in temperate environments and 105 years in colder ones due to hydrolytic and oxidative damage. Therefore, the revivals of dormant bacteria with no active DNA repair from remains hundreds of thousands to millions of years old is, from a theoretical point, expected to be difficult, if not impossible. Second, the no specificity of the media used to culture micro organisms, as well as the great sensitivity of PCR, makes the risk of contamination with contemporary ubiquitous microbial cells and exogenous DNA molecules extremely high. Contamination poses risks at all stages of sample processing (e.g.) within the samples themselves, in the chemical reagents, on laboratory disposables or through the air. The high risk of contamination strongly suggests the need for standardized procedures within the field such as independent replication of results. This criterion of authenticity has not yet been full field in any of the studies claiming million year old microbial cultures or DNA. In order to tests the long-term survival of ancient bacteria DNA a study on permafrost was conducted using ancient DNA precautions, controls and criteria. Permafrost must be considered among the most promising environments for long term DNA survival due to its constant low temperatures (-10C to 12C Siberian or 20C Antarctica) and high cell numbers (107). We found that bacteria DNA could reproducibly be obtained from samples dated up to 300-400,000 years B.P. but not

  2. Ancient DNA and Forensics Mutual Benefits a Practical Sampling and Laboratory Guide Through a Virtual Ancient DNA Study

    Directory of Open Access Journals (Sweden)

    Jan Cemper-Kiesslich

    2014-09-01

    In this review the authors give a general overview on the field of ancient DNA analysis focussing of the potentials and limits, fields of application, requirements for samples, laboratory setup, reaction design and equipment as well as a brief outlook on current developments, future perspectives and potential cross links with associated scientific disciplines. Key words: Human DNA, Ancient DNA, Forensic DNA typing, Molecular archaeology, Application.

  3. Quantification and presence of human ancient DNA in burial place ...

    African Journals Online (AJOL)

    For reliable and sensitive DNA quantitation, the application of real time PCR is described. A published real-time PCR assay, which allows for the combined analysis of nuclear or ancient DNA and mitochondrial DNA, was modified. This approach can be used for recovering DNA from the surface of fossil bone remains in ...

  4. Non-destructive sampling of ancient insect DNA

    OpenAIRE

    Thomsen, Philip Francis; Elias, Scott; Gilbert, Tom; Haile, James; Munch, Kasper; Kuzmina, Svetlana; Froese, Duane G; Sher, Andrei; Holdaway, Richard N; Willerslev, Eske

    2009-01-01

    Udgivelsesdato: 2009-null BACKGROUND: A major challenge for ancient DNA (aDNA) studies on insect remains is that sampling procedures involve at least partial destruction of the specimens. A recent extraction protocol reveals the possibility of obtaining DNA from past insect remains without causing visual morphological damage. We test the applicability of this protocol on historic museum beetle specimens dating back to AD 1820 and on ancient beetle chitin remains from permafrost (permanentl...

  5. Non-destructive sampling of ancient insect DNA

    DEFF Research Database (Denmark)

    Thomsen, Philip Francis; Elias, Scott; Gilbert, Tom

    2009-01-01

    BACKGROUND: A major challenge for ancient DNA (aDNA) studies on insect remains is that sampling procedures involve at least partial destruction of the specimens. A recent extraction protocol reveals the possibility of obtaining DNA from past insect remains without causing visual morphological......-preserved insect fossil remains tested, where DNA was obtained from samples up to ca. 26,000 years old. The non-frozen sediment DNA approach appears to have great potential for recording the former presence of insect taxa not normally preserved as macrofossils and opens new frontiers in research on ancient...

  6. Non-destructive sampling of ancient insect DNA.

    Directory of Open Access Journals (Sweden)

    Philip Francis Thomsen

    Full Text Available BACKGROUND: A major challenge for ancient DNA (aDNA studies on insect remains is that sampling procedures involve at least partial destruction of the specimens. A recent extraction protocol reveals the possibility of obtaining DNA from past insect remains without causing visual morphological damage. We test the applicability of this protocol on historic museum beetle specimens dating back to AD 1820 and on ancient beetle chitin remains from permafrost (permanently frozen soil dating back more than 47,000 years. Finally, we test the possibility of obtaining ancient insect DNA directly from non-frozen sediments deposited 3280-1800 years ago -- an alternative approach that also does not involve destruction of valuable material. METHODOLOGY/PRINCIPAL FINDINGS: The success of the methodological approaches are tested by PCR and sequencing of COI and 16S mitochondrial DNA (mtDNA fragments of 77-204 base pairs (-bp in size using species-specific and general insect primers. CONCLUSION/SIGNIFICANCE: The applied non-destructive DNA extraction method shows promising potential on insect museum specimens of historical age as far back as AD 1820, but less so on the ancient permafrost-preserved insect fossil remains tested, where DNA was obtained from samples up to ca. 26,000 years old. The non-frozen sediment DNA approach appears to have great potential for recording the former presence of insect taxa not normally preserved as macrofossils and opens new frontiers in research on ancient biodiversity.

  7. Non-destructive sampling of ancient insect DNA.

    Science.gov (United States)

    Thomsen, Philip Francis; Elias, Scott; Gilbert, M Thomas P; Haile, James; Munch, Kasper; Kuzmina, Svetlana; Froese, Duane G; Sher, Andrei; Holdaway, Richard N; Willerslev, Eske

    2009-01-01

    A major challenge for ancient DNA (aDNA) studies on insect remains is that sampling procedures involve at least partial destruction of the specimens. A recent extraction protocol reveals the possibility of obtaining DNA from past insect remains without causing visual morphological damage. We test the applicability of this protocol on historic museum beetle specimens dating back to AD 1820 and on ancient beetle chitin remains from permafrost (permanently frozen soil) dating back more than 47,000 years. Finally, we test the possibility of obtaining ancient insect DNA directly from non-frozen sediments deposited 3280-1800 years ago -- an alternative approach that also does not involve destruction of valuable material. The success of the methodological approaches are tested by PCR and sequencing of COI and 16S mitochondrial DNA (mtDNA) fragments of 77-204 base pairs (-bp) in size using species-specific and general insect primers. The applied non-destructive DNA extraction method shows promising potential on insect museum specimens of historical age as far back as AD 1820, but less so on the ancient permafrost-preserved insect fossil remains tested, where DNA was obtained from samples up to ca. 26,000 years old. The non-frozen sediment DNA approach appears to have great potential for recording the former presence of insect taxa not normally preserved as macrofossils and opens new frontiers in research on ancient biodiversity.

  8. Role of radiation physics in the study and authentication of ancient gold work

    International Nuclear Information System (INIS)

    Guerra, M.F.

    2014-01-01

    Ancient gold items are important expressions of different aspects of past civilisations. By using non-destructive techniques of analysis and exam it is possible to obtain data kept within the objects morphology and within the materials employed, providing information, among others, on the manufacturing technologies, on the functions attributed to the objects, and on the sources of raw material exploited. This paper aims to give an overview of the questions raised by cultural heritage objects made with gold, and the role of science-based techniques applied to their study and authentication. Two examples serve to illustrate this: one concerns 19th century restorations of Etruscan objects and the other the provenance of Merovingian gold. - Highlights: ► An overview of the application of radiation techniques for the analysis of ancient gold work is given. ► We focused on non-destructive SEM-EDS, IBA techniques, X-radiography, and optical microscopy. ► Exam is illustrated by the authentication of Etruscan gold jewellery kept in museum collections. ► Fingerprinting gold is illustrated by the elemental analysis of Merovingian items from tombs in Gaul

  9. New insights on single-stranded versus double-stranded DNA library preparation for ancient DNA

    DEFF Research Database (Denmark)

    Wales, Nathan; Carøe, Christian; Sandoval-Velasco, Marcela

    2015-01-01

    An innovative single-stranded DNA (ssDNA) library preparation method has sparked great interest among ancient DNA (aDNA) researchers, especially after reports of endogenous DNA content increases >20-fold in some samples. To investigate the behavior of this method, we generated ssDNA...... and conventional double-stranded DNA (dsDNA) libraries from 23 ancient and historic plant and animal specimens. We found ssDNA library preparation substantially increased endogenous content when dsDNA libraries contained...

  10. Ancient DNA and the tropics: a rodent's tale.

    Science.gov (United States)

    Gutiérrez-García, Tania A; Vázquez-Domínguez, Ella; Arroyo-Cabrales, Joaquín; Kuch, Melanie; Enk, Jacob; King, Christine; Poinar, Hendrik N

    2014-06-01

    Most genetic studies of Holocene fauna have been performed with ancient samples from dry and cold regions, in which preservation of fossils is facilitated and molecular damage is reduced. Ancient DNA work from tropical regions has been precluded owing to factors that limit DNA preservation (e.g. temperature, hydrolytic damage). We analysed ancient DNA from rodent jawbones identified as Ototylomys phyllotis, found in Holocene and Late Pleistocene stratigraphic layers from Loltún, a humid tropical cave located in the Yucatan peninsula. We extracted DNA and amplified six short overlapping fragments of the cytochrome b gene, totalling 666 bp, which represents an unprecedented success considering tropical ancient DNA samples. We performed genetic, phylogenetic and divergence time analyses, combining sequences from ancient and modern O. phyllotis, in order to assess the ancestry of the Loltún samples. Results show that all ancient samples fall into a unique clade that diverged prior to the divergence of the modern O. phyllotis, supporting it as a distinct Pleistocene form of the Ototylomys genus. Hence, this rodent's tale suggests that the sister group to modern O. phyllotis arose during the Miocene-Pliocene, diversified during the Pleistocene and went extinct in the Holocene. © 2014 The Author(s) Published by the Royal Society. All rights reserved.

  11. Metabolite Profiling and Classification of DNA-Authenticated Licorice Botanicals

    Science.gov (United States)

    Simmler, Charlotte; Anderson, Jeffrey R.; Gauthier, Laura; Lankin, David C.; McAlpine, James B.; Chen, Shao-Nong; Pauli, Guido F.

    2015-01-01

    Raw licorice roots represent heterogeneous materials obtained from mainly three Glycyrrhiza species. G. glabra, G. uralensis, and G. inflata exhibit marked metabolite differences in terms of flavanones (Fs), chalcones (Cs), and other phenolic constituents. The principal objective of this work was to develop complementary chemometric models for the metabolite profiling, classification, and quality control of authenticated licorice. A total of 51 commercial and macroscopically verified samples were DNA authenticated. Principal component analysis and canonical discriminant analysis were performed on 1H NMR spectra and area under the curve values obtained from UHPLC-UV chromatograms, respectively. The developed chemometric models enable the identification and classification of Glycyrrhiza species according to their composition in major Fs, Cs, and species specific phenolic compounds. Further key outcomes demonstrated that DNA authentication combined with chemometric analyses enabled the characterization of mixtures, hybrids, and species outliers. This study provides a new foundation for the botanical and chemical authentication, classification, and metabolomic characterization of crude licorice botanicals and derived materials. Collectively, the proposed methods offer a comprehensive approach for the quality control of licorice as one of the most widely used botanical dietary supplements. PMID:26244884

  12. Using Ancient DNA to Understand Evolutionary and Ecological Processes

    DEFF Research Database (Denmark)

    Orlando, Ludovic Antoine Alexandre; Cooper, Alan

    2014-01-01

    Ancient DNA provides a unique means to record genetic change through time and directly observe evolutionary and ecological processes. Although mostly based on mitochondrial DNA, the increasing availability of genomic sequences is leading to unprecedented levels of resolution. Temporal studies of ...

  13. Evidence of authentic DNA from Danish Viking Age skeletons untouched by humans for 1,000 years.

    Directory of Open Access Journals (Sweden)

    Linea Melchior

    Full Text Available BACKGROUND: Given the relative abundance of modern human DNA and the inherent impossibility for incontestable proof of authenticity, results obtained on ancient human DNA have often been questioned. The widely accepted rules regarding ancient DNA work mainly affect laboratory procedures, however, pre-laboratory contamination occurring during excavation and archaeological-/anthropological handling of human remains as well as rapid degradation of authentic DNA after excavation are major obstacles. METHODOLOGY/PRINCIPAL FINDINGS: We avoided some of these obstacles by analyzing DNA from ten Viking Age subjects that at the time of sampling were untouched by humans for 1,000 years. We removed teeth from the subjects prior to handling by archaeologists and anthropologists using protective equipment. An additional tooth was removed after standard archaeological and anthropological handling. All pre-PCR work was carried out in a "clean- laboratory" dedicated solely to ancient DNA work. Mitochondrial DNA was extracted and overlapping fragments spanning the HVR-1 region as well as diagnostic sites in the coding region were PCR amplified, cloned and sequenced. Consistent results were obtained with the "unhandled" teeth and there was no indication of contamination, while the latter was the case with half of the "handled" teeth. The results allowed the unequivocal assignment of a specific haplotype to each of the subjects, all haplotypes being compatible in their character states with a phylogenetic tree drawn from present day European populations. Several of the haplotypes are either infrequent or have not been observed in modern Scandinavians. The observation of haplogroup I in the present study (<2% in modern Scandinavians supports our previous findings of a pronounced frequency of this haplogroup in Viking and Iron Age Danes. CONCLUSION: The present work provides further evidence that retrieval of ancient human DNA is a possible task provided adequate

  14. Pathogenic microbial ancient DNA: a problem or an opportunity?

    DEFF Research Database (Denmark)

    Willerslev, Eske; Cooper, Alan

    2006-01-01

    -controlled and rigorous studies that address technical issues and reliability criteria. This is unfortunate, as the rapid evolutionary rate of many pathogens offers a unique means to establish the authenticity of ancient pathogen sequences-since they should clearly be ancestral to modern genetic diversity (e.g. Reid et...... cloning. Yet these studies have used mobile insertion elements (e.g. IS 6110 in tuberculosis) or conserved loci (e.g. 16S) to detect the presence of pathogens, and very similar or identical sequences have been reported from environmental bacteria (Gilbert et al. 2004). For example, Rollo & Marota (1999...

  15. High-resolution analysis of cytosine methylation in ancient DNA.

    Directory of Open Access Journals (Sweden)

    Bastien Llamas

    Full Text Available Epigenetic changes to gene expression can result in heritable phenotypic characteristics that are not encoded in the DNA itself, but rather by biochemical modifications to the DNA or associated chromatin proteins. Interposed between genes and environment, these epigenetic modifications can be influenced by environmental factors to affect phenotype for multiple generations. This raises the possibility that epigenetic states provide a substrate for natural selection, with the potential to participate in the rapid adaptation of species to changes in environment. Any direct test of this hypothesis would require the ability to measure epigenetic states over evolutionary timescales. Here we describe the first single-base resolution of cytosine methylation patterns in an ancient mammalian genome, by bisulphite allelic sequencing of loci from late Pleistocene Bison priscus remains. Retrotransposons and the differentially methylated regions of imprinted loci displayed methylation patterns identical to those derived from fresh bovine tissue, indicating that methylation patterns are preserved in the ancient DNA. Our findings establish the biochemical stability of methylated cytosines over extensive time frames, and provide the first direct evidence that cytosine methylation patterns are retained in DNA from ancient specimens. The ability to resolve cytosine methylation in ancient DNA provides a powerful means to study the role of epigenetics in evolution.

  16. Preservation of ancient DNA in thermally damaged archaeological bone

    Science.gov (United States)

    Ottoni, Claudio; Koon, Hannah E. C.; Collins, Matthew J.; Penkman, Kirsty E. H.; Rickards, Olga; Craig, Oliver E.

    2009-02-01

    Evolutionary biologists are increasingly relying on ancient DNA from archaeological animal bones to study processes such as domestication and population dispersals. As many animal bones found on archaeological sites are likely to have been cooked, the potential for DNA preservation must be carefully considered to maximise the chance of amplification success. Here, we assess the preservation of mitochondrial DNA in a medieval cattle bone assemblage from Coppergate, York, UK. These bones have variable degrees of thermal alterations to bone collagen fibrils, indicative of cooking. Our results show that DNA preservation is not reliant on the presence of intact collagen fibrils. In fact, a greater number of template molecules could be extracted from bones with damaged collagen. We conclude that moderate heating of bone may enhance the retention of DNA fragments. Our results also indicate that ancient DNA preservation is highly variable, even within a relatively recent assemblage from contexts conducive to organic preservation, and that diagenetic parameters based on protein diagenesis are not always useful for predicting ancient DNA survival.

  17. Preservation of ancient DNA in thermally damaged archaeological bone.

    Science.gov (United States)

    Ottoni, Claudio; Koon, Hannah E C; Collins, Matthew J; Penkman, Kirsty E H; Rickards, Olga; Craig, Oliver E

    2009-02-01

    Evolutionary biologists are increasingly relying on ancient DNA from archaeological animal bones to study processes such as domestication and population dispersals. As many animal bones found on archaeological sites are likely to have been cooked, the potential for DNA preservation must be carefully considered to maximise the chance of amplification success. Here, we assess the preservation of mitochondrial DNA in a medieval cattle bone assemblage from Coppergate, York, UK. These bones have variable degrees of thermal alterations to bone collagen fibrils, indicative of cooking. Our results show that DNA preservation is not reliant on the presence of intact collagen fibrils. In fact, a greater number of template molecules could be extracted from bones with damaged collagen. We conclude that moderate heating of bone may enhance the retention of DNA fragments. Our results also indicate that ancient DNA preservation is highly variable, even within a relatively recent assemblage from contexts conducive to organic preservation, and that diagenetic parameters based on protein diagenesis are not always useful for predicting ancient DNA survival.

  18. Ancient DNA in historical parchments - identifying a procedure for extraction and amplification of genetic material.

    Science.gov (United States)

    Lech, T

    2016-05-06

    Historical parchments in the form of documents, manuscripts, books, or letters, make up a large portion of cultural heritage collections. Their priceless historical value is associated with not only their content, but also the information hidden in the DNA deposited on them. Analyses of ancient DNA (aDNA) retrieved from parchments can be used in various investigations, including, but not limited to, studying their authentication, tracing the development of the culture, diplomacy, and technology, as well as obtaining information on the usage and domestication of animals. This article proposes and verifies a procedure for aDNA recovery from historical parchments and its appropriate preparation for further analyses. This study involved experimental selection of an aDNA extraction method with the highest efficiency and quality of extracted genetic material, from among the multi-stage phenol-chloroform extraction methods, and the modern, column-based techniques that use selective DNA-binding membranes. Moreover, current techniques to amplify entire genetic material were questioned, and the possibility of using mitochondrial DNA for species identification was analyzed. The usefulness of the proposed procedure was successfully confirmed in identification tests of historical parchments dating back to the 13-16th century AD.

  19. Statistical guidelines for detecting past population shifts using ancient DNA

    DEFF Research Database (Denmark)

    Mourier, Tobias; Ho, Simon Y. W.; Gilbert, Tom

    2012-01-01

    post-bottleneck recoveries. In contrast, nuclear SNPs can detect bottlenecks followed by rapid recovery, although bottlenecks involving reduction of less than half the population are generally detected with low power unless extensive genetic information from ancient individuals is available. Our...... results provide useful guidelines for scaling sampling schemes and for optimizing our ability to infer past population dynamics. In addition, our results suggest that many ancient DNA studies may face power issues in detecting moderate demographic collapses and/or highly dynamic demographic shifts when...

  20. Correction to 'Ancient DNA and the tropics: a rodent's tale'.

    Science.gov (United States)

    Gutiérrez-García, Tania A; Vázquez-Domínguez, Ella; Arroyo-Cabrales, Joaquín; Kuch, Melanie; Enk, Jacob; King, Christine; Poinar, Hendrik N

    2015-03-01

    The present erratum is in regards to our article entitled ‘Ancient DNA and the tropics: a rodent's tale’. We were made aware of problems with some of the ancient sequences submitted to GenBank and conducted a systematic review of all the files used in our study. We discovered that, unfortunately, an incorrect file was sent to GenBank and was also used in some of our downstream analyses. We immediately contacted GenBank, explained the situation and corrected the file. We have redone some analyses with the correct file and describe these changes below.

  1. The preliminary application of OSL in comparison with TL for authentication of ancient Chinese bricks

    International Nuclear Information System (INIS)

    Leung, P.L.; Tang Qiang; Li, Mike; Zhang Chunxiang

    2005-01-01

    The single-aliquot regenerative-dose (SAR) protocol with optically stimulated luminenscence (OSL) was applied to measure the equivalent dose (ED) of ancient Chinese bricks ranging in age from 180 to 1600 years. In the protocol, sensitivity changes can be corrected by using OSL response to a fixed test dose during measurement. For comparative study between OSL and TL, thermoluminescence (TL) measurement procedures were also applied to determine the paleodose of the bricks. Both results of OSL and TL are in agreement with the known ages of the bricks, and the paleodose ratios(ED OSL / ED TL ) are between 0.96 and 1.21, mean value 1.08+/-0.02. The annual doses of the bricks, estimated by the paleodoses and the known ages, range from 5.07 to 6.79mGy/a, comparable with the measured annual dose values of the bricks. Therefore, it is concluded that the SAR protocol is a rapid and effective OSL technique to authenticate Chinese bricks

  2. Reconstructing Tradition: Heritage Authentication and Tourism-Related Commodification of the Ancient City of Pingyao

    Directory of Open Access Journals (Sweden)

    Xiaoyan Su

    2018-03-01

    Full Text Available This paper examines how the United Nations Educational, Scientific and Cultural Organization (UNESCO Convention Concerning the Protection of World Cultural and Natural Heritage (CCPWCNH is implemented in China, with specific reference to tourism development at the local level in the Ancient City of Pingyao (ACP. Based on a qualitative methodology and constructivist paradigm, the research employs observation and semi-structured interviews to explore how the interaction between heritage authorization and tourism-related commodification shapes the transformation of the local community. Giddens’ theories, amongst others, on modernity, time–space distanciation, disembedding, and reflexivity, are employed to analyze this case study. The paper argues that the reconstruction of “traditional-style culture” has contributed to the transformative processes in the ACP. Traditional-style culture differs from “traditional culture” in that the former refers to cultural forms that are purposely (reconstructed to serve contemporary political or economic needs, while the latter refers to cultural forms that are rooted in the local contexts of premodern societies. One of the impacts of traditional-style culture, which is the product of the interaction between heritage authorization and tourism development, is the emergence of a commercialized environment. This environment confounds the notion of authenticity that is claimed in authorized concepts of heritage. There, construction of traditional-style culture demonstrates the relationship of powerful actors with hierarchical power, leading to an unequal positioning of external agents (such as heritage experts and local residents.

  3. Ancient DNA perspectives on American colonization and population history.

    Science.gov (United States)

    Raff, Jennifer A; Bolnick, Deborah A; Tackney, Justin; O'Rourke, Dennis H

    2011-12-01

    Ancient DNA (aDNA) analyses have proven to be important tools in understanding human population dispersals, settlement patterns, interactions between prehistoric populations, and the development of regional population histories. Here, we review the published results of sixty-three human populations from throughout the Americas and compare the levels of diversity and geographic patterns of variation in the ancient samples with contemporary genetic variation in the Americas in order to investigate the evolution of the Native American gene pool over time. Our analysis of mitochondrial haplogroup frequencies and prehistoric population genetic diversity presents a complex evolutionary picture. Although the broad genetic structure of American prehistoric populations appears to have been established relatively early, we nevertheless identify examples of genetic discontinuity over time in select regions. We discuss the implications this finding may have for our interpretation of the genetic evidence for the initial colonization of the Americas and its subsequent population history. 2011 Wiley Periodicals, Inc.

  4. Ancient DNA analysis of northeast Pacific humpback whale (Megaptera novaeangliae)

    OpenAIRE

    Arndt, Ursula Maria

    2011-01-01

    The main goal of this ancient DNA-based study was to analyze archaeological whale skeletal remains from the west coast of Vancouver Island, British Columbia to investigate population genetic diversities of humpback whales pre-dating industrial whaling. This study also examined whale hunting practices of early indigenous people by revealing potential species selections. Nuu-chah-nulth people are believed to have hunted whales for millennia and numerous whale bones have been recovered from arch...

  5. Authentication of Ginkgo biloba herbal dietary supplements using DNA barcoding.

    Science.gov (United States)

    Little, Damon P

    2014-09-01

    Ginkgo biloba L. (known as ginkgo or maidenhair tree) is a phylogenetically isolated, charismatic, gymnosperm tree. Herbal dietary supplements, prepared from G. biloba leaves, are consumed to boost cognitive capacity via improved blood perfusion and mitochondrial function. A novel DNA mini-barcode assay was designed and validated for the authentication of G. biloba in herbal dietary supplements (n = 22; sensitivity = 1.00, 95% CI = 0.59-1.00; specificity = 1.00, 95% CI = 0.64-1.00). This assay was further used to estimate the frequency of mislabeled ginkgo herbal dietary supplements on the market in the United States of America: DNA amenable to PCR could not be extracted from three (7.5%) of the 40 supplements sampled, 31 of 37 (83.8%) assayable supplements contained identifiable G. biloba DNA, and six supplements (16.2%) contained fillers without any detectable G. biloba DNA. It is hoped that this assay will be used by supplement manufacturers to ensure that their supplements contain G. biloba.

  6. Highly informative ancient DNA 'snippets' for New Zealand moa.

    Directory of Open Access Journals (Sweden)

    Jonathan McCallum

    Full Text Available BACKGROUND: Analysis of ancient DNA has provided invaluable information on past ecologies, ancient populations, and extinct species. We used a short snippet of highly variable mitochondrial control region sequence from New Zealand's moa to characterise a large number of bones previously intractable to DNA analysis as well as bone fragments from swamps to gain information about the haplotype diversity and phylogeography that existed in five moa species. METHODOLOGY/PRINCIPAL FINDINGS: By targeting such 'snippets', we show that moa populations differed substantially in geographic structure that is likely to be related to population mobility and history. We show that populations of Pachyornis geranoides, Dinornis novaezealandiae, and Dinornis robustus were highly structured and some appear to have occupied the same geographic location for hundreds of thousands of years. In contrast, populations of the moa Anomalopteryx didiformis and Euryapteryx curtus were widespread, with specific populations of the latter occupying both the North and South Islands of New Zealand. We further show that for a specific area, in this case a North Island swamp, complete haplotype diversity and even sex can be recovered from collections of small, often discarded, bone fragments. CONCLUSIONS/SIGNIFICANCE: Short highly variable mitochondrial 'snippets' allow successful typing of environmentally damaged and fragmented skeletal material, and can provide useful information about ancient population diversity and structure without the need to sample valuable, whole bones often held by museums.

  7. Retroviral DNA Sequences as a Means for Determining Ancient Diets.

    Directory of Open Access Journals (Sweden)

    Jessica I Rivera-Perez

    Full Text Available For ages, specialists from varying fields have studied the diets of the primeval inhabitants of our planet, detecting diet remains in archaeological specimens using a range of morphological and biochemical methods. As of recent, metagenomic ancient DNA studies have allowed for the comparison of the fecal and gut microbiomes associated to archaeological specimens from various regions of the world; however the complex dynamics represented in those microbial communities still remain unclear. Theoretically, similar to eukaryote DNA the presence of genes from key microbes or enzymes, as well as the presence of DNA from viruses specific to key organisms, may suggest the ingestion of specific diet components. In this study we demonstrate that ancient virus DNA obtained from coprolites also provides information reconstructing the host's diet, as inferred from sequences obtained from pre-Columbian coprolites. This depicts a novel and reliable approach to determine new components as well as validate the previously suggested diets of extinct cultures and animals. Furthermore, to our knowledge this represents the first description of the eukaryotic viral diversity found in paleofaeces belonging to pre-Columbian cultures.

  8. High-Throughput DNA sequencing of ancient wood.

    Science.gov (United States)

    Wagner, Stefanie; Lagane, Frédéric; Seguin-Orlando, Andaine; Schubert, Mikkel; Leroy, Thibault; Guichoux, Erwan; Chancerel, Emilie; Bech-Hebelstrup, Inger; Bernard, Vincent; Billard, Cyrille; Billaud, Yves; Bolliger, Matthias; Croutsch, Christophe; Čufar, Katarina; Eynaud, Frédérique; Heussner, Karl Uwe; Köninger, Joachim; Langenegger, Fabien; Leroy, Frédéric; Lima, Christine; Martinelli, Nicoletta; Momber, Garry; Billamboz, André; Nelle, Oliver; Palomo, Antoni; Piqué, Raquel; Ramstein, Marianne; Schweichel, Roswitha; Stäuble, Harald; Tegel, Willy; Terradas, Xavier; Verdin, Florence; Plomion, Christophe; Kremer, Antoine; Orlando, Ludovic

    2018-03-01

    Reconstructing the colonization and demographic dynamics that gave rise to extant forests is essential to forecasts of forest responses to environmental changes. Classical approaches to map how population of trees changed through space and time largely rely on pollen distribution patterns, with only a limited number of studies exploiting DNA molecules preserved in wooden tree archaeological and subfossil remains. Here, we advance such analyses by applying high-throughput (HTS) DNA sequencing to wood archaeological and subfossil material for the first time, using a comprehensive sample of 167 European white oak waterlogged remains spanning a large temporal (from 550 to 9,800 years) and geographical range across Europe. The successful characterization of the endogenous DNA and exogenous microbial DNA of 140 (~83%) samples helped the identification of environmental conditions favouring long-term DNA preservation in wood remains, and started to unveil the first trends in the DNA decay process in wood material. Additionally, the maternally inherited chloroplast haplotypes of 21 samples from three periods of forest human-induced use (Neolithic, Bronze Age and Middle Ages) were found to be consistent with those of modern populations growing in the same geographic areas. Our work paves the way for further studies aiming at using ancient DNA preserved in wood to reconstruct the micro-evolutionary response of trees to climate change and human forest management. © 2018 John Wiley & Sons Ltd.

  9. Application and comparison of large-scale solution-based DNA capture-enrichment methods on ancient DNA

    DEFF Research Database (Denmark)

    Avila Arcos, Maria del Carmen; Cappellini, Enrico; Romero-Navarro, J. Alberto

    2011-01-01

    The development of second-generation sequencing technologies has greatly benefitted the field of ancient DNA (aDNA). Its application can be further exploited by the use of targeted capture-enrichment methods to overcome restrictions posed by low endogenous and contaminating DNA in ancient samples...

  10. Blocking human contaminant DNA during PCR allows amplification of rare mammal species from sedimentary ancient DNA

    DEFF Research Database (Denmark)

    Boessenkool, Sanne; Epp, Laura S.; Haile, James Seymour

    2012-01-01

    , or bias, during the PCR. In this study, we test the utility of human-specific blocking primers in mammal diversity analyses of ancient permafrost samples from Siberia. Using quantitative PCR (qPCR) on human and mammoth DNA, we first optimized the design and concentration of blocking primer in the PCR......Analyses of degraded DNA are typically hampered by contamination, especially when employing universal primers such as commonly used in environmental DNA studies. In addition to false-positive results, the amplification of contaminant DNA may cause false-negative results because of competition....... Subsequently, 454 pyrosequencing of ancient permafrost samples amplified with and without the addition of blocking primer revealed that DNA sequences from a diversity of mammalian representatives of the Beringian megafauna were retrieved only when the blocking primer was added to the PCR. Notably, we observe...

  11. Conservation archaeogenomics: ancient DNA and biodiversity in the Anthropocene.

    Science.gov (United States)

    Hofman, Courtney A; Rick, Torben C; Fleischer, Robert C; Maldonado, Jesús E

    2015-09-01

    There is growing consensus that we have entered the Anthropocene, a geologic epoch characterized by human domination of the ecosystems of the Earth. With the future uncertain, we are faced with understanding how global biodiversity will respond to anthropogenic perturbations. The archaeological record provides perspective on human-environment relations through time and across space. Ancient DNA (aDNA) analyses of plant and animal remains from archaeological sites are particularly useful for understanding past human-environment interactions, which can help guide conservation decisions during the environmental changes of the Anthropocene. Here, we define the emerging field of conservation archaeogenomics, which integrates archaeological and genomic data to generate baselines or benchmarks for scientists, managers, and policy-makers by evaluating climatic and human impacts on past, present, and future biodiversity. Copyright © 2015 Elsevier Ltd. All rights reserved.

  12. 'Progress' renders detrimental an ancient mitochondrial DNA genetic variant.

    Science.gov (United States)

    Pacheu-Grau, David; Gómez-Durán, Aurora; López-Gallardo, Ester; Pinós, Tomàs; Andreu, Antoni L; López-Pérez, Manuel J; Montoya, Julio; Ruiz-Pesini, Eduardo

    2011-11-01

    A human mitochondrial DNA (mtDNA) transition, m.1555A>G, in the 12S rRNA gene causes non-syndromic hearing loss. However, this pathological mutation is the wild-type allele in orangutan mtDNA. Here we rule out different genetic factors as the reason for its fixation in orangutans and show that aminoglycosides negatively affect the oxidative phosphorylation function by decreasing the synthesis of mtDNA-encoded proteins and the amount and activity of respiratory complex IV. These drugs also diminish the growth rate of orangutan cells. The m.1555G nucleotide is also the wild-type allele in other mammal species and they might be at risk of suffering a mitochondrial disorder if treated with aminoglycosides. Therefore, pharmacogenomic approaches should be used to confirm this possibility. These observations are important for human health. Due to the fact that old age and high frequency are criteria widely used in mitochondrial medicine to rule out a genetic change as being a pathological mutation, our results prevent against simplistic genetic approaches that do not consider the potential effect of environmental conditions. Hence, these results suggest that some ancient and highly frequent human population polymorphisms, such as those defining mtDNA haplogroups, in mitochondrial rRNA genes can be deleterious in association with new environmental conditions. Therefore, as the discovery of ribosomal antibiotics has allowed to fight infectious diseases and this breakthrough can be considered an important scientific advance or 'progress', our results suggest that 'progress' can also have a negative counterpart and render detrimental many of these mtDNA genotypes.

  13. Assessing the fidelity of ancient DNA sequences amplified from nuclear genes

    DEFF Research Database (Denmark)

    Binladen, Jonas; Wiuf, Carsten Henrik; Gilbert, M. Thomas P.

    2006-01-01

    in phenotypic traits of extinct taxa. It is well documented that postmortem damage in ancient mtDNA can lead to the generation of artifactual sequences. However, as yet no one has thoroughly investigated the damage spectrum in ancient nuDNA. By comparing clone sequences from 23 fossil specimens, recovered from...

  14. DNA-based techniques for authentication of processed food and food supplements.

    Science.gov (United States)

    Lo, Yat-Tung; Shaw, Pang-Chui

    2018-02-01

    Authentication of food or food supplements with medicinal values is important to avoid adverse toxic effects, provide consumer rights, as well as for certification purpose. Compared to morphological and spectrometric techniques, molecular authentication is found to be accurate, sensitive and reliable. However, DNA degradation and inclusion of inhibitors may lead to failure in PCR amplification. This paper reviews on the existing DNA extraction and PCR protocols, and the use of small size DNA markers with sufficient discriminative power for molecular authentication. Various emerging new molecular techniques such as isothermal amplification for on-site diagnosis, next-generation sequencing for high-throughput species identification, high resolution melting analysis for quick species differentiation, DNA array techniques for rapid detection and quantitative determination in food products are also discussed. Copyright © 2017 Elsevier Ltd. All rights reserved.

  15. Benefits and Limitations of DNA Barcoding and Metabarcoding in Herbal Product Authentication

    Science.gov (United States)

    Raclariu, Ancuta Cristina; Heinrich, Michael; Ichim, Mihael Cristin

    2017-01-01

    Abstract Introduction Herbal medicines play an important role globally in the health care sector and in industrialised countries they are often considered as an alternative to mono‐substance medicines. Current quality and authentication assessment methods rely mainly on morphology and analytical phytochemistry‐based methods detailed in pharmacopoeias. Herbal products however are often highly processed with numerous ingredients, and even if these analytical methods are accurate for quality control of specific lead or marker compounds, they are of limited suitability for the authentication of biological ingredients. Objective To review the benefits and limitations of DNA barcoding and metabarcoding in complementing current herbal product authentication. Method Recent literature relating to DNA based authentication of medicinal plants, herbal medicines and products are summarised to provide a basic understanding of how DNA barcoding and metabarcoding can be applied to this field. Results Different methods of quality control and authentication have varying resolution and usefulness along the value chain of these products. DNA barcoding can be used for authenticating products based on single herbal ingredients and DNA metabarcoding for assessment of species diversity in processed products, and both methods should be used in combination with appropriate hyphenated chemical methods for quality control. Conclusions DNA barcoding and metabarcoding have potential in the context of quality control of both well and poorly regulated supply systems. Standardisation of protocols for DNA barcoding and DNA sequence‐based identification are necessary before DNA‐based biological methods can be implemented as routine analytical approaches and approved by the competent authorities for use in regulated procedures. © 2017 The Authors. Phytochemical Analysis Published by John Wiley & Sons Ltd. PMID:28906059

  16. Revising the recent evolutionary history of equids using ancient DNA.

    Science.gov (United States)

    Orlando, Ludovic; Metcalf, Jessica L; Alberdi, Maria T; Telles-Antunes, Miguel; Bonjean, Dominique; Otte, Marcel; Martin, Fabiana; Eisenmann, Véra; Mashkour, Marjan; Morello, Flavia; Prado, Jose L; Salas-Gismondi, Rodolfo; Shockey, Bruce J; Wrinn, Patrick J; Vasil'ev, Sergei K; Ovodov, Nikolai D; Cherry, Michael I; Hopwood, Blair; Male, Dean; Austin, Jeremy J; Hänni, Catherine; Cooper, Alan

    2009-12-22

    The rich fossil record of the family Equidae (Mammalia: Perissodactyla) over the past 55 MY has made it an icon for the patterns and processes of macroevolution. Despite this, many aspects of equid phylogenetic relationships and taxonomy remain unresolved. Recent genetic analyses of extinct equids have revealed unexpected evolutionary patterns and a need for major revisions at the generic, subgeneric, and species levels. To investigate this issue we examine 35 ancient equid specimens from four geographic regions (South America, Europe, Southwest Asia, and South Africa), of which 22 delivered 87-688 bp of reproducible aDNA mitochondrial sequence. Phylogenetic analyses support a major revision of the recent evolutionary history of equids and reveal two new species, a South American hippidion and a descendant of a basal lineage potentially related to Middle Pleistocene equids. Sequences from specimens assigned to the giant extinct Cape zebra, Equus capensis, formed a separate clade within the modern plain zebra species, a phenotypicically plastic group that also included the extinct quagga. In addition, we revise the currently recognized extinction times for two hemione-related equid groups. However, it is apparent that the current dataset cannot solve all of the taxonomic and phylogenetic questions relevant to the evolution of Equus. In light of these findings, we propose a rapid DNA barcoding approach to evaluate the taxonomic status of the many Late Pleistocene fossil Equidae species that have been described from purely morphological analyses.

  17. Human evolution in Siberia: from frozen bodies to ancient DNA

    Directory of Open Access Journals (Sweden)

    Bouakaze Caroline

    2010-01-01

    Full Text Available Abstract Background The Yakuts contrast strikingly with other populations from Siberia due to their cattle- and horse-breeding economy as well as their Turkic language. On the basis of ethnological and linguistic criteria as well as population genetic studies, it has been assumed that they originated from South Siberian populations. However, many questions regarding the origins of this intriguing population still need to be clarified (e.g. the precise origin of paternal lineages and the admixture rate with indigenous populations. This study attempts to better understand the origins of the Yakuts by performing genetic analyses on 58 mummified frozen bodies dated from the 15th to the 19th century, excavated from Yakutia (Eastern Siberia. Results High quality data were obtained for the autosomal STRs, Y-chromosomal STRs and SNPs and mtDNA due to exceptional sample preservation. A comparison with the same markers on seven museum specimens excavated 3 to 15 years ago showed significant differences in DNA quantity and quality. Direct access to ancient genetic data from these molecular markers combined with the archaeological evidence, demographical studies and comparisons with 166 contemporary individuals from the same location as the frozen bodies helped us to clarify the microevolution of this intriguing population. Conclusion We were able to trace the origins of the male lineages to a small group of horse-riders from the Cis-Baïkal area. Furthermore, mtDNA data showed that intermarriages between the first settlers with Evenks women led to the establishment of genetic characteristics during the 15th century that are still observed today.

  18. Patent applications for using DNA technologies to authenticate medicinal herbal material

    Directory of Open Access Journals (Sweden)

    Chan Albert

    2009-11-01

    Full Text Available Abstract Herbal medicines are used in many countries for maintaining health and treating diseases. Their efficacy depends on the use of the correct materials, and life-threatening poisoning may occur if toxic adulterants or substitutes are administered instead. Identification of a medicinal material at the DNA level provides an objective and powerful tool for quality control. Extraction of high-quality DNA is the first crucial step in DNA authentication, followed by a battery of DNA techniques including whole genome fingerprinting, DNA sequencing and DNA microarray to establish the identity of the material. New or improved technologies have been developed and valuable data have been collected and compiled for DNA authentication. Some of these technologies and data are patentable. This article provides an overview of some recent patents that cover the extraction of DNA from medicinal materials, the amplification of DNA using improved reaction conditions, the generation of DNA sequences and fingerprints, and the development of high-throughput authentication methods. It also briefly explains why these patents have been granted.

  19. DNA FROM ANCIENT STONE TOOLS AND BONES EXCAVATED AT BUGAS-HOLDING, WYOMING

    Science.gov (United States)

    Traces of DNA may preserve on ancient stone tools. We examined 24 chipped stone artifacts recovered from the Bugas-Holding site in northwestern Wyoming for the presence of DNA residues, and we compared DNA preservation in bones and stone tools from the same stratigraphic context...

  20. Computational analyses of ancient pathogen DNA from herbarium samples: challenges and prospects.

    Science.gov (United States)

    Yoshida, Kentaro; Sasaki, Eriko; Kamoun, Sophien

    2015-01-01

    The application of DNA sequencing technology to the study of ancient DNA has enabled the reconstruction of past epidemics from genomes of historically important plant-associated microbes. Recently, the genome sequences of the potato late blight pathogen Phytophthora infestans were analyzed from 19th century herbarium specimens. These herbarium samples originated from infected potatoes collected during and after the Irish potato famine. Herbaria have therefore great potential to help elucidate past epidemics of crops, date the emergence of pathogens, and inform about past pathogen population dynamics. DNA preservation in herbarium samples was unexpectedly good, raising the possibility of a whole new research area in plant and microbial genomics. However, the recovered DNA can be extremely fragmented resulting in specific challenges in reconstructing genome sequences. Here we review some of the challenges in computational analyses of ancient DNA from herbarium samples. We also applied the recently developed linkage method to haplotype reconstruction of diploid or polyploid genomes from fragmented ancient DNA.

  1. Development of biometric DNA ink for authentication security.

    Science.gov (United States)

    Hashiyada, Masaki

    2004-10-01

    Among the various types of biometric personal identification systems, DNA provides the most reliable personal identification. It is intrinsically digital and unchangeable while the person is alive, and even after his/her death. Increasing the number of DNA loci examined can enhance the power of discrimination. This report describes the development of DNA ink, which contains synthetic DNA mixed with printing inks. Single-stranded DNA fragments encoding a personalized set of short tandem repeats (STR) were synthesized. The sequence was defined as follows. First, a decimal DNA personal identification (DNA-ID) was established based on the number of STRs in the locus. Next, this DNA-ID was encrypted using a binary, 160-bit algorithm, using a hashing function to protect privacy. Since this function is irreversible, no one can recover the original information from the encrypted code. Finally, the bit series generated above is transformed into base sequences, and double-stranded DNA fragments are amplified by the polymerase chain reaction (PCR) to protect against physical attacks. Synthesized DNA was detected successfully after samples printed in DNA ink were subjected to several resistance tests used to assess the stability of printing inks. Endurance test results showed that this DNA ink would be suitable for practical use as a printing ink and was resistant to 40 hours of ultraviolet exposure, performance commensurate with that of photogravure ink. Copyright 2004 Tohoku University Medical Press

  2. Pros and cons of methylation-based enrichment methods for ancient DNA

    DEFF Research Database (Denmark)

    Seguin-Orlando, Andaine; Gamba, Cristina; Der Sarkissian, Clio

    2015-01-01

    enrichment, however, appears principally biased towards the recovery of CpG-rich and long DNA templates and is limited by the fast post-mortem cytosine deamination rates of methylated epialleles. This method, thus, appears only appropriate for the analysis of ancient methylomes from very well preserved......The recent discovery that DNA methylation survives in fossil material provides an opportunity for novel molecular approaches in palaeogenomics. Here, we apply to ancient DNA extracts the probe-independent Methylated Binding Domains (MBD)-based enrichment method, which targets DNA molecules...

  3. Comparing the performance of three ancient DNA extraction methods for high-throughput sequencing

    DEFF Research Database (Denmark)

    Gamba, Cristina; Hanghøj, Kristian Ebbesen; Gaunitz, Charleen

    2016-01-01

    The DNA molecules that can be extracted from archaeological and palaeontological remains are often degraded and massively contaminated with environmental microbial material. This reduces the efficacy of shotgun approaches for sequencing ancient genomes, despite the decreasing sequencing costs...... of high-throughput sequencing (HTS). Improving the recovery of endogenous molecules from the DNA extraction and purification steps could, thus, help advance the characterization of ancient genomes. Here, we apply the three most commonly used DNA extraction methods to five ancient bone samples spanning...... a ~30 thousand year temporal range and originating from a diversity of environments, from South America to Alaska. We show that methods based on the purification of DNA fragments using silica columns are more advantageous than in solution methods and increase not only the total amount of DNA molecules...

  4. Paleoparasitological report on Ascaris aDNA from an ancient East Asian sample

    Directory of Open Access Journals (Sweden)

    Chang Seok Oh

    2010-03-01

    Full Text Available In this study, Ascaris DNA was extracted and sequenced from a medieval archaeological sample in Korea. While Ascaris eggs were confirmed to be of human origin by archaeological evidence, it was not possible to pinpoint the exact species due to close genetic relationships among them. Despite this shortcoming, this is the first Ascaris ancient DNA (aDNA report from a medieval Asian country and thus will expand the scope of Ascaris aDNA research.

  5. A preliminary analysis of the DNA and diet of the extinct Beothuk: a systematic approach to ancient human DNA

    DEFF Research Database (Denmark)

    Kuch, Melanie; Gröcke, Darren R; Knyf, Martin C

    2007-01-01

    We have used a systematic protocol for extracting, quantitating, sexing and validating ancient human mitochondrial and nuclear DNA of one male and one female Beothuk, a Native American population from Newfoundland, which became extinct approximately 180 years ago. They carried mtDNA haplotypes, w...

  6. Stories in Genetic Code. The contribution of ancient DNA studies to anthropology and their ethical implications

    Directory of Open Access Journals (Sweden)

    Cristian M. Crespo

    2010-12-01

    Full Text Available For several decades, biological anthropology has employed different molecular markers in population research. Since 1990 different techniques in molecular biology have been developed allowing preserved DNA extraction and its typification in different samples from museums and archaeological sites. Ancient DNA studies related to archaeological issues are now included in the field of Archaeogenetics. In this work we present some of ancient DNA applications in archaeology. We also discuss advantages and limitations for this kind of research and its relationship with ethic and legal norms.

  7. Improving the performance of true single molecule sequencing for ancient DNA

    Science.gov (United States)

    2012-01-01

    Background Second-generation sequencing technologies have revolutionized our ability to recover genetic information from the past, allowing the characterization of the first complete genomes from past individuals and extinct species. Recently, third generation Helicos sequencing platforms, which perform true Single-Molecule DNA Sequencing (tSMS), have shown great potential for sequencing DNA molecules from Pleistocene fossils. Here, we aim at improving even further the performance of tSMS for ancient DNA by testing two novel tSMS template preparation methods for Pleistocene bone fossils, namely oligonucleotide spiking and treatment with DNA phosphatase. Results We found that a significantly larger fraction of the horse genome could be covered following oligonucleotide spiking however not reproducibly and at the cost of extra post-sequencing filtering procedures and skewed %GC content. In contrast, we showed that treating ancient DNA extracts with DNA phosphatase improved the amount of endogenous sequence information recovered per sequencing channel by up to 3.3-fold, while still providing molecular signatures of endogenous ancient DNA damage, including cytosine deamination and fragmentation by depurination. Additionally, we confirmed the existence of molecular preservation niches in large bone crystals from which DNA could be preferentially extracted. Conclusions We propose DNA phosphatase treatment as a mechanism to increase sequence coverage of ancient genomes when using Helicos tSMS as a sequencing platform. Together with mild denaturation temperatures that favor access to endogenous ancient templates over modern DNA contaminants, this simple preparation procedure can improve overall Helicos tSMS performance when damaged DNA templates are targeted. PMID:22574620

  8. Ancient DNA from nomads in 2500-year-old archeological sites of Pengyang, China.

    Science.gov (United States)

    Zhao, Yong-Bin; Li, Hong-Jie; Cai, Da-Wei; Li, Chun-Xiang; Zhang, Quan-Chao; Zhu, Hong; Zhou, Hui

    2010-04-01

    Six human remains (dating approximately 2500 years ago) were excavated from Pengyang, China, an area occupied by both ancient nomadic and farming people. The funerary objects found with these remains suggested they were nomads. To further confirm their ancestry, we analyzed both the maternal lineages and paternal lineages of the ancient DNA. From the mitochondrial DNA, six haplotypes were identified as three haplogroups: C, D4 and M10. The haplotype-sharing populations and phylogenetic analyses revealed that these individuals were closely associated with the ancient Xiongnu and modern northern Asians. Single-nucleotide polymorphism analysis of Y chromosomes from four male samples that were typed as haplogroup Q indicated that these people had originated in Siberia. These results show that these ancient people from Pengyang present a close genetic affinity to nomadic people, indicating that northern nomads had reached the Central Plain area of China nearly 2500 years ago.

  9. Ancient DNA, climatic change, and loss of genetic diversity in an endemic Patagonian mammal

    Science.gov (United States)

    Chan, Y.; Lacey, E.; Ramakrishnan, U.; Pearson, O.; Hadly, E.

    2004-12-01

    Understanding the response of animal populations to climatic change is essential for the future maintenance of biodiversity. One question that remains difficult to answer, and is particularly important to conservation, is how animals respond over time scales relevant to evolutionary change. Ancient DNA provides a unique opportunity to track animal response to Holocene climate change and to study species replacement patterns and genetic diversity over time. We used ancient DNA to compare response to climatic change in two species, C. sociabilis and C. haigi, over the last 8,000 years. Our study site, Cueva Traful, is a late-Holocene raptor roost in Parque Nacional Nahuel Huapi, Argentina. A lack of genetic diversity in modern C. sociabilis populations is indicative of past bottleneck events and a previous ancient DNA study found that it had remained genetically identical for at least 1000 years in the face of climatic change and human disturbance. Since Cueva Traful goes back further in time, our first goal was to examine genetic diversity in order to place a longer term historical perspective on the modern bottleneck. The second goal was to compare changes in genetic diversity in C. sociabilis to C. haigi a closely related species that may respond differently to climatic change. The use of ancient DNA presents unique challenges due to low copy number, environmental damage to template, and high contamination risk. Despite these challenges, ancient DNA provides a unique perspective on evolutionary history.

  10. Natural transformation of bacteria by fragmented, damaged and ancient DNA

    DEFF Research Database (Denmark)

    Overballe-Petersen, Søren

    Organisms release DNA both when they live and die. Eventually the DNA disintegrates entirely or it is re-metabolized. There is a constant deposition and decomposition that maintains an environmental pool with large quantities of extracellular DNA, some of which can be thousands of years old. The ...... in chemistry. In addition to qualitative DNA sequencing, statistical analysis of the numerous sequencing reads yields quantitative measurements of DNA modifying reactions....

  11. Is the ancient permafrost bacteria able to keep DNA stable?

    Indian Academy of Sciences (India)

    repair for cell structures (Brouchkov and Williams 2002) or preserve those otherwise prone to collapse because of the duration of their existence. If so, their mutation rates must be extremely low. This explains genome homology between ancient permafrost bacteria and modern strains. A number of publications as well as ...

  12. Crosslinks rather than strand breaks determine access to ancient DNA sequences from frozen sediments

    DEFF Research Database (Denmark)

    Hansen, Anders Johannes; Mitchell, D.L.; Wiuf, C.

    2006-01-01

    Diagenesis was studied in DNA obtained from Siberian permafrost (permanently frozen soil) ranging from 10 to 400 thousand years in age. Despite optimal preservation conditions, we found the sedimentary DNA to be severely modified by interstrand crosslinks, single and double stranded breaks......, and freely exposed sugar, phosphate, and hydroxyl groups. Intriguingly, interstrand crosslinks were found to accumulate about hundred times faster than single stranded breaks, suggesting that crosslinking rather than depurination is the primary limiting factor for ancient DNA amplification under frozen...... conditions. The results question the reliability of the commonly used models relying on depurination kinetics for predicting the long-term survival of DNA under permafrost conditions and suggest that new strategies for repair of ancient DNA must be considered if the yield of amplifiable DNA from permafrost...

  13. DNA barcoding of catfish: species authentication and phylogenetic assessment.

    Directory of Open Access Journals (Sweden)

    Li Lian Wong

    Full Text Available As the global market for fisheries and aquaculture products expands, mislabeling of these products has become a growing concern in the food safety arena. Molecular species identification techniques hold the potential for rapid, accurate assessment of proper labeling. Here we developed and evaluated DNA barcodes for use in differentiating United States domestic and imported catfish species. First, we sequenced 651 base-pair barcodes from the cytochrome oxidase I (COI gene from individuals of 9 species (and an Ictalurid hybrid of domestic and imported catfish in accordance with standard DNA barcoding protocols. These included domestic Ictalurid catfish, and representative imported species from the families of Clariidae and Pangasiidae. Alignment of individual sequences from within a given species revealed highly consistent barcodes (98% similarity on average. These alignments allowed the development and analyses of consensus barcode sequences for each species and comparison with limited sequences in public databases (GenBank and Barcode of Life Data Systems. Validation tests carried out in blinded studies and with commercially purchased catfish samples (both frozen and fresh revealed the reliability of DNA barcoding for differentiating between these catfish species. The developed protocols and consensus barcodes are valuable resources as increasing market and governmental scrutiny is placed on catfish and other fisheries and aquaculture products labeling in the United States.

  14. Enterobius vermicularis: ancient DNA from north and south American human coprolites

    Directory of Open Access Journals (Sweden)

    Iñiguez Alena M

    2003-01-01

    Full Text Available A molecular paleoparasitological diagnostic approach was developed for Enterobius vermicularis. Ancient DNA was extracted from 27 coprolites from archaeological sites in Chile and USA. Enzymatic amplification of human mtDNA sequences confirmed the human origin. We designed primers specific to the E. vermicularis 5S ribosomal RNA spacer region and they allowed reproducible polymerase chain reaction identification of ancient material. We suggested that the paleoparasitological microscopic identification could accompany molecular diagnosis, which also opens the possibility of sequence analysis to understand parasite-host evolution.

  15. Natural transformation of bacteria by fragmented, damaged and ancient DNA

    DEFF Research Database (Denmark)

    Overballe-Petersen, Søren

    . The degrading DNA is fragmented and damaged, often to less than one hundred base pairs. Such DNA is only recognized as microbial nutrients and is not considered as direct contributors to bacterial evolutionary processes. The main study shows natural transformation by very short DNA (≥20bp). Further we also show...... it by damaged short DNA with abasic sites, crosslinks, and miscoding lesions, which are the most common damages in environmental DNA. This is emphasized by successful natural transformation by 43,000-year-old DNA. We find that the process is a simple variant of natural transformation. On top, we illustrate...... with fullgenome comparisons that the process has general relevance in extant bacteria. Our findings reveal that the large environmental reservoir of short and damaged DNA retains capacity for natural transformation, even after thousands of years. This describes for the first time a process by which cells can...

  16. Comparison of Suitability of the Most Common Ancient DNA Quantification Methods.

    Science.gov (United States)

    Brzobohatá, Kristýna; Drozdová, Eva; Smutný, Jiří; Zeman, Tomáš; Beňuš, Radoslav

    2017-04-01

    Ancient DNA (aDNA) extracted from historical bones is damaged and fragmented into short segments, present in low quantity, and usually copurified with microbial DNA. A wide range of DNA quantification methods are available. The aim of this study was to compare the five most common DNA quantification methods for aDNA. Quantification methods were tested on DNA extracted from skeletal material originating from an early medieval burial site. The tested methods included ultraviolet (UV) absorbance, real-time quantitative polymerase chain reaction (qPCR) based on SYBR ® green detection, real-time qPCR based on a forensic kit, quantification via fluorescent dyes bonded to DNA, and fragmentary analysis. Differences between groups were tested using a paired t-test. Methods that measure total DNA present in the sample (NanoDrop ™ UV spectrophotometer and Qubit ® fluorometer) showed the highest concentrations. Methods based on real-time qPCR underestimated the quantity of aDNA. The most accurate method of aDNA quantification was fragmentary analysis, which also allows DNA quantification of the desired length and is not affected by PCR inhibitors. Methods based on the quantification of the total amount of DNA in samples are unsuitable for ancient samples as they overestimate the amount of DNA presumably due to the presence of microbial DNA. Real-time qPCR methods give undervalued results due to DNA damage and the presence of PCR inhibitors. DNA quantification methods based on fragment analysis show not only the quantity of DNA but also fragment length.

  17. Is amino acid racemization a useful tool for screening for ancient DNA in bone?

    Science.gov (United States)

    Collins, Matthew J; Penkman, Kirsty E H; Rohland, Nadin; Shapiro, Beth; Dobberstein, Reimer C; Ritz-Timme, Stefanie; Hofreiter, Michael

    2009-08-22

    Many rare and valuable ancient specimens now carry the scars of ancient DNA research, as questions of population genetics and phylogeography require larger sample sets. This fuels the demand for reliable techniques to screen for DNA preservation prior to destructive sampling. Only one such technique has been widely adopted: the extent of aspartic acid racemization (AAR). The kinetics of AAR are believed to be similar to the rate of DNA depurination and therefore a good measure of the likelihood of DNA survival. Moreover, AAR analysis is only minimally destructive. We report the first comprehensive test of AAR using 91 bone and teeth samples from temperate and high-latitude sites that were analysed for DNA. While the AAR range of all specimens was low (0.02-0.17), no correlation was found between the extent of AAR and DNA amplification success. Additional heating experiments and surveys of the literature indicated that d/l Asx is low in bones until almost all the collagen is lost. This is because aspartic acid is retained in the bone within the constrained environment of the collagen triple helix, where it cannot racemize for steric reasons. Only if the helix denatures to soluble gelatin can Asx racemize readily, but this soluble gelatine is readily lost in most burial environments. We conclude that Asx d/l is not a useful screening technique for ancient DNA from bone.

  18. Comparing the performance of three ancient DNA extraction methods for high-throughput sequencing.

    Science.gov (United States)

    Gamba, Cristina; Hanghøj, Kristian; Gaunitz, Charleen; Alfarhan, Ahmed H; Alquraishi, Saleh A; Al-Rasheid, Khaled A S; Bradley, Daniel G; Orlando, Ludovic

    2016-03-01

    The DNA molecules that can be extracted from archaeological and palaeontological remains are often degraded and massively contaminated with environmental microbial material. This reduces the efficacy of shotgun approaches for sequencing ancient genomes, despite the decreasing sequencing costs of high-throughput sequencing (HTS). Improving the recovery of endogenous molecules from the DNA extraction and purification steps could, thus, help advance the characterization of ancient genomes. Here, we apply the three most commonly used DNA extraction methods to five ancient bone samples spanning a ~30 thousand year temporal range and originating from a diversity of environments, from South America to Alaska. We show that methods based on the purification of DNA fragments using silica columns are more advantageous than in solution methods and increase not only the total amount of DNA molecules retrieved but also the relative importance of endogenous DNA fragments and their molecular diversity. Therefore, these methods provide a cost-effective solution for downstream applications, including DNA sequencing on HTS platforms. © 2015 John Wiley & Sons Ltd.

  19. Ancient pathogen DNA in human teeth and petrous bones

    DEFF Research Database (Denmark)

    Margaryan, Ashot; Hansen, Henrik B.; Rasmussen, Simon

    2018-01-01

    pestis. Based on shotgun sequencing data, four of these five plague victims showed clearly detectable levels of Y.pestis DNA in the teeth, whereas all the petrous bones failed to produce Y.pestis DNA above baseline levels. A broader comparative metagenomic analysis of teeth and petrous bones from 10...

  20. Ancient DNA investigations: A review on their significance in ...

    African Journals Online (AJOL)

    However, its degradation and post-mortem chemical alteration make difficult its quantification and amplification. Moreover the study of aDNA is challenging due to the contamination by exogenous current DNA. Recently, the progress of molecular techniques and the use of sophisticated approaches greatly improved the ratio ...

  1. DNA in ancient bone - where is it located and how should we extract it?

    DEFF Research Database (Denmark)

    Campos, Paula; Craig, Oliver E.; Turner-Walker, Gordon

    2012-01-01

    . The question arises as to whether this may be due to post-collection preservation or just an artefact of the extraction methods used in these different studies? In an attempt to resolve these questions, we examine the efficacy of DNA extraction methods, and the quality and quantity of DNA recovered from both......Despite the widespread use of bones in ancient DNA (aDNA) studies, relatively little concrete information exists in regard to how the DNA in mineralised collagen degrades, or where it survives in the material's architecture. While, at the macrostructural level, physical exclusion of microbes...... and other external contaminants may be an important feature, and, at the ultrastructural level, the adsorption of DNA to hydroxyapatite and/or binding of DNA to Type I collagen may stabilise the DNA, the relative contribution of each, and what other factors may be relevant, are unclear...

  2. Combining bleach and mild predigestion improves ancient DNA recovery from bones

    DEFF Research Database (Denmark)

    Boessenkool, Sanne; Hanghøj, Kristian Ebbesen; Nistelberger, Heidi M.

    2017-01-01

    aimed to improve ancient DNA recovery before library amplification have recently been developed. Here, we test the effects of combining two of such protocols, a bleach wash and a predigestion step, on 12 bone samples of Atlantic cod and domestic horse aged 750-1350 cal. years before present. Using high......-throughput sequencing, we show that combined together, bleach wash and predigestion consistently yield DNA libraries with higher endogenous content than either of these methods alone. Additionally, the molecular complexity of these libraries is improved and endogenous DNA templates show larger size distributions. Other...... library characteristics, such as DNA damage profiles or the composition of microbial communities, are little affected by the pre-extraction protocols. Application of the combined protocol presented in this study will facilitate the genetic analysis of an increasing number of ancient remains...

  3. Roche genome sequencer FLX based high-throughput sequencing of ancient DNA

    DEFF Research Database (Denmark)

    Alquezar-Planas, David E; Fordyce, Sarah Louise

    2012-01-01

    Since the development of so-called "next generation" high-throughput sequencing in 2005, this technology has been applied to a variety of fields. Such applications include disease studies, evolutionary investigations, and ancient DNA. Each application requires a specialized protocol to ensure tha...

  4. Computational analyses of ancient pathogen DNA from herbarium samples: challenges and prospects

    Directory of Open Access Journals (Sweden)

    Kentaro eYoshida

    2015-09-01

    Full Text Available The application of DNA sequencing technology to the study of ancient DNA has enabled the reconstruction of past epidemics from genomes of historically important plant-associated microbes. Recently, the genome sequences of the potato late blight pathogen Phytophthora infestans were analyzed from 19th century herbarium specimens. These herbarium samples originated from infected potatoes collected during and after the Irish potato famine. Herbaria have therefore great potential to help elucidate past epidemics of crops, date the emergence of pathogens, and inform about past pathogen population dynamics. DNA preservation in herbarium samples was unexpectedly good, raising the possibility of a whole new research area in plant and microbial genomics. However, the recovered DNA can be extremely fragmented resulting in specific challenges in reconstructing genome sequences. Here we review some of the challenges in computational analyses of ancient DNA from herbarium samples. We also applied the recently developed linkage method to haplotype reconstruction of diploid or polyploid genomes from fragmented ancient DNA.

  5. Ancient DNA: extraction, characterization, molecular cloning, and enzymatic amplification.

    OpenAIRE

    Pääbo, S

    1989-01-01

    Several chemical and enzymatic properties were examined in the DNA extracted from dry remains of soft tissues that vary in age from 4 to 13,000 years and represent four species, including two extinct animals (the marsupial wolf and giant ground sloth). The DNA obtained was invariably of a low average molecular size and damaged by oxidative processes, which primarily manifest themselves as modifications of pyrimidines and sugar residues as well as baseless sites and intermolecular cross-links....

  6. Investigating population continuity with ancient DNA under a spatially explicit simulation framework.

    Science.gov (United States)

    Silva, Nuno Miguel; Rio, Jeremy; Currat, Mathias

    2017-12-15

    Recent advances in sequencing technologies have allowed for the retrieval of ancient DNA data (aDNA) from skeletal remains, providing direct genetic snapshots from diverse periods of human prehistory. Comparing samples taken in the same region but at different times, hereafter called "serial samples", may indicate whether there is continuity in the peopling history of that area or whether an immigration of a genetically different population has occurred between the two sampling times. However, the exploration of genetic relationships between serial samples generally ignores their geographical locations and the spatiotemporal dynamics of populations. Here, we present a new coalescent-based, spatially explicit modelling approach to investigate population continuity using aDNA, which includes two fundamental elements neglected in previous methods: population structure and migration. The approach also considers the extensive temporal and geographical variance that is commonly found in aDNA population samples. We first showed that our spatially explicit approach is more conservative than the previous (panmictic) approach and should be preferred to test for population continuity, especially when small and isolated populations are considered. We then applied our method to two mitochondrial datasets from Germany and France, both including modern and ancient lineages dating from the early Neolithic. The results clearly reject population continuity for the maternal line over the last 7500 years for the German dataset but not for the French dataset, suggesting regional heterogeneity in post-Neolithic migratory processes. Here, we demonstrate the benefits of using a spatially explicit method when investigating population continuity with aDNA. It constitutes an improvement over panmictic methods by considering the spatiotemporal dynamics of genetic lineages and the precise location of ancient samples. The method can be used to investigate population continuity between any pair

  7. DNA Barcoding as a Reliable Method for the Authentication of Commercial Seafood Products

    Directory of Open Access Journals (Sweden)

    Silvia Nicolè

    2012-01-01

    Full Text Available Animal DNA barcoding allows researchers to identify different species by analyzing a short nucleotide sequence, typically the mitochondrial gene cox1. In this paper, we use DNA barcoding to genetically identify seafood samples that were purchased from various locations throughout Italy. We adopted a multi-locus approach to analyze the cob, 16S-rDNA and cox1 genes, and compared our sequences to reference sequences in the BOLD and GenBank online databases. Our method is a rapid and robust technique that can be used to genetically identify crustaceans, mollusks and fishes. This approach could be applied in the future for conservation, particularly for monitoring illegal trade of protected and endangered species. Additionally, this method could be used for authentication in order to detect mislabeling of commercially processed seafood.

  8. Ancient DNA: extraction, characterization, molecular cloning, and enzymatic amplification.

    Science.gov (United States)

    Pääbo, S

    1989-03-01

    Several chemical and enzymatic properties were examined in the DNA extracted from dry remains of soft tissues that vary in age from 4 to 13,000 years and represent four species, including two extinct animals (the marsupial wolf and giant ground sloth). The DNA obtained was invariably of a low average molecular size and damaged by oxidative processes, which primarily manifest themselves as modifications of pyrimidines and sugar residues as well as baseless sites and intermolecular cross-links. This renders molecular cloning difficult. However, the polymerase chain reaction can be used to amplify and study short mitochondrial DNA sequences that are of anthropological and evolutionary significance. This opens up the prospect of performing diachronical studies of molecular evolutionary genetics.

  9. Assessment of the Authenticity of Herbal Dietary Supplements: Comparison of Chemical and DNA Barcoding Methods.

    Science.gov (United States)

    Pawar, Rahul S; Handy, Sara M; Cheng, Raymond; Shyong, Nicole; Grundel, Erich

    2017-07-01

    About 7 % of the U. S. population reports using botanical dietary supplements. Increased use of such supplements has led to discussions related to their authenticity and quality. Reports of adulteration with substandard materials or pharmaceuticals are of concern because such substitutions, whether inadvertent or deliberate, may reduce the efficacy of specific botanicals or lead to adverse events. Methods for verifying the identity of botanicals include macroscopic and microscopic examinations, chemical analysis, and DNA-based methods including DNA barcoding. Macroscopic and microscopic examinations may fail when a supplement consists of botanicals that have been processed beyond the ability to provide morphological characterizations. Chemical analysis of specific marker compounds encounters problems when these compounds are not distinct to a given species or when purified reference standards are not available. Recent investigations describing DNA barcoding analysis of botanical dietary supplements have raised concerns about the authenticity of the supplements themselves as well as the appropriateness of using DNA barcoding techniques with finished botanical products. We collected 112 market samples of frequently consumed botanical dietary supplements of ginkgo, soy, valerian, yohimbe, and St. John's wort and analyzed each for specific chemical markers (i.e., flavonol glycosides, total isoflavones, total valerenic acids, yohimbine, and hypericins, respectively). We used traditional DNA barcoding techniques targeting the nuclear ITS2 gene and the chloroplast gene psb A- trn H on the same samples to determine the presence of DNA of the labelled ingredient. We compared the results obtained by both methods to assess the contribution of each in determining the identity of the samples. Georg Thieme Verlag KG Stuttgart · New York.

  10. Ancient DNA analysis identifies marine mollusc shells as new metagenomic archives of the past.

    Science.gov (United States)

    Der Sarkissian, Clio; Pichereau, Vianney; Dupont, Catherine; Ilsøe, Peter C; Perrigault, Mickael; Butler, Paul; Chauvaud, Laurent; Eiríksson, Jón; Scourse, James; Paillard, Christine; Orlando, Ludovic

    2017-09-01

    Marine mollusc shells enclose a wealth of information on coastal organisms and their environment. Their life history traits as well as (palaeo-) environmental conditions, including temperature, food availability, salinity and pollution, can be traced through the analysis of their shell (micro-) structure and biogeochemical composition. Adding to this list, the DNA entrapped in shell carbonate biominerals potentially offers a novel and complementary proxy both for reconstructing palaeoenvironments and tracking mollusc evolutionary trajectories. Here, we assess this potential by applying DNA extraction, high-throughput shotgun DNA sequencing and metagenomic analyses to marine mollusc shells spanning the last ~7,000 years. We report successful DNA extraction from shells, including a variety of ancient specimens, and find that DNA recovery is highly dependent on their biomineral structure, carbonate layer preservation and disease state. We demonstrate positive taxonomic identification of mollusc species using a combination of mitochondrial DNA genomes, barcodes, genome-scale data and metagenomic approaches. We also find shell biominerals to contain a diversity of microbial DNA from the marine environment. Finally, we reconstruct genomic sequences of organisms closely related to the Vibrio tapetis bacteria from Manila clam shells previously diagnosed with Brown Ring Disease. Our results reveal marine mollusc shells as novel genetic archives of the past, which opens new perspectives in ancient DNA research, with the potential to reconstruct the evolutionary history of molluscs, microbial communities and pathogens in the face of environmental changes. Other future applications include conservation of endangered mollusc species and aquaculture management. © 2017 John Wiley & Sons Ltd.

  11. Analysis of ancient DNA from coprolites: a perspective with random amplified polymorphic DNA-polymerase chain reaction approach

    Directory of Open Access Journals (Sweden)

    Iñiguez Alena M

    2003-01-01

    Full Text Available The aim of this work was to determine approaches that would improve the quality of ancient DNA (aDNA present in coprolites to enhance the possibility of success in retrieving specific sequence targets. We worked with coprolites from South American archaeological sites in Brazil and Chile dating up to 7,000 years ago. Using established protocols for aDNA extraction we obtained samples showing high degradation as usually happens with this kind of material. The reconstructive polymerization pretreatment was essential to overcome the DNA degradation and the serial dilutions helped with to prevent polymerase chain reaction (PCR inhibitors. Moreover, the random amplified polymorphic DNA-PCR has been shown to be a reliable technique for further experiments to recover specific aDNA sequences.

  12. Comparing ancient DNA preservation in petrous bone and tooth cementum

    DEFF Research Database (Denmark)

    Hansen, Henrik B.; Damgaard, Peter de Barros; Margaryan, Ashot

    2017-01-01

    preservation in these two substrates obtained from the same human skulls, across a range of different ages and preservation environments. Both substrates display significantly higher endogenous DNA content (average of 16.4% and 40.0% for teeth and petrous bones, respectively) than parietal skull bone (average...

  13. Is the ancient permafrost bacteria able to keep DNA stable?

    Indian Academy of Sciences (India)

    Navya

    According to the preliminary DNA analysis, bacterial cells collected from the relict permafrost appeared to be Bacillus sp. strains, which are close to modern bacteria at a molecular level. Therefore, a number of question raises. For example, are isolated bacteria as old as the permafrost itself or could contamination with more ...

  14. Characterising the potential of sheep wool for ancient DNA analyses

    DEFF Research Database (Denmark)

    Brandt, Luise Ørsted; Tranekjer, Lena D.; Mannering, Ulla

    2011-01-01

    can be PCR-amplified from wool derived from a variety of breeds, regardless of the body location or natural pigmentation. Furthermore, although DNA can be PCR-amplified from wool dyed with one of four common plant dyes (tansy, woad, madder, weld), the use of mordants such as alum or iron leads...

  15. Ancient DNA analysis identifies marine mollusc shells as new metagenomic archives of the past

    DEFF Research Database (Denmark)

    Der Sarkissian, Clio; Pichereau, Vianney; Dupont, Catherine

    2017-01-01

    -) structure and biogeochemical composition. Adding to this list, the DNA entrapped in shell carbonate biominerals potentially offers a novel and complementary proxy both for reconstructing palaeoenvironments and tracking mollusc evolutionary trajectories. Here, we assess this potential by applying DNA...... environment. Finally, we reconstruct genomic sequences of organisms closely related to the Vibrio tapetis bacteria from Manila clam shells previously diagnosed with Brown Ring Disease. Our results reveal marine mollusc shells as novel genetic archives of the past, which opens new perspectives in ancient DNA...

  16. Ancient mitochondrial DNA analyses of ascaris eggs discovered in coprolites from joseon tomb.

    Science.gov (United States)

    Oh, Chang Seok; Seo, Min; Hong, Jong Ha; Chai, Jong-Yil; Oh, Seung Whan; Park, Jun Bum; Shin, Dong Hoon

    2015-04-01

    Analysis of ancient DNA (aDNA) extracted from Ascaris is very important for understanding the phylogenetic lineage of the parasite species. When aDNAs obtained from a Joseon tomb (SN2-19-1) coprolite in which Ascaris eggs were identified were amplified with primers for cytochrome b (cyt b) and 18S small subunit ribosomal RNA (18S rRNA) gene, the outcome exhibited Ascaris specific amplicon bands. By cloning, sequencing, and analysis of the amplified DNA, we obtained information valuable for comprehending genetic lineage of Ascaris prevalent among pre-modern Joseon peoples.

  17. The Small and the Dead: A Review of Ancient DNA Studies Analysing Micromammal Species

    Directory of Open Access Journals (Sweden)

    Roseina Woods

    2017-11-01

    Full Text Available The field of ancient DNA (aDNA has recently been in a state of exponential growth, largely driven by the uptake of Next Generation Sequencing (NGS techniques. Much of this work has focused on the mammalian megafauna and ancient humans, with comparatively less studies looking at micromammal fauna, despite the potential of these species in testing evolutionary, environmental and taxonomic theories. Several factors make micromammal fauna ideally suited for aDNA extraction and sequencing. Micromammal subfossil assemblages often include the large number of individuals appropriate for population level analyses, and, furthermore, the assemblages are frequently found in cave sites where the constant temperature and sheltered environment provide favourable conditions for DNA preservation. This review looks at studies that include the use of aDNA in molecular analysis of micromammal fauna, in order to examine the wide array of questions that can be answered in the study of small mammals using new palaeogenetic techniques. This study highlights the bias in current aDNA studies and assesses the future use of aDNA as a tool for the study of micromammal fauna.

  18. Authentication of commercial candy ingredients using DNA PCR-cloning methodology.

    Science.gov (United States)

    Muñoz-Colmenero, Marta; Martínez, Jose Luis; Roca, Agustín; García-Vázquez, Eva

    2016-02-01

    Commercial candies are consumed by all population age sectors worldwide. Methods for quality control and composition authentication are therefore needed for best compliance with consumers' preferences. In this study applications of DNA-based methodology for candy quality control have been tested. Eighteen samples of commercial candies (marshmallows, gumdrops, jelly, sherbet, gelatin-based desserts) produced by five countries were analyzed to identify the component species by polymerase chain reaction, cloning and sequencing of 16S rRNA and ribulose -1,5-diphosphate carboxylase oxygenase genes, and the species determined from BLAST comparison with universal databases and phylogenetic analysis. Positive DNA extraction and amplification of the target genes were obtained for 94% of candies assayed, even those containing as little as candy labels only in a few products. DNA traces of undeclared species, including fish, were found in most samples, and two products were labeled as vegetarian but contained porcine DNA. Based on the inaccuracy found on the labels of sweets we recommend the use of DNA tests for quality control of these popular sweets. DNA tests have been useful in this field but next-generation sequencing methods could be more effective. © 2015 Society of Chemical Industry.

  19. Evidence of ancient DNA reveals the first European lineage in Iron Age Central China.

    Science.gov (United States)

    Xie, C Z; Li, C X; Cui, Y Q; Zhang, Q C; Fu, Y Q; Zhu, H; Zhou, H

    2007-07-07

    Various studies on ancient DNA have attempted to reconstruct population movement in Asia, with much interest focused on determining the arrival of European lineages in ancient East Asia. Here, we discuss our analysis of the mitochondrial DNA of human remains excavated from the Yu Hong tomb in Taiyuan, China, dated 1400 years ago. The burial style of this tomb is characteristic of Central Asia at that time. Our analysis shows that Yu Hong belonged to the haplogroup U5, one of the oldest western Eurasian-specific haplogroups, while his wife can be classified as haplogroup G, the type prevalent in East Asia. Our findings show that this man with European lineage arrived in Taiyuan approximately 1400 years ago, and most probably married a local woman. Haplogroup U5 was the first west Eurasian-specific lineage to be found in the central part of ancient China, and Taiyuan may be the easternmost location of the discovered remains of European lineage in ancient China.

  20. Ancient DNA Reveals That the Genetic Structure of the Northern Han Chinese Was Shaped Prior to 3,000 Years Ago

    Science.gov (United States)

    Zhang, Quan-Chao; Li, Hong-Jie; Cui, Ying-Qiu; Xu, Zhi; Jin, Li; Zhou, Hui; Zhu, Hong

    2015-01-01

    The Han Chinese are the largest ethnic group in the world, and their origins, development, and expansion are complex. Many genetic studies have shown that Han Chinese can be divided into two distinct groups: northern Han Chinese and southern Han Chinese. The genetic history of the southern Han Chinese has been well studied. However, the genetic history of the northern Han Chinese is still obscure. In order to gain insight into the genetic history of the northern Han Chinese, 89 human remains were sampled from the Hengbei site which is located in the Central Plain and dates back to a key transitional period during the rise of the Han Chinese (approximately 3,000 years ago). We used 64 authentic mtDNA data obtained in this study, 27 Y chromosome SNP data profiles from previously studied Hengbei samples, and genetic datasets of the current Chinese populations and two ancient northern Chinese populations to analyze the relationship between the ancient people of Hengbei and present-day northern Han Chinese. We used a wide range of population genetic analyses, including principal component analyses, shared mtDNA haplotype analyses, and geographic mapping of maternal genetic distances. The results show that the ancient people of Hengbei bore a strong genetic resemblance to present-day northern Han Chinese and were genetically distinct from other present-day Chinese populations and two ancient populations. These findings suggest that the genetic structure of northern Han Chinese was already shaped 3,000 years ago in the Central Plain area. PMID:25938511

  1. Ancient DNA provides new insight into the maternal lineages and domestication of Chinese donkeys.

    Science.gov (United States)

    Han, Lu; Zhu, Songbiao; Ning, Chao; Cai, Dawei; Wang, Kai; Chen, Quanjia; Hu, Songmei; Yang, Junkai; Shao, Jing; Zhu, Hong; Zhou, Hui

    2014-11-30

    The donkey (Equus asinus) is an important domestic animal that provides a reliable source of protein and method of transportation for many human populations. However, the process of domestication and the dispersal routes of the Chinese donkey are still unclear, as donkey remains are sparse in the archaeological record and often confused with horse remains. To explore the maternal origins and dispersal route of Chinese donkeys, both mitochondrial DNA D-loop and cytochrome b gene fragments of 21 suspected donkey remains from four archaeological sites in China were amplified and sequenced. Molecular methods of species identification show that 17 specimens were donkeys and three samples had the maternal genetic signature of horses. One sample that dates to about 20,000 years before present failed to amplify. In this study, the phylogenetic analysis reveals that ancient Chinese donkeys have high mitochondrial DNA diversity and two distinct mitochondrial maternal lineages, known as the Somali and Nubian lineages. These results indicate that the maternal origin of Chinese domestic donkeys was probably related to the African wild ass, which includes the Nubian wild ass (Equus africanus africanus) and the Somali wild ass (Equus africanus somaliensis). Combined with historical records, the results of this study implied that domestic donkeys spread into west and north China before the emergence of the Han dynasty. The number of Chinese domestic donkeys had increased primarily to meet demand for the expansion of trade, and they were likely used as commodities or for shipping goods along the Silk Road during the Tang Dynasty, when the Silk Road reached its golden age. This study is the first to provide valuable ancient animal DNA evidence for early trade between African and Asian populations. The ancient DNA analysis of Chinese donkeys also sheds light on the dynamic process of the maternal origin, domestication, and dispersal route of ancient Chinese donkeys.

  2. Joint Estimation of Contamination, Error and Demography for Nuclear DNA from Ancient Humans

    Science.gov (United States)

    Slatkin, Montgomery

    2016-01-01

    When sequencing an ancient DNA sample from a hominin fossil, DNA from present-day humans involved in excavation and extraction will be sequenced along with the endogenous material. This type of contamination is problematic for downstream analyses as it will introduce a bias towards the population of the contaminating individual(s). Quantifying the extent of contamination is a crucial step as it allows researchers to account for possible biases that may arise in downstream genetic analyses. Here, we present an MCMC algorithm to co-estimate the contamination rate, sequencing error rate and demographic parameters—including drift times and admixture rates—for an ancient nuclear genome obtained from human remains, when the putative contaminating DNA comes from present-day humans. We assume we have a large panel representing the putative contaminant population (e.g. European, East Asian or African). The method is implemented in a C++ program called ‘Demographic Inference with Contamination and Error’ (DICE). We applied it to simulations and genome data from ancient Neanderthals and modern humans. With reasonable levels of genome sequence coverage (>3X), we find we can recover accurate estimates of all these parameters, even when the contamination rate is as high as 50%. PMID:27049965

  3. Evidence of authentic DNA from Danish Viking Age skeletons untouched by humans for 1,000 years

    DEFF Research Database (Denmark)

    Melchior, Linea; Kivisild, Toomas; Lynnerup, Niels

    2008-01-01

    -PCR work was carried out in a "clean- laboratory" dedicated solely to ancient DNA work. Mitochondrial DNA was extracted and overlapping fragments spanning the HVR-1 region as well as diagnostic sites in the coding region were PCR amplified, cloned and sequenced. Consistent results were obtained...

  4. Time to Spread Your Wings: A Review of the Avian Ancient DNA Field

    Directory of Open Access Journals (Sweden)

    Alicia Grealy

    2017-07-01

    Full Text Available Ancient DNA (aDNA has the ability to inform the evolutionary history of both extant and extinct taxa; however, the use of aDNA in the study of avian evolution is lacking in comparison to other vertebrates, despite birds being one of the most species-rich vertebrate classes. Here, we review the field of “avian ancient DNA” by summarising the past three decades of literature on this topic. Most studies over this time have used avian aDNA to reconstruct phylogenetic relationships and clarify taxonomy based on the sequencing of a few mitochondrial loci, but recent studies are moving toward using a comparative genomics approach to address developmental and functional questions. Applying aDNA analysis with more practical outcomes in mind (such as managing conservation is another increasingly popular trend among studies that utilise avian aDNA, but the majority of these have yet to influence management policy. We find that while there have been advances in extracting aDNA from a variety of avian substrates including eggshell, feathers, and coprolites, there is a bias in the temporal focus; the majority of the ca. 150 studies reviewed here obtained aDNA from late Holocene (100–1000 yBP material, with few studies investigating Pleistocene-aged material. In addition, we identify and discuss several other issues within the field that require future attention. With more than one quarter of Holocene bird extinctions occurring in the last several hundred years, it is more important than ever to understand the mechanisms driving the evolution and extinction of bird species through the use of aDNA.

  5. Weighing the mass spectrometric evidence for authentic Tyrannosaurus rex collagen

    Science.gov (United States)

    Buckley, Mike; Walker, Angela; Ho, Simon Y. W.; Yang, Yue; Smith, Colin; Ashton, Peter; Oates, Jane Thomas; Cappellini, Enrico; Koon, Hannah; Penkman, Kirsty; Elsworth, Ben; Ashford, Dave; Solazzo, Caroline; Andrews, Phil; Strahler, John; Shapiro, Beth; Ostrom, Peggy; Gandhi, Hasand; Miller, Webb; Raney, Brian; Zylber, Maria Ines; Gilbert, M. Thomas P.; Prigodich, Richard V.; Ryan, Michael; Rijsdijk, Kenneth F.; Janoo, Anwar; Collins, Matthew J.

    2009-01-01

    We use authentication tests developed for ancient DNA to evaluate claims by Asara et al. of collagen peptide sequences recovered from mastodon and Tyrannosaurus rex fossils. Although the mastodon passes, absence of amino acid composition data, lack of evidence for peptide deamidation, and association of the α1(I) peptide sequences with amphibians not birds, suggests that T. rex does not. PMID:18174420

  6. Weighing the mass spectrometric evidence for authentic Tyrannosaurus rex collagen

    OpenAIRE

    Buckley, Mike; Walker, Angela; Ho, Simon Y. W.; Yang, Yue; Smith, Colin; Ashton, Peter; Oates, Jane Thomas; Cappellini, Enrico; Koon, Hannah; Penkman, Kirsty; Elsworth, Ben; Ashford, Dave; Solazzo, Caroline; Andrews, Phil; Strahler, John

    2008-01-01

    We use authentication tests developed for ancient DNA to evaluate claims by Asara et al. of collagen peptide sequences recovered from mastodon and Tyrannosaurus rex fossils. Although the mastodon passes, absence of amino acid composition data, lack of evidence for peptide deamidation, and association of the α1(I) peptide sequences with amphibians not birds, suggests that T. rex does not.

  7. Bacterial fumarase and L-malic acid are evolutionary ancient components of the DNA damage response

    Science.gov (United States)

    Singer, Esti; Silas, Yardena BH; Ben-Yehuda, Sigal

    2017-01-01

    Fumarase is distributed between two compartments of the eukaryotic cell. The enzyme catalyses the reversible conversion of fumaric to L-malic acid in mitochondria as part of the tricarboxylic acid (TCA) cycle, and in the cytosol/nucleus as part of the DNA damage response (DDR). Here, we show that fumarase of the model prokaryote Bacillus subtilis (Fum-bc) is induced upon DNA damage, co-localized with the bacterial DNA and is required for the DDR. Fum-bc can substitute for both eukaryotic functions in yeast. Furthermore, we found that the fumarase-dependent intracellular signaling of the B. subtilis DDR is achieved via production of L-malic acid, which affects the translation of RecN, the first protein recruited to DNA damage sites. This study provides a different evolutionary scenario in which the dual function of the ancient prokaryotic fumarase, led to its subsequent distribution into different cellular compartments in eukaryotes. PMID:29140245

  8. Ancient and modern DNA reveal dynamics of domestication and cross-continental dispersal of the dromedary

    Science.gov (United States)

    Almathen, Faisal; Charruau, Pauline; Mohandesan, Elmira; Mwacharo, Joram M.; Orozco-terWengel, Pablo; Pitt, Daniel; Abdussamad, Abdussamad M.; Uerpmann, Margarethe; Uerpmann, Hans-Peter; De Cupere, Bea; Magee, Peter; Alnaqeeb, Majed A.; Salim, Bashir; Raziq, Abdul; Dessie, Tadelle; Abdelhadi, Omer M.; Banabazi, Mohammad H.; Al-Eknah, Marzook; Walzer, Chris; Faye, Bernard; Hofreiter, Michael; Peters, Joris; Hanotte, Olivier

    2016-01-01

    Dromedaries have been fundamental to the development of human societies in arid landscapes and for long-distance trade across hostile hot terrains for 3,000 y. Today they continue to be an important livestock resource in marginal agro-ecological zones. However, the history of dromedary domestication and the influence of ancient trading networks on their genetic structure have remained elusive. We combined ancient DNA sequences of wild and early-domesticated dromedary samples from arid regions with nuclear microsatellite and mitochondrial genotype information from 1,083 extant animals collected across the species’ range. We observe little phylogeographic signal in the modern population, indicative of extensive gene flow and virtually affecting all regions except East Africa, where dromedary populations have remained relatively isolated. In agreement with archaeological findings, we identify wild dromedaries from the southeast Arabian Peninsula among the founders of the domestic dromedary gene pool. Approximate Bayesian computations further support the “restocking from the wild” hypothesis, with an initial domestication followed by introgression from individuals from wild, now-extinct populations. Compared with other livestock, which show a long history of gene flow with their wild ancestors, we find a high initial diversity relative to the native distribution of the wild ancestor on the Arabian Peninsula and to the brief coexistence of early-domesticated and wild individuals. This study also demonstrates the potential to retrieve ancient DNA sequences from osseous remains excavated in hot and dry desert environments. PMID:27162355

  9. Ancient DNA reveals differences in behaviour and sociality between brown bears and extinct cave bears.

    Science.gov (United States)

    Fortes, Gloria G; Grandal-d'Anglade, Aurora; Kolbe, Ben; Fernandes, Daniel; Meleg, Ioana N; García-Vázquez, Ana; Pinto-Llona, Ana C; Constantin, Silviu; de Torres, Trino J; Ortiz, Jose E; Frischauf, Christine; Rabeder, Gernot; Hofreiter, Michael; Barlow, Axel

    2016-10-01

    Ancient DNA studies have revolutionized the study of extinct species and populations, providing insights on phylogeny, phylogeography, admixture and demographic history. However, inferences on behaviour and sociality have been far less frequent. Here, we investigate the complete mitochondrial genomes of extinct Late Pleistocene cave bears and middle Holocene brown bears that each inhabited multiple geographically proximate caves in northern Spain. In cave bears, we find that, although most caves were occupied simultaneously, each cave almost exclusively contains a unique lineage of closely related haplotypes. This remarkable pattern suggests extreme fidelity to their birth site in cave bears, best described as homing behaviour, and that cave bears formed stable maternal social groups at least for hibernation. In contrast, brown bears do not show any strong association of mitochondrial lineage and cave, suggesting that these two closely related species differed in aspects of their behaviour and sociality. This difference is likely to have contributed to cave bear extinction, which occurred at a time in which competition for caves between bears and humans was likely intense and the ability to rapidly colonize new hibernation sites would have been crucial for the survival of a species so dependent on caves for hibernation as cave bears. Our study demonstrates the potential of ancient DNA to uncover patterns of behaviour and sociality in ancient species and populations, even those that went extinct many tens of thousands of years ago. © 2016 John Wiley & Sons Ltd.

  10. Comparison of Flow Injection MS, NMR, and DNA Sequencing: Methods for Identification and Authentication of Black Cohosh (Actaea racemosa)

    Science.gov (United States)

    Flow injection mass spectrometry (FIMS) and proton nuclear magnetic resonance spectrometry (1H-NMR), two metabolic fingerprinting methods, and DNA sequencing were used to identify and authenticate Actaea species. Initially, samples of Actaea racemosa L. from a single source were distinguished from ...

  11. Ancient mitogenomics

    DEFF Research Database (Denmark)

    Ho, Simon Y. W.; Gilbert, Tom

    2010-01-01

    The mitochondrial genome has been the traditional focus of most research into ancient DNA, owing to its high copy number and population-level variability. Despite this long-standing interest in mitochondrial DNA, it was only in 2001 that the first complete ancient mitogenomic sequences were obtai...

  12. SL1 RNA gene recovery from Enterobius vermicularis ancient DNA in pre-Columbian human coprolites.

    Science.gov (United States)

    Iñiguez, Alena Mayo; Reinhard, Karl; Carvalho Gonçalves, Marcelo Luiz; Ferreira, Luiz Fernando; Araújo, Adauto; Paulo Vicente, Ana Carolina

    2006-11-01

    Enterobius vermicularis, pinworm, is one of the most common helminths worldwide, infecting nearly a billion people at all socio-economic levels. In prehistoric populations the paleoparasitological findings show a pinworm homogeneous distribution among hunter-gatherers in North America, intensified with the advent of agriculture. This same increase also occurred in the transition from nomad hunter-gatherers to sedentary farmers in South America, although E. vermicularis infection encompasses only the ancient Andean peoples, with no record among the pre-Colombian populations in the South American lowlands. However, the outline of pinworm paleoepidemiology has been supported by microscopic finding of eggs recovered from coprolites. Since molecular techniques are precise and sensitive in detecting pathogen ancient DNA (aDNA), and also could provide insights into the parasite evolutionary history, in this work we have performed a molecular paleoparasitological study of E. vermicularis. aDNA was recovered and pinworm 5S rRNA spacer sequences were determined from pre-Columbian coprolites (4110 BC-AD 900) from four different North and South American archaeological sites. The sequence analysis confirmed E. vermicularis identity and revealed a similarity among ancient and modern sequences. Moreover, polymorphisms were identified at the relative positions 160, 173 and 180, in independent coprolite samples from Tulán, San Pedro de Atacama, Chile (1080-950 BC). We also verified the presence of peculiarities (Splicing leader (SL1) RNA sequence, spliced donor site, the Sm antigen biding site, and RNA secondary structure) which characterise the SL1 RNA gene. The analysis shows that the SL1 RNA gene of contemporary pinworms was present in pre-Columbian E. vermicularis by 6110 years ago. We were successful in detecting E. vermicularis aDNA even in coprolites without direct microscopic evidence of the eggs, improving the diagnosis of helminth infections in the past and further

  13. King penguin population on Macquarie Island recovers ancient DNA diversity after heavy exploitation in historic times.

    Science.gov (United States)

    Heupink, Tim H; van den Hoff, John; Lambert, David M

    2012-08-23

    Historically, king penguin populations on Macquarie Island have suffered greatly from human exploitation. Two large colonies on the island were drastically reduced to a single small colony as a result of harvesting for the blubber oil industry. However, recent conservation efforts have resulted in the king penguin population expanding in numbers and range to recolonize previous as well as new sites. Ancient DNA methods were used to estimate past genetic diversity and combined with studies of modern populations, we are now able to compare past levels of variation with extant populations on northern Macquarie Island. The ancient and modern populations are closely related and show a similar level of genetic diversity. These results suggest that the king penguin population has recovered past genetic diversity in just 80 years owing to conservation efforts, despite having seen the brink of extinction.

  14. The characterization of Helicobacter pylori DNA associated with ancient human remains recovered from a Canadian glacier.

    Directory of Open Access Journals (Sweden)

    Treena Swanston

    2011-02-01

    Full Text Available Helicobacter pylori is a gram-negative bacterium that colonizes the stomach of nearly half of the world's population. Genotypic characterization of H. pylori strains involves the analysis of virulence-associated genes, such as vacA, which has multiple alleles. Previous phylogenetic analyses have revealed a connection between modern H. pylori strains and the movement of ancient human populations. In this study, H. pylori DNA was amplified from the stomach tissue of the Kwäday Dän Ts'ìnchi individual. This ancient individual was recovered from the Samuel Glacier in Tatshenshini-Alsek Park, British Columbia, Canada on the traditional territory of the Champagne and Aishihik First Nations and radiocarbon dated to a timeframe of approximately AD 1670 to 1850. This is the first ancient H. pylori strain to be characterized with vacA sequence data. The Tatshenshini H. pylori strain has a potential hybrid vacA m2a/m1d middle (m region allele and a vacA s2 signal (s region allele. A vacA s2 allele is more commonly identified with Western strains, and this suggests that European strains were present in northwestern Canada during the ancient individual's time. Phylogenetic analysis indicated that the vacA m1d region of the ancient strain clusters with previously published novel Native American strains that are closely related to Asian strains. This indicates a past connection between the Kwäday Dän Ts'ìnchi individual and the ancestors who arrived in the New World thousands of years ago.

  15. Investigating the global dispersal of chickens in prehistory using ancient mitochondrial DNA signatures.

    Science.gov (United States)

    Storey, Alice A; Athens, J Stephen; Bryant, David; Carson, Mike; Emery, Kitty; deFrance, Susan; Higham, Charles; Huynen, Leon; Intoh, Michiko; Jones, Sharyn; Kirch, Patrick V; Ladefoged, Thegn; McCoy, Patrick; Morales-Muñiz, Arturo; Quiroz, Daniel; Reitz, Elizabeth; Robins, Judith; Walter, Richard; Matisoo-Smith, Elizabeth

    2012-01-01

    Data from morphology, linguistics, history, and archaeology have all been used to trace the dispersal of chickens from Asian domestication centers to their current global distribution. Each provides a unique perspective which can aid in the reconstruction of prehistory. This study expands on previous investigations by adding a temporal component from ancient DNA and, in some cases, direct dating of bones of individual chickens from a variety of sites in Europe, the Pacific, and the Americas. The results from the ancient DNA analyses of forty-eight archaeologically derived chicken bones provide support for archaeological hypotheses about the prehistoric human transport of chickens. Haplogroup E mtDNA signatures have been amplified from directly dated samples originating in Europe at 1000 B.P. and in the Pacific at 3000 B.P. indicating multiple prehistoric dispersals from a single Asian centre. These two dispersal pathways converged in the Americas where chickens were introduced both by Polynesians and later by Europeans. The results of this study also highlight the inappropriate application of the small stretch of D-loop, traditionally amplified for use in phylogenetic studies, to understanding discrete episodes of chicken translocation in the past. The results of this study lead to the proposal of four hypotheses which will require further scrutiny and rigorous future testing.

  16. Investigating the Global Dispersal of Chickens in Prehistory Using Ancient Mitochondrial DNA Signatures

    Science.gov (United States)

    Storey, Alice A.; Athens, J. Stephen; Bryant, David; Carson, Mike; Emery, Kitty; deFrance, Susan; Higham, Charles; Huynen, Leon; Intoh, Michiko; Jones, Sharyn; Kirch, Patrick V.; Ladefoged, Thegn; McCoy, Patrick; Morales-Muñiz, Arturo; Quiroz, Daniel; Reitz, Elizabeth; Robins, Judith; Walter, Richard; Matisoo-Smith, Elizabeth

    2012-01-01

    Data from morphology, linguistics, history, and archaeology have all been used to trace the dispersal of chickens from Asian domestication centers to their current global distribution. Each provides a unique perspective which can aid in the reconstruction of prehistory. This study expands on previous investigations by adding a temporal component from ancient DNA and, in some cases, direct dating of bones of individual chickens from a variety of sites in Europe, the Pacific, and the Americas. The results from the ancient DNA analyses of forty-eight archaeologically derived chicken bones provide support for archaeological hypotheses about the prehistoric human transport of chickens. Haplogroup E mtDNA signatures have been amplified from directly dated samples originating in Europe at 1000 B.P. and in the Pacific at 3000 B.P. indicating multiple prehistoric dispersals from a single Asian centre. These two dispersal pathways converged in the Americas where chickens were introduced both by Polynesians and later by Europeans. The results of this study also highlight the inappropriate application of the small stretch of D-loop, traditionally amplified for use in phylogenetic studies, to understanding discrete episodes of chicken translocation in the past. The results of this study lead to the proposal of four hypotheses which will require further scrutiny and rigorous future testing. PMID:22848352

  17. Ancient DNA reveals genetic connections between early Di-Qiang and Han Chinese.

    Science.gov (United States)

    Li, Jiawei; Zeng, Wen; Zhang, Ye; Ko, Albert Min-Shan; Li, Chunxiang; Zhu, Hong; Fu, Qiaomei; Zhou, Hui

    2017-12-04

    Ancient Di-Qiang people once resided in the Ganqing region of China, adjacent to the Central Plain area from where Han Chinese originated. While gene flow between the Di-Qiang and Han Chinese has been proposed, there is no evidence to support this view. Here we analyzed the human remains from an early Di-Qiang site (Mogou site dated ~4000 years old) and compared them to other ancient DNA across China, including an early Han-related site (Hengbei site dated ~3000 years old) to establish the underlying genetic relationship between the Di-Qiang and ancestors of Han Chinese. We found Mogou mtDNA haplogroups were highly diverse, comprising 14 haplogroups: A, B, C, D (D*, D4, D5), F, G, M7, M8, M10, M13, M25, N*, N9a, and Z. In contrast, Mogou males were all Y-DNA haplogroup O3a2/P201; specifically one male was further assigned to O3a2c1a/M117 using targeted unique regions on the non-recombining region of the Y-chromosome. We compared Mogou to 7 other ancient and 38 modern Chinese groups, in a total of 1793 individuals, and found that Mogou shared close genetic distances with Taojiazhai (a more recent Di-Qiang population), Hengbei, and Northern Han. We modeled their interactions using Approximate Bayesian Computation, and support was given to a potential admixture of ~13-18% between the Mogou and Northern Han around 3300-3800 years ago. Mogou harbors the earliest genetically identifiable Di-Qiang, ancestral to the Taojiazhai, and up to ~33% paternal and ~70% of its maternal haplogroups could be found in present-day Northern Han Chinese.

  18. Bona fide colour: DNA prediction of human eye and hair colour from ancient and contemporary skeletal remains

    NARCIS (Netherlands)

    J. Draus-Barini (Jolanta); S. Walsh (Susan); E. Pośpiech (Ewelina); T. Kupiec (Tomasz); H. Głab (Henryk); W. Branicki (Wojciech); M.H. Kayser (Manfred)

    2013-01-01

    textabstractBackground: DNA analysis of ancient skeletal remains is invaluable in evolutionary biology for exploring the history of species, including humans. Contemporary human bones and teeth, however, are relevant in forensic DNA analyses that deal with the identification of perpetrators, missing

  19. Ancient DNA reveals lack of continuity between neolithic hunter-gatherers and contemporary Scandinavians

    DEFF Research Database (Denmark)

    Malmström, Helena; Gilbert, M Thomas P; Thomas, Mark G

    2009-01-01

    The driving force behind the transition from a foraging to a farming lifestyle in prehistoric Europe (Neolithization) has been debated for more than a century [1-3]. Of particular interest is whether population replacement or cultural exchange was responsible [3-5]. Scandinavia holds a unique place...... of the two cultures in Scandinavia has been cited as an argument against population replacement between the Mesolithic and the present [7, 8]. Through analysis of DNA extracted from ancient Scandinavian human remains, we show that people of the Pitted Ware culture were not the direct ancestors of modern...

  20. The examination of ancient DNA: guidelines on precautions, controls, and sample processing

    Directory of Open Access Journals (Sweden)

    Scholz, M.

    2000-06-01

    Full Text Available The young discipline of palaeogenetics has developed into a successful and expectant field of archaeobiological research within the last decade. Palaeogenetic investigation (e.g. PCR, DNA sequencing of ancient specimens is, however, susceptible to falsification by the presence of contamination from more recent times. Contamination which can lead to amplification of non-authentic sequences is known to stem from several sources: (i human biomolecules derived from the persons performing the genetic experiments, perhaps also from the archeologists and other persons who have previously handled the specimens or (ii edaphic DNA sequences derived primarily from bacterial or fungal growth upon the specimen. A third source of contamination can arise from (iii substances used for conservation of specimens. Here we give advice on the correct processing of prehistoric bone samples when further molecular biological examination is required. Along with the demonstration of necessary precautions and working conditions, we further explain how an unequivocal DNA contamination monitoring is performed.

    La paleogenética se ha convertido en los últimos años en una disciplina coronada de éxito que ofrece grandes expectativas para el desarrollo de la investigación arqueobiológica. No obstante, la investigación paleogenética (p. ej: PCR, secuenciación del ADN de especímenes antiguos es susceptible de ser falsificada por la presencia de una contaminación más reciente. Actualmente sabemos que la contaminación que provoca la amplificación de secuencias ''no auténticas" procede de las siguientes fuentes: (i las biomoléculas humanas provienen de la persona que realiza el experimento genético o incluso también del arqueólogo u otras personas que previamente hayan tenido contacto con el espécimen; (ii de secuencias de ADN edáficas derivadas básicamente del crecimiento bacterial o fúngico en el seno del espécimen. La tercera fuente de contaminaci

  1. Mitochondrial DNA variation, but not nuclear DNA, sharply divides morphologically identical chameleons along an ancient geographic barrier.

    Directory of Open Access Journals (Sweden)

    Dan Bar Yaacov

    Full Text Available The Levant is an important migration bridge, harboring border-zones between Afrotropical and palearctic species. Accordingly, Chameleo chameleon, a common species throughout the Mediterranean basin, is morphologically divided in the southern Levant (Israel into two subspecies, Chamaeleo chamaeleon recticrista (CCR and C. c. musae (CCM. CCR mostly inhabits the Mediterranean climate (northern Israel, while CCM inhabits the sands of the north-western Negev Desert (southern Israel. AFLP analysis of 94 geographically well dispersed specimens indicated moderate genetic differentiation (PhiPT = 0.097, consistent with the classical division into the two subspecies, CCR and CCM. In contrast, sequence analysis of a 637 bp coding mitochondrial DNA (mtDNA fragment revealed two distinct phylogenetic clusters which were not consistent with the morphological division: one mtDNA cluster consisted of CCR specimens collected in regions northern of the Jezreel Valley and another mtDNA cluster harboring specimens pertaining to both the CCR and CCM subspecies but collected southern of the Jezreel Valley. AMOVA indicated clear mtDNA differentiation between specimens collected northern and southern to the Jezreel Valley (PhiPT = 0.79, which was further supported by a very low coalescent-based estimate of effective migration rates. Whole chameleon mtDNA sequencing (∼17,400 bp generated from 11 well dispersed geographic locations revealed 325 mutations sharply differentiating the two mtDNA clusters, suggesting a long allopatric history further supported by BEAST. This separation correlated temporally with the existence of an at least 1 million year old marine barrier at the Jezreel Valley exactly where the mtDNA clusters meet. We discuss possible involvement of gender-dependent life history differences in maintaining such mtDNA genetic differentiation and suggest that it reflects (ancient local adaptation to mitochondrial-related traits.

  2. Mitochondrial DNA Variation, but Not Nuclear DNA, Sharply Divides Morphologically Identical Chameleons along an Ancient Geographic Barrier

    Science.gov (United States)

    Zilka, Yael; Ovadia, Ofer; Bouskila, Amos; Mishmar, Dan

    2012-01-01

    The Levant is an important migration bridge, harboring border-zones between Afrotropical and palearctic species. Accordingly, Chameleo chameleon, a common species throughout the Mediterranean basin, is morphologically divided in the southern Levant (Israel) into two subspecies, Chamaeleo chamaeleon recticrista (CCR) and C. c. musae (CCM). CCR mostly inhabits the Mediterranean climate (northern Israel), while CCM inhabits the sands of the north-western Negev Desert (southern Israel). AFLP analysis of 94 geographically well dispersed specimens indicated moderate genetic differentiation (PhiPT = 0.097), consistent with the classical division into the two subspecies, CCR and CCM. In contrast, sequence analysis of a 637 bp coding mitochondrial DNA (mtDNA) fragment revealed two distinct phylogenetic clusters which were not consistent with the morphological division: one mtDNA cluster consisted of CCR specimens collected in regions northern of the Jezreel Valley and another mtDNA cluster harboring specimens pertaining to both the CCR and CCM subspecies but collected southern of the Jezreel Valley. AMOVA indicated clear mtDNA differentiation between specimens collected northern and southern to the Jezreel Valley (PhiPT = 0.79), which was further supported by a very low coalescent-based estimate of effective migration rates. Whole chameleon mtDNA sequencing (∼17,400 bp) generated from 11 well dispersed geographic locations revealed 325 mutations sharply differentiating the two mtDNA clusters, suggesting a long allopatric history further supported by BEAST. This separation correlated temporally with the existence of an at least 1 million year old marine barrier at the Jezreel Valley exactly where the mtDNA clusters meet. We discuss possible involvement of gender-dependent life history differences in maintaining such mtDNA genetic differentiation and suggest that it reflects (ancient) local adaptation to mitochondrial-related traits. PMID:22457709

  3. Ancient DNA from lake sediments: Bridging the gap between paleoecology and genetics

    Directory of Open Access Journals (Sweden)

    Lumibao Candice Y

    2011-01-01

    Full Text Available Abstract Background Quaternary plant ecology in much of the world has historically relied on morphological identification of macro- and microfossils from sediments of small freshwater lakes. Here, we report new protocols that reliably yield DNA sequence data from Holocene plant macrofossils and bulk lake sediment used to infer ecological change. This will allow changes in census populations, estimated from fossils and associated sediment, to be directly associated with population genetic changes. Results We successfully sequenced DNA from 64 samples (out of 126 comprised of bulk sediment and seeds, leaf fragments, budscales, and samaras extracted from Holocene lake sediments in the western Great Lakes region of North America. Overall, DNA yields were low. However, we were able to reliably amplify samples with as few as 10 copies of a short cpDNA fragment with little detectable PCR inhibition. Our success rate was highest for sediments Conclusions An ability to extract ancient DNA from Holocene sediments potentially allows exciting new insights into the genetic consequences of long-term environmental change. The low DNA copy numbers we found in fossil material and the discovery of multiple sequence variants from single macrofossil extractions highlight the need for careful experimental and laboratory protocols. Further application of these protocols should lead to better understanding of the ecological and evolutionary consequences of environmental change.

  4. Surveying the repair of ancient DNA from bones via high-throughput sequencing.

    Science.gov (United States)

    Mouttham, Nathalie; Klunk, Jennifer; Kuch, Melanie; Fourney, Ron; Poinar, Hendrik

    2015-07-01

    DNA damage in the form of abasic sites, chemically altered nucleotides, and strand fragmentation is the foremost limitation in obtaining genetic information from many ancient samples. Upon cell death, DNA continues to endure various chemical attacks such as hydrolysis and oxidation, but repair pathways found in vivo no longer operate. By incubating degraded DNA with specific enzyme combinations adopted from these pathways, it is possible to reverse some of the post-mortem nucleic acid damage prior to downstream analyses such as library preparation, targeted enrichment, and high-throughput sequencing. Here, we evaluate the performance of two available repair protocols on previously characterized DNA extracts from four mammoths. Both methods use endonucleases and glycosylases along with a DNA polymerase-ligase combination. PreCR Repair Mix increases the number of molecules converted to sequencing libraries, leading to an increase in endogenous content and a decrease in cytosine-to-thymine transitions due to cytosine deamination. However, the effects of Nelson Repair Mix on repair of DNA damage remain inconclusive.

  5. Use of ancient sedimentary DNA as a novel conservation tool for high-altitude tropical biodiversity.

    Science.gov (United States)

    Boessenkool, Sanne; McGlynn, Gayle; Epp, Laura S; Taylor, David; Pimentel, Manuel; Gizaw, Abel; Nemomissa, Sileshi; Brochmann, Christian; Popp, Magnus

    2014-04-01

    Conservation of biodiversity may in the future increasingly depend upon the availability of scientific information to set suitable restoration targets. In traditional paleoecology, sediment-based pollen provides a means to define preanthropogenic impact conditions, but problems in establishing the exact provenance and ecologically meaningful levels of taxonomic resolution of the evidence are limiting. We explored the extent to which the use of sedimentary ancient DNA (sedaDNA) may complement pollen data in reconstructing past alpine environments in the tropics. We constructed a record of afro-alpine plants retrieved from DNA preserved in sediment cores from 2 volcanic crater sites in the Albertine Rift, eastern Africa. The record extended well beyond the onset of substantial anthropogenic effects on tropical mountains. To ensure high-quality taxonomic inference from the sedaDNA sequences, we built an extensive DNA reference library covering the majority of the afro-alpine flora, by sequencing DNA from taxonomically verified specimens. Comparisons with pollen records from the same sediment cores showed that plant diversity recovered with sedaDNA improved vegetation reconstructions based on pollen records by revealing both additional taxa and providing increased taxonomic resolution. Furthermore, combining the 2 measures assisted in distinguishing vegetation change at different geographic scales; sedaDNA almost exclusively reflects local vegetation, whereas pollen can potentially originate from a wide area that in highlands in particular can span several ecozones. Our results suggest that sedaDNA may provide information on restoration targets and the nature and magnitude of human-induced environmental changes, including in high conservation priority, biodiversity hotspots, where understanding of preanthropogenic impact (or reference) conditions is highly limited. © 2013 Society for Conservation Biology.

  6. Increased mitochondrial DNA diversity in ancient Columbia River basin Chinook salmon Oncorhynchus tshawytscha.

    Directory of Open Access Journals (Sweden)

    Bobbi M Johnson

    Full Text Available The Columbia River and its tributaries provide essential spawning and rearing habitat for many salmonid species, including Chinook salmon (Oncorhynchus tshawytscha. Chinook salmon were historically abundant throughout the basin and Native Americans in the region relied heavily on these fish for thousands of years. Following the arrival of Europeans in the 1800s, salmon in the basin experienced broad declines linked to overfishing, water diversion projects, habitat destruction, connectivity reduction, introgression with hatchery-origin fish, and hydropower development. Despite historical abundance, many native salmonids are now at risk of extinction. Research and management related to Chinook salmon is usually explored under what are termed "the four H's": habitat, harvest, hatcheries, and hydropower; here we explore a fifth H, history. Patterns of prehistoric and contemporary mitochondrial DNA variation from Chinook salmon were analyzed to characterize and compare population genetic diversity prior to recent alterations and, thus, elucidate a deeper history for this species. A total of 346 ancient and 366 contemporary samples were processed during this study. Species was determined for 130 of the ancient samples and control region haplotypes of 84 of these were sequenced. Diversity estimates from these 84 ancient Chinook salmon were compared to 379 contemporary samples. Our analysis provides the first direct measure of reduced genetic diversity for Chinook salmon from the ancient to the contemporary period, as measured both in direct loss of mitochondrial haplotypes and reductions in haplotype and nucleotide diversity. However, these losses do not appear equal across the basin, with higher losses of diversity in the mid-Columbia than in the Snake subbasin. The results are unexpected, as the two groups were predicted to share a common history as parts of the larger Columbia River Basin, and instead indicate that Chinook salmon in these subbasins

  7. Integrating archaeology and ancient DNA analysis to address invasive species colonization in the Gulf of Alaska.

    Science.gov (United States)

    West, Catherine; Hofman, Courtney A; Ebbert, Steve; Martin, John; Shirazi, Sabrina; Dunning, Samantha; Maldonado, Jesus E

    2017-10-01

    The intentional and unintentional movement of plants and animals by humans has transformed ecosystems and landscapes globally. Assessing when and how a species was introduced are central to managing these transformed landscapes, particularly in island environments. In the Gulf of Alaska, there is considerable interest in the history of mammal introductions and rehabilitating Gulf of Alaska island environments by eradicating mammals classified as invasive species. The Arctic ground squirrel (Urocitellus parryii) is of concern because it affects vegetation and seabirds on Gulf of Alaska islands. This animal is assumed to have been introduced by historic settlers; however, ground squirrel remains in the prehistoric archaeological record of Chirikof Island, Alaska, challenge this timeline and suggest they colonized the islands long ago. We used 3 lines of evidence to address this problem: direct radiocarbon dating of archaeological squirrel remains; evidence of prehistoric human use of squirrels; and ancient DNA analysis of dated squirrel remains. Chirikof squirrels dated to at least 2000 years ago, and cut marks on squirrel bones suggested prehistoric use by people. Ancient squirrels also shared a mitochondrial haplotype with modern Chirikof squirrels. These results suggest that squirrels have been on Chirikof longer than previously assumed and that the current population of squirrels is closely related to the ancient population. Thus, it appears ground squirrels are not a recent, human-mediated introduction and may have colonized the island via a natural dispersal event or an ancient human translocation. © 2016 The Authors. Conservation Biology published by Wiley Periodicals, Inc. on behalf of Society for Conservation Biology.

  8. Increased mitochondrial DNA diversity in ancient Columbia River basin Chinook salmon Oncorhynchus tshawytscha.

    Science.gov (United States)

    Johnson, Bobbi M; Kemp, Brian M; Thorgaard, Gary H

    2018-01-01

    The Columbia River and its tributaries provide essential spawning and rearing habitat for many salmonid species, including Chinook salmon (Oncorhynchus tshawytscha). Chinook salmon were historically abundant throughout the basin and Native Americans in the region relied heavily on these fish for thousands of years. Following the arrival of Europeans in the 1800s, salmon in the basin experienced broad declines linked to overfishing, water diversion projects, habitat destruction, connectivity reduction, introgression with hatchery-origin fish, and hydropower development. Despite historical abundance, many native salmonids are now at risk of extinction. Research and management related to Chinook salmon is usually explored under what are termed "the four H's": habitat, harvest, hatcheries, and hydropower; here we explore a fifth H, history. Patterns of prehistoric and contemporary mitochondrial DNA variation from Chinook salmon were analyzed to characterize and compare population genetic diversity prior to recent alterations and, thus, elucidate a deeper history for this species. A total of 346 ancient and 366 contemporary samples were processed during this study. Species was determined for 130 of the ancient samples and control region haplotypes of 84 of these were sequenced. Diversity estimates from these 84 ancient Chinook salmon were compared to 379 contemporary samples. Our analysis provides the first direct measure of reduced genetic diversity for Chinook salmon from the ancient to the contemporary period, as measured both in direct loss of mitochondrial haplotypes and reductions in haplotype and nucleotide diversity. However, these losses do not appear equal across the basin, with higher losses of diversity in the mid-Columbia than in the Snake subbasin. The results are unexpected, as the two groups were predicted to share a common history as parts of the larger Columbia River Basin, and instead indicate that Chinook salmon in these subbasins may have divergent

  9. Increased mitochondrial DNA diversity in ancient Columbia River basin Chinook salmon Oncorhynchus tshawytscha

    Science.gov (United States)

    Kemp, Brian M.; Thorgaard, Gary H.

    2018-01-01

    The Columbia River and its tributaries provide essential spawning and rearing habitat for many salmonid species, including Chinook salmon (Oncorhynchus tshawytscha). Chinook salmon were historically abundant throughout the basin and Native Americans in the region relied heavily on these fish for thousands of years. Following the arrival of Europeans in the 1800s, salmon in the basin experienced broad declines linked to overfishing, water diversion projects, habitat destruction, connectivity reduction, introgression with hatchery-origin fish, and hydropower development. Despite historical abundance, many native salmonids are now at risk of extinction. Research and management related to Chinook salmon is usually explored under what are termed “the four H’s”: habitat, harvest, hatcheries, and hydropower; here we explore a fifth H, history. Patterns of prehistoric and contemporary mitochondrial DNA variation from Chinook salmon were analyzed to characterize and compare population genetic diversity prior to recent alterations and, thus, elucidate a deeper history for this species. A total of 346 ancient and 366 contemporary samples were processed during this study. Species was determined for 130 of the ancient samples and control region haplotypes of 84 of these were sequenced. Diversity estimates from these 84 ancient Chinook salmon were compared to 379 contemporary samples. Our analysis provides the first direct measure of reduced genetic diversity for Chinook salmon from the ancient to the contemporary period, as measured both in direct loss of mitochondrial haplotypes and reductions in haplotype and nucleotide diversity. However, these losses do not appear equal across the basin, with higher losses of diversity in the mid-Columbia than in the Snake subbasin. The results are unexpected, as the two groups were predicted to share a common history as parts of the larger Columbia River Basin, and instead indicate that Chinook salmon in these subbasins may have

  10. Using ancient DNA and coalescent-based methods to infer extinction.

    Science.gov (United States)

    Chang, Dan; Shapiro, Beth

    2016-02-01

    DNA sequences extracted from preserved remains can add considerable resolution to inference of past population dynamics. For example, coalescent-based methods have been used to correlate declines in some arctic megafauna populations with habitat fragmentation during the last ice age. These methods, however, often fail to detect population declines preceding extinction, most likely owing to a combination of sparse sampling, uninformative genetic markers, and models that cannot account for the increasingly structured nature of populations as habitats decline. As ancient DNA research expands to include full-genome analyses, these data will provide greater resolution of the genomic consequences of environmental change and the genetic signatures of extinction. © 2016 The Author(s).

  11. Establishing the validity of domestication genes using DNA from ancient chickens

    Science.gov (United States)

    Girdland Flink, Linus; Allen, Richard; Barnett, Ross; Malmström, Helena; Peters, Joris; Eriksson, Jonas; Andersson, Leif; Dobney, Keith

    2014-01-01

    Modern domestic plants and animals are subject to human-driven selection for desired phenotypic traits and behavior. Large-scale genetic studies of modern domestic populations and their wild relatives have revealed not only the genetic mechanisms underlying specific phenotypic traits, but also allowed for the identification of candidate domestication genes. Our understanding of the importance of these genes during the initial stages of the domestication process traditionally rests on the assumption that robust inferences about the past can be made on the basis of modern genetic datasets. A growing body of evidence from ancient DNA studies, however, has revealed that ancient and even historic populations often bear little resemblance to their modern counterparts. Here, we test the temporal context of selection on specific genetic loci known to differentiate modern domestic chickens from their extant wild ancestors. We extracted DNA from 80 ancient chickens excavated from 12 European archaeological sites, dated from ∼280 B.C. to the 18th century A.D. We targeted three unlinked genetic loci: the mitochondrial control region, a gene associated with yellow skin color (β-carotene dioxygenase 2), and a putative domestication gene thought to be linked to photoperiod and reproduction (thyroid-stimulating hormone receptor, TSHR). Our results reveal significant variability in both nuclear genes, suggesting that the commonality of yellow skin in Western breeds and the near fixation of TSHR in all modern chickens took place only in the past 500 y. In addition, mitochondrial variation has increased as a result of recent admixture with exotic breeds. We conclude by emphasizing the perils of inferring the past from modern genetic data alone. PMID:24753608

  12. Establishing the validity of domestication genes using DNA from ancient chickens.

    Science.gov (United States)

    Girdland Flink, Linus; Allen, Richard; Barnett, Ross; Malmström, Helena; Peters, Joris; Eriksson, Jonas; Andersson, Leif; Dobney, Keith; Larson, Greger

    2014-04-29

    Modern domestic plants and animals are subject to human-driven selection for desired phenotypic traits and behavior. Large-scale genetic studies of modern domestic populations and their wild relatives have revealed not only the genetic mechanisms underlying specific phenotypic traits, but also allowed for the identification of candidate domestication genes. Our understanding of the importance of these genes during the initial stages of the domestication process traditionally rests on the assumption that robust inferences about the past can be made on the basis of modern genetic datasets. A growing body of evidence from ancient DNA studies, however, has revealed that ancient and even historic populations often bear little resemblance to their modern counterparts. Here, we test the temporal context of selection on specific genetic loci known to differentiate modern domestic chickens from their extant wild ancestors. We extracted DNA from 80 ancient chickens excavated from 12 European archaeological sites, dated from ∼ 280 B.C. to the 18th century A.D. We targeted three unlinked genetic loci: the mitochondrial control region, a gene associated with yellow skin color (β-carotene dioxygenase 2), and a putative domestication gene thought to be linked to photoperiod and reproduction (thyroid-stimulating hormone receptor, TSHR). Our results reveal significant variability in both nuclear genes, suggesting that the commonality of yellow skin in Western breeds and the near fixation of TSHR in all modern chickens took place only in the past 500 y. In addition, mitochondrial variation has increased as a result of recent admixture with exotic breeds. We conclude by emphasizing the perils of inferring the past from modern genetic data alone.

  13. Molecular Authentication of the Traditional Medicinal Plant "Lakshman Booti" (Smithia conferta Sm.) and Its Adulterants through DNA Barcoding.

    Science.gov (United States)

    Umdale, Suraj D; Kshirsagar, Parthraj R; Lekhak, Manoj M; Gaikwad, Nikhil B

    2017-07-01

    Smithia conferta Sm. is an annual herb widely used in Indian traditional medical practice and commonly known as "Lakshman booti" in Sanskrit. Morphological resemblance among the species of genus Smithia Aiton . leads to inaccurate identification and adulteration. This causes inconsistent therapeutic effects and also affects the quality of herbal medicine. This study aimed to generate potential barcode for authentication of S. conferta and its adulterants through DNA barcoding technique. Genomic DNA extracted from S. conferta and its adulterants was used as templates for polymerase chain reaction amplification of the barcoding regions. The amplicons were directed for sequencing, and species identification was conducted using BLASTn and unweighted pair-group method with arithmetic mean trees. In addition, the secondary structures of internal transcribed spacer (ITS) 2 region were predicted. The nucleotide sequence of ITS provides species-specific single nucleotide polymorphisms and sequence divergence (22%) than psb A- trn H (10.9%) and rbc L (3.1%) sequences. The ITS barcode indicates that S. conferta and Smithia sensitiva are closely related compared to other species. ITS is the most applicable barcode for molecular authentication of S. conferta , and further chloroplast barcodes should be tested for phylogenetic analysis of genus Smithia. The present investigation is the first effort of utilization of DNA barcode for molecular authentication of S. conferta and its adulterants. Also, this study expanded the application of the ITS2 sequence data in the authentication. The ITS has been proved as a potential and reliable candidate barcode for the authentication of S. conferta . Abbreviations used: BLASTn: Basic Local Alignment Search Tool for Nucleotide; MEGA: Molecular Evolutionary Genetic Analysis; EMBL: European Molecular Biology Laboratory; psb A- trn H: Photosystem II protein D1- stuctural RNA: His tRNA gene; rbcL: Ribulose 1,5 bi-phosphate carboxylase

  14. Ancient DNA Reveals Late Pleistocene Existence of Ostriches in Indian Sub-Continent.

    Directory of Open Access Journals (Sweden)

    Sonal Jain

    Full Text Available Ancient DNA (aDNA analysis of extinct ratite species is of considerable interest as it provides important insights into their origin, evolution, paleogeographical distribution and vicariant speciation in congruence with continental drift theory. In this study, DNA hotspots were detected in fossilized eggshell fragments of ratites (dated ≥25000 years B.P. by radiocarbon dating using confocal laser scanning microscopy (CLSM. DNA was isolated from five eggshell fragments and a 43 base pair (bp sequence of a 16S rRNA mitochondrial-conserved region was successfully amplified and sequenced from one of the samples. Phylogenetic analysis of the DNA sequence revealed a 92% identity of the fossil eggshells to Struthio camelus and their position basal to other palaeognaths, consistent with the vicariant speciation model. Our study provides the first molecular evidence for the presence of ostriches in India, complementing the continental drift theory of biogeographical movement of ostriches in India, and opening up a new window into the evolutionary history of ratites.

  15. DNA analysis of ancient dogs of the Americas: identifying possible founding haplotypes and reconstructing population histories.

    Science.gov (United States)

    Witt, Kelsey E; Judd, Kathleen; Kitchen, Andrew; Grier, Colin; Kohler, Timothy A; Ortman, Scott G; Kemp, Brian M; Malhi, Ripan S

    2015-02-01

    As dogs have traveled with humans to every continent, they can potentially serve as an excellent proxy when studying human migration history. Past genetic studies into the origins of Native American dogs have used portions of the hypervariable region (HVR) of mitochondrial DNA (mtDNA) to indicate that prior to European contact the dogs of Native Americans originated in Eurasia. In this study, we summarize past DNA studies of both humans and dogs to discuss their population histories in the Americas. We then sequenced a portion of the mtDNA HVR of 42 pre-Columbian dogs from three sites located in Illinois, coastal British Columbia, and Colorado, and identify four novel dog mtDNA haplotypes. Next, we analyzed a dataset comprised of all available ancient dog sequences from the Americas to infer the pre-Columbian population history of dogs in the Americas. Interestingly, we found low levels of genetic diversity for some populations consistent with the possibility of deliberate breeding practices. Furthermore, we identified multiple putative founding haplotypes in addition to dog haplotypes that closely resemble those of wolves, suggesting admixture with North American wolves or perhaps a second domestication of canids in the Americas. Notably, initial effective population size estimates suggest at least 1000 female dogs likely existed in the Americas at the time of the first known canid burial, and that population size increased gradually over time before stabilizing roughly 1200 years before present. Copyright © 2014 Elsevier Ltd. All rights reserved.

  16. Ancient DNA from an Early Neolithic Iberian population supports a pioneer colonization by first farmers.

    Science.gov (United States)

    Gamba, C; Fernández, E; Tirado, M; Deguilloux, M F; Pemonge, M H; Utrilla, P; Edo, M; Molist, M; Rasteiro, R; Chikhi, L; Arroyo-Pardo, E

    2012-01-01

    The Neolithic transition has been widely debated particularly regarding the extent to which this revolution implied a demographic expansion from the Near East. We attempted to shed some light on this process in northeastern Iberia by combining ancient DNA (aDNA) data from Early Neolithic settlers and published DNA data from Middle Neolithic and modern samples from the same region. We successfully extracted and amplified mitochondrial DNA from 13 human specimens, found at three archaeological sites dated back to the Cardial culture in the Early Neolithic (Can Sadurní and Chaves) and to the Late Early Neolithic (Sant Pau del Camp). We found that haplogroups with a low frequency in modern populations-N* and X1-are found at higher frequencies in our Early Neolithic population (∼31%). Genetic differentiation between Early and Middle Neolithic populations was significant (F(ST) ∼0.13, Ppopulation structure, as previously used in aDNA studies, are unlikely to explain the data. Our results are compatible with a pioneer colonization of northeastern Iberia at the Early Neolithic characterized by the arrival of small genetically distinctive groups, showing cultural and genetic connections with the Near East. © 2011 Blackwell Publishing Ltd.

  17. Ancient DNA evidence for the loss of a highly divergent brown bear clade during historical times.

    Science.gov (United States)

    Calvignac, Sebastien; Hughes, Sandrine; Tougard, Christelle; Michaux, Jacques; Thevenot, Michel; Philippe, Michel; Hamdine, Watik; Hänni, Catherine

    2008-04-01

    The genetic diversity of present-day brown bears (Ursus arctos) has been extensively studied over the years and appears to be geographically structured into five main clades. The question of the past diversity of the species has been recently addressed by ancient DNA studies that concluded to a relative genetic stability over the last 35,000 years. However, the post-last glacial maximum genetic diversity of the species still remains poorly documented, notably in the Old World. Here, we analyse Atlas brown bears, which became extinct during the Holocene period. A divergent brown bear mitochondrial DNA lineage not present in any of the previously studied modern or ancient bear samples was uncovered, suggesting that the diversity of U. arctos was larger in the past than it is now. Specifically, a significant portion (with respect to sequence divergence) of the intraspecific diversity of the brown bear was lost with the extinction of the Atlas brown bear after the Pleistocene/Holocene transition.

  18. Toward a new history and geography of human genes informed by ancient DNA.

    Science.gov (United States)

    Pickrell, Joseph K; Reich, David

    2014-09-01

    Genetic information contains a record of the history of our species, and technological advances have transformed our ability to access this record. Many studies have used genome-wide data from populations today to learn about the peopling of the globe and subsequent adaptation to local conditions. Implicit in this research is the assumption that the geographic locations of people today are informative about the geographic locations of their ancestors in the distant past. However, it is now clear that long-range migration, admixture, and population replacement subsequent to the initial out-of-Africa expansion have altered the genetic structure of most of the world's human populations. In light of this we argue that it is time to critically reevaluate current models of the peopling of the globe, as well as the importance of natural selection in determining the geographic distribution of phenotypes. We specifically highlight the transformative potential of ancient DNA. By accessing the genetic make-up of populations living at archaeologically known times and places, ancient DNA makes it possible to directly track migrations and responses to natural selection. Copyright © 2014 Elsevier Ltd. All rights reserved.

  19. Ancient mtDNA genetic variants modulate mtDNA transcription and replication.

    Directory of Open Access Journals (Sweden)

    Sarit Suissa

    2009-05-01

    Full Text Available Although the functional consequences of mitochondrial DNA (mtDNA genetic backgrounds (haplotypes, haplogroups have been demonstrated by both disease association studies and cell culture experiments, it is not clear which of the mutations within the haplogroup carry functional implications and which are "evolutionary silent hitchhikers". We set forth to study the functionality of haplogroup-defining mutations within the mtDNA transcription/replication regulatory region by in vitro transcription, hypothesizing that haplogroup-defining mutations occurring within regulatory motifs of mtDNA could affect these processes. We thus screened >2500 complete human mtDNAs representing all major populations worldwide for natural variation in experimentally established protein binding sites and regulatory regions comprising a total of 241 bp in each mtDNA. Our screen revealed 77/241 sites showing point mutations that could be divided into non-fixed (57/77, 74% and haplogroup/sub-haplogroup-defining changes (i.e., population fixed changes, 20/77, 26%. The variant defining Caucasian haplogroup J (C295T increased the binding of TFAM (Electro Mobility Shift Assay and the capacity of in vitro L-strand transcription, especially of a shorter transcript that maps immediately upstream of conserved sequence block 1 (CSB1, a region associated with RNA priming of mtDNA replication. Consistent with this finding, cybrids (i.e., cells sharing the same nuclear genetic background but differing in their mtDNA backgrounds harboring haplogroup J mtDNA had a >2 fold increase in mtDNA copy number, as compared to cybrids containing haplogroup H, with no apparent differences in steady state levels of mtDNA-encoded transcripts. Hence, a haplogroup J regulatory region mutation affects mtDNA replication or stability, which may partially account for the phenotypic impact of this haplogroup. Our analysis thus demonstrates, for the first time, the functional impact of particular mtDNA

  20. Ancient microbes from halite fluid inclusions: optimized surface sterilization and DNA extraction.

    Directory of Open Access Journals (Sweden)

    Krithivasan Sankaranarayanan

    Full Text Available Fluid inclusions in evaporite minerals (halite, gypsum, etc. potentially preserve genetic records of microbial diversity and changing environmental conditions of Earth's hydrosphere for nearly one billion years. Here we describe a robust protocol for surface sterilization and retrieval of DNA from fluid inclusions in halite that, unlike previously published methods, guarantees removal of potentially contaminating surface-bound DNA. The protocol involves microscopic visualization of cell structures, deliberate surface contamination followed by surface sterilization with acid and bleach washes, and DNA extraction using Amicon centrifugal filters. Methods were verified on halite crystals of four different ages from Saline Valley, California (modern, 36 ka, 64 ka, and 150 ka, with retrieval of algal and archaeal DNA, and characterization of the algal community using ITS1 sequences. The protocol we developed opens up new avenues for study of ancient microbial ecosystems in fluid inclusions, understanding microbial evolution across geological time, and investigating the antiquity of life on earth and other parts of the solar system.

  1. From Pharmacognosia to DNA-Based Medicinal Plant Authentication - Pharmacognosy through the Centuries.

    Science.gov (United States)

    Heinrich, Michael; Anagnostou, Sabine

    2017-10-01

    For centuries, pharmacognosy was essential for the identification, quality, purity, and, until the end of the 18th century, even for the efficacy of medicinal plants. Since the 19th century, it concentrated on authenticity, purity, quality and the analysis of active substances, and was established as an academic branch discipline within pharmacy and continuously developed into a modern, highly sophisticated science. Even though the paradigm in pharmacy changed in the 19th century with the discovery of morphine and concentrated on single substances that could be synthesized fast by the upcoming industry, medicinal plants always remained an important element of the Materia medica, and during the last decades, medicinal plants continue to be a source of remedies, and natural products are an inspiration for new medicine. In this research, pharmacognostic skills remain an essential element, both with regards to identity, quality assurance of botanicals (both herbal medicines and supplements), and the discovery and development of new medicines. Over the years, the specific pharmacognostical tools have changed dramatically, and most recently, DNA-based techniques have become another element of our spectrum of scientific methods. Georg Thieme Verlag KG Stuttgart · New York.

  2. An economic analysis of private incentives to adopt DNA barcoding technology for fish species authentication in Canada.

    Science.gov (United States)

    Ugochukwu, Albert I; Hobbs, Jill E; Phillips, Peter W B; Gray, Richard

    2015-12-01

    The increasing spate of species substitution and mislabelling in fish markets has become a concern to the public and a challenge to both the food industry and regulators. Species substitution and mislabelling within fish supply chains occurs because of price incentives to misrepresent products for economic gain. Emerging authenticity technologies, such as the DNA barcoding technology that has been used to identify plants and animal (particularly fish) species through DNA sequencing, offer a potential technological solution to this information problem. However, the adoption of these authenticity technologies depends also on economic factors. The present study uses economic welfare analysis to examine the effects of species substitution and mislabelling in fish markets, and examines the feasibility of the technology for a typical retail store in Canada. It is assumed that increased accuracy of the technology in detecting fraud and enforcement of legal penalties and other associated costs would be likely to discourage cheating. Empirical results suggest that DNA barcoding technology would be feasible presently for a typical retail store only if authentication is done in a third party laboratory, as it may not be feasible on an individual retail store level once fixed and other associated costs of the technology are considered.

  3. Archaeal community changes in Lateglacial lake sediments: Evidence from ancient DNA

    Science.gov (United States)

    Ahmed, Engy; Parducci, Laura; Unneberg, Per; Ågren, Rasmus; Schenk, Frederik; Rattray, Jayne E.; Han, Lu; Muschitiello, Francesco; Pedersen, Mikkel W.; Smittenberg, Rienk H.; Yamoah, Kweku Afrifa; Slotte, Tanja; Wohlfarth, Barbara

    2018-02-01

    The Lateglacial/early Holocene sediments from the ancient lake at Hässeldala Port, southern Sweden provide an important archive for the environmental and climatic shifts at the end of the last ice age and the transition into the present Interglacial. The existing multi-proxy data set highlights the complex interplay of physical and ecological changes in response to climatic shifts and lake status changes. Yet, it remains unclear how microorganisms, such as Archaea, which do not leave microscopic features in the sedimentary record, were affected by these climatic shifts. Here we present the metagenomic data set of Hässeldala Port with a special focus on the abundance and biodiversity of Archaea. This allows reconstructing for the first time the temporal succession of major Archaea groups between 13.9 and 10.8 ka BP by using ancient environmental DNA metagenomics and fossil archaeal cell membrane lipids. We then evaluate to which extent these findings reflect physical changes of the lake system, due to changes in lake-water summer temperature and seasonal lake-ice cover. We show that variations in archaeal composition and diversity were related to a variety of factors (e.g., changes in lake water temperature, duration of lake ice cover, rapid sediment infilling), which influenced bottom water conditions and the sediment-water interface. Methanogenic Archaea dominated during the Allerød and Younger Dryas pollen zones, when the ancient lake was likely stratified and anoxic for large parts of the year. The increase in archaeal diversity at the Younger Dryas/Holocene transition is explained by sediment infilling and formation of a mire/peatbog.

  4. Ancient genomics

    DEFF Research Database (Denmark)

    Der Sarkissian, Clio; Allentoft, Morten Erik; Avila Arcos, Maria del Carmen

    2015-01-01

    The past decade has witnessed a revolution in ancient DNA (aDNA) research. Although the field's focus was previously limited to mitochondrial DNA and a few nuclear markers, whole genome sequences from the deep past can now be retrieved. This breakthrough is tightly connected to the massive sequen...

  5. Ancient DNA from Nubian and Somali wild ass provides insights into donkey ancestry and domestication

    Science.gov (United States)

    Kimura, Birgitta; Marshall, Fiona B.; Chen, Shanyuan; Rosenbom, Sónia; Moehlman, Patricia D.; Tuross, Noreen; Sabin, Richard C.; Peters, Joris; Barich, Barbara; Yohannes, Hagos; Kebede, Fanuel; Teclai, Redae; Beja-Pereira, Albano; Mulligan, Connie J.

    2011-01-01

    Genetic data from extant donkeys (Equus asinus) have revealed two distinct mitochondrial DNA haplogroups, suggestive of two separate domestication events in northeast Africa about 5000 years ago. Without distinct phylogeographic structure in domestic donkey haplogroups and with little information on the genetic makeup of the ancestral African wild ass, however, it has been difficult to identify wild ancestors and geographical origins for the domestic mitochondrial clades. Our analysis of ancient archaeological and historic museum samples provides the first genetic information on the historic Nubian wild ass (Equus africanus africanus), Somali wild ass (Equus africanus somaliensis) and ancient donkey. The results demonstrate that the Nubian wild ass was an ancestor of the first donkey haplogroup. In contrast, the Somali wild ass has considerable mitochondrial divergence from the Nubian wild ass and domestic donkeys. These findings resolve the long-standing issue of the role of the Nubian wild ass in the domestication of the donkey, but raise new questions regarding the second ancestor for the donkey. Our results illustrate the complexity of animal domestication, and have conservation implications for critically endangered Nubian and Somali wild ass. PMID:20667880

  6. Ancient DNA reveals the Arctic origin of Viking Age cod from Haithabu, Germany.

    Science.gov (United States)

    Star, Bastiaan; Boessenkool, Sanne; Gondek, Agata T; Nikulina, Elena A; Hufthammer, Anne Karin; Pampoulie, Christophe; Knutsen, Halvor; André, Carl; Nistelberger, Heidi M; Dierking, Jan; Petereit, Christoph; Heinrich, Dirk; Jakobsen, Kjetill S; Stenseth, Nils Chr; Jentoft, Sissel; Barrett, James H

    2017-08-22

    Knowledge of the range and chronology of historic trade and long-distance transport of natural resources is essential for determining the impacts of past human activities on marine environments. However, the specific biological sources of imported fauna are often difficult to identify, in particular if species have a wide spatial distribution and lack clear osteological or isotopic differentiation between populations. Here, we report that ancient fish-bone remains, despite being porous, brittle, and light, provide an excellent source of endogenous DNA (15-46%) of sufficient quality for whole-genome reconstruction. By comparing ancient sequence data to that of modern specimens, we determine the biological origin of 15 Viking Age (800-1066 CE) and subsequent medieval (1066-1280 CE) Atlantic cod ( Gadus morhua ) specimens from excavation sites in Germany, Norway, and the United Kingdom. Archaeological context indicates that one of these sites was a fishing settlement for the procurement of local catches, whereas the other localities were centers of trade. Fish from the trade sites show a mixed ancestry and are statistically differentiated from local fish populations. Moreover, Viking Age samples from Haithabu, Germany, are traced back to the North East Arctic Atlantic cod population that has supported the Lofoten fisheries of Norway for centuries. Our results resolve a long-standing controversial hypothesis and indicate that the marine resources of the North Atlantic Ocean were used to sustain an international demand for protein as far back as the Viking Age.

  7. Recharacterization of ancient DNA miscoding lesions: insights in the era of sequencing-by-synthesis

    DEFF Research Database (Denmark)

    Gilbert, M Thomas P; Binladen, Jonas; Miller, Webb

    2007-01-01

    strand of origin of observed damage events. With the advent of emulsion-based clonal amplification (emPCR) and the sequencing-by-synthesis technology this has changed. In this paper we demonstrate how data produced on the Roche GS20 genome sequencer can determine miscoding lesion strands of origin....... Furthermore, considerable disagreement and speculation exists on which specific damage events underlie observed miscoding lesions. The root of the problem is that it has previously been difficult to assemble sufficient data to test the hypotheses, and near-impossible to accurately determine the specific......, and subsequently be interpreted to enable characterization of the aDNA damage behind the observed phenotypes. Through comparative analyses on 390,965 bp of modern chloroplast and 131,474 bp of ancient woolly mammoth GS20 sequence data we conclusively demonstrate that in this sample at least, a permafrost preserved...

  8. Radiocarbon-dating and ancient DNA reveal rapid replacement of extinct prehistoric penguins

    Science.gov (United States)

    Rawlence, Nicolas J.; Perry, George L. W.; Smith, Ian W. G.; Scofield, R. Paul; Tennyson, Alan J. D.; Matisoo-Smith, Elizabeth A.; Boessenkool, Sanne; Austin, Jeremy J.; Waters, Jonathan M.

    2015-03-01

    Prehistoric faunal extinctions dramatically reshaped biological assemblages around the world. However, the timing of such biotic shifts is often obscured by the fragmentary nature and limited temporal resolution of fossil records. We use radiocarbon-dating and ancient-DNA analysis of prehistoric (ca A.D. 1450-1834) Megadyptes penguin specimens to assess the time-frame of biological turnover in coastal New Zealand following human settlement. These data suggest that the final extirpation of the endemic Megadyptes waitaha, and subsequent replacement by the previously sub-Antarctic-limited Megadyptes antipodes, likely occurred within a narrow temporal window (e.g. a century or less). This transition represents one of the most rapid prehistoric faunal turnover events documented, and is likely linked to human demographic and cultural transitions during the 15th Century. Our results suggest that anthropogenic forces can trigger rapid biogeographic shifts.

  9. Tropical ancient DNA reveals relationships of the extinct Bahamian giant tortoise Chelonoidis alburyorum.

    Science.gov (United States)

    Kehlmaier, Christian; Barlow, Axel; Hastings, Alexander K; Vamberger, Melita; Paijmans, Johanna L A; Steadman, David W; Albury, Nancy A; Franz, Richard; Hofreiter, Michael; Fritz, Uwe

    2017-01-11

    Ancient DNA of extinct species from the Pleistocene and Holocene has provided valuable evolutionary insights. However, these are largely restricted to mammals and high latitudes because DNA preservation in warm climates is typically poor. In the tropics and subtropics, non-avian reptiles constitute a significant part of the fauna and little is known about the genetics of the many extinct reptiles from tropical islands. We have reconstructed the near-complete mitochondrial genome of an extinct giant tortoise from the Bahamas (Chelonoidis alburyorum) using an approximately 1 000-year-old humerus from a water-filled sinkhole (blue hole) on Great Abaco Island. Phylogenetic and molecular clock analyses place this extinct species as closely related to Galápagos (C. niger complex) and Chaco tortoises (C. chilensis), and provide evidence for repeated overseas dispersal in this tortoise group. The ancestors of extant Chelonoidis species arrived in South America from Africa only after the opening of the Atlantic Ocean and dispersed from there to the Caribbean and the Galápagos Islands. Our results also suggest that the anoxic, thermally buffered environment of blue holes may enhance DNA preservation, and thus are opening a window for better understanding evolution and population history of extinct tropical species, which would likely still exist without human impact. © 2017 The Author(s).

  10. Paging through history: parchment as a reservoir of ancient DNA for next generation sequencing.

    Science.gov (United States)

    Teasdale, M D; van Doorn, N L; Fiddyment, S; Webb, C C; O'Connor, T; Hofreiter, M; Collins, M J; Bradley, D G

    2015-01-19

    Parchment represents an invaluable cultural reservoir. Retrieving an additional layer of information from these abundant, dated livestock-skins via the use of ancient DNA (aDNA) sequencing has been mooted by a number of researchers. However, prior PCR-based work has indicated that this may be challenged by cross-individual and cross-species contamination, perhaps from the bulk parchment preparation process. Here we apply next generation sequencing to two parchments of seventeenth and eighteenth century northern English provenance. Following alignment to the published sheep, goat, cow and human genomes, it is clear that the only genome displaying substantial unique homology is sheep and this species identification is confirmed by collagen peptide mass spectrometry. Only 4% of sequence reads align preferentially to a different species indicating low contamination across species. Moreover, mitochondrial DNA sequences suggest an upper bound of contamination at 5%. Over 45% of reads aligned to the sheep genome, and even this limited sequencing exercise yield 9 and 7% of each sampled sheep genome post filtering, allowing the mapping of genetic affinity to modern British sheep breeds. We conclude that parchment represents an excellent substrate for genomic analyses of historical livestock.

  11. Invader or resident? Ancient-DNA reveals rapid species turnover in New Zealand little penguins.

    Science.gov (United States)

    Grosser, Stefanie; Rawlence, Nicolas J; Anderson, Christian N K; Smith, Ian W G; Scofield, R Paul; Waters, Jonathan M

    2016-02-10

    The expansion of humans into previously unoccupied parts of the globe is thought to have driven the decline and extinction of numerous vertebrate species. In New Zealand, human settlement in the late thirteenth century AD led to the rapid demise of a distinctive vertebrate fauna, and also a number of 'turnover' events where extinct lineages were subsequently replaced by closely related taxa. The recent genetic detection of an Australian little penguin (Eudyptula novaehollandiae) in southeastern New Zealand may potentially represent an additional 'cryptic' invasion. Here we use ancient-DNA (aDNA) analysis and radiocarbon dating of pre-human, archaeological and historical Eudyptula remains to reveal that the arrival of E. novaehollandiae in New Zealand probably occurred between AD 1500 and 1900, following the anthropogenic decline of its sister taxon, the endemic Eudyptula minor. This rapid turnover event, revealed by aDNA, suggests that native species decline can be masked by invasive taxa, and highlights the potential for human-mediated biodiversity shifts. © 2016 The Author(s).

  12. DNA typing of ancient parasite eggs from environmental samples identifies human and animal worm infections in Viking-age settlement

    DEFF Research Database (Denmark)

    Søe, Martin Jensen; Fredensborg, Brian Lund; Nejsum, Peter

    paleoparasitological techniques such as morphological examination and molecular identification. Hard-shelled parasite eggs can be recovered from the environment even after extended periods of time and they have shown to be excellent reservoirs of ancient DNA (aDNA). aDNA analysis has enabled identifying which species...... parasite eggs from environmental samples collected at a Viking-age settlement (1018-1030 A.D.) are DNA typed to the species level. The human whipworm (Trichuris trichiura) and the human roundworm (Ascaris lumbricoides) are identified indicating that these parasites were endemic in Denmark in the Viking...

  13. Investigation of ancient DNA from Western Siberia and the Sargat culture.

    Science.gov (United States)

    Bennett, Casey C; Kaestle, Frederika A

    2010-04-01

    Mitochondrial DNA from 14 archaeological samples at the Ural State University in Yekaterinburg, Russia, was extracted to test the feasibility of ancient DNA work on their collection. These samples come from a number of sites that fall into two groupings. Seven samples are from three sites, dating to the 8th-12th century AD, that belong to a northern group of what are thought to be Ugrians, who lived along the Ural Mountains in northwestern Siberia. The remaining seven samples are from two sites that belong to a southern group representing the Sargat culture, dating between roughly the 5th century BC and the 5th century AD, from southwestern Siberia near the Ural Mountains and the present-day Kazakhstan border. The samples are derived from several burial types, including kurgan burials. They also represent a number of different skeletal elements and a range of observed preservation. The northern sites repeatedly failed to amplify after multiple extraction and amplification attempts, but the samples from the southern sites were successfully extracted and amplified. The sequences obtained from the southern sites support the hypothesis that the Sargat culture was a potential zone of intermixture between native Ugrian and/or Siberian populations and steppe peoples from the south, possibly early Iranian or Indo-Iranian, which has been previously suggested by archaeological analysis.

  14. The genetic impact of Aztec imperialism: ancient mitochondrial DNA evidence from Xaltocan, Mexico.

    Science.gov (United States)

    Mata-Míguez, Jaime; Overholtzer, Lisa; Rodríguez-Alegría, Enrique; Kemp, Brian M; Bolnick, Deborah A

    2012-12-01

    In AD 1428, the city-states of Tenochtitlan, Texcoco, and Tlacopan formed the Triple Alliance, laying the foundations of the Aztec empire. Although it is well documented that the Aztecs annexed numerous polities in the Basin of Mexico over the following years, the demographic consequences of this expansion remain unclear. At the city-state capital of Xaltocan, 16th century documents suggest that the site's conquest and subsequent incorporation into the Aztec empire led to a replacement of the original Otomí population, whereas archaeological evidence suggests that some of the original population may have remained at the town under Aztec rule. To help address questions about Xaltocan's demographic history during this period, we analyzed ancient DNA from 25 individuals recovered from three houses rebuilt over time and occupied between AD 1240 and 1521. These individuals were divided into two temporal groups that predate and postdate the site's conquest. We determined the mitochondrial DNA haplogroup of each individual and identified haplotypes based on 372 base pair sequences of first hypervariable region. Our results indicate that the residents of these houses before and after the Aztec conquest have distinct haplotypes that are not closely related, and the mitochondrial compositions of the temporal groups are statistically different. Altogether, these results suggest that the matrilines present in the households were replaced following the Aztec conquest. This study therefore indicates that the Aztec expansion may have been associated with significant demographic and genetic changes within Xaltocan. Copyright © 2012 Wiley Periodicals, Inc.

  15. Use DNA to learn from the past: how modern and ancient DNA studies may help reveal the past and predict the future distribution of species

    Science.gov (United States)

    Edwards, M. E.; Alsos, I. G.; Sjögren, P.; Coissac, E.; Gielly, L.; Yoccoz, N.; Føreid, M. K.; Taberlet, P.

    2015-12-01

    Knowledge of how climate change affected species distribution in the past may help us predict the effect of ongoing environmental changes. We explore how the use of modern (AFLP fingerprinting techniques) and ancient DNA (metabarcoding P6 loop of chloroplast DNA) help to reveal past distribution of vascular plant species, dispersal processes, and effect of species traits. Based on studies of modern DNA combined with species distribution models, we show the dispersal routes and barriers to dispersal throughout the circumarctic/circumboreal region, likely dispersal vectors, the cost of dispersal in term of loss of genetic diversity, and how these relates to species traits, dispersal distance, and size of colonized region. We also estimate the expected future distribution and loss of genetic diversity and show how this relates to life form and adaptations to dispersal. To gain more knowledge on time lags in past range change events, we rely on palaeorecords. Current data on past distribution are limited by the taxonomic and time resolution of macrofossil and pollen records. We show how this may be improved by studying ancient DNA of lake sediments. DNA of lake sediments recorded about half of the flora surrounding the lake. Compared to macrofossil, the taxonomic resolution is similar but the detection rate is considerable improved. By taking into account main determinants of founder effect, dispersal vectors, and dispersal lags, we may improve our ability to forecast effects of climate change, whereas more studies on ancient DNA may provide us with knowledge on distribution time lags.

  16. Authentication of Cordyceps sinensis by DNA Analyses: Comparison of ITS Sequence Analysis and RAPD-Derived Molecular Markers

    Directory of Open Access Journals (Sweden)

    Kelly Y. C. Lam

    2015-12-01

    Full Text Available Cordyceps sinensis is an endoparasitic fungus widely used as a tonic and medicinal food in the practice of traditional Chinese medicine (TCM. In historical usage, Cordyceps specifically is referring to the species of C. sinensis. However, a number of closely related species are named themselves as Cordyceps, and they are sold commonly as C. sinensis. The substitutes and adulterants of C. sinensis are often introduced either intentionally or accidentally in the herbal market, which seriously affects the therapeutic effects or even leads to life-threatening poisoning. Here, we aim to identify Cordyceps by DNA sequencing technology. Two different DNA-based approaches were compared. The internal transcribed spacer (ITS sequences and the random amplified polymorphic DNA (RAPD-sequence characterized amplified region (SCAR were developed here to authenticate different species of Cordyceps. Both approaches generally enabled discrimination of C. sinensis from others. The application of the two methods, supporting each other, increases the security of identification. For better reproducibility and faster analysis, the SCAR markers derived from the RAPD results provide a new method for quick authentication of Cordyceps.

  17. Authentication of Cordyceps sinensis by DNA Analyses: Comparison of ITS Sequence Analysis and RAPD-Derived Molecular Markers.

    Science.gov (United States)

    Lam, Kelly Y C; Chan, Gallant K L; Xin, Gui-Zhong; Xu, Hong; Ku, Chuen-Fai; Chen, Jian-Ping; Yao, Ping; Lin, Huang-Quan; Dong, Tina T X; Tsim, Karl W K

    2015-12-15

    Cordyceps sinensis is an endoparasitic fungus widely used as a tonic and medicinal food in the practice of traditional Chinese medicine (TCM). In historical usage, Cordyceps specifically is referring to the species of C. sinensis. However, a number of closely related species are named themselves as Cordyceps, and they are sold commonly as C. sinensis. The substitutes and adulterants of C. sinensis are often introduced either intentionally or accidentally in the herbal market, which seriously affects the therapeutic effects or even leads to life-threatening poisoning. Here, we aim to identify Cordyceps by DNA sequencing technology. Two different DNA-based approaches were compared. The internal transcribed spacer (ITS) sequences and the random amplified polymorphic DNA (RAPD)-sequence characterized amplified region (SCAR) were developed here to authenticate different species of Cordyceps. Both approaches generally enabled discrimination of C. sinensis from others. The application of the two methods, supporting each other, increases the security of identification. For better reproducibility and faster analysis, the SCAR markers derived from the RAPD results provide a new method for quick authentication of Cordyceps.

  18. Ancient DNA and morphometric analysis reveal extinction and replacement of New Zealand's unique black swans.

    Science.gov (United States)

    Rawlence, Nicolas J; Kardamaki, Afroditi; Easton, Luke J; Tennyson, Alan J D; Scofield, R Paul; Waters, Jonathan M

    2017-07-26

    Prehistoric human impacts on megafaunal populations have dramatically reshaped ecosystems worldwide. However, the effects of human exploitation on smaller species, such as anatids (ducks, geese, and swans) are less clear. In this study we apply ancient DNA and osteological approaches to reassess the history of Australasia's iconic black swans ( Cygnus atratus ) including the palaeo-behaviour of prehistoric populations. Our study shows that at the time of human colonization, New Zealand housed a genetically, morphologically, and potentially ecologically distinct swan lineage ( C. sumnerensis , Poūwa), divergent from modern (Australian) C. atratus Morphological analyses indicate C. sumnerensis exhibited classic signs of the 'island rule' effect, being larger, and likely flight-reduced compared to C. atratus Our research reveals sudden extinction and replacement events within this anatid species complex, coinciding with recent human colonization of New Zealand. This research highlights the role of anthropogenic processes in rapidly reshaping island ecosystems and raises new questions for avian conservation, ecosystem re-wilding, and de-extinction. © 2017 The Author(s).

  19. Use of pollen and ancient DNA as conservation baselines for offshore islands in New Zealand.

    Science.gov (United States)

    Wilmshurst, Janet M; Moar, Neville T; Wood, Jamie R; Bellingham, Peter J; Findlater, Amy M; Robinson, James J; Stone, Clive

    2014-02-01

    Islands play a key role globally in the conservation of endemic species. Many island reserves have been highly modified since human colonization, and their restoration and management usually occur without knowledge of their prehuman state. However, conservation paleoecology is increasingly being recognized as a tool that can help to inform both restoration and conservation of island reserves by providing prehuman vegetation baselines. Many of New Zealand's mammal-free offshore islands are foci for biological diversity conservation and, like many islands in the Polynesian region, were deforested following initial human settlement. Therefore, their current restoration, replanting, and management are guided either by historic vegetation descriptions or the occurrence of species on forested islands. We analyzed pollen and ancient DNA in soil cores from an offshore island in northern New Zealand. The result was a 2000-year record of vegetation change that began >1200 years before human settlement and spanned 550 years of human occupation and 180 years of forest succession since human occupation ceased. Between prehuman and contemporary forests there was nearly a complete species turnover including the extirpation of a dominant conifer and a palm tree. The podocarp-dominated forests were replaced by a native but novel angiosperm-dominated forest. There is no modern analog of the prehuman forests on any northern New Zealand island, and those islands that are forested are dominated by angiosperms which are assumed to be climax forests. The pollen and DNA evidence for conifer- and palm-rich forests in the prehuman era challenge this climax forest assumption. Prehuman vegetation records can thus help to inform future restoration of degraded offshore islands by informing the likely rate and direction of successional change; helping to determine whether natural rates of succession are preferable to more costly replanting programs; and providing past species lists if

  20. Investigating kinship of Neolithic post-LBK human remains from Krusza Zamkowa, Poland using ancient DNA.

    Science.gov (United States)

    Juras, Anna; Chyleński, Maciej; Krenz-Niedbała, Marta; Malmström, Helena; Ehler, Edvard; Pospieszny, Łukasz; Łukasik, Sylwia; Bednarczyk, Józef; Piontek, Janusz; Jakobsson, Mattias; Dabert, Miroslawa

    2017-01-01

    We applied an interdisciplinary approach to investigate kinship patterns and funerary practices during the middle Neolithic. Genetic studies, radiocarbon dating, and taphonomic analyses were used to examine two grave clusters from Krusza Zamkowa, Poland. To reconstruct kinship and determine biological sex, we extracted DNA from bones and teeth, analyzed mitochondrial genomes and nuclear SNPs using the HID-Ion AmpliSeq™ Identity panel generated on Illumina and Ion Torrent platforms, respectively. We further dated the material (AMS 14 C) and to exclude aquatic radiocarbon reservoir effects, measures of carbon and nitrogen stable isotopes for diet reconstruction were used. We found distinct mitochondrial genomes belonging to haplogroups U5b2a1a, K1c and H3d in the first grave cluster, and excluded maternal kin patterns among the three analyzed individuals. In the second grave cluster one individual belonged to K1a4. However, we could not affiliate the second individual to a certain haplogroup due to the fragmented state of the mitochondrial genome. Although the individuals from the second grave cluster differ at position 6643, we believe that more data is needed to fully resolve this issue. We retrieved between 26 and 77 autosomal SNPs from three of the individuals. Based on kinship estimations, taking into account the allelic dropout distribution, we could not exclude first degree kin relation between the two individuals from the second grave cluster. We could, however, exclude a first degree kinship between these two individuals and an individual from the first grave cluster. Presumably, not only biological kinship, but also social relations played an important role in the funerary practice during this time period. We further conclude that the HID-Ion AmpliSeq™ Identity Panel may prove useful for first degree kin relation studies for samples with good DNA preservation, and that mitochondrial genome capture enrichment is a powerful tool for excluding direct

  1. DNA typing of ancient parasite eggs from environmental samples identifies human and animal worm infections in viking-age settlement

    DEFF Research Database (Denmark)

    Søe, Martin Jensen; Nejsum, Peter; Fredensborg, Brian Lund

    2015-01-01

    selecting genetic markers, PCR amplification and sequencing of ancient DNA (aDNA) isolates resulted in identification of: the human whipworm, Trichuris trichiura, using SSUrRNA sequence homology; Ascaris sp. with 100% homology to cox1 haplotype 07; and Fasciola hepatica using ITS1 sequence homology......Ancient parasite eggs were recovered from environmental samples collected at a Viking-age settlement in Viborg, Denmark, dated 1018-1030 A.D. Morphological examination identified Ascaris sp., Trichuris sp., and Fasciola sp. eggs, but size and shape did not allow species identification. By carefully....... The identification of T. trichiura eggs indicates that human fecal material is present and, hence, that the Ascaris sp. haplotype 07 was most likely a human variant in Viking-age Denmark. The location of the F. hepatica finding suggests that sheep or cattle are the most likely hosts. Further, we sequenced...

  2. Pulling out the 1%: Whole-Genome Capture for the Targeted Enrichment of Ancient DNA Sequencing Libraries

    Science.gov (United States)

    Carpenter, Meredith L.; Buenrostro, Jason D.; Valdiosera, Cristina; Schroeder, Hannes; Allentoft, Morten E.; Sikora, Martin; Rasmussen, Morten; Gravel, Simon; Guillén, Sonia; Nekhrizov, Georgi; Leshtakov, Krasimir; Dimitrova, Diana; Theodossiev, Nikola; Pettener, Davide; Luiselli, Donata; Sandoval, Karla; Moreno-Estrada, Andrés; Li, Yingrui; Wang, Jun; Gilbert, M. Thomas P.; Willerslev, Eske; Greenleaf, William J.; Bustamante, Carlos D.

    2013-01-01

    Most ancient specimens contain very low levels of endogenous DNA, precluding the shotgun sequencing of many interesting samples because of cost. Ancient DNA (aDNA) libraries often contain DNA, with the majority of sequencing capacity taken up by environmental DNA. Here we present a capture-based method for enriching the endogenous component of aDNA sequencing libraries. By using biotinylated RNA baits transcribed from genomic DNA libraries, we are able to capture DNA fragments from across the human genome. We demonstrate this method on libraries created from four Iron Age and Bronze Age human teeth from Bulgaria, as well as bone samples from seven Peruvian mummies and a Bronze Age hair sample from Denmark. Prior to capture, shotgun sequencing of these libraries yielded an average of 1.2% of reads mapping to the human genome (including duplicates). After capture, this fraction increased substantially, with up to 59% of reads mapped to human and enrichment ranging from 6- to 159-fold. Furthermore, we maintained coverage of the majority of regions sequenced in the precapture library. Intersection with the 1000 Genomes Project reference panel yielded an average of 50,723 SNPs (range 3,062–147,243) for the postcapture libraries sequenced with 1 million reads, compared with 13,280 SNPs (range 217–73,266) for the precapture libraries, increasing resolution in population genetic analyses. Our whole-genome capture approach makes it less costly to sequence aDNA from specimens containing very low levels of endogenous DNA, enabling the analysis of larger numbers of samples. PMID:24568772

  3. DNA barcode authentication of wood samples of threatened and commercial timber trees within the tropical dry evergreen forest of India.

    Science.gov (United States)

    Nithaniyal, Stalin; Newmaster, Steven G; Ragupathy, Subramanyam; Krishnamoorthy, Devanathan; Vassou, Sophie Lorraine; Parani, Madasamy

    2014-01-01

    India is rich with biodiversity, which includes a large number of endemic, rare and threatened plant species. Previous studies have used DNA barcoding to inventory species for applications in biodiversity monitoring, conservation impact assessment, monitoring of illegal trading, authentication of traded medicinal plants etc. This is the first tropical dry evergreen forest (TDEF) barcode study in the World and the first attempt to assemble a reference barcode library for the trees of India as part of a larger project initiated by this research group. We sampled 429 trees representing 143 tropical dry evergreen forest (TDEF) species, which included 16 threatened species. DNA barcoding was completed using rbcL and matK markers. The tiered approach (1st tier rbcL; 2nd tier matK) correctly identified 136 out of 143 species (95%). This high level of species resolution was largely due to the fact that the tree species were taxonomically diverse in the TDEF. Ability to resolve taxonomically diverse tree species of TDEF was comparable among the best match method, the phylogenetic method, and the characteristic attribute organization system method. We demonstrated the utility of the TDEF reference barcode library to authenticate wood samples from timber operations in the TDEF. This pilot research study will enable more comprehensive surveys of the illegal timber trade of threatened species in the TDEF. This TDEF reference barcode library also contains trees that have medicinal properties, which could be used to monitor unsustainable and indiscriminate collection of plants from the wild for their medicinal value.

  4. Authentic leadership to the future

    Directory of Open Access Journals (Sweden)

    Dimovski Vlado

    2012-01-01

    Full Text Available Authentic leadership is the latest evolutionary stage in leadership development and emphasizes the leader's authenticity. The construct of authenticity was researched by ancient Greek philosophers as 'know thy-self ', and 'thy true self '. Authentic leadership began to develop after 2004. The main reason why the researchers place so much attention to authentic leadership is fact that authentic leadership reaches all of the employees in organizations. Authentic leaders must identify the strengths of their followers and help them with their development and integration towards a common goal, purpose, vision and identity of the organization. Authentic leadership is seen as the final stage in the development of leadership styles, properties of this leadership style, and the consequences of this style have not been fully explored. In our paper we will explore this new style of leadership and its implications.

  5. Non-invasive ancient DNA protocol for fluid-preserved specimens and phylogenetic systematics of the genus Orestias (Teleostei: Cyprinodontidae).

    Science.gov (United States)

    Garrigos, Yareli Esquer; Hugueny, Bernard; Koerner, Kellie; Ibañez, Carla; Bonillo, Celine; Pruvost, Patrice; Causse, Romain; Cruaud, Corinne; Gaubert, Philippe

    2013-01-01

    Specimens stored in museum collections represent a crucial source of morphological and genetic information, notably for taxonomically problematic groups and extinct taxa. Although fluid-preserved specimens of groups such as teleosts may constitute an almost infinite source of DNA, few ancient DNA protocols have been applied to such material. In this study, we describe a non-invasive Guanidine-based (GuSCN) ancient DNA extraction protocol adapted to fluid-preserved specimens that we use to re-assess the systematics of the genus Orestias (Cyprinodontidae: Teleostei). The latter regroups pupfishes endemic to the inter-Andean basin that have been considered as a 'species flock', and for which the morphology-based taxonomic delimitations have been hotly debated. We extracted DNA from the type specimens of Orestias kept at the Muséum National d'Histoire Naturelle of Paris, France, including the extinct species O. cuvieri. We then built the first molecular (control region [CR] and rhodopsin [RH]) phylogeny including historical and recently collected representatives of all the Orestias complexes as recognized by Parenti (1984a): agassizii, cuvieri, gilsoni and mulleri. Our ancient DNA extraction protocol was validated after PCR amplification through an approach based on fragment-by-fragment chimera detection. After optimization, we were able to amplify Titicaca. We could not recover the reciprocal monophyly of any of the 15 species or morphotypes that were considered in our analyses, possibly due to incomplete lineage sorting and/or hybridization events. As a consequence, our results starkly question the delineation of a series of diagnostic characters listed in the literature for Orestias. Although not included in our phylogenetic analysis, the syntype of O. jussiei could not be assigned to the agassizii complex as newly defined. The CR sequence of the extinct O. cuvieri was recovered within the cuvieri clade (same haplotype as one representative of O. pentlandii), so

  6. Ancient mitochondrial DNA and the genetic history of Eurasian beaver (Castor fiber) in Europe.

    Science.gov (United States)

    Horn, Susanne; Prost, Stefan; Stiller, Mathias; Makowiecki, Daniel; Kuznetsova, Tatiana; Benecke, Norbert; Pucher, Erich; Hufthammer, Anne K; Schouwenburg, Charles; Shapiro, Beth; Hofreiter, Michael

    2014-04-01

    After centuries of human hunting, the Eurasian beaver Castor fiber had disappeared from most of its original range by the end of the 19th century. The surviving relict populations are characterized by both low genetic diversity and strong phylogeographical structure. However, it remains unclear whether these attributes are the result of a human-induced, late Holocene bottleneck or already existed prior to this reduction in range. To investigate genetic diversity in Eurasian beaver populations during the Holocene, we obtained mitochondrial control region DNA sequences from 48 ancient beaver samples and added 152 modern sequences from GenBank. Phylogeographical analyses of the data indicate a differentiation of European beaver populations into three mitochondrial clades. The two main clades occur in western and eastern Europe, respectively, with an early Holocene contact zone in eastern Europe near a present-day contact zone. A divergent and previously unknown clade of beavers from the Danube Basin survived until at least 6000 years ago, but went extinct during the transition to modern times. Finally, we identify a recent decline in effective population size of Eurasian beavers, with a stronger bottleneck signal in the western than in the eastern clade. Our results suggest that the low genetic diversity and the strong phylogeographical structure in recent beavers are artefacts of human hunting-associated population reductions. While beaver populations have been growing rapidly since the late 19th century, genetic diversity within modern beaver populations remains considerably reduced compared to what was present prior to the period of human hunting and habitat reduction.

  7. Ancient DNA from European Early Neolithic Farmers Reveals Their Near Eastern Affinities

    Science.gov (United States)

    Haak, Wolfgang; Balanovsky, Oleg; Sanchez, Juan J.; Koshel, Sergey; Zaporozhchenko, Valery; Adler, Christina J.; Der Sarkissian, Clio S. I.; Brandt, Guido; Schwarz, Carolin; Nicklisch, Nicole; Dresely, Veit; Fritsch, Barbara; Balanovska, Elena; Villems, Richard; Meller, Harald; Alt, Kurt W.; Cooper, Alan

    2010-01-01

    In Europe, the Neolithic transition (8,000–4,000 b.c.) from hunting and gathering to agricultural communities was one of the most important demographic events since the initial peopling of Europe by anatomically modern humans in the Upper Paleolithic (40,000 b.c.). However, the nature and speed of this transition is a matter of continuing scientific debate in archaeology, anthropology, and human population genetics. To date, inferences about the genetic make up of past populations have mostly been drawn from studies of modern-day Eurasian populations, but increasingly ancient DNA studies offer a direct view of the genetic past. We genetically characterized a population of the earliest farming culture in Central Europe, the Linear Pottery Culture (LBK; 5,500–4,900 calibrated b.c.) and used comprehensive phylogeographic and population genetic analyses to locate its origins within the broader Eurasian region, and to trace potential dispersal routes into Europe. We cloned and sequenced the mitochondrial hypervariable segment I and designed two powerful SNP multiplex PCR systems to generate new mitochondrial and Y-chromosomal data from 21 individuals from a complete LBK graveyard at Derenburg Meerenstieg II in Germany. These results considerably extend the available genetic dataset for the LBK (n = 42) and permit the first detailed genetic analysis of the earliest Neolithic culture in Central Europe (5,500–4,900 calibrated b.c.). We characterized the Neolithic mitochondrial DNA sequence diversity and geographical affinities of the early farmers using a large database of extant Western Eurasian populations (n = 23,394) and a wide range of population genetic analyses including shared haplotype analyses, principal component analyses, multidimensional scaling, geographic mapping of genetic distances, and Bayesian Serial Simcoal analyses. The results reveal that the LBK population shared an affinity with the modern-day Near East and Anatolia, supporting a major

  8. Ancient DNA analyses of museum specimens from selected Presbytis (primate: Colobinae) based on partial Cyt b sequences

    Science.gov (United States)

    Aifat, N. R.; Yaakop, S.; Md-Zain, B. M.

    2016-11-01

    The IUCN Red List of Threatened Species has categorized Malaysian primates from being data deficient to critically endanger. Thus, ancient DNA analyses hold great potential to understand phylogeny, phylogeography and population history of extinct and extant species. Museum samples are one of the alternatives to provide important sources of biological materials for a large proportion of ancient DNA studies. In this study, a total of six museum skin samples from species Presbytis hosei (4 samples) and Presbytis frontata (2 samples), aged between 43 and 124 years old were extracted to obtain the DNA. Extraction was done by using QIAGEN QIAamp DNA Investigator Kit and the ability of this kit to extract museum skin samples was tested by amplification of partial Cyt b sequence using species-specific designed primer. Two primer pairs were designed specifically for P. hosei and P. frontata, respectively. These primer pairs proved to be efficient in amplifying 200bp of the targeted species in the optimized PCR conditions. The performance of the sequences were tested to determine genetic distance of genus Presbytis in Malaysia. From the analyses, P. hosei is closely related to P. chrysomelas and P. frontata with the value of 0.095 and 0.106, respectively. Cyt b gave a clear data in determining relationships among Bornean species. Thus, with the optimized condition, museum specimens can be used for molecular systematic studies of the Malaysian primates.

  9. Comparative authentication of Hypericum perforatum herbal products using DNA metabarcoding, TLC and HPLC-MS.

    Science.gov (United States)

    Raclariu, Ancuta Cristina; Paltinean, Ramona; Vlase, Laurian; Labarre, Aurélie; Manzanilla, Vincent; Ichim, Mihael Cristin; Crisan, Gianina; Brysting, Anne Krag; de Boer, Hugo

    2017-05-02

    Many herbal products have a long history of use, but there are increasing concerns over product efficacy, safety and quality in the wake of recent cases exposing discrepancies between labeling and constituents. When it comes to St. John's wort (Hypericum perforatum L.) herbal products, there is limited oversight, frequent off-label use and insufficient monitoring of adverse drug reactions. In this study, we use amplicon metabarcoding (AMB) to authenticate 78 H. perforatum herbal products and evaluate its ability to detect substitution compared to standard methods using thin-layer chromatography (TLC) and high performance liquid chromatography coupled with mass spectrometry (HPLC-MS). Hypericum perforatum was detected in 68% of the products using AMB. Furthermore, AMB detected incongruence between constituent species and those listed on the label in all products. Neither TLC nor HPLC-MS could be used to unambiguously identify H. perforatum. They are accurate methods for authenticating presence of the target compounds, but have limited efficiency in detecting infrageneric substitution and do not yield any information on other plant ingredients in the products. Random post-marketing AMB of herbal products by regulatory agencies could raise awareness among consumers of substitution and would provide an incentive to manufacturers to increase quality control from raw ingredients to commercialized products.

  10. Ancient DNA analysis of Indigenous rockfish use on the Pacific Coast: Implications for marine conservation areas and fisheries management.

    Directory of Open Access Journals (Sweden)

    Antonia T Rodrigues

    Full Text Available Rockfish (Sebastes spp. are a common marine fish in nearshore and continental shelf environments in the North Pacific Ocean. They are frequently identified in coastal archaeological sites in western North America; however, the morphological similarity of rockfish species limits conventional zooarchaeological identifications to the genus level. This study applies ancient DNA analysis to 96 archaeological rockfish specimens from four sites on separate islands in an archipelago on western Vancouver Island, British Columbia, Canada. Two of the archaeological sites are located within a marine protected area specifically designed to facilitate the recovery of inshore rockfish populations; two sites are located outside this boundary and remain subject to considerable fishing pressure. Using mitochondrial 16S and control region DNA sequences, we identify at least twelve different rockfish species utilized during the past 2,500 years. Identification of rockfish at closely spaced and contemporaneously occupied sites confirms that a variety of Sebastes species were consistently exploited at each site, with more exposed areas having a higher number of species present. Identification results indicate that four of the twelve species did not occur within the conservation area boundary and, instead, were found in sites where commercial and recreational fishing continues to be permitted. This study demonstrates that ancient DNA identifications of archaeological assemblages can complement and expand perspective on modern day fisheries conservation and management in this National Park Reserve and First Nations ancestral territory.

  11. Ancient DNA analysis of Indigenous rockfish use on the Pacific Coast: Implications for marine conservation areas and fisheries management.

    Science.gov (United States)

    Rodrigues, Antonia T; McKechnie, Iain; Yang, Dongya Y

    2018-01-01

    Rockfish (Sebastes spp.) are a common marine fish in nearshore and continental shelf environments in the North Pacific Ocean. They are frequently identified in coastal archaeological sites in western North America; however, the morphological similarity of rockfish species limits conventional zooarchaeological identifications to the genus level. This study applies ancient DNA analysis to 96 archaeological rockfish specimens from four sites on separate islands in an archipelago on western Vancouver Island, British Columbia, Canada. Two of the archaeological sites are located within a marine protected area specifically designed to facilitate the recovery of inshore rockfish populations; two sites are located outside this boundary and remain subject to considerable fishing pressure. Using mitochondrial 16S and control region DNA sequences, we identify at least twelve different rockfish species utilized during the past 2,500 years. Identification of rockfish at closely spaced and contemporaneously occupied sites confirms that a variety of Sebastes species were consistently exploited at each site, with more exposed areas having a higher number of species present. Identification results indicate that four of the twelve species did not occur within the conservation area boundary and, instead, were found in sites where commercial and recreational fishing continues to be permitted. This study demonstrates that ancient DNA identifications of archaeological assemblages can complement and expand perspective on modern day fisheries conservation and management in this National Park Reserve and First Nations ancestral territory.

  12. Ancient DNA analyses exclude humans as the driving force behind late Pleistocene musk ox (Ovibos moschatus) population dynamics

    DEFF Research Database (Denmark)

    Campos, Paula; Willerslev, Eske; Sher, Andrei

    2010-01-01

    , as it was the geographic origin of all samples studied and held a large diverse population until local extinction at approximately 45,000 radiocarbon years before present ((14)C YBP). Subsequently, musk ox genetic diversity reincreased at ca. 30,000 (14)C YBP, recontracted at ca. 18,000 (14)C YBP, and finally recovered...... to the present. The musk ox has an intermediate story: relatively abundant during the Pleistocene, it is now restricted to Greenland and the Arctic Archipelago. In this study, we use ancient DNA sequences, temporally unbiased summary statistics, and Bayesian analytical techniques to infer musk ox population...

  13. A minimally-invasive method for sampling human petrous bones from the cranial base for ancient DNA analysis.

    Science.gov (United States)

    Sirak, Kendra A; Fernandes, Daniel M; Cheronet, Olivia; Novak, Mario; Gamarra, Beatriz; Balassa, Tímea; Bernert, Zsolt; Cséki, Andrea; Dani, János; Gallina, József Zsolt; Kocsis-Buruzs, Gábor; Kővári, Ivett; László, Orsolya; Pap, Ildikó; Patay, Róbert; Petkes, Zsolt; Szenthe, Gergely; Szeniczey, Tamás; Hajdu, Tamás; Pinhasi, Ron

    2017-06-01

    Ancient DNA (aDNA) research involves invasive and destructive sampling procedures that are often incompatible with anthropological, anatomical, and bioarcheological analyses requiring intact skeletal remains. The osseous labyrinth inside the petrous bone has been shown to yield higher amounts of endogenous DNA than any other skeletal element; however, accessing this labyrinth in cases of a complete or reconstructed skull involves causing major structural damage to the cranial vault or base. Here, we describe a novel cranial base drilling method (CBDM) for accessing the osseous labyrinth from the cranial base that prevents damaging the surrounding cranial features, making it highly complementary to morphological analyses. We assessed this method by comparing the aDNA results from one petrous bone processed using our novel method to its pair, which was processed using established protocols for sampling disarticulated petrous bones. We show a decrease in endogenous DNA and molecular copy numbers when the drilling method is used; however, we also show that this method produces more endogenous DNA and higher copy numbers than any postcranial bone. Our results demonstrate that this minimally-invasive method reduces the loss of genetic data associated with the use of other skeletal elements and enables the combined craniometric and genetic study of individuals with archeological, cultural, and evolutionary value.

  14. Application of Ancient DNA Methods to the Study of the Transatlantic Slave Trade

    DEFF Research Database (Denmark)

    Sandoval Velasco, Marcela

    extractions, sequencing library preparations, and whole-genome capture enrichment methods, with the goal of retrieving ancient genome wide data from poorly preserved archaeological remains. Such data contributes to the study of the transatlantic slave trade, in particular helping shed light upon the origins...... of retrieving ancient genome wide data from poorly preserved archaeological remains. Such data contributes to the study of the transatlantic slave trade, in particular helping shed light upon the origins and diversity of enslaved Africans. Ultimately this will help answer long-standing historical questions...

  15. Genetic diversity loss in a biodiversity hotspot: ancient DNA quantifies genetic decline and former connectivity in a critically endangered marsupial.

    Science.gov (United States)

    Pacioni, Carlo; Hunt, Helen; Allentoft, Morten E; Vaughan, Timothy G; Wayne, Adrian F; Baynes, Alexander; Haouchar, Dalal; Dortch, Joe; Bunce, Michael

    2015-12-01

    The extent of genetic diversity loss and former connectivity between fragmented populations are often unknown factors when studying endangered species. While genetic techniques are commonly applied in extant populations to assess temporal and spatial demographic changes, it is no substitute for directly measuring past diversity using ancient DNA (aDNA). We analysed both mitochondrial DNA (mtDNA) and nuclear microsatellite loci from 64 historical fossil and skin samples of the critically endangered Western Australian woylie (Bettongia penicillata ogilbyi), and compared them with 231 (n = 152 for mtDNA) modern samples. In modern woylie populations 15 mitochondrial control region (CR) haplotypes were identified. Interestingly, mtDNA CR data from only 29 historical samples demonstrated 15 previously unknown haplotypes and detected an extinct divergent clade. Through modelling, we estimated the loss of CR mtDNA diversity to be between 46% and 91% and estimated this to have occurred in the past 2000-4000 years in association with a dramatic population decline. In addition, we obtained near-complete 11-loci microsatellite profiles from 21 historical samples. In agreement with the mtDNA data, a number of 'new' microsatellite alleles was only detected in the historical populations despite extensive modern sampling, indicating a nuclear genetic diversity loss >20%. Calculations of genetic diversity (heterozygosity and allelic rarefaction) showed that these were significantly higher in the past and that there was a high degree of gene flow across the woylie's historical range. These findings have an immediate impact on how the extant populations are managed and we recommend the implementation of an assisted migration programme to prevent further loss of genetic diversity. Our study demonstrates the value of integrating aDNA data into current-day conservation strategies. © 2015 John Wiley & Sons Ltd.

  16. Practical application of DNA markers for high-throughput authentication of Panax ginseng and Panax quinquefolius from commercial ginseng products

    Directory of Open Access Journals (Sweden)

    Juyeon Jung

    2014-04-01

    Full Text Available Korean ginseng (Panax ginseng and American ginseng (Panax quinquefolius are widely used medicinal plants with similar morphology but different medicinal efficacy. Roots, flowers, and processed products of Korean and American ginseng can be difficult to differentiate from each other, leading to illegal trade in which one species is sold as the other. This study was carried out to develop convenient and reliable chloroplast genome-derived DNA markers for authentication of Korean and American ginseng in commercial processed products. One codominant marker could reproducibly identify both species and intentional mixtures of the two species. We further developed a set of species-unique dominant DNA markers. Each species-specific dominant marker could detect 1% cross contamination with other species by low resolution agarose gel electrophoresis or quantitative polymerase chain reaction. Both markers were successfully applied to evaluate the original species from various processed ginseng products purchased from markets in Korea and China. We believe that high-throughput application of this marker system will eradicate illegal trade and promote confident marketing for both species to increase the value of Korean as well as American ginseng in Korea and worldwide.

  17. DNA barcoding approaches for fishing authentication of exploited grouper species including the endangered and legally protected goliath grouper Epinephelus itajara

    Directory of Open Access Journals (Sweden)

    Rodrigo A. Torres

    2013-09-01

    Full Text Available Fishing strategies are constantly changing to meet the needs for new or alternative food sources. Consequently, management of fishing activities regarding rates of exploitation is essential, as a number of resources have reached situations of overexploitation. The aim of the present study was to use DNA barcoding from the goliath grouper and other exploited epinephelids in order to provide procedures for DNA authentication to be used as evidence for combating putative illegal fishing. The species studied were Epinephelus adscensionis, Mycteroperca bonaci, Mycteroperca interstitialis, Epinephelus itajara, Mycteroperca venenosa, Epinephelus mystacinus, Dermatolepis inermis, Alphestes afer, Cephalopholis fulva, Mycteroperca acutirostris, Rypticus saponaceus, Mycteroperca marginata and Epinephelus morio. Four of these species are the main epinephelids fished in the Atlantic Ocean. Differential patterns of polymerase chain reaction–restriction fragment length polymorphism were obtained from the species and additional single nucleotide polymorphisms were also detected among the four main epinephelids studied. The procedures proved very efficient and we suggest their applicability to the other fish groups as a way to control illegal capture and retail around the world, especially in cases in which filleting and other forms of de-characterization cause a lack of morpho-anatomical key characters.

  18. Low Mitochondrial DNA Diversity in an Ancient Population from China: Insight into Social Organization at the Fujia Site.

    Science.gov (United States)

    Dong, Yu; Li, Chunxiang; Luan, Fengshi; Li, Zhenguang; Li, Hongjie; Cui, Yinqiu; Zhou, Hui; Malhi, Ripan S

    2015-01-01

    To gain insight into the social organization of a population associated with the Dawenkou period, we performed ancient DNA analysis of 18 individuals from human remains from the Fujia site in Shandong Province, China. Directly radiocarbon dated to 4800-4500 cal BP, the Fujia site is assumed to be associated with a transitional phase from matrilineal clans to patrilineal monogamous families. Our results reveal a low mitochondrial DNA diversity from the site and population. Combined with Y chromosome data, the pattern observed at the Fujia site is most consistent with a matrilineal community. The patterns also suggest that the bond of marriage was de-emphasized compared with the bonds of descent at Fujia.

  19. Ancient DNA from Giant Panda (Ailuropoda melanoleuca of South-Western China Reveals Genetic Diversity Loss during the Holocene

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    Gui-Lian Sheng

    2018-04-01

    Full Text Available The giant panda was widely distributed in China and south-eastern Asia during the middle to late Pleistocene, prior to its habitat becoming rapidly reduced in the Holocene. While conservation reserves have been established and population numbers of the giant panda have recently increased, the interpretation of its genetic diversity remains controversial. Previous analyses, surprisingly, have indicated relatively high levels of genetic diversity raising issues concerning the efficiency and usefulness of reintroducing individuals from captive populations. However, due to a lack of DNA data from fossil specimens, it is unknown whether genetic diversity was even higher prior to the most recent population decline. We amplified complete cytb and 12s rRNA, partial 16s rRNA and ND1, and control region sequences from the mitochondrial genomes of two Holocene panda specimens. We estimated genetic diversity and population demography by analyzing the ancient mitochondrial DNA sequences alongside those from modern giant pandas, as well as from other members of the bear family (Ursidae. Phylogenetic analyses show that one of the ancient haplotypes is sister to all sampled modern pandas and the second ancient individual is nested among the modern haplotypes, suggesting that genetic diversity may indeed have been higher earlier during the Holocene. Bayesian skyline plot analysis supports this view and indicates a slight decline in female effective population size starting around 6000 years B.P., followed by a recovery around 2000 years ago. Therefore, while the genetic diversity of the giant panda has been affected by recent habitat contraction, it still harbors substantial genetic diversity. Moreover, while its still low population numbers require continued conservation efforts, there seem to be no immediate threats from the perspective of genetic evolutionary potential.

  20. Ancient DNA from Giant Panda (Ailuropoda melanoleuca) of South-Western China Reveals Genetic Diversity Loss during the Holocene.

    Science.gov (United States)

    Sheng, Gui-Lian; Barlow, Axel; Cooper, Alan; Hou, Xin-Dong; Ji, Xue-Ping; Jablonski, Nina G; Zhong, Bo-Jian; Liu, Hong; Flynn, Lawrence J; Yuan, Jun-Xia; Wang, Li-Rui; Basler, Nikolas; Westbury, Michael V; Hofreiter, Michael; Lai, Xu-Long

    2018-04-06

    The giant panda was widely distributed in China and south-eastern Asia during the middle to late Pleistocene, prior to its habitat becoming rapidly reduced in the Holocene. While conservation reserves have been established and population numbers of the giant panda have recently increased, the interpretation of its genetic diversity remains controversial. Previous analyses, surprisingly, have indicated relatively high levels of genetic diversity raising issues concerning the efficiency and usefulness of reintroducing individuals from captive populations. However, due to a lack of DNA data from fossil specimens, it is unknown whether genetic diversity was even higher prior to the most recent population decline. We amplified complete cyt b and 12s rRNA, partial 16s rRNA and ND1 , and control region sequences from the mitochondrial genomes of two Holocene panda specimens. We estimated genetic diversity and population demography by analyzing the ancient mitochondrial DNA sequences alongside those from modern giant pandas, as well as from other members of the bear family (Ursidae). Phylogenetic analyses show that one of the ancient haplotypes is sister to all sampled modern pandas and the second ancient individual is nested among the modern haplotypes, suggesting that genetic diversity may indeed have been higher earlier during the Holocene. Bayesian skyline plot analysis supports this view and indicates a slight decline in female effective population size starting around 6000 years B.P., followed by a recovery around 2000 years ago. Therefore, while the genetic diversity of the giant panda has been affected by recent habitat contraction, it still harbors substantial genetic diversity. Moreover, while its still low population numbers require continued conservation efforts, there seem to be no immediate threats from the perspective of genetic evolutionary potential.

  1. Ancient DNA analyses reveal contrasting phylogeographic patterns amongst kiwi (Apteryx spp. and a recently extinct lineage of spotted kiwi.

    Directory of Open Access Journals (Sweden)

    Lara D Shepherd

    Full Text Available The little spotted kiwi (Apteryx owenii is a flightless ratite formerly found throughout New Zealand but now greatly reduced in distribution. Previous phylogeographic studies of the related brown kiwi (A. mantelli, A. rowi and A. australis, with which little spotted kiwi was once sympatric, revealed extremely high levels of genetic structuring, with mitochondrial DNA haplotypes often restricted to populations. We surveyed genetic variation throughout the present and pre-human range of little spotted kiwi by obtaining mitochondrial DNA sequences from contemporary and ancient samples. Little spotted kiwi and great spotted kiwi (A. haastii formed a monophyletic clade sister to brown kiwi. Ancient samples of little spotted kiwi from the northern North Island, where it is now extinct, formed a lineage that was distinct from remaining little spotted kiwi and great spotted kiwi lineages, potentially indicating unrecognized taxonomic diversity. Overall, little spotted kiwi exhibited much lower levels of genetic diversity and structuring than brown kiwi, particularly through the South Island. Our results also indicate that little spotted kiwi (or at least hybrids involving this species survived on the South Island mainland until more recently than previously thought.

  2. Mitochondrial DNA and Y-chromosomal diversity in ancient populations of domestic sheep (Ovis aries) in Finland: comparison with contemporary sheep breeds.

    Science.gov (United States)

    Niemi, Marianna; Bläuer, Auli; Iso-Touru, Terhi; Nyström, Veronica; Harjula, Janne; Taavitsainen, Jussi-Pekka; Storå, Jan; Lidén, Kerstin; Kantanen, Juha

    2013-01-22

    Several molecular and population genetic studies have focused on the native sheep breeds of Finland. In this work, we investigated their ancestral sheep populations from Iron Age, Medieval and Post-Medieval periods by sequencing a partial mitochondrial DNA D-loop and the 5'-promoter region of the SRY gene. We compared the maternal (mitochondrial DNA haplotypes) and paternal (SNP oY1) genetic diversity of ancient sheep in Finland with modern domestic sheep populations in Europe and Asia to study temporal changes in genetic variation and affinities between ancient and modern populations. A 523-bp mitochondrial DNA sequence was successfully amplified for 26 of 36 sheep ancient samples i.e. five, seven and 14 samples representative of Iron Age, Medieval and Post-Medieval sheep, respectively. Genetic diversity was analyzed within the cohorts. This ancient dataset was compared with present-day data consisting of 94 animals from 10 contemporary European breeds and with GenBank DNA sequence data to carry out a haplotype sharing analysis. Among the 18 ancient mitochondrial DNA haplotypes identified, 14 were present in the modern breeds. Ancient haplotypes were assigned to the highly divergent ovine haplogroups A and B, haplogroup B being the major lineage within the cohorts. Only two haplotypes were detected in the Iron Age samples, while the genetic diversity of the Medieval and Post-Medieval cohorts was higher. For three of the ancient DNA samples, Y-chromosome SRY gene sequences were amplified indicating that they originated from rams. The SRY gene of these three ancient ram samples contained SNP G-oY1, which is frequent in modern north-European sheep breeds. Our study did not reveal any sign of major population replacement of native sheep in Finland since the Iron Age. Variations in the availability of archaeological remains may explain differences in genetic diversity estimates and patterns within the cohorts rather than demographic events that occurred in the past

  3. Differential Nuclear and Mitochondrial DNA Preservation in Post-Mortem Teeth with Implications for Forensic and Ancient DNA Studies

    Science.gov (United States)

    Higgins, Denice; Rohrlach, Adam B.; Kaidonis, John; Townsend, Grant; Austin, Jeremy J.

    2015-01-01

    Major advances in genetic analysis of skeletal remains have been made over the last decade, primarily due to improvements in post-DNA-extraction techniques. Despite this, a key challenge for DNA analysis of skeletal remains is the limited yield of DNA recovered from these poorly preserved samples. Enhanced DNA recovery by improved sampling and extraction techniques would allow further advancements. However, little is known about the post-mortem kinetics of DNA degradation and whether the rate of degradation varies between nuclear and mitochondrial DNA or across different skeletal tissues. This knowledge, along with information regarding ante-mortem DNA distribution within skeletal elements, would inform sampling protocols facilitating development of improved extraction processes. Here we present a combined genetic and histological examination of DNA content and rates of DNA degradation in the different tooth tissues of 150 human molars over short-medium post-mortem intervals. DNA was extracted from coronal dentine, root dentine, cementum and pulp of 114 teeth via a silica column method and the remaining 36 teeth were examined histologically. Real time quantification assays based on two nuclear DNA fragments (67 bp and 156 bp) and one mitochondrial DNA fragment (77 bp) showed nuclear and mitochondrial DNA degraded exponentially, but at different rates, depending on post-mortem interval and soil temperature. In contrast to previous studies, we identified differential survival of nuclear and mtDNA in different tooth tissues. Futhermore histological examination showed pulp and dentine were rapidly affected by loss of structural integrity, and pulp was completely destroyed in a relatively short time period. Conversely, cementum showed little structural change over the same time period. Finally, we confirm that targeted sampling of cementum from teeth buried for up to 16 months can provide a reliable source of nuclear DNA for STR-based genotyping using standard

  4. DNA fingerprinting: a quality control case study for human biospecimen authentication.

    Science.gov (United States)

    Kofanova, Olga A; Mathieson, William; Thomas, Gerry A; Betsou, Fotini

    2014-04-01

    This case study illustrates the usefulness of the DNA fingerprinting method in biobank quality control (QC) procedures and emphasizes the need for detailed and accurate record keeping during processing of biological samples. It also underlines the value of independent third-party assessment to identify points at which errors are most likely to have occurred when unexpected results are obtained from biospecimens.

  5. Ancient DNA reveals traces of Iberian Neolithic and Bronze Age lineages in modern Iberian horses

    DEFF Research Database (Denmark)

    Lira, Jaime; Linderholm, Anna; Olaria, Carmen

    2010-01-01

    Multiple geographical regions have been proposed for the domestication of Equus caballus. It has been suggested, based on zooarchaeological and genetic analyses that wild horses from the Iberian Peninsula were involved in the process, and the overrepresentation of mitochondrial D1 cluster in modern....... Neolithic and Bronze Age sequences grouped in other clusters, one of which (Lusitano group C) is exclusively represented by modern horses of Iberian origin. Moreover, Bronze Age Iberian sequences displayed the lowest nucleotide diversity values when compared with modern horses, ancient wild horses and other...... ancient domesticates using nonparametric bootstrapping analyses. We conclude that the excessive clustering of Bronze Age horses in the Lusitano group C, the observed nucleotide diversity and the local continuity from wild Neolithic Iberian to modern Iberian horses, could be explained by the use of local...

  6. Fungal palaeodiversity revealed using high-throughput metabarcoding of ancient DNA from arctic permafrost

    DEFF Research Database (Denmark)

    Bellemain, Eva; Davey, Marie L.; Kauserud, Håvard

    2013-01-01

    and endophytes) typical of graminoid- and forb-rich habitats. We also detected putative insect pathogens, coprophiles and keratinophiles likely associated with ancient insect and herbivore faunas. The detection of putative insect pathogens, mycoparasites, aquatic fungi and endophytes broadens our previous...... knowledge of the diversity of fungi present in Beringian palaeoecosystems. A large group of putatively psychrophilic/psychrotolerant fungi was also detected, most likely representing a modern, metabolically active fungal community....

  7. Ancient DNA reveals substantial genetic diversity in the California Condor (Gymnogyps californianus) prior to a population bottleneck

    Science.gov (United States)

    D'Elia, Jesse; Haig, Susan M.; Mullins, Thomas D.; Miller, Mark P.

    2016-01-01

    Critically endangered species that have undergone severe population bottlenecks often have little remaining genetic variation, making it difficult to reconstruct population histories to apply in reintroduction and recovery strategies. By using ancient DNA techniques, it is possible to combine genetic evidence from the historical population with contemporary samples to provide a more complete picture of a species' genetic variation across its historical range and through time. Applying this approach, we examined changes in the mitochondrial DNA (mtDNA) control region (526 base pairs) of the endangered California Condor (Gymnogyps californianus). Results showed a >80% reduction in unique haplotypes over the past 2 centuries. We found no spatial sorting of haplotypes in the historical population; the periphery of the range contained haplotypes that were common throughout the historical range. Direct examination of mtDNA from California Condor museum specimens provided a new window into historical population connectivity and genetic diversity showing: (1) a substantial loss of haplotypes, which is consistent with the hypothesis that condors were relatively abundant in the nineteenth century, but declined rapidly as a result of human-caused mortality; and (2) no evidence of historical population segregation, meaning that the available genetic data offer no cause to avoid releasing condors in unoccupied portions of their historical range.

  8. Pre-Columbian population dynamics in coastal southern Peru: A diachronic investigation of mtDNA patterns in the Palpa region by ancient DNA analysis.

    Science.gov (United States)

    Fehren-Schmitz, Lars; Reindel, Markus; Cagigao, Elsa Tomasto; Hummel, Susanne; Herrmann, Bernd

    2010-02-01

    Alternative models have been proposed to explain the formation and decline of the south Peruvian Nasca culture, ranging from migration or invasion to autochthonous development and ecological crisis. To reveal to what extent population dynamic processes accounted for cultural development in the Nasca mainland, or were influenced by them, we analyzed ancient mitochondrial DNA of 218 individuals, originating from chronologically successive archaeological sites in the Palpa region, the Paracas Peninsula, and the Andean highlands in southern Peru. The sampling strategy allowed a diachronic analysis in a time frame from approximately 800 BC to 800 AD. Mitochondrial coding region polymorphisms were successfully analyzed and replicated for 130 individuals and control region sequences (np 16021-16408) for 104 individuals to determine Native American mitochondrial DNA haplogroups and haplotypes. The results were compared with ancient and contemporary Peruvian populations to reveal genetic relations of the archaeological samples. Frequency data and statistics show clear proximity of the Nasca populations to the populations of the preceding Paracas culture from Palpa and the Peninsula, and suggest, along with archaeological data, that the Nasca culture developed autochthonously in the Rio Grande drainage. Furthermore, the influence of changes in socioeconomic complexity in the Palpa area on the genetic diversity of the local population could be observed. In all, a strong genetic affinity between pre-Columbian coastal populations from southern Peru could be determined, together with a significant differentiation from ancient highland and all present-day Peruvian reference populations, best shown in the differential distribution of mitochondrial haplogroups. 2009 Wiley-Liss, Inc.

  9. Genotyping of Capreolus pygargus fossil DNA from Denisova cave reveals phylogenetic relationships between ancient and modern populations.

    Directory of Open Access Journals (Sweden)

    Nadezhda V Vorobieva

    Full Text Available BACKGROUND: The extant roe deer (Capreolus Gray, 1821 includes two species: the European roe deer (C. capreolus and the Siberian roe deer (C. pygargus that are distinguished by morphological and karyotypical differences. The Siberian roe deer occupies a vast area of Asia and is considerably less studied than the European roe deer. Modern systematics of the Siberian roe deer remain controversial with 4 morphological subspecies. Roe deer fossilized bones are quite abundant in Denisova cave (Altai Mountains, South Siberia, where dozens of both extant and extinct mammalian species from modern Holocene to Middle Pleistocene have been retrieved. METHODOLOGY/PRINCIPAL FINDINGS: We analyzed a 629 bp fragment of the mitochondrial control region from ancient bones of 10 Holocene and four Pleistocene Siberian roe deer from Denisova cave as well as 37 modern specimen belonging to populations from Altai, Tian Shan (Kyrgyzstan, Yakutia, Novosibirsk region and the Russian Far East. Genealogical reconstructions indicated that most Holocene haplotypes were probably ancestral for modern roe deer populations of Western Siberia and Tian Shan. One of the Pleistocene haplotypes was possibly ancestral for modern Yakutian populations, and two extinct Pleistocene haplotypes were close to modern roe deer from Tian Shan and Yakutia. Most modern geographical populations (except for West Siberian Plains are heterogeneous and there is some tentative evidence for structure. However, we did not find any distinct phylogenetic signal characterizing particular subspecies in either modern or ancient samples. CONCLUSION/SIGNIFICANCE: Analysis of mitochondrial DNA from both ancient and modern samples of Siberian roe deer shed new light on understanding the evolutionary history of roe deer. Our data indicate that during the last 50,000 years multiple replacements of populations of the Siberian roe deer took place in the Altai Mountains correlating with climatic changes. The Siberian

  10. Genotyping of Capreolus pygargus Fossil DNA from Denisova Cave Reveals Phylogenetic Relationships between Ancient and Modern Populations

    Science.gov (United States)

    Vorobieva, Nadezhda V.; Sherbakov, Dmitry Y.; Druzhkova, Anna S.; Stanyon, Roscoe; Tsybankov, Alexander A.; Vasil'ev, Sergey K.; Shunkov, Mikhail V.; Trifonov, Vladimir A.; Graphodatsky, Alexander S.

    2011-01-01

    Background The extant roe deer (Capreolus Gray, 1821) includes two species: the European roe deer (C. capreolus) and the Siberian roe deer (C. pygargus) that are distinguished by morphological and karyotypical differences. The Siberian roe deer occupies a vast area of Asia and is considerably less studied than the European roe deer. Modern systematics of the Siberian roe deer remain controversial with 4 morphological subspecies. Roe deer fossilized bones are quite abundant in Denisova cave (Altai Mountains, South Siberia), where dozens of both extant and extinct mammalian species from modern Holocene to Middle Pleistocene have been retrieved. Methodology/Principal Findings We analyzed a 629 bp fragment of the mitochondrial control region from ancient bones of 10 Holocene and four Pleistocene Siberian roe deer from Denisova cave as well as 37 modern specimen belonging to populations from Altai, Tian Shan (Kyrgyzstan), Yakutia, Novosibirsk region and the Russian Far East. Genealogical reconstructions indicated that most Holocene haplotypes were probably ancestral for modern roe deer populations of Western Siberia and Tian Shan. One of the Pleistocene haplotypes was possibly ancestral for modern Yakutian populations, and two extinct Pleistocene haplotypes were close to modern roe deer from Tian Shan and Yakutia. Most modern geographical populations (except for West Siberian Plains) are heterogeneous and there is some tentative evidence for structure. However, we did not find any distinct phylogenetic signal characterizing particular subspecies in either modern or ancient samples. Conclusion/Significance Analysis of mitochondrial DNA from both ancient and modern samples of Siberian roe deer shed new light on understanding the evolutionary history of roe deer. Our data indicate that during the last 50,000 years multiple replacements of populations of the Siberian roe deer took place in the Altai Mountains correlating with climatic changes. The Siberian roe deer

  11. Ancient DNA Analysis Suggests Negligible Impact of the Wari Empire Expansion in Peru's Central Coast during the Middle Horizon.

    Directory of Open Access Journals (Sweden)

    Guido Valverde

    Full Text Available The analysis of ancient human DNA from South America allows the exploration of pre-Columbian population history through time and to directly test hypotheses about cultural and demographic evolution. The Middle Horizon (650-1100 AD represents a major transitional period in the Central Andes, which is associated with the development and expansion of ancient Andean empires such as Wari and Tiwanaku. These empires facilitated a series of interregional interactions and socio-political changes, which likely played an important role in shaping the region's demographic and cultural profiles. We analyzed individuals from three successive pre-Columbian cultures present at the Huaca Pucllana archaeological site in Lima, Peru: Lima (Early Intermediate Period, 500-700 AD, Wari (Middle Horizon, 800-1000 AD and Ychsma (Late Intermediate Period, 1000-1450 AD. We sequenced 34 complete mitochondrial genomes to investigate the potential genetic impact of the Wari Empire in the Central Coast of Peru. The results indicate that genetic diversity shifted only slightly through time, ruling out a complete population discontinuity or replacement driven by the Wari imperialist hegemony, at least in the region around present-day Lima. However, we caution that the very subtle genetic contribution of Wari imperialism at the particular Huaca Pucllana archaeological site might not be representative for the entire Wari territory in the Peruvian Central Coast.

  12. Ancient DNA analysis of the oldest canid species from the Siberian Arctic and genetic contribution to the domestic dog.

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    Esther J Lee

    Full Text Available Modern Arctic Siberia provides a wealth of resources for archaeological, geological, and paleontological research to investigate the population dynamics of faunal communities from the Pleistocene, particularly as the faunal material coming from permafrost has proven suitable for genetic studies. In order to examine the history of the Canid species in the Siberian Arctic, we carried out genetic analysis of fourteen canid remains from various sites, including the well-documented Upper Paleolithic Yana RHS and Early Holocene Zhokhov Island sites. Estimated age of samples range from as recent as 1,700 years before present (YBP to at least 360,000 YBP for the remains of the extinct wolf, Canis cf. variabilis. In order to examine the genetic affinities of ancient Siberian canids species to the domestic dog and modern wolves, we obtained mitochondrial DNA control region sequences and compared them to published ancient and modern canid sequences. The older canid specimens illustrate affinities with pre-domestic dog/wolf lineages while others appear in the major phylogenetic clades of domestic dogs. Our results suggest a European origin of domestic dog may not be conclusive and illustrates an emerging complexity of genetic contribution of regional wolf breeds to the modern Canis gene pool.

  13. The last Viking King: a royal maternity case solved by ancient DNA analysis

    DEFF Research Database (Denmark)

    Dissing, Jørgen; Binladen, Jonas; Hansen, Anders

    2006-01-01

    doubts among historians whether the woman entombed was indeed Estrid. To shed light on this problem, we have extracted and analysed mitochondrial DNA (mtDNA) from pulp of teeth from each of the two royals. Four overlapping DNA-fragments covering about 400bp of hypervariable region 1 (HVR-1) of the D...... Estridsen to haplogroup H; Estrid's sequence differed from that of Sven at two positions in HVR-1, 16093T-->C and 16304T-->C, indicating that she belongs to subgroup H5a. Given the maternal inheritance of mtDNA, offspring will have the same mtDNA sequence as their mother with the exception of rare cases...

  14. The effect of ancient DNA damage on inferences of demographic histories

    DEFF Research Database (Denmark)

    Axelsson, Erik; Willerslev, Eske; Gilbert, Marcus Thomas Pius

    2008-01-01

    of diversity. In this paper, we examine the effect of DNA damage on population genetic estimates of ancestral population size. We simulate data using standard coalescent simulations that include postmortem damage and show that estimates of effective population sizes are inflated around, or right after......, the sampling time of the ancestral DNA sequences. This bias leads to estimates of increasing, and then decreasing, population sizes, as observed in several recently published studies. We reanalyze a recently published data set of DNA sequences from the Bison (Bison bison/Bison priscus) and show that the signal...

  15. nrDNA ITS sequence based SCAR marker to authenticate Aconitum heterophyllum and Cyperus rotundus in Ayurvedic raw drug source and prepared herbal products.

    Science.gov (United States)

    Seethapathy, Gopalakrishnan Saroja; Balasubramani, Subramani Paranthaman; Venkatasubramanian, Padma

    2014-02-15

    To authenticate Ayurvedic medicinal plants Ativisha (Aconitum heterophyllum) and Musta (Cyperus rotundus) at the raw drug source and in prepared herbal products, nrDNA ITS sequence based SCAR markers were designed and validated spp.-specific SCAR primers gave amplicon of 415 bp and 134 bp, respectively, in authentic species. The SCAR primers (Cyr-FP and Cyr-RP) could identify tissue sample containing 750 μg to 4.76 mg/100mg of Musta in complex mixtures of DNA extracted from commercial herbal drugs. Ativisha could not be identified through SCAR markers suggesting that authentic species may not been used to prepare herbal drugs despite its being labelled as one of the ingredients in formulations. Analysis of individual tubers of Ativisha and Musta assures the presence of admixtures in raw drug trade of Ativisha, indicates the need to monitor the basic raw material supply and concludes, supplying plant materials through cultivation to manufacturing industries can minimize the risks of adulteration. Copyright © 2013 Elsevier Ltd. All rights reserved.

  16. Towards the onset of fruit tree growing north of the Alps: ancient DNA from waterlogged apple (Malus sp.) seed fragments.

    Science.gov (United States)

    Schlumbaum, Angela; van Glabeke, Sabine; Roldan-Ruiz, Isabel

    2012-01-20

    Wild apples (Malus sp.) have been a major food source in the northern Alpine region since prehistory and their use is well understood. The onset of deliberate fruit tree growing in the area is, however, less clear. It is generally assumed that horticulture was practised in Roman times, but it might be even earlier. In the archaeological record seed testa and pericarp remains are particularly frequent at sites with waterlogged preservation such as lakeshore settlements or wells, pits and ditches, but the distinction between wild and domestic plants is not morphologically possible. With waterlogged remains being one main source of information about past fruit cultivation, we have tested the feasibility of analysing ancient DNA from waterlogged preserved bulk samples of testa fragments. We studied apple seeds from three Neolithic and three Roman sites with waterlogged preservation in the Alpine foreland. Chloroplast markers failed in all samples, but nuclear ITS1 (internal transcribed spacer region 1) of the ribosomal DNA was successfully typed in two Roman samples from the site Oedenburg/Biesheim-Kunheim (Haut-Rhin, F). The retrieved ITS1 sequences are identical to each other and are shared with wild Malus sylvestris and Malus sieversii, and with domestic apple cultivars, supporting the potential of using waterlogged remains for identifying the genetic status of apple diachronically. Copyright © 2011 Elsevier GmbH. All rights reserved.

  17. Whole genome amplification and microsatellite genotyping of herbarium DNA revealed the identity of an ancient grapevine cultivar

    Science.gov (United States)

    Malenica, Nenad; Šimon, Silvio; Besendorfer, Višnja; Maletić, Edi; Karoglan Kontić, Jasminka; Pejić, Ivan

    2011-09-01

    Reconstruction of the grapevine cultivation history has advanced tremendously during the last decade. Identification of grapevine cultivars by using microsatellite DNA markers has mostly become a routine. The parentage of several renowned grapevine cultivars, like Cabernet Sauvignon and Chardonnay, has been elucidated. However, the assembly of a complete grapevine genealogy is not yet possible because missing links might no longer be in cultivation or are even extinct. This problem could be overcome by analyzing ancient DNA from grapevine herbarium specimens and other historical remnants of once cultivated varieties. Here, we present the first successful genotyping of a grapevine herbarium specimen and the identification of the corresponding grapevine cultivar. Using a set of nine grapevine microsatellite markers, in combination with a whole genome amplification procedure, we found the 90-year-old Tribidrag herbarium specimen to display the same microsatellite profile as the popular American cultivar Zinfandel. This work, together with information from several historical documents, provides a new clue of Zinfandel cultivation in Croatia as early as the beginning of fifteenth century, under the native name Tribidrag. Moreover, it emphasizes substantial information potential of existing grapevine and other herbarium collections worldwide.

  18. DNA barcoding for species identification from dried and powdered plant parts: a case study with authentication of the raw drug market samples of Sida cordifolia.

    Science.gov (United States)

    Vassou, Sophie Lorraine; Kusuma, G; Parani, Madasamy

    2015-03-15

    The majority of the plant materials used in herbal medicine is procured from the markets in the form of dried or powdered plant parts. It is essential to use authentic plant materials to derive the benefits of herbal medicine. However, establishing the identity of these plant materials by conventional taxonomy is extremely difficult. Here we report a case study in which the species identification of the market samples of Sida cordifolia was done by DNA barcoding. As a prelude to species identification by DNA barcoding, 13 species of Sida were collected, and a reference DNA barcode library was developed using rbcL, matK, psbA-trnH and ITS2 markers. Based on the intra-species and inter-species divergence observed, psbA-trnH and ITS2 were found to be the best two-marker combination for species identification of the market samples. The study showed that none of the market samples belonged to the authentic species, S. cordifolia. Seventy-six per cent of the market samples belonged to other species of Sida. The predominant one was Sida acuta (36%) followed by S. spinosa (20%), S. alnifolia (12%), S. scabrida (4%) and S. ravii (4%). Such substitutions may not only fail to give the expected therapeutic effect, but may also give undesirable effects as in case of S. acuta which contains a 6-fold higher amount of ephedrine compared to the roots of S. cordifolia. The remaining 24% of the samples were from other genera such as Abutilon sp. (8%), Ixonanthes sp., Terminalia sp., Fagonia sp., and Tephrosia sp. (4% each). This observation is in contrast to the belief that medicinal plants are generally substituted or adulterated with closely related species. The current study strongly suggests that the raw drug market samples of herbal medicines need to be properly authenticated before use, and DNA barcoding has been found to be suitable for this purpose. Copyright © 2015 Elsevier B.V. All rights reserved.

  19. DNA barcoding of authentic and substitute samples of herb of the family Asparagaceae and Asclepiadaceae based on the ITS2 region

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    Padmalatha S Rai

    2012-01-01

    Full Text Available Background : Herbal drugs used to treat illness according to Ayurveda are often misidentified or adulterated with similar plant materials. Objective: To aid taxonomical identification, we used DNA barcoding to evaluate authentic and substitute samples of herb and phylogenetic relationship of four medicinal plants of family Asparagaceace and Asclepiadaceae. Materials and Methods : DNA extracted from dry root samples of two authentic and two substitutes of four specimens belonging to four species were subjected to polymerase chain reaction (PCR and DNA sequencing. Primers for nuclear DNA (nu ITS2 and plastid DNA (matK and rpoC1 were used for PCR and sequence analysis was performed by Clustal W. The intraspecific variation and interspecific divergence were calculated using MEGA V 4.0. Statistical Analysis : Kimura′s two parameter model, neighbor joining and bootstrapping methods were used in this work. Results: The result indicates the efficiency of amplification for ITS2 candidate DNA barcodes was 100% for four species tested. The average interspecific divergence is 0.12 and intraspecific variation was 0.232 in the case of two Asparagaceae species. In two Asclepiadaceae species, average interspecific divergence and intraspecific variation were 0.178 and 0.004 respectively. Conclusions: Our findings show that the ITS2 region can effectively discriminate Asparagus racemosus and Hemidesmus indicus from its substitute samples and hence can resolve species admixtures in raw samples. The ITS2 region may be used as one of the standard DNA barcodes to identify closely related species of family Asclepiadaceae but was noninformative for Asparagaceae species suggesting a need for the development of new markers for each family. More detailed studies involving more species and substitutes are warranted.

  20. Ancient mitochondrial DNA from the northern fringe of the Neolithic farming expansion in Europe sheds light on the dispersion process.

    Science.gov (United States)

    Malmström, Helena; Linderholm, Anna; Skoglund, Pontus; Storå, Jan; Sjödin, Per; Gilbert, M Thomas P; Holmlund, Gunilla; Willerslev, Eske; Jakobsson, Mattias; Lidén, Kerstin; Götherström, Anders

    2015-01-19

    The European Neolithization process started around 12 000 years ago in the Near East. The introduction of agriculture spread north and west throughout Europe and a key question has been if this was brought about by migrating individuals, by an exchange of ideas or a by a mixture of these. The earliest farming evidence in Scandinavia is found within the Funnel Beaker Culture complex (Trichterbecherkultur, TRB) which represents the northernmost extension of Neolithic farmers in Europe. The TRB coexisted for almost a millennium with hunter-gatherers of the Pitted Ware Cultural complex (PWC). If migration was a substantial part of the Neolithization, even the northerly TRB community would display a closer genetic affinity to other farmer populations than to hunter-gatherer populations. We deep-sequenced the mitochondrial hypervariable region 1 from seven farmers (six TRB and one Battle Axe complex, BAC) and 13 hunter-gatherers (PWC) and authenticated the sequences using postmortem DNA damage patterns. A comparison with 124 previously published sequences from prehistoric Europe shows that the TRB individuals share a close affinity to Central European farmer populations, and that they are distinct from hunter-gatherer groups, including the geographically close and partially contemporary PWC that show a close affinity to the European Mesolithic hunter-gatherers. © 2014 The Author(s) Published by the Royal Society. All rights reserved.

  1. New flexible origination technology based on electron-beam lithography and its integration into security devices in combination with covert features based on DNA authentication

    Science.gov (United States)

    Drinkwater, John K.; Ryzi, Zbynek; Outwater, Chris S.

    2002-04-01

    Embossed diffractive optically variable devices are becoming increasingly familiar security items on plastic cards, banknotes, security documents and on branded goods and media to protect against counterfeit, protect copyright and to evidence tamper. Equally as this devices become both more widely available there is a pressing requirement for security technology upgrades to keep ahead of technology advances available to potential counterfeiters. This paper describes a new generation electron beam DOVID origination technology particularly suitable for high security applications. Covert marking of security devices is provided using the DNA matrix by creating and verifying unique DNA sequences. This integration of this into practical security features in combination with covert features based on DNA matrix authentication and other more straightforwardly authenticable features to provide multi- technology security solutions will be described.

  2. Detection of 400-year-old Yersinia pestis DNA in human dental pulp: an approach to the diagnosis of ancient septicemia.

    Science.gov (United States)

    Drancourt, M; Aboudharam, G; Signoli, M; Dutour, O; Raoult, D

    1998-10-13

    Ancient septicemic plague epidemics were reported to have killed millions of people for 2 millenniums. However, confident diagnosis of ancient septicemia solely on the basis of historical clinical observations is not possible. The lack of suitable infected material has prevented direct demonstration of ancient septicemia; thus, the history of most infections such as plague remains hypothetical. The durability of dental pulp, together with its natural sterility, makes it a suitable material on which to base such research. We hypothesized that it would be a lasting refuge for Yersinia pestis, the plague agent. DNA extracts were made from the dental pulp of 12 unerupted teeth extracted from skeletons excavated from 16th and 18th century French graves of persons thought to have died of plague ("plague teeth") and from 7 ancient negative control teeth. PCRs incorporating ancient DNA extracts and primers specific for the human beta-globin gene demonstrated the absence of inhibitors in these preparations. The incorporation of primers specific for Y. pestis rpoB (the RNA polymerase beta-subunit-encoding gene) and the recognized virulence-associated pla (the plasminogen activator-encoding gene) repeatedly yielded products that had a nucleotide sequence indistinguishable from that of modern day isolates of the bacterium. The specific pla sequence was obtained from 6 of 12 plague skeleton teeth but 0 of 7 negative controls (P plague was achieved for historically identified victims, and we have confirmed the presence of the disease at the end of 16th century in France. Dental pulp is an attractive target in the quest to determine the etiology of septicemic illnesses detected in ancient corpses. Molecular techniques could be applied to this material to resolve historical outbreaks.

  3. Recent advances in ancient DNA research and their implications for archaeobotany

    DEFF Research Database (Denmark)

    Brown, Terence A.; Cappellini, Enrico; Kistler, Logan

    2015-01-01

    with archaeobotanical explants, not just with charred grain but with most if not all species likely to be encountered in an archaeobotanical setting. Distinctions between different subspecies groups such as cereal landraces will also be possible in the near future. Phenotypic characterization, in which aDNA sequencing...... is used to infer the biological characteristics of an archaeological specimen, will become possible, improving our understanding of traits such as flowering behaviour of cereals, and when combined with studies of preserved RNA and protein will enable complex phenotypes such as environmental tolerance...

  4. First ancient DNA sequences from the Late Pleistocene red deer (Cervus elaphus) in the Crimea, Ukraine

    Science.gov (United States)

    Stanković, Ana; Nadachowski, Adam; Doan, Karolina; Stefaniak, Krzysztof; Baca, Mateusz; Socha, Paweł; Wegleński, Piotr; Ridush, Bogdan

    2010-05-01

    The Late Pleistocene has been a period of significant population and species turnover and extinctions among the large mammal fauna. Massive climatic and environmental changes during Pleistocene significantly influenced the distribution and also genetic diversity of plants and animals. The model of glacial refugia and habitat contraction to southern peninsulas in Europe as areas for the survival of temperate animal species during unfavourable Pleistocene glaciations is at present widely accepted. However, both molecular data and the fossil record indicate the presence of northern and perhaps north-eastern refugia in Europe. In recent years, much new palaeontological data have been obtained in the Crimean Peninsula, Ukraine, following extensive investigations. The red deer (Cervus elaphus) samples for aDNA studies were collected in Emine-Bair-Khosar Cave, situated on the north edge of Lower Plateau of the Chatyrdag Massif (Crimean Mountains). The cave is a vertical shaft, which functioned as a huge mega-trap over a long period of time (probably most of the Pleistocene). The bone assemblages provided about 5000 bones belonging to more than 40 species. The C. elaphus bones were collected from three different stratigraphical levels, radiocarbon dated by accelerator mass spectrometry (AMS) method. The bone fragments of four specimens of red deer were used for the DNA isolation and analysis. The mtDNA (Cytochome b) was successfully isolated from three bone fragments and the cytochrome b sequences were amplified by multiplex PCR. The sequences obtained so far allowed for the reconstruction of only preliminary phylogenetic trees. A fragment of metatarsus from level dated to ca. 48,500±2,000 years BP, yielded a sequence of 513 bp, allowing to locate the specimen on the phylogenetic tree within modern C. elaphus specimens from southern and middle Europe. The second bone fragment, a fragment of mandible, collected from level dated approximately to ca. 33,500±400 years BP

  5. Ancient DNA analysis reveals high frequency of European lactase persistence allele (T-13910) in medieval central europe.

    Science.gov (United States)

    Krüttli, Annina; Bouwman, Abigail; Akgül, Gülfirde; Della Casa, Philippe; Rühli, Frank; Warinner, Christina

    2014-01-01

    Ruminant milk and dairy products are important food resources in many European, African, and Middle Eastern societies. These regions are also associated with derived genetic variants for lactase persistence. In mammals, lactase, the enzyme that hydrolyzes the milk sugar lactose, is normally down-regulated after weaning, but at least five human populations around the world have independently evolved mutations regulating the expression of the lactase-phlorizin-hydrolase gene. These mutations result in a dominant lactase persistence phenotype and continued lactase tolerance in adulthood. A single nucleotide polymorphism (SNP) at C/T-13910 is responsible for most lactase persistence in European populations, but when and where the T-13910 polymorphism originated and the evolutionary processes by which it rose to high frequency in Europe have been the subject of strong debate. A history of dairying is presumed to be a prerequisite, but archaeological evidence is lacking. In this study, DNA was extracted from the dentine of 36 individuals excavated at a medieval cemetery in Dalheim, Germany. Eighteen individuals were successfully genotyped for the C/T-13910 SNP by molecular cloning and sequencing, of which 13 (72%) exhibited a European lactase persistence genotype: 44% CT, 28% TT. Previous ancient DNA-based studies found that lactase persistence genotypes fall below detection levels in most regions of Neolithic Europe. Our research shows that by AD 1200, lactase persistence frequency had risen to over 70% in this community in western Central Europe. Given that lactase persistence genotype frequency in present-day Germany and Austria is estimated at 71-80%, our results suggest that genetic lactase persistence likely reached modern levels before the historic population declines associated with the Black Death, thus excluding plague-associated evolutionary forces in the rise of lactase persistence in this region. This new evidence sheds light on the dynamic evolutionary

  6. Ancient DNA analysis reveals high frequency of European lactase persistence allele (T-13910 in medieval central europe.

    Directory of Open Access Journals (Sweden)

    Annina Krüttli

    Full Text Available Ruminant milk and dairy products are important food resources in many European, African, and Middle Eastern societies. These regions are also associated with derived genetic variants for lactase persistence. In mammals, lactase, the enzyme that hydrolyzes the milk sugar lactose, is normally down-regulated after weaning, but at least five human populations around the world have independently evolved mutations regulating the expression of the lactase-phlorizin-hydrolase gene. These mutations result in a dominant lactase persistence phenotype and continued lactase tolerance in adulthood. A single nucleotide polymorphism (SNP at C/T-13910 is responsible for most lactase persistence in European populations, but when and where the T-13910 polymorphism originated and the evolutionary processes by which it rose to high frequency in Europe have been the subject of strong debate. A history of dairying is presumed to be a prerequisite, but archaeological evidence is lacking. In this study, DNA was extracted from the dentine of 36 individuals excavated at a medieval cemetery in Dalheim, Germany. Eighteen individuals were successfully genotyped for the C/T-13910 SNP by molecular cloning and sequencing, of which 13 (72% exhibited a European lactase persistence genotype: 44% CT, 28% TT. Previous ancient DNA-based studies found that lactase persistence genotypes fall below detection levels in most regions of Neolithic Europe. Our research shows that by AD 1200, lactase persistence frequency had risen to over 70% in this community in western Central Europe. Given that lactase persistence genotype frequency in present-day Germany and Austria is estimated at 71-80%, our results suggest that genetic lactase persistence likely reached modern levels before the historic population declines associated with the Black Death, thus excluding plague-associated evolutionary forces in the rise of lactase persistence in this region. This new evidence sheds light on the dynamic

  7. Molecular dating of caprines using ancient DNA sequences of Myotragus balearicus, an extinct endemic Balearic mammal

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    Alcover Josep Antoni

    2005-12-01

    Full Text Available Abstract Background Myotragus balearicus was an endemic bovid from the Balearic Islands (Western Mediterranean that became extinct around 6,000-4,000 years ago. The Myotragus evolutionary lineage became isolated in the islands most probably at the end of the Messinian crisis, when the desiccation of the Mediterranean ended, in a geological date established at 5.35 Mya. Thus, the sequences of Myotragus could be very valuable for calibrating the mammalian mitochondrial DNA clock and, in particular, the tree of the Caprinae subfamily, to which Myotragus belongs. Results We have retrieved the complete mitochondrial cytochrome b gene (1,143 base pairs, plus fragments of the mitochondrial 12S gene and the nuclear 28S rDNA multi-copy gene from a well preserved Myotragus subfossil bone. The best resolved phylogenetic trees, obtained with the cytochrome b gene, placed Myotragus in a position basal to the Ovis group. Using the calibration provided by the isolation of Balearic Islands, we calculated that the initial radiation of caprines can be dated at 6.2 ± 0.4 Mya. In addition, alpine and southern chamois, considered until recently the same species, split around 1.6 ± 0.3 Mya, indicating that the two chamois species have been separated much longer than previously thought. Conclusion Since there are almost no extant endemic mammals in Mediterranean islands, the sequence of the extinct Balearic endemic Myotragus has been crucial for allowing us to use the Messinian crisis calibration point for dating the caprines phylogenetic tree.

  8. Cheek Tooth Morphology and Ancient Mitochondrial DNA of Late Pleistocene Horses from the Western Interior of North America: Implications for the Taxonomy of North American Late Pleistocene Equus

    OpenAIRE

    Barron-Ortiz, Christina; Rodrigues, Antonia; Theodor, Jessica; Kooyman, Brian; Yang, Dongya; Speller, Camilla Filomena

    2017-01-01

    Horses were a dominant component of North American Pleistocene land mammal communities and their remains are well represented in the fossil record. Despite the abundant material available for study, there is still considerable disagreement over the number of species of Equus that inhabited the different regions of the continent and on their taxonomic nomenclature. In this study, we investigated cheek tooth morphology and ancient mtDNA of late Pleistocene Equus specimens from the Western Inter...

  9. Ancient DNA from 8400 Year-Old Çatalhöyük Wheat: Implications for the Origin of Neolithic Agriculture.

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    Hatice Bilgic

    Full Text Available Human history was transformed with the advent of agriculture in the Fertile Crescent with wheat as one of the founding crops. Although the Fertile Crescent is renowned as the center of wheat domestication, archaeological studies have shown the crucial involvement of Çatalhöyük in this process. This site first gained attention during the 1961-65 excavations due to the recovery of primitive hexaploid wheat. However, despite the seeds being well preserved, a detailed archaeobotanical description of the samples is missing. In this article, we report on the DNA isolation, amplification and sequencing of ancient DNA of charred wheat grains from Çatalhöyük and other Turkish archaeological sites and the comparison of these wheat grains with contemporary wheat species including T. monococcum, T. dicoccum, T. dicoccoides, T. durum and T. aestivum at HMW glutenin protein loci. These ancient samples represent the oldest wheat sample sequenced to date and the first ancient wheat sample from the Middle East. Remarkably, the sequence analysis of the short DNA fragments preserved in seeds that are approximately 8400 years old showed that the Çatalhöyük wheat stock contained hexaploid wheat, which is similar to contemporary hexaploid wheat species including both naked (T. aestivum and hulled (T. spelta wheat. This suggests an early transitory state of hexaploid wheat agriculture from the Fertile Crescent towards Europe spanning present-day Turkey.

  10. Subspecific Status of the Korean Tiger Inferred by Ancient DNA Analysis

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    Mu-Yeong Lee

    2012-01-01

    Full Text Available The tiger population that once inhabited the Korean peninsula was initially considered a unique subspecies (Panthera tigris coreensis, distinct from the Amur tiger of the Russian Far East (P. t. altaica. However, in the following decades, the population of P. t. coreensis was classified as P. t. altaica and hence forth the two populations have been considered the same subspecies. From an ecological point of view, the classification of the Korean tiger population as P. t. altaica is a plausible conclusion. Historically, there were no major dispersal barriers between the Korean peninsula and the habitat of Amur tigers in Far Eastern Russia and northeastern China that might prevent gene flow, especially for a large carnivore with long-distance dispersal abilities. However, there has yet to be a genetic study to confirm the subspecific status of the Korean tiger. Bone samples from four tigers originally caught in the Korean peninsula were collected from two museums in Japan and the United States. Eight mitochondrial gene fragments were sequenced and compared to previously published tiger subspecies’ mtDNA sequences to assess the phylogenetic relationship of the Korean tiger. Three individuals shared an identical haplotype with the Amur tigers. One specimen grouped with Malayan tigers, perhaps due to misidentification or mislabeling of the sample. Our results support the conclusion that the Korean tiger should be classified as P. t. altaica, which has important implications for the conservation and reintroduction of Korean tigers.

  11. Assessment of the extirpated Maritimes walrus using morphological and ancient DNA analysis.

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    Brenna A McLeod

    Full Text Available Species biogeography is a result of complex events and factors associated with climate change, ecological interactions, anthropogenic impacts, physical geography, and evolution. To understand the contemporary biogeography of a species, it is necessary to understand its history. Specimens from areas of localized extinction are important, as extirpation of species from these areas may represent the loss of unique adaptations and a distinctive evolutionary trajectory. The walrus (Odobenus rosmarus has a discontinuous circumpolar distribution in the arctic and subarctic that once included the southeastern Canadian Maritimes region. However, exploitation of the Maritimes population during the 16th-18th centuries led to extirpation, and the species has not inhabited areas south of 55°N for ∼250 years. We examined genetic and morphological characteristics of specimens from the Maritimes, Atlantic (O. r. rosmarus and Pacific (O. r. divergens populations to test the hypothesis that the first group was distinctive. Analysis of Atlantic and Maritimes specimens indicated that most skull and mandibular measurements were significantly different between the Maritimes and Atlantic groups and discriminant analysis of principal components confirmed them as distinctive groups, with complete isolation of skull features. The Maritimes walrus appear to have been larger animals, with larger and more robust tusks, skulls and mandibles. The mtDNA control region haplotypes identified in Maritimes specimens were unique to the region and a greater average number of nucleotide differences were found between the regions (Atlantic and Maritimes than within either group. Levels of diversity (h and π were lower in the Maritimes, consistent with other studies of species at range margins. Our data suggest that the Maritimes walrus was a morphologically and genetically distinctive group that was on a different evolutionary path from other walrus found in the north Atlantic.

  12. Geospatial Authentication

    Science.gov (United States)

    Lyle, Stacey D.

    2009-01-01

    A software package that has been designed to allow authentication for determining if the rover(s) is/are within a set of boundaries or a specific area to access critical geospatial information by using GPS signal structures as a means to authenticate mobile devices into a network wirelessly and in real-time has been developed. The advantage lies in that the system only allows those with designated geospatial boundaries or areas into the server. The Geospatial Authentication software has two parts Server and Client. The server software is a virtual private network (VPN) developed in Linux operating system using Perl programming language. The server can be a stand-alone VPN server or can be combined with other applications and services. The client software is a GUI Windows CE software, or Mobile Graphical Software, that allows users to authenticate into a network. The purpose of the client software is to pass the needed satellite information to the server for authentication.

  13. Ancient DNA Analysis of 8000 B.C. Near Eastern Farmers Supports an Early Neolithic Pioneer Maritime Colonization of Mainland Europe through Cyprus and the Aegean Islands

    Science.gov (United States)

    Fernández, Eva; Pérez-Pérez, Alejandro; Gamba, Cristina; Prats, Eva; Cuesta, Pedro; Anfruns, Josep; Molist, Miquel; Arroyo-Pardo, Eduardo; Turbón, Daniel

    2014-01-01

    The genetic impact associated to the Neolithic spread in Europe has been widely debated over the last 20 years. Within this context, ancient DNA studies have provided a more reliable picture by directly analyzing the protagonist populations at different regions in Europe. However, the lack of available data from the original Near Eastern farmers has limited the achieved conclusions, preventing the formulation of continental models of Neolithic expansion. Here we address this issue by presenting mitochondrial DNA data of the original Near-Eastern Neolithic communities with the aim of providing the adequate background for the interpretation of Neolithic genetic data from European samples. Sixty-three skeletons from the Pre Pottery Neolithic B (PPNB) sites of Tell Halula, Tell Ramad and Dja'de El Mughara dating between 8,700–6,600 cal. B.C. were analyzed, and 15 validated mitochondrial DNA profiles were recovered. In order to estimate the demographic contribution of the first farmers to both Central European and Western Mediterranean Neolithic cultures, haplotype and haplogroup diversities in the PPNB sample were compared using phylogeographic and population genetic analyses to available ancient DNA data from human remains belonging to the Linearbandkeramik-Alföldi Vonaldiszes Kerámia and Cardial/Epicardial cultures. We also searched for possible signatures of the original Neolithic expansion over the modern Near Eastern and South European genetic pools, and tried to infer possible routes of expansion by comparing the obtained results to a database of 60 modern populations from both regions. Comparisons performed among the 3 ancient datasets allowed us to identify K and N-derived mitochondrial DNA haplogroups as potential markers of the Neolithic expansion, whose genetic signature would have reached both the Iberian coasts and the Central European plain. Moreover, the observed genetic affinities between the PPNB samples and the modern populations of Cyprus and

  14. Multi-scale ancient DNA analyses confirm the western origin of Michelsberg farmers and document probable practices of human sacrifice.

    Directory of Open Access Journals (Sweden)

    Alice Beau

    Full Text Available In Europe, the Middle Neolithic is characterized by an important diversification of cultures. In northeastern France, the appearance of the Michelsberg culture has been correlated with major cultural changes and interpreted as the result of the settlement of new groups originating from the Paris Basin. This cultural transition has been accompanied by the expansion of particular funerary practices involving inhumations within circular pits and individuals in "non-conventional" positions (deposited in the pits without any particular treatment. If the status of such individuals has been highly debated, the sacrifice hypothesis has been retained for the site of Gougenheim (Alsace. At the regional level, the analysis of the Gougenheim mitochondrial gene pool (SNPs and HVR-I sequence analyses permitted us to highlight a major genetic break associated with the emergence of the Michelsberg in the region. This genetic discontinuity appeared to be linked to new affinities with farmers from the Paris Basin, correlated to a noticeable hunter-gatherer legacy. All of the evidence gathered supports (i the occidental origin of the Michelsberg groups and (ii the potential implication of this migration in the progression of the hunter-gatherer legacy from the Paris Basin to Alsace / Western Germany at the beginning of the Late Neolithic. At the local level, we noted some differences in the maternal gene pool of individuals in "conventional" vs. "non-conventional" positions. The relative genetic isolation of these sub-groups nicely echoes both their social distinction and the hypothesis of sacrifices retained for the site. Our investigation demonstrates that a multi-scale aDNA study of ancient communities offers a unique opportunity to disentangle the complex relationships between cultural and biological evolution.

  15. Multi-scale ancient DNA analyses confirm the western origin of Michelsberg farmers and document probable practices of human sacrifice.

    Science.gov (United States)

    Beau, Alice; Rivollat, Maïté; Réveillas, Hélène; Pemonge, Marie-Hélène; Mendisco, Fanny; Thomas, Yohann; Lefranc, Philippe; Deguilloux, Marie-France

    2017-01-01

    In Europe, the Middle Neolithic is characterized by an important diversification of cultures. In northeastern France, the appearance of the Michelsberg culture has been correlated with major cultural changes and interpreted as the result of the settlement of new groups originating from the Paris Basin. This cultural transition has been accompanied by the expansion of particular funerary practices involving inhumations within circular pits and individuals in "non-conventional" positions (deposited in the pits without any particular treatment). If the status of such individuals has been highly debated, the sacrifice hypothesis has been retained for the site of Gougenheim (Alsace). At the regional level, the analysis of the Gougenheim mitochondrial gene pool (SNPs and HVR-I sequence analyses) permitted us to highlight a major genetic break associated with the emergence of the Michelsberg in the region. This genetic discontinuity appeared to be linked to new affinities with farmers from the Paris Basin, correlated to a noticeable hunter-gatherer legacy. All of the evidence gathered supports (i) the occidental origin of the Michelsberg groups and (ii) the potential implication of this migration in the progression of the hunter-gatherer legacy from the Paris Basin to Alsace / Western Germany at the beginning of the Late Neolithic. At the local level, we noted some differences in the maternal gene pool of individuals in "conventional" vs. "non-conventional" positions. The relative genetic isolation of these sub-groups nicely echoes both their social distinction and the hypothesis of sacrifices retained for the site. Our investigation demonstrates that a multi-scale aDNA study of ancient communities offers a unique opportunity to disentangle the complex relationships between cultural and biological evolution.

  16. Kinship and Y-chromosome analysis of 7th century human remains: novel DNA extraction and typing procedure for ancient material.

    Science.gov (United States)

    Vanek, Daniel; Saskova, Lenka; Koch, Hubert

    2009-06-01

    To develop novel DNA extraction and typing procedure for DNA identification of the 7th century human remains, determine the familiar relationship between the individuals, estimate the Y-chromosome haplogroup, and compare the Y-chromosome haplotype with the contemporary populations. DNA from preserved femur samples was extracted using the modified silica-based extraction technique. Polymerase chain reaction amplification was performed using human identification kits MiniFiler, Identifiler, and Y-filer and also laboratory-developed and validated Y-chromosome short tandem repeat (STR) pentaplexes with short amplicons. For 244A, 244B, 244C samples, full autosomal DNA profiles (15 STR markers and Amelogenin) and for 244D, 244E, 244F samples, MiniFiler profiles were produced. Y-chromosome haplotypes consisting of up to 24 STR markers were determined and used to predict the Y-chromosome haplogroups and compare the resulting haplotypes with the current population. Samples 244A, 244B, 244C, and 244D belong to Y-chromosome haplogroup R1b and the samples 244E and 244F to haplogroup G2a. Comparison of ancient haplotypes with the current population yielded numerous close matches with genetic distance below 2. Application of forensic genetics in archaeology enables retrieving new types of information and helps in data interpretation. The number of successfully typed autosomal and Y-STR loci from ancient specimens in this study is one of the largest published so far for aged samples.

  17. Speaker Authentication

    CERN Document Server

    Li, Qi (Peter)

    2012-01-01

    This book focuses on use of voice as a biometric measure for personal authentication. In particular, "Speaker Recognition" covers two approaches in speaker authentication: speaker verification (SV) and verbal information verification (VIV). The SV approach attempts to verify a speaker’s identity based on his/her voice characteristics while the VIV approach validates a speaker’s identity through verification of the content of his/her utterance(s). SV and VIV can be combined for new applications. This is still a new research topic with significant potential applications. The book provides with a broad overview of the recent advances in speaker authentication while giving enough attention to advanced and useful algorithms and techniques. It also provides a step by step introduction to the current state of the speaker authentication technology, from the fundamental concepts to advanced algorithms. We will also present major design methodologies and share our experience in developing real and successful speake...

  18. Cheek tooth morphology and ancient mitochondrial DNA of late Pleistocene horses from the western interior of North America: Implications for the taxonomy of North American Late Pleistocene Equus.

    Directory of Open Access Journals (Sweden)

    Christina I Barrón-Ortiz

    Full Text Available Horses were a dominant component of North American Pleistocene land mammal communities and their remains are well represented in the fossil record. Despite the abundant material available for study, there is still considerable disagreement over the number of species of Equus that inhabited the different regions of the continent and on their taxonomic nomenclature. In this study, we investigated cheek tooth morphology and ancient mtDNA of late Pleistocene Equus specimens from the Western Interior of North America, with the objective of clarifying the species that lived in this region prior to the end-Pleistocene extinction. Based on the morphological and molecular data analyzed, a caballine (Equus ferus and a non-caballine (E. conversidens species were identified from different localities across most of the Western Interior. A second non-caballine species (E. cedralensis was recognized from southern localities based exclusively on the morphological analyses of the cheek teeth. Notably the separation into caballine and non-caballine species was observed in the Bayesian phylogenetic analysis of ancient mtDNA as well as in the geometric morphometric analyses of the upper and lower premolars. Teeth morphologically identified as E. conversidens that yielded ancient mtDNA fall within the New World stilt-legged clade recognized in previous studies and this is the name we apply to this group. Geographic variation in morphology in the caballine species is indicated by statistically different occlusal enamel patterns in the specimens from Bluefish Caves, Yukon Territory, relative to the specimens from the other geographic regions. Whether this represents ecomorphological variation and/or a certain degree of geographic and genetic isolation of these Arctic populations requires further study.

  19. Cheek tooth morphology and ancient mitochondrial DNA of late Pleistocene horses from the western interior of North America: Implications for the taxonomy of North American Late Pleistocene Equus.

    Science.gov (United States)

    Barrón-Ortiz, Christina I; Rodrigues, Antonia T; Theodor, Jessica M; Kooyman, Brian P; Yang, Dongya Y; Speller, Camilla F

    2017-01-01

    Horses were a dominant component of North American Pleistocene land mammal communities and their remains are well represented in the fossil record. Despite the abundant material available for study, there is still considerable disagreement over the number of species of Equus that inhabited the different regions of the continent and on their taxonomic nomenclature. In this study, we investigated cheek tooth morphology and ancient mtDNA of late Pleistocene Equus specimens from the Western Interior of North America, with the objective of clarifying the species that lived in this region prior to the end-Pleistocene extinction. Based on the morphological and molecular data analyzed, a caballine (Equus ferus) and a non-caballine (E. conversidens) species were identified from different localities across most of the Western Interior. A second non-caballine species (E. cedralensis) was recognized from southern localities based exclusively on the morphological analyses of the cheek teeth. Notably the separation into caballine and non-caballine species was observed in the Bayesian phylogenetic analysis of ancient mtDNA as well as in the geometric morphometric analyses of the upper and lower premolars. Teeth morphologically identified as E. conversidens that yielded ancient mtDNA fall within the New World stilt-legged clade recognized in previous studies and this is the name we apply to this group. Geographic variation in morphology in the caballine species is indicated by statistically different occlusal enamel patterns in the specimens from Bluefish Caves, Yukon Territory, relative to the specimens from the other geographic regions. Whether this represents ecomorphological variation and/or a certain degree of geographic and genetic isolation of these Arctic populations requires further study.

  20. The globalization of naval provisioning: ancient DNA and stable isotope analyses of stored cod from the wreck of the Mary Rose, AD 1545.

    Science.gov (United States)

    Hutchinson, William F; Culling, Mark; Orton, David C; Hänfling, Bernd; Lawson Handley, Lori; Hamilton-Dyer, Sheila; O'Connell, Tamsin C; Richards, Michael P; Barrett, James H

    2015-09-01

    A comparison of ancient DNA (single-nucleotide polymorphisms) and carbon and nitrogen stable isotope evidence suggests that stored cod provisions recovered from the wreck of the Tudor warship Mary Rose, which sank in the Solent, southern England, in 1545, had been caught in northern and transatlantic waters such as the northern North Sea and the fishing grounds of Iceland and Newfoundland. This discovery, underpinned by control data from archaeological samples of cod bones from potential source regions, illuminates the role of naval provisioning in the early development of extensive sea fisheries, with their long-term economic and ecological impacts.

  1. Pre-Columbian Population Dynamics and Cultural Development in South Coast Perú as Revealed by Analysis of Ancient DNA

    OpenAIRE

    Fehren-Schmitz, Lars

    2012-01-01

    In this paper I report on a study whose principal aim is to understand the development and decline of the southern Peruvian Nasca culture in the upper Río Grande de Nasca drainage, and its cultural and biological affinities to the preceding Paracas culture. Ancient DNA analyses were conducted on over 300 pre-Columbian individuals from various cemeteries in southern Perú, from periods ranging from the Formative Period to the Middle Horizon. Our results show that the Nasca populations are close...

  2. Identification of mtDNA lineages of Sus scrofa by multiplex single base extension for the authentication of processed food products.

    Science.gov (United States)

    van Asch, Barbara; Silva Santos, Liliana; Carneiro, Joao; Pereira, Filipe; Amorim, Antonio

    2011-07-13

    A genetic method to identify the breed of origin could serve as a useful tool for inspecting the authenticity of the increasing number of monobreed foodstuffs, such as those derived from small local European pig breeds. Mitochondrial DNA (mtDNA) is practically the only reliable genomic target for PCR in processed products, and its haploid nature and strict maternal inheritance greatly facilitate genetic analysis. As a result of strategies that sought to improve the production traits of European pigs, most industrial breeds presently show a high frequency of Asian alleles, while the absence or low frequency of such Asian alleles has been observed in small rustic breeds from which highly prized dry-cured and other traditional products are derived. Therefore, the detection of Asian ancestry would indicate nonconformity in Protected Denomination of Origin products. This study presents a single base extension assay based on 15 diagnostic mtDNA single nucleotide polymorphisms to discriminate between Asian and European Sus scrofa lineages. The test was robust, sensitive and accurate in a wide range of processed foodstuffs and allowed accurate detection of pig genetic material and identification of maternal ancestry. A market survey suggested that nonconformity of products derived from Portuguese breeds is an unusual event at present, but regular surveys both in the local populations and in commercial products would be advisible. Taking into consideration the limitations presented by other methodologies, this mtDNA-based test probably attains the highest resolution for the direct genetic test for population of origin in Sus scrofa food products.

  3. A comparative study of ancient environmental DNA to pollen and macrofossils from lake sediments reveals taxonomic overlap and additional plant taxa

    Science.gov (United States)

    Pedersen, Mikkel Winther; Ginolhac, Aurélien; Orlando, Ludovic; Olsen, Jesper; Andersen, Kenneth; Holm, Jakob; Funder, Svend; Willerslev, Eske; Kjær, Kurt H.

    2013-09-01

    We use 2nd generation sequencing technology on sedimentary ancient DNA (sedaDNA) from a lake in South Greenland to reconstruct the local floristic history around a low-arctic lake and compare the results with those previously obtained from pollen and macrofossils in the same lake. Thirty-eight of thirty-nine samples from the core yielded putative DNA sequences. Using a multiple assignment strategy on the trnL g-h DNA barcode, consisting of two different phylogenetic and one sequence similarity assignment approaches, thirteen families of plants were identified, of which two (Scrophulariaceae and Asparagaceae) are absent from the pollen and macrofossil records. An age model for the sediment based on twelve radiocarbon dates establishes a chronology and shows that the lake record dates back to 10,650 cal yr BP. Our results suggest that sedaDNA analysis from lake sediments, although taxonomically less detailed than pollen and macrofossil analyses can be a complementary tool for establishing the composition of both terrestrial and aquatic local plant communities and a method for identifying additional taxa.

  4. 800,000 year old mammoth DNA, modern elephant DNA or PCR artefact?

    DEFF Research Database (Denmark)

    Binladen, Jonas; Gilbert, M Thomas P; Willerslev, Eske

    2007-01-01

    Poulakakis and colleagues (Poulakakis et al. 2006: Biol. Lett. 2, 451-454), report the recovery of 'authentic' mammoth DNA from an 800,000-year-old fragment of bone excavated on the island of Crete. In light of results from other ancient DNA studies that indicate how DNA survival is unlikely in s...... polymorphisms. Finally, we demonstrate using a simple BLAST search in GenBank that the claimed 'uniquely derived character state' for mammoths is in fact also found within modern elephants. Udgivelsesdato: 2007-Feb-22...

  5. Mitochondrial DNA diversity of modern, ancient and wild sheep(Ovis gmelinii anatolica) from Turkey: new insights on the evolutionary history of sheep.

    Science.gov (United States)

    Demirci, Sevgin; Koban Baştanlar, Evren; Dağtaş, Nihan Dilşad; Pişkin, Evangelia; Engin, Atilla; Ozer, Füsun; Yüncü, Eren; Doğan, Sükrü Anıl; Togan, Inci

    2013-01-01

    In the present study, to contribute to the understanding of the evolutionary history of sheep, the mitochondrial (mt) DNA polymorphisms occurring in modern Turkish native domestic (n = 628), modern wild (Ovis gmelinii anatolica) (n = 30) and ancient domestic sheep from Oylum Höyük in Kilis (n = 33) were examined comparatively with the accumulated data in the literature. The lengths (75 bp/76 bp) of the second and subsequent repeat units of the mtDNA control region (CR) sequences differentiated the five haplogroups (HPGs) observed in the domestic sheep into two genetic clusters as was already implied by other mtDNA markers: the first cluster being composed of HPGs A, B, D and the second cluster harboring HPGs C, E. To manifest genetic relatedness between wild Ovis gmelinii and domestic sheep haplogroups, their partial cytochrome B sequences were examined together on a median-joining network. The two parallel but wider aforementioned clusters were observed also on the network of Ovis gmelenii individuals, within which domestic haplogroups were embedded. The Ovis gmelinii wilds of the present day appeared to be distributed on two partially overlapping geographic areas parallel to the genetic clusters that they belong to (the first cluster being in the western part of the overall distribution). Thus, the analyses suggested that the domestic sheep may be the products of two maternally distinct ancestral Ovis gmelinii populations. Furthermore, Ovis gmelinii anatolica individuals exhibited a haplotype of HPG A (n = 22) and another haplotype (n = 8) from the second cluster which was not observed among the modern domestic sheep. HPG E, with the newly observed members (n = 11), showed signs of expansion. Studies of ancient and modern mtDNA suggest that HPG C frequency increased in the Southeast Anatolia from 6% to 22% some time after the beginning of the Hellenistic period, 500 years Before Common Era (BCE).

  6. Efficiency of matK, rbcL, trnH-psbA, and trnL-F (cpDNA) to Molecularly Authenticate Philippine Ethnomedicinal Apocynaceae Through DNA Barcoding.

    Science.gov (United States)

    Cabelin, Vincent Louie Domingo; Alejandro, Grecebio Jonathan Duran

    2016-05-01

    The Philippines is home to some ethnomedicinal Apocynaceae that has been used to cure common ailments. They are perceived to be safe, but misidentification can lead to substitution and adulteration. Morphological characters are primarily utilized to identify these species but a new method utilizing molecular characters called DNA barcoding has emerged. In this study, the efficiency of matK, rbcL, trnH-psbA, and trnL-F to molecularly authenticate selected Apocynaceae species were tested. Genomic DNA from silica-dried leaf samples were isolated and used as a template for generating DNA barcodes. Pair-wise sequence divergence using Kimura-2-Parameter was used to analyze inter-specific and intraspecific variations among the barcodes, whereas basic local alignment search tool (BLAST) and neighbor-joining (NJ) analyses were employed to examine discrimination success. The results show that matK is the best barcode for Apocynaceae as it has the highest amplification and sequencing success together with rbcL while having high inter-specific and low intra-specific divergence relative to the other candidate barcodes. Furthermore, matK provided the highest discrimination both in BLAST and NJ analyses. This study proposes the use of matK as the principal barcode for Apocynaceae. Both matK and rbcL have higher universality compared to trnH-psbA and trnL-F matK has relatively high inter-specific divergence and very minimal intra-specific divergencematK is the best barcode to molecularly authenticate Apocynaceae with either trnH-psbA or trnL-F as supplements. Abbreviations used: K2P: Kimura-2-parameter, BLAST: Basic local alignment search tool, NJ: Neighbor-joining.

  7. System and method for authentication

    Science.gov (United States)

    Duerksen, Gary L.; Miller, Seth A.

    2015-12-29

    Described are methods and systems for determining authenticity. For example, the method may include providing an object of authentication, capturing characteristic data from the object of authentication, deriving authentication data from the characteristic data of the object of authentication, and comparing the authentication data with an electronic database comprising reference authentication data to provide an authenticity score for the object of authentication. The reference authentication data may correspond to one or more reference objects of authentication other than the object of authentication.

  8. Tamil merchant in ancient Mesopotamia.

    Directory of Open Access Journals (Sweden)

    Malliya Gounder Palanichamy

    Full Text Available Recent analyses of ancient Mesopotamian mitochondrial genomes have suggested a genetic link between the Indian subcontinent and Mesopotamian civilization. There is no consensus on the origin of the ancient Mesopotamians. They may be descendants of migrants, who founded regional Mesopotamian groups like that of Terqa or they may be merchants who were involved in trans Mesopotamia trade. To identify the Indian source population showing linkage to the ancient Mesopotamians, we screened a total of 15,751 mitochondrial DNAs (11,432 from the literature and 4,319 from this study representing all major populations of India. Our results although suggest that south India (Tamil Nadu and northeast India served as the source of the ancient Mesopotamian mtDNA gene pool, mtDNA of these ancient Mesopotamians probably contributed by Tamil merchants who were involved in the Indo-Roman trade.

  9. Tamil Merchant in Ancient Mesopotamia

    Science.gov (United States)

    Palanichamy, Malliya gounder; Mitra, Bikash; Debnath, Monojit; Agrawal, Suraksha; Chaudhuri, Tapas Kumar; Zhang, Ya-Ping

    2014-01-01

    Recent analyses of ancient Mesopotamian mitochondrial genomes have suggested a genetic link between the Indian subcontinent and Mesopotamian civilization. There is no consensus on the origin of the ancient Mesopotamians. They may be descendants of migrants, who founded regional Mesopotamian groups like that of Terqa or they may be merchants who were involved in trans Mesopotamia trade. To identify the Indian source population showing linkage to the ancient Mesopotamians, we screened a total of 15,751 mitochondrial DNAs (11,432 from the literature and 4,319 from this study) representing all major populations of India. Our results although suggest that south India (Tamil Nadu) and northeast India served as the source of the ancient Mesopotamian mtDNA gene pool, mtDNA of these ancient Mesopotamians probably contributed by Tamil merchants who were involved in the Indo-Roman trade. PMID:25299580

  10. Tamil merchant in ancient Mesopotamia.

    Science.gov (United States)

    Palanichamy, Malliya Gounder; Mitra, Bikash; Debnath, Monojit; Agrawal, Suraksha; Chaudhuri, Tapas Kumar; Zhang, Ya-Ping

    2014-01-01

    Recent analyses of ancient Mesopotamian mitochondrial genomes have suggested a genetic link between the Indian subcontinent and Mesopotamian civilization. There is no consensus on the origin of the ancient Mesopotamians. They may be descendants of migrants, who founded regional Mesopotamian groups like that of Terqa or they may be merchants who were involved in trans Mesopotamia trade. To identify the Indian source population showing linkage to the ancient Mesopotamians, we screened a total of 15,751 mitochondrial DNAs (11,432 from the literature and 4,319 from this study) representing all major populations of India. Our results although suggest that south India (Tamil Nadu) and northeast India served as the source of the ancient Mesopotamian mtDNA gene pool, mtDNA of these ancient Mesopotamians probably contributed by Tamil merchants who were involved in the Indo-Roman trade.

  11. Ancient Egypt.

    Science.gov (United States)

    Evers, Virginia

    This four-week fourth grade social studies unit dealing with religious dimensions in ancient Egyptian culture was developed by the Public Education Religion Studies Center at Wright State University. It seeks to help students understand ancient Egypt by looking at the people, the culture, and the people's world view. The unit begins with outlines…

  12. The History of Tree and Shrub Taxa on Bol'shoy Lyakhovsky Island (New Siberian Archipelago since the Last Interglacial Uncovered by Sedimentary Ancient DNA and Pollen Data

    Directory of Open Access Journals (Sweden)

    Heike H. Zimmermann

    2017-10-01

    Full Text Available Ecosystem boundaries, such as the Arctic-Boreal treeline, are strongly coupled with climate and were spatially highly dynamic during past glacial-interglacial cycles. Only a few studies cover vegetation changes since the last interglacial, as most of the former landscapes are inundated and difficult to access. Using pollen analysis and sedimentary ancient DNA (sedaDNA metabarcoding, we reveal vegetation changes on Bol’shoy Lyakhovsky Island since the last interglacial from permafrost sediments. Last interglacial samples depict high levels of floral diversity with the presence of trees (Larix, Picea, Populus and shrubs (Alnus, Betula, Ribes, Cornus, Saliceae on the currently treeless island. After the Last Glacial Maximum, Larix re-colonised the island but disappeared along with most shrub taxa. This was probably caused by Holocene sea-level rise, which led to increased oceanic conditions on the island. Additionally, we applied two newly developed larch-specific chloroplast markers to evaluate their potential for tracking past population dynamics from environmental samples. The novel markers were successfully re-sequenced and exhibited two variants of each marker in last interglacial samples. SedaDNA can track vegetation changes as well as genetic changes across geographic space through time and can improve our understanding of past processes that shape modern patterns.

  13. Ancient DNA from hunter-gatherer and farmer groups from Northern Spain supports a random dispersion model for the Neolithic expansion into Europe.

    Directory of Open Access Journals (Sweden)

    Montserrat Hervella

    Full Text Available BACKGROUND/PRINCIPAL FINDINGS: The phenomenon of Neolithisation refers to the transition of prehistoric populations from a hunter-gatherer to an agro-pastoralist lifestyle. Traditionally, the spread of an agro-pastoralist economy into Europe has been framed within a dichotomy based either on an acculturation phenomenon or on a demic diffusion. However, the nature and speed of this transition is a matter of continuing scientific debate in archaeology, anthropology, and human population genetics. In the present study, we have analyzed the mitochondrial DNA diversity in hunter-gatherers and first farmers from Northern Spain, in relation to the debate surrounding the phenomenon of Neolithisation in Europe. METHODOLOGY/SIGNIFICANCE: Analysis of mitochondrial DNA was carried out on 54 individuals from Upper Paleolithic and Early Neolithic, which were recovered from nine archaeological sites from Northern Spain (Basque Country, Navarre and Cantabria. In addition, to take all necessary precautions to avoid contamination, different authentication criteria were applied in this study, including: DNA quantification, cloning, duplication (51% of the samples and replication of the results (43% of the samples by two independent laboratories. Statistical and multivariate analyses of the mitochondrial variability suggest that the genetic influence of Neolithisation did not spread uniformly throughout Europe, producing heterogeneous genetic consequences in different geographical regions, rejecting the traditional models that explain the Neolithisation in Europe. CONCLUSION: The differences detected in the mitochondrial DNA lineages of Neolithic groups studied so far (including these ones of this study suggest different genetic impact of Neolithic in Central Europe, Mediterranean Europe and the Cantabrian fringe. The genetic data obtained in this study provide support for a random dispersion model for Neolithic farmers. This random dispersion had a different

  14. Evidence of a high-Andean, mid-Holocene plant community: An ancient DNA analysis of glacially preserved remains.

    Science.gov (United States)

    Gould, Billie A; León, Blanca; Buffen, Aron M; Thompson, Lonnie G

    2010-09-01

    Around the world, tropical glaciers and ice caps are retreating at unprecedented rates because of climate change. In at least one location, along the margin of the Quelccaya Ice Cap in southeastern Peru, ancient plant remains have been continually uncovered since 2002. We used genetic analysis to identify plants that existed at these sites during the mid-Holocene. • We examined remains between 4576 and 5222 yr old, using PCR amplification, cloning, and sequencing of a fragment of the chloroplast trnL intron. We then matched these sequences to sequences in GenBank. • We found evidence of at least five taxa characteristic of wetlands, which occur primarily at lower elevations in the region today. • A diverse community most likely existed at these locations the last time they were ice-free and thus has the potential to reestablish with time. This is the first genetic analysis of vegetation uncovered by receding glacial ice, and it may become one of many as ancient plant materials are newly uncovered in a changing climate.

  15. Pre-Whaling Genetic Diversity and Population Ecology in Eastern Pacific Gray Whales: Insights from Ancient DNA and Stable Isotopes

    Science.gov (United States)

    Alter, S. Elizabeth; Newsome, Seth D.; Palumbi, Stephen R.

    2012-01-01

    Commercial whaling decimated many whale populations, including the eastern Pacific gray whale, but little is known about how population dynamics or ecology differed prior to these removals. Of particular interest is the possibility of a large population decline prior to whaling, as such a decline could explain the ∼5-fold difference between genetic estimates of prior abundance and estimates based on historical records. We analyzed genetic (mitochondrial control region) and isotopic information from modern and prehistoric gray whales using serial coalescent simulations and Bayesian skyline analyses to test for a pre-whaling decline and to examine prehistoric genetic diversity, population dynamics and ecology. Simulations demonstrate that significant genetic differences observed between ancient and modern samples could be caused by a large, recent population bottleneck, roughly concurrent with commercial whaling. Stable isotopes show minimal differences between modern and ancient gray whale foraging ecology. Using rejection-based Approximate Bayesian Computation, we estimate the size of the population bottleneck at its minimum abundance and the pre-bottleneck abundance. Our results agree with previous genetic studies suggesting the historical size of the eastern gray whale population was roughly three to five times its current size. PMID:22590499

  16. Pre-whaling genetic diversity and population ecology in eastern Pacific gray whales: insights from ancient DNA and stable isotopes.

    Science.gov (United States)

    Alter, S Elizabeth; Newsome, Seth D; Palumbi, Stephen R

    2012-01-01

    Commercial whaling decimated many whale populations, including the eastern Pacific gray whale, but little is known about how population dynamics or ecology differed prior to these removals. Of particular interest is the possibility of a large population decline prior to whaling, as such a decline could explain the ~5-fold difference between genetic estimates of prior abundance and estimates based on historical records. We analyzed genetic (mitochondrial control region) and isotopic information from modern and prehistoric gray whales using serial coalescent simulations and Bayesian skyline analyses to test for a pre-whaling decline and to examine prehistoric genetic diversity, population dynamics and ecology. Simulations demonstrate that significant genetic differences observed between ancient and modern samples could be caused by a large, recent population bottleneck, roughly concurrent with commercial whaling. Stable isotopes show minimal differences between modern and ancient gray whale foraging ecology. Using rejection-based Approximate Bayesian Computation, we estimate the size of the population bottleneck at its minimum abundance and the pre-bottleneck abundance. Our results agree with previous genetic studies suggesting the historical size of the eastern gray whale population was roughly three to five times its current size.

  17. Pre-whaling genetic diversity and population ecology in eastern Pacific gray whales: insights from ancient DNA and stable isotopes.

    Directory of Open Access Journals (Sweden)

    S Elizabeth Alter

    Full Text Available Commercial whaling decimated many whale populations, including the eastern Pacific gray whale, but little is known about how population dynamics or ecology differed prior to these removals. Of particular interest is the possibility of a large population decline prior to whaling, as such a decline could explain the ~5-fold difference between genetic estimates of prior abundance and estimates based on historical records. We analyzed genetic (mitochondrial control region and isotopic information from modern and prehistoric gray whales using serial coalescent simulations and Bayesian skyline analyses to test for a pre-whaling decline and to examine prehistoric genetic diversity, population dynamics and ecology. Simulations demonstrate that significant genetic differences observed between ancient and modern samples could be caused by a large, recent population bottleneck, roughly concurrent with commercial whaling. Stable isotopes show minimal differences between modern and ancient gray whale foraging ecology. Using rejection-based Approximate Bayesian Computation, we estimate the size of the population bottleneck at its minimum abundance and the pre-bottleneck abundance. Our results agree with previous genetic studies suggesting the historical size of the eastern gray whale population was roughly three to five times its current size.

  18. Authentic Teachers: Student Criteria Perceiving Authenticity of Teachers

    Science.gov (United States)

    De Bruyckere, Pedro; Kirschner, Paul A.

    2016-01-01

    Authenticity is seen by many as a key for good learning and education. There is talk of authentic instruction, authentic learning, authentic problems, authentic assessment, authentic tools and authentic teachers. The problem is that while authenticity is an often-used adjective describing almost all aspects of teaching and learning, the concept…

  19. Authentication of medicinal plant botanical identity by amplified fragmented length polymorphism dominant DNA marker: inferences from the Plectranthus genus.

    Science.gov (United States)

    Passinho-Soares, Helna; Felix, Durvalina; Kaplan, Maria Auxiliadora; Margis-Pinheiro, Marcia; Margis, Rogério

    2006-08-01

    In Brazil, Plectranthus species are known as "boldo" and have been used in popular medicine for analgesic and dyspeptic purposes. Plectranthus need to be well identified in order to be used as commercially genuine medicinal plants. Here we describe AFLP DNA patterns able to distinguish among different Pectranthus species. The genetic variability of P. grandis Cramer, P. barbatus Andr. and P. ornatus Codd was analyzed with two sets of AFLP primers allowing detection of 241 loci. A total of 22 monomorphic loci were identified in P. barbatus, 15 in P. grandis and 30 in P. ornatus. Among these, 5 loci were informative and species-specific to P. barbatus, 3 to P. grandis and 2 loci were unique to P. ornatus. The AFLP pattern analyzed by different clustering methods assembled individuals according to their species. So far, AFLP represents a genuine and strong method to certify medicinal plant materials.

  20. Tibetan Interpretations of Authenticity

    DEFF Research Database (Denmark)

    Sobisch, Jan-Ulrich

    2015-01-01

    The four means of authentication are arguments for the authentication of Buddhist teachings in a Tibetan tradition. Different traditions emphasize different means of authentication. These reveal interesting facts about the self-image of these traditions.......The four means of authentication are arguments for the authentication of Buddhist teachings in a Tibetan tradition. Different traditions emphasize different means of authentication. These reveal interesting facts about the self-image of these traditions....

  1. AIS authentication

    CERN Multimedia

    2006-01-01

    Users are invited to use the NICE password for AIS authentication. As announced in CNL June-August 2006 (see http://www.cerncourier.com/articles/cnl/3/6/14/1) it is possible to use the NICE username and password to log on to AIS. The procedure is now fully operational and users can themselves reset the AIS password such that the NICE password will be used for authentication required by AIS applications. We strongly recommend CERN users who have a NICE account (this is the case of most users) to do this, with the objective to reduce the number of passwords they need to remember. This can be achieved very easily, directly from the Change Password option on the AIS login (https://aislogin.cern.ch/). Users should just select the '[Change Password]' option displayed at the bottom of the page, provide the 'Old Password' and then click on the button 'Use Nice password' followed by 'Submit'. Change Password option on the AIS login windowSetting the AIS password - Use Nice Password It should be noted that the proce...

  2. The genome of the brown alga Ectocarpus siliculosus contains a series of viral DNA pieces, suggesting an ancient association with large dsDNA viruses

    Directory of Open Access Journals (Sweden)

    Boland Wilhelm

    2008-04-01

    Full Text Available Abstract Background Ectocarpus siliculosus virus-1 (EsV-1 is a lysogenic dsDNA virus belonging to the super family of nucleocytoplasmic large DNA viruses (NCLDV that infect Ectocarpus siliculosus, a marine filamentous brown alga. Previous studies indicated that the viral genome is integrated into the host DNA. In order to find the integration sites of the viral genome, a genomic library from EsV-1-infected algae was screened using labelled EsV-1 DNA. Several fragments were isolated and some of them were sequenced and analyzed in detail. Results Analysis revealed that the algal genome is split by a copy of viral sequences that have a high identity to EsV-1 DNA sequences. These fragments are interspersed with DNA repeats, pseudogenes and genes coding for products involved in DNA replication, integration and transposition. Some of these gene products are not encoded by EsV-1 but are present in the genome of other members of the NCLDV family. Further analysis suggests that the Ectocarpus algal genome contains traces of the integration of a large dsDNA viral genome; this genome could be the ancestor of the extant NCLDV genomes. Furthermore, several lines of evidence indicate that the EsV-1 genome might have originated in these viral DNA pieces, implying the existence of a complex integration and recombination system. A protein similar to a new class of tyrosine recombinases might be a key enzyme of this system. Conclusion Our results support the hypothesis that some dsDNA viruses are monophyletic and evolved principally through genome reduction. Moreover, we hypothesize that phaeoviruses have probably developed an original replication system.

  3. Ancient mtDNA Analysis of Early 16th Century Caribbean Cattle Provides Insight into Founding Populations of New World Creole Cattle Breeds

    Science.gov (United States)

    Speller, Camilla F.; Burley, David V.; Woodward, Robyn P.; Yang, Dongya Y.

    2013-01-01

    The Columbian Exchange resulted in a widespread movement of humans, plants and animals between the Old and New Worlds. The late 15th to early 16th century transfer of cattle from the Iberian Peninsula and Canary Islands to the Caribbean laid the foundation for the development of American creole cattle (Bos taurus) breeds. Genetic analyses of modern cattle from the Americas reveal a mixed ancestry of European, African and Indian origins. Recent debate in the genetic literature centers on the ‘African’ haplogroup T1 and its subhaplogroups, alternatively tying their origins to the initial Spanish herds, and/or from subsequent movements of taurine cattle through the African slave trade. We examine this problem through ancient DNA analysis of early 16th century cattle bone from Sevilla la Nueva, the first Spanish colony in Jamaica. In spite of poor DNA preservation, both T3 and T1 haplogroups were identified in the cattle remains, confirming the presence of T1 in the earliest Spanish herds. The absence, however, of “African-derived American” haplotypes (AA/T1c1a1) in the Sevilla la Nueva sample, leaves open the origins of this sub-haplogroup in contemporary Caribbean cattle. PMID:23894505

  4. Statistical Methods for Population Genetic Inference Based on Low-Depth Sequencing Data from Modern and Ancient DNA

    DEFF Research Database (Denmark)

    Korneliussen, Thorfinn Sand

    Due to the recent advances in DNA sequencing technology genomic data are being generated at an unprecedented rate and we are gaining access to entire genomes at population level. The technology does, however, not give direct access to the genetic variation and the many levels of preprocessing tha...

  5. Nuclear counterparts of the cytoplasmic mitochondrial 12S rRNA gene: a problem of ancient DNA and molecular phylogenies

    NARCIS (Netherlands)

    van der Kuyl, A. C.; Kuiken, C. L.; Dekker, J. T.; Perizonius, W. R.; Goudsmit, J.

    1995-01-01

    Monkey mummy bones and teeth originating from the North Saqqara Baboon Galleries (Egypt), soft tissue from a mummified baboon in a museum collection, and nineteenth/twentieth-century skin fragments from mangabeys were used for DNA extraction and PCR amplification of part of the mitochondrial 12S

  6. Should Teachers Be Authentic?

    Science.gov (United States)

    Bialystok, Lauren

    2015-01-01

    Authenticity is often touted as an important virtue for teachers. But what do we mean when we say that a teacher ought to be "authentic"? Research shows that discussions of teacher authenticity frequently refer to other character traits or simply to teacher effectiveness, but authenticity is a unique concept with a long philosophical…

  7. Ancient human mitochondrial DNA and radiocarbon analysis of archived quids from the Mule Spring Rockshelter, Nevada, USA

    Science.gov (United States)

    Hristova, Lidia T.; Edwards, Susan R.; Wedding, Jeffrey R.; Snow, Meradeth; Kruger, Brittany R.; Moser, Duane P.

    2018-01-01

    Chewed and expectorated quids, indigestible stringy fibers from the roasted inner pulp of agave or yucca root, have proven resilient over long periods of time in dry cave environments and correspondingly, although little studied, are common in archaeological archives. In the late 1960s, thousands of quids were recovered from Mule Spring Rockshelter (Nevada, USA) deposits and stored without consideration to DNA preservation in a museum collection, remaining unstudied for over fifty years. To assess the utility of these materials as repositories for genetic information about past inhabitants of the region and their movements, twenty-one quids were selected from arbitrary excavation depths for detailed analysis. Human mitochondrial DNA sequences from the quids were amplified by PCR and screened for diagnostic single nucleotide polymorphisms. Most detected single nucleotide polymorphisms were consistent with recognized Native American haplogroup subclades B2a5, B2i1, C1, C1c, C1c2, and D1; with the majority of the sample set consistent with subclades C1, C1c, and C1c2. In parallel with the DNA analysis, each quid was radiocarbon dated, revealing a time-resolved pattern of occupancy from 347 to 977 calibrated years before present. In particular, this dataset reveals strong evidence for the presence of haplogroup C1/C1c at the Southwestern edge of the US Great Basin from ~670 to 980 cal YBP, which may temporally correspond with the beginnings of the so-called Numic Spread into the region. The research described here demonstrates an approach which combines targeted DNA analysis with radiocarbon age dating; thus enabling the genetic analysis of archaeological materials of uncertain stratigraphic context. Here we present a survey of the maternal genetic profiles from people who used the Mule Spring Rockshelter and the historic timing of their utilization of a key natural resource. PMID:29522562

  8. Definition of Entity Authentication

    DEFF Research Database (Denmark)

    Ahmed, Naveed; Jensen, Christian D.

    2010-01-01

    Authentication is considered a pre-requisite for communication security, but the definition of authentication is generally not agreed upon. Many attacks on authentication protocols are the result of misunderstanding of the goals of authentication. This state of affairs indicate limitations...... in theoretical understanding of the meanings of authentication. We provide a new insight in this direction and formalize it in CFPS (Common Framework for authentication Protocols' Specifications). CFPS provides a precise scope of definition for authentication protocols, which could make the design and analysis...

  9. Authenticating the Leader

    DEFF Research Database (Denmark)

    Johnsen, Christian Garmann

    As authentic leadership, with its dictum of being true to the self, has become increasingly influential among practitioners and mainstream leadership scholars, critical writers have drawn attention to the negative consequences of this development. Yet, few scholars have investigated the problem...... of authentication within discourse of authentic leadership. If authentic leadership is to make any sense, it is necessary to be able to distinguish the authentic from the inauthentic leader – in other words, it is necessary to authenticate the leader. This paper uses Gilles Deleuze’s reading of Plato as the point...... of departure for discussing the problem of authentication – separating the authentic leader form the inauthentic one – in the leadership guru Bill George’s model of authentic leadership. By doing so, the paper offers a way of conceptualizing the problem of authenticating leaders, as well as challenging...

  10. Revealing the maternal demographic history of Panthera leo using ancient DNA and a spatially explicit genealogical analysis.

    Science.gov (United States)

    Barnett, Ross; Yamaguchi, Nobuyuki; Shapiro, Beth; Ho, Simon Y W; Barnes, Ian; Sabin, Richard; Werdelin, Lars; Cuisin, Jacques; Larson, Greger

    2014-04-02

    Understanding the demographic history of a population is critical to conservation and to our broader understanding of evolutionary processes. For many tropical large mammals, however, this aim is confounded by the absence of fossil material and by the misleading signal obtained from genetic data of recently fragmented and isolated populations. This is particularly true for the lion which as a consequence of millennia of human persecution, has large gaps in its natural distribution and several recently extinct populations. We sequenced mitochondrial DNA from museum-preserved individuals, including the extinct Barbary lion (Panthera leo leo) and Iranian lion (P. l. persica), as well as lions from West and Central Africa. We added these to a broader sample of lion sequences, resulting in a data set spanning the historical range of lions. Our Bayesian phylogeographical analyses provide evidence for highly supported, reciprocally monophyletic lion clades. Using a molecular clock, we estimated that recent lion lineages began to diverge in the Late Pleistocene. Expanding equatorial rainforest probably separated lions in South and East Africa from other populations. West African lions then expanded into Central Africa during periods of rainforest contraction. Lastly, we found evidence of two separate incursions into Asia from North Africa, first into India and later into the Middle East. We have identified deep, well-supported splits within the mitochondrial phylogeny of African lions, arguing for recognition of some regional populations as worthy of independent conservation. More morphological and nuclear DNA data are now needed to test these subdivisions.

  11. Detection of 400-year-old Yersinia pestis DNA in human dental pulp: An approach to the diagnosis of ancient septicemia

    OpenAIRE

    Drancourt, Michel; Aboudharam, Gérard; Signoli, Michel; Dutour, Olivier; Raoult, Didier

    1998-01-01

    Ancient septicemic plague epidemics were reported to have killed millions of people for 2 millenniums. However, confident diagnosis of ancient septicemia solely on the basis of historical clinical observations is not possible. The lack of suitable infected material has prevented direct demonstration of ancient septicemia; thus, the history of most infections such as plague remains hypothetical. The durability of dental pulp, together with its natural sterility, makes it a suitable material on...

  12. Genetic characteristics and migration history of a bronze culture population in the West Liao-River valley revealed by ancient DNA.

    Science.gov (United States)

    Li, Hongjie; Zhao, Xin; Zhao, Yongbin; Li, Chunxiang; Si, Dayong; Zhou, Hui; Cui, Yinqiu

    2011-12-01

    In order to study the genetic characteristics of the Lower Xiajiadian culture (LXC) population, a main bronze culture branch in northern China dated 4500-3500 years ago, two uniparentally inherited markers, mitochondrial DNA and Y-chromosome single-nucleotide polymorphisms (Y-SNPs), were analyzed on 14 human remains excavated from the Dadianzi site. The 14 sequences, which contained 13 haplotypes, were assigned to 9 haplogroups, and Y-SNP typing of 5 male individuals assigned them to haplogroups N (M231) and O3 (M122). The results indicate that the LXC population mainly included people carrying haplogroups from northern Asia who had lived in this region since the Neolithic period, as well as genetic evidence of immigration from the Central Plain. Later in the Bronze Age, part of the population migrated to the south away from a cooler climate, which ultimately influenced the gene pool in the Central Plain. Thus, climate change is an important factor, which drove the population migration during the Bronze Age in northern China. Based on these results, the local genetic continuity did not seem to be affected by outward migration, although more data are needed especially from other ancient populations to determine the influence of return migration on genetic continuity.

  13. Range shifts or extinction? Ancient DNA and distribution modelling reveal past and future responses to climate warming in cold-adapted birds.

    Science.gov (United States)

    Lagerholm, Vendela K; Sandoval-Castellanos, Edson; Vaniscotte, Amélie; Potapova, Olga R; Tomek, Teresa; Bochenski, Zbigniew M; Shepherd, Paul; Barton, Nick; Van Dyck, Marie-Claire; Miller, Rebecca; Höglund, Jacob; Yoccoz, Nigel G; Dalén, Love; Stewart, John R

    2017-04-01

    Global warming is predicted to cause substantial habitat rearrangements, with the most severe effects expected to occur in high-latitude biomes. However, one major uncertainty is whether species will be able to shift their ranges to keep pace with climate-driven environmental changes. Many recent studies on mammals have shown that past range contractions have been associated with local extinctions rather than survival by habitat tracking. Here, we have used an interdisciplinary approach that combines ancient DNA techniques, coalescent simulations and species distribution modelling, to investigate how two common cold-adapted bird species, willow and rock ptarmigan (Lagopus lagopus and Lagopus muta), respond to long-term climate warming. Contrary to previous findings in mammals, we demonstrate a genetic continuity in Europe over the last 20 millennia. Results from back-casted species distribution models suggest that this continuity may have been facilitated by uninterrupted habitat availability and potentially also the greater dispersal ability of birds. However, our predictions show that in the near future, some isolated regions will have little suitable habitat left, implying a future decrease in local populations at a scale unprecedented since the last glacial maximum. © 2016 John Wiley & Sons Ltd.

  14. Analysis of ancient human mitochondrial DNA from the Xiaohe cemetery: insights into prehistoric population movements in the Tarim Basin, China.

    Science.gov (United States)

    Li, Chunxiang; Ning, Chao; Hagelberg, Erika; Li, Hongjie; Zhao, Yongbin; Li, Wenying; Abuduresule, Idelisi; Zhu, Hong; Zhou, Hui

    2015-07-08

    The Tarim Basin in western China, known for its amazingly well-preserved mummies, has been for thousands of years an important crossroad between the eastern and western parts of Eurasia. Despite its key position in communications and migration, and highly diverse peoples, languages and cultures, its prehistory is poorly understood. To shed light on the origin of the populations of the Tarim Basin, we analysed mitochondrial DNA polymorphisms in human skeletal remains excavated from the Xiaohe cemetery, used by the local community between 4000 and 3500 years before present, and possibly representing some of the earliest settlers. Xiaohe people carried a wide variety of maternal lineages, including West Eurasian lineages H, K, U5, U7, U2e, T, R*, East Eurasian lineages B, C4, C5, D, G2a and Indian lineage M5. Our results indicate that the people of the Tarim Basin had a diverse maternal ancestry, with origins in Europe, central/eastern Siberia and southern/western Asia. These findings, together with information on the cultural context of the Xiaohe cemetery, can be used to test contrasting hypotheses of route of settlement into the Tarim Basin.

  15. DNA repair enzyme APE1 from evolutionarily ancient Hydra reveals redox activity exclusively found in mammalian APE1.

    Science.gov (United States)

    Pekhale, Komal; Haval, Gauri; Perween, Nusrat; Antoniali, Giulia; Tell, Gianluca; Ghaskadbi, Surendra; Ghaskadbi, Saroj

    2017-11-01

    Only mammalian apurinic/apyrimidinic endonuclease1 (APE1) has been reported to possess both DNA repair and redox activities. C terminal of the protein is required for base excision repair, while the redox activity resides in the N terminal due to cysteine residues at specific positions. APE1s from other organisms studied so far lack the redox activity in spite of having the N terminal domain. We find that APE1 from the Cnidarian Hydra exhibits both endonuclease and redox activities similar to mammalian APE1. We further show the presence of the three indispensable cysteines in Hydra APE1 for redox activity by site directed mutagenesis. Importance of redox domain but not the repair domain of APE1 in regeneration has been demonstrated by using domain-specific inhibitors. Our findings clearly demonstrate that the redox function of APE1 evolved very early in metazoan evolution and is not a recent acquisition in mammalian APE1 as believed so far. Copyright © 2017 Elsevier B.V. All rights reserved.

  16. Vein matching using artificial neural network in vein authentication systems

    Science.gov (United States)

    Noori Hoshyar, Azadeh; Sulaiman, Riza

    2011-10-01

    Personal identification technology as security systems is developing rapidly. Traditional authentication modes like key; password; card are not safe enough because they could be stolen or easily forgotten. Biometric as developed technology has been applied to a wide range of systems. According to different researchers, vein biometric is a good candidate among other biometric traits such as fingerprint, hand geometry, voice, DNA and etc for authentication systems. Vein authentication systems can be designed by different methodologies. All the methodologies consist of matching stage which is too important for final verification of the system. Neural Network is an effective methodology for matching and recognizing individuals in authentication systems. Therefore, this paper explains and implements the Neural Network methodology for finger vein authentication system. Neural Network is trained in Matlab to match the vein features of authentication system. The Network simulation shows the quality of matching as 95% which is a good performance for authentication system matching.

  17. Post-Session Authentication

    DEFF Research Database (Denmark)

    Ahmed, Naveed; Jensen, Christian D.

    2012-01-01

    Entity authentication provides confidence in the claimed identity of a peer entity, but the manner in which this goal is achieved results in different types of authentication. An important factor in this regard is the order between authentication and the execution of the associated session. In th...... as the only setup assumption. We hope post-session authentication can be used to devise new strategies for building trust among strangers....

  18. A complete mtDNA genome of an early modern human from Kostenki, Russia.

    Science.gov (United States)

    Krause, Johannes; Briggs, Adrian W; Kircher, Martin; Maricic, Tomislav; Zwyns, Nicolas; Derevianko, Anatoli; Pääbo, Svante

    2010-02-09

    The recovery of DNA sequences from early modern humans (EMHs) could shed light on their interactions with archaic groups such as Neandertals and their relationships to current human populations. However, such experiments are highly problematic because present-day human DNA frequently contaminates bones [1, 2]. For example, in a recent study of mitochondrial (mt) DNA from Neolithic European skeletons, sequence variants were only taken as authentic if they were absent or rare in the present population, whereas others had to be discounted as possible contamination [3, 4]. This limits analysis to EMH individuals carrying rare sequences and thus yields a biased view of the ancient gene pool. Other approaches of identifying contaminating DNA, such as genotyping all individuals who have come into contact with a sample, restrict analyses to specimens where this is possible [5, 6] and do not exclude all possible sources of contamination. By studying mtDNA in Neandertal remains, where contamination and endogenous DNA can be distinguished by sequence, we show that fragmentation patterns and nucleotide misincorporations can be used to gauge authenticity of ancient DNA sequences. We use these features to determine a complete mtDNA sequence from a approximately 30,000-year-old EMH from the Kostenki 14 site in Russia.

  19. Authenticity in Adult Learning

    Science.gov (United States)

    Ashton, Sam

    2010-01-01

    This paper is concerned with the relationship between authenticity and adult learning and prompted by some studies in which adult "authentic learning" is a central concept. The implication revealed by them is that real-worldness of learning contexts, learning content and learning tasks is perceived as conferring authenticity on learning. Here,…

  20. Authenticating the Leader

    DEFF Research Database (Denmark)

    Garmann Johnsen, Christian

    2018-01-01

    In the wake of a series of corporate scandals, there has been a growing call for authentic leadership in order to ensure ethical conduct in contemporary organizations. Authentic leadership, however, depends upon the ability to draw a distinction between the authentic and inauthentic leader. This ...... or her own value-commitments....

  1. Authentication Assurance Levels

    International Nuclear Information System (INIS)

    Kouzes, Richard T.; Cash, James R.; Devaney, David M.; Geelhood, Bruce D.; Hansen, Randy R.; Melton, Ronald B.; Pitts, W. Karl

    2002-01-01

    This Common Criteria approach has been applied to create a definition of Authentication Assurance Levels that can quantify the level of assurance reached for a system subject to a set of authentication procedures. The arms-control authentication application of the Common Criteria expands on more typical information security evaluations in that it must contend with information barriers and preclude sophisticated intentional subversion attempts.

  2. Ancient DNA analysis might suggest external origin of individuals from chamber graves placed in medieval cemetery in Pień, Central Poland.

    Science.gov (United States)

    Płoszaj, Tomasz; Jędrychowska-Dańska, Krystyna; Zamerska, Alicja; Drozd-Lipińska, Alicja; Poliński, Dariusz; Janowski, Andrzej; Witas, Henryk

    2017-12-01

    The participation of immigrants during early days in Poland of Piast's dynasty is a debated issue among archaeologists and anthropologists alike. Such hypotheses were formulated on the basis of, amongst others, the discovery of early medieval chamber graves characterized by construction features typical of the Scandinavian culture area. Archaeological and anthropological studies to date have not provided an unequivocal answer as to whether the individuals interred in those graves were autochthons who adopted a different burial rite, or perhaps immigrants from foreign lands. To characterize the gene pool of this population we analyzed the C/T allele of the nuclear gene LCT-13910 as well as fragments of the mitochondrial genome from individuals buried in very richly furnished chamber graves at the medieval cemetery in Pień. The obtained results for the nuclear allele and mtDNA do not corroborate the Scandinavian origin of the analyzed population. Moreover, we did not find haplogroup I, which is the one typical of populations that historically inhabited the north of Europe; and the frequency of the LCT-13910 T allele was similar to that of past and present Polish populations. On the other hand, we identified the atypical haplogroup C5c1, which suggests Asian origin of the studied individuals and confirms our previous reports concerning ancient human migrations from Asia to the territory of present-day Poland. While our findings do not conclusively disprove a Scandinavian lineage of the studied population, they certainly shed some new light on the origin of the individuals buried in chamber graves, which may be very different from the one initially proposed by archaeologists.

  3. The TL dating of ancient porcelain

    International Nuclear Information System (INIS)

    Leung, P.L.; Stokes, M.J.; Wang Weida; Xia Junding; Zhou Zhixin

    1997-01-01

    The age determination of ancient porcelain using the pre-dose technique in TL dating was reported. The variation of beta dose with depth below the surface of the porcelain slice, the thermal activation characteristic (TAC) for 110 degree C peak, the measurement of paleodose and the estimation of annual dose were studied. The results show that this technique is suitable for authenticity testing of ancient porcelain, but both accuracy and precision for porcelain dating are worse than those for pottery, because porcelain differs from pottery on composition, structure and firing temperature. Besides, some complicated factors in the pre-dose technique would be the possible cause of the greater errors

  4. [Real-time quantification to analyze historical Colombian samples detecting a short fragment of hypervariable region II of mitochondrial DNA].

    Science.gov (United States)

    Pérez, Luz Adriana; Rodríguez, Freddy; Langebaek, Carl Henrik; Groot, Helena

    2016-09-01

    Unlike other molecular biology studies, the analysis of ancient DNA (aDNA) requires special infrastructure and methodological conditions to guarantee the quality of the results. One of the main authenticity criteria is DNA quantification, where quantitative real-time PCR is often used given its sensitivity and specificity. Nevertheless, the implementation of these conditions and methodologies to fulfill authenticity criteria imply higher costs. Objective: To develop a simple and less costly method for mitochondrial DNA quantification suitable for highly degraded samples. Materials and methods: The proposed method is based on the use of mini-primers for the specific amplification of short fragments of mitochondrial DNA. The subsequent purification of these amplified fragments allows a standard curve to be constructed with concentrations in accordance to the state of degradation of the samples. Results: The proposed method successfully detected DNA from ancient samples including bone remains and mummified tissue. DNA inhibitory substances were also detected. Conclusion: The proposed method represents a simpler and cost-effective way to detect low amounts of aDNA, and a tool to differentiate DNA-free samples from samples with inhibitory substances.

  5. Multi-factor authentication

    Science.gov (United States)

    Hamlet, Jason R; Pierson, Lyndon G

    2014-10-21

    Detection and deterrence of spoofing of user authentication may be achieved by including a cryptographic fingerprint unit within a hardware device for authenticating a user of the hardware device. The cryptographic fingerprint unit includes an internal physically unclonable function ("PUF") circuit disposed in or on the hardware device, which generates a PUF value. Combining logic is coupled to receive the PUF value, combines the PUF value with one or more other authentication factors to generate a multi-factor authentication value. A key generator is coupled to generate a private key and a public key based on the multi-factor authentication value while a decryptor is coupled to receive an authentication challenge posed to the hardware device and encrypted with the public key and coupled to output a response to the authentication challenge decrypted with the private key.

  6. Ancient Egypt

    Science.gov (United States)

    Swamy, Ashwin Balegar

    This thesis involves development of an interactive GIS (Geographic Information System) based application, which gives information about the ancient history of Egypt. The astonishing architecture, the strange burial rituals and their civilization were some of the intriguing questions that motivated me towards developing this application. The application is a historical timeline starting from 3100 BC, leading up to 664 BC, focusing on the evolution of the Egyptian dynasties. The tool holds information regarding some of the famous monuments which were constructed during that era and also about the civilizations that co-existed. It also provides details about the religions followed by their kings. It also includes the languages spoken during those periods. The tool is developed using JAVA, a programing language and MOJO (Map Objects Java Objects) a product of ESRI (Environmental Science Research Institute) to create map objects, to provide geographic information. JAVA Swing is used for designing the user interface. HTML (Hyper Text Markup Language) pages are created to provide the user with more information related to the historic period. CSS (Cascade Style Sheets) and JAVA Scripts are used with HTML5 to achieve creative display of content. The tool is kept simple and easy for the user to interact with. The tool also includes pictures and videos for the user to get a feel of the historic period. The application is built to motivate people to know more about one of the prominent and ancient civilization of the Mediterranean world.

  7. Ancient genes of Saccharomyces cerevisiae.

    Science.gov (United States)

    Veiga-Crespo, P; Poza, M; Prieto-Alcedo, M; Villa, T G

    2004-07-01

    Amber is a plant resin mainly produced by coniferous trees that, after entrapping a variety of living beings, was subjected to a process of fossilization until it turned into yellowish, translucent stones. It is also one of the best sources of ancient DNA on which to perform studies on evolution. Here a method for the sterilization of amber that allows reliable ancient DNA extraction with no actual DNA contamination is described. Working with insects taken from amber, it was possible to amplify the ATP9, PGU1 and rRNA18S ancient genes of Saccharomyces cerevisiae corresponding to samples from the Miocene and Oligocene. After comparison of the current genes with their ancient (up to 35-40 million years) counterparts it was concluded that essential genes such as rRNA18S are highly conserved and that even normal 'house-keeping' genes, such as PGU1, are strikingly conserved along the millions of years that S. cerevisiae has evolved.

  8. Ancient Bedforms

    Science.gov (United States)

    2004-01-01

    18 August 2004 This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows groupings of large ripple-like windblown bedforms on the floor of a large crater (larger than the image shown here) in Sinus Sabaeus, south of Schiaparelli Basin. These ripple-like features are much larger than typical wind ripples on Earth, but smaller than typical sand dunes on either planet. Like most of the other ripple-like bedforms in Sinus Sabaeus, they are probably ancient and no longer mobile. Dark streaks on the substrate between the bedforms were formed by passing dust devils. This image is located near 13.0oS, 343.7oW. The image covers an area about 3 km (1.9 mi) across and sunlight illuminates the scene from the upper left.

  9. Temporal patterns of damage and decay kinetics of DNA retrieved from plant herbarium specimens.

    Science.gov (United States)

    Weiß, Clemens L; Schuenemann, Verena J; Devos, Jane; Shirsekar, Gautam; Reiter, Ella; Gould, Billie A; Stinchcombe, John R; Krause, Johannes; Burbano, Hernán A

    2016-06-01

    Herbaria archive a record of changes of worldwide plant biodiversity harbouring millions of specimens that contain DNA suitable for genome sequencing. To profit from this resource, it is fundamental to understand in detail the process of DNA degradation in herbarium specimens. We investigated patterns of DNA fragmentation and nucleotide misincorporation by analysing 86 herbarium samples spanning the last 300 years using Illumina shotgun sequencing. We found an exponential decay relationship between DNA fragmentation and time, and estimated a per nucleotide fragmentation rate of 1.66 × 10(-4) per year, which is six times faster than the rate estimated for ancient bones. Additionally, we found that strand breaks occur specially before purines, and that depurination-driven DNA breakage occurs constantly through time and can to a great extent explain decreasing fragment length over time. Similar to what has been found analysing ancient DNA from bones, we found a strong correlation between the deamination-driven accumulation of cytosine to thymine substitutions and time, which reinforces the importance of substitution patterns to authenticate the ancient/historical nature of DNA fragments. Accurate estimations of DNA degradation through time will allow informed decisions about laboratory and computational procedures to take advantage of the vast collection of worldwide herbarium specimens.

  10. Genetic diversity among ancient Nordic populations

    DEFF Research Database (Denmark)

    Melchior, Linea Cecilie; Lynnerup, Niels; Siegismund, Hans Redlef

    2010-01-01

    Using established criteria for work with fossil DNA we have analysed mitochondrial DNA from 92 individuals from 18 locations in Denmark ranging in time from the Mesolithic to the Medieval Age. Unequivocal assignment of mtDNA haplotypes was possible for 56 of the ancient individuals; however...... samples (4,200 YBP, Bell Beaker culture) that were typed were haplogroup U4 and U5a, respectively, and the single Bronze Age sample (3,300-3,500 YBP) was haplogroup U4. These two haplogroups have been associated with the Mesolithic populations of Central and Northern Europe. Therefore, at least...... the ancient Danes (average 13%) than among extant Danes and Scandinavians ( approximately 2.5%) as well as among other ancient population samples reported. Haplogroup I could therefore have been an ancient Southern Scandinavian type "diluted" by later immigration events. Interestingly, the two Neolithic...

  11. Authentication: Hot and cool

    OpenAIRE

    Cohen, E; Cohen, SA

    2012-01-01

    Seeking to shift the discussion of the concept of authenticity in tourism scholarship from the dominant concern with tourist experiences to the more sociological problem of the processes of authentication of tourist attractions, we conceptualize two analytically distinct, but practically often intersecting, modes of authentication of attractions, “cool” and “hot”. Through a range of examples, we demonstrate the implications of the two modes for the dynamics of the constitution of tourist attr...

  12. Analysis of mitochondrial DNA for authentication of meats from chamois (Rupicapra rupicapra), pyrenean ibex (Capra pyrenaica), and mouflon (Ovis ammon) by polymerase chain reaction-restriction fragment length polymorphism.

    Science.gov (United States)

    Fajardo, Violeta; González, Isabel; López-Calleja, Inés; Martin, Irene; Rojas, Maria; Pavón, Miguel Angel; Hernández, Pablo E; García, Teresa; Martín, Rosario

    2007-01-01

    The prevention of fraudulent labeling of game meat constitutes an important part of food regulatory control and quality assurance systems. A polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis based on mitochondrial deoxyribonucleic acid (DNA) was developed for authentication of meats from chamois (Rupicapra rupicapra), pyrenean ibex (Capra pyrenaica), and mouflon (Ovis ammon). Amplification and restriction site analysis of a DNA fragment about 720 base pairs (bp) from the mitochondrial 12S rRNA gene of all analyzed species permitted the selection of Msel and Apol endonucleases for meat speciation. The 12S rRNA restriction profiles obtained allowed the unequivocal identification of chamois, pyrenean ibex, and mouflon/sheep and their differentiation from meats of domestic species such as cattle, goat, and swine. The highly variable mitochondrial D-loop gene was also targeted to attempt discrimination between mouflon and sheep meats. A D-loop region (700-1000 bp) was amplified and sequenced in all game and domestic species analyzed, and a primer set was designed for the selective amplification of a 370 bp DNA fragment from mouflon and sheep. PCR-RFLP analysis with the selected Maell enzyme generated a single electrophoretic profile characteristic for sheep, whereas 3 different fragment patterns were obtained for mouflon meats. Consequently, the PCR-RFLP technique developed can be routinely applied in inspection programs in order to verify the correct labeling of game species.

  13. Towards an ethics of authentic practice.

    Science.gov (United States)

    Murray, Stuart J; Holmes, Dave; Perron, Amélie; Rail, Geneviève

    2008-10-01

    This essay asks how we might best elaborate an ethics of authentic practice. Will we be able to agree on a set of shared terms through which ethical practice will be understood? How will we define ethics and the subject's relation to authoritative structures of power and knowledge? We begin by further clarifying our critique of evidence-based medicine (EBM), reflecting on the intimate relation between theory and practice. We challenge the charge that our position amounts to no more than 'subjectivism' and 'antiauthoritarian' theory. We argue that an ethical practice ought to question the authority of EBM without falling into the trap of dogmatic antiauthoritarianism. In this, we take up the work of Hannah Arendt, who offers terms to help understand our difficult political relation to authority in an authentic ethical practice. We continue with a discussion of Michel Foucault's use of 'free speech' or parrhesia, which he adopts from Ancient Greek philosophy. Foucault demonstrates that authentic ethical practice demands that we 'speak truth to power.' We conclude with a consideration of recent biotechnologies, and suggest that these biomedical practices force us to re-evaluate our theoretical understanding of the ethical subject. We believe that we are at a crucial juncture: we must develop an ethics of authentic practice that will be commensurable with new and emergent biomedical subjectivities.

  14. Complete mitochondrial genome sequence of a Middle Pleistocene cave bear reconstructed from ultrashort DNA fragments.

    Science.gov (United States)

    Dabney, Jesse; Knapp, Michael; Glocke, Isabelle; Gansauge, Marie-Theres; Weihmann, Antje; Nickel, Birgit; Valdiosera, Cristina; García, Nuria; Pääbo, Svante; Arsuaga, Juan-Luis; Meyer, Matthias

    2013-09-24

    Although an inverse relationship is expected in ancient DNA samples between the number of surviving DNA fragments and their length, ancient DNA sequencing libraries are strikingly deficient in molecules shorter than 40 bp. We find that a loss of short molecules can occur during DNA extraction and present an improved silica-based extraction protocol that enables their efficient retrieval. In combination with single-stranded DNA library preparation, this method enabled us to reconstruct the mitochondrial genome sequence from a Middle Pleistocene cave bear (Ursus deningeri) bone excavated at Sima de los Huesos in the Sierra de Atapuerca, Spain. Phylogenetic reconstructions indicate that the U. deningeri sequence forms an early diverging sister lineage to all Western European Late Pleistocene cave bears. Our results prove that authentic ancient DNA can be preserved for hundreds of thousand years outside of permafrost. Moreover, the techniques presented enable the retrieval of phylogenetically informative sequences from samples in which virtually all DNA is diminished to fragments shorter than 50 bp.

  15. Authenticity at work

    NARCIS (Netherlands)

    van den Bosch, Ralph

    2016-01-01

    Authenticity at work, loosely defined as the degree to which an individual stays true to their core self, has impact on workers in the workplace. This thesis shows that authenticity at work can be measured with a reliable and valid instrument: the IAM Work. Furthermore, results of this thesis show

  16. AUTHENTICITY IN THE BLOGOSPHERE

    Directory of Open Access Journals (Sweden)

    Waclaw Branicki

    2010-01-01

    Full Text Available The primary purpose of this article is to answer the question of whether writing a blog defined as a personal diary can help to better understand himself. Self-awareness is a prerequisite for authentic existence. In the first part analyzed the concept of authenticity. Pointed out the relationship of authenticity to the categories of freedom, truth and responsibility. The second part presents the relationship between authentic existence and the process of self-disclosure, which may take place in the blogosphere. In the third part presents the question whether a writing blog affects the level authenticity of existence. It was recognized that a key element of this phenomenon is the sense of responsibility.

  17. Inferring Past Environments from Ancient Epigenomes.

    Science.gov (United States)

    Gokhman, David; Malul, Anat; Carmel, Liran

    2017-10-01

    Analyzing the conditions in which past individuals lived is key to understanding the environments and cultural transitions to which humans had to adapt. Here, we suggest a methodology to probe into past environments, using reconstructed premortem DNA methylation maps of ancient individuals. We review a large body of research showing that differential DNA methylation is associated with changes in various external and internal factors, and propose that loci whose DNA methylation level is environmentally responsive could serve as markers to infer about ancient daily life, diseases, nutrition, exposure to toxins, and more. We demonstrate this approach by showing that hunger-related DNA methylation changes are found in ancient hunter-gatherers. The strategy we present here opens a window to reconstruct previously inaccessible aspects of the lives of past individuals. © The Author 2017. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

  18. Finding the founder of Stockholm - A kinship study based on Y-chromosomal, autosomal and mitochondrial DNA

    DEFF Research Database (Denmark)

    Malmström, Helena; Vretemark, Maria; Tillmar, Andreas

    2012-01-01

    these conclusions, ultimately leading to the reopening and reexamination of the grave in 2002. Ancient DNA-analyses were performed to investigate if the relationship between the three individuals matched what we would expect if the individuals were Birger, Erik and Mechtild. We used pyrosequencing of Y......-chromosomal and autosomal SNPs and compared the results with haplogroup frequencies of modern Swedes to investigate paternal relations. Possible maternal kinship was investigated by deep FLX-sequencing of overlapping mtDNA amplicons. The authenticity of the sequences was examined using data from independent extractions...

  19. Targeted enrichment of ancient pathogens yielding the pPCP1 plasmid of Yersinia pestis from victims of the Black Death.

    Science.gov (United States)

    Schuenemann, Verena J; Bos, Kirsten; DeWitte, Sharon; Schmedes, Sarah; Jamieson, Joslyn; Mittnik, Alissa; Forrest, Stephen; Coombes, Brian K; Wood, James W; Earn, David J D; White, William; Krause, Johannes; Poinar, Hendrik N

    2011-09-20

    Although investigations of medieval plague victims have identified Yersinia pestis as the putative etiologic agent of the pandemic, methodological limitations have prevented large-scale genomic investigations to evaluate changes in the pathogen's virulence over time. We screened over 100 skeletal remains from Black Death victims of the East Smithfield mass burial site (1348-1350, London, England). Recent methods of DNA enrichment coupled with high-throughput DNA sequencing subsequently permitted reconstruction of ten full human mitochondrial genomes (16 kb each) and the full pPCP1 (9.6 kb) virulence-associated plasmid at high coverage. Comparisons of molecular damage profiles between endogenous human and Y. pestis DNA confirmed its authenticity as an ancient pathogen, thus representing the longest contiguous genomic sequence for an ancient pathogen to date. Comparison of our reconstructed plasmid against modern Y. pestis shows identity with several isolates matching the Medievalis biovar; however, our chromosomal sequences indicate the victims were infected with a Y. pestis variant that has not been previously reported. Our data reveal that the Black Death in medieval Europe was caused by a variant of Y. pestis that may no longer exist, and genetic data carried on its pPCP1 plasmid were not responsible for the purported epidemiological differences between ancient and modern forms of Y. pestis infections.

  20. Richard Peters and Valuing Authenticity

    Science.gov (United States)

    Degenhardt, M. A. B.

    2009-01-01

    Richard Peters has been praised for the authenticity of his philosophy, and inquiry into aspects of the development of his philosophy reveals a profound authenticity. Yet authenticity is something he seems not to favour. The apparent paradox is resolved by observing historical changes in the understanding of authenticity as an important value.…

  1. Authenticity and Constructivism in Education

    Science.gov (United States)

    Splitter, Laurance J.

    2009-01-01

    This paper examines the concept of authenticity and its relevance in education, from a philosophical perspective. Under the heading of educational authenticity (EA), I critique Fred Newmann's views on authentic pedagogy and intellectual work. I argue against the notion that authentic engagement is usefully analyzed in terms of a relationship…

  2. A Review Of Authentication Methods

    Directory of Open Access Journals (Sweden)

    Nilesh A. Lal

    2015-08-01

    Full Text Available Authentication is process of granting a user access to an information system. There are three main types of authentication mechanisms password entry smart card and biometric. Each authentication mechanism functions differently and has their strengths and weakness. In this paper we review different types of authentication mechanisms their vulnerabilities and recommend novel solutions.

  3. Authenticity in Anatomy Art.

    Science.gov (United States)

    Adkins, Jessica

    2017-01-12

    The aim of this paper is to observe the evolution and evaluate the 'realness' and authenticity in Anatomy Art, an art form I define as one which incorporates accurate anatomical representations of the human body with artistic expression. I examine the art of 17th century wax anatomical models, the preservations of Frederik Ruysch, and Gunther von Hagens' Body Worlds plastinates, giving consideration to authenticity of both body and art. I give extra consideration to the works of Body Worlds since the exhibit creator believes he has created anatomical specimens with more educational value and bodily authenticity than ever before. Ultimately, I argue that von Hagens fails to offer Anatomy Art 'real human bodies,' and that the lack of bodily authenticity of his plastinates results in his creations being less pedagogic than he claims.

  4. Authentic Material 2.

    Science.gov (United States)

    Beeching, Kate

    1982-01-01

    Discusses techniques for the exploitation of authentic material, with reference to the self-instruction manual, designed for highly literate, undergraduate students, which accompanies the BBC course "Allez France." (EKN)

  5. Ancient DNA sequences point to a large loss of mitochondrial genetic diversity in the saiga antelope (Saiga tatarica) since the Pleistocene

    DEFF Research Database (Denmark)

    Campos, Paula; Kristensen, Tommy; Orlando, Ludovic Antoine Alexandre

    2010-01-01

    of the Soviet Union, after which its populations were reduced by over 95%. We have analysed the mitochondrial control region sequence variation of 27 ancient and 38 modern specimens, to assay how the species' genetic diversity has changed since the Pleistocene. Phylogenetic analyses reveal the existence of two...... Bayesian Computation analyses show the observed data is more compatible with a drastic population size reduction (c. 66-77%) following either a demographic bottleneck in the course of the Holocene or late Pleistocene, or a geographic fragmentation (followed by local extinction of one subpopulation...

  6. Apps for Ancient Civilizations

    Science.gov (United States)

    Thompson, Stephanie

    2011-01-01

    This project incorporates technology and a historical emphasis on science drawn from ancient civilizations to promote a greater understanding of conceptual science. In the Apps for Ancient Civilizations project, students investigate an ancient culture to discover how people might have used science and math smartphone apps to make their lives…

  7. A comparative study of ancient environmental DNA to pollen and macrofossils from lake sediments reveals taxonomic overlap and additional plant taxa

    DEFF Research Database (Denmark)

    Pedersen, M.W.; Ginolhac, Aurélien; Orlando, Ludovic Antoine Alexandre

    2013-01-01

    -eight of thirty-nine samples from the core yielded putative DNA sequences. Using a multiple assignment strategy on the trnL g-h DNA barcode, consisting of two different phylogenetic and one sequence similarity assignment approaches, thirteen families of plants were identified, of which two (. Scrophulariaceae...

  8. Consumption of animal products and frauds: DNA-based methods for the investigation of authenticity and traceability in dairy and meat-derived products – a review

    Directory of Open Access Journals (Sweden)

    Ana Carolina da Silva Carvalho

    2015-09-01

    Full Text Available O aumento do poder de compra da população, especialmente em países emergentes como o Brasil, foi seguido pelo crescente consumo de carnes, leites e seus derivados, assim como pela maior exigência por padrões de qualidade destes produtos. Os diferentes tipos de fraude podem comprometer a qualidade e ferir os direitos do consumidor, sendo relevante a aplicação de métodos mais sensíveis e específicos para investigação da autenticidade de gêneros alimentícios de origem animal. A substituição total ou parcial de carne, leite ou derivados, de outra espécie animal que não a declarada no rótulo dos produtos, compromete a natureza e a qualidade destes produtos, prejudicando os direitos de escolha dos consumidores, que podem estar relacionados a recomendações médicas e nutricionais, ao valor econômico do produto ou sobre os hábitos e/ou restrições alimentares específicos de cada cultura. A identificação das espécies animais que deram origem aos produtos cárneos e lácteos e importante para a rastreabilidade dos alimentos. Embora matrizes alimentares tenham composição complexa e variável, técnicas biomoleculares têm sido cada vez mais utilizadas para a identificação de espécies animais, uma vez que tem sido demonstrada a confiabilidade, especificidade, rapidez e alta sensibilidade, mesmo quando utilizadas em amostras mistas. Esta revisão teve como objetivo apresentar os principais métodos moleculares que podem ser utilizados para a detecção da adulteração de espécies em derivados cárneos e lácteos, incluindo métodos já bem estabelecidos, tais como a reação em cadeia da polimerase (PCR, bem como as tecnologias mais avançadas, como a PCR em tempo real, os métodos de sequenciamento de DNA de ultima geração e o biochip de DNA ou DNA microarray. Esses métodos moleculares vêm sendo utilizados, com sucesso, na detecção e quantificação de DNA exógeno em amostras de alimentos, mesmo que este DNA esteja

  9. Authentication Without Secrets

    Energy Technology Data Exchange (ETDEWEB)

    Pierson, Lyndon G. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Robertson, Perry J. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2015-11-01

    This work examines a new approach to authentication, which is the most fundamental security primitive that underpins all cyber security protections. Current Internet authentication techniques require the protection of one or more secret keys along with the integrity protection of the algorithms/computations designed to prove possession of the secret without actually revealing it. Protecting a secret requires physical barriers or encryption with yet another secret key. The reason to strive for "Authentication without Secret Keys" is that protecting secrets (even small ones only kept in a small corner of a component or device) is much harder than protecting the integrity of information that is not secret. Promising methods are examined for authentication of components, data, programs, network transactions, and/or individuals. The successful development of authentication without secret keys will enable far more tractable system security engineering for high exposure, high consequence systems by eliminating the need for brittle protection mechanisms to protect secret keys (such as are now protected in smart cards, etc.). This paper is a re-release of SAND2009-7032 with new figures numerous edits.

  10. Authenticity in Employment Relations

    DEFF Research Database (Denmark)

    Tackney, Charles Thomas

    analysis should complement and support corporate social responsibility, management spirituality, authentic leadership / authentic follower, and other secular research by offering a research methods bridge between empirically grounded theology and secular studies, with the common goal of improving workplace...... of the concept in Western culture, philosophy, and management studies, Religious Society of Friends (Quaker) and Roman Catholic social teachings are investigated for positively correlative data to help develop the criterion variable. From the literature review of concept and historical data in both traditions......This research takes up the concept of authenticity as a criterion variable for theology of the workplace analysis, a domain which explores employment parameters in light of religious teaching on the social question at national, organizational or firm-specific levels. Following a review...

  11. Authenticity in Employment Relations

    DEFF Research Database (Denmark)

    Tackney, Charles Thomas

    2018-01-01

    Authenticity is developed and deployed as a criterion variable for a theology of the workplace inquiry that combines theory and methodological development with data analysis. The goal is to show that social science method can offer an empirically valid, prophetic dimension to the study of employm......Authenticity is developed and deployed as a criterion variable for a theology of the workplace inquiry that combines theory and methodological development with data analysis. The goal is to show that social science method can offer an empirically valid, prophetic dimension to the study...... of employment and work parameters in light of religious teachings on the social question at national, organizational, or firm-specific levels. The function of a criterion variable is described, noting that the switch from a dependent variable approach introduces an open-system dynamism to social science...... theology and allied fields for the common cause of assessing authenticity in firm, organization, and higher system functions....

  12. Authenticity in Employment Relations

    DEFF Research Database (Denmark)

    Tackney, Charles Thomas

    analysis should complement and support corporate social responsibility, management spirituality, authentic leadership / authentic follower, and other secular research by offering a research methods bridge between empirically grounded theology and secular studies, with the common goal of improving workplace......This research takes up the concept of authenticity as a criterion variable for theology of the workplace analysis, a domain which explores employment parameters in light of religious teaching on the social question at national, organizational or firm-specific levels. Following a review...... of the concept in Western culture, philosophy, and management studies, Religious Society of Friends (Quaker) and Roman Catholic social teachings are investigated for positively correlative data to help develop the criterion variable. From the literature review of concept and historical data in both traditions...

  13. Brand new authentic places

    DEFF Research Database (Denmark)

    Stender, Marie

    created and transformed by architects and designers, estate agents and, eventually, residents? Based on ethnographic fieldwork in 3-4 new residential neighbourhoods in the Copenhagen Region, the project will investigate how stories of authenticity give places meaning and identity. The project will unfold...... neighbourhoods stories of authenticity seems to be of great importance giving value and identity to place and people. By way of design and branding new places are implied with notions of the real, the original and the unique referring to e.g. its historical past, architectural uniqueness, sustainability or sense...

  14. Two-factor authentication

    CERN Document Server

    Stanislav, Mark

    2015-01-01

    During the book, readers will learn about the various technical methods by which two-factor authentication is implemented, security concerns with each type of implementation, and contextual details to frame why and when these technologies should be used. Readers will also be provided with insight about the reasons that two-factor authentication is a critical security control, events in history that have been important to prove why organization and individual would want to use two factor, and core milestones in the progress of growing the market.

  15. A comparative study of ancient sedimentary DNA, pollen and macrofossils from permafrost sediments of northern Siberia reveals long-term vegetational stability

    DEFF Research Database (Denmark)

    Jørgensen, Tina; Haile, James Seymour; Möller, Per

    2012-01-01

    approach. SedaDNA and macrofossils share greater overlap in plant identifications than with pollen, suggesting that sedaDNA is local in origin. These two proxies also permit identification to lower taxonomic levels than pollen, enabling investigation into temporal changes in species composition...... and the determination of indicator species to describe environmental changes. Combining data from all three proxies reveals an area continually dominated by a mosaic vegetation of tundra-steppe, pioneer and wet-indicator plants. Such vegetational stability is unexpected, given the severe climate changes taking place...

  16. Topic Map for Authentic Travel

    OpenAIRE

    Wandsvik, Atle; Zare, Mehdi

    2007-01-01

    E-business is a new trend in Internet use. Authentic travel is an approach to travel and travel business which helps the traveler experience what is authentic in the travel destination. But how can the traveler find those small authentic spots and organize them together to compose a vacation? E-business techniques, combined withTopic Maps, can help.

  17. The early colonial atlantic world: New insights on the African Diaspora from isotopic and ancient DNA analyses of a multiethnic 15th-17th century burial population from the Canary Islands, Spain.

    Science.gov (United States)

    Santana, Jonathan; Fregel, Rosa; Lightfoot, Emma; Morales, Jacob; Alamón, Martha; Guillén, José; Moreno, Marco; Rodríguez, Amelia

    2016-02-01

    The Canary Islands are considered one of the first places where Atlantic slave plantations with labourers of African origin were established, during the 15th century AD. In Gran Canaria (Canary Islands, Spain), a unique cemetery dated to the 15th and 17th centuries was discovered adjacent to an ancient sugar plantation with funerary practices that could be related to enslaved people. In this article, we investigate the origin and possible birthplace of each individual buried in this cemetery, as well as the identity and social status of these people. The sample consists of 14 individuals radiocarbon dated to the 15th and 17th centuries AD. We have employed several methods, including the analysis of ancient human DNA, stable isotopes, and skeletal markers of physical activity. 1) the funerary practices indicate a set of rituals not previously recorded in the Canary Islands; 2) genetic data show that some people buried in the cemetery could have North-African and sub-Saharan African lineages; 3) isotopic results suggest that some individuals were born outside Gran Canaria; and 4) markers of physical activity show a pattern of labour involving high levels of effort. This set of evidence, along with information from historical sources, suggests that Finca Clavijo was a cemetery for a multiethnic marginalized population that had being likely enslaved. Results also indicate that this population kept practicing non-Christian rituals well into the 17th century. We propose that this was possible because the location of the Canaries, far from mainland Spain and the control of the Spanish Crown, allowed the emergence of a new society with multicultural origins that was more tolerant to foreign rituals and syncretism. © 2015 Wiley Periodicals, Inc.

  18. Tools for Authentication

    Energy Technology Data Exchange (ETDEWEB)

    White, G

    2008-07-09

    Many recent Non-proliferation and Arms Control software projects include a software authentication component. In this context, 'authentication' is defined as determining that a software package performs only its intended purpose and performs that purpose correctly and reliably over many years. In addition to visual inspection by knowledgeable computer scientists, automated tools are needed to highlight suspicious code constructs both to aid the visual inspection and to guide program development. While many commercial tools are available for portions of the authentication task, they are proprietary, and have limited extensibility. An open-source, extensible tool can be customized to the unique needs of each project (projects can have both common and custom rules to detect flaws and security holes). Any such extensible tool must be based on a complete language compiler infrastructure, that is, one that can parse and digest the full language through its standard grammar. ROSE is precisely such a compiler infrastructure developed within DOE. ROSE is a robust source-to-source analysis and optimization infrastructure currently addressing large, million-line DOE applications in C, C++, and FORTRAN. This year, it has been extended to support the automated analysis of binaries. We continue to extend ROSE to address a number of security-specific requirements and apply it to software authentication for Non-proliferation and Arms Control projects. We will give an update on the status of our work.

  19. Authentication of Hadith

    African Journals Online (AJOL)

    OYELAKIN

    the side of one of the narrators. Hadith forgery featured in Islam barely two decades after the prophet and scholars did their best to differentiate it from authentic ones. Despite this, for Khan, it is possible that some traditions regarded as genuine merely due to their isnad may not be genuine in textual outlook. Since the isnad ...

  20. [Application of rapid PCR to authenticate medicinal snakes].

    Science.gov (United States)

    Chen, Kang; Jiang, Chao; Yuan, Yuan; Huang, Lu-Qi; Li, Man

    2014-10-01

    To obtained an accurate, rapid and efficient method for authenticate medicinal snakes listed in Chinese Pharmacopoeia (Zaocysd humnades, Bungarus multicinctus, Agkistrodon acutus), a rapid PCR method for authenticate snakes and its adulterants was established based on the classic molecular authentication methods. DNA was extracted by alkaline lysis and the specific primers were amplified by two-steps PCR amplification method. The denatured and annealing temperature and cycle numbers were optimized. When 100 x SYBR Green I was added in the PCR product, strong green fluorescence was visualized under 365 nm UV whereas adulterants without. The whole process can complete in 30-45 minutes. The established method provides the technical support for authentication of the snakes on field.

  1. Ancient DNA Analysis of Mid-Holocene Individuals from the Northwest Coast of North America Reveals Different Evolutionary Paths for Mitogenomes

    Science.gov (United States)

    Cui, Yinqiu; Lindo, John; Hughes, Cris E.; Johnson, Jesse W.; Hernandez, Alvaro G.; Kemp, Brian M.; Ma, Jian; Cunningham, Ryan; Petzelt, Barbara; Mitchell, Joycellyn; Archer, David; Cybulski, Jerome S.; Malhi, Ripan S.

    2013-01-01

    To gain a better understanding of North American population history, complete mitochondrial genomes (mitogenomes) were generated from four ancient and three living individuals of the northern Northwest Coast of North America, specifically the north coast of British Columbia, Canada, current home to the indigenous Tsimshian, Haida, and Nisga’a. The mitogenomes of all individuals were previously unknown and assigned to new sub-haplogroup designations D4h3a7, A2ag and A2ah. The analysis of mitogenomes allows for more detailed analyses of presumed ancestor–descendant relationships than sequencing only the HVSI region of the mitochondrial genome, a more traditional approach in local population studies. The results of this study provide contrasting examples of the evolution of Native American mitogenomes. Those belonging to sub-haplogroups A2ag and A2ah exhibit temporal continuity in this region for 5000 years up until the present day. Of possible associative significance is that archaeologically identified house structures in this region maintain similar characteristics for this same period of time, demonstrating cultural continuity in residence patterns. The individual dated to 6000 years before present (BP) exhibited a mitogenome belonging to sub-haplogroup D4h3a. This sub-haplogroup was earlier identified in the same general area at 10300 years BP on Prince of Wales Island, Alaska, and may have gone extinct, as it has not been observed in any living individuals of the Northwest Coast. The presented case studies demonstrate the different evolutionary paths of mitogenomes over time on the Northwest Coast. PMID:23843972

  2. Authentic feminist? Authenticity and feminist identity in teenage feminists' talk.

    Science.gov (United States)

    Calder-Dawe, Octavia; Gavey, Nicola

    2017-12-01

    This article explores how young people's feminist identities take shape in conjunction with a contemporary ideal of personal authenticity: to know and to express the 'real me'. Drawing from interviews with 18 teenagers living in Auckland, New Zealand, we examine a novel convergence of authenticity and feminism in participants' identity talk. For social psychologists interested in identity and politics, this convergence is intriguing: individualizing values such as authenticity are generally associated with disengagement with structural critique and with a repudiation of politicized and activist identities. Rather than seeking to categorize authentic feminism as an instance of either 'good/collective' or 'bad/individualized' feminist politics, we use discourse analysis to examine how the identity position of authentic feminist was constructed and to explore implications for feminist politics. On one hand, interviewees mobilized authentic feminism to affirm their commitment to normative liberal values of authenticity and self-expression. At the same time, the position of authentic feminist appeared to authorize risky feminist identifications and to justify counter-normative feelings, desires, and actions. To conclude, we explore how encountering others' intolerance of authentic feminism exposed interviewees to the limits of authenticity discourse, propelling some towards new understandings of the social world and their space for action within it. © 2017 The British Psychological Society.

  3. Studying Ancient History.

    Science.gov (United States)

    Barrow, Robin

    1982-01-01

    Defends the value and relevance of the study of ancient history and classics in history curricula. The unique homogeneity of the classical period contributes to its instructional manageability. A year-long, secondary-level course on fifth-century Greece and Rome is described to illustrate effective approaches to teaching ancient history. (AM)

  4. Ancient Astronomy in Armenia

    Science.gov (United States)

    Parsamian, Elma S.

    2007-08-01

    The most important discovery, which enriched our knowledge of ancient astronomy in Armenia, was the complex of platforms for astronomical observations on the Small Hill of Metzamor, which may be called an ancient “observatory”. Investigations on that Hill show that the ancient inhabitants of the Armenian Highlands have left us not only pictures of celestial bodies, but a very ancient complex of platforms for observing the sky. Among the ancient monuments in Armenia there is a megalithic monument, probably, being connected with astronomy. 250km South-East of Yerevan there is a structure Zorats Kar (Karahunge) dating back to II millennium B.C. Vertical megaliths many of which are more than two meters high form stone rings resembling ancient stone monuments - henges in Great Britain and Brittany. Medieval observations of comets and novas by data in ancient Armenian manuscripts are found. In the collection of ancient Armenian manuscripts (Matenadaran) in Yerevan there are many manuscripts with information about observations of astronomical events as: solar and lunar eclipses, comets and novas, bolides and meteorites etc. in medieval Armenia.

  5. Medicine in Ancient Assur

    DEFF Research Database (Denmark)

    Arbøll, Troels Pank

    This dissertation is a microhistorical study of a single individual named Kiṣir-Aššur who practiced medicine in the ancient city of Assur (modern northern Iraq) in the 7th century BCE. The study provides the first detailed analysis of one healer’s education and practice in ancient Mesopotamia...

  6. PhytoAuthent: Molecular authentication of complex herbal food supplements for safety and efficacy

    Directory of Open Access Journals (Sweden)

    Mihael Ichim

    2017-10-01

    Full Text Available The PhytoAuthent project was structured to gather, test, develop and apply, in real life case scenarios, molecular techniques, such as biochemical fingerprinting and DNA sequence-based methods, for plant identification of constituents in complex herbal products. The project had a strong focus on applied aspects like protecting consumers from health risks associated with product substitution and contamination of herbal products.

  7. Anonymous Authentication for Smartcards

    Directory of Open Access Journals (Sweden)

    J. Hajny

    2010-06-01

    Full Text Available The paper presents an innovative solution in the field of RFID (Radio-Frequency IDentification smartcard authentication. Currently the smartcards are used for many purposes - e.g. employee identification, library cards, student cards or even identity credentials. Personal identity is revealed to untrustworthy entities every time we use these cards. Such information could later be used without our knowledge and for harmful reasons like shopping pattern scanning or even movement tracking. We present a communication scheme for keeping one’s identity private in this paper. Although our system provides anonymity, it does not allow users to abuse this feature. The system is based on strong cryptographic primitives that provide features never available before. Besides theoretical design of the anonymous authentication scheme and its analysis we also provide implementation results.

  8. FPGA Authentication Methods.

    Energy Technology Data Exchange (ETDEWEB)

    Brotz, Jay Kristoffer [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Hymel, Ross W [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Punnoose, Ratish J. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Mannos, Tom [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Grant, Neil [Atomic Weapons Establishment (AWE), Berkshire (United Kingdom); Evans, Neil [Atomic Weapons Establishment (AWE), Berkshire (United Kingdom)

    2017-05-01

    One of the greatest challenges facing designers of equipment to be used in a nuclear arms control treaty is how to convince the other party in the treaty to trust its results and functionality. Whether the host provides equipment meant to prove treaty obligations and the inspector needs to gain that trust (commonly referred to as authentication), or the inspector provides this equipment and the host needs to gain this trust (commonly considered to be included in certification), one party generally has higher confidence in the equipment at the start of a treaty regime and the other party needs to gain that confidence prior to use. While we focus on authentication in this document—that is, the inspector gaining confidence in host-provided equipment—our conclusions will likely apply to host certification of inspector-provided equipment.

  9. An ancient satellite DNA has maintained repetitive units of the original structure in most species of the living fossil plant genus Zamia.

    Science.gov (United States)

    Cafasso, Donata; Chinali, Gianni

    2014-03-01

    ZpS1 satellite DNA is specific to the genus Zamia and presents repetitive units organized as long arrays and also as very short arrays dispersed in the genome. We have characterized the structure of the ZpS1 repeats in 12 species representative of the whole geographic distribution of the genus. In most species, the clone most common sequences (cMCS) were so similar that a general most common sequence (GMCS) of the ZpS1 repetitive unit in the genus could be obtained. The few partial variations from the GMCS found in cMCS of some species correspond to variable positions present in most other species, as indicated by the clone consensus sequences (cCS). Two species have an additional species-specific variety of ZpS1 satellite. The dispersed repeats were found to contain more mutations than repeats from long arrays. Our results indicate that all or most species of Zamia inherited the ZpS1 satellite from a common ancestor in Miocene and have maintained repetitive units of the original structure till present. The features of ZpS1 satellite in the genus Zamia are poorly compatible with the model of concerted evolution, but they are perfectly consistent with a new model of satellite evolution based on experimental evidences indicating that a specific amplification-substitution repair mechanism maintains the homogeneity and stability of the repeats structure in each satellite DNA originally present in a species as long as the species exists.

  10. International safeguards data authentication

    Energy Technology Data Exchange (ETDEWEB)

    Melton, R.B.; Smith, C.E.; DeLand, S.M.; Manatt, D.R.

    1996-07-01

    The International Safeguards community is becoming increasingly reliant on information stored in electronic form. In international monitoring and related activities it must be possible to verify and maintain the integrity of this electronic information. This paper discusses the use of data authentication technology to assist in accomplishing this task. The paper provides background information, identifies the relevance to international safeguards, discusses issues related to export controls, algorithm patents, key management and the use of commercial vs. custom software.

  11. Ancient DNA unravels the truth behind the controversial GUS Greenlandic Norse fur samples: the bison was a horse, and the muskox and beats were goats

    DEFF Research Database (Denmark)

    Sinding, Mikkel-Holger; Arneborg, Jette; Nyegaard, Georg

    2015-01-01

    The Norse Greenlandic archaeological site known as ‘the Farm Beneath the Sand’ (GUS) has sourced many well-preserved and unique archaeological artefacts. Some of the most controversial finds are tufts of hair, which previous morphological-based examination concluded derive from bison, black bear......, brown bear and muskox, all species whose natural presence in South Greenland is unlikely. If true, the consequences are potentially significant, as they could imply Viking trading with, or hunting within, North America. To validate these previous findings, we genetically profiled the samples, through...... mitochondrial 16S DNA analysis. The results revealed that the putative bison was, in fact horse, while the bears and muskox were goat. The results demonstrate the importance of using genetic analyses to validate results derived from morphological analyses on hair, in particular where such studies lead...

  12. k-Times Anonymous Authentication

    Science.gov (United States)

    Teranishi, Isamu; Furukawa, Jun; Sako, Kazue

    We propose an authentication scheme in which users can be authenticated anonymously so long as times that they are authenticated is within an allowable number. The proposed scheme has two features: 1) no one, not even an authority, can identify users who have been authenticated within the allowable number, 2) anyone can trace, without help from the authority, dishonest users who have been authenticated beyond the allowable number by using the records of these authentications. Our scheme can be applied to e-voting, e-cash, electronic coupons, and trial browsing of content. In these applications, our scheme, unlike the previous one, conceals users' participation from protocols and guarantees that they will remain anonymous to everyone.

  13. Persistent Authentication in Smart Environments

    DEFF Research Database (Denmark)

    Hansen, Mads Syska; Kirschmeyer, Martin; Jensen, Christian D.

    2008-01-01

    Inhabitants in smart environments are often authenticated when they enter the smart environment, e.g., through biometrics or smart-/swipe-card systems. It may sometimes be necessary to re-authenticate when an inhabitant wishes to enter a restricted area or access ambient services or location based...... information, e.g., it is common to have swipe card terminals placed next to doors to restricted areas. This means that all access to protected resources must have individual means of authenticating users, which makes the access control system more expensive and less flexible, because access controls...... will not be installed unless it is absolutely necessary. The cost of installing and maintaining an authentication infrastructure and the inconvenience of repeatedly authenticating toward different location based service providers mean that new models of authentication are needed in smart environments. This paper...

  14. Art Activities about Mesopotamia, Egypt and Islam. Hands-On Ancient People.

    Science.gov (United States)

    Merrill, Yvonne Y.

    This book features objects of the Mesopotamian, the Egyptian, and Islamic cultures. In exploring important contributions in ancient art, the book presents visuals that are interpretations of authentic artifacts, usually in museum collections, or illustrations from archaeological publications and articles. Historical items (n=55+) have been adapted…

  15. Application of analytical methods in authentication and adulteration of honey.

    Science.gov (United States)

    Siddiqui, Amna Jabbar; Musharraf, Syed Ghulam; Choudhary, M Iqbal; Rahman, Atta-Ur-

    2017-02-15

    Honey is synthesized from flower nectar and it is famous for its tremendous therapeutic potential since ancient times. Many factors influence the basic properties of honey including the nectar-providing plant species, bee species, geographic area, and harvesting conditions. Quality and composition of honey is also affected by many other factors, such as overfeeding of bees with sucrose, harvesting prior to maturity, and adulteration with sugar syrups. Due to the complex nature of honey, it is often challenging to authenticate the purity and quality by using common methods such as physicochemical parameters and more specialized procedures need to be developed. This article reviews the literature (between 2000 and 2016) on the use of analytical techniques, mainly NMR spectroscopy, for authentication of honey, its botanical and geographical origin, and adulteration by sugar syrups. NMR is a powerful technique and can be used as a fingerprinting technique to compare various samples. Copyright © 2016 Elsevier Ltd. All rights reserved.

  16. Authentic, Original, and Valuable

    DEFF Research Database (Denmark)

    Tupasela, Aaro Mikael; Tamminen, Sakari

    2015-01-01

    The idea of genetic authenticity and origin has been an important issue within genetics for decades for scientific, political, and economic reasons. The question of where species and populations come from, as well as the linking of genetic traits to particular geographical locations, has resurfaced....... Using the case of human and non-human genetics to compare and contrast the various facets associated with genetic identity, we seek to develop a broader picture of the ways in which genetics plays an important role in stabilizing categories of origin....

  17. Authenticity and its Contemporary Challenges

    DEFF Research Database (Denmark)

    Petersen, Franziska Bork

    2013-01-01

    In this thesis I investigate what 'authenticity' means in a contemporary popular context and how it is used in the staging of bodies. Furthermore, I analyse works of dance and fashion from the past fifteen years with a focus on their strategies of challenging the notion of 'bodily authenticity'. ...

  18. Authenticity, Culture and Language Learning

    Science.gov (United States)

    MacDonald, Malcolm N.; Badger, Richard; Dasli, Maria

    2006-01-01

    In philosophy, authenticity has been used with two meanings: one entails the notion of correspondence; the other entails the notion of genesis (Cooper, 1983: 15). As in certain branches of philosophy, language teaching has perhaps clung too long to the first of these notions of authenticity at the expense of the other. This paper reviews four key…

  19. A 28,000 years old Cro-Magnon mtDNA sequence differs from all potentially contaminating modern sequences.

    Directory of Open Access Journals (Sweden)

    David Caramelli

    Full Text Available BACKGROUND: DNA sequences from ancient specimens may in fact result from undetected contamination of the ancient specimens by modern DNA, and the problem is particularly challenging in studies of human fossils. Doubts on the authenticity of the available sequences have so far hampered genetic comparisons between anatomically archaic (Neandertal and early modern (Cro-Magnoid Europeans. METHODOLOGY/PRINCIPAL FINDINGS: We typed the mitochondrial DNA (mtDNA hypervariable region I in a 28,000 years old Cro-Magnoid individual from the Paglicci cave, in Italy (Paglicci 23 and in all the people who had contact with the sample since its discovery in 2003. The Paglicci 23 sequence, determined through the analysis of 152 clones, is the Cambridge reference sequence, and cannot possibly reflect contamination because it differs from all potentially contaminating modern sequences. CONCLUSIONS/SIGNIFICANCE: The Paglicci 23 individual carried a mtDNA sequence that is still common in Europe, and which radically differs from those of the almost contemporary Neandertals, demonstrating a genealogical continuity across 28,000 years, from Cro-Magnoid to modern Europeans. Because all potential sources of modern DNA contamination are known, the Paglicci 23 sample will offer a unique opportunity to get insight for the first time into the nuclear genes of early modern Europeans.

  20. Resurrecting ancient animal genomes: the extinct moa and more.

    Science.gov (United States)

    Huynen, Leon; Millar, Craig D; Lambert, David M

    2012-08-01

    Recently two developments have had a major impact on the field of ancient DNA (aDNA). First, new advances in DNA sequencing, in combination with improved capture/enrichment methods, have resulted in the recovery of orders of magnitude more DNA sequence data from ancient animals. Second, there has been an increase in the range of tissue types employed in aDNA. Hair in particular has proven to be very successful as a source of DNA because of its low levels of contamination and high level of ancient endogenous DNA. These developments have resulted in significant advances in our understanding of recently extinct animals: namely their evolutionary relationships, physiology, and even behaviour. Hair has been used to recover the first complete ancient nuclear genome, that of the extinct woolly mammoth, which then facilitated the expression and functional analysis of haemoglobins. Finally, we speculate on the consequences of these developments for the possibility of recreating extinct animals. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  1. Reading Authentic Texts

    DEFF Research Database (Denmark)

    Balling, Laura Winther

    2013-01-01

    Most research on cognates has focused on words presented in isolation that are easily defined as cognate between L1 and L2. In contrast, this study investigates what counts as cognate in authentic texts and how such cognates are read. Participants with L1 Danish read news articles in their highly...... proficient L2, English, while their eye-movements were monitored. The experiment shows a cognate advantage for morphologically simple words, but only when cognateness is defined relative to translation equivalents that are appropriate in the context. For morphologically complex words, a cognate disadvantage...... is observed which may be due to problems of integrating cognate with non-cognate morphemes. The results show that fast non-selective access to the bilingual lexicon is conditioned by the communicative context. Importantly, a range of variables are statistically controlled in the regression analyses, including...

  2. Dentistry in ancient mesopotamia.

    Science.gov (United States)

    Neiburger, E J

    2000-01-01

    Sumer, an empire in ancient Mesopotamia (southern Iraq), is well known as the cradle of our modern civilization and the home of biblical Abraham. An analysis of skeletal remains from cemeteries at the ancient cities of Ur and Kish (circa 2000 B.C.), show a genetically homogeneous, diseased, and short-lived population. These ancient Mesopotamians suffered severe dental attrition (95 percent), periodontal disease (42 percent), and caries (2 percent). Many oral congenital and neoplastic lesions were noted. During this period, the "local dentists" knew only a few modern dental techniques. Skeletal (dental) evidence indicates that the population suffered from chronic malnutrition. Malnutrition was probably caused by famine, which is substantiated in historic cuneiform and biblical writings, geologic strata samples, and analysis of skeletal and forensic dental pathology. These people had modern dentition but relatively poor dental health. The population's lack of malocclusions, caries, and TMJ problems appear to be due to flat plane occlusion.

  3. AUTHENTIC LEADERSHIP IN EDUCATIONAL INSTITUTIONS

    Directory of Open Access Journals (Sweden)

    Nebojsa Pavlovic

    2015-06-01

    Full Text Available This work investigates authentic leadership models in the organizational culture of a school. The aim of this quantitative research is to define the factors of authentic leadership in educational institutions in order to provide answers to the questions related to the existence of specific authentic leadership in a school. The sample included 227 randomly selected directors of secondary and primary schools in the former Yugoslav republics: Serbia, Montenegro, and the Republic Srpska. The research included the use of an ALQ questionnaire for the estimation of leadership behavior. The components of authentic leadership are defined using factor analysis and other statistics techniques. The findings developed in this research indicated the fact that directors in educational institutions have a specific authentic leadership style. We suggest the concept of authentic leadership based on the four following factors: Communication-conformist, self-consciousness, self-discovery, and self-concept. Supporting these factors provides the directors with the possibility of obtaining a high level of authentic leadership.

  4. DNA Chip

    Indian Academy of Sciences (India)

    Imagine a world without identity cards; no I-cards for the college or office or bank account or anything! All you are carrying is a small (say, 2cm x 2cm) 'DNA-chip', which has the whole of your genetic profile on it. Your identity cannot get more authentic than that. Imagine a world where marriages are not decided by matching ...

  5. Authenticity in CALL: Three Domains of "Realness"

    Science.gov (United States)

    Buendgens-Kosten, Judith

    2013-01-01

    This paper discusses the role of authenticity and authenticity claims in computer assisted language learning (CALL). It considers authenticity as the result of a social negotiation process rather than an innate feature of a text, object, person, or activity. From this basis, it argues that authenticity claims play an important role in both second…

  6. Authentic leadership: application to women leaders

    Science.gov (United States)

    Hopkins, Margaret M.; O’Neil, Deborah A.

    2015-01-01

    The purpose of this perspective article is to present the argument that authentic leadership is a gendered representation of leadership. We first provide a brief history of leadership theories and definitions of authentic leadership. We then critique authentic leadership and offer arguments to support the premise that authentic leadership is not gender-neutral and is especially challenging for women. PMID:26236254

  7. Physical trust-based persistent authentication

    DEFF Research Database (Denmark)

    Fujita, Masahiro; Jensen, Christian D.; Arimura, Shiori

    2015-01-01

    Recently companies have applied two-factor user authentication. Persistent Authentication is one of the interesting authentication mechanisms to establish security and usability of two-factor authentication systems. However, there is room to improve its feasibility and usability. In this paper, we...... propose a new type of persistent authentication, called Persistent Authentication Based On physical Trust (PABOT). PABOT uses a context of “physical trust relationship” that is built by visual contact between users, and thus can offer a persistent authentication mechanism with better usability and higher...

  8. Ancient Chinese Precedents in China

    National Research Council Canada - National Science Library

    Geddis, Robert

    1999-01-01

    ... classics from ancient china. The assumption is that since China's political and military leaders state openly that their strategy is based on traditional Chinese strategic concepts, a study of ancient classics on strategy...

  9. Mathematics in Ancient India

    Indian Academy of Sciences (India)

    In this series of articles, we intend to have a glimpse of some of the landmarks in ancient In- dian mathematics with special emphasis on num- ber theory. This issue features a brief overview of some of the high peaks of mathematics in an- cient India. In the next part we shall describe. Aryabhata's general solution in integers ...

  10. Printing Ancient Terracotta Warriors

    Science.gov (United States)

    Gadecki, Victoria L.

    2010-01-01

    Standing in awe in Xian, China, at the Terra Cotta warrior archaeological site, the author thought of sharing this experience and excitement with her sixth-grade students. She decided to let her students carve patterns of the ancient soldiers to understand their place in Chinese history. They would make block prints and print multiple soldiers on…

  11. Trepanation in Ancient China.

    Science.gov (United States)

    Hobert, Leah; Binello, Emanuela

    2017-05-01

    Trepanation, the process of making a burr hole in the skull to access the brain, is an ancient form of a primitive craniotomy. There is widespread evidence of contributions made to this practice by ancient civilizations in Europe, Africa, and South America, where archaeologists have unearthed thousands of trepanned skulls dating back to the Neolithic period. Little is known about trepanation in China, and it is commonly believed that the Chinese used only traditional Chinese medicine and nonsurgical methods for treating brain injuries. However, a thorough analysis of the available archeological and literary evidence reveals that trepanation was widely practiced throughout China thousands of years ago. A significant number of trepanned Chinese skulls have been unearthed showing signs of healing and suggesting that patients survived after surgery. Trepanation was likely performed for therapeutic and spiritual reasons. Medical and historical works from Chinese literature contain descriptions of primitive neurosurgical procedures, including stories of surgeons, such as the legendary Hua Tuo, and surgical techniques used for the treatment of brain pathologies. The lack of translation of Chinese reports into the English language and the lack of publications on this topic in the English language may have contributed to the misconception that ancient China was devoid of trepanation. This article summarizes the available evidence attesting to the performance of successful primitive cranial surgery in ancient China. Copyright © 2016 Elsevier Inc. All rights reserved.

  12. Ancient Egypt: History 380.

    Science.gov (United States)

    Turk, Laraine D.

    "Ancient Egypt," an upper-division, non-required history course covering Egypt from pre-dynastic time through the Roman domination is described. General descriptive information is presented first, including the method of grading, expectation of student success rate, long-range course objectives, procedures for revising the course, major…

  13. Ancient Egypt: Personal Perspectives.

    Science.gov (United States)

    Wolinski, Arelene

    This teacher resource book provides information on ancient Egypt via short essays, photographs, maps, charts, and drawings. Egyptian social and religious life, including writing, art, architecture, and even the practice of mummification, is conveniently summarized for the teacher or other practitioner in a series of one to three page articles with…

  14. Mathematics in Ancient India

    Indian Academy of Sciences (India)

    Number Theory for its own sake, as a great 'intellectual challenge, has a long history, particularly here in India. Already in the 7th century, Brahmagupta made impor- tant contributions to what is now known (incorrectly) as. Pell's equation.: Michael Atiyah ([1], p.913). In number theory, the grandest achievements of ancient.

  15. Ancient deforestation revisited.

    Science.gov (United States)

    Hughes, J Donald

    2011-01-01

    The image of the classical Mediterranean environment of the Greeks and Romans had a formative influence on the art, literature, and historical perception of modern Europe and America. How closely does is this image congruent with the ancient environment as it in reality existed? In particular, how forested was the ancient Mediterranean world, was there deforestation, and if so, what were its effects? The consensus of historians, geographers, and other scholars from the mid-nineteenth century through the first three quarters of the twentieth century was that human activities had depleted the forests to a major extent and caused severe erosion. My research confirmed this general picture. Since then, revisionist historians have questioned these conclusions, maintaining instead that little environmental damage was done to forests and soils in ancient Greco-Roman times. In a reconsideration of the question, this paper looks at recent scientific work providing proxy evidence for the condition of forests at various times in ancient history. I look at three scientific methodologies, namely anthracology, palynology, and computer modeling. Each of these avenues of research offers support for the concept of forest change, both in abundance and species composition, and episodes of deforestation and erosion, and confirms my earlier work.

  16. Creative Ventures: Ancient Civilizations.

    Science.gov (United States)

    Stark, Rebecca

    The open-ended activities in this book are designed to extend the imagination and creativity of students and encourage students to examine their feelings and values about historic eras. Civilizations addressed include ancient Egypt, Greece, Rome, Mayan, Stonehenge, and Mesopotamia. The activities focus upon the cognitive and affective pupil…

  17. Mathematics in Ancient India

    Indian Academy of Sciences (India)

    SERIES I ARTICLE. Mathematics in Ancient India. 3. Brahmagupta's Lemma: The Samasabhavana. Amartya Kumar Dutta is an Associate Professor of. Mathematics at the. Indian Statistical. Institute, Kolkata. His research interest is in commutative algebra. Part 1, An overview, Reso- nance, VoL7, No.4, pp.4-19,. 2002. Part 2.

  18. Incest in Ancient Egypt

    Directory of Open Access Journals (Sweden)

    Škorić Marko

    2005-01-01

    Full Text Available There are many controversies that surround the problem of incest in Ancient Egypt. One of them is belief that incest was practiced exclusively by the Royal families, which is incorrect. I will try to show that at this time we don’t have satisfactory explanation of this kind of behavior, but that there are interesting suggestions for further research.

  19. Ancient ports of Kalinga

    Digital Repository Service at National Institute of Oceanography (India)

    Tripati, S.

    which plied between Kalinga and south east Asian countries. Nanda Raja, is said to have attacked Kalinga with the intention of getting access to the sea for the landlocked Kingdom of Magadha (Bihar). The ancient texa Artha Sastra (3rd-4th century B...

  20. Authenticity and commoditization at home

    DEFF Research Database (Denmark)

    Stender, Marie

    This paper investigates how interest and affect are entangled in the built environment of new Danish homes. The paper unfolds tensions and conflicts in the process from design through branding to occupancy of the house, and the relationship between authenticity and commoditization is explored....... The aim is to unfold how forces of commoditization and singularization intertwine as the house is transformed from an architectural expression into real estate for sale and eventually into somebody's home. What tensions are revealed in this process and how are interest and affect entangled? Authenticity...... seems to be a key concept in contemporary branding of products, places, and more recently also private homes. On the one hand authenticity thus seems to be closely related to the commercial value of things, on the other hand the authentic is held to be an expression of an inner nature or feeling...

  1. Robustness of digital artist authentication

    DEFF Research Database (Denmark)

    Jacobsen, Robert; Nielsen, Morten

    is in focus, while the robustness has not been considered, i.e. the degree to which the data collection process influences the decision of the method. However, in order for an authentication method to be successful in practice, it needs to be robust to plausible error sources from the data collection....... In this paper we investigate the robustness of the newly proposed authenticity method introduced by the authors based on second generation multiresolution analysis. This is done by modelling a number of realistic factors that can occur in the data collection.......In many cases it is possible to determine the authenticity of a painting from digital reproductions of the paintings; this has been demonstrated for a variety of artists and with different approaches. Common to all these methods in digital artist authentication is that the potential of the method...

  2. The fantasy of authenticity: touring with Lacan

    OpenAIRE

    Knudsen, Daniel C.; Rickly, J.M.; Vidon, Elizabeth S.

    2016-01-01

    Amidst the plethora of research regarding the meaning of authenticity, there remains uncertainty as to the work authenticity performs in tourism. Existential authenticity conceptually shifts focus from the objects of touristic practice to a sense of Being, suggesting that authenticity can be achieved, albeit only in the liminal moments of tourism experiences. Psychoanalysis would contend otherwise – authenticity will always be beyond our reach. In a 2006 publication, Tim Oakes broaches the to...

  3. Quantum direct communication with authentication

    International Nuclear Information System (INIS)

    Lee, Hwayean; Lim, Jongin; Yang, HyungJin

    2006-01-01

    We propose two quantum direct communication (QDC) protocols with user authentication. Users can identify each other by checking the correlation of Greenberger-Horne-Zeilinger (GHZ) states. Alice can directly send a secret message to Bob without any previously shared secret using the remaining GHZ states after authentication. Our second QDC protocol can be used even though there is no quantum link between Alice and Bob. The security of the transmitted message is guaranteed by properties of entanglement of GHZ states

  4. Authentication techniques for smart cards

    International Nuclear Information System (INIS)

    Nelson, R.A.

    1994-02-01

    Smart card systems are most cost efficient when implemented as a distributed system, which is a system without central host interaction or a local database of card numbers for verifying transaction approval. A distributed system, as such, presents special card and user authentication problems. Fortunately, smart cards offer processing capabilities that provide solutions to authentication problems, provided the system is designed with proper data integrity measures. Smart card systems maintain data integrity through a security design that controls data sources and limits data changes. A good security design is usually a result of a system analysis that provides a thorough understanding of the application needs. Once designers understand the application, they may specify authentication techniques that mitigate the risk of system compromise or failure. Current authentication techniques include cryptography, passwords, challenge/response protocols, and biometrics. The security design includes these techniques to help prevent counterfeit cards, unauthorized use, or information compromise. This paper discusses card authentication and user identity techniques that enhance security for microprocessor card systems. It also describes the analysis process used for determining proper authentication techniques for a system

  5. Authentication techniques for smart cards

    Energy Technology Data Exchange (ETDEWEB)

    Nelson, R.A.

    1994-02-01

    Smart card systems are most cost efficient when implemented as a distributed system, which is a system without central host interaction or a local database of card numbers for verifying transaction approval. A distributed system, as such, presents special card and user authentication problems. Fortunately, smart cards offer processing capabilities that provide solutions to authentication problems, provided the system is designed with proper data integrity measures. Smart card systems maintain data integrity through a security design that controls data sources and limits data changes. A good security design is usually a result of a system analysis that provides a thorough understanding of the application needs. Once designers understand the application, they may specify authentication techniques that mitigate the risk of system compromise or failure. Current authentication techniques include cryptography, passwords, challenge/response protocols, and biometrics. The security design includes these techniques to help prevent counterfeit cards, unauthorized use, or information compromise. This paper discusses card authentication and user identity techniques that enhance security for microprocessor card systems. It also describes the analysis process used for determining proper authentication techniques for a system.

  6. Tracking down human contamination in ancient human teeth

    DEFF Research Database (Denmark)

    Sampietro, María Lourdes; Gilbert, M Thomas P; Lao, Oscar

    2006-01-01

    DNA contamination arising from the manipulation of ancient calcified tissue samples is a poorly understood, yet fundamental, problem that affects the reliability of ancient DNA (aDNA) studies. We have typed the mitochondrial DNA hypervariable region I of the only 6 people involved in the excavation...... identified as contaminants, with those derived from the people involved in the retrieval and washing of the remains present in higher frequencies than those of the anthropologist and genetic researchers. This finding confirms, for the first time, previous hypotheses that teeth samples are most susceptible...... to contamination at their initial excavation. More worrying, the cloned contaminant sequences exhibit substitutions that can be attributed to DNA damage after the contamination event, and we demonstrate that the level of such damage increases with time: contaminants that are >10 years old have approximately 5...

  7. Authenticity in art

    International Nuclear Information System (INIS)

    Fleming, S.J.

    1975-01-01

    After a general introductory chapter, the subject is treated under three headings: paintings, ceramics and metals. The scientific tests for authenticity are described in their application to one or more of these branches of art. The traditional method of visual stylistic judgement is compared with and supplemented by scientific methods which (as well as 'wet' chemical analysis, optical microscopy, ultraviolet, infrared, electron and X-ray microscopy, X-ray crystallography and X-ray fluorescence, and direct age determination) include the following or more direct 'nuclear' interest: neutron (or proton, deuteron and high-energy photon) activation analysis for determining impurity and trace element content, gamma radiography for bronzes, neutron autoradiography or examining paintings, radiocarbon dating, other isotope dating (e.g. with lead isotopes and the radium-lead ratio), high temperature thermoluminescence for ceramics, and mass spectroscopy to determine isotope ratios indicative of particular sources of materials. As well as the reference in each chapter there is an additional bibliography. (U.K.)

  8. Deep Sequencing of RNA from Ancient Maize Kernels

    Science.gov (United States)

    Rasmussen, Morten; Cappellini, Enrico; Romero-Navarro, J. Alberto; Wales, Nathan; Alquezar-Planas, David E.; Penfield, Steven; Brown, Terence A.; Vielle-Calzada, Jean-Philippe; Montiel, Rafael; Jørgensen, Tina; Odegaard, Nancy; Jacobs, Michael; Arriaza, Bernardo; Higham, Thomas F. G.; Ramsey, Christopher Bronk; Willerslev, Eske; Gilbert, M. Thomas P.

    2013-01-01

    The characterization of biomolecules from ancient samples can shed otherwise unobtainable insights into the past. Despite the fundamental role of transcriptomal change in evolution, the potential of ancient RNA remains unexploited – perhaps due to dogma associated with the fragility of RNA. We hypothesize that seeds offer a plausible refuge for long-term RNA survival, due to the fundamental role of RNA during seed germination. Using RNA-Seq on cDNA synthesized from nucleic acid extracts, we validate this hypothesis through demonstration of partial transcriptomal recovery from two sources of ancient maize kernels. The results suggest that ancient seed transcriptomics may offer a powerful new tool with which to study plant domestication. PMID:23326310

  9. Bacteria in ancient sediments

    International Nuclear Information System (INIS)

    Izzo, G.

    1986-01-01

    In order to ascertain the role of biological activity in ancient sediments, two microbiological studies were carried out. The first was on pleistocenic clay sediments on land, the second on deep oceanic sediments. In the present paper by direct counting the samples is demonstrated the presence of bacteria in a range of 10 5 to 10 7 . Further studies must be carried out to ascertain the activities by in situ incubation methods

  10. Childbirth in ancient Egypt.

    Science.gov (United States)

    Chamberlain, Geoffrey

    2004-11-01

    Medicine in ancient Egypt was much more advanced than the rest of the Biblical world, especially in trauma surgery. Care at the time of childbirth was however virtually non-existent. There were no trained obstetricians or midwives but a galaxy of gods were at hand. This article traces what we can piece together about pregnancy of childbirth from the evidence we have in tombs and papyri of Egypt.

  11. Linen in Ancient Egypt

    Directory of Open Access Journals (Sweden)

    dr.Rehab Mahmoud Ahmed Elsharnouby

    2014-01-01

    Full Text Available Egypt was famous through the Ancient Near East for both weaving linen cloth and the produced quantities. Cloth was sent as expensive gifts from one king to another and given to a laborer as wages in return for his work. Cloth was regarded as an essential element in everyday life as it could be used for everything: clothing, bedding, trappings for animals, or sails of a ship. It was in fact one of the most widely used item throughout Ancient Egypt. Although other textile fibers were used in Pharaonic Egypt, namely, sheep's wool, goat hair and a form of coir, the majority of textiles were made from the plant Linum usitatissimum, flax. Cloth made from this fiber is defined as linen. The research starts with a brief definition of the flax, and then reviews the scenes representing the sowing and the harvesting of its seeds. It also focuses on the way of removing the seeds heads, the preparing of the flax for spinning: retting, beating and scutching. After that, it deals with transforming flax into orderly lengths, and rolling it into balls or coils. The researcher as well studies the Ancient Egyptian spinning techniques: grasped spindle, support spindle and drop spinning; the different types of weaving: tabby weaves, basket weaves, tapestry weaves and warps-patterned weave and the types of looms that were in use in Egypt, namely, the horizontal and vertical looms.

  12. Use of neutron diffraction and laser-induced plasma spectroscopy in integrated authentication methodologies of copper alloy artefacts

    International Nuclear Information System (INIS)

    Siano, S.; Bartol, L.; Mencaglia, A.A.; Agresti, J.; Miccio, M.

    2009-01-01

    The present study approaches the general problem of the authentication of copper alloy artefacts of art and historical interest using non-invasive analytical techniques. It aims to demonstrate that a suitable combination of time-of-flight neutron diffraction and laser-induced plasma spectroscopy in integrated multidisciplinary authentication methodologies can provide crucial data for discriminating between genuine archaeological objects and modern counterfeits. After introducing the methodology, which is dedicated in particular to copper alloy figurines of ancient style, two representative authentication case studies are discussed. The results of the work provide evidence that the combination of multiphase analysis using TOF-N D and elemental depth profiles provided by Lips makes it possible to solve most of the present authentication problems.

  13. Authentication codes that permit arbitration

    Energy Technology Data Exchange (ETDEWEB)

    Simmons, G.J.

    1987-01-01

    Objective of authentication is to detect attempted deceptions in a communications channel. Traditionally this has been restricted to providing the authorized receiver with a capability of detecting unauthentic messages. The known codes have all left open the possibility for either the transmitter to disavow a message that he actually sent to the receiver, i.e., an authentic message, or else for the receiver to falsely attribute a message of his own devising to the transmitter. Of course the party being deceived would know that he was the victim of a deception by the other, but would be unable to ''prove'' this to a third party. Ideally, authentication should provide a means to detect attempted deceptions by insiders (the transmitter or receiver) as well as outsiders (the opponent). It has been an open question of whether it was possible to devise authentication codes that would permit a third party, an arbiter, to decide (in probability) whether the transmitter or the receiver was cheating in the event of a dispute. We answer this question in that both permits the receiver to detect outsider deceptions, as well affirmative by first constructing an example of an authentication code as permitting a designated arbiter to detect insider deceptions and then by generalizing this construction to an infinite class of such codes.

  14. Suicide in ancient Greece.

    Science.gov (United States)

    Laios, K; Tsoukalas, G; Kontaxaki, M-I; Karamanou, M; Androutsos, G

    2014-01-01

    The theme of suicide appears several times in ancient Greek literature. However, each such reference acquires special significance depending on the field from which it originates. Most of the information found in mythology, but the suicide in a mythological tale, although in terms of motivation and mental situation of heroes may be in imitation of similar incidents of real life, in fact is linked with the principles of the ancient Greek religion. In ancient drama and mainly in tragedies suicide conduces to the tragic hypostasis of the heroes and to the evolution of the plot and also is a tool in order to be presented the ideas of poets for the relations of the gods, the relation among gods and men and the relation among the men. In ancient Greek philosophy there were the deniers of suicide, who were more concerned about the impact of suicide on society and also these who accepted it, recognizing the right of the individual to put an end to his life, in order to avoid personal misfortunes. Real suicides will be found mostly from historical sources, but most of them concern leading figures of the ancient world. Closer to the problem of suicide in the everyday life of antiquity are ancient Greek medicines, who studied the phenomenon more general without references to specific incidents. Doctors did not approve in principal the suicide and dealt with it as insane behavior in the development of the mental diseases, of melancholia and mania. They considered that the discrepancy of humors in the organ of logic in the human body will cause malfunction, which will lead to the absurdity and consequently to suicide, either due to excessive concentration of black bile in melancholia or due to yellow bile in mania. They believed that greater risk to commit suicide had women, young people and the elderly. As therapy they used the drugs of their time with the intention to induce calm and repression in the ill person, therefore they mainly used mandragora. In general, we would say

  15. Deep Brain Stimulation, Authenticity and Value.

    Science.gov (United States)

    Pugh, Jonathan; Maslen, Hannah; Savulescu, Julian

    2017-10-01

    Deep brain stimulation has been of considerable interest to bioethicists, in large part because of the effects that the intervention can occasionally have on central features of the recipient's personality. These effects raise questions regarding the philosophical concept of authenticity. In this article, we expand on our earlier work on the concept of authenticity in the context of deep brain stimulation by developing a diachronic, value-based account of authenticity. Our account draws on both existentialist and essentialist approaches to authenticity, and Laura Waddell Ekstrom's coherentist approach to personal autonomy. In developing our account, we respond to Sven Nyholm and Elizabeth O'Neill's synchronic approach to authenticity, and explain how the diachronic approach we defend can have practical utility, contrary to Alexandre Erler and Tony Hope's criticism of autonomy-based approaches to authenticity. Having drawn a distinction between the authenticity of an individual's traits and the authenticity of that person's values, we consider how our conception of authenticity applies to the context of anorexia nervosa in comparison to other prominent accounts of authenticity. We conclude with some reflections on the prudential value of authenticity, and by highlighting how the language of authenticity can be invoked to justify covert forms of paternalism that run contrary to the value of individuality that seems to be at the heart of authenticity.

  16. Designing assignment using authentic assessment

    Science.gov (United States)

    Arlianty, Widinda Normalia; Febriana, Beta Wulan; Diniaty, Artina; Fauzi'ah, Lina

    2017-12-01

    This research is conducted to get an overview of the use of authentic assessment in the department of chemistry education, Islamic University of Indonesia. This research was conducted on the students of semester five, odd semester of academic year 2016/2017. Authentic assessment is an assessment process that is capable of measuring the knowledge, attitudes and skills of learners. Chemistry teacher candidates are required to be equipped with teaching and judging skills. Teachers were required can design and carry out assessment of the process and learning outcomes of students in an objective, accountable, and informative. Teacher creativity is required in the assessment. Therefore, authentic assessment is very appropriate used to improve the competence of students in education department as teachers candidates in the preparation of learning assessments.

  17. Polymeric self-authenticating banknotes

    Science.gov (United States)

    Zientek, Paul

    1998-04-01

    This paper discusses a new concept in overt security called the self-authenticating banknote. The self-authenticating banknote concept is built around the transparent window feature of the polymer banknote. This feature allows the incorporation of transmission based optical devices on a banknote so that the user, by folding the note over on itself and looking through an optical device which is a part of the note itself, can visually inspect and verify certain security features on the banknote. This paper presents a number of examples of optical devices which are presently being developed for this purpose.

  18. Whole-genome shotgun sequencing of mitochondria from ancient hair shafts

    DEFF Research Database (Denmark)

    Gilbert, M Thomas P; Tomsho, Lynn P; Rendulic, Snjezana

    2007-01-01

    Although the application of sequencing-by-synthesis techniques to DNA extracted from bones has revolutionized the study of ancient DNA, it has been plagued by large fractions of contaminating environmental DNA. The genetic analyses of hair shafts could be a solution: We present 10 previously...

  19. Measuring Teacher Authenticity: Criteria Students Use in Their Perception of Teacher Authenticity

    Science.gov (United States)

    De Bruyckere, Pedro; Kirschner, Paul A.

    2017-01-01

    Authenticity is an often-heard term with respect to education. Tasks should be authentic, the learning environment should be authentic and, above all, the teacher should be authentic. Previous qualitative research has shown that there are four primary criteria that students in formal educational settings use when forming their perceptions of…

  20. Measuring teacher authenticity: Criteria students use in their perception of teacher authenticity

    NARCIS (Netherlands)

    De Bruyckere, Pedro; Kirschner, Paul A.

    2018-01-01

    Authenticity is an often-heard term with respect to education. Tasks should be authentic, the learning environment should be authentic and, above all, the teacher should be authentic. Previous qualitative research has shown that there are four primary criteria that students in formal educational

  1. Climate and Ancient Societies

    DEFF Research Database (Denmark)

    Climate, and human responses to it, have a strongly interconnected relationship. This when climate change occurs, the result of either natural or human causes, societies should react and adapt to these. But do they? If so, what is the nature of that change, and are the responses positive...... or negative for the long-term survival of social groups? In this volume, scholars from diverse disciplines including archaeology, geology and climate sciences explore scientific and material evidence for climate changes in the past, their causes, their effects on ancient societies and how those societies...

  2. Urology in ancient India

    Directory of Open Access Journals (Sweden)

    Sakti Das

    2007-01-01

    Full Text Available The practice of medical and surgical measures in the management of urological ailments prevailed in ancient India from the Vedic era around 3000 BC. Subsequently in the Samhita period, the two stalwarts - Charaka in medicine and Susruta in surgery elevated the art of medicine in India to unprecedented heights. Their elaboration of the etiopathological hypothesis and the medical and surgical treatments of various urological disorders of unparalleled ingenuity still remain valid to some extent in our contemporary understanding. The new generation of accomplished Indian urologists should humbly venerate the legacy of the illustrious pioneers in urology of our motherland.

  3. [Sexuality in Ancient Egypt].

    Science.gov (United States)

    Androutsos, G; Marketos, S

    1994-10-01

    The present article explores the sexuality in ancient Egypt. In particular in this article are presented the ways of concubinage (marriage, concubinage, adultery), the incest, loves of the pharaohs and of the common people, the freedom of choice in garments, the status of the hetairas and of the whores, the sexual perversions (male and female homosexuality, necrophilia, sodomism, bestiality, rape, masturbation, exhibitionism), the operations of the genitals (circumcision, excision, castration) and finally the level of knowledge in gynaecology, fertility, contraception and obstetrics that even today demands our admiration.

  4. Obscuring the ancient artifacts

    International Nuclear Information System (INIS)

    Tugrul, B.

    1987-01-01

    Radiography is a non-destructive method which is preferable for ancient artifacts. X-rays, gama rays, beta rays and neutrons can be used for radiography. Differences of them and application materials can be different. In this study, the radiographic techniques are determined with application parameters according to materials of the artifacts, and some interesting examples are given. Therefore, investigation of the artifacts can be realized for definition of physical properties, manufacturing techniques and quality controls of them easily by the application of the radiography. (author)

  5. Mathematics in ancient Greece

    CERN Document Server

    Dantzig, Tobias

    2006-01-01

    More than a history of mathematics, this lively book traces mathematical ideas and processes to their sources, stressing the methods used by the masters of the ancient world. Author Tobias Dantzig portrays the human story behind mathematics, showing how flashes of insight in the minds of certain gifted individuals helped mathematics take enormous forward strides. Dantzig demonstrates how the Greeks organized their precursors' melange of geometric maxims into an elegantly abstract deductive system. He also explains the ways in which some of the famous mathematical brainteasers of antiquity led

  6. Authenticity, Autonomy and Altruism: Keys for Transformation

    Science.gov (United States)

    Clarken, Rodney

    2011-01-01

    The value of authentic knowing, autonomous behavior and altruistic motivation is presented. Authenticity, autonomy and altruism are primary human capacities and keys for individual and collective transformation. Realizing the full development of these three basic potentialities can serve as goals and standards for well-being. Authenticity,…

  7. 29 CFR 18.50 - Authenticity.

    Science.gov (United States)

    2010-07-01

    ... 29 Labor 1 2010-07-01 2010-07-01 true Authenticity. 18.50 Section 18.50 Labor Office of the Secretary of Labor RULES OF PRACTICE AND PROCEDURE FOR ADMINISTRATIVE HEARINGS BEFORE THE OFFICE OF ADMINISTRATIVE LAW JUDGES General § 18.50 Authenticity. The authenticity of all documents submitted as proposed...

  8. 28 CFR 68.46 - Authenticity.

    Science.gov (United States)

    2010-07-01

    ... 28 Judicial Administration 2 2010-07-01 2010-07-01 false Authenticity. 68.46 Section 68.46... ALIENS, UNFAIR IMMIGRATION-RELATED EMPLOYMENT PRACTICES, AND DOCUMENT FRAUD § 68.46 Authenticity. The authenticity of all documents submitted as proposed exhibits in advance of the hearing shall be deemed admitted...

  9. Authentic Montessori: The Teacher Makes the Difference

    Science.gov (United States)

    Huxel, Alexa C.

    2013-01-01

    What are the elements that make up authentic Montessori? Is Montessori something concrete or abstract? Are there intangibles that make Montessori what it is? Many classrooms today have Montessori materials and small tables and chairs. Are they authentic Montessori? When examining areas that traditionally make defining authentic Montessori…

  10. 1 authentic leadership and spiritual capital development

    African Journals Online (AJOL)

    2008-05-01

    May 1, 2008 ... The purpose of this paper is to examine authentic leadership and spiritual capital as key elements for the successful building of quality management and effective organizations. It highlights the nexus between authentic leadership and spiritual capital, describes the common features of authentic leadership.

  11. Authentication of Herbal Supplements Using Next-Generation Sequencing.

    Science.gov (United States)

    Ivanova, Natalia V; Kuzmina, Maria L; Braukmann, Thomas W A; Borisenko, Alex V; Zakharov, Evgeny V

    2016-01-01

    DNA-based testing has been gaining acceptance as a tool for authentication of a wide range of food products; however, its applicability for testing of herbal supplements remains contentious. We utilized Sanger and Next-Generation Sequencing (NGS) for taxonomic authentication of fifteen herbal supplements representing three different producers from five medicinal plants: Echinacea purpurea, Valeriana officinalis, Ginkgo biloba, Hypericum perforatum and Trigonella foenum-graecum. Experimental design included three modifications of DNA extraction, two lysate dilutions, Internal Amplification Control, and multiple negative controls to exclude background contamination. Ginkgo supplements were also analyzed using HPLC-MS for the presence of active medicinal components. All supplements yielded DNA from multiple species, rendering Sanger sequencing results for rbcL and ITS2 regions either uninterpretable or non-reproducible between the experimental replicates. Overall, DNA from the manufacturer-listed medicinal plants was successfully detected in seven out of eight dry herb form supplements; however, low or poor DNA recovery due to degradation was observed in most plant extracts (none detected by Sanger; three out of seven-by NGS). NGS also revealed a diverse community of fungi, known to be associated with live plant material and/or the fermentation process used in the production of plant extracts. HPLC-MS testing demonstrated that Ginkgo supplements with degraded DNA contained ten key medicinal components. Quality control of herbal supplements should utilize a synergetic approach targeting both DNA and bioactive components, especially for standardized extracts with degraded DNA. The NGS workflow developed in this study enables reliable detection of plant and fungal DNA and can be utilized by manufacturers for quality assurance of raw plant materials, contamination control during the production process, and the final product. Interpretation of results should involve an

  12. Authentication of Herbal Supplements Using Next-Generation Sequencing.

    Directory of Open Access Journals (Sweden)

    Natalia V Ivanova

    Full Text Available DNA-based testing has been gaining acceptance as a tool for authentication of a wide range of food products; however, its applicability for testing of herbal supplements remains contentious.We utilized Sanger and Next-Generation Sequencing (NGS for taxonomic authentication of fifteen herbal supplements representing three different producers from five medicinal plants: Echinacea purpurea, Valeriana officinalis, Ginkgo biloba, Hypericum perforatum and Trigonella foenum-graecum. Experimental design included three modifications of DNA extraction, two lysate dilutions, Internal Amplification Control, and multiple negative controls to exclude background contamination. Ginkgo supplements were also analyzed using HPLC-MS for the presence of active medicinal components.All supplements yielded DNA from multiple species, rendering Sanger sequencing results for rbcL and ITS2 regions either uninterpretable or non-reproducible between the experimental replicates. Overall, DNA from the manufacturer-listed medicinal plants was successfully detected in seven out of eight dry herb form supplements; however, low or poor DNA recovery due to degradation was observed in most plant extracts (none detected by Sanger; three out of seven-by NGS. NGS also revealed a diverse community of fungi, known to be associated with live plant material and/or the fermentation process used in the production of plant extracts. HPLC-MS testing demonstrated that Ginkgo supplements with degraded DNA contained ten key medicinal components.Quality control of herbal supplements should utilize a synergetic approach targeting both DNA and bioactive components, especially for standardized extracts with degraded DNA. The NGS workflow developed in this study enables reliable detection of plant and fungal DNA and can be utilized by manufacturers for quality assurance of raw plant materials, contamination control during the production process, and the final product. Interpretation of results should

  13. Symmetric Key Authentication Services Revisited

    NARCIS (Netherlands)

    Crispo, B.; Popescu, B.C.; Tanenbaum, A.S.

    2004-01-01

    Most of the symmetric key authentication schemes deployed today are based on principles introduced by Needham and Schroeder [15] more than twenty years ago. However, since then, the computing environment has evolved from a LAN-based client-server world to include new paradigms, including wide area

  14. Authentic Supervision Reconciles the Irreconcilables.

    Science.gov (United States)

    Pajak, Edward F.; Seyfarth, John T.

    1983-01-01

    Successful supervisors share a characteristic of "authenticity," rather than a particular pattern of behavior. From a background of Gestalt psychology, four steps are offered to help supervisors become aware of their own needs and feelings and recognize the "shoulds" that prevent real contact with others. (MLF)

  15. Authenticity and Relationships with Students

    Science.gov (United States)

    Frego, Katherine A.

    2006-01-01

    Although authenticity makes one vulnerable, the author believes that its impact on learning and on enjoyment of the teaching and learning process justifies the risk. This chapter describes how to offer a relationship to each student, focusing on appropriate caring for individuals and for learning. (Contains 1 figure.)

  16. Immersive Learning: Realism, Authenticity & Audience

    OpenAIRE

    Livingstone, Daniel

    2016-01-01

    For almost 20 years the Digital Design Studio has been exploring and applying virtual reality for a wide range of industrial, commercial and educational applications. Drawing from a range of recent projects, we explore the complex relationships between realism, authenticity and audience for effective engagement and education in immersive learning.

  17. Embodying Authenticity in Higher Education

    Science.gov (United States)

    Douglass, Laura

    2016-01-01

    Orienting to the community of higher education involves a learning experience that is authentic and embodied for one new college administrator. Reflecting on her experience, she articulates how her relationship to her body helps to understand and respond to the tensions of engaging with a scholarly community.

  18. Towards an Authentic Indian Environmentalism

    African Journals Online (AJOL)

    Jenny

    An attempt must therefore be made to formulate a more authentic Indian environmental perspective.To do this ... (of government forests), global warming and ozone depletion that feature in the media and existing school textbooks.To get started .... Not only that, numerous water parks and golf courses are springing up for the ...

  19. Literacy Cafe: Making Writing Authentic

    Science.gov (United States)

    Daniels, Erika

    2007-01-01

    The "Literacy Cafe," a celebration of genre study and student writing, offers students (and visitors!) a positive environment in which to engage in reading and discussion of writing without self-consciousness or fear of criticism. It works because students learn to recognize writing as a learning tool and a relevant, authentic skill in the real…

  20. Authenticity or School-only?

    DEFF Research Database (Denmark)

    Fougt, Simon Skov

    Challenging the apparent distinction among educational researchers between ‘authenticity’ outside schools and ‘school-only’ inside schools, this paper investigates the concept of meaningfulness from different perspectives with a focus on formal learning in schools, as it states that teaching...... and learning inside school also can be authentic....

  1. The embodiment of authentic leadership.

    Science.gov (United States)

    Waite, Roberta; McKinney, Nicole; Smith-Glasgow, Mary Ellen; Meloy, Faye A

    2014-01-01

    Development of student leadership capacity and efficacy is critical to the nursing profession, and vital to this process is a strong foundation in critical thinking that includes a depth of understanding of self (i.e., authentic leadership development). This article will (a) present a theoretical overview of authentic leadership as compared with other popular leadership theories, (b) provide an overview of development/implementation of an authentic leadership course, the first in a series of six one-credit courses as an integral component of the Macy Undergraduate Leadership Fellows Program for upper-level nursing students, and (c) discuss related implications for nursing education. Findings from an investigator-developed quantitative pre-post survey and qualitative evaluation questions are provided. Student feedback regarding the comprehensive nature of the course was extremely positive and affirmed the value of introspection associated with authentic leadership in ongoing personal and professional development. Critical pedagogy and action-oriented learning strategies also proved beneficial to student engagement. Copyright © 2014 Elsevier Inc. All rights reserved.

  2. Improving Usability of Passphrase Authentication

    DEFF Research Database (Denmark)

    Nielsen, Glen; Vedel, Michael; Jensen, Christian D.

    2014-01-01

    . This is done to ensure an appropriate degree of security, but instead, it makes it difficult for users to remember their password, which results in passwords that are either insecure, but easy to remember, or written down on paper. In this paper we address the problem of usability in user authentication...

  3. Ancient celtic horns

    Science.gov (United States)

    Campbell, Murray

    2002-11-01

    There is considerable evidence from iconographic and documentary sources that musical lip-reed instruments were important in the early celtic communities of Scotland and Ireland. In recent years several studies have been undertaken with the aim of gaining a better understanding of the musical nature of these ancient horns, and of their place in the life and culture of the time. A valuable source of tangible evidence is to be found in the archaeological remains deposited across Scotland and the whole of Ireland. A project is now under way, under the auspices of the Kilmartin House Trust and the general direction of John Purser, which has brought together an international team of musicians, craftsmen, archaeologists, musicologists and physicists with the aim of analyzing ancient musical artifacts, reconstructing some of the original instruments, and analyzing the sounds they produce. This paper describes acoustical studies carried out on a number of recent reconstructions of wooden and bronze instruments, and discusses the role of acoustics in this type of investigation. [Work supported by Sciart and EPSRC.

  4. Exploring Ancient Skies A Survey of Ancient and Cultural Astronomy

    CERN Document Server

    Kelley, David H

    2011-01-01

    Exploring Ancient Skies brings together the methods of archaeology and the insights of modern astronomy to explore the science of astronomy as it was practiced in various cultures prior to the invention of the telescope. The book reviews an enormous and growing body of literature on the cultures of the ancient Mediterranean, the Far East, and the New World (particularly Mesoamerica), putting the ancient astronomical materials into their archaeological and cultural contexts. The authors begin with an overview of the field and proceed to essential aspects of naked-eye astronomy, followed by an examination of specific cultures. The book concludes by taking into account the purposes of ancient astronomy: astrology, navigation, calendar regulation, and (not least) the understanding of our place and role in the universe. Skies are recreated to display critical events as they would have appeared to ancient observers—events such as the supernova of 1054 A.D., the "lion horoscope," and the Star of Bethlehem. Explori...

  5. Perspectives for DNA studies on polar ice cores

    DEFF Research Database (Denmark)

    Hansen, Anders J.; Willerslev, E.

    2002-01-01

    Recently amplifiable ancient DNA was obtained from a Greenland ice core. The DNA revealed a diversity of fungi, plants, algae and protists and has thereby expanded the range of detectable organic material in fossil glacier ice. The results suggest that ancient DNA can be obtained from other ice c...

  6. Bioinformatical approaches to RNA structure prediction & Sequencing of an ancient human genome

    DEFF Research Database (Denmark)

    Lindgreen, Stinus

    in the publication of the first genome of an ancient human individual, where close to the theoretical maximum of the genome sequence was recovered with high confidence. Part of the project was the development of the program SNPest for genotyping and SNP calling that models various sources of error and predicts...... tools that exist. The second part has been focused on the mapping and genotyping of ancient genomic DNA. The development of next generation sequencing technologies combined with the use of ancient DNA material present the researchers with some special challenges in the analyses. This work resulted...

  7. Authenticity as an aim of psychoanalysis.

    Science.gov (United States)

    Neri, Claudio

    2008-12-01

    This paper will present a series of predominantly clinical observations concerning the lengthy work a patient carries out, with the help of the analyst, in order to achieve greater personal authenticity. When this work is drawing to a close and the patient has gained a degree of authenticity, this authenticity remains within him, almost without his realizing it. The power of authenticity is instead revealed through the patient's most intimate and important relationships. In the long term, the patient's authenticity also alters his perception of himself and of his role in the world. He feels more alive and less overcome by a sense of futility, if earlier this had been the case.

  8. Quantum identity authentication with single photon

    Science.gov (United States)

    Hong, Chang ho; Heo, Jino; Jang, Jin Gak; Kwon, Daesung

    2017-10-01

    Quantum identity authentication with single photons is proposed in the paper. It can verify a user's identity without exposing to an authentication key information. The protocol guarantees high efficiency in that it can verify two bits of authentication information using just a single photon. The security of our authentication scheme is analyzed and confirmed in the case of a general attack. Moreover, the proposed protocol is practicable with current technology. Our quantum identity authentication protocol does not require quantum memory registration and any entangled photon sources.

  9. A quick method for authentication of ceramic art objects

    International Nuclear Information System (INIS)

    Becker, K.; Goedicke, C.

    1978-01-01

    Thermoluminescence (TL) readout equipment is now in wide use for dosimetric purposes, and the principle of TL dating of ancient pottery generally known. On the other hand, the well-known difficulties in establishing ages by this method with reasonable accuracy discouraged investigators to apply commercial or self-developed TL equipment to the much more frequent and simpler problem of distinguishing between old (=original) and new (=faked) ceramic art objects. The paper describes how, with little additional equipment and modifications of TL readers, authentication tests can be carried out based on the measurement of the TL from large (approximately 0.1-0.25 mm) quartz grains which have been isolated from the pottery. (Auth.)

  10. An Authentication Protocol for Future Sensor Networks.

    Science.gov (United States)

    Bilal, Muhammad; Kang, Shin-Gak

    2017-04-28

    Authentication is one of the essential security services in Wireless Sensor Networks (WSNs) for ensuring secure data sessions. Sensor node authentication ensures the confidentiality and validity of data collected by the sensor node, whereas user authentication guarantees that only legitimate users can access the sensor data. In a mobile WSN, sensor and user nodes move across the network and exchange data with multiple nodes, thus experiencing the authentication process multiple times. The integration of WSNs with Internet of Things (IoT) brings forth a new kind of WSN architecture along with stricter security requirements; for instance, a sensor node or a user node may need to establish multiple concurrent secure data sessions. With concurrent data sessions, the frequency of the re-authentication process increases in proportion to the number of concurrent connections. Moreover, to establish multiple data sessions, it is essential that a protocol participant have the capability of running multiple instances of the protocol run, which makes the security issue even more challenging. The currently available authentication protocols were designed for the autonomous WSN and do not account for the above requirements. Hence, ensuring a lightweight and efficient authentication protocol has become more crucial. In this paper, we present a novel, lightweight and efficient key exchange and authentication protocol suite called the Secure Mobile Sensor Network (SMSN) Authentication Protocol. In the SMSN a mobile node goes through an initial authentication procedure and receives a re-authentication ticket from the base station. Later a mobile node can use this re-authentication ticket when establishing multiple data exchange sessions and/or when moving across the network. This scheme reduces the communication and computational complexity of the authentication process. We proved the strength of our protocol with rigorous security analysis (including formal analysis using the BAN

  11. Ancient Chinese Sundials

    Science.gov (United States)

    Deng, Kehui

    Timekeeping was essential in the agricultural society of ancient China. The use of sundials for timekeeping was associated with the use of the gnomon, which had its origin in remote antiquity. This chapter studies three sundials (guiyi 晷仪) from the Qin and Han dynasties, the shorter shadow plane sundial (duanying ping yi 短影平仪) invented by Yuan Chong in the Sui Dynasty, and the sundial chart (guiyingtu 晷影图) invented by Zeng Minxing in the Southern Song dynasty. This chapter also introduces Guo Shoujing's hemispherical sundial (yang yi 仰仪). A circular stone sundial discovered at the Small Wild Goose Pagoda in Xi'an is also mentioned. It is dated from the Sui and Tang dynasties. A brief survey of sundials from the Qing dynasty shows various types of sundials.

  12. Ancient Greek new music

    Directory of Open Access Journals (Sweden)

    Martin Žužek

    2000-12-01

    Full Text Available In this article I use a contextual approach to questions about the revolutionary »new music« in ancient Greece. This view is different from the nowadays most common formalistk view. Rather than analyze textual sources stylistically, I will try to present the available lata in the context of the structure and events of the Athenian society at a tirne when a wave of »new« poetics appeared. In the following discussion it is argued that the »new music« and the phenomena of the destruction of mousiké connected with it are not an esthetical novum, but more a consequence of the change of the discursive practice, where a musical poetry became less important and needless.

  13. Characterization of Ancient Tripitaka

    Directory of Open Access Journals (Sweden)

    Y. X. Gong

    2015-08-01

    Full Text Available Tripitaka is the world’s most comprehensive version of Buddhist sutra. There are limited numbers of Tripitaka currently preserved, most of them present various patterns of degradation. As little is known about the materials and crafts used in Tripitaka, it appeared necessary to identify them, and to further define adapted conservation treatment. In this work, a study concerning the paper source and dyestuff of the Tripitaka from approximate 16th century was carried out using fiber analysis and thin-layer chromatography (TLC. The results proved that the papers were mainly made from hemp or bark of mulberry tree, and indigo was used for colorizing the paper. At the end, we provide with suggestions for protecting and restoring the ancient Tripitaka.

  14. Infusing Authentic Inquiry into Biotechnology

    Science.gov (United States)

    Hanegan, Nikki L.; Bigler, Amber

    2009-10-01

    Societal benefit depends on the general public's understandings of biotechnology (Betsch in World J Microbiol Biotechnol 12:439-443, 1996; Dawson and Cowan in Int J Sci Educ 25(1):57-69, 2003; Schiller in Business Review: Federal Reserve Bank of Philadelphia (Fourth Quarter), 2002; Smith and Emmeluth in Am Biol Teach 64(2):93-99, 2002). A National Science Foundation funded survey of high school biology teachers reported that hands-on biotechnology education exists in advanced high school biology in the United States, but is non-existent in mainstream biology coursework (Micklos et al. in Biotechnology labs in American high schools, 1998). The majority of pre-service teacher content preparation courses do not teach students appropriate content knowledge through the process of inquiry. A broad continuum exists when discussing inquiry-oriented student investigations (Hanegan et al. in School Sci Math J 109(2):110-134, 2009). Depending on the amount of structure in teacher lessons, inquiries can often be categorized as guided or open. The lesson can be further categorized as simple or authentic (Chinn and Malhotra in Sci Educ 86(2):175-218, 2002). Although authentic inquiries provide the best opportunities for cognitive development and scientific reasoning, guided and simple inquiries are more often employed in the classroom (Crawford in J Res Sci Teach 37(9):916-937, 2000; NRC in Inquiry and the national science education standards: a guide for teaching and learning, 2000). For the purposes of this study we defined inquiry as "authentic" if original research problems were resolved (Hanegan et al. in School Sci Math J 109(2):110-134, 2009; Chinn and Malhotra in Sci Educ 86(2):175-218, 2002; Roth in Authentic school science: knowing and learning in open-inquiry science laboratories, 1995). The research question to guide this study through naturalistic inquiry research methods was: How will participants express whether or not an authentic inquiry experience enhanced

  15. Halal authenticity of gelatin using species-specific PCR.

    Science.gov (United States)

    Shabani, Hessam; Mehdizadeh, Mehrangiz; Mousavi, Seyed Mohammad; Dezfouli, Ehsan Ansari; Solgi, Tara; Khodaverdi, Mahdi; Rabiei, Maryam; Rastegar, Hossein; Alebouyeh, Mahmoud

    2015-10-01

    Consumption of food products derived from porcine sources is strictly prohibited in Islam. Gelatin, mostly derived from bovine and porcine sources, has many applications in the food and pharmaceutical industries. To ensure that food products comply with halal regulations, development of valid and reliable analytical methods is very much required. In this study, a species-specific polymerase chain reaction (PCR) assay using conserved regions of mitochondrial DNA (cytochrome b gene) was performed to evaluate the halal authenticity of gelatin. After isolation of DNA from gelatin powders with known origin, conventional PCR using species-specific primers was carried out on the extracted DNA. The amplified expected PCR products of 212 and 271 bp were observed for porcine and bovine gelatin, respectively. The sensitivity of the method was tested on binary gelatin mixtures containing 0.1%, 1%, 10%, and 100% (w/w) of porcine gelatin within bovine gelatin and vice versa. Although most of the DNA is degraded due to the severe processing steps of gelatin production, the minimum level of 0.1% w/w of both porcine and bovine gelatin was detected. Moreover, eight food products labeled as containing bovine gelatin and eight capsule shells were subjected to PCR examination. The results showed that all samples contained bovine gelatin, and the absence of porcine gelatin was verified. This method of species authenticity is very useful to verify whether gelatin and gelatin-containing food products are derived from halal ingredients. Copyright © 2015 Elsevier Ltd. All rights reserved.

  16. Illuminating the evolution of equids and rodents with next-generation sequencing of ancient specimens

    DEFF Research Database (Denmark)

    Mouatt, Julia Thidamarth Vilstrup

    The sequencing of ancient DNA provides perspectives on the genetic history of past populations and extinct species. However, ancient DNA research presents specific limitations mostly due to DNA survival, damage and contamination. Yet with stringent laboratory procedures, the sensitivity of target...... enrichment methods and the massive throughput and latest advances within DNA sequencing, the field of ancient DNA has flourished in later years. Those advances have even enabled the sequencing of complete genomes from the past, moving the field into genomic sciences. In this thesis we have used these latest...... ial genomes of extant and extinct taxa, and dated major radiation events within Equidae. We have also revealed the phylogenetic origins of hutias, a group of capromyid rodents from the West Indies using museum specimens and a museomic approach, and at the other end of the spectrum, characterized...

  17. Accurate determination of genetic identity for a single cacao bean, using molecular markers with a nanofluidic system, ensures cocoa authentication.

    Science.gov (United States)

    Fang, Wanping; Meinhardt, Lyndel W; Mischke, Sue; Bellato, Cláudia M; Motilal, Lambert; Zhang, Dapeng

    2014-01-15

    Cacao (Theobroma cacao L.), the source of cocoa, is an economically important tropical crop. One problem with the premium cacao market is contamination with off-types adulterating raw premium material. Accurate determination of the genetic identity of single cacao beans is essential for ensuring cocoa authentication. Using nanofluidic single nucleotide polymorphism (SNP) genotyping with 48 SNP markers, we generated SNP fingerprints for small quantities of DNA extracted from the seed coat of single cacao beans. On the basis of the SNP profiles, we identified an assumed adulterant variety, which was unambiguously distinguished from the authentic beans by multilocus matching. Assignment tests based on both Bayesian clustering analysis and allele frequency clearly separated all 30 authentic samples from the non-authentic samples. Distance-based principle coordinate analysis further supported these results. The nanofluidic SNP protocol, together with forensic statistical tools, is sufficiently robust to establish authentication and to verify gourmet cacao varieties. This method shows significant potential for practical application.

  18. Improving Usability of Passphrase Authentication

    DEFF Research Database (Denmark)

    Nielsen, Glen; Vedel, Michael; Jensen, Christian D.

    2014-01-01

    . This is done to ensure an appropriate degree of security, but instead, it makes it difficult for users to remember their password, which results in passwords that are either insecure, but easy to remember, or written down on paper. In this paper we address the problem of usability in user authentication.......We promote the use of passphrases, which provide better security and are often easier to remember than passwords. Passphrases will be significantly longer than passwords, which makes them more difficult to enter correctly on a keyboard. We solve this problem by proposing a new passphrase validation algorithm......The combination of user-names and passwords has become the predominant method of user authentication in computer systems. Most users have multiple accounts on different systems, which impose different constraints on the length and complexity of passwords that the user is allowed to select...

  19. Authenticity and its Contemporary Challenges

    DEFF Research Database (Denmark)

    Bork Petersen, Franziska

    2013-01-01

    In this thesis I investigate what ‘authenticity’ means in a contemporary popular context and how it is used in the staging of bodies. Furthermore, I analyse works of dance and fashion from the past fifteen years with a focus on their strategies of challenging the notion of ‘bodily authenticity...... self’. I scrutinise the staging techniques and the codes of appearance that bodies have to comply with in order to be deemed ‘authentic’ on the shows. To define them and place them in the history of the idea of ‘bodily authenticity’, I complement my study with an outline of how ‘authenticity...... and by a depiction of 'working hard'. But various techniques also mask the hard work, for example by showing a participant ‘having fun’ performing it. Contemporary works of dance and fashion challenge the problematic implications in the notion of ‘bodily authenticity’. I analyse three strategies of undermining...

  20. Digital image authentication from thumbnails

    Science.gov (United States)

    Kee, Eric; Farid, Hany

    2010-01-01

    We describe how to exploit the formation and storage of an embedded image thumbnail for image authentication. The creation of a thumbnail is modeled with a series of filtering operations, contrast adjustment, and compression. We automatically estimate these model parameters and show that these parameters differ significantly between camera manufacturers and photo-editing software. We also describe how this signature can be combined with encoding information from the underlying full resolution image to further refine the signature's distinctiveness.

  1. Persistent Authentication in Smart Environments

    DEFF Research Database (Denmark)

    Hansen, Mads Syska; Kirschmeyer, Martin; Jensen, Christian D.

    2008-01-01

    present a proof-of-concept implementation of the proposed mechanism, which employs camera based tracking with a single stationary 3D camera that uses the "time of flight" principle. A preliminary evaluation of the proposed mechanism indicates that persistent authentication is technically possible...... with the proposed hardware. The proposed model is sufficiently general to allow the addition of more cameras or supplemental tracking technologies, which will improve the robustness and scalability of the proposed mechanism....

  2. National Authentication Framework Implementation Study

    Science.gov (United States)

    2009-12-01

    Identifiers RA Registration Authority SAML Security Assertion Markup Language SFA Single-factor Authentication SMS Short Messaging System SOA ...Internet 2.0 and the growing interest in systems developed based upon the Service- Oriented Architecture ( SOA ). While core specifications upon which...August 2009. [4] S. Harris, CISSP: Exam Guide, 4th ed., New York: McGraw-Hill, 2008, pp. 1145. [5] J. Brainard, A. Juels, R. L. Rivest, M. Szydlo

  3. Multi-Factor Authentication: A Survey

    Directory of Open Access Journals (Sweden)

    Aleksandr Ometov

    2018-01-01

    Full Text Available Today, digitalization decisively penetrates all the sides of the modern society. One of the key enablers to maintain this process secure is authentication. It covers many different areas of a hyper-connected world, including online payments, communications, access right management, etc. This work sheds light on the evolution of authentication systems towards Multi-Factor Authentication (MFA starting from Single-Factor Authentication (SFA and through Two-Factor Authentication (2FA. Particularly, MFA is expected to be utilized for human-to-everything interactions by enabling fast, user-friendly, and reliable authentication when accessing a service. This paper surveys the already available and emerging sensors (factor providers that allow for authenticating a user with the system directly or by involving the cloud. The corresponding challenges from the user as well as the service provider perspective are also reviewed. The MFA system based on reversed Lagrange polynomial within Shamir’s Secret Sharing (SSS scheme is further proposed to enable more flexible authentication. This solution covers the cases of authenticating the user even if some of the factors are mismatched or absent. Our framework allows for qualifying the missing factors by authenticating the user without disclosing sensitive biometric data to the verification entity. Finally, a vision of the future trends in MFA is discussed.

  4. Authenticity assessment of dairy products.

    Science.gov (United States)

    de la Fuente, Miguel Angel; Juárez, Manuela

    2005-01-01

    The authenticity of dairy products has become a focal point, attracting the attention of scientists, producers, consumers, and policymakers. Among many others, some of the practices not allowed in milk and milk products are the substitution of part of the fat or proteins, admixtures of milk of different species, additions of low-cost dairy products (mainly whey derivatives), or mislabeling of products protected by denomination of origin. A range of analytical methods to detect frauds have been developed, modified, and continually reassessed to be one step ahead of manufacturers who pursue these illegal activities. Traditional procedures to assess the authenticity of dairy products include chromatographic, electrophoretic, and immunoenzymatic methods. New approaches such as capillary electrophoresis, polymerase chain reaction, and isotope ratio mass spectrometry have also emerged alongside the latest developments in the former procedures. This work intends to provide an updated and extensive overview since 1991 on the principal applications of all these techniques together with their advantages and disadvantages for detecting the authenticity of dairy products. The scope and limits of different tools are also discussed.

  5. Pathogens and host immunity in the ancient human oral cavity

    Science.gov (United States)

    Warinner, Christina; Matias Rodrigues, João F.; Vyas, Rounak; Trachsel, Christian; Shved, Natallia; Grossmann, Jonas; Radini, Anita; Hancock, Y.; Tito, Raul Y.; Fiddyment, Sarah; Speller, Camilla; Hendy, Jessica; Charlton, Sophy; Luder, Hans Ulrich; Salazar-García, Domingo C.; Eppler, Elisabeth; Seiler, Roger; Hansen, Lars; Samaniego Castruita, José Alfredo; Barkow-Oesterreicher, Simon; Teoh, Kai Yik; Kelstrup, Christian; Olsen, Jesper V.; Nanni, Paolo; Kawai, Toshihisa; Willerslev, Eske; von Mering, Christian; Lewis, Cecil M.; Collins, Matthew J.; Gilbert, M. Thomas P.; Rühli, Frank; Cappellini, Enrico

    2014-01-01

    Calcified dental plaque (dental calculus) preserves for millennia and entraps biomolecules from all domains of life and viruses. We report the first high-resolution taxonomic and protein functional characterization of the ancient oral microbiome and demonstrate that the oral cavity has long served as a reservoir for bacteria implicated in both local and systemic disease. We characterize: (i) the ancient oral microbiome in a diseased state, (ii) 40 opportunistic pathogens, (iii) the first evidence of ancient human-associated putative antibiotic resistance genes, (iv) a genome reconstruction of the periodontal pathogen Tannerella forsythia, (v) 239 bacterial and 43 human proteins, allowing confirmation of a long-term association between host immune factors, “red-complex” pathogens, and periodontal disease, and (vi) DNA sequences matching dietary sources. Directly datable and nearly ubiquitous, dental calculus permits the simultaneous investigation of pathogen activity, host immunity, and diet, thereby extending the direct investigation of common diseases into the human evolutionary past. PMID:24562188

  6. Analysis of ancient silver coins

    International Nuclear Information System (INIS)

    Flament, Christophe; Marchetti, Patrick

    2004-01-01

    Writing from the numismatist point of view, the authors open this paper by reviewing critically the use of scientific methods for the studies of ancient coins. They also report about an application of the PIXE method at low incident proton energy to one of the most celebrated and known coinage in the ancient history: the Athenian silver coins of the fifth century BC. The results of those analyses indicate that the metallic composition of several coins usually taken as ancient imitations of Athenian coins does not differ from that of the genuine ones. Those analyses confirm what the authors have inferred from numismatic sources: These coins are probably genuinely Athenian

  7. Staging constructions of authenticity in organizational change

    DEFF Research Database (Denmark)

    Dupret, Katia

    2018-01-01

    that are emotionally charged. Through a socio-material perspective this paper seeks to explore how change processes in organizations challenges the idea of authentic leadership as a merely individual ability or personality trait and suggest that the authentic leader is distributed into the practices of change......Authenticity in organizations has gained increased focus in recent years. Authentic management and leadership are ways to motivate and make sustainable changes in the organization. But authenticity is also strategically worked with in order to serve social and political functions....... The paper explores how staged organizational change where authentic role-play and scripts from everyday life combined with meta-reflection and feedback construct new forms of reflection where its ethical side-effects should be discussed....

  8. An Examination of Career Indecision and Application to Dispositional Authenticity

    Science.gov (United States)

    White, Nathan J.; Tracey, Terence J. G.

    2011-01-01

    Authenticity has been viewed as a dimension related to life satisfaction, but we propose that authenticity is related to career outcomes. In this study, we examined the relation between authenticity and career indecision. Authenticity was assessed by the Authenticity Scale and it was found to be moderately related to different indices of career…

  9. Authenticity is in the Eye of the Beholder: Student and Teacher Perceptions of Assessment Authenticity.

    NARCIS (Netherlands)

    Gulikers, Judith; Bastiaens, Theo; Kirschner, Paul A.; Kester, Liesbeth

    2008-01-01

    Gulikers, J. T. M., Bastiaens, Th. J., Kirschner, P. A., & Kester, L. (2008). Authenticity is in the Eye of the Beholder: Student and Teacher Perceptions of Assessment Authenticity. Journal of Vocational Education and Training, 60(4)

  10. Ancient and Current Chaos Theories

    Directory of Open Access Journals (Sweden)

    Güngör Gündüz

    2006-07-01

    Full Text Available Chaos theories developed in the last three decades have made very important contributions to our understanding of dynamical systems and natural phenomena. The meaning of chaos in the current theories and in the past is somewhat different from each other. In this work, the properties of dynamical systems and the evolution of chaotic systems were discussed in terms of the views of ancient philosophers. The meaning of chaos in Anaximenes’ philosophy and its role in the Ancient natural philosophy has been discussed in relation to other natural philosophers such as of Anaximander, Parmenides, Heraclitus, Empedocles, Leucippus (i.e. atomists and Aristotle. In addition, the fundamental concepts of statistical mechanics and the current chaos theories were discussed in relation to the views in Ancient natural philosophy. The roots of the scientific concepts such as randomness, autocatalysis, nonlinear growth, information, pattern, etc. in the Ancient natural philosophy were investigated.

  11. Evaluation of the authenticity of a highly novel environmental sequence from boreal forest soil using ribosomal RNA secondary structure modeling

    Science.gov (United States)

    D.J. Glass; N. Takebayashi; L. Olson; D.L. Taylor

    2013-01-01

    The number of sequences from both formally described taxa and uncultured environmental DNA deposited in the International Nucleotide Sequence Databases has increased substantially over the last two decades. Although the majority of these sequences represent authentic gene copies, there is evidence of DNA artifacts in these databases as well. These include lab artifacts...

  12. The Duality of Authenticity in ELT

    OpenAIRE

    Joy, J. John Love

    2011-01-01

    Purpose: This study aims to find out the dual-perspectives on authenticity in English language teaching.Problem: The concept of authenticity has generated quite a ripple in ESL/EFL classrooms. Contrasting perspectives have emerged over the years in reaction to this concept. Some regard authenticity as an inevitable part of teaching as it provides students with opportunities to interact with reality in the classroom itself, whereas, some others consider it an ambitious construct and suggest ap...

  13. Disambiguating authenticity: Interpretations of value and appeal

    OpenAIRE

    O?Connor, Kieran; Carroll, Glenn R.; Kov?cs, Bal?zs

    2017-01-01

    While shaping aesthetic judgment and choice, socially constructed authenticity takes on some very different meanings among observers, consumers, producers and critics. Using a theoretical framework positing four distinct meanings of socially constructed authenticity-type, moral, craft, and idiosyncratic-we aim to document empirically the unique appeal of each type. We develop predictions about the relationships between attributed authenticity and corresponding increases in the value ascribed ...

  14. A Review Of Multimodal Biometric Authentication Systems

    Directory of Open Access Journals (Sweden)

    Kunal Kumar

    2015-08-01

    Full Text Available Authentication is the process of validating the identity of a person based on certain input that the person provides. Authentication has become a major topic of research due to the increasing number of attacks on computer networks around the globe. This review paper focuses on multimodal biometric authentication systems in use today. The aim is to elicit the best combination of authentication factors for multimodal use. We study the strengths and weakness of selected biometric mechanisms and recommend novel solutions to include in multimodal biometric systems to improve on the current biometric drawbacks. We believe this paper will provide security researchers some useful insight whilst designing better biometric systems.

  15. User Authentication in Smartphones for Telehealth

    Science.gov (United States)

    SMITH, KATHERINE A.; ZHOU, LEMING; WATZLAF, VALERIE J. M.

    2017-01-01

    Many functions previously conducted on desktop computers are now performed on smartphones. Smartphones provide convenience, portability, and connectivity. When smartphones are used in the conduct of telehealth, sensitive data is invariably accessed, rendering the devices in need of user authentication to ensure data protection. User authentication of smartphones can help mitigate potential Health Insurance Portability and Accountability Act (HIPAA) breaches and keep sensitive patient information protected, while also facilitating the convenience of smartphones within everyday life and healthcare. This paper presents and examines several types of authentication methods available to smartphone users to help ensure security of sensitive data from attackers. The applications of these authentication methods in telehealth are discussed. PMID:29238444

  16. SNP marker analysis for validating the authenticity of Tunisian olive oil

    Indian Academy of Sciences (India)

    The other. SNP, called SOD, is an insertion/deletion polymorphism type localized in Cu–Zn superoxide dismutase gene which is involved in the oxidative stress, one of .... Authenticity of olive oil by SNP markers. Table 1. Characteristics of SNP markers used for DNA amplification. Size of. SNP amplicon. Gene name. SNPs.

  17. Authenticity Lies in the Eye of the Beholder The Perception of Teachers' Authenticity by their Students

    NARCIS (Netherlands)

    De Bruyckere, Pedro

    2018-01-01

    Everything and everybody is urged to be authentic. Brands now need to create authentic experiences in music, artists survive if they are perceived as being real and nowadays, even in political elections, the perception of authenticity is an issue, certainly in the 2016 elections in the United

  18. High Resolution Melting (HRM) applied to wine authenticity.

    Science.gov (United States)

    Pereira, Leonor; Gomes, Sónia; Castro, Cláudia; Eiras-Dias, José Eduardo; Brazão, João; Graça, António; Fernandes, José R; Martins-Lopes, Paula

    2017-02-01

    Wine authenticity methods are in increasing demand mainly in Denomination of Origin designations. The DNA-based methodologies are a reliable means of tracking food/wine varietal composition. The main aim of this work was the study of High Resolution Melting (HRM) application as a screening method for must and wine authenticity. Three sample types (leaf, must and wine) were used to validate the three developed HRM assays (Vv1-705bp; Vv2-375bp; and Vv3-119bp). The Vv1 HRM assay was only successful when applied to leaf and must samples. The Vv2 HRM assay successfully amplified all sample types, allowing genotype discrimination based on melting temperature values. The smallest amplicon, Vv3, produced a coincident melting curve shape in all sample types (leaf and wine) with corresponding genotypes. This study presents sensitive, rapid and efficient HRM assays applied for the first time to wine samples suitable for wine authenticity purposes. Copyright © 2016 Elsevier Ltd. All rights reserved.

  19. Parallelizable and Authenticated Online Ciphers

    DEFF Research Database (Denmark)

    Andreeva, Elena; Bogdanov, Andrey; Luykx, Atul

    2013-01-01

    -purpose CPUs or dedicated hardware.We propose the first parallelizable online cipher, COPE. It performs two calls to the underlying block cipher per plaintext block and is fully parallelizable in both encryption and decryption. COPE is proven secure against chosenplaintext attacks assuming the underlying block...... cipher is a strong PRP. We then extend COPE to create COPA, the first parallelizable, online authenticated cipher with nonce-misuse resistance. COPA only requires two extra block cipher calls to provide integrity. The privacy and integrity of the scheme is proven secure assuming the underlying block...

  20. Mitochondrial phylogenomics of modern and ancient equids.

    Science.gov (United States)

    Vilstrup, Julia T; Seguin-Orlando, Andaine; Stiller, Mathias; Ginolhac, Aurelien; Raghavan, Maanasa; Nielsen, Sandra C A; Weinstock, Jacobo; Froese, Duane; Vasiliev, Sergei K; Ovodov, Nikolai D; Clary, Joel; Helgen, Kristofer M; Fleischer, Robert C; Cooper, Alan; Shapiro, Beth; Orlando, Ludovic

    2013-01-01

    The genus Equus is richly represented in the fossil record, yet our understanding of taxonomic relationships within this genus remains limited. To estimate the phylogenetic relationships among modern horses, zebras, asses and donkeys, we generated the first data set including complete mitochondrial sequences from all seven extant lineages within the genus Equus. Bayesian and Maximum Likelihood phylogenetic inference confirms that zebras are monophyletic within the genus, and the Plains and Grevy's zebras form a well-supported monophyletic group. Using ancient DNA techniques, we further characterize the complete mitochondrial genomes of three extinct equid lineages (the New World stilt-legged horses, NWSLH; the subgenus Sussemionus; and the Quagga, Equus quagga quagga). Comparisons with extant taxa confirm the NWSLH as being part of the caballines, and the Quagga and Plains zebras as being conspecific. However, the evolutionary relationships among the non-caballine lineages, including the now-extinct subgenus Sussemionus, remain unresolved, most likely due to extremely rapid radiation within this group. The closest living outgroups (rhinos and tapirs) were found to be too phylogenetically distant to calibrate reliable molecular clocks. Additional mitochondrial genome sequence data, including radiocarbon dated ancient equids, will be required before revisiting the exact timing of the lineage radiation leading up to modern equids, which for now were found to have possibly shared a common ancestor as far as up to 4 Million years ago (Mya).

  1. Mitochondrial phylogenomics of modern and ancient equids.

    Directory of Open Access Journals (Sweden)

    Julia T Vilstrup

    Full Text Available The genus Equus is richly represented in the fossil record, yet our understanding of taxonomic relationships within this genus remains limited. To estimate the phylogenetic relationships among modern horses, zebras, asses and donkeys, we generated the first data set including complete mitochondrial sequences from all seven extant lineages within the genus Equus. Bayesian and Maximum Likelihood phylogenetic inference confirms that zebras are monophyletic within the genus, and the Plains and Grevy's zebras form a well-supported monophyletic group. Using ancient DNA techniques, we further characterize the complete mitochondrial genomes of three extinct equid lineages (the New World stilt-legged horses, NWSLH; the subgenus Sussemionus; and the Quagga, Equus quagga quagga. Comparisons with extant taxa confirm the NWSLH as being part of the caballines, and the Quagga and Plains zebras as being conspecific. However, the evolutionary relationships among the non-caballine lineages, including the now-extinct subgenus Sussemionus, remain unresolved, most likely due to extremely rapid radiation within this group. The closest living outgroups (rhinos and tapirs were found to be too phylogenetically distant to calibrate reliable molecular clocks. Additional mitochondrial genome sequence data, including radiocarbon dated ancient equids, will be required before revisiting the exact timing of the lineage radiation leading up to modern equids, which for now were found to have possibly shared a common ancestor as far as up to 4 Million years ago (Mya.

  2. Did the ancient Egyptians migrate to ancient Nigeria?

    Directory of Open Access Journals (Sweden)

    Jock M. Agai

    2014-01-01

    Full Text Available Literatures concerning the history of West African peoples published from 1900 to 1970 debate�the possible migrations of the Egyptians into West Africa. Writers like Samuel Johnson and�Lucas Olumide believe that the ancient Egyptians penetrated through ancient Nigeria but Leo�Frobenius and Geoffrey Parrinder frowned at this opinion. Using the works of these early�20th century writers of West African history together with a Yoruba legend which teaches�about the origin of their earliest ancestor(s, this researcher investigates the theories that the�ancient Egyptians had contact with the ancient Nigerians and particularly with the Yorubas.Intradisciplinary and/or interdisciplinary implications: There is an existing ideology�amongst the Yorubas and other writers of Yoruba history that the original ancestors of�the Yorubas originated in ancient Egypt hence there was migration between Egypt and�Yorubaland. This researcher contends that even if there was migration between Egypt and�Nigeria, such migration did not take place during the predynastic and dynastic period as�speculated by some scholars. The subject is open for further research.

  3. The Ancient Evolutionary History of Polyomaviruses.

    Directory of Open Access Journals (Sweden)

    Christopher B Buck

    2016-04-01

    Full Text Available Polyomaviruses are a family of DNA tumor viruses that are known to infect mammals and birds. To investigate the deeper evolutionary history of the family, we used a combination of viral metagenomics, bioinformatics, and structural modeling approaches to identify and characterize polyomavirus sequences associated with fish and arthropods. Analyses drawing upon the divergent new sequences indicate that polyomaviruses have been gradually co-evolving with their animal hosts for at least half a billion years. Phylogenetic analyses of individual polyomavirus genes suggest that some modern polyomavirus species arose after ancient recombination events involving distantly related polyomavirus lineages. The improved evolutionary model provides a useful platform for developing a more accurate taxonomic classification system for the viral family Polyomaviridae.

  4. Continuous user authentication using temporal information

    Science.gov (United States)

    Niinuma, Koichiro; Jain, Anil K.

    2010-04-01

    Conventional computer systems authenticate users only at the initial log-in session, which can be the cause of a critical security flaw. To resolve this problem, systems need continuous user authentication methods that continuously monitor and authenticate users based on some biometric trait(s). We propose a new method for continuous user authentication based on a Webcam that monitors a logged in user's face and color of clothing. Our method can authenticate users regardless of their posture in front of the workstation (laptop or PC). Previous methods for continuous user authentication cannot authenticate users without biometric observation. To alleviate this requirement, our method uses color information of users' clothing as an enrollment template in addition to their face information. The system cannot pre-register the clothing color information because this information is not permanent. To deal with the problem, our system automatically registers this information every time the user logs in and then fuses it with the conventional (password) identification system. We report preliminary authentication results and future enhancements to the proposed system.

  5. Enhancing Authentication Models Characteristic Metrics via ...

    African Journals Online (AJOL)

    In this work, we derive the universal characteristic metrics set for authentication models based on security, usability and design issues. We then compute the probability of the occurrence of each characteristic metrics in some single factor and multifactor authentication models in order to determine the effectiveness of these ...

  6. Ignoring Authentic African Literature Means Ignoring Africans

    Science.gov (United States)

    Romano, Carlin

    2005-01-01

    Africa produces imaginative and authentic literature whose texture makes it impossible to think of Africans as statistics. African writers, however have to struggle to get recognized in America due to their culture and other racial and social differences, hence suggesting that efforts should be made to give authentic African literature its due.

  7. Making it Real: Authenticity, Process and Pedagogy

    Science.gov (United States)

    Badger, Richard; MacDonald, Malcolm

    2010-01-01

    Authenticity has been a part of the intellectual resources of language teaching since the 1890s but its precise meaning and implications are contested. This commentary argues for a view of authenticity which recognizes the limits of the concept as a guide for pedagogic practice and acknowledges the fact that texts are processes rather than…

  8. Test-Task Authenticity: The Multiple Perspectives

    Science.gov (United States)

    Gan, Zhengdong

    2012-01-01

    Leung and Lewkowicz remind us that the debate over the past two decades that is most relevant to ELT (English languge teaching) pedagogy and curriculum concerns test-task authenticity. This paper first reviews how the authenticity debate in the literature of second language acquisition, pedagogy and testing has evolved. Drawing on a body of…

  9. Key Recovery Attacks on Recent Authenticated Ciphers

    DEFF Research Database (Denmark)

    Bogdanov, Andrey; Dobraunig, Christoph; Eichlseder, Maria

    2014-01-01

    In this paper, we cryptanalyze three authenticated ciphers: AVALANCHE, Calico, and RBS. While the former two are contestants in the ongoing international CAESAR competition for authenticated encryption schemes, the latter has recently been proposed for lightweight applications such as RFID systems...

  10. The importance of studying inherited hematological disorders in ancient Anatolian populations

    Directory of Open Access Journals (Sweden)

    Yeşim Doğan Alakoç

    2011-12-01

    Full Text Available Before analysis of DNA from ancient remains was possible, anthropologists studied evolution and migration patterns using data obtained from population genetic studies on modern populations combined with data obtained from morphological evaluations of ancient remains. Currently, DNA analysis of ancient populations is making a valuable contribution to these efforts. Researchers that perform ancient DNA analysis prefer to study polymorphisms on the Y chromosome or mitochondrial DNA because the results are easier to statistically evaluate. To evaluate polymorphisms on diploid genomes, which are more informative, only mutations that have been extensively examined in modern populations should be chosen. The most extensively evaluated mutations are those related to prevalent inherited disorders. As such, beta-thalassemia, sickle cell anemia, FVL mutation of globin and the factor V genes are good candidates for DNA studies in ancient populations. These mutations are common in Anatolia, host to many civilizations since the Paleolithic period. This history makes Anatolia a good place for conducting research that could enhance our understanding of human evolution and migration patterns.

  11. The Duality of Authenticity in ELT

    Directory of Open Access Journals (Sweden)

    J. John Love Joy

    2011-11-01

    Full Text Available Purpose: This study aims to find out the dual-perspectives on authenticity in English language teaching.Problem: The concept of authenticity has generated quite a ripple in ESL/EFL classrooms. Contrasting perspectives have emerged over the years in reaction to this concept. Some regard authenticity as an inevitable part of teaching as it provides students with opportunities to interact with reality in the classroom itself, whereas, some others consider it an ambitious construct and suggest approaching it with caution.Method: In order to verify these perspectives, a survey of literature has been done to trace the genesis of authenticity and its various facets.Conclusion: As a result, we have found that a balanced outlook on authenticity is required by the teachers to promote better teaching-learning experiences.

  12. User Authentication in Smartphones for Telehealth

    Directory of Open Access Journals (Sweden)

    Katherine A. Smith

    2017-11-01

    Full Text Available Many functions previously conducted on desktop computers are now performed on smartphones. Smartphones provide convenience, portability, and connectivity.  When smartphones are used in the conduct of telehealth, sensitive data is invariably accessed, rendering the devices in need of user authentication to ensure data protection. User authentication of smartphones can help mitigate potential Health Insurance Portability and Accountability Act (HIPAA breaches and keep sensitive patient information protected, while also facilitating the convenience of smartphones within everyday life and healthcare. This paper presents and examines several types of authentication methods available to smartphone users to help ensure security of sensitive data from attackers. The applications of these authentication methods in telehealth are discussed.  Keywords: Authentication, Biometrics, HIPAA, Mobile security, Telehealth

  13. Remote Biometrics for Robust Persistent Authentication

    DEFF Research Database (Denmark)

    Ingwar, Mads Ingerslew; Jensen, Christian D.

    2014-01-01

    .g., through a smart card based access control system, to the location where the authentication is required by a location-based service. The PAISE model is extended with remote biometrics to prevent the decay of authentication confidence when authenticated users encounter and interact with other users...... in the environment. The result is a calm approach to authentication, where mobile users are transparently authenticated towards the system, which allows the provision of location-based services. The output of the remote biometrics are fused using error-rate-based fusion to solve a common problem that occurs in score...... level fusion, i.e., the scores of each biometric system are usually incompatible, as they have different score ranges as well as different probability distributions. We have integrated remote biometrics with the PAISE prototype and the experimental results on a publicly available dataset, show...

  14. Biological Sexing of a 4000-Year-Old Egyptian Mummy Head to Assess the Potential of Nuclear DNA Recovery from the Most Damaged and Limited Forensic Specimens.

    Science.gov (United States)

    Loreille, Odile; Ratnayake, Shashikala; Bazinet, Adam L; Stockwell, Timothy B; Sommer, Daniel D; Rohland, Nadin; Mallick, Swapan; Johnson, Philip L F; Skoglund, Pontus; Onorato, Anthony J; Bergman, Nicholas H; Reich, David; Irwin, Jodi A

    2018-03-01

    High throughput sequencing (HTS) has been used for a number of years in the field of paleogenomics to facilitate the recovery of small DNA fragments from ancient specimens. Recently, these techniques have also been applied in forensics, where they have been used for the recovery of mitochondrial DNA sequences from samples where traditional PCR-based assays fail because of the very short length of endogenous DNA molecules. Here, we describe the biological sexing of a ~4000-year-old Egyptian mummy using shotgun sequencing and two established methods of biological sex determination (R X and R Y ), by way of mitochondrial genome analysis as a means of sequence data authentication. This particular case of historical interest increases the potential utility of HTS techniques for forensic purposes by demonstrating that data from the more discriminatory nuclear genome can be recovered from the most damaged specimens, even in cases where mitochondrial DNA cannot be recovered with current PCR-based forensic technologies. Although additional work remains to be done before nuclear DNA recovered via these methods can be used routinely in operational casework for individual identification purposes, these results indicate substantial promise for the retrieval of probative individually identifying DNA data from the most limited and degraded forensic specimens.

  15. Biological Sexing of a 4000-Year-Old Egyptian Mummy Head to Assess the Potential of Nuclear DNA Recovery from the Most Damaged and Limited Forensic Specimens

    Directory of Open Access Journals (Sweden)

    Odile Loreille

    2018-03-01

    Full Text Available High throughput sequencing (HTS has been used for a number of years in the field of paleogenomics to facilitate the recovery of small DNA fragments from ancient specimens. Recently, these techniques have also been applied in forensics, where they have been used for the recovery of mitochondrial DNA sequences from samples where traditional PCR-based assays fail because of the very short length of endogenous DNA molecules. Here, we describe the biological sexing of a ~4000-year-old Egyptian mummy using shotgun sequencing and two established methods of biological sex determination (RX and RY, by way of mitochondrial genome analysis as a means of sequence data authentication. This particular case of historical interest increases the potential utility of HTS techniques for forensic purposes by demonstrating that data from the more discriminatory nuclear genome can be recovered from the most damaged specimens, even in cases where mitochondrial DNA cannot be recovered with current PCR-based forensic technologies. Although additional work remains to be done before nuclear DNA recovered via these methods can be used routinely in operational casework for individual identification purposes, these results indicate substantial promise for the retrieval of probative individually identifying DNA data from the most limited and degraded forensic specimens.

  16. Tuberculosis in ancient times

    Directory of Open Access Journals (Sweden)

    Louise Cilliers

    2008-09-01

    Full Text Available In spite of an array of effective antibiotics, tuberculosis is still very common in developing countries where overcrowding, malnutrition and poor hygienic conditions prevail. Over the past 30 years associated HIV infection has worsened the situation by increasing the infection rate and mortality of tuberculosis. Of those diseases caused by a single organism only HIV causes more deaths internationally than tuberculosis. The tubercle bacillus probably first infected man in Neolithic times, and then via infected cattle, but the causative Mycobacteriacea have been in existence for 300 million years. Droplet infection is the most common way of acquiring tuberculosis, although ingestion (e.g. of infected cows’ milk may occur. Tuberculosis probably originated in Africa. The earliest path gnomonic evidence of human tuberculosis in man was found in osteo-archaeological findings of bone tuberculosis (Pott’s disease of the spine in the skeleton of anEgyptian priest from the 21st Dynasty (approximately 1 000 BC. Suggestive but not conclusiveevidence of tuberculotic lesions had been found in even earlier skeletons from Egypt and Europe. Medical hieroglyphics from ancient Egypt are silent on the disease, which could be tuberculosis,as do early Indian and Chinese writings. The Old Testament refers to the disease schachapeth, translated as phthisis in the Greek Septuagint. Although the Bible is not specific about this condition, tuberculosis is still called schachapeth in modern Hebrew. In pre-Hippocratic Greece Homer did not mention phthisis, a word meaning non-specific wasting of the body. However. Alexander of Tralles (6th century BC seemed to narrow the concept down to a specific disease, and in the Hippocratic Corpus (5th-4th centuries BC phthisis can be recognised as tuberculosis. It was predominantly a respiratory disease commonly seen and considered to be caused by an imbalance of bodily humours. It was commonest in autumn, winter and spring

  17. Repetitive transpositions of mitochondrial DNA sequences to the nucleus during the radiation of horseshoe bats (Rhinolophus, Chiroptera).

    Science.gov (United States)

    Shi, Huizhen; Dong, Ji; Irwin, David M; Zhang, Shuyi; Mao, Xiuguang

    2016-05-01

    Transposition of mitochondrial DNA into the nucleus, which gives rise to nuclear mitochondrial DNAs (NUMTs), has been well documented in eukaryotes. However, very few studies have assessed the frequency of these transpositions during the evolutionary history of a specific taxonomic group. Here we used the horseshoe bats (Rhinolophus) as a case study to determine the frequency and relative timing of nuclear transfers of mitochondrial control region sequences. For this, phylogenetic and coalescent analyzes were performed on NUMTs and authentic mtDNA sequences generated from eight horseshoe bat species. Our results suggest at least three independent transpositions, including two ancient and one more recent, during the evolutionary history of Rhinolophus. The two ancient transpositions are represented by the NUMT-1 and -2 clades, with each clade consisting of NUMTs from almost all studied species but originating from different portions of the mtDNA genome. Furthermore, estimates of the most recent common ancestor for each clade corresponded to the time of the initial diversification of this genus. The recent transposition is represented by NUMT-3, which was discovered only in a specific subgroup of Rhinolophus and exhibited a close relationship to its mitochondrial counterpart. Our similarity searches of mtDNA in the R. ferrumequinum genome confirmed the presence of NUMT-1 and NUMT-2 clade sequences and, for the first time, assessed the extent of NUMTs in a bat genome. To our knowledge, this is the first study to report on the frequency of transpositions of mtDNA occurring before the common ancestry of a genus. Copyright © 2016 Elsevier B.V. All rights reserved.

  18. Proteomics for the authentication of fish species.

    Science.gov (United States)

    Mazzeo, Maria Fiorella; Siciliano, Rosa Anna

    2016-09-16

    Assessment of seafood authenticity and origin, mainly in the case of processed products (fillets, sticks, baby food) represents the crucial point to prevent fraudulent deceptions thus guaranteeing market transparency and consumers health. The most dangerous practice that jeopardies fish safety is intentional or unintentional mislabeling, originating from the substitution of valuable fish species with inferior ones. Conventional analytical methods for fish authentication are becoming inadequate to comply with the strict regulations issued by the European Union and with the increase of mislabeling due to the introduction on the market of new fish species and market globalization. This evidence prompts the development of high-throughput approaches suitable to identify unambiguous biomarkers of authenticity and screen a large number of samples with minimal time consumption. Proteomics provides suitable and powerful tools to investigate main aspects of food quality and safety and has given an important contribution in the field of biomarkers discovery applied to food authentication. This report describes the most relevant methods developed to assess fish identity and offers a perspective on their potential in the evaluation of fish quality and safety thus depicting the key role of proteomics in the authentication of fish species and processed products. The assessment of fishery products authenticity is a main issue in the control quality process as deceptive practices could imply severe health risks. Proteomics based methods could significantly contribute to detect falsification and frauds, thus becoming a reliable operative first-line testing resource in food authentication. Copyright © 2016 Elsevier B.V. All rights reserved.

  19. Image content authentication based on channel coding

    Science.gov (United States)

    Zhang, Fan; Xu, Lei

    2008-03-01

    The content authentication determines whether an image has been tampered or not, and if necessary, locate malicious alterations made on the image. Authentication on a still image or a video are motivated by recipient's interest, and its principle is that a receiver must be able to identify the source of this document reliably. Several techniques and concepts based on data hiding or steganography designed as a means for the image authentication. This paper presents a color image authentication algorithm based on convolution coding. The high bits of color digital image are coded by the convolution codes for the tamper detection and localization. The authentication messages are hidden in the low bits of image in order to keep the invisibility of authentication. All communications channels are subject to errors introduced because of additive Gaussian noise in their environment. Data perturbations cannot be eliminated but their effect can be minimized by the use of Forward Error Correction (FEC) techniques in the transmitted data stream and decoders in the receiving system that detect and correct bits in error. This paper presents a color image authentication algorithm based on convolution coding. The message of each pixel is convolution encoded with the encoder. After the process of parity check and block interleaving, the redundant bits are embedded in the image offset. The tamper can be detected and restored need not accessing the original image.

  20. Perfumed historic buildings: Issues of authenticity

    Directory of Open Access Journals (Sweden)

    Tošić Jovana

    2016-01-01

    Full Text Available Contemporary historical preservation practice includes olfactory preservation as an experimental method of architectural preservation. The implementation of manufactured scents in historic buildings raises important issues of authenticity. This paper focuses on three important issues in the relation between olfactory preservation and authenticity: the importance of phenomenology in memory evocation; the relative character of the authenticity concept; and the significance of social values in historic preservation. This requires a critical examination of charters, documents and theoretical interpretations which reflect a broader concept of authenticity. The paper discusses certain articles of the Venice Charter, the Nara Document on Authenticity, as well as the sense of smell in architectural experience through critical analysis of the theories of John Ruskin, Viollet-le-Duc, Roger Scruton and Juhani Pallasmaa and their concepts of authenticity. Authenticity issues are illustrated by the examples of olfactory preservation: olfactory reconstruction of Philip Johnson’s Glass House; interior restoration and olfactory reconstruction of the Arts Club in Mayfair, London; and the creation process of the perfume brand Arquiste, a meaningful example which relocates the olfactory reconstruction context. These critical analyses raise the question of scent in historic buildings as a value in itself.

  1. Single gene retrieval from thermally degraded DNA

    Indian Academy of Sciences (India)

    To simulate single gene retrieval from ancient DNA, several related factors have been investigated. By monitoring a 889 bp polymerase chain reaction (PCR) product and genomic DNA degradation, we find that heat and oxygen (especially heat) are both crucial factors influencing DNA degradation. The heat influence ...

  2. Authentication of Fish Products by Large-Scale Comparison of Tandem Mass Spectra

    DEFF Research Database (Denmark)

    Wulff, Tune; Nielsen, Michael Engelbrecht; Deelder, André M.

    2013-01-01

    Authentication of food is a major concern worldwide to ensure that food products are correctly labeled in terms of which animals are actually processed for consumption. Normally authentication is based on species recognition by comparison of selected sequences of DNA or protein. We here present...... a new robust, proteome-wide tandem mass spectrometry method for species recognition and food product authentication. The method does not use or require any genome sequences or selection of tandem mass spectra but uses all acquired data. The experimental steps were performed in a simple, standardized...... workflow including protein extraction, digestion, and data analysis. First, a set of reference spectral libraries was generated using unprocessed muscle tissue from 22 different fish species. Query tandem mass spectrometry data sets from “unknown” fresh muscle tissue samples were then searched against...

  3. Data Authentication Demonstration for Radionuclide Stations

    Energy Technology Data Exchange (ETDEWEB)

    Harris, Mark; Herrington, Pres; Miley, Harry; Ellis, J. Edward; McKinnon, David; St. Pierre, Devon

    1999-08-03

    Data authentication is required for certification of sensor stations in the International Monitoring System (IMS). Authentication capability has been previously demonstrated for continuous waveform stations (seismic and infrasound). This paper addresses data surety for the radionuclide stations in the IMS, in particular the Radionuclide Aerosol Sampler/Analyzer (RASA) system developed by Pacific Northwest National Laboratory (PNNL). Radionuclide stations communicate data by electronic mail using formats defined in IMS 1.0, Formats and Protocols for Messages. An open message authentication standard exists, called S/MIME (Secure/Multipurpose Internet Mail Extensions), which has been proposed for use with all IMS radionuclide station message communications. This standard specifies adding a digital signature and public key certificate as a MIME attachment to the e-mail message. It is advantageous because it allows authentication to be added to all IMS 1.0 messages in a standard format and is commercially supported in e-mail software. For command and control, the RASA system uses a networked Graphical User Interface (GUI) based upon Common Object Request Broker Architecture (CORBA) communications, which requires special authentication procedures. The authors have modified the RASA system to meet CTBTO authentication guidelines, using a FORTEZZA card for authentication functions. They demonstrated signing radionuclide data messages at the RASA, then sending, receiving, and verifying the messages at a data center. They demonstrated authenticating command messages and responses from the data center GUI to the RASA. Also, the particular authentication system command to change the private/public key pair and retrieve the new public key was demonstrated. This work shows that data surety meeting IMS guidelines may be immediately applied to IMS radionuclide systems.

  4. Ancient medicine--a review.

    Science.gov (United States)

    Zuskin, Eugenija; Lipozencić, Jasna; Pucarin-Cvetković, Jasna; Mustajbegović, Jadranka; Schachter, Neil; Mucić-Pucić, Branka; Neralić-Meniga, Inja

    2008-01-01

    Different aspects of medicine and/or healing in several societies are presented. In the ancient times as well as today medicine has been closely related to magic, science and religion. Various ancient societies and cultures had developed different views of medicine. It was believed that a human being has two bodies: a visible body that belongs to the earth and an invisible body of heaven. In the earliest prehistoric days, a different kind of medicine was practiced in countries such as Egypt, Greece, Rome, Mesopotamia, India, Tibet, China, and others. In those countries, "medicine people" practiced medicine from the magic to modern physical practices. Medicine was magical and mythological, and diseases were attributed mostly to the supernatural forces. The foundation of modern medicine can be traced back to ancient Greeks. Tibetan culture, for instance, even today, combines spiritual and practical medicine. Chinese medicine developed as a concept of yin and yang, acupuncture and acupressure, and it has even been used in the modern medicine. During medieval Europe, major universities and medical schools were established. In the ancient time, before hospitals had developed, patients were treated mostly in temples.

  5. Ancient woodland boundaries in Europe

    Czech Academy of Sciences Publication Activity Database

    Szabó, Péter

    2010-01-01

    Roč. 36, č. 2 (2010), s. 205-214 ISSN 0305-7488 R&D Projects: GA AV ČR IAA600050812 Institutional research plan: CEZ:AV0Z60050516 Keywords : ancient woodland * historical ecology * landscape archaeology Subject RIV: EF - Botanics Impact factor: 0.983, year: 2010

  6. The ancient art of memory.

    Science.gov (United States)

    Hobson, Allan

    2013-12-01

    Revision of Freud's theory requires a new way of seeking dream meaning. With the idea of elaborative encoding, Sue Llewellyn has provided a method of dream interpretation that takes into account both modern sleep science and the ancient art of memory. Her synthesis is elegant and compelling. But is her hypothesis testable?

  7. The Echoes of Ancient Humans

    Science.gov (United States)

    Watzman, Haim

    2006-01-01

    Several artifacts found at the Gesher Benot Ya'aqov, or Daughters of Jacob Bridge, archaeological site in Israel provide a picture of ancient human ancestors that is different from the once accepted by most scholars. The discoveries by Israeli archaeologist Naama Goren-Inbar suggest that humans developed language and other key abilities far…

  8. Towards distortion-free robust image authentication

    International Nuclear Information System (INIS)

    Coltuc, D

    2007-01-01

    This paper investigates a general framework for distortion-free robust image authentication by multiple marking. First, by robust watermarking a subsampled version of image edges is embedded. Then, by reversible watermarking the information needed to recover the original image is inserted, too. The hiding capacity of the reversible watermarking is the essential requirement for this approach. Thus in case of no attacks not only image is authenticated but also the original is exactly recovered. In case of attacks, reversibility is lost, but image can still be authenticated. Preliminary results providing very good robustness against JPEG compression are presented

  9. Staging constructions of authenticity in organizational change

    DEFF Research Database (Denmark)

    Dupret, Katia

    2018-01-01

    that are emotionally charged. Through a socio-material perspective this paper seeks to explore how change processes in organizations challenges the idea of authentic leadership as a merely individual ability or personality trait and suggest that the authentic leader is distributed into the practices of change....... The paper explores how staged organizational change where authentic role-play and scripts from everyday life combined with meta-reflection and feedback construct new forms of reflection where its ethical side-effects should be discussed....

  10. Instant Java password and authentication security

    CERN Document Server

    Mayoral, Fernando

    2013-01-01

    Filled with practical, step-by-step instructions and clear explanations for the most important and useful tasks. This book takes a hands-on approach to Java-based password hashing and authentication, detailing advanced topics in a recipe format.This book is ideal for developers new to user authentication and password security, and who are looking to get a good grounding in how to implement it in a reliable way.It's assumed that the reader will have some experience in Java already, as well as being familiar with the basic idea behind user authentication.

  11. Authenticated communication from quantum readout of PUFs

    Science.gov (United States)

    Škorić, Boris; Pinkse, Pepijn W. H.; Mosk, Allard P.

    2017-08-01

    Quantum readout of physical unclonable functions (PUFs) is a recently introduced method for remote authentication of objects. We present an extension of the protocol to enable the authentication of data: A verifier can check if received classical data were sent by the PUF holder. We call this modification QR-d or, in the case of the optical-PUF implementation, QSA-d. We discuss how QSA-d can be operated in a parallel way. We also present a protocol for authenticating quantum states.

  12. Authentic And Concurrent Evaluation-refining

    DEFF Research Database (Denmark)

    Eriksson, Carina Ihlström; Åkesson, Maria; Kautz, Karlheinz

    2011-01-01

    This paper addresses the need for more detailed accounts for evaluation in design science research literature. By revisiting a design project regarding the future e-newspaper we give detailed descriptions of its authentic and concurrent evaluation approach by illustrating the what, why and how...... as well as decisions on strategic levels. We emphasize a holistic and concurrent approach to evaluation compared to the general design science research thinking and argue that reflecting on how to seek authenticity is important. By authenticity we refer to the notion of how closely an evaluation captures...

  13. The eye and its diseases in Ancient Egypt

    DEFF Research Database (Denmark)

    Andersen, S. Ry

    1997-01-01

    Ophthalmology, History of ophthalmology, eyes in the Ancient Egypt, eye disease in Ancient Egypt, porotic hyperostosis, mummification......Ophthalmology, History of ophthalmology, eyes in the Ancient Egypt, eye disease in Ancient Egypt, porotic hyperostosis, mummification...

  14. Final report for the network authentication investigation and pilot.

    Energy Technology Data Exchange (ETDEWEB)

    Eldridge, John M.; Dautenhahn, Nathan; Miller, Marc M.; Wiener, Dallas J; Witzke, Edward L.

    2006-11-01

    New network based authentication mechanisms are beginning to be implemented in industry. This project investigated different authentication technologies to see if and how Sandia might benefit from them. It also investigated how these mechanisms can integrate with the Sandia Two-Factor Authentication Project. The results of these investigations and a network authentication path forward strategy are documented in this report.

  15. Ancient and Modern Coins Unit Plans.

    Science.gov (United States)

    United States Mint (Dept. of Treasury), Washington, DC.

    Ancient times comes to life when a student can hold in his/her hand or read about an artifact, such as a coin of the Greek or Roman era. Students are familiar with coins, and this commonality helps them understand the similarities and differences between their lives and times in ancient Greece or Rome. Many symbols on the ancient coins can be…

  16. Quality standards in Biobanking: authentication by genetic profiling of blood spots from donor's original sample.

    Science.gov (United States)

    Cardoso, Sergio; Valverde, Laura; Odriozola, Adrian; Elcoroaristizabal, Xabier; de Pancorbo, Marian M

    2010-07-01

    The field of Biobanking requires extensive work to maintain traceability of samples. However, sometimes the necessity to authenticate a sample may arise. To address these circumstances, we herein present a method for authenticating derivatives by using a blood spot from each donor, attached to a sample authentication form, by means of genetic profiling. Blood spots are collected at the time a blood sample is donated at a health centre and before processing the blood sample at the biobank. To test the validity of our approach over time, we analyzed 26 blood spots stored at room temperature in our facilities for more than 15 years. DNA was successfully extracted from the three storage materials tested in this study and 15 STR markers plus amelogenin were subsequently analyzed. The storage of a small blood spot attached to a sample authentication form proved to be efficient for genetic profiling and, therefore, may constitute a long-lasting (at least 15 years), cost-effective and effortless approach for genetic authentication of samples in biobanks.

  17. Make me authentic, but not here: Reflexive struggles with academic identity and authentic leadership

    OpenAIRE

    Tomkins, Leah; Nicholds, Alyson

    2017-01-01

    This article presents a reflexive auto-ethnography of the experience of teaching authentic leadership to MBA students. It traces parallels between the challenges of authentic leadership and the challenges of academic identity work, grounded specifically in the experience of having to teach something one does not fully endorse. Both authentic leadership and academic identity work emerge as struggle – riddled with false starts, best intentions and self-deception, and entwined in the politics of...

  18. Ancient RNA? RT-PCR of 50-year-old RNA identifies peach latent mosaic viroid.

    Science.gov (United States)

    Guy, Paul L

    2013-03-01

    The preservation of macromolecules is at best haphazard. Modern techniques have improved the detection of ancient DNA and proteins, but there is little information on the preservation of RNA. Fifty-year-old dried leaf material showing symptoms of peach calico disease was used successfully in RT-PCRs to amplify peach latent mosaic viroid (PLMVd) RNA and the mRNA for the large subunit of ribulose 1,5-bisphosphate carboxylase (rubisco). These results indicate that naked RNA may be preserved, under suitable conditions, for at least 50 years. The results are discussed in the context of ancient DNA and proteins and the process of fossilization.

  19. A User Authentication Based on Personal History- A User Authentication System Using E-mail History -

    Directory of Open Access Journals (Sweden)

    Masakatsu Nishigaki

    2007-04-01

    Full Text Available This paper proposes a user authentication using personal history of each user. Here, authentication is done by giving answers to questions about the history of user's daily life. Users do not have to memorize any password, since the passwords are what users already know by experience. In addition, everyday-life experience increases day by day, and thus the question could change on every authentication trial. In this paper, a user authentication system using user's e-mail history is shown as a prototype of our proposal, and some basic experiments to evaluate the availability of the system are carried out.

  20. Athos: Efficient Authentication of Outsourced File Systems

    DEFF Research Database (Denmark)

    Triandopoulos, Nikolaos; Goodrich, Michael T.; Papamanthou, Charalampos

    2008-01-01

    We study the problem of authenticated storage, where we wish to construct protocols that allow to outsource any complex file system to an untrusted server and yet ensure the file-system's integrity. We introduce Athos, a new, platform-independent and user-transparent architecture for authenticated...... outsourced storage. Using light-weight cryptographic primitives and efficient data-structuring techniques, we design authentication schemes that allow a client to efficiently verify that the file system is fully consistent with the exact history of updates and queries requested by the client. In Athos, file-system...... operations are verified in time that is logarithmic in the size of the file system using optimal storage complexity-constant storage overhead at the client and asymptotically no extra overhead at the server. We provide a prototype implementation of Athos validating its performance and its authentication...

  1. Authentic professional competence in clinical neuropsychology.

    Science.gov (United States)

    Denney, Robert L

    2010-08-01

    Authentic Professional Competence in Clinical Neuropsychology was Dr Denney's 2009 presidential address at the Annual Conference of the National Academy of Neuropsychology. In his address, he highlighted the need for clinical neuropsychologists to strive for authentic professional competence rather than a mere pretense of expertise. Undisputed credibility arises from authentic professional competence. Achieving authentic professional competence includes the completion of a thorough course of training within the defined specialty area and validation of expertise by one's peers through the board certification process. Included in the address were survey results regarding what the consumer believes about board certification as well as survey results regarding the experiences of recent neuropsychology diplomates. It is important for neuropsychologists to realize that the board certification process enhances public perception and credibility of the field as well as personal growth for the neuropsychologist. Lastly, he urged all neuropsychologists to support the unified training model and pursue board certification.

  2. IPCT: A scheme for mobile authentication

    Directory of Open Access Journals (Sweden)

    Vishnu Shankar

    2016-09-01

    Full Text Available Mobile is becoming a part of everyone's life and as their power of computation and storage is rising and cost is coming down. Most of mobile phone users have a lot of private data which they want to protect from others (La Polla et al., 2013. It means user must be authenticated properly for accessing the mobile resources. Normally user is authenticated using text passwords, PIN, face recognition or patterns etc. All these methods are used but they have some shortcomings. In this paper we have seen various existing methods of mobile authentications and proposed our improved mobile authentication IPCT scheme. We have compared our Image Pass Code with tapping scheme with existing techniques and shown that our scheme is better than existing techniques.

  3. Multi-factor authentication using quantum communication

    Science.gov (United States)

    Hughes, Richard John; Peterson, Charles Glen; Thrasher, James T.; Nordholt, Jane E.; Yard, Jon T.; Newell, Raymond Thorson; Somma, Rolando D.

    2018-02-06

    Multi-factor authentication using quantum communication ("QC") includes stages for enrollment and identification. For example, a user enrolls for multi-factor authentication that uses QC with a trusted authority. The trusted authority transmits device factor information associated with a user device (such as a hash function) and user factor information associated with the user (such as an encrypted version of a user password). The user device receives and stores the device factor information and user factor information. For multi-factor authentication that uses QC, the user device retrieves its stored device factor information and user factor information, then transmits the user factor information to the trusted authority, which also retrieves its stored device factor information. The user device and trusted authority use the device factor information and user factor information (more specifically, information such as a user password that is the basis of the user factor information) in multi-factor authentication that uses QC.

  4. ESnet authentication services and trust federations

    International Nuclear Information System (INIS)

    Muruganantham, Dhivakaran; Helm, Mike; Genovese, Tony

    2005-01-01

    ESnet provides authentication services and trust federation support for SciDAC projects, collaboratories, and other distributed computing applications. The ESnet ATF team operates the DOEGrids Certificate Authority, available to all DOE Office of Science programs, plus several custom CAs, including one for the National Fusion Collaboratory and one for NERSC. The secure hardware and software environment developed to support CAs is suitable for supporting additional custom authentication and authorization applications that your program might require. Seamless, secure interoperation across organizational and international boundaries is vital to collaborative science. We are fostering the development of international PKI federations by founding the TAGPMA, the American regional PMA, and the worldwide IGTF Policy Management Authority (PMA), as well as participating in European and Asian regional PMAs. We are investigating and prototyping distributed authentication technology that will allow us to support the 'roaming scientist' (distributed wireless via eduroam), as well as more secure authentication methods (one-time password tokens)

  5. Security Enhancement Using Mutual Authentication in Existing CDMA Systems

    OpenAIRE

    L. Krishna Bharathi; Gnanou Florence Sudha

    2010-01-01

    Even though CDMA2000 wireless networks are being widely deployed as a cellular digital standard around the world, it has some hidden vulnerabilities concerned with security issues. The existing CDMA systems use authentication mechanism by CAVE (Cellular Authentication and Voice Encryption) algorithm. This authentication method has several disadvantages. Only one way authentication is provided, that is, only a base station authenticates a subscriber. And, CAVE algorithm is prone to cryptograph...

  6. Authentic Material and Automaticity for Teaching English

    OpenAIRE

    Widyastuti, Widyastuti

    2017-01-01

    This article discusses how to make students of Science Education in first year feel interesting in English lesson, understanding the text well and can communicate English fluency. It has been suggested that Authentic Material and Automaticity Theory not only creates a friendly and fun condition in teaching reading but helps students to study comprehensibly so they are able to understand the text, structure, vocabulary easily, read fluently and they also can communicate in English. The authent...

  7. Authentic Leadership: Practices to Promote Integrity.

    Science.gov (United States)

    Hughes, Vickie

    Integrity is a highly desired leadership trait. Authentic leaders reflect on their behavior and seek feedback about how their actions affect others. How can a nurse develop as an authentic leader who consistently demonstrates integrity? The following are discussed: Reflection; Connection to Christ and others; Social and Emotional Intelligence providing perceptive competency and social awareness; Aesthetic Qualities whereby leaders apply experiential knowing in leadership situations; and effective expression of Gratitude as a meaningful act of valuing others.

  8. Study on Anti-seismic Strengthening of the Ancient Stone Archway

    Directory of Open Access Journals (Sweden)

    Zhang Ding

    2016-01-01

    Full Text Available Chinese ancient stone archways are in flat structure. And joints of their members are of half tenons and mortises. Under the influence of the earthquake, the resisting ability of archway’s uneven sides is relatively poor and the relevant members have little reliable joints. This paper is to analyze seismic strengthening feasibility of Tiantai mountain stone archway which is damaged from the earthquake and to research on the aspects of the loading mode, structure layout and soundness. On the premise of guaranteeing the authenticity and beauty, we use earthquake damaging mechanism of stone archways and the modern anti-seismic structure designing theory and modern building materials. We also follow the way of the modern construction technology and ancient construction and strengthen the anti-seismic way of the resisting ability of Tiantai mountain stone archway’s uneven sides and joints of tenons and mortises. The best anti-seismic strengthening schemes are put forward as well.

  9. Dreams in ancient Greek Medicine.

    Science.gov (United States)

    Laios, K; Moschos, M M; Koukaki, E; Vasilopoulos, E; Karamanou, M; Kontaxaki, M-I; Androutsos, G

    2016-01-01

    Dreams preoccupied the Greek and Roman world in antiquity, therefore they had a prominent role in social, philosophical, religious, historical and political life of those times. They were considered as omens and prophetic signs of future events in private and public life, and that was particularly accentuated when elements of actions which took place in the plot of dreams were associated directly or indirectly with real events. This is why it was important to use them in divination, and helped the growth of superstition and folklore believes. Medicine as a science and an anthropocentric art, could not ignore the importance of dreams, having in mind their popularity in antiquity. In ancient Greek medicine dreams can be divided into two basic categories. In the first one -which is related to religious medicine-dreams experienced by religionists are classified, when resorted to great religious sanctuaries such as those of Asclepius (Asclepieia) and Amphiaraos (Amfiaraeia). These dreams were the essential element for healing in this form of religious medicine, because after pilgrims underwent purifications they went to sleep in a special dwelling of the sanctuaries called "enkoimeterion" (Greek: the place to sleep) so that the healing god would come to their dreams either to cure them or to suggest treatment. In ancient Greek literature there are many reports of these experiences, but if there may be phenomena of self-suggestion, or they could be characterized as propaganda messages from the priesthood of each sanctuary for advertising purposes. The other category concerns the references about dreams found in ancient Greek medical literature, where one can find the attempts of ancient Greek physicians to interpret these dreams in a rational way as sings either of a corporal disease or of psychological distress. This second category will be the object of our study. Despite the different ways followed by each ancient Greek physician in order to explain dreams, their

  10. Authenticated join processing in outsourced databases

    KAUST Repository

    Yang, Yin

    2009-01-01

    Database outsourcing requires that a query server constructs a proof of result correctness, which can be verified by the client using the data owner\\'s signature. Previous authentication techniques deal with range queries on a single relation using an authenticated data structure (ADS). On the other hand, authenticated join processing is inherently more complex than ranges since only the base relations (but not their combination) are signed by the owner. In this paper, we present three novel join algorithms depending on the ADS availability: (i) Authenticated Indexed Sort Merge Join (AISM), which utilizes a single ADS on the join attribute, (ii) Authenticated Index Merge Join (AIM) that requires an ADS (on the join attribute) for both relations, and (iii) Authenticated Sort Merge Join (ASM), which does not rely on any ADS. We experimentally demonstrate that the proposed methods outperform two benchmark algorithms, often by several orders of magnitude, on all performance metrics, and effectively shift the workload to the outsourcing service. Finally, we extend our techniques to complex queries that combine multi-way joins with selections and projections. ©2009 ACM.

  11. Authenticity and Restoration: The Benefits of Historical Studies on Re-Examining the Implemented Restorations in Persepolis

    Directory of Open Access Journals (Sweden)

    Mahdi Motamedmanesh

    2016-03-01

    Full Text Available Preserving the authenticity of historical monuments is an inseparable part of restoration activities that has always been asserted by the international principles of historical preservation. However, the local condition of historical sites may influence such a primitive intention of restorers. While historical documents are appropriate sources which can provide restorers with the real condition of ancient structures in the course of time, investigation through these precious materials is a time-consuming process and the reliability of these old evidences is, itself, a challenging issue. The Italian Institute for Middle and Far East (IsMEO missioned long-term restoration activities in Persepolis between 1964 and the Islamic Revolution in Iran. Generally, this institute is praised for this series of projects. In this paper, the author questions the historical authenticity of restoration activities missioned by this institute in a structure so-called The Gate of All Nations. Indeed, the restoration of this structure was influenced by the 2500th anniversary of the Persian Empire, which was held in Persepolis in 1971. By tracing the context of historical evidences and presenting a method for obtaining the authenticity of these documents, this paper demonstrates a new perspective towards the arrangement of a stone-made capital, which ornaments the uppermost part of a re-erected ancient column.

  12. Insights into Modern Human Prehistory Using Ancient Genomes.

    Science.gov (United States)

    Yang, Melinda A; Fu, Qiaomei

    2018-03-01

    The genetic relationship of past modern humans to today's populations and each other was largely unknown until recently, when advances in ancient DNA sequencing allowed for unprecedented analysis of the genomes of these early people. These ancient genomes reveal new insights into human prehistory not always observed studying present-day populations, including greater details on the genetic diversity, population structure, and gene flow that characterized past human populations, particularly in early Eurasia, as well as increased insight on the relationship between archaic and modern humans. Here, we review genetic studies on ∼45000- to 7500-year-old individuals associated with mainly preagricultural cultures found in Eurasia, the Americas, and Africa. Copyright © 2017 Elsevier Ltd. All rights reserved.

  13. Ancient biomolecules: their origins, fossilization, and role in revealing the history of life.

    Science.gov (United States)

    Briggs, Derek E G; Summons, Roger E

    2014-05-01

    The discovery of traces of a blood meal in the abdomen of a 50-million-year-old mosquito reminds us of the insights that the chemistry of fossils can provide. Ancient DNA is the best known fossil molecule. It is less well known that new fossil targets and a growing database of ancient gene sequences are paralleled by discoveries on other classes of organic molecules. New analytical tools, such as the synchrotron, reveal traces of the original composition of arthropod cuticles that are more than 400 my old. Pigments such as melanin are readily fossilized, surviving virtually unaltered for ∼200 my. Other biomarkers provide evidence of microbial processes in ancient sediments, and have been used to reveal the presence of demosponges, for example, more than 635 mya, long before their spicules appear in the fossil record. Ancient biomolecules are a powerful complement to fossil remains in revealing the history of life. © 2014 WILEY Periodicals, Inc.

  14. Monitoring Biodiversity using Environmental DNA

    DEFF Research Database (Denmark)

    Thomsen, Philip Francis

    of mammalian DNA in leech guts is shown to persist for at least 4 months post feeding. Subsequently, it is shown that DNA from wild leeches, collected in tropical rainforest in Vietnam, contains DNA from wild mammals living in the area, representing poorly known, cryptic and threatened species. Finally......, a study tests the applicability of non-destructive DNA extraction from old and ancient insect remains. DNA is successfully retrieved, amplified and equenced from dried museum beetle specimens up to 188 years old, ermafrost-preserved macrofossils up to 26.000 years old and directly from 1800-3000 years old...

  15. Colour Perception in Ancient World

    Science.gov (United States)

    Nesterov, D. I.; Fedorova, M. Yu

    2017-11-01

    How did the human thought form the surrounding color information into the persistent semantic images of a mythological, pseudoscientific and religious nature? The concepts associated with colour perception are suggested. The existence of colour environment does not depend on the human consciousness. The colour culture formation is directly related to the level of the human consciousness development and the possibility to influence the worldview and culture. The colour perception of a person goes through the stages similar to the development of colour vision in a child. Like any development, the colour consciousness has undergone stages of growth and decline, evolution and stagnation. The way of life and difficult conditions for existence made their own adjustments to the development of the human perception of the surrounding world. Wars have been both a powerful engine of progress in all spheres of life and a great destructive force demolishing the already created and preserved heritage. The surrounding world has always been interesting for humans, evoked images and fantasies in the consciousness of ancient people. Unusual and inexplicable natural phenomena spawned numerous legends and myths which was reflected in the ancient art and architecture and, accordingly, in a certain manifestation of colour in the human society. The colour perception of the ancient man, his pragmatic, utilitarian attitude to colour is considered as well as the influence of dependence on external conditions of existence and their reflection in the colour culture of antiquity. “Natural Science” conducts research in the field of the colour nature and their authorial interpretation of the Hellenic period. Several authorial concepts of the ancient world have been considered.

  16. Identification of Meconopsis species by a DNA barcode sequence ...

    African Journals Online (AJOL)

    Deoxyribonucleic acid (DNA) barcoding is a novel technology that uses a standard DNA sequence to facilitate species identification. Species identification is necessary for the authentication of traditional plant based medicines. Although a consensus has not been agreed regarding which DNA sequences can be used as ...

  17. Perceptions of Leadership Coaches Regarding Leader Authenticity and Authenticity Development Strategies

    Science.gov (United States)

    Stone, Anne H.

    2012-01-01

    Purpose: The purpose of this study was to identify what leadership coaches perceive to be the benefits of authenticity to their clients' success. Another purpose was to identify what barriers leadership coaches perceive as preventing their clients from developing authenticity. A final purpose of this study was to identify which strategies…

  18. Authenticity is in the Eye of the Beholder: Student and Teacher Perceptions of Assessment Authenticity

    NARCIS (Netherlands)

    Gulikers, J.T.M.; Bastiaens, Th.J.; Kirschner, P.A.; Kester, L.

    2008-01-01

    In vocational education and training (VET) in the Netherlands, learning and working are integrated from the start. Authentic assessments are used during competence-based VET curricula to achieve correspondence between learning and working. The premise behind this study is that authenticity is

  19. Robust image authentication in the presence of noise

    CERN Document Server

    2015-01-01

    This book addresses the problems that hinder image authentication in the presence of noise. It considers the advantages and disadvantages of existing algorithms for image authentication and shows new approaches and solutions for robust image authentication. The state of the art algorithms are compared and, furthermore, innovative approaches and algorithms are introduced. The introduced algorithms are applied to improve image authentication, watermarking and biometry.    Aside from presenting new directions and algorithms for robust image authentication in the presence of noise, as well as image correction, this book also:   Provides an overview of the state of the art algorithms for image authentication in the presence of noise and modifications, as well as a comparison of these algorithms, Presents novel algorithms for robust image authentication, whereby the image is tried to be corrected and authenticated, Examines different views for the solution of problems connected to image authentication in the pre...

  20. Privacy-Preserving Biometric Authentication: Challenges and Directions

    Directory of Open Access Journals (Sweden)

    Elena Pagnin

    2017-01-01

    Full Text Available An emerging direction for authenticating people is the adoption of biometric authentication systems. Biometric credentials are becoming increasingly popular as a means of authenticating people due to the wide range of advantages that they provide with respect to classical authentication methods (e.g., password-based authentication. The most characteristic feature of this authentication method is the naturally strong bond between a user and her biometric credentials. This very same advantageous property, however, raises serious security and privacy concerns in case the biometric trait gets compromised. In this article, we present the most challenging issues that need to be taken into consideration when designing secure and privacy-preserving biometric authentication protocols. More precisely, we describe the main threats against privacy-preserving biometric authentication systems and give directions on possible countermeasures in order to design secure and privacy-preserving biometric authentication protocols.

  1. An investigation into the ancient abortion laws: comparing ancient Persia with ancient Greece and Rome.

    Science.gov (United States)

    Yarmohammadi, Hassan; Zargaran, Arman; Vatanpour, Azadeh; Abedini, Ehsan; Adhami, Siamak

    2013-01-01

    Since the dawn of medicine, medical rights and ethics have always been one of mankind's concerns. In any civilisation, attention paid to medical laws and ethics depends on the progress of human values and the advancement of medical science. The history of various civilisations teaches that each had its own views on medical ethics, but most had something in common. Ancient civilisations such as Greece, Rome, or Assyria did not consider the foetus to be alive and therefore to have human rights. In contrast, ancient Persians valued the foetus as a living person equal to others. Accordingly, they brought laws against abortion, even in cases of sexual abuse. Furthermore, abortion was considered to be a murder and punishments were meted out to the mother, father, and the person performing it.

  2. DNA fingerprinting for the authentication of Ruta graveolens

    African Journals Online (AJOL)

    Jane

    2011-08-15

    Aug 15, 2011 ... The roots and aerial parts of this plant contain more than 120 compounds of different classes of natural products such as acridone alkaloids, coumarines, essential oils, flavonoids and furoquinolines (Kostova et al., 1999;. Kuzovkinaa et al., 2004) and is the main source of furanocoumarins such as psoralen, ...

  3. Bioinformatical approaches to RNA structure prediction & Sequencing of an ancient human genome

    DEFF Research Database (Denmark)

    Lindgreen, Stinus

    tools that exist. The second part has been focused on the mapping and genotyping of ancient genomic DNA. The development of next generation sequencing technologies combined with the use of ancient DNA material present the researchers with some special challenges in the analyses. This work resulted...... in the publication of the first genome of an ancient human individual, where close to the theoretical maximum of the genome sequence was recovered with high confidence. Part of the project was the development of the program SNPest for genotyping and SNP calling that models various sources of error and predicts...... in families of related RNA sequences. Also, the program MASTR was developed to perform simultaneous alignment of multiple RNA sequences and prediction of a common secondary structure. The webserver WAR was developed to make it easy for non-computer savy researchers to use the many RNA structure prediction...

  4. Multiple maternal origins of native modern and ancient horse populations in China.

    Science.gov (United States)

    Lei, C Z; Su, R; Bower, M A; Edwards, C J; Wang, X B; Weining, S; Liu, L; Xie, W M; Li, F; Liu, R Y; Zhang, Y S; Zhang, C M; Chen, H

    2009-12-01

    To obtain more knowledge of the origin and genetic diversity of domestic horses in China, this study provides a comprehensive analysis of mitochondrial DNA (mtDNA) D-loop sequence diversity from nine horse breeds in China in conjunction with ancient DNA data and evidence from archaeological and historical records. A 247-bp mitochondrial D-loop sequence from 182 modern samples revealed a total of 70 haplotypes with a high level of genetic diversity. Seven major mtDNA haplogroups (A-G) and 16 clusters were identified for the 182 Chinese modern horses. In the present study, nine 247-bp mitochondrial D-loop sequences of ancient remains of Bronze Age horse from the Chifeng region of Inner Mongolia in China (c. 4000-2000a bp) were used to explore the origin and diversity of Chinese modern horses and the phylogenetic relationship between ancient and modern horses. The nine ancient horses carried seven haplotypes with rich genetic diversity, which were clustered together with modern individuals among haplogroups A, E and F. Modern domestic horse and ancient horse data support the multiple origins of domestic horses in China. This study supports the argument that multiple successful events of horse domestication, including separate introductions of wild mares into the domestic herds, may have occurred in antiquity, and that China cannot be excluded from these events. Indeed, the association of Far Eastern mtDNA types to haplogroup F was highly significant using Fisher's exact test of independence (P = 0.00002), lending support for Chinese domestication of this haplogroup. High diversity and all seven mtDNA haplogroups (A-G) with 16 clusters also suggest that further work is necessary to shed more light on horse domestication in China.

  5. ENHANCING STUDENTS’ VOCABULARY MASTERY THROUGH AUTHENTIC MATERIALS

    Directory of Open Access Journals (Sweden)

    Nuraeningsih Nuraeningsih

    2017-04-01

    Full Text Available Teaching vocabulary using textbooks is sometimes boring and less meaningful due to the lack of context that possibly discourages students to learn. At university level, students are supposed to acquire intermediate to upper level of vocabulary mastery. The situation then becomes a challenge for us to cope. Authentic materials, on the other hand provide real language use which can be positively stimulate students’ interest to have sufficient exposure to English. This research is aimed at improving students’ vocabulary mastery through written authentic materials. The design of the research is classroom action research. It was conducted in a Vocabulary Building class B consisting of 43 students. The selected authentic materials are texts taken from newspaper, magazine, the internet, recipe, & forms. The result of the study shows that through authentic materials the students’ vocabulary mastery in cycle I & II improves and the achievement category is sufficient. Otherwise, students’ response towards the use of authentic texts seems increase significantly from cycle I to cycle II.

  6. Disambiguating authenticity: Interpretations of value and appeal.

    Science.gov (United States)

    O'Connor, Kieran; Carroll, Glenn R; Kovács, Balázs

    2017-01-01

    While shaping aesthetic judgment and choice, socially constructed authenticity takes on some very different meanings among observers, consumers, producers and critics. Using a theoretical framework positing four distinct meanings of socially constructed authenticity-type, moral, craft, and idiosyncratic-we aim to document empirically the unique appeal of each type. We develop predictions about the relationships between attributed authenticity and corresponding increases in the value ascribed to it through: (1) consumer value ratings, (2) willingness to pay, and (3) behavioral choice. We report empirical analyses from a research program of three multi-method studies using (1) archival data from voluntary consumer evaluations of restaurants in an online review system, (2) a university-based behavioral lab experiment, and (3) an online survey-based experiment. Evidence is consistent across the studies and suggests that perceptions of four distinct subtypes of socially constructed authenticity generate increased appeal and value even after controlling for option quality. Findings suggest additional directions for research on authenticity.

  7. Disambiguating authenticity: Interpretations of value and appeal.

    Directory of Open Access Journals (Sweden)

    Kieran O'Connor

    Full Text Available While shaping aesthetic judgment and choice, socially constructed authenticity takes on some very different meanings among observers, consumers, producers and critics. Using a theoretical framework positing four distinct meanings of socially constructed authenticity-type, moral, craft, and idiosyncratic-we aim to document empirically the unique appeal of each type. We develop predictions about the relationships between attributed authenticity and corresponding increases in the value ascribed to it through: (1 consumer value ratings, (2 willingness to pay, and (3 behavioral choice. We report empirical analyses from a research program of three multi-method studies using (1 archival data from voluntary consumer evaluations of restaurants in an online review system, (2 a university-based behavioral lab experiment, and (3 an online survey-based experiment. Evidence is consistent across the studies and suggests that perceptions of four distinct subtypes of socially constructed authenticity generate increased appeal and value even after controlling for option quality. Findings suggest additional directions for research on authenticity.

  8. Aging and the Ethics of Authenticity.

    Science.gov (United States)

    Laceulle, Hanne

    2017-05-02

    This article aims to make a philosophical contribution to debates about meaningful sociocultural narratives about aging. It is argued that the moral-philosophical discourse of authenticity may provide valuable resources for counter narratives about later life that are capable of challenging the dominant stereotyping decline- and age-defying cultural narratives. The discussion will draw on classical and contemporary views of authenticity by Rousseau; existentialists such as Kierkegaard, Nietzsche, and Heidegger; and contemporary thinkers such as Taylor and Meyers. Authenticity discourse is argued to be capable of, on the one hand, acknowledging the positive potentials of growth and development that later life may harbor, while, on the other hand, providing support for recognizing and integrating the inevitable existential vulnerability and finitude that old age also confronts us with. Although authenticity is not a commonly used term in gerontology, some examples show how a language associated with this philosophical discourse has found its way into gerontological thought as well, supporting its relevance for the context of aging. The article concludes with a discussion of four aspects through which the authenticity discourse may contribute to viable cultural narratives about later life. © The Author 2017. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  9. AUTHENTIC TEXTS FOR CRITICAL READING ACTIVITIES

    Directory of Open Access Journals (Sweden)

    Ila Amalia

    2016-03-01

    Full Text Available This research takes an action research aimed at promoting critical reading (“thinking” while reading skills using authentic materials among the students. This research also aims to reveal the students perception on using critical reading skills in reading activities. Nineteen English Education Department students who took Reading IV class, participated in this project. There were three cycles with three different critical reading strategies were applied. Meanwhile, the authentic materials were taken from newspaper and internet articles. The result revealed that the use of critical reading strategies along with the use of authentic materials has improved students’ critical reading skills as seen from the improvement of each cycle - the students critical reading skill was 54% (fair in the cycle 1 improved to 68% (average in cycle 2, and 82% (good in cycle 3.. In addition, based on the critical reading skill criteria, the students’ critical reading skill has improved from 40% (nearly meet to 80% (exceed. Meanwhile, from the students’ perception questionnaire, it was shown that 63% students agreed the critical reading activity using authentic text could improve critical thinking and 58% students agreed that doing critical reading activity could improve reading comprehension. The result had the implication that the use of authentic texts could improve students’ critical reading skills if it was taught by performing not lecturing them. Selectively choosing various strategies and materials can trigger students’ activeness in responding to a text, that eventually shape their critical reading skills.

  10. Simulations in nursing practice: toward authentic leadership.

    Science.gov (United States)

    Shapira-Lishchinsky, Orly

    2014-01-01

    Aim  This study explores nurses' ethical decision-making in team simulations in order to identify the benefits of these simulations for authentic leadership. Background  While previous studies have indicated that team simulations may improve ethics in the workplace by reducing the number of errors, those studies focused mainly on clinical aspects and not on nurses' ethical experiences or on the benefits of authentic leadership. Methods  Fifty nurses from 10 health institutions in central Israel participated in the study. Data about nurses' ethical experiences were collected from 10 teams. Qualitative data analysis based on Grounded Theory was applied, using the atlas.ti 5.0 software package. Findings  Simulation findings suggest four main benefits that reflect the underlying components of authentic leadership: self-awareness, relational transparency, balanced information processing and internalized moral perspective. Conclusions  Team-based simulation as a training tool may lead to authentic leadership among nurses. Implications for nursing management  Nursing management should incorporate team simulations into nursing practice to help resolve power conflicts and to develop authentic leadership in nursing. Consequently, errors will decrease, patients' safety will increase and optimal treatment will be provided. © 2012 John Wiley & Sons Ltd.

  11. Password Authentication Based on Fractal Coding Scheme

    Directory of Open Access Journals (Sweden)

    Nadia M. G. Al-Saidi

    2012-01-01

    Full Text Available Password authentication is a mechanism used to authenticate user identity over insecure communication channel. In this paper, a new method to improve the security of password authentication is proposed. It is based on the compression capability of the fractal image coding to provide an authorized user a secure access to registration and login process. In the proposed scheme, a hashed password string is generated and encrypted to be captured together with the user identity using text to image mechanisms. The advantage of fractal image coding is to be used to securely send the compressed image data through a nonsecured communication channel to the server. The verification of client information with the database system is achieved in the server to authenticate the legal user. The encrypted hashed password in the decoded fractal image is recognized using optical character recognition. The authentication process is performed after a successful verification of the client identity by comparing the decrypted hashed password with those which was stored in the database system. The system is analyzed and discussed from the attacker’s viewpoint. A security comparison is performed to show that the proposed scheme provides an essential security requirement, while their efficiency makes it easier to be applied alone or in hybrid with other security methods. Computer simulation and statistical analysis are presented.

  12. Phylotyping and functional analysis of two ancient human microbiomes.

    Directory of Open Access Journals (Sweden)

    Raúl Y Tito

    Full Text Available BACKGROUND: The Human Microbiome Project (HMP is one of the U.S. National Institutes of Health Roadmap for Medical Research. Primary interests of the HMP include the distinctiveness of different gut microbiomes, the factors influencing microbiome diversity, and the functional redundancies of the members of human microbiotas. In this present work, we contribute to these interests by characterizing two extinct human microbiotas. METHODOLOGY/PRINCIPAL FINDINGS: We examine two paleofecal samples originating from cave deposits in Durango Mexico and dating to approximately 1300 years ago. Contamination control is a serious issue in ancient DNA research; we use a novel approach to control contamination. After we determined that each sample originated from a different human, we generated 45 thousand shotgun DNA sequencing reads. The phylotyping and functional analysis of these reads reveals a signature consistent with the modern gut ecology. Interestingly, inter-individual variability for phenotypes but not functional pathways was observed. The two ancient samples have more similar functional profiles to each other than to a recently published profile for modern humans. This similarity could not be explained by a chance sampling of the databases. CONCLUSIONS/SIGNIFICANCE: We conduct a phylotyping and functional analysis of ancient human microbiomes, while providing novel methods to control for DNA contamination and novel hypotheses about past microbiome biogeography. We postulate that natural selection has more of an influence on microbiome functional profiles than it does on the species represented in the microbial ecology. We propose that human microbiomes were more geographically structured during pre-Columbian times than today.

  13. Binary DNA nanostructures for data encryption.

    Science.gov (United States)

    Halvorsen, Ken; Wong, Wesley P

    2012-01-01

    We present a simple and secure system for encrypting and decrypting information using DNA self-assembly. Binary data is encoded in the geometry of DNA nanostructures with two distinct conformations. Removing or leaving out a single component reduces these structures to an encrypted solution of ssDNA, whereas adding back this missing "decryption key" causes the spontaneous formation of the message through self-assembly, enabling rapid read out via gel electrophoresis. Applications include authentication, secure messaging, and barcoding.

  14. Applying high-resolution melting (HRM) technology to olive oil and wine authenticity.

    Science.gov (United States)

    Pereira, Leonor; Gomes, Sónia; Barrias, Sara; Fernandes, José Ramiro; Martins-Lopes, Paula

    2018-01-01

    Olive oil and wine production have a worldwide economic impact. Their market reliability is under great concern because of the increasing number of fraud and adulteration attempts. The need for a traceability system in all its extension is crucial particularly for the cases of olive oils and wines with certified labels, in which only a limited number of olives and grapevine varieties, respectively, are allowed in a restricted well-defined geographical area. Molecular markers have been vastly applied to the food sector, and in particular High-Resolution DNA Melting technology has been successfully applied for olive oil and wine authentication, as part of the traceability system. In this review, the applications of HRM and their usefulness for this sector considering, Safety, Security and Authenticity will be reviewed. A broad overview of the HRM technique will be presented, focusing on the aspects that are crucial for its success, in particular the new generation of fluorescent dsDNA dyes used for amplicon detection and quantification, and the data analysis. A brief outlook on the olive oil and wine authenticity procedures, based on new DNA technology advances, and in which way this may influence the future establishment of a traceability system will be discussed. Copyright © 2017 Elsevier Ltd. All rights reserved.

  15. Response to Comment on "Whole-Genome Shotgun Sequencing of Mitochondria from Ancient Hair Shafts"

    DEFF Research Database (Denmark)

    Gilbert, Marcus Thomas Pius; Miller, Webb; Schuster, Stephan C.

    2008-01-01

    Debruyne et al. challenge the findings of our study and imply that we argue that hair shafts are an overall superior source of ancient DNA than bone. However, the authors are misreading and misinterpreting the conclusions of our study; we claim nothing further than that hair shaft represents an e...

  16. Evolutionary History of Saber-Toothed Cats Based on Ancient Mitogenomics

    NARCIS (Netherlands)

    Paijmans, Johanna L.A.; Barnett, Ross; Gilbert, M. Thomas P.; Zepeda-Mendoza, M. Lisandra; Reumer, Jelle W.F.; de Vos, John; Zazula, Grant; Nagel, Doris; Baryshnikov, Gennady F.; Leonard, Jennifer A.; Rohland, Nadin; Westbury, Michael V.; Barlow, Axel; Hofreiter, Michael

    2017-01-01

    Saber-toothed cats (Machairodontinae) are among the most widely recognized representatives of the now largely extinct Pleistocene megafauna. However, many aspects of their ecology, evolution, and extinction remain uncertain. Although ancient-DNA studies have led to huge advances in our knowledge of

  17. Response to Comment on "Whole-Genome Shotgun Sequencing of Mitochondria from Ancient Hair Shafts"

    DEFF Research Database (Denmark)

    Gilbert, Marcus Thomas Pius; Miller, Webb; Schuster, Stephan C.

    2008-01-01

    Debruyne et al. challenge the findings of our study and imply that we argue that hair shafts are an overall superior source of ancient DNA than bone. However, the authors are misreading and misinterpreting the conclusions of our study; we claim nothing further than that hair shaft represents...

  18. Population genetic analysis reveals ancient evolution and recent migration of P. ramorum

    Science.gov (United States)

    Erica M. Goss; Meg Larsen; Ignazio Carbone; Donald R. Givens; Gary A. Chastagner; Niklaus J. Gr& uuml; nwald

    2010-01-01

    Phytophthora ramorum populations in North America and Europe are comprised of three clonal lineages based on several different genetic marker systems (Ivors and others 2006, Martin 2008). Whether these lineages are ancient or a recent artifact of introduction has been unclear. We analyzed DNA sequence variation at five nuclear loci in order to...

  19. The conscious of Nightmares in ancient China

    OpenAIRE

    西林, 眞紀子

    2006-01-01

    The analaysis concerns Nightmares in ancient China. People in ancient China were very afraid of Nightmares. Nightmares are described in the『春秋左氏傳』etc. The exocis Nightmares is described in the『周禮』. The ceremony "難" of exocis Nightmares in the『禮記』. In the characters Meng (夢) had the conscious of Nightmares in ancient China. The analaysis is about the characters 'Meng', about the characters of the relationship 'Meng'

  20. The Ancient Greece's roots of Olimpism

    Directory of Open Access Journals (Sweden)

    Bubka Sergej Nazarovich

    2011-10-01

    Full Text Available The paper focused on the phenomena of sport in Ancient Greece along with history, traditions, religion, education, culture and art. Economic and political conditions are analysed which promote or hamper development of Olympic Games in Ancient Greece. Exceptional stability of Ancient Olympic games during more than eleven centuries are noted as well as their influence on the life of Greek polices of those days. Hellenistic period needs of individual consideration.