نتایج جستجو برای: ancient
تعداد نتایج: 38123 فیلتر نتایج به سال:
Studies of DNA from ancient samples provide a valuable opportunity to gain insight into past evolutionary and demographic processes. Bayesian phylogenetic methods can estimate evolutionary rates and timescales from ancient DNA sequences, with the ages of the samples acting as calibrations for the molecular clock. Sample ages are often estimated using radiocarbon dating, but the associated measu...
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 theor...
Working together in groups may be beneficial if compared to isolated efforts. Yet this is true only if all group members contribute to the success. If not, group efforts may act detrimentally on the fitness of their members. Here we study the evolution of cooperation in public-goods games on scale-free networks that are subject to deletion of links connected to the highest-degree individuals, i...
Between 1500 and 1850, more than 12 million enslaved Africans were transported to the New World. The vast majority were shipped from West and West-Central Africa, but their precise origins are largely unknown. We used genome-wide ancient DNA analyses to investigate the genetic origins of three enslaved Africans whose remains were recovered on the Caribbean island of Saint Martin. We trace their...
The applications ORPHEUS and ARION have been presented to vast audiences during the International Fair of Thessaloniki between 8-17 September 2006. They were presented in international conferences, in nation-wide radio emissions, in newspaper and magazine articles. ORPHEUS has been supported by the “HERMES”1 project, while ARION is under the auspices of the SEEArchWeb2 project. ORPHEUS is an in...
Ancestral genome reconstruction is an important step in analyzing the evolution of genomes. Recent progress in sequencing ancient DNA led to the publication of so-called paleogenomes and allows the integration of this sequencing data in genome evolution analysis. However, the assembly of ancient genomes is fragmented because of DNA degradation over time. Integrated phylogenetic assembly address...
Achievements and Peculiarities in Studies of Ancient DNA and DNA from Complicated Forensic Specimens
Studies of ancient DNA specimens started 25 years ago. At that time short mitochondrial DNA (mtDNA) fragments were the main targets in ancient DNA studies. The last three years were especially productive in the development of new methods of DNA purification and analysis. Complete mtDNA molecules and relatively large fragments of nuclear DNA are the targets of ancient DNA studies today. Ancient ...
studying the history of science in ancient civilizations can help to shed light on the mysteries of the history of science as well as the contribution of nations to the growth of science in the world throughout the history. among various branches of science, medicine is of particular importance and owing to the crucial role of physicians in this discipline; the present study has taken the role ...
in middle persian (pahlavi), like many other languages, one aspect of subjunctive verbs in the present tense and the past tense is used, but the evidence in the literature that is available only from some syghhhay. middle persian is bound by the obligation kmkarbrdtr of past and present verb root is apparently limited to some of the material or ben hung verbs and auxiliary verb hād made. howeve...
in middle persian (pahlavi), like many other languages, one aspect of subjunctive verbs in the present tense and the past tense is used, but the evidence in the literature that is available only from some syghhhay. middle persian is bound by the obligation kmkarbrdtr of past and present verb root is apparently limited to some of the material or ben hung verbs and auxiliary verb hād made. howeve...
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