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Ancient genomes reveal insights into ritual life at Chichén Itzá.
Nature
June 2024
Department of Archaeogenetics, Max-Planck Institute for Evolutionary Anthropology (MPI-EVA), Leipzig, Germany.
The ancient city of Chichén Itzá in Yucatán, Mexico, was one of the largest and most influential Maya settlements during the Late and Terminal Classic periods (AD 600-1000) and it remains one of the most intensively studied archaeological sites in Mesoamerica. However, many questions about the social and cultural use of its ceremonial spaces, as well as its population's genetic ties to other Mesoamerican groups, remain unanswered. Here we present genome-wide data obtained from 64 subadult individuals dating to around AD 500-900 that were found in a subterranean mass burial near the Sacred Cenote (sinkhole) in the ceremonial centre of Chichén Itzá.
View Article and Find Full Text PDFImmobilization of Magnetic Nanoparticles on Cellulosic Wooden Sawdust for Competitive Nudrin Elimination from Environmental Waters as a Green Strategy: Box-Behnken Design Optimization.
Int J Environ Res Public Health
November 2022
Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia.
The role of engineering in our society is not to just to continue creating chemicals, but sharing the responsibility for environmentally sound appropriate design of substances for a circular economy. Concerning this contemporary strategy, waste wooden sawdust (WSD) as a biobased by-product is augmented with magnetite (Mag) nanoparticles to meet the concept of cyclic application of resources in environmentally relevant photocatalytic reactions. The physical properties of the prepared WSD:Mag material were characterized to emphasis their structure and morphology by using X-ray diffraction (XRD) and transmission electron microscopy (TEM), then the prepared catalyst was applied in augmentation with hydrogen peroxide as a type of photocatalyst in the form of Fenton's reaction system to oxidize Nudrin pesticide in queues media.
View Article and Find Full Text PDFNatural human chimeras: A review.
Eur J Med Genet
September 2020
Department of Clinical Genetics, Leiden University Medical Center, Post Box 9600, 2300 RC, Leiden, the Netherlands. Electronic address:
The term chimera has been borrowed from Greek mythology and has a long history of use in biology and genetics. A chimera is an organism whose cells are derived from two or more zygotes. Recipients of tissue and organ transplants are artificial chimeras.
View Article and Find Full Text PDFTwins in Ancient Greece: a synopsis.
J Matern Fetal Neonatal Med
January 2017
a Department of Neonatology , University of Athens, Athens , Greece.
This brief outline associates twins with several aspects of life in Ancient Greece. In Greek mythology twins caused ambivalent reactions and were believed to have ambivalent feelings for each other. Very often, they were viewed as the representatives of the dualistic nature of the universe.
View Article and Find Full Text PDF[The fictitious embryo: a critical history of a biological myth. The author explains his book].
Cuad Bioet
December 2016
Departamento de Educación Médica y Bioética, Universidad de Navarra.
Basically, the commented upon book is the result of the writer's reaction to the absence of serious biological science that for years is reigning in the bioethics of the human embryo. The embryology used by bioethicists, both in their theoretical studies and in their interventions before public policy drafting committees, has consisted essentially not in primary research materials, but in text-book descriptions, with which resulted easier to support the theory of the pre-embryo. In this way, biologists were able to provide philosophers and jurists with a number of apparently scientific ″arguments″ so convincing that no one felt the need to review them critically.
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