|
Trail Creek Caves
The Trail Creek Caves are a group of twelve caves found within the Bering Land Bridge National Preserve on the Seward Peninsula of the U.S. state of Alaska. This is a significant archeological site due to the discovery of several artifacts of ancient hunters. These included stone tools and bone fragments dated to 8,500 years or earlier. The caves were discovered in 1928 by Taylor Moto and Alfred Karmun, locals from Deering, Alaska. Geologist David Hopkins tested the site in 1948. This location was first excavated in from 1949-1950 by Danish archeologist . The caves are located along Trail Creek near its mouth at Cottonwood Creek in the Northwest Arctic Borough. In 2018, researchers sequenced the genome to around .4 coverage Coverage may refer to: Filmmaking * Coverage (lens), the size of the image a lens can produce * Camera coverage, the amount of footage shot and different camera setups used in filming a scene * Script coverage, a short summary of a script, wri . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genome
In the fields of molecular biology and genetics, a genome is all the genetic information of an organism. It consists of nucleotide sequences of DNA (or RNA in RNA viruses). The nuclear genome includes protein-coding genes and non-coding genes, other functional regions of the genome such as regulatory sequences (see non-coding DNA), and often a substantial fraction of 'junk' DNA with no evident function. Almost all eukaryotes have mitochondria and a small mitochondrial genome. Algae and plants also contain chloroplasts with a chloroplast genome. The study of the genome is called genomics. The genomes of many organisms have been sequenced and various regions have been annotated. The International Human Genome Project reported the sequence of the genome for ''Homo sapiens'' in 200The Human Genome Project although the initial "finished" sequence was missing 8% of the genome consisting mostly of repetitive sequences. With advancements in technology that could handle sequenci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caves Of Alaska
A cave or cavern is a natural void in the Earth#Surface, ground, specifically a space large enough for a human to enter. Caves often form by the weathering of rock and often extend deep underground. The word ''cave'' can refer to smaller openings such as sea caves, rock shelters, and grottos, that extend a relatively short distance into the rock and they are called ''exogene'' caves. Caves which extend further underground than the opening is wide are called ''endogene'' caves. Speleology is the science of exploration and study of all aspects of caves and the cave environment. Visiting or exploring caves for recreation may be called Caving, ''caving'', ''potholing'', or ''spelunking''. Formation types The formation and development of caves is known as ''speleogenesis''; it can occur over the course of millions of years. Caves can range widely in size, and are formed by various geological processes. These may involve a combination of chemical processes, erosion by water, tectonic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeological Sites In Alaska
Archaeology or archeology is the scientific study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, sites, and cultural landscapes. Archaeology can be considered both a social science and a branch of the humanities. It is usually considered an independent academic discipline, but may also be classified as part of anthropology (in North America – the four-field approach), history or geography. Archaeologists study human prehistory and history, from the development of the first stone tools at Lomekwi in East Africa 3.3 million years ago up until recent decades. Archaeology is distinct from palaeontology, which is the study of fossil remains. Archaeology is particularly important for learning about prehistoric societies, for which, by definition, there are no written records. Prehistory includes over 99% of the human past, from the Paleolithic until the adve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haplogroup B (mtDNA)
In human mitochondrial genetics, haplogroup B is a human mitochondrial DNA (mtDNA) haplogroup. Origin Haplogroup B is believed to have arisen in Asia some 50,000 years before present. Its ancestral haplogroup was haplogroup R. The greatest variety of haplogroup B is in China. It is therefore likely that it underwent its earliest diversification in mainland East or South East Asia.Yong-Gang Yao et al. 2001Phylogeographic Differentiation of Mitochondrial DNA in Han ChineseAm J Hum Genet. 2002 March; 70(3): 635–651 Distribution Basal B was found in Upper Paleolithic Tianyuan man. Haplogroup B is now most common among populations native to Southeast Asia, as well as speakers of Sino-Tibetan languages and Austronesian languages. A subclade of B4b (which is sometimes labeled B2) is one of five haplogroups found among the indigenous peoples of the Americas, the others being A, C, D, and X. Because the migration to the Americas by the ancestors of indigenous Americans is gener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Beringian
The Ancient Beringians (AB) is a specific archaeogenetic lineage, based on the genome of an infant found at the Upward Sun River site (dubbed USR1), dated to 11,500 years ago. The AB lineage diverged from the '' Ancestral Native American'' (ANA) lineage about 20,000 years ago. The ANA lineage was estimated as having been formed between 20,000 and 25,000 years ago by a mixture of East Asian and Ancient North Eurasian lineages, consistent with the model of the peopling of the Americas via Beringia during the Last Glacial Maximum. Research The Ancient Beringian lineage is extinct, and is not found as a contribution to modern indigenous lineages in Alaska. The 2018 study suggests that the AB lineage was replaced by or absorbed in a back-migration of NNA (see below) to Alaska. The modern Athabaskan populations are derived from an admixture of this NNA back-migration and a Paleo-Siberian (Early Paleo-Eskimo) lineage before about 2,500 years ago.Moreno-Mayar et al. (2018), fig. 3Suppl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upward Sun River Site
The Upward Sun River site, or Xaasaa Na’, is a Late Pleistocene archaeological site associated with the Paleo-Arctic tradition, located in the Tanana River Valley, Alaska. Dated to around 11,500 BP, Upward Sun River is the site of the oldest human remains discovered on the American side of Beringia. The site was first discovered in 2006. The layer with the human remains at Upward Sun River is most similar to the level 6 layer from Ushki Lake, Kamchatka. Both sites are the only Beringian burials found so far from that period. Etymology The name of the site, Upward Sun River, is a direct translation of the Middle Tanana name for the site, ''Xaasaa Na’''. The Middle Tanana name was recorded from the mother of a mother-daughter pair, two of the last remaining speakers of Middle Tanana, during an interview in the 1960s. Human remains The first excavation at Upward Sun River in 2010 yielded the cremated remains of a 3-year-old individual. The individual had been cremated insid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Before Present
Before Present (BP) years, or "years before present", is a time scale used mainly in archaeology, geology and other scientific disciplines to specify when events occurred relative to the origin of practical radiocarbon dating in the 1950s. Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date (epoch) of the age scale. The abbreviation "BP" has been interpreted retrospectively as "Before Physics", which refers to the time before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, which scientists must now account for. In a convention that is not always observed, many sources restrict the use of BP dates to those produced with radiocarbon dating; the alternative notation RCYBP stands for the explicit "radio carbon years before present". Usage The BP scale is sometimes used for dates established by means other than radiocarbon dating, such as stratigraphy. This usage differs from t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coverage (genetics)
Coverage (or depth) in DNA sequencing is the number of unique reads that include a given nucleotide in the reconstructed sequence. Deep sequencing refers to the general concept of aiming for high number of unique reads of each region of a sequence. Rationale Even though the sequencing accuracy for each individual nucleotide is very high, the very large number of nucleotides in the genome means that if an individual genome is only sequenced once, there will be a significant number of sequencing errors. Furthermore, many positions in a genome contain rare single-nucleotide polymorphisms (SNPs). Hence to distinguish between sequencing errors and true SNPs, it is necessary to increase the sequencing accuracy even further by sequencing individual genomes a large number of times. Ultra-deep sequencing The term "ultra-deep" can sometimes also refer to higher coverage (>100-fold), which allows for detection of sequence variants in mixed populations. In the extreme, error-corrected sequ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northwest Arctic Borough, Alaska
Northwest Arctic Borough is a borough located in the U.S. state of Alaska. As of the 2020 census, the population was 7,793, up from 7,523 in 2010. The borough seat is Kotzebue. The borough was formed on June 2, 1986. Geography According to the U.S. Census Bureau, the borough has a total area of , of which is land and (12.7%) is water. By land area, it is slightly larger in total area than the state of Indiana. Its coastline is limited by the Chukchi Sea. The Kotzebue Sound, a significant wildlife area, is a prominent water body within the Northwest Arctic Borough. The largest polar bear sighted in history, a male weighing , was sighted at Kotzebue Sound.C. Michael Hogan (2008''Polar Bear: Ursus maritimus'', Globaltwitcher.com, ed. N. Stromberg Adjacent boroughs and census areas * North Slope Borough, Alaska - north * Yukon-Koyukuk Census Area, Alaska - east * Nome Census Area, Alaska - south National protected areas * Alaska Maritime National Wildlife Refuge (part of the C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Chicago
The University of Chicago (UChicago, Chicago, U of C, or UChi) is a private research university in Chicago, Illinois. Its main campus is located in Chicago's Hyde Park neighborhood. The University of Chicago is consistently ranked among the best universities in the world and it is among the most selective in the United States. The university is composed of an undergraduate college and five graduate research divisions, which contain all of the university's graduate programs and interdisciplinary committees. Chicago has eight professional schools: the Law School, the Booth School of Business, the Pritzker School of Medicine, the Crown Family School of Social Work, Policy, and Practice, the Harris School of Public Policy, the Divinity School, the Graham School of Continuing Liberal and Professional Studies, and the Pritzker School of Molecular Engineering. The university has additional campuses and centers in London, Paris, Beijing, Delhi, and Hong Kong, as well as in downtown ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Archaeological Sites In Alaska")
