2001
DOI: 10.1073/pnas.98.3.796
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Searching for an alien haven in the heavens

Abstract: Searching for an alien haven in the heavens T he first few articles in this issue of PNAS constitute the beginning of a two-part Special Feature dedicated to the study of astrobiology. Astrobiology is not an autonomous or self-sustaining discipline. Rather, it is a hybrid subject emerging at the crossroads of astronomy, geology, paleontology, physics, and biology. What at first pass may seem like an amalgamation of disparate fields, upon further review, is a clear and increasingly defined discipline. The roots… Show more

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Cited by 2 publications
(3 citation statements)
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“…Significant negative departures of these tests are caused by an excess of new mutations resulting from evolutionary forces such as selective sweeps or population expansion. Processes that maintain an excess of old mutations result in positive departures [55] . The mtDNA sequence data have been submitted to Genbank under accession nos EU559605-EU559621 (COII) and EU562262-EU562281 (CytB).…”
Section: Methodsmentioning
confidence: 99%
“…Significant negative departures of these tests are caused by an excess of new mutations resulting from evolutionary forces such as selective sweeps or population expansion. Processes that maintain an excess of old mutations result in positive departures [55] . The mtDNA sequence data have been submitted to Genbank under accession nos EU559605-EU559621 (COII) and EU562262-EU562281 (CytB).…”
Section: Methodsmentioning
confidence: 99%
“…In about 60,000 years, modern humans left Africa and colonized all other continents, with the exception of Antarctica [35] , [36] . Since then, human populations have lived in an extraordinary variety of habitats.…”
Section: Discussionmentioning
confidence: 99%
“…However, since it is well-known that these parameters are also affected by the demographic histories of the population considered [29] , we incorporated in the analysis coalescence simulations using Rogers' algorithm [46] as implemented by [47] in the DFSC 1.1 software ( www.xmission.com/~wooding/DFSC/ ). Distinct scenarios on times of expansion and initial population sizes compatible with the available data were simulated as follows: 1) For all samples, initial populations of 1,000 or 10,000 individuals [48] , [49] starting 60,000 years ago [35] , [36] , [49] ; 2) For all non-African populations, initial population of 10,000, date 40,000 years ago; 3) For Japanese only, 3,000 starting individuals, date 37,000 years ago [50] ; 4) For the Native American and Eskimo dataset, initial populations of 80 or 500 individuals [51] , [52] , starting 18,000 years ago [51] , [53] . For all scenarios described above we considered assumptions of population growth ranging from 1-fold (stationary) to 100-fold.…”
Section: Methodsmentioning
confidence: 99%