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Sasaki, Takuji

doi:10.1023/a:1013844110497

Cited by 11 publications

(9 citation statements)

References 28 publications

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“…Whereas O. glaberrima is cultivated in restricted areas of western Africa, O. sativa is cultivated globally. Since the time of its initial domestication, Asian cultivated rice has been moved across the globe with migrating human populations (13); rice cultivation can now be found on all continents except Antarctica and feeds more than half of the world's population (12). Each year an estimated 408,661 million metric tons of rice is consumed, supplying 20% of the world's total caloric intake (14).…”

Section: Study Systemmentioning

confidence: 99%

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Phylogeography of Asian wild rice, Oryza rufipogon , reveals multiple independent domestications of cultivated rice, Oryza sativa

Londo

Chiang

Hung

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

609

466

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Cultivated rice, Oryza sativa L., represents the world's most important staple food crop, feeding more than half of the human population. Despite this essential role in world agriculture, the history of cultivated rice's domestication from its wild ancestor, Oryza rufipogon, remains unclear. In this study, DNA sequence variation in three gene regions is examined in a phylogeographic approach to investigate the domestication of cultivated rice. Results indicate that India and Indochina may represent the ancestral center of diversity for O. rufipogon. Additionally, the data suggest that cultivated rice was domesticated at least twice from different O. rufipogon populations and that the products of these two independent domestication events are the two major rice varieties, Oryza sativa indica and Oryza sativa japonica. Based on this geographical analysis, O. sativa indica was domesticated within a region south of the Himalaya mountain range, likely eastern India, Myanmar, and Thailand, whereas O. sativa japonica was domesticated from wild rice in southern China.

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Section: Study Systemmentioning

confidence: 99%

“…and includes early evidence for domesticated melon, cucumber, almond, mango, root crops such as taro, and rice (4). Of all of the crops domesticated in the east Asian center, cultivated Asian rice, Oryza sativa, represents the world's most important agricultural species, feeding more people since the time of its domestication than any other crop (12).…”

mentioning

confidence: 99%

Phylogeography of Asian wild rice, Oryza rufipogon , reveals multiple independent domestications of cultivated rice, Oryza sativa

Londo

Chiang

Hung

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

609

466

View full text Add to dashboard Cite

show abstract

“…A more logical conclusion would therefore be that the rarity of Swatow wares at al-Mataf is to be explained by the fact that occupation was already at an end by the time they were introduced in the last half of the sixteenth century. This dating is supported by Sasaki who has studied and published a large amount of pottery from the site, most of which he places between the early fourteenth and the late sixteenth century (67). The earlier dating is also supported by the twenty-six coins that Lowick published from Julfar (68).…”

Section: Datingmentioning

confidence: 72%

“…were built over those of phase 2, but they respected the same street plan and property boundaries. The excavators suggest that the population decreased slightly compared to the previous phase, although they do not say why -presumably because the amount of domestic space declined (33).…”

Section: Phasementioning

confidence: 87%

Julfar and the urbanisation of Southeast Arabia

Kennet

2003

Arab Archaeol Epigr

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The fourteenth-sixteenth-century town of Julfar (al-Mataf) in Ras al-Khaimah (UAE) is one of the most fully investigated archaeological sites in the Gulf, having been the subject of seven different excavation projects. Evidence from the published reports, when brought together, provides a detailed and coherent picture of the development of the site from a small fishing community in the mid-fourteenth century to a fully urbanised settlement by the mid-fifteenth century, and then attests to its eventual decline and abandonment by the late sixteenth century.Julfar was the first example of true urbanism in this part of Arabia, and therefore marks a significant historical turning point. Its development is believed to have been linked to the expanding mercantile economy of Hormuz, but it occurred at the same time as a period of spectacular rural growth in its own immediate hinterland, evidence for which has been produced by archaeological field survey. Together these phenomena suggest the development of a local market economy, perhaps for the first time, which would have had significant implications for the social and economic structure of the area.

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“…The idea that the actual f gas in clusters should be universal is the starting point of an interesting cosmological test that has been proposed based on the apparent evolution of f gas with redshift (Sasaki 1996;Pen, 1997;Cooray 1998). The principle of this test is based on the fact that the inferred gas mass fraction from X-ray data depends on the assumed cosmology through the angular distance.…”

Section: Cosmological Applicationmentioning

confidence: 99%

The XMM-$\Omega$ project: gas mass fraction shape in high redshift clusters

Sadat

2004

IAU

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We study the gas mass fraction behavior in distant galaxy clusters observed within the XMM − Newton Ω project. The typical gas mass fraction f gas shape of high redshift galaxy clusters follows the global shape inferred at low redshift quite well, once scaled appropriately : the gas mass fraction increases with radius and flattens outward. This result is consistent with the simple picture in which clusters essentially form by gravitational collapse, leading to self similar structures for both the dark and baryonic matter. However, we find that the mean gas profile in distant clusters shows some differences to local ones, indicating a departure from strict scaling. Assuming an Einstein-de Sitter cosmology, we find a slight deficit of gas in the central part of high-z clusters. This result is consistent with the observed evolution in the luminosity-temperature relation. We quantitatively investigate this departure from scaling laws by comparing f gas from a sample of nearby galaxy clusters (Vikhlinin, Forman & Jones, 1999) to our eight high-z clusters. Within the local sample, a moderate but clear variation of the amplitude of the gas mass fraction with temperature is found, a trend that weakens in the outer regions. Taking into account these variations with radius and temperature, the apparent scaled gas mass fractions in our distant clusters still systematically differ from local clusters. This reveals that the gas fraction does not strictly follow a scaling law with redshift. This provides clues to understand the redshift evolution of the L − T relation whose origin is probably due to non-gravitational processes during cluster formation. An important implication of our results is that the gas fraction evolution, a test of the cosmological parameters, can lead to biased values when applied at radii smaller than the virial radius. From our XMM clusters, as well as Chandra clusters in the same redshift range, the apparent gas fraction at the virial radius obtained by extrapolation of the inner gas profile is consistent with a non-evolving universal value in a high matter density model while in a concordance, model high redshift clusters show an apparent higher f gas at the virial radius than to local clusters.

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Cited by 11 publications

References 28 publications

Phylogeography of Asian wild rice, Oryza rufipogon , reveals multiple independent domestications of cultivated rice, Oryza sativa

Phylogeography of Asian wild rice, Oryza rufipogon , reveals multiple independent domestications of cultivated rice, Oryza sativa

Julfar and the urbanisation of Southeast Arabia

The XMM-$\Omega$ project: gas mass fraction shape in high redshift clusters

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