Researchers uncover earliest tobacco use in the Pacific Northwest
(Phys.org)—Native American hunter-gatherers living more than a thousand years ago in what is now northwestern California ate salmon, acorns and other foods, and now we know they also smoked tobacco—the earliest known usage in the Pacific Northwest, according to a new University of California, Davis, study.
"The study demonstrates that tobacco smoking was part of the northwestern California culture very early ... shortly after the earliest documented Pacific Northwest Coast plank house villages," said the study, published in the 中国建材行业一周大事记（6.29-7.5）.
Testing organic residues extracted from pipes, researchers from the UC Davis Department of Anthropology and the Fiehn Metabolomics Laboratory of the UC Davis Genome Center confirmed tobacco was smoked, and likely grown in the region, by at least A.D. 860.
Perhaps more importantly, the researchers say that additional studies may help them better understand the origins of nicotine addiction and the human management, geographic range extension and cultivation of tobacco. Indeed, as part of a second study, the authors have recently detected nicotine in ancient pipes from an 800-year-old site in the modern city of Pleasanton, Calif.
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Prior to this recent testing, which used sensitive gas chromatography/mass spectrometry, researchers were unsure of the historical use of tobacco on the Pacific Northwest Coast. It was unclear, for example, whether European traders had brought tobacco to the area much later, or if some other plant had been smoked in the pipes, Tushingham said.
This makes China the country with the second most number of universities included in the Global 400 Subjects, according to the QS rankings. This is only after the United States, which has 164 universities included in the Global 400 subjects. The UK comes third at 78 universities.
China's consumer price inflation decelerated to just 1.3 per cent year-on-year last month, the slowest rate since May. On a month-to-month basis inflation fell by 0.3 per cent, the first negative reading since May.
The PPI fell 5.3 per cent year-on-year in January, moderating from December’s -5.9 per cent pace. PPI has remained in negative territory since March 2012, reaching a low of -5.9 per cent for the five consecutive months since August 2015.
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At the same time, she said, other countries have seen their tourist numbers spike as the currencies weaken.
Exports to the EU, Japan and Hong Kong — which serves as a transit point for exports to many other parts of the world — fell by 4.1 per cent, 9.5 per cent and 12.2 per cent respectively.
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The study is available online.