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We reconstruct long-term vegetation/paleoclimatic trends, spanning the last 18 million years, in Alaska, Yukon and far western Northwest Territories. Twenty-one average percentage spectra for pollen… (More)
Scientists' work is often evaluated using citation statistics compiled by a company called the ISI. But how useful and reliable are the data? David Adam gets the measure of citation analysis.
Historic fluctuations and late Quaternary deposits of Tulare Lake, in the southern San Joaquin Valley, indicate that maximum lake size has depended chiefly on the height of a frequently overtopped… (More)
Pollen analysis of a 115-m sediment core from Clear Lake, Lake County, California, provides a climatic record that is continuous for the past 130,000 yr. The pollen record reflects migrations of the… (More)
Research suggests that mental illnesses lie along a spectrum — but the field's latest diagnostic manual still splits them apart.
Authigenic greigite (Fe 3 S 4 ) has been identified in several horizons of lake beds in a 102-m core from Butte Valley, northern California, using mineral magnetic methods and x-ray diffraction… (More)
The goal of this paper is to examine a single representation language, SRL, and its applications to determine utility of its ideas. Post mortems have been performed before but have the appearance of… (More)
An international team of chemists is working on something that chemistry sorely lacks — a consistent and comprehensive way of labelling all chemical compounds. The new technique will apply computer… (More)
Recent controversies over scientific fraud and other disputed findings have raised questions over the way in which journals select papers for publication. Is there a problem? And what more could be… (More)
Many Chrysophyte algae produce morphologically distinctive, siliceous, microscopic cysts during a resting stage of their life cycles; these cysts are often preserved in sediments. Scanning electron… (More)