Geomorphic limits to climate-induced increases in topographic relief
Article Abstract:
There are four main mechanisms through which glacial erosion may produce topographic relief, according to research giving quantitative information about the processes of erosion and relief production. These mechanisms are ice buttressing of rock slopes, valley widening and formation of hanging valleys and overdeepenings. There are three mechanisms by which glacial erosion may lead to a reduction in some elements of relief. These are reduction of fluvial erosion downstream of glaciers, concentration of erosion at higher elevations and possible acceleration of summit-lowering rates in the near-glacial environment.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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The limits of selection during maize domestication
Article Abstract:
Research into the impact of selection during maize domestication has established that selection during domestication is linked with strongly reduced diversity in the non-transcribed region where regulatory sequences are generally found, but with more modestly reduced diversity in the transcriptional unit. An analysis of nucleotide polymorphism in teosinte branched1, a gene involved in maize evolution, indicates that selection during maize domestication was aimed at the non-transcribed region.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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The limits to growth
Article Abstract:
Scientific researchers led by Falkowski have discovered that nitrogen is the ultimate controlling nutrient that limits carbon fixation in oceanic plants. To arrive at this conclusion, Falkowski examined the origin of enzyme systems involved in the fixation and denitrification of nitrogen. The low solubility of iron limited the fixation of nitrogen in oceanic waters during a certain period in the Earth's history.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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