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81.
82.
Effects of basal debris on glacier flow 总被引:1,自引:0,他引:1
Iverson NR Cohen D Hooyer TS Fischer UH Jackson M Moore PL Lappegard G Kohler J 《Science (New York, N.Y.)》2003,301(5629):81-84
Glacier movement is resisted partially by debris, either within glaciers or under glaciers in water-saturated layers. In experiments beneath a thick, sliding glacier, ice containing 2 to 11% debris exerted shear traction of 60 to 200 kilopascals on a smooth rock bed, comparable to the total shear traction beneath glaciers and contrary to the usual assumption that debris-bed friction is negligible. Imposed pore-water pressure that was 60 to 100% of the normal stress in a subglacial debris layer reduced shear traction on the debris sufficiently to halt its deformation and cause slip of ice over the debris. Slip resistance was thus less than debris shearing resistance. 相似文献
83.
84.
Cohen J 《Science (New York, N.Y.)》2003,299(5611):1290-1291
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86.
Cohen J 《Science (New York, N.Y.)》2007,318(5853):1048-1049
87.
P T Ninan T M Insel R M Cohen J M Cook P Skolnick S M Paul 《Science (New York, N.Y.)》1982,218(4579):1332-1334
The ethyl ester of beta-carboline-3-carboxylic acid has a high affinity for benzodiazepine receptors in the brain. In the rhesus monkey this substance produces an acute behavioral syndrome characterized by dramatic elevations in heart rate, blood pressure, plasma cortisol, and catecholamines. The effects are blocked by benzodiazepines and the specific benzodiazepine receptor antagonist Ro 15-1788. The benzodiazepine receptor may consist of several subsites or functional domains that independently recognize agonist, antagonists, or "active" antagonists such as beta-carboline-3-carboxylic acid ethyl ester. These results suggest that the benzodiazepine receptor is involved in both the affective and physiological manifestations of anxiety, and that the administration of beta-carboxylic acid ethyl ester to monkeys may provide a reliable and reproducible animal model of human anxiety. 相似文献
88.
Wright AD Sampson MB Neuffer MG Michalczuk L Slovin JP Cohen JD 《Science (New York, N.Y.)》1991,254(5034):998-1000
The maize mutant orange pericarp is a tryptophan auxotroph, which results from mutation of two unlinked loci of tryptophan synthase B. This mutant was used to test the hypothesis that tryptophan is the precursor to the plant hormone indole-3-acetic acid (IAA). Total IAA in aseptically grown mutant seedlings was 50 times greater than in normal seedlings. In mutant seedlings grown on media containing stable isotopelabeled precursors, IAA was more enriched than was tryptophan. No incorporation of label into IAA from tryptophan could be detected. These results establish that IAA can be produced de novo without tryptophan as an intermediate. 相似文献
89.
Cohen J 《Science (New York, N.Y.)》2004,304(5676):1434-1435
90.
Cohen J 《Science (New York, N.Y.)》2000,288(5474):2156-2159
Science lists the major collaborative research projects throughout sub-Saharan Africa. This list will be updated periodically at www.sciencemag.org/feature/data/africacollaborations.shl. Please send additions and changes to science_news@aaas.org. 相似文献