7237 to 7248 of 14064 results
The major flavonoid constituents of the Antarctic grass, Deschampsia antarctica, are shown to be the C-glycosylflavones, isoswertiajaponin (7-O-methylorientin) 2′’-O-β-arabinopyranoside and orientin. These are accompanied by lower levels of orientin 2′’-O-arabinopyranoside, […]
Spectral measurements of the solar UV irradiance at the earth’s surface depend critically on the characteristics of the spectroradiometers and the procedures used in their calibration. Two UV spectroradiometers were […]
Mid-Cretaceous igneous rocks of central Marie Byrd Land, Antarctica record a rapid change from subduction-related to rift-related magmatism. This correlates with the final stages of subduction of the Phoenix plate […]
Turning international agreement into national law has never been rapid or simple. Each country has its own parliamentary procedures, its own legal system and its own cultural interpretation of what […]
The Protocol on Environmental Protection to the Antarctic Treaty (1991) requires the environmental monitoring of human activities carried out in Antarctica. The objective of such monitoring is to collect environmental […]
It is hard to divorce most human activities, including science, completely from politics. Politics is about perceived certainty whilst science is about doubt – they make strange bedfellows. Politicians detest […]
The positions of ice-stream grounding zones are uniquely sensitive to changes in the mass balance of the ice sheet. Present methods for locating groundingzone features are either imprecise or require […]