3829 to 3840 of 14094 results
Median height distributions of electron concentration may be determined from ionograms by means of the composite ionogram technique of Wright, or by inserting tabulated parameters in the idealized model of […]
Most animal species reproduce sexually and fully parthenogenetic lineages are usually short lived in evolution. Still, parthenogenesis may be advantageous as it avoids the cost of sex and permits colonisation […]
Results of analysis of the diurnal variations of hmF2 for Argentine Islands (65°15’S, 64°16’W) and Halley Bay (75°30’S, 26°40’W) are presented. It is shown that, for summer months, the diurnal […]
A comparison has been mager between ice velocities that were measured by the radio-echo technique and by a survey method on the Devon Island ice cap, Arctic Canada (lat. 75° […]
An ice shelf is a floating ice sheet, attached to land where ice is grounded along the coastline. Nourished both by surface snow accumulation and by glaciers and ice sheets […]
The pattern of growth of Polytrichum alpestre Hoppe, a common moss in the maritime Antarctic, is described. It may form extensive communities, sometimes growing with another moss, Chorisodontium aciphyllum (Hook. […]
The stomach oil produced by many marine birds of the order Procellariiformes is an important aspect of their breeding ecology. Fifty-seven samples of stomach oil from six species of subantarctic […]