Showing 11876 items
1 January, 1987
A model has been constructed which grafts IRI topside profiles to field-aligned diffusive equilibrium profiles at a “reference level” near 650 km altitude. For different values of geographic latitude, longitude,…Read more on A suggested model for the IRI plasmapheric distribution
1 January, 1987
The impacts of pollution resulting from large explosive volcanic eruptions on the atmospheric heat budget and planetary albedo are not in doubt1,2. However, the effects of volcanic aerosols on the…Read more on Global surface-temperature responses to major volcanic eruptions
1 January, 1987
The plasmapause and the mid-latitude ionospheric trough have been observed simultaneously from two Antarctic stations, Halley and Faraday, during five winter nights covering a range of geomagnetic disturbance conditions. The…1 January, 1987
The soluble carbohydrate and polyhydric alcohol (polyol) content of fruticose lichens, cushion mosses and early vegetative colonizers of maritime Antarctic fellfield soils were examined by gas-liquid chromatography during 18 months.…1 January, 1987
Gas liquid chromatography and a commercially available strip of 20 conventional biochemical tests were used for the rapid sorting of strains of environmental bacterial isolates into similar ecophysiological groups. This…1 January, 1987 by Peter Ward
The reproductive biology of the predatory calanoid copepod Euchaeta antarctica Giesbrecht was investigated in two interconnected fjord systems at South Georgia. Counts of the number of spermatophores attached to adult…1 January, 1987
New analysis procedures are used to show that the main phase mid-latitude storm effects conform to consistent patterns in local time when suitable selection rules are applied, with averaging over…15 November, 1986
A year‐long tidal record has been obtained from beneath the George VI Ice Shelf, Antarctica. An unusual feature of the record is a significant response in tidal species 3 to…Read more on The tidal spectrum underneath Antarctic ice shelves
1 November, 1986
We have examined the variations of electron precipitation at L ≈ 4 as inferred from riometer measurements of cosmic radio noise absorption made during 1975 at Siple Station and Halley…1 September, 1986
Nonthermal continuum is observed at 1.2 kHz on Voyagers 1 and 2 within the Jovian magnetosphere. It is seen in the magnetospheric cavity on both the dayside and nightside, being…1 July, 1986
A series of 50 male and 42 female mites of the prostigmatid family Tydeidae from the maritime Antarctic were each scored for 67 morphological characters. Ordination of each data set…1 June, 1986
Blood samples were collected from free-living incubating Diomedea albatross during single incubation shifts, both daily (wandering albatross D. exulans and every 2 days (grey-headed albatross D. chrysostoma and black-browed albatross…Read more on Corticosterone secretion through long incubation shifts in Diomedea albatrosses
1 June, 1986 by Alistair Crame
As a result of recent field work, a new lithostratigraphic group is defined on the west coast of James Ross Island, Antarctica. Characterised by comparatively coarse-grained sediments, the Gustav Group…Read more on Lithostratigraphy of the Cretaceous strata of west James Ross Island, Antarctica
1 February, 1986
Gonadal size and the circulating concentrations of two pituitary hormones (luteinizing hormone and prolactin) and three gonadal steroids (testosterone, progesterone and oestradiol‐17β) were measured in two closely related Diomedea albatrosses…1 February, 1986
(1) A sampling programme has been designed to detect whether multiple scales of pattern (or aggregation) occur in arthropod distributions. A secondary aim was to relate arthropod pattern with environmental…1 January, 1986
Se describen areniscas del Cretacico Superior, expuestas en las cercanias de Punta Arenas, sur de Chile, las que exhiben laminacion convoluta y estratificacion cruzada, tipo "hummocky". Estas capas se formaron…1 January, 1986
1. Single fast and small bundles of slow fibres were isolated from the muscles of an elasmobranch (dogfish, Scyliorhinus canicula) and an Antarctic teleost (Notothenia neglecta). A third fibre type…1 January, 1986
1. Force and ATPase activity were measured in skinned, fast muscle fibres isolated from the myotomes of Antarctic, temperate and tropical fish. 2. Maximum isometric tension was inversely related to…1 January, 1986
Samples of adult Alaskozetes antarcticus, an Antarctic cryptostigmatid mite, were collected in winter and summer. In 4 separate experiments, mites were maintained under relative humidities in the range: 0, 26,…Read more on Effects of contrasting relative humidities on the cold tolerance of an Antarctic mite
1 January, 1986
Samples of a cryptostigmatid mite, Alaskozetes antarcticus, were collected during summer and winter on Signy Island, South Orkney Islands, in the maritime Antarctic. In four experiments, adult mites were maintained…Read more on Effects of ingestion of liquids on the cold tolerance of an Antarctic mite
1 January, 1986
On occasion the third hop of an echoing magnetospheric whistler exceeds the first hop in intensity over some low range of frequencies. Case studies show that this anomalous behavior can…Read more on The third hop whistler anomaly: possible evidence of df/dt-dependent wave amplification
1 January, 1986 by Andrew Clarke
The decapods Pasiphaea scotiae (Stebbing), P. rathbunae (Stebbing), Petalidium foliaceum Bate and Acanthephyra pelagica (Risso) and the mysid Gnathophausia gigas (W.-Suhm) have been sampled from the Southern Ocean. Lipid contents…Read more on Lipid content and composition of some midwater crustaceans from the Southern Ocean
1 January, 1986 by Andrew Clarke
86Rb uptake was examined in two species of unicellular green algae, Chlamydomonas nivalis isolated from snow, and a cell wall-less mutant of the temperate freshwater Chlamydomonas reinhardii. In C. reinhardii…1 January, 1986
Since 1981, the British Antarctic Survey has flown 27 000 line kilometres over Ronne Ice Shelf, during which radio-echo ice thicknesses were recorded. An earlier map of ice thickness was…1 January, 1986 by Alistair Crame
Bipolar bivalve genera probably existed through the greater part of late Mesozoic (i.e. late Jurassic–late Cretaceous) time. Of the various theories put forward to account for their presence, those based…1 January, 1986
Rates of disappearance of dead material of Polytrichum alpestre and Chorisodontium aciphyllum from a moss turf community and of Drepanocladus uncinatus, Calliergon sarmentosum and Cephaloziella varians from a moss carpet…Read more on Environmental factors influencing decomposition rates in two Antarctic moss communities
1 January, 1986
A simple user interactive technique that allows digital ionosonde sky map echo location data to be dealiased uniquely is described. Unambiguous tracking of large‐scale ionospheric features is thus made possible.…Read more on A simple graphical method for dealiasing digital ionosonde echo location data
1 January, 1986
The availability of representative empirical models of the variation of the electron concentration with height in the ionosphere is one critical element in the development of practical schemes for providing…1 January, 1986
Immediate-energy-supply pathways were analysed during burst-swimming in white muscle of the Antarctic fish Notothenia neglecta, (collected during Austral summer 1984 near Signy Island, South Orkneys). Selected enzyme activities were determined,…Read more on Metabolic constraints on burst-swimming in the Antarctic teleost Notothenia neglecta
1 January, 1986
The effectiveness of the Rectangular Midwater Trawl (RMT) for sampling krill swarms was studied by observing the behaviour of swarms in the vicinity of the net using echosounders. Large scale…Read more on Effectiveness of the RMT8 system for sampling krill (Euphausia superba) swarms
1 January, 1986 by Jane Francis
Although the Antarctic Peninsula now has a glacial climate, during the Cretaceous and early Tertiary it was sufficiently warm for forests to thrive, even at palaeolatitudes of 59°-62° S. The…1 January, 1986
The reproductive endocrinology of the Wandering Albatross Diomedea exulans was studied at South Georgia to investigate the potential endocrine correlates of biennial breeding and of the acquisition of sexual maturity.…1 January, 1986 by Jonathan Shanklin
Measurements of total ozone at Halley Bay, Antarctica, are presented for the six most recent observing seasons, 1980‐86, showing the consistency and progress of the spring ozone depletion. The principal…Read more on Recent measurements of Antarctic ozone depletion
1 January, 1986
We present results from the analysis of magnetometer measurements of one of the clearest observations of a double resonance Pc4 pulsation to date. The Pc4, with a period of 55…1 January, 1986
Rock moisture content is a major control of mechanical weathering, particularly freeze‐thaw, and yet almost no data exist from field situations. This study presents moisture content values for rocks, taken…1 January, 1986
The dark respiration of field‐fresh thalli of Umbilicaria antarctica Frey et Lamb is reported for temperatures from −5.5 to 19°C, and water contents from saturation to dryness. Detailed analysis of…1 January, 1986
VLF goniometers have been used to study the direction of plasma convection in the evening plasmasphere. The results suggest that sometimes even for L values greater than 4 the electric…Read more on Further evidence for the ionospheric contribution to convection within the plasmasphere
1 January, 1986
The reconfiguration of both the receiver dipole array and the pulse set used by the National Oceanic and Atmospheric Administration (NOAA) HF radar enables all ambiguity in polarization to be…1 January, 1986
One of the many discoveries by Voyagers 1 and 2 during their flyby of Jupiter was the detection of radio emission at kilometric wavelengths1,2 in the frequency range 20–500 kHz.…Read more on Io plasma torus and the source of jovian kilometric radiation (bKOM)
1 January, 1986
The carriage of Staphylococcus aureus was studied in a group of 28 men living in a totally isolated environment for a year. Initially, nasal, axillary and perineal swabs were taken…Read more on Staphylococcus aureus in Antarctica: carriage and attempted eradication
1 January, 1986
Extracellular proteins produced by Staphylococcus aureus strains were examined by Western Blot analysis with blood donor plasma as a source of antibodies. Comparison of epidemiologically related strains showed strong concordance…1 January, 1986
A dominance hierarchy developed within a wintering flock of Greater Sheathbills which fed regularly at a concentrated artificial food source. Each bir's dominance position was determined from the proportion of…1 January, 1986
Determination of geographically dependent sedimentological variation (‘proximality’) in ancient flysch deposits formed an important part of early turbidite studies. Attempts to quantify this variation highlighted anomalies which were neatly resolved…1 January, 1986
A model involving repeated NNW-directed ductile thrusting in subduction complex rocks on Signy Island. South Orkney Islands, accounts for the consistent NNW-trending alignment of fold axes, stretching and shearing directions.…Read more on Ductile thrusting within subduction complex rocks on Signy Island, South Orkney Islands
1 January, 1986 by Andrew Clarke, Lloyd Peck
The metabolism of the Antarctic brachiopod Liothyrella uva (Jackson, 1912) has been investigated in the laboratory under simulated winter conditions of low temperature and no food. Under such conditions the…1 January, 1986
Summary 1. The Southern Ocean is a large‐scale, relatively homogeneous upwelling ecosystem whose phytoplankton apparently grows suboptimally over much of its area. By contrast there is a wide variety of…Read more on Antarctic aquatic ecosystems as habitats for phytoplankton
1 January, 1986
Data on phytoplankton and zooplankton biomass, and physical and chemical variables, are combined with a published multivariate description of diatom species composition to interpret variation within an area around South…1 January, 1986
The c. 6 km2 complex comprises graphitic/pyritic, mainly kyanite-rich pelites, interbanded with metalimestones and invaded by foliated serpentinites. It is enveloped by typically Moinian psammites, semipelites and pelites. Previously regarded…1 January, 1986
Data from the Advanced Ionospheric Sounder (AIS) deployed at Halley, Antarctica (76°S, 27°W; L = 4.2) and the Dynamics Explorer-2 spacecraft (DE-2) are used to investigate several aspects of the…Read more on The poleward edge of the mid-latitude trough—its formation, orientation and dynamics