Suchergebnisse

The movements of ducks to refuges in response to hunting pressure were investigated during the opening
of the 1981 duck season. Grey teal, Pacific black duck, hardhead and Australasian shoveler actively
sought refuge whilst pink-eared duck did not. Some implications for management are discussed.

The summer of 1969 saw astronauts land on the moon for the first time and hippie hordes descend on Woodstock for a legendary music festival. For Neil M. Maher, the conjunction of these two era-defining events is not entirely coincidental. Apollo in the Age of Aquarius shows how the celestial aspirations of NASA's Apollo space program were tethered to terrestrial concerns, from the civil rights struggle and the antiwar movement to environmentalism, feminism, and the counterculture. With its lavishly funded mandate to send a man to the moon, Apollo became a litmus test in the 1960s culture wars. Many people believed it would reinvigorate a country that had lost its way, while for others it represented a colossal waste of resources needed to solve pressing problems at home. Yet Maher also discovers synergies between the space program and political movements of the era. Photographs of "Whole Earth" as a bright blue marble heightened environmental awareness, while NASA's space technology allowed scientists to track ecological changes globally. The space agency's exclusively male personnel sparked feminist debates about opportunities for women. Activists pressured NASA to apply its technical know-how to ending the Vietnam War and helping African Americans by reducing energy costs in urban housing projects. Particularly during the 1970s, as public interest in NASA waned, the two sides became dependent on one another for political support. Against a backdrop of Saturn V moonshots and Neil Armstrong's giant leap for mankind, Apollo in the Age of Aquarius brings the cultural politics of the space race back down to planet Earth

Introduction -- Politics, language ideologies and the changing shape of language policy processes -- Language-in-education: a dominant monolingual ideology in tension with multilingual practices -- Local/Global trajectories -- Representation/performance of diversities -- Internationalization and new diversities in higher education: Policies and practices 'on the ground' -- Afterword

Normal human cells in culture have never been neoplastically transformed by carcinogen exposure. One possible explanation is that the life span of such cells is too short for them to acquire the necessary changes. To test this hypothesis, we needed normal human cells with a greatly extended or an infinite life span. We transfected the v‐myc gene and a selectable marker into normal human fibroblasts, identified a drug‐resistant clone expressing v‐myc protein, and passaged the progeny of the clone until they senesced. A few cells continued to proliferate and gave rise to a diploid, infinite life span cell strain, MSU‐1.0, that has normal growth control and is nontumorigenic in athymic mice. Analysis showed that one more genetic change, in addition to unregulated expression of the v‐myc gene, was involved in generating MSU‐1.0 cells. They spontaneously gave rise to a variant strain, designated MSU‐1.1, that grows more rapidly and is less dependent on exogenous growth factors. Analysis showed that at least two additional changes were involved in generating this cell strain. It has a stable karyotype composed of 45 chromosomes, including two markers. Transfection of specific oncogenes was used to determine the number and nature of additional changes required to transform MSU‐1.1 cells into malignant cells. Analysis indicated that two changes were involved, but no change in karyotype. Exposure of MSU‐1.1 cells to a single carcinogen treatment, followed by selection for cells with the characteristics of oncogene‐trans‐formed MSU‐1.1 cells also yielded malignant human cells. We conclude that malignant transformation of normal human fibroblasts requires six or seven genetic changes, some of which involve suppressor genes.

Populations of waterfowl of three game species, the Pacific black duck Anus superciliosa, grey teal
A. gibberifrons, and maned duck Chenonetta jubata, were assessed by aerial survey in October 1983
within a survey region of 2 697 000 km2 of eastern Australia. The numbers of each species were
assessed on all surface waters of over 1 ha, and on a sample of smaller surface waters within 10 survey
bands each 30 km wide and spaced at intervals of 2� latitude from 20�30' to 38�30'S. The area within
the survey bands was 324 120 km2, which gave a sampling intensity of 12.0% of the land surface area.
The area of features shown as wetlands or water impoundments within the survey bands on 1 : 2 500 000
topographic maps was 19 200 km2 or 11.2% of the total area of these features in the survey region.
The area of surface waters surveyed was assessed at 465 300 ha. Assessments of populations of each species
were tallied for wetlands by grid cells of 6 min of 1� longitude along the survey bands (258-309 km2
depending on latitude). Distributions were then mapped, with log*10 indices of populations in each cell.
Distributions of the black duck and grey teal showed a pattern of intense aggregation in limited numbers
of cells, that of the maned duck was more evenly distributed. The major concentrations of the Pacific black
duck were recorded in northern New South Wales and the south-eastern, western, central eastern and
central coastal regions of Queensland; those of the grey teal were in south-western, western and northern
New South Wales and central-eastern Queensland; the maned duck was broadly distributed over inland
New South Wales with the exception of the far west, inland southern Queensland, and central northern
Victoria.