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  • 1
    Electronic Resource
    Electronic Resource
    A comparison of electrical and chemical profiling of doping superlattices in silicon (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 1740-1743 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Molecular-beam epitaxy was used to grow vertical silicon structures with extremely sharp doping transitions. Hereby a series of modulation-doped multilayer structures was prepared which had successively reduced period lengths from 100 down to 4 nm. These test samples are appropriate to study the depth resolution of standard electrical and chemical profiling techniques. Secondary ion mass spectrometry is able to resolve doping modulations down to 4 nm. Electrical measurement techniques are fundamentally limited by the out-diffusion of carriers from the highly to the lowly doped layers. Such effects become of increased importance in small period superlattices. Spreading resistance is only able to resolve the doping modulations of the test sample with the largest period length (100 nm).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345623
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of temperature and photoperiod on growth and development of Parthenium hysterophorus L. (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 20 (1980), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Germination, growth and flowering were investigated in Parthenium hysterophoms (Asteraceae), a species introduced to Australia and at present occurring as a weed in central Queensland. Combinations of day/night temperature regimes from 15/4 to 36/31 and day length of 10, 13 and 16 h in controlled conditions were examined to find the effects of any environmental restraints to growth and development. Results showed that individuals are able to germinate, grow and flower over a wide range of temperatures and photoperiods and established plants can survive at least one mild frost of — 2.We conclude that the potential distribution of P. hyslerophorus in Australia is much wider than at present. Future distribution of the species may be limited seasonally by the inability of seed to germinate in soils of low water potential and by the inability of seedlings to establish and grow at low light intensities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1980.tb00040.x
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of the rust fungus Puccinia chondrillina TU 788 on plant size and plant size variability in Chondrilla juncea (2002)
    Oxford, UK : Blackwell Science Ltd
    Weed research 42 (2002), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Chondrilla juncea is one of the most serious introduced weed species in Australia. Successful biological control has been achieved by the release of the rust fungus Puccinia chondrillina. Although P. chondrillina is thought to reduce the competitive ability of C. juncea by reducing plant size, the precise mechanism by which the pathogen controls its host is poorly understood. In this experiment, we examined the effect of P. chondrillina TU 788 infection on individual plant size, and size variability, in two genotypes (one resistant, one susceptible) of C. juncea. Exposure to P. chondrillina significantly reduced the average size of susceptible C. juncea plants, a reduction apparent in both roots and shoots. Plant size variability of the susceptible C. juncea genotype was also reduced by P. chondrillina. Plant size, and plant size variability of the resistant genotype were unaffected by exposure to rust, or association with rust-affected plants. The effect of P. chondrillina on plant size in rust-susceptible C. juncea plants shows how effective bio-control of this weed may occur in field populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3180.2002.00297.x
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  • 4
    Electronic Resource
    Electronic Resource
    Competition between Australian native and introduced grasses along a nutrient gradient (2003)
    Oxford, UK : Blackwell Science Pty
    Austral ecology 28 (2003), S. 0 
    Details
    ISSN: 1442-9993
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract  Seven grass species were grown in monocultures and in multispecies mixtures along a gradient of total nutrient levels that ranged from 1/64 to 16× the normal level of nutrient solution. The seven grasses represented three ecological groups: (i) three perennial species native to Australia (Themeda triandra, Poa labillardieri and Danthonia carphoides); (ii) two introduced annuals (Vulpia bromoides and Hordeum leporinum); and (iii) two introduced perennials (Lolium perenne and Dactylis glomerata). We hypothesized that the native grasses would prove less competitive when grown at increased nutrient levels than those introduced from Europe. Results supported the hypothesis. The native species were unable to compete in mixtures even at the lowest nutrient level, where T. triandra was the most productive species in monoculture. Lolium perenne and Dactylis glomerata dominated mixtures at intermediate nutrient levels. The responses of the annual introduced grasses differed in that Vulpia bromoides showed an optimum at intermediate nutrient levels in both monoculture and in mixtures, whereas Hordeum leporinum dominated at the highest nutrient levels in mixture but was suppressed by V. bromoides, L. perenne and D. glomerata at intermediate levels. The results are discussed in terms of predicting species responses in mixtures from their performance in monocultures as well as in terms of previous observations on the sequential changes in botanical composition of south-eastern Australian grasslands after 150 years of continuous grazing by sheep.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1442-9993.2003.01305.x
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  • 5
    Electronic Resource
    Electronic Resource
    TAX AND THE INTEGRATION OF FINANCE AND INVESTMENT (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of business finance & accounting 6 (1979), S. 0 
    Details
    ISSN: 1468-5957
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-5957.1979.tb01081.x
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  • 6
    Electronic Resource
    Electronic Resource
    Exfoliation of Vermiculite by Chemical Means (1939)
    [s.l.] : Nature Publishing Group
    Nature 144 (1939), S. 554-554 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Specimens of vermiculite from different localities have been examined in the laboratories of the Mineral Resources Department of the Imperial Institute in the course of an investigation into possible Empire sources of supply, and an interesting phenomenon has been observed in connexion with the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/144554a0
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  • 7
    Electronic Resource
    Electronic Resource
    A comparison between SIMS and spreading resistance profiles for ion implanted arsenic and boron after heat treatments in an inert ambient
    Amsterdam : Elsevier
    Physica B+C 129 (1985), S. 181-186 
    Details
    ISSN: 0378-4363
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4363(85)90565-0
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  • 8
    Electronic Resource
    Electronic Resource
    Dulwich College: Extension to the Laboratories (1957)
    [s.l.] : Nature Publishing Group
    Nature 180 (1957), S. 1033-1034 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THERE can be few people now who are not convinced that the British public schools are aware of the country's need of scientific man-power. Not only is the teaching of science in these schools thoroughly 'respectable' now, but also the numbers specializing in science in the sixth forms are often ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1801033a0
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  • 9
    Electronic Resource
    Electronic Resource
    Competition in mixtures of susceptible and resistant genotypes of Chondrilla juncea differentially infected with rust (1984)
    Springer
    Oecologia 64 (1984), S. 199-203 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plants of two genotypes of Chondrilla juncea (skeleton weed), one susceptible to and the other resistant to one isolate of the rust Puccinia chondrillina, were grown as pure and mixed populations both in the presence and absence of rust. Weights of individual plants were obtained at two harvests, one when the plants were rosettes and the other when flowering had begun. Distributions of plant weights of each genotype became progressively more positively skewed with time, with rust infection of plants of the susceptible genotype and with increasing competition between plants of both genotypes. The results show that genetic differences may be an important factor in determining which individuals become dominant or are suppressed in competing mixtures, and that differential disease pressure may alter dominance of individuals in plant populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376871
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  • 10
    Electronic Resource
    Electronic Resource
    Physiological determinants of growth rate in response to phosphorus supply in wild and cultivated Hordeum species (1989)
    Springer
    Oecologia 79 (1989), S. 96-105 
    Details
    ISSN: 1432-1939
    Keywords: Allocation ; Growth ; Phosphorus ; Photosynthesis ; Seed size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Under favorable nutrition, accessions of the weedy barleygrass (Hordeum leporinum and H. glaucum) had a higher relative growth rate (RGR) than did accessions of cultivated barley (H. vulgare) or its wild progenitor (H. spontaneum). RGR was not positively correlated with the presumed level of soil fertility at the collection site of an accession either within or among species. RGR was reduced more strongly by low-P supply in the progenitor than in the crop or weed, indicating that selection of cultivars to grow in fertile soils had not reduced their potential to grow effectively under low-P conditions. Seed and embryo masses were more important than RGR in determining plant size. Relative differences among assessions in plant size declined with time, because (1) accessions with small seeds had a higher RGR, and (2) RGR of large-seeded accessions declined with time. Absolute growth rate correlated positively with leaf area and negatively with photosynthetic rate per unit leaf area. Under favorable nutrition, maximum photosynthetic rate correlated negatively with leaf length and therefore was higher in the weeds than in the crop or progenitor accessions. P absorption potential did not differ consistently among species but generally increased in response to P stress. Cultivars produced a few tall tillers, whereas weeds and progenitors produced many small tillers. The cultivar had a larger proportion of reproductive tillers, allocated a larger proportion of biomass to grain, and produced larger grains than did the weedy accession. By contrast, the weed began maturing seeds sooner, produced more reproductive tillers, and produced more grains per car and per plant than did the cultivar. The study suggests two major conclusions: (1) A low RGR is not an adaptation to low P supply in annual Hordeum species. (2) Seed size is the major determinant of early plant size between accessions in these Hordeum species under favorable nutrition. However, large seed size indirectly results in a low RGR because of the inverse relationship between plant size and RGR and results in a low photosynthetic rate because of the inverse relationship between leaf size and photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378245
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