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  • 1
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    Size distribution of Baobabs on Kubu "Island", Sowa Pan (northern Botswana): an indicator of late-stage evolution of the Makgadikgadi palaeo-lake and climate change? (2016)
    Geological Society of South Africa (GSSA)
    Details
    Publication Date: 2016-12-02
    Description: We have investigated the size class distribution (SCD) of baobabs on a rocky outcrop, known alternatively as Kubu or Lekhubu, located in the southwest of Sowa Pan, northern Botswana. This study is aimed primarily at determining whether baobab girths show any systematic distribution relative to elevation, linked to palaeo-lake levels during the late Holocene. A secondary objective was to determine whether the SCD of the species might reflect late Holocene climatic changes. Our data show no systematic link between baobab size and elevation, and that the distribution of the species on the outcrop does not provide evidence for former levels of the palaeo-lake. Rather, the population structure is strongly influenced by large, old baobabs, which have provided localized long-lived seed centres favourable for sporadic germination and recruitment to the Kubu population. The broadly unimodal SCD of the Kubu baobab population does not appear to reflect climate changes over the lifespan of the species (up to ~1500 years). This is most likely linked to the development pattern of the species, with rapid growth over the first quarter to half of the tree’s life, followed by subsequent very slow growth rates.
    Print ISSN: 1012-0750
    Topics: Geosciences
    Published by Geological Society of South Africa (GSSA)
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  • 2
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    GTF2IRD1 in craniofacial development of humans and mice (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-11-19
    Description: Craniofacial abnormalities account for about one-third of all human congenital defects, but our understanding of the genetic mechanisms governing craniofacial development is incomplete. We show that GTF2IRD1 is a genetic determinant of mammalian craniofacial and cognitive development, and we implicate another member of the TFII-I transcription factor family, GTF2I, in both aspects. Gtf2ird1-null mice exhibit phenotypic abnormalities reminiscent of the human microdeletion disorder Williams-Beuren syndrome (WBS); craniofacial imaging reveals abnormalities in both skull and jaws that may arise through misregulation of goosecoid, a downstream target of Gtf2ird1. In humans, a rare WBS individual with an atypical deletion, including GTF2IRD1, shows facial dysmorphism and cognitive deficits that differ from those of classic WBS cases. We propose a mechanism of cumulative dosage effects of duplicated and diverged genes applicable to other human chromosomal disorders.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tassabehji, May -- Hammond, Peter -- Karmiloff-Smith, Annette -- Thompson, Pamela -- Thorgeirsson, Snorri S -- Durkin, Marian E -- Popescu, Nicholas C -- Hutton, Timothy -- Metcalfe, Kay -- Rucka, Agnes -- Stewart, Helen -- Read, Andrew P -- Maconochie, Mark -- Donnai, Dian -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2005 Nov 18;310(5751):1184-7. Epub 2005 Nov 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Academic Unit of Medical Genetics, University of Manchester, St. Mary's Hospital, Manchester M13 9PL, UK. m.tassabehji@manchester.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16293761" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Animals ; Cell Line ; Child ; Child, Preschool ; Chromosomes, Human, Pair 7 ; Craniofacial Abnormalities/*genetics ; Face/*embryology ; Female ; Gene Deletion ; Goosecoid Protein/genetics/physiology ; Homozygote ; Humans ; Infant ; Infant, Newborn ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Inbred CBA ; Mice, Transgenic ; Muscle Proteins/*physiology ; Nuclear Proteins/*physiology ; Skull/*embryology ; Trans-Activators/*physiology ; Transcription Factors, TFII/physiology ; Williams Syndrome/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    A Bio-Economic Assessment of the West Coast Deep-Sea Hake Fishery with Referede to the Optimal Utitlization and Management of the Resource. (2005)
    CEEPA
    Details
    Publication Date: 2021-05-19
    Description: The cooperative versus non-cooperative management of the South African west coast hake stock is explored using game theoretic modelling in conjunction with an age-structured model. The age-structured model is used to produce a physical flow account for input into national resource accounts. Between 1989 and 1998, the average catch of hake on the west coast was 92000 tons, most of which was harvested by the demersal trawl sector. The physical flow account indicates that the conservative re-building management strategy pursued for the fishery over the same time period mentioned above, has resulted in a 29% increase in the demersal trawl catch over the last decade. We simulated the effects of alternative quota restrictions on two fishing sectors (the established demersal trawl fleet and the new longline sector) that compete for the rights to fish the stock. The results from the bio-economic analysis (which forms a basis for a monetary flow account as we calculate the Net Present Value of the stock) indicate that the greatest rent can be obtained by allocating a share of the total allowable catch (TAC) to longliners. This share that achieves the greatest benefits approximates the current TAC allocations to each sector under the present conservative management policy implemented by the management authority, assuming one takes into account the uncertainties inherit in a computational exercise like ours. This outcome implies that the current management initiatives by the government are such that they meet the objectives of the new Marine Living Resources Act. That is, the need to achieve optimal utilisation of resources is being adequately implemented....
    Description: Unpublished
    Keywords: Hake fisheries ; Economic analysis
    Repository Name: AquaDocs
    Type: Working Paper , Non-Refereed
    Format: 170547 bytes
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  • 4
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    Government-industry co-management arrangements within the south african deep-sea hake fishery (2005)
    ICLARM
    Details
    Publication Date: 2021-05-19
    Description: As part of a global comparative study of user-participation in fisheries management, a neo-institutional economic framework analysis is applied to the South African Deep-sea Hake Fishery to evaluate past and present co-management arrangements. It is postulated that the comprehensive partnerships that exist will struggle to remain legitimate and functional during major changes in the access-rights regime. The government is redistributing quota to new entrants and previously-disadvantaged South Africans, resulting in competition between the established demersal trawl fleet and a new longline sector for access rights. The established industry is currently undertaking restructuring via investment schemes, joint ventures and share agreements. The relationship between rights to fish a resource and user-participation in management is one where, due to uncertainty, the participants are investing in negotiating security of tenure rather than in co-management arrangements. The current restructuring and institutional changes are thus impacting on the extensive interaction that existed in the past between the industry and the government. Over the last two decades, extensive government-industry commitments to rebuilding has reversed the declining trends in CPUE (tons landed per standard vessel day) observed in the 1960s and 1970s, and the hake stock off the west coast of South Africa is now managed at sustainable levels. The challenge in the future is for the government to engage in co-management arrangements, which replicate the successful agreements of the past with all the stakeholders; that is, both the established industry and the new participants
    Description: Published
    Keywords: Hake fisheries ; Capture fishery economics
    Repository Name: AquaDocs
    Type: Proceedings Paper , Non-Refereed
    Format: 352689 bytes
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  • 5
    Electronic Resource
    Electronic Resource
    The Planning Response to Urban Service Sector Growth: an International Comparison (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Growth and change 22 (1991), S. 0 
    Details
    ISSN: 1468-2257
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Notes: The restructuring of urban economies from manufacturing to service industries has been a major feature of the last twenty-five years. Large cities with a population of at least one million have been at the forefront of this change with the primate cities of the newly industrialized countries increasingly affected. The growth characteristics, planning experiences, and policy implications of the expansion of service industries in large and medium-size metropolitan areas around the world are examined. This has illuminated issues connected with the interurban competition for services. The service sector has shaped new urban planning and public policy agendas and the way in which metropolitan areas in this study have started to reshape their policies provides a good lead for others to follow. It is likely that new pressures will strengthen the need to look beyond their established urban planning policies to broader, integrated urban management policies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-2257.1991.tb00560.x
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  • 6
    Electronic Resource
    Electronic Resource
    “Work Study” (1955)
    [s.l.] : Nature Publishing Group
    Nature 176 (1955), S. 659-659 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Work study may be defined as "the systematic and objective examination of all the factors which directly govern the productive or operational efficiency of any specified activity in order to effect improvement". It is thus founded on scientific analysis and measure-ment in order to determine the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/176659a0
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  • 7
    Electronic Resource
    Electronic Resource
    Linkage analysis in disaccharides by electrospray mass spectrometry
    Amsterdam : Elsevier
    Carbohydrate Research 221 (1991), S. 253-257 
    Details
    ISSN: 0008-6215
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0008-6215(91)80061-Q
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  • 8
    Electronic Resource
    Electronic Resource
    Potential of electrospray mass spectrometry for meat pigment identification
    Amsterdam : Elsevier
    Meat Science 33 (1993), S. 75-83 
    Details
    ISSN: 0309-1740
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0309-1740(93)90095-Y
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  • 9
    Electronic Resource
    Electronic Resource
    X-ray solution scattering studies on vinblastine-induced polymers of microtubule protein: structural characterisation and effects of temperature
    Amsterdam : Elsevier
    Journal of Structural Biology 109 (1992), S. 28-38 
    Details
    ISSN: 1047-8477
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/1047-8477(92)90064-H
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  • 10
    Electronic Resource
    Electronic Resource
    On the formation of porosity during removal of organic vehicle from injection-moulded ceramic bodies (1992)
    Springer
    Journal of materials science 11 (1992), S. 1075-1077 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00729766
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