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  • Springer  (1,641)
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  • 1
    ISSN: 1432-1939
    Keywords: Bell Miner ; Honeyeaters ; Asymmetrical competition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The Bell Miner (Manorina melanophrys, Meliphagidae) is a medium-sized, colonial and co-operatively breeding honeyeater. Recent works show that the Bell Miner presents clear patterns of interspecific competition involving aggressive behaviour against many honeyeaters (Meliphagidae) and other bird species (Loyn et al. 1983; Clarke 1984). Nevertheless, those works have been based on short-term (1 year or less) studies only, and none of them have studied the effect territorial defence has on Bell Miners' fitness. We show how the population of honeyeaters decreased over 7 years at the Sir Colin Mackenzie Zoological Park (Southeastern Victoria, Australia). The decrease of honeyeaters in the study site was correlated with a local increase in the Bell Miner population which has been expanding since at least 1983. This process presumably led to the spatial zonation of Bell Miners and honeyeaters observed at present, while other passerine species show no sensitivity to either the invasion of Bell Miners in the recent past or to the present spatial distribution of the Bell Miner population. Finally, we show that Bell Miner reproductive activity is not affected by their interaction with competitors, which leads us to conclude that the interaction between the Bell Miner and other honeyeaters would be better described as asymmetrical competition.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1990-12-01
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
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  • 3
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Various murine tumor lines were screened by FACS analysis for the surface antigens ThB and Ly-6.2. Positive cell lines were used for immunoprecipitation studies. A monoclonal ThB-specific antibody immunoprecipitated a unique acidic protein of approximately 16 000 daltons from several positive tumors and from concanavalin A (Con-A) and LPS activated splenic lymphocytes. Monoclonal Ly-6.2-specific antibody was used to immunoprecipitate a 33 500 dalton protein that was shown to exist in four similarly sized forms with different basic charges. In the course of these studies, the apparent molecular weight of the surface antigen T 30, immunoprecipitated with a monoclonal T 30-specific antibody from the cell line EL4, was found to be approximately 25 000 daltons.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0983
    Keywords: Methylation ; DNA ; Penicillium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Using high performance liquid chromatography, the presence of N6-methyladenine has been found at a level of 0.1 mol percent in DNA extracted from Penicillium chysogenum. No 5-methylcytosine was detected. A mutant strain HP547, which is sensitive to the lethal effects of N-methyl-N1-nitro-N-nitrosoguanidine, methylmethane sulphonate and the base analogue 2-aminopurine shows an increased spontaneous mutation rate and no detectable DNA methylation. Comparison of restriction enzyme digests of wild type and undermethylated strains indicated that methylation was occurring at a different sequence to that of the Dam methylase system of E. coli.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 18 (1994), S. 351-369 
    ISSN: 1432-1009
    Keywords: Marsh management ; Fish ; Crustaceans ; Impoundments ; Estuaries ; Water-control structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Structural marsh management, using levees and water-control structures, is used in the coastal zone for many objectives, for example, to reduce marsh loss, to enhance waterfowl habitat, to revegetate open-water areas, and to reduce saltwater intrusion. The literature was evaluated to categorize structural marsh management and to determine some of its effects on fishes and crustaceans. Structural marsh management had positive effects on standing stock of most resident organisms and negative effects on marine-transient organisms. Emigration was negatively affected for both resident and marine-transient organisms. Techniques such as opening structures at critical migration times, designing structures that offer the greatest management flexibility, and using structures to create a flow-through system could reduce these impacts. More effort should be put into monitoring managed areas to determine if the objectives are being met and to evaluate the effects on fishes and crustaceans. Although frequent manipulation could reduce these impacts, the costs and problems incurred may outweigh the anticipated benefits.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Public choice 105 (2000), S. 1-21 
    ISSN: 1573-7101
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract We test implications of politicalcompetition theory concerning government size, usingdata from U.S. states. We find that greaterpolitical competition in the race for governor actsas a check against bigger government. Evidence onthe effectiveness of legal limits on expendituresand/or revenues growth is mixed. The DemocraticParty is associated with bigger government, but onlywhen party representation in both the governor'shouse and the legislature is strong. The flypapereffect of grants is found to be strong. Our resultshave implications for models of fiscal illusion.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Plant molecular biology 18 (1992), S. 945-961 
    ISSN: 1573-5028
    Keywords: (G+C) content ; aleurone ; cereal transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We developed a system using ‘passive’ reporter genes driven by aleurone tissue-specific promoters to test the effect of methylation of foreign DNA on its stability after introduction into barley plants. The foreign DNA was introduced into barley cells and was able to persist through at least two plant generations. Transformation of barley cells was defined by showing initiation of transcription at the proper site on the barley promoter for the chimeric gene in aleurone tissue from both a primary transformant and its progeny, and by tissue-specific expression (aleurone 〉 leaf) in the progeny. This persistence through many multiples of cell division is formally equivalent to transformation, regardless of whether the DNA was chromosomally integrated or carried as an episome, but did not necessarily represent stable integration into the genome since the foreign DNA was frequently rearranged or lost. The foreign DNA was most stable when plasmid DNA used in transformation lacked dA methylation but had complete methylation of dC residues in the CG dinucleotide at Hpa II sites; dA methylation alone was associated with marked foreign DNA instability. Our results are consistent with the presence of a previously undefined system in barley that identifies DNA lacking the proper methylation pattern and causes its loss from actively dividing cells. These results may be important when applied to different strategies using selectable markers for cereal transformation.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Plant molecular biology 17 (1991), S. 509-512 
    ISSN: 1573-5028
    Keywords: protease ; genome evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A genomic clone fromHordeum vulgare L. cv. Himalaya contains 700 bp of DNA that is homologous with a high degree of nucleotide sequence similarity to exon 3-intron 3 from the gene for the thiol protease, aleurain. Genomic Southern blot mapping data indicate that this clone in phage λ had not undergone rearrangement, and no other sequences homologous to aleurain are present on it. Although exon 3 in aleurain encodes the polypeptide region cleaved during proteolytic processing of the proenzyme to its mature form, we do not know if the copy is expressed in some other protein. We have mapped the aleurain gene to chromosome 1, and this copy of exon 3-intron 3 to chromosome 2.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Mycopathologia 125 (1994), S. 41-42 
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1572-9001
    Keywords: Cesium ; 2-benzylphenol ; Pi-cation interaction ; extraction ; molecular mechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Extraction experiments show that 2-benzylphenol is an efficient and selective extractant for cesium. The structures of cesium and potassium 2-benzylphenolate were determined. Both structures also contain 2-benzylphenol, which ligates the cation, through its phenolic oxygen atom and the benzyl ring. The phenolate oxygen atom does not directly contact the cation in either structure, but is a hydrogen-bond acceptor to the 2-benzylphenol ligands, forming a supramolecular assembly. For comparison to the bound ligands, the structure of 2-benzylphenol was also determined. Molecular mechanics and ab initio molecular orbital theory are used to rationalize several aspects of Cs/Na selectivity.
    Type of Medium: Electronic Resource
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