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  • 1
    Electronic Resource
    Electronic Resource
    A Bacillus subtilis dipeptide transport system expressed early during sporulation (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 5 (1991), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Two previously identified Bacillus subtilis DNA segments, dciA and dciB, whose transcripts accumulate very rapidly after induction of sporulation, were found in the same 6.2 kb transcription unit, now known as the dciA operon. Analysis of the sequence of the dciA operon showed that its putative products are homologous to bacterial peptide transport systems. The product of the fifth gene, DciAE, is similar to peptide-binding proteins from Escherichia coli and Salmonella typhimurium (DppA and OppA) and B. subtilis (OppA). A null mutation in dciAE abolished the ability of a proline auxotroph to grow in a medium containing the dipeptide Pro–Gly as sole proline source, suggesting that the dciA operon encodes a dipeptide transport system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1991.tb00814.x
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  • 2
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    Antigone and Creon (1926)
    St. Louis : Periodicals Archive Online (PAO)
    The Classical Bulletin. 3 (1926:Oct.-1927:Aug.) 56 
    Details
    ISSN: 0009-8337
    Topics: Classical Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:3079-1926-003-00-000007
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  • 3
    Electronic Resource
    Electronic Resource
    Phenotypic response to selection for traits with direct and maternal components when generations overlap (1985)
    Springer
    Theoretical and applied genetics 70 (1985), S. 123-127 
    Details
    ISSN: 1432-2242
    Keywords: Selection ; Maternal effects ; Overlapping generations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Prediction of response to selection for traits with direct and maternal components is described for discrete and overlapping generations. Expected phenotypic response is the sum of direct and maternal contributions, the latter having a genetic and an environmental component. With overlapping generations the selection differentials achieved on these components are added to respective updated vectors containing age-sex distributions with values of previous selection rounds. An example demonstrates that in the early stages, results may be considerably affected by environmental correlations between direct and maternal effects. The method could be helpful in interpreting phenotypic changes in a population selected for traits with maternal effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275310
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  • 4
    Electronic Resource
    Electronic Resource
    Protein secretion in phosphate-limited cultures of Bacillus subtilis 168 (1998)
    Springer
    Applied microbiology and biotechnology 49 (1998), S. 321-327 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The secretion of proteins from Bacillus subtilis was studied under physiologically well-defined conditions in continuous cultures at a range of specific growth rates. The kinetics of secretion was analysed by using pulse-chase and immunoprecipitation techniques that allowed both processing and release to be monitored. Growth conditions were selected that were known to lead to significant changes in the anionic polymer composition of the cell wall. Under magnesium limitation only low levels of native proteins were released into the growth medium. In contrast, much higher amounts of released protein were observed under phosphate limitation. Although synthesis of native secretory proteins appeared to be highly regulated, only minor changes in the secretion of heterologous proteins were detected. Comparable kinetics of protein release of cells grown under different conditions indicated similar cell wall permeabilities. The large changes in the amounts of released proteins were not reflected in the production of chaperones and components required for protein secretion. The data suggest that the capacity of the secretion machinery is not a major limiting step in the export of native secretory proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051176
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  • 5
    Electronic Resource
    Electronic Resource
    Effect on linkage disequilibrium of selection for a quantitative character with epistasis (1983)
    Springer
    Theoretical and applied genetics 65 (1983), S. 25-30 
    Details
    ISSN: 1432-2242
    Keywords: Linkage disequilibrium ; Selection ; Genetic variance ; Quantitative traits ; Epistasis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Selection for a character controlled by additive genes induces linkage disequilibrium which reduces the additive genetic variance usable for further selective gains. Additive x additive epistasis contributes to selection response through development of linkage disequilibrium between interacting loci. To investigate the relative importance of the two effects of linkage disequilibrium, formulae are presented and results are reported of simulations using models involving additive, additive x additive and dominance components. The results suggest that so long as epistatic effects are not large relative to additive effects, and the proportion of pairs of loci which show epistasis is not very high, the predominant effect of linkage disequilibrium will be to reduce the rate of selection response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276258
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  • 6
    Electronic Resource
    Electronic Resource
    Use of goats as biological agents for the renovation of pastures in the Appalachian region of the United States (1998)
    Springer
    Agroforestry systems 44 (1998), S. 241-252 
    Details
    ISSN: 1572-9680
    Keywords: browse ; cattle ; defoliation ; pasture reclamation〉/kwd〉 ; Rosa multiflora
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Much of hill-land pasture in the Appalachian region of the United States is dominated by herbaceous weeds and brush. Low cost, low input and environmentally acceptable reclamation procedures are needed to maintain the productivity of these pastures. This experiment evaluated the effectiveness of using goats (Capra hircus hircus) alone (30 mature, brush does/ha) or cattle (Bos taurus) with goats (17 mature, brush does/ha + two to three steers/ha -- 225 kg average live weight) to reclaim a pasture from an abandoned, overgrown 5.9 ha orchard left untouched for 15 years. Over four grazing seasons, managed defoliation resulted in a substantial increase in herbaceous vegetative cover in plots grazed by goats alone (65 to 86%) and by goats with cattle (65 to 80%) while vegetative cover decreased from 70 to 22% in the control plot. Similarly, the cover by grass species increased in the grazed plots (goats: 16 to 63%; goats + cattle: 13 to 54%) while averaging 10% in the control plot. Multiflora rose (Rosa multiflora Thumb.) bushes were practically eliminated after four grazing seasons as quantified by an average reduction in height from 2.1 m to 0.6 m, and by the number of dead canes (stems) in both the goat (100%) or goat + cattle (92%) treatments. Results indicated that the foraging habits of goats resulted in the elimination of multiflora rose bushes and in a significant increase in desirable forage species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006250728166
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  • 7
    Electronic Resource
    Electronic Resource
    The establishment and early growth of three leguminous tree species for use in silvopastoral systems of the southeastern USA (1998)
    Springer
    Agroforestry systems 44 (1998), S. 253-265 
    Details
    ISSN: 1572-9680
    Keywords: Albizia julibrissin ; browse ; forage ; Gleditsia triacanthos ; goats ; Robinia pseudo-acacia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Demand for goat meat in the eastern USA is growing as a result of preference by ethnic communities. Meat goat production systems in the southeastern USA should be designed to take advantage of the goats' natural preference for browse. Trees could contribute to system productivity by supplying required nutrients when demand by growing animals is critical and the quality of forage is limited. A field study was established in Wake County, NC to evaluate the establishment and early growth characteristics of three leguminous tree species, Robinia pseudoacacia, Gleditsia triacanthos, and Albizia julibrissin. The three tree species were planted in single-row plots following a randomized complete block design (3 × 2 × 2, replicated six times) with two planting densities (intra-row spacing of 50 or 100 cm) and two coppice heights (25 or 50 cm). Bare-root seedlings were planted in March 1995, evaluated for browse quality (composited samples) in August 1995, coppiced in February 1996, evaluated for herbage mass and quality in July 1996, and evaluated for goat preference in August 1996. Herbage mass produced during the second season ranged from about 200 (G. tricanthos) to 3,200 kg/ha (R. pseudoacacia). Estimates of herbage quality were high for all species. Crude protein and acid detergent fiber of leaflets ranged from 23 to 28% and 12 to 22%, respectively. Robinia pseudoacacia has a high potential as a browse species for goats due to high herbage production (mean of 2,390 kg/ha) and goat preference. Gleditsia triacanthos was judged to be a low value browse species. Albizia julibrissin, although not highly preferred by goats in the trial holds sufficient potential to warrant further investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006254812236
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  • 8
    Electronic Resource
    Electronic Resource
    Modeling the transportation domain (1995)
    Springer
    Computational economics 8 (1995), S. 81-93 
    Details
    ISSN: 1572-9974
    Keywords: Multi-agent systems ; (distributed) planning ; communication ; resource scheduling ; logistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Economics
    Notes: Abstract The transportation domain is presented as a multi-agent scenario and the use of techniques of Distributed Artificial Intelligence (DAI) for solving cooperatively the hard problems that occur in this domain are demonstrated. After a motivation and a description of the domain we will address questions of cooperation between the agents, techniques for task decomposition and task allocation, and multi-agent planning and scheduling. By introducing a cooperation protocol, examples will be presented that show the utility of the approach. Finally, some implementation aspects will be considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01299711
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  • 9
    Electronic Resource
    Electronic Resource
    Patterning polymer metal precursor for high temperature superconductor films (1997)
    Springer
    Journal of materials science 16 (1997), S. 16-18 
    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/10.1023/A:1018524111864
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