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  • 1
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    Concept studies for a laser powered orbital transfer vehicle (1989)
    Elsevier
    Details
    Publication Date: 1989-01-01
    Print ISSN: 0094-5765
    Electronic ISSN: 1879-2030
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 2
    Electronic Resource
    Electronic Resource
    Complexation with diol host compounds. Part 2. Structures of 1,1,2,2-tetraphenylethane-1,2-diol and its 1∶2 molecular inclusion complex with dimethylsulphoxide (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 809-822 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structures of 1,1,2,2-tetraphenylethane-1,2-diol and its 1∶2 molecular inclusion complex with dmso have been elucidated by X-ray crystallography from single crystal diffraction data. Crystals of the host, compound I, are monoclinic, space groupP21/n, witha=17.669(6) Å,b=6.144(6) Å,c=17.873(6) Å,β=92.67(3)°,z=4. Crystals of the clathrate, compound II, are triclinic,P¯1, witha=9.138(5) Å,b=18.384(6) Å,c=18.496(3) Å,α=61.16(2)°,β=83.22(3)°, γ=88.06(3)°,Z=4. Both structures were solved by direct methods and refined to finalR values of 0.072 and 0.107, respectively. Compound I is partially disordered and its packing is governed by strong intermolecular hydrogen bonds. Compound II is characterized by crossing channels which accommodate the guest dmso molecules. The thermal properties of the latter compound have been characterized by DTA and TGA thermograms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185348
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  • 3
    Electronic Resource
    Electronic Resource
    Complexation with diol host compounds. Part 3. Molecular inclusion of 4-methylcyclohexanone and 2-methylcyclohexanone by the host,trans-9,10-dihydroxy-9,10-diphenyl-9,10-dihydroanthracene (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 847-859 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structures of the 1∶2 molecular complexes oftrans-9,10-dihydroxy-9,10-diphenyl-9,10-dihydroanthracene with 4-methylcyclohexanone (1) and with 2-methylcyclohexanone (2) have been determined by X-ray crystallography. The crystal data are as follows: Compound (1):P22/c,a=8.838(2) Å,b=8.92(1) Å,c=20.879(8)=Å,β=98.67(2)°,V=1627(2) Å3,Z=2 andR=0.062 for 2201 unique MoKα reflections; Compound (2):P¯1,a=8.917(3) Å,b=9.900(2) Å,c=11.250(4) Å,a=68.72(2)°,β=64.39(3)°, γ=74.86(2)°,V=828.1(5) Å3,Z=1 andR=0.098 for 2563 unique reflections. Both inclusion compounds exhibit O-H⋯O=C hydrogen bonding interactions. The thermal properties of these compounds have been characterized by DTA and TGA thermograms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185351
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  • 4
    Electronic Resource
    Electronic Resource
    Sustained hysteresis in a catalysed reaction: Hydrogenolysis of alkanes on Re/Al2O3 catalysts (1989)
    Springer
    Catalysis letters 2 (1989), S. 257-261 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Alkane hydrogenolysis on Re/Al2O3 catalysts has been studied by a thermal cycling procedure. Because deactivation occurs during heating and is then reversed at higher temperatures, rates are much faster during cooling than during heating. Rates during subsequent thermal cycles are reproducible. Re is 104 times more active than Pt for hydrogenolysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770222
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of carbonaceous deposits on product selectivity in alkane hydrogenolysis (1989)
    Springer
    Catalysis letters 3 (1989), S. 359-363 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The hydrogenolysis of propane and of n-butane on Pt/Al2O3 and Pt-Re/Al2O3 catalysts has been studied using a stepwise temperature programme which reveals clearly the effects of carbonaceous deposits on both rate and product selectivities. On Pt/Al2O3 catalysts, deposits formed during the reaction of n-butane suppress C2H6 formation and enhance C3H8 formation, due solely to a decrease in the probability of central C-C bond fission. On Pt-Re/Al2O3, such deposits have little or no effect on product selectivities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00771263
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  • 6
    Electronic Resource
    Electronic Resource
    Leaf size and inflorescence size may be allometrically related traits (1989)
    Springer
    Oecologia 78 (1989), S. 427-429 
    Details
    ISSN: 1432-1939
    Keywords: Allometry ; Leaf size ; Inflorescence size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary “Corner's rules” for plant form relate the degree of branching to branch diameter, and branch diameter to leaf or inflorescence size. We report the first interspecific test of these rules for inflorescence size and branch diameter. We derived a simple corollary of Corner's rules; since leaf size and inflorescence size are both correlated to branch thickness, they may be correlated to each other. This corollary holds for Leucadendron and Protea (Proteaceae), and in certain other taxa in the Asteraceae, Bruniaceae and Pinaceae which also have leaves and reproductive structures on the same shoot. For such taxa this implies that selection for aspects of floral display (inflorescence size, pollination type) may also be expressed at the level of leaf size and vice versa. This has implications for many aspects of botany and also points to the importance of the co-ordinating role of plant architecture for aspects of plant form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379120
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  • 7
    Electronic Resource
    Electronic Resource
    The costs of leaving home: ants disperse myrmecochorous seeds to low nutrient sites (1989)
    Springer
    Oecologia 81 (1989), S. 412-417 
    Details
    ISSN: 1432-1939
    Keywords: Myrmecochory ; Fynbos ; Regeneration ; Fire ; Nutrient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Leucospermum conocarpodendron (L.) Buek (Proteaceae) seedlings were excavated several months after a fire in Cape fynbos. Seedlings under burnt parental skeletons had short hypocotyls (mean 25 mm) indicating passive dispersal whereas seedlings in the open were more deeply buried (mean 48 mm) by ants. Soil nutrient concentrations at the site of germination were negatively related to depth of burial and distance from parent. Ant dispersal resulted in seedlings emerging in soils with lower nutrient concentrations than passively dispersed seeds. Tissue analysis supported the soil results with lower P content in seedlings from open (ant dispersed) sites. Seedling survival in the first year of establishment was also lower in open sites, but not significantly so. However seedlings were slightly taller in the open. The results of this study, the first on naturally occurring intraspecific variation in myrmecochory, strongly contradict current explanations for the high incidence of myrmecochory in nutrient poor environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377092
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  • 8
    Electronic Resource
    Electronic Resource
    Sensitivity of crop yields and land resource potential to climatic change in Ontario, Canada (1989)
    Springer
    Climatic change 14 (1989), S. 153-174 
    Details
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Increasing concentrations of atmospheric CO2 and other greenhouse gases are expected to contribute to a global warming. This paper examines the potential implications of a climatic change corresponding to a doubling of atmospheric concentrations of CO2 on crop production opportunities throughout Ontario, a major food producing region in Canada. The climate is projected to become warmer and drier, but the extent of these shifts are expected to vary from region to region within Ontario. The effect of this altered climate on crop yields and the area of land capable of supporting specific crops varies according to region, soil quality and crop type. Most notable are the enhanced opportunities for grains and oilseeds in the northern regions, and the diminished production prospects for most crops in the most southerly parts of Ontario.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00142725
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  • 9
    Electronic Resource
    Electronic Resource
    Novel cis-acting elements in petunia Cab gene promoters (1989)
    Springer
    Molecular genetics and genomics 215 (1989), S. 337-344 
    Details
    ISSN: 1617-4623
    Keywords: Divergent promoters ; Chlorophyll a/b binding protein genes ; cis-acting elements ; RNA expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In order to identify specific cis-acting elements which regulate the expression of the divergent Cab22R and Cab22L genes of Petunia, we conducted systematic mutational studies of the 1 kb intergenic promoter region. Sequence analysis revealed three GATA box sequence repeats positioned between the TATA and CAAT box elements. These GATA elements are conserved in corresponding promoter regions of all LHCII Type I Cab genes in Petunia and other dicotyledonous plants we have examined. Sitespecific mutations in the CAAT box and the GATA box elements of the Cab22R promoter resulted in 8-fold and 5-fold reductions in Cab22R transcript levels respectively. A deletion of 52 bp, adjacent and upstream from the CAAT box (-92 to- 145) in the Cab22R promoter reduced transcript levels 20-fold. This deletion contains a region of 13 pb which is conserved between many Petunia Cab genes. These results indicate that the quantitative expression of the Cab22 promoters is regulated by multiple cis-acting elements including CAAT and GATA box elements as well as sequences located between -92 and -145. The deletion of the region between -92 and -145 is partially compensted by homologous sequences present in the adjacent divergent promoter Cab22L.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00339739
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  • 10
    Electronic Resource
    Electronic Resource
    A · T → C · G transversions and their prevention by the Escherichia coli mutT and mutHLS pathways (1989)
    Springer
    Molecular genetics and genomics 219 (1989), S. 256-262 
    Details
    ISSN: 1617-4623
    Keywords: mutT mutator ; A · T → C · G transversions ; A · G mispairs ; Mismatch correction ; trpA system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Escherichia coli mutT strains are strong mutators yielding only A · T → C · G transversion mutations. These are thought to result from uncorrected (or unprevented) A · G mispairings during DNA replication. We have investigated the interaction of mutT-induced replication errors with the mutHLS-encoded postreplicative mismatch repair system. By measuring mutation frequencies in both forward and reversion systems, we have demonstrated that mutTmutL and mutTmutS double mutators produce no more mutants than expected from simple additivity of the frequencies in the single mutators. We conclude that mutT-induced A · G replication errors are not recognized by the MutHLS system. On the other hand, direct measurements of mismatch repair by transfection of bacteriophage M13mp2 heteroduplex DNA as well as mutational data from strains other than mutT indicate that the MutHLS system can repair at least certain A · G mispairs. We suggest that A · G mispairs may exist in several different conformations, some of which are recognized by the MutHLS system. However, the A · G mispairs normally prevented by the mutT function are refractory to mismatch repair, indicating that they may represent a structurally distinct class.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261185
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