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  • Springer  (12)
  • American Chemical Society  (6)
  • Oxford University Press
  • 1990-1994  (18)
  • 1992  (18)
  • 1
    Electronic Resource
    Electronic Resource
    Silicon-promoted ring contractions in the formation of carbocyclic spiro compounds. Total synthesis of (-)-solavetivone (1992)
    s.l. : American Chemical Society
    The @journal of organic chemistry 57 (1992), S. 922-928 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00029a025
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  • 2
    Electronic Resource
    Electronic Resource
    A novel method for the incorporation of glycoprotein-derived oligosaccharides into neoglycopeptides (1992)
    s.l. : American Chemical Society
    Bioconjugate chemistry 3 (1992), S. 391-396 
    Details
    ISSN: 1520-4812
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bc00017a006
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  • 3
    Electronic Resource
    Electronic Resource
    Antiandrogenic steroidal sulfonyl heterocycles. Utility of electrostatic complementarity in defining bioisosteric sulfonyl heterocycles (1992)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 35 (1992), S. 1663-1670 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00088a001
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  • 4
    Electronic Resource
    Electronic Resource
    Simplicial arrangements associated with the 24-cell (1992)
    Springer
    Journal of geometry 45 (1992), S. 177-200 
    Details
    ISSN: 1420-8997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Let ℓ = A 4 1 (49) be the 4-arrangement in real projective 4-space that includes all 24 facet hyperplanes of the 24-cellT, its 24 hyperplanes of mirror symmetry, and the hyperplane at infinity. In this paper we show that ℝ is theonly simplicial 4-arrangement formed by including some of the hyperplanes of mirror symmetry and possibly the hyperplane at infinity with the 24 facet hyperplanes ofT. Only one other simplicial 4-arrangement is known that does not lie in a natural sequence of arrangements that are simplicial in each dimension. Two of the simplicial 3-arrangements induced by X were not previously in the literature, so 19 joinirreducible simplicial 3-arrangements are currently known.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01225776
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  • 5
    Electronic Resource
    Electronic Resource
    Grünbaum 4-arrangements on the 120-cell and the 600-cell (1992)
    Springer
    Journal of geometry 45 (1992), S. 114-120 
    Details
    ISSN: 1420-8997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In 1971, Branko Grünbaum noted that the projectived-arrangements formed by including with the facet hyperplanes of a regular polytope in Ed some of its hyperplanes of mirror symmetry and possibly the hyperplane at infinity might be expected to be simplicial. In this paper we show that none of the 4-arrangements so associated with either the 120-cell or the 600-cell inE 4 is simplicial.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01225770
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  • 6
    Electronic Resource
    Electronic Resource
    Studies of pollen maturation in cotton: the storage reserve accumulation phase (1992)
    Springer
    Sexual plant reproduction 5 (1992), S. 117-127 
    Details
    ISSN: 1432-2145
    Keywords: Pollen maturation ; Gossypium hirsutum L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This study follows the maturation of the pollen grain of cotton (Gossypium hirsutum L.), particularly the development of the vegetative cytoplasm and the various storage products formed. CTEM, HVEM, stereoscopy, and cyto-histochemistry were used to examine the events occurring during the 9 days before anthesis. Starch began to accumulate in plastids at anthesis minus 9 days and reached a peak concentration shortly before anthesis; lipid deposition followed a similar pattern, but started at 6 days before anthesis. Lipid bodies were always seen closely oppressed to the endoplasmic reticulum (ER). Dictyosomes appear active during the entire 9 days; first producing vesicles involved in the formation of the intine and, later, producing vesicles stored in the pollen grain. The dictyosome vesicles appear to contain polysaccharides and concentrate in layers around the lipid bodies. Ribosomes increase in number from 6 days before anthesis and are particularly numerous in the mature pollen. From anthesis minus 6 days until anthesis, the ER cisternae become increasingly inflated and, in the hours immediately before pollen release, form pockets filled with lipid bodies and dictysosome vesicles. The mature pollen has a core region filled with ER pockets and a peripheral cytoplasm in which such pockets are generally lacking.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194870
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  • 7
    Electronic Resource
    Electronic Resource
    Diversity in steroidogenesis of symbiotic microorganisms from planthoppers (1992)
    Springer
    Journal of chemical ecology 18 (1992), S. 2083-2094 
    Details
    ISSN: 1573-1561
    Keywords: Ergosta-5,7,24(28)-trien-3β-ol ; trienol ; intracellular symbiotes ; steroidogenesis ; planthoppers ; Nilaparvata lugens ; Laodelphax striatellus ; Homoptera ; Fulgoridae ; steroid-deficient diet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Ergosta-5,7,24(28)-trien-3β-ol (trienol)6 was isolated from the intracellular symbiotes (symbiotic microorganisms) of the planthoppers,Nilaparvata lugens andLaodelphax striatellus. The steroidogenic end product of the symbiotes was found to depend on the environmental conditions, i.e., although trienol6 was produced under symbiotic conditions, ergosterol4 was formed in aerobic culture. When the normal diet was replaced by a steroiddeficient artificial one, the ratio of 24-methylenecholesterol5 to total insect sterols was significantly increased. The above study offers further corroborating evidence for our assumption that the host insects require 24-methylenecholesterol5 as an alternate source for cholesterol1 under certain environmental conditions. In our previous biotransformation experiments, 24methylenecholesterol5 was shown to be an immediate precursor of cholesterol1. However, the complexity of the insects' vital functions hindered all subsequent attempted transformations into cholesterol1 of sitosterol2, trienol6, and ergosterol4, under injection conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00981929
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  • 8
    Electronic Resource
    Electronic Resource
    Concluding remarks I. Limnology now and in the future (1992)
    Springer
    Hydrobiologia 243-244 (1992), S. 481-485 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007066
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  • 9
    Electronic Resource
    Electronic Resource
    Clean water: a fading resource (1992)
    Springer
    Hydrobiologia 243-244 (1992), S. 21-30 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fresh waters of the world are collectively experiencing markedly accelerating rates of qualitative and quantitative degradation. The primary types of degradation are reviewed in a historical manner to illustrate the technological and social responses, and the rates at which they can be applied, under different societal structures. Effective utilization of extant freshwater resources is complicated by distributions of humans and their exploitation in regions low in water availability, and by accelerating changes in hydrological patterns associated with on-going and impending climatic changes. Certain societies can cope with pollution and availability constraints, and even reduce freshwater degradation. In most of the world, however, human population growth continues to accelerate without any significant reduction of rates. Until human growth is stabilized, either by intelligence or catastrophes, further losses and degradation of fresh waters can be controlled only partially on a global basis. Control and reversal of degradation requires a proper economic valuation of fresh waters. With proper valuation, methods for effective utilization of existing supplies can be applied to agricultural, industrial, and residential uses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007017
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  • 10
    Electronic Resource
    Electronic Resource
    Gradient-dominated ecosystems: sources and regulatory functions of dissolved organic matter in freshwater ecosystems (1992)
    Springer
    Hydrobiologia 229 (1992), S. 181-198 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The emergent wetland and littoral components of the land-water zone are functionally coupled by the amounts and types of dissolved organic matter that are released, processed, transported to, and then further processed within the recipient waters. Operational couplings and integrations in freshwater ecosystems occur along physical and metabolic gradients of a number of scales from micrometer to kilometer dimensions. The operation and turnover of the microbial communities, largely associated with surfaces, generate the metabolic foundations for material fluxes along larger-scale gradients. Because of the predominance of small, shallow freshwater bodies, most dissolved organic carbon (DOC) of lacustrine and riverine ecosystems is derived from photosynthesis of higher plants and microflora associated with detritus, including sediments, and is only augmented by photosynthesis of phytoplankton. As the dissolved organic compounds generated in the wetland and littoral interface regions move toward the open-water regions of the ecosystems, partial utilization effects a selective increase in organic recalcitrance. Even though DOC from allochthonous and from interface sources is more recalcitrant than that produced by planktonic microflora, decomposition of the much larger interface quantities imported to the pelagic zone dominates ecosystem decomposition. The observed high sustained productivity of the land-water interface zone results from extensive recycling of essential resources (nutrients, inorganic carbon) and conservation mechanisms. On the average in lakes and streams, greater than 90 percent of the decomposition in the ecosystem is by bacteria utilizing DOM from non-pelagic sources of primary productivity. In addition to direct mineralization of DOC from non-pelagic sources, many of the organic compounds function indirectly to influence metabolism. New evidence is presented to demonstrate formation of complexes between humic and fulvic organic acids and extracellular enzymes. These complexes inhibit enzyme activity and can be transported within the ecosystem. The complex can be decoupled by mild ultraviolet photolysis with regeneration of enzyme activity in displaced locations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007000
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