ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Algebraic structure count of cyclobutadieno-annelated unbranched phenylenes (1994)
    Springer
    Monatshefte für Chemie 125 (1994), S. 539-547 
    Details
    ISSN: 1434-4475
    Keywords: Structure Count ; Phenylene ; Kekulé
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Berechnung des algebraischen Strukturzählers eines unverzweigten cyclobutadieno-annelierten Phenylens wird auf die numerische Ermittlung der Kekulé-Strukturen eines unverzweigten cactakondensierten benzenoiden Systems zurückgeführt. Für letztere stehen einfache und bekannte Algorithmen zur Verfügung.
    Notes: Summary The calculation of the algebraic structure count of a cyclobutadieno-annelated unbranched phenylene is reduced to an enumeration of the Kekulé structures of an unbranched catacondensed benzenoid system. For the latter computation, easy and well-known algorithms exist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811846
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The localized incorporation of 3H-L-fucose into cell-wall polysaccharides of the cap and epidermis of corn roots (1971)
    Springer
    Planta 99 (1971), S. 211-221 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When 3H-L-fucose is provided to corn roots, a large proportion of the radioactivity is recovered in the polysaccharides extracted from the cell wall. Hydrolysis of this material yields 3H-L-fucose as the sole radioactive product. Two metabolites, identified tentatively as L-fucose-1-phosphate and a nucleoside diphosphate derivative of L-fucose have been isolated from the ethanol soluble fractions of the roots and are possibly precursors of the polysaccharide. Autoradiographs of tissue sections indicate that the synthesis of polysaccharides containing L-fucose is confined largely to the root-cap and epidermis. The outer epidermal wall and root-cap slime are particularly radioactive and, therefore, likely to be relatively rich in fucose. By contrast the cell walls from more deeply lying tissues incorporate negligible amounts of the sugar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386839
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Somatic embryogenesis from immature inflorescences of oil palm (1994)
    Springer
    Plant cell reports 13 (1994), S. 247-250 
    Details
    ISSN: 1432-203X
    Keywords: Somatic Embryogenesis ; Oil Palm ; Inflorescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Immature inflorescences of oil palm (Elaeis guineensis) var. Pisifera were inoculated onto modified MS medium containing 0.3% (w/v) activated charcoal and 475 μM 2,4-D. After 2—3 months of culture, a hard yellow callus proliferated at the base of the shoot-like structures. The high incidence of phenolic oxidation required the use of increased levels of activated charcoal (0.5% w/v) and 2,4-D (500 μM). Development of floral structures from inflorescence expiants was frequently observed during the culture period. After 81 weeks of culture, an embryogenic tissue characterized by compact consistency and pearly white color was observed in tissues derived from very young inflorescences. This compact embryogenic tissue differentiated into normal somatic embryos when transferred onto regeneration medium containing NAA (15 μM) and ABA (2 μM). Normal plantlets were recovered from these somatic embryos after 8 weeks on regeneration medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233313
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Cell wall formation in zoospores of Allomyces arbuscula (1974)
    Springer
    Archives of microbiology 98 (1974), S. 147-158 
    Details
    ISSN: 1432-072X
    Keywords: Allomyces ; Zoospores ; Cell Wall ; Wall Formation ; Lomasome ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ultrastructural observations on encysting haploid zoospores of Allomyces arbuscula are presented with special reference to cell wall deposition. Multivesicular bodies are observed in the cytoplasm of zoospores 15 min after inoculation, lomasomes after 30 min and fine membrane profiles between the plasmalemma and the cyst wall are observed after 4 h indicating a possible system for secretion of cell wall components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425277
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Cell wall formation in zoospores of Allomyces arbuscula (1976)
    Springer
    Archives of microbiology 109 (1976), S. 37-43 
    Details
    ISSN: 1432-072X
    Keywords: Allomyces ; Development of meiospores ; Cell wall structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Development of haploid meiospores of Allomyces arbuscula into germling cells with rhizoids and hyphae was followed during incubation in complete growth medium. The surface structure of encysted meiospores, rhizoids and hyphae before and after extraction of amorphous materials with ethanolic KOH was studied by means of carbon-platinum replicas. After 2–3 min incubation in complete medium 10% of the meiospores were surrounded by a cell wall containing microfibrils embedded in a matrix. Structure of cell walls of encysted meiospores, rhizoids, and hyphae differ from one another by the location of amorphous materials and by the arrangement of chitin microfibrils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425110
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Cell wall formation in zoospores of Allomyces arbuscula (1977)
    Springer
    Archives of microbiology 113 (1977), S. 73-78 
    Details
    ISSN: 1432-072X
    Keywords: Allomyces ; Cell wall carbohydrates ; Differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Carbohydrate composition was determined in isolated cell walls of meiospores of Allomyces arbuscula after incubation for 15 min (encysted meiospores: cysts), 150 min (germlings: cysts + rhizoids) and 24 h (cysts + rhizoids + hyphae). The principal constituent in all cell wall samples is chitin, accounting for about 75% of the recovered carbohydrates. In addition, cell walls of all stages examined contain polysaccharides which release galactose, glucose, mannose, arabinose, xylose, fucose, and rhamnose on acid hydrolysis. While different developmental stages show minor quantitative changes in chitin, the ratio of galactose to glucose decreases sharply during differentiation of ungerminated cysts into germlings with rhizoids and hyphae. The increase in glucose is accompanied by a decrease in the amount of xylose and/or fucose and of galactose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428583
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The factorisation of chemical graphs and their polynomials: A systematic study of certain trees (1987)
    Springer
    Journal of mathematical chemistry 1 (1987), S. 175-218 
    Details
    ISSN: 1572-8897
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mathematics
    Notes: Abstract Characteristic polynomials of the set of 284 trees which have 1 – 12 vertices of valency 1 – 3 have been examined for possible factors (divisors) using polynomial division. Twenty of these trees are prime in the sense that they contain no other trees in the set as factors. The remaining 264 trees can all be constructed from a subset of 5 trees and a at of 152 non-graphical polynomials. Some of these polynomials exhibit iso- or sub-spectral relationships with acyclic (matching) polynomials of certain cyclic structures. A few cyclic factors of trees are noted briefly. Twenty pairs and one triad of the trees examined are isospectral.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01205667
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    On the recognition of structural features: Some general problems illustrated by hamiltonian paths in polyhexes (1991)
    Springer
    Journal of mathematical chemistry 8 (1991), S. 77-87 
    Details
    ISSN: 1572-8897
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mathematics
    Notes: Abstract Human and machine recognition skills are discussed, though not comprehensively reviewed, and some of the difficulties are illustrated by algorithms written to search for Hamiltonian paths in polyhexes. The most successful strategy for this is based upon the “branching graph”, a recently introduced graph-theoretical device which can aid the recognition of edges that arenot part of a Hamiltonian path. Another, more widely applicable approach that is interesting, although in this preliminary form only a little better than random methods, uses the metaphor of biological evolution, and tries to “breed” and “grow” paths subjected to “natural selection”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01166925
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    A note on some coefficients of the Chebyshev polynomial form of the characteristic polynomial (1988)
    Springer
    Journal of mathematical chemistry 2 (1988), S. 83-87 
    Details
    ISSN: 1572-8897
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mathematics
    Notes: Abstract The characteristic polynomial of a graph, which traditionally is written down in descending powers ofX can also be expressed in the mathematically equivalent form of a linear combination of the characteristic polynomials of linear chains, and often this expression is a simpler one. Investigation of the first few coefficients reveals that in this form the even ones are of smaller magnitude because they are more closely related to the cyclomatic number of the graph. On the other hand, the early odd coefficients are the same or are more complicated in composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01166470
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Coding and enumeration of trees that can be laid upon a hexagon lattice (1992)
    Springer
    Journal of mathematical chemistry 11 (1992), S. 187-197 
    Details
    ISSN: 1572-8897
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mathematics
    Notes: Abstract A tree that can be superimposed upon a hexagon lattice is called a hexagon lattice tree. A method for mechanically coding, enumerating and drawing these objects is described, and has been tested for trees with up to ten vertices. For storage and information transmission, the code uses an expanded version of theN-tuple code in which edge vector elements having one of four possible values are inserted. For establishing uniqueness, it is used in combination with a hexagon lattice reference grid whose vertices are numbered sequentially in the tightest possible outward spiral. Published rules for the derivation ofN-tuple codes by hand are commented on, and a small error pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01164203
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...