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  • 1
    ISSN: 1615-6102
    Keywords: Funaria protonemata ; Polar cell wall formation ; Membrane rosettes ; Freeze fracturing ; Growth inhibition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In youngFunaria protonemata the influence of various inhibitors and treatments on cell elongation, fine-structure, and particle rosettes within the plasma membrane, putative parts of cellulose synthase complexes, was investigated. Cycloheximide (3×10−5M) inhibited growth, reduced the number of rosettes and evened the gradient of rosette distribution at the beginning of treatment. The cell fine-structure was unaffected. Actinomycin D (10−5M and 10−4) caused an initial but transient decrease in rosette number. Alterations in cell elongation and fine-structure have not been observed. Application of 2.6-dichlorobenzonitrile (10−5 M) for some minutes reduced the number of rosettes remarkably, while cell elongation seemed to be normal after the filaments had been transferred back to normal medium. An incubation of 2 h or longer stopped growth and caused cells to burst. The number of rosettes then rose to about 50% of the control values. When applied for 7 h biofluor (5×10−4 M) promoted growth slightly, but generally it retarded it when used for a longer time. It did not markedly affect the number of rosettes. A short heat stock stopped elongation, caused the disappearance of rosettes and affected the structure of the mitochondria and of the Golgi apparatus. Plasmolysed cells did not grow and, initially, did not have rosettes. At reduced turgor, wider cells are formed. Freeze fracturing under UHV conditions and shadowing at very low specimen temperature revealed a small, central depression in the 8 nm rosette particles, suggesting that they are composed of subunits. Our results provide further evidence that the rosettes are parts of the cellulose synthase complexes. Their existence clearly depends on protein synthesis and on the constitution of the plasma membrane, but not on cellulose crystallization.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Derivatives of o-Phenylene Phosphate. 34. Halogenation of o-Methoxyphenyl Phosphinites, Phosphonites, and Phosphiteso-Methoxyphenyl phosphinites, phosphonites, and phosphites react with halogenes to halogenophosphonium-halides 4, which are stabilized by ligand exchange with the starting material to phosphonium salts or by elimination of methylhalide to cyclic phosphoranes.
    Notes: o-Methoxyphenyl-phosphinite, -phosphonite und -phosphite reagieren mit Halogenen zu Halogenphosphoniumhalogeniden 4, die sich entweder durch Ligandenaustausch mit dem Startprodukt als Phosphoniumsalze oder durch Abspaltung von Methylhalogenid als cyclische Phosphorane stabilisieren.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Structure of “;Trichloro-diphenoxyphosphorane”The structure of ‘Trichloro-diphenoxyphosphorane’ synthesized by well-known and new methods is not a pentacoordinated phosphorus compound, but has the structure of tetraphen-oxyphosphonium hexachlorophosphate 4.
    Additional Material: 1 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Order 4 (1987), S. 233-256 
    ISSN: 1572-9273
    Keywords: 06A15 ; 06C05 ; 06C99 ; 11E04 ; 11E99 ; 15A63 ; Orthogonal geometry ; computation of lattices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Hermitean vector spaces E of infinite dimensions are considered. Let G be a subgroup of the orthogonal group of E acting on a set M. The ‘Lattice Method’ is a technique for classifying the orbits in M under G. We discuss the method in abstract terms and we illustrate it by means of three classification results showing that it is decisive to do a considerable amount of explicit calculations with vector subspace lattices.
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  • 5
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 54 (1985), S. 531-564 
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α-Substituted Phosphonates. 47. Splitting of P—C-Bonds from Trisphosphoryl CompoundsHexaethyldimethylaminomethyl-trisphosphonate (2a) reacts with HCl or trimethylsilylbromid/water by splitting off one phosphoryl group, giving dimethylaminomethyl-bisphosphonic acid (7). The result of methylation of 2a depends on the reagent: with methyliodide one phosphoryl group is split off, and the ammonium salt 11a is formed, while with methyl toluene sulfonate or dimethylsulfate the expected quarternary ammonium salts 10b or 10c are formed. One phosphoryl group of 10c is split off under acidic as well as alkalinous conditions: acidic hydrolysis gives the bisphosphonic acid 15, while under alkalinous conditions the known ylid 16 is formed.
    Type of Medium: Electronic Resource
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