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  • 1990-1994  (3)
  • 1970-1974  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Synthesis of polymers with amino end groups. 3. Reactions of anionic living polymers with α-halo-ι-aminoalkanes with a protected amino functionality (1990)
    s.l. : American Chemical Society
    Macromolecules 23 (1990), S. 939-945 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00206a006
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  • 2
    Digitale Medien
    Digitale Medien
    The basic proteins of male gametic nuclei isolated from pollen grains of Lilium longiflorum (1994)
    Springer
    Planta 192 (1994), S. 446-452 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Chromatin ; Generative nucleus ; Histone ; Lilium ; Nuclear differentiation ; Pollen
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A method has been developed for the efficient isolation of “generative” and “vegetative” nuclei from the generative and vegetative cells, respectively, of pollen grains of Lilium longiflorum Thunb. First, large numbers of pollen protoplasts were isolated enzymatically from nearly mature pollen grains. After the protoplasts had been gently disrupted by a mechanical method, the generative cells could be separated from the other pollen contents, which included vegetative nuclei. The generative nuclei were isolated by suspending the purified generative cells in a buffer that contained a non-ionic deter gent. The isolated generative nuclei, like those within pollen grains, had highly condensed chromatin and the isolated material was without contamination by vegetative nuclei. When basic proteins, extracted from the preparation of generative nuclei by treatment with 0.4 N H2SO4, were compared with those from preparations of somatic and vegetative nuclei by two-dimensional gel electrophoresis, it was revealed that at least five proteins with apparent molecular masses of 35, 33, 22.5, 21 and 18.5 kDa (p35, p33, p22.5, p21 and p18.5), respectively, were specific for, or highly concentrated in, the generative nuclei. An examination of solubility in 5% perchloric acid and the mobility during electrophoresis indicated that two of these proteins (p35 and p33) resembled H1 histones while the three other proteins (p22.5, p21 and p18.5) resembled core histones. It is likely that these basic nuclear proteins are related to the condensation of chromatin or to the differentiation of male gametes in flowering plants, as is the case for analogous proteins present during spermatogenesis in animals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00198582
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  • 3
    Digitale Medien
    Digitale Medien
    Identification of an A-factor-dependent promoter in the streptomycin biosynthetic gene cluster of Streptomyces griseus (1991)
    Springer
    Molecular genetics and genomics 229 (1991), S. 119-128 
    Details
    ISSN: 1617-4623
    Schlagwort(e): A-factor ; Streptomyces griseus ; Streptomycin biosynthesis ; Streptomycin resistance ; Gene expression
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary A-factor (2-isocapryloyl-3R-hydroxymethyl-γ-butyrolactone) is a microbial hormone controlling streptomycin (Sm) production, Sm resistance and sporulation in Streptomyces griseus. In order to identify A-factor-dependent promoters in the Sm biosynthetic gene cluster, a new promoter-probe plasmid with a low copy number was constructed by using an extremely thermostable malate dehydrogenase gene as the reporter. Of the three promoters in the Sm production region that includes strR, aphD and strB, only the promoter of strR, which codes for a putative regulatory protein, was found to be directly controlled by A-factor. This was also confirmed by S1 nuclease mapping. The region essential for its A-factor-dependence was determined to be located 430–330 base pairs upstream of the transcriptional start point. Increase in the copy number of the strR promoter region did not lead to a corresponding increase in the total promoter activity, probably due to titration of a putative activator which binds to the enhancer-like region and controls the expression of the strR promoter. This putative activator is apparently distinct from the A-factor-receptor protein. The aphD gene, which encodes the major Sm resistance determinant, Sm-6-phosphotransferase, was transcribed mainly by read-through from the A-factor-dependent strR promoter; this accounts for the prompt induction of Sm resistance by A-factor.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00264220
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  • 4
    Digitale Medien
    Digitale Medien
    Vinyl polymerization. 244Part 243. of the series: K. KUBUSHIRO, K. TAKEMOTO, and M. IMOTO, Makromolekulare Chem. 138 (1970) 1.. Polymerization of methyl and n-butyl methacrylate and n-butyl acrylate initiated by the system of cupra-rayon, water and carbon tetrachloride (1970)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 138 (1970), S. 11-17 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die Polymerisation von Methylmethacrylat wurde in Gegenwart von Cupra-rayon, Wasser und Tetrachlorkohlenstoff durchgeführt; sie verläuft radikalisch. Der Einfluß der zugesetzten Mengen an Monomerem, Cupra-rayon, Wasser oder Tetrachlorkohlenstoff auf die Polymerisationsgeschwindigkeit wurde untersucht, und aus den ermittelten Werten der Geschwindigkeiten wurde die Bruttoaktivierungsenergie im Temperaturbereich zwischen 70 und 90°C zu 9,7 kcal/Mol geschätzt. Weiter wurde gefunden, daß n-Butylacrylat sowie-methacrylat auch von dem oben erwähnten System polymerisiert werden, während Styrol und Acrylnitril sich nicht polymerisieren lassen.
    Notizen: Polymerization of methyl methacrylate was carried out in the presence of cupra-rayon, water and carbon tetrachloride. It was concluded that the process was of radical mechanism. The effects of the amount of methyl methacrylate, cupra-rayon, water or carbon tetrachloride on the rate of polymerization were investigated. From the rates of polymerization at 70-90°C, overall activation energy was estimated as 9.7 kcal/mole. n-Butyl acrylate and methacrylate were also polymerized by the above system. However, styrene and acrylonitrile did not polymerize.
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1970.021380102
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