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  • 1970-1974  (17)
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Materialart
Erscheinungszeitraum
Jahr
Schlagwörter
  • 11
    Digitale Medien
    Digitale Medien
    Force-free magnetic fields and flares of August 1972 (1973)
    Springer
    Solar physics 33 (1973), S. 187-204 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstracts On the basis of observations (Zirin and Tanaka, 1973) inferring the presence of shear in magnetic fields, the amount of extractable energy stored in a class of force-free magnetic fields is evaluated for the flares of August 1972, using the formulations developed by Nakagawa and Raadu (1972). It is shown that the evaluated energy storage could be built up by the proper motions of sunspots in the active region McMath 11976 during July 31 and August 7. Then for the flare of August 7, a detailed analysis is made of the manner of energy release in the post maximum phases deduced from the configuration of flare loops. It is shown that the observed flare loops could be represented closely by the force-free magnetic fields and that the evaluated rate of energy release is consistent with observed rate given by the soft X-ray emission. The results of analysis suggest that the flare of August 1972 could be identified with the relaxation of an energetic force-free magnetic field towards lower energy states. The limitations and possible future extension of this type of analysis are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00152390
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  • 12
    Digitale Medien
    Digitale Medien
    Biochemical and genetic studies on two different types of erythromycin resistant mutants of Escherichia coli with altered ribosomal proteins (1973)
    Springer
    Molecular genetics and genomics 127 (1973), S. 175-189 
    Details
    ISSN: 1617-4623
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Ribosomes from nine E. coli mutants with high level resistance to the antibiotic erythromycin were isolated and their proteins were compared with those of the parental strains by two-dimensional polyacrylamide gel electrophoresis, by carboxymethylcellulose column chromatography and by immunological techniques. Two 50S proteins were found to be altered in the mutants: either L 4 or L 22. Ribosomes with an altered L4 protein bound erythromycin rather poorly and the formation of N-acetylphenylalanyl puromycin was drastically decreased. On the other handribosomes with an altered L22 protein bound erythromycin as efficiently as wild type ribosomes and their puromycin reaction was at least as good as that of wild type ribosomes. Transduction experiments showed that the mutations affecting both proteins, L4 and L22, are located very close to the str and spc genes, nearer to the spc than to str gene.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00333665
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  • 13
    Digitale Medien
    Digitale Medien
    Chloramphenicol resistant mutants of Bacillus subtilis (1973)
    Springer
    Molecular genetics and genomics 127 (1973), S. 163-173 
    Details
    ISSN: 1617-4623
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Telve chloramphenicol resistant (CM r)-mutants were isolated from B. subtilis ATCC 6633 and were classified into the following six groups. Group I. No 50s ribosomal protein change was detectable. Ribosomes did not show alteration of the binding ability to CM or to erythromycin in vitro. Group II. A 50s protein, 50a, was altered. Ribosomes did not show alteration of the binding ability to CM or to erythromycin in vitro. The genes specifying the 50a protein was in the cysA-str region on B. subtilis chromosome. Group III. A 50s protein, 50b, was altered. Biological properties of the ribosomes were the same as Group I or II so fas as examined. The genes for 50b protein was in the cysA-str region. Group IV. A 50s protein, 50c, was altered. Ribosomes showed a definite decrease in ability to bind to CM in vitro. The binding of erythromycin to the ribosomes was not impaired. The chromosomal locus of the CM r (and for 50c protein) was in the cysA-str region. Group V. A 50s protein, 50e, was changed. The ability of the ribosomes to bind in vitro both to CM and to erythromycin was greatly reduced. The genetic locus of the CM r (and for 50e protein) was in the cysA-str region. Group VI. A 50s protein, 50f, was altered. Ribosomes showed a decrease in ability to bind in vitro both to CM and to erythromycin. The genes for 50f protein was in the cysA-str region. The results suggest that the ribosomal resistance to CM may be caused by an independent change of at least several 50s ribosomal protein species. The genetic data shown here and those reported previously show that at least two 30s and seven 50s ribosomal protein genes are situated in the cysA-str region on B. subtilis chromosome.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00333664
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  • 14
    Digitale Medien
    Digitale Medien
    Erythromycin resistant mutants of Bacillus subtilis (1973)
    Springer
    Molecular genetics and genomics 127 (1973), S. 157-161 
    Details
    ISSN: 1617-4623
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Erythromycin resistant (ery r) mutants were isolated from Bacillus subtilis ATCC 6633. The composition of ribosomal proteins were analyzed for thirteen such ery r-mutants with chromatography on a carboxymethyl cellulose (CMC) column. The 50s subunit from all of the ery r-mutants was found to contain the altered 50d protein. The ribosomes prepared from the ery r-mutants did not show in vitro alteration of the ability to combine with erythromycin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00333663
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  • 15
    Digitale Medien
    Digitale Medien
    Fusion of particulate structure in polyvinyl chloride during powder extrusion (1972)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 12 (1972), S. 199-203 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: It has been recognized recently that suspension polyvinyl chloride granules consist of particles ca 1μ in diam which are linked together to form a three-dimensional, sponge-like lattice. This paper deals with the fusion process of this particulate structure of PVC resin during powder extrusion. Extrudates prepared under various extrusion conditions are investigated through the electron microscope using a methyl methacrylate (MMA) embedding method followed by ultrathin sectioning. The MMA embedding method has been proven to be an effective means of revealing the detailed structure of molded PVC. Results showed that the 1μ-particles were subjected to breakdown due to heat and shear into fibrils 100-300 Å in thickness, which were the final structure attainable by extrusion. Discussion was focused on the fibrillar structure especially in relation to the elasticity in plasticized PVC.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760120307
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  • 16
    Digitale Medien
    Digitale Medien
    The Effect of Sulphur Dioxide on the Development of Pine Needle Blight Caused byRhizosphaera kalkhoffii Bubák (I). Die Wirkung von Schwefeldioxyd auf die Entwicklung vonRhizosphaera kalkhoffii Bubák an Kiefernnadeln (I) (1970)
    Springer
    Journal of pest science 43 (1970), S. 159-159 
    Details
    ISSN: 1612-4766
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02040976
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  • 17
    Digitale Medien
    Digitale Medien
    Growth and morphology of single crystals of linear aliphatic polyesters (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 9 (1971), S. 2043-2060 
    Details
    ISSN: 0449-2978
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: In order to elucidate the relations between morphological habits and chemical structure of polymers, poly(ethylene sebacate), poly(hexamethylene sebacate) and poly(decamethylene 1,16-hexadecanedicarboxylate) were crystallized from dilute solutions in n-hexanol, isoamyl acetate etc., and were studied with the electron microscopy and x-ray diffraction. The crystal structure of these polyesters are tentatively determined. Morphological “regularity” and “simplicity” of the single crystals are correlated with the chemical structure of the polymers. The crystallization conditions under which “regular” and “simple” single crystals are obtained are relaxed with increase of methylene sequence length in chemical repeat unit. The Bragg extinction bands in the single crystals of poly(hexamethylene sebacate) and poly(decamethylene 1,16-hexadecanedicarboxylate) suggest nonplanar nature of these crystals. The molecular chains in the poly(ethylene sebacate) single crystals are inclined from the normal of the basal plane; the fold surface corresponds to the (001) plane.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1971.160091109
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