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  • 1
    Electronic Resource
    Electronic Resource
    Triple-helix formation is compatible with an adjacent DNA protein complex (1992)
    s.l. : American Chemical Society
    Biochemistry 31 (1992), S. 993-998 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00119a007
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  • 2
    Electronic Resource
    Electronic Resource
    Biosynthesis and characterization of poly(β-hydroxybutyrate) produced byBacillus circulans (1996)
    Springer
    Polymer bulletin 37 (1996), S. 429-435 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The biosynthesis of poly (β-hydroxybutyrate) (PHB) byBacillus circulans was carried out through cultivation in nutrient broth in a single step. $$\overline {\text{M}} {\text{v}}$$ of polymer fractions soluble in chloroform were close to 2 x 105. IR,1H and13C NMR spectra of the isolated PHB were in agreement with the assumed structure of this poly-β-hydroxyester. NMR spectroscopy pointed out a high percentage of isotactic polymer, while differential scanning calorimetry showed that the PHB was crystalline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556801
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  • 3
    Electronic Resource
    Electronic Resource
    Is the ancillary chemotherapy approach of any value in the treatment of infratentorial primitive neuroectodermal tumors with surgery and radiotherapy? (1998)
    Springer
    Child's nervous system 14 (1998), S. 109-112 
    Details
    ISSN: 1433-0350
    Keywords: Key words PNET ; Medulloblastoma ; Brain tumor ; Treatment ; Adjuvant chemotherapy ; Survival
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A retrospective historical analysis of patients under 18 years of age with the histopathological diagnosis of infratentorial primitive neuroectodermal tumor (PNET) is presented. The survey embraced two different groups of children. Group 1 was defined as those patients treated from 1972 to 1984 with surgical resection plus neuraxis radiotherapy alone. Group 2 was made up of children treated from 1990 to 1996 with the same approach but with the addition of adjuvant chemotherapy: cisplatin (day 1) and etoposide (days 1–3) every 3 weeks for 6 months. Group 1 embraced 42 children with an age range of 1– 16 years (mean 6 years, SD 4.4 years). In group 2 there were 34 children, their ages ranging from 1 to 18 years (mean 7.2, SD 4.6 years). The prevalence of stages T2M0 and T3M0 was similar in both groups, but in group 1 there were 4 patients (9.5%) whose spinal fluid was positive for tumor cells (M1), while in group 2 there were 7 children (20.5%) with positive spinal fluid. There was an unequivocal initial response to treatment in 86% of these children in group 1 and in 79% in group 2. The event-free survival (EFS) was 30% at 252 months in group 1, while for group 2 the EFS was 67.6% at 63 months (P 0.002). Mortality from tumor activity was noted in 26 patients (70%) in group 1, while in group 2 mortality attributable to tumor progression was documented in 11 children (32%). We conclude that the use of adjuvant chemotherapy in these patients improves survival without any significant morbidity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003810050189
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  • 4
    Electronic Resource
    Electronic Resource
    APMR2 tandem repeat with a modified C-terminus is located downstream from theKRS1 gene encoding lysyl-tRNA synthetase inSaccharomyces cerevisiae (1991)
    Springer
    Molecular genetics and genomics 227 (1991), S. 149-154 
    Details
    ISSN: 1617-4623
    Keywords: Saccharomyces cerevisiae ; Lysyl-tRNA synthetase ; PMR2 repeat ; Genome organization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary TheKRS1 gene encodes the cytoplasmic form ofSaccharomyces cerevisiae lysyl-tRNA synthetase. TheKRS1 locus has been characterized. The lysyl-tRNA synthetase gene is unique in the yeast genome. The gene is located on the right arm of chromosome IV and disruption of the open reading frame leads to lethality. These results contrast with the situation encountered inEscherichia coli where lysyl-tRNA synthetase is coded by two distinct genes,lysS andlysU, and further address the possible biological significance of this gene duplication. The nucleotide sequence of the 3′-flanking region has been established. It encodes a long open reading frame whose nucleotide and amino acid structures are almost identical toPMR2, a cluster of tandemly repeated genes coding for P-type ion pumps. The sequence alterations relative toPMR2 are mainly located at the C-terminus of the protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260720
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of temperature and solvent on the polymerization of 2-propenylfuran (1995)
    Springer
    Polymer bulletin 34 (1995), S. 57-62 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary 2-Propenylfuran was polymerized by trifluoroacetic acid in various solvents. The reactions were accomplished over the temperature range of -78 to 70°C depending on the solvent used. The kinetics of the polymerization in CCl4 at 0°C was second order. It was observed that the 2,5-disubstituted furan moiety in the chain grows as the dielectric constant of the solvents decreases and that the percentage of alkylated furan ring in the polymer increases with temperature independently from the solvent used. Both findings are explained by considering the possibility of 2-propenylfuran to propagate either by the C-5 position of the furan ring or by the vinyl bond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294888
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  • 6
    Electronic Resource
    Electronic Resource
    The cationic polymerization of 2-alkenylfurans, 2Part 1: cf.5. A side reaction leading to polyunsaturated products (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 2399-2413 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A spectroscopic and conductimetric study of the cationic polymerization of 2-vinylfuran (1) and 2-methyl-5-venylfuran (2) showed the existence of an important side reaction originating from a hydride-ion shift from an unsaturated polymer molecule to an active species. The resulting allylic carbocation, in equilibrium with a doubly unsaturated polymer molecule, can react further and the repetition of the mechanism on progressively more conjugated species leads to the formation of a series of highly charge-delocalized carbenium ions absorbing throughout the visible region of the spectrum (and giving high electrical conductivity) and of neutral polyconjugated polymer molecules. Since the hydride-ion abstraction occurs from the tertiary carbon atom of the vinylic chain, vinylidene polymers of monomers such as 2-isopropenylfuran (3) and 2-isopropenyl-5-methylfuran (4) are not susceptible to it. Indeed, their cationic polymerization proceeds without colour formation and conductivity increase.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021831010
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  • 7
    Electronic Resource
    Electronic Resource
    Theoretical approach to cationic polymerization of alkenylfuranes (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 281-287 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The molecular species proposed for the initial steps in the cationic polymerization of alkenylfurans were modeled by MNDO theoretically fully optimized structures. It was confirmed that the anomalous reactivity of ring C-5 of the monomers is determined by HOMO electron densitites, whereas calculated proton affinities from the semiempirical heats of formation fail to explain the low temperature experimental behavior of 2-vinylfuran (1c) from the point of view of stability of intermediate species. However, ab initio 4-31G calculations of proton affinities agree with the experimental facts and allow further explanations of the reactivity of furan derivatives in electrophilic media.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910202
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  • 8
    Electronic Resource
    Electronic Resource
    The cationic polymerisation of 2-alkenylfurans, 3Part 2: cf. 2.. Spectroscopic study of the alkylation as important side reaction leading to branched products (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1189-1211 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A spectroscopic (UV, IR, 1H NMR) study of the cationic polymerisation of 2-vinylfuran (1a) and 2-isopropenylfuran (2a) showed the existence of an important alkylation reaction at C5 which competes with normal propagation. The extent of this competition depends on the monomer used and the polymerisation temperature. A comparison of the spectra of standard polymers (prepared by radical or stereospecific polymerisation) with those of polymers obtained by cationic initiation allowed to assess the extent of alkylation and its regiospecificity at C5 2-Methyl-5-vinylfuran (1b) and 2-methyl-5-isopropenylfuran (2b) were found to undergo cationic polymerisation without any interference from alkylation reactions. Reactions between these four monomers and 2-methylfuran in the presence of typical acidic catalysts gave very high yields of alkylated products and no polymerisation, thus confirming the importance of this electrophilic reaction and its possible application to synthetic uses.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840608
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  • 9
    Electronic Resource
    Electronic Resource
    Composites from furfuryl alcohol and inorganic solids by cationic initiation, 2Part 1: cf. ref.1.. Spectroscopic studies of poly(furfuryl alcohol)-silica composites obtained by trifluoroacetic acid initiation (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 1537-1544 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Furfuryl alcohol polymerizes in a suspension of dispersed inorganic solids such as silica in 1,2-dichloroethane using trifluoroacetic acid as initiator. Depending on the experimental conditions the reactions load to (1) agglomeration of particles, (2) composite and soluble polymer formation, (3) composite formation. The chemical structure of the soluble polymers is not regular but the furfurylic sequence is predominant. The polymer grafted on the surface of the solid is a strongly reticulated poly(furfuryl alcohol), which also possesses conjugated double bonds that are involved in an acid-base equilibrium with trifluoroacetic acid.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940602
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  • 10
    Electronic Resource
    Electronic Resource
    Polymerization of furfuryl alcohol with trifluoroacetic acid: the influence of experimental conditions (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 1-9 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Furfuryl alcohol was polymerized by trifluoroacetic acid in methylene chloride to give a colored polymer. This polymer possesses two main sequences in which the furan rings are connected by methylene groups (sequence 1) or by dimethylene ether groups (sequence 2). The polymer is not linear but highly branched, as detected by 1H and 13C NMR spectroscopy. Variations of the experimental conditions, such as the presence of air, the trifluoroacetic acid concentration, the reaction temperature and the solvent, do not allow a significant increase in the linear structure of the polymer. However, an increase in the acid concentration or an increase in temperature produce a decrease in the ether-bridged structure (sequences 2).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021930101
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