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  • Articles  (48)
  • 1980-1984  (48)
  • Biology  (48)
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  • Articles  (48)
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  • 1
    Electronic Resource
    Electronic Resource
    Detection of Clostridium difficile toxin in suckling mice (1981)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 12 (1981), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1981.tb07672.x
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  • 2
    Electronic Resource
    Electronic Resource
    The amino acid sequence of the β-subunit: Of porcine enterotoxigenic Escherichia coli enterotoxin — Analysis and comparison with literature data (1984)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 25 (1984), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The amino acid composition and sequence of the β-subunit of heat-labile enterotoxin (LT) purified from a porcine (LTp) strain, WT-1, of enterotoxigenic Escherichia coli was analysed, and the result was compared with that reported by Dallas and Falkow [Nature 288 (1980) 499-501] who deduced the amino acid sequence of LTp from data on the DNA sequence of a porcine strain, EWD299. The purified β-subunit of the LTp of WT-1 was carboxymethylated, succinylated, digested with chymotrypsin and subjected to high performance liquid chromatography (HPLC). The amino acid composition of the peptide peaks from the column were analysed and compared with the data reported by Dallas and Falkow. Only one fraction differed in amino acid composition from that reported, containing lysine instead of methionine. This fraction was found to consist of two peptides with the sequences Lys-Ser-Gly-Glu-Thr-Phe and Arg-Ile-Thr-Tyr. The former peptide is reported to have the sequence Met-Ser-Gly-Glu-Thr-Phe. Thus, the amino acid at position 43 from the N terminus of the β-subunit of LTp is lysine, not methionine as reported. This is the first report which studied the amino acid sequence of LTp analysed by protein toxin itself, not by DNA sequence analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1984.tb01465.x
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  • 3
    Electronic Resource
    Electronic Resource
    Grouping of enterotoxigenic Escherichia coli by hydrophobicity and its relation to hemagglutination and enterotoxin productions (1983)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 17 (1983), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1983.tb00417.x
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of amino acids from reactor-irradiated ammonium acetate (1982)
    Springer
    Origins of life and evolution of the biospheres 12 (1982), S. 339-345 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Ammonium acetate in various conditions was irradiated in a reactor to examine the contributions of both the reactor radiations and recoiled14C nucleis to form the biologically interesting molecules. Present investigations demonstrated that several amino acids, glycine, alanine, β-alanine and GABA, and may-be aspartic acid, serine and valine by prolonged irradiation, were formed in the aqueous solutions of ammonium acetate.14C-radioactivities were also found distributed in these amino acids. However, no special relationship between14C-radioactivity and these amino acids formed was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00927065
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  • 5
    Electronic Resource
    Electronic Resource
    Measurements of 129 I in meteorites and lunar rock by tandem accelerator mass spectrometry (1983)
    [s.l.] : Nature Publishing Group
    Nature 305 (1983), S. 611-612 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The 129I in meteorites is produced by cosmic ray secondary neutron reactions on tellurium1"3, and the 129I in lunar surface materials is produced mainly by spallation on barium and rare earth elements. Because of the difficulty in measuring concentrations of only a few times 106 atoms per g in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/305611a0
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  • 6
    Electronic Resource
    Electronic Resource
    The relationship between ribosomal repeat length and genome size in Vicia (1984)
    Springer
    Chromosoma 89 (1984), S. 1-7 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The organization of the ribosomal RNA genes was examined in several species of Vicia in an attempt to determine whether a relationship exists between genome size and ribosomal repeat length. Species within this genus exhibit a sevenfold variation in haploid DNA content. Our data suggest that species with an intermediate genome size maintain one predominant Eco RI class of ribosomal repeat of about 9 kilobases (kb). In contrast, the smallest and largest genomes of Vicia possess one major and several minor classes. The possible relationship between repeat classes among species is discussed. We examined the species with the smallest (V. villosa) and largest (V. faba) genomes in closer detail by R-loop analysis of a satellite DNA from Hoechst 33258 dye-CsCl gradients. Heterogeneity was found in the length of the ribosomal repeat for both species, but no appreciable difference was observed in the distribution of these lengths, which averaged 11–12 kb. This heterogeneity is associated with the nontranscribed spacer region. Intervening sequences were not found in either the 25S or 18S coding regions of the ribosomal repeat of either of these two plants. A putative ribosomal RNA precursor of 7 kb was identified for both species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302343
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  • 7
    Electronic Resource
    Electronic Resource
    Cytochemical demonstrations of protease in human peripheral blood cells by use of new α-naphthyl ester substrates (1983)
    Springer
    Histochemistry and cell biology 77 (1983), S. 299-302 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The proteases of human leukocytes were cytochemically studied by use of new α-naphthyl esters, tosyl-l-lysine-α-naphthyl ester (TLNE) and acetyl-l-tyrosine-α-naphthyl ester (ATNE). The hydrolytic activities were strong only in neutrophils, with both substrates. They were inhibited completely by DFP and chymostatin, but not by leupeptin and iodoacetate. These results indicate that chymotrypsin-like enzyme(s), capable of hydrolyzing both substrates, exist in neutrophils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00490892
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  • 8
    Electronic Resource
    Electronic Resource
    Genetic regulation of erythrocyte autoantibody production in New Zealand black mice (1983)
    Springer
    Immunogenetics 18 (1983), S. 241-254 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The incidences of positive anti-erythrocyte autoantibodies (AEA) in New Zealand Black (NZB), C57BL/6, their F1, F2 hybrid, and the F1 × NZB backcross mice were 100, 0, 0, 17, and 51%, respectively. This finding is in keeping with the idea that a combined effect of one to three dominant predisposing NZB gene(s) and a single dominant modifying C57BL/6 gene regulates the AEA production. Studies suggested that the modifying locusAem-1 is loosely linked toMup-1 locus on chromosome 4, and the gene order isAem-1: Mup-1: Gpd-1. We analyzed the effects of theAem-1 locus on other autoimmune traits and found that the gene action ofAem-1 is unrelated to the spontaneous productions of dsDNA-specific antibodies, the retroviral gp70-anti-gp70 immune complexes and natural thymocytotoxic autoantibod ies and to the serum level of retroviral gp70. A significant association was observed between the negative AEA and the low (normal) serum IgM level in (C57BL/6 × NZB)F1 × NZB backcross mice. It remains to be determined whether theAem-1 locus also controls the serum IgM level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00952963
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  • 9
    Electronic Resource
    Electronic Resource
    Larval osmeterial secretions of the swallowtails (Papilio) (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 1089-1113 
    Details
    ISSN: 1573-1561
    Keywords: Osmeterial secretion ; Papilio larvae ; Lepidoptera ; monoterpene ; sesquiterpene ; aliphatic acid ; ester
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The larval osmeterial secretions of sixPapilio species examined displayed a remarkable qualitative change at the fourth larval ecdysis. The secretions of 4th (penultimate) instar larvae ofP. machaon, P. memnon, P. helenus, P. bianor, andP. maackii principally comprised mono- and/or sesquiterpenoids. The compounds identified from these species included α-pinene, sabinene, β-myrcene, limonene, β-phellandrene, (Z)-β-ocimene, (E)-β-ocimene, β-elemene, β-caryophyllene, (E)-β-farnesene, β-selinene, (E,E)-α-farnesene, germacrene-A, germacrene-B, caryophyllene oxide, methyl 3-hydroxy-n-butyrate, and acetic acid. In contrast, the secretion of 4th larval instar ofP. xuthus, although containing similar terpenic compounds, was accompanied by large amounts of aliphatic acids and their esters: isobutyric acid, 2-methylbutyric acid, methyl isobutyrate and methyl 2-methylbutyrate. On the other hand, the osmeterial secretions of 5th (last) instar larvae varied little in quality among the six species, and the identified compounds consisted of isobutyric acid, 2-methylbutyric acid, methyl isobutyrate, ethyl isobutyrate, methyl 2-methylbutyrate, ethyl 2-methylbutyrate, and isovaleric acid, the last of which was specific toP. bianor andP. maackii. The chemical alteration of osmeterial exudate synchronized at the final larval ecdysis with the larval morphological change (particularly in body coloration) that appears to be of defensive significance against predators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987631
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  • 10
    Electronic Resource
    Electronic Resource
    Odor of a papilionid butterfly (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 867-873 
    Details
    ISSN: 1573-1561
    Keywords: Male scent ; Atrophaneura alcinous ; Lepidoptera ; Papilionidae ; benzaldehyde ; phenylacetaldehyde ; 2-phenylpropenal ; n-heptanal ; 6-methylhept-5-en-2-one ; linalool
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Benzaldehyde, phenylacetaldehyde (major component), 2-phenylpropenal,n-heptanal, 6-methylhept-5-en-2-one, and linalool were identified as compounds responsible for the male scent ofAtrophaneura alcinous alcinous. These substances were present predominantly in the wings, and the quantity of them was largest at the inner margin of the hind wing. Female wings also contained some of them in much smaller (except a few components) amounts. The relative proportion of each component exhibited manifests sexual differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990470
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