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  • 1
    Electronic Resource
    Electronic Resource
    Temperature mediated changes of d-xylose metabolism in the yeast Pachysolen tannophilus (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 72 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract We found that during d-xylose fermentation to ethanol by Pachysolen tannophilus the amount of xylitol produced decreased dramatically while CO2 increased when the temperature was raised from 30 to 37°C. Acetaldehyde was detected only at 37°C. However, no significant change in the amount of ethanol production was observed. A similar trend was observed when the cells were treated with 10 μM 2,4-dinitrophenol. Furthermore, the enzyme d-xylose reductase displayed a similar activation energy in cells grown either at 30 or 37°C. These data suggest that in P. tannophilus oxidative phosphorylation becomes uncoupled at higher temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb03857.x
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  • 2
    Electronic Resource
    Electronic Resource
    Gene for chronic proximal spinal muscular atrophies maps to chromosome 5q (1990)
    [s.l.] : Nature Publishing Group
    Nature 344 (1990), S. 767-768 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/344767a0
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  • 3
    Electronic Resource
    Electronic Resource
    Growth, development, feeding preference, and food consumption and utilization by tobacco hornworm on tobacco mosaic virus-infected and non-infected tobacco leaves (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 521-524 
    Details
    ISSN: 1420-9071
    Keywords: Manduca sexta ; tobacco mosaic virus ; tobacco hornworm ; plant pathogen/insect interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Plant disease may cause a variety of changes in plants which influence their suitability to insect herbivores. The reported physiological changes in tobacco due to infection by tobacco mosaic virus have the potential to influence the feeding, growth and behavior of the tobacco hornworm,Manduca sexta. However, feeding on foliage of systematically infected plants had no statistically significant effects on development time, mean pupal weight or the amount of foliage consumed by 4th instars. Although an initial preference was exhibited by larvae for healthy leaves after about 72 h no differences were observed. These results do not support the results of previous research on the influence of tobacco mosaic virus-infected plants on the tobacco hornworm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954253
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of dietary nicotine and colony source ofManduca sexta [Lepidoptera: Sphingidae] on its suitability as a host ofCotesia congregata [Hymenoptera: Braconidae] (1990)
    Springer
    BioControl 35 (1990), S. 223-231 
    Details
    ISSN: 1573-8248
    Keywords: Manduca sexta ; nicotine ; Cotesia congregata ; strains ; Manduca sexta ; nicotine ; Cotesia congregata ; souches
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Une expérimentation a été entreprise afin de déterminer si les différences enregistrées entre deux colonies distinctes deM. sexta, affectées également par le régime nicotiné, influencent le développement, la survie et la taille de son parasitoïdeCotesia congregata. Les sphynx du tabac d'une colonie du Maryland et de la Caroline du Nord ont été élevés sur un milieu à 0,1 % de nicotine et exposés au parasitisme parC. congregata. Les individus de la colonie du Maryland furent en général de meilleurs hôtes que ceux de la colonie de Caroline du Nord. Bien que la nicotine ait des effects négatifs sur les deux colonies, ceux-ci furent plus sévères chez les individus parasitant les sphynx de Caroline du Nord.
    Notes: Abstract Larval tobacco hornworms,Manduca sexta (L.), of 2 different colonies were exposed to parasitism by the gregarious endoparasitoid,Cotesia congregata (Say). A comparison was made of parasitoid larval, pre-pupal, and pupal mortality, female and male dry weight and larval development time. In general, “Maryland” hornworms were more suitable hosts than “North Carolina” hornworms. Although the presence of dietary nicotine increased parasitoid mortality in individuals reared from hornworms of both colonies, the effect was more severe among individuals parasitizing the North Carolina hornworms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374797
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  • 5
    Electronic Resource
    Electronic Resource
    Allelochemicals in foliage of unfavored tree hosts of the gypsy moth,Lymantria dispar L. (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 1731-1738 
    Details
    ISSN: 1573-1561
    Keywords: Ilex opaca ; Aquifoliaceae ; Lymantria dispar ; gypsy moth ; Lepidoptera ; Lymantriidae ; saponins ; siaresinolic acid ; qualitative plant defenses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A greater variety of qualitative chemical defenses has been reported in eastern forest trees than might be expected from current interpretation of the plant apparency theory. For the gypsy moth there is an association between the occurrence of alkaloids and unfavorability of certain tree species, as well as the presence of saponins. The latter association, however, is not statistically significant. Species in the genusIlex have been reported to contain both alkaloids and saponins (Barbosa and Krischick, 1987). In this study, determinations were made of the occurrence of alkaloids and saponins inI. opaca and their changes in concentration over time. No alkaloids were detected. Saponins were isolated, and the aglycone siaresinolic acid was identified. Saponin concentration changes seasonally, being highest in early May and lowest in early June leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01014104
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  • 6
    Electronic Resource
    Electronic Resource
    Allelochemicals in foliage of unfavored tree hosts of the gypsy moth,Lymantria dispar L. (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 1719-1730 
    Details
    ISSN: 1573-1561
    Keywords: Lymantria dispar ; Lepidoptera ; Lymantriidae ; Liriodendron tulipifera ; Acer rubrum ; Cornus florida ; gypsy moth ; alkaloids ; N-methyl-crotsparine ; 1-(3,4,5-trimethoxyphenyl)-2-(4-allyl-2,6-dimethoxy)propane ; bisphenylpropanoid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Early theories on plant chemical defense against herbivory emphasized that apparent and unapparent plants were primarily defended by different types of compounds. More and more evidence suggests that both quantitative and qualitative defenses are found in apparent plants and that they can play a defensive role against herbivores. A survey of the literature on the gypsy moth suggests not only that there is a large variety of qualitative compounds, as well as the expected quantitative ones, but that unfavored hosts of the gypsy moth are associated with the presence of alkaloids. Foliage of three tree species,Liriodendron tulipifera L.,Acer rubrum L., andCornus florida L., was examined to confirm the presence of alkaloids and other major secondary metabolites. The known sesquiterpene lactone, lipiferolide, and the sugar derivative, liriodendritol, were components ofL. tulipifera leaves, along with a bisphenylpropanoid previously found only in nutmeg. Alkaloid content [i.e., (−)-N-methylcrotsparine content] was low and leaves tested positive for HCN. Leaves ofA. rubrum L. were examined for the presence of gramme, but none could be detected. No alkaloids were detected inCornus florida.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01014103
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of dietary nicotine (0.1%) and parasitism by Cotesia congregata on the growth and food consumption and utilization of the tobacco hornworm, Manduca sexta (1990)
    Springer
    Entomologia experimentalis et applicata 57 (1990), S. 1-8 
    Details
    ISSN: 1570-7458
    Keywords: Tobacco hornworm ; Manduca sexta ; parasitoids ; Cotesia congregata ; allelochemicals ; nicotine ; nutritional indices ; tri-trophic interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Bien que les influences des substances allélochimiques des plantes et du parasitisme aient été étudiées séparément, leurs effets combinés sur l'utilisation des aliments après ingestion par un herbivore n'avaient pas été examinés. Il est probable que les substances allélochimiques peuvent agir sur l'adéquation des herbivores pour leurs parasitoïdes, ou que la présence de parasitoïdes peut influer sur l'action des substances allélochimiques sur les indices nutritionnels des herbivores. Manduca sexta L. et son parasitoïde, Cotesia congregata Say fournissent un bon modèle pour étudier les interactions entre parasitisme et substances allélochimiques sur la croissance, la consommation et l'utilisation de la nourriture ingérée chez les larves de M. sexta. Les taux de croissance, la consommation et l'efficacité de la conversion des chenilles de 33 et 43 stades ne sont pas influencés significativement par les intéractions entre nicotine alimentaire et parasitisme. Cependant, le parasitisme réduit le taux de croissance des chenilles du 5e stade, ce qui se traduit par une réduction de leur consommation. La digestibilité des aliments ingérés a été augmentée chez les chenilles parasitées, mais non lorsque l'aliment consommé contenait de la nicotine. L'examen des valeurs de ECD et de ECI montre que l'ingestion de nicotine alimentaire réduit l'efficacité de la conversion des aliments digérés et ingérés par des chenilles non-parasitées, mais ces indices étaient supérieurs à ceux des chenilles parasitées. Ces résultats suggèrent que lorsque les chenilles sont parasitées après la mue du 33 stade, C. congregata n'influence pas l'alimentation de son hôte jusqu'à ce qu'il atteigne le dernier stade. La nicotine, dans les tissus de l'hôte, dépasse les effets du parasitisme. Il est probable qu'aucun des changements observés ne provient d'un effet direct sur les processus d'assimilation et de conversion mais plutôt de l'exposition des parasitoïdes à la nicotine dans l'hémolymphe de la chenille.
    Notes: Abstract The interactive effects of dietary nicotine (0.1%) and parasitism by Cotesia congregata (Say) (Braconidae) on post-ingestive utilization of food by the tobacco hornworm, Manduca sexta (L.) (Sphingidae) were studied in the laboratory. The rates of growth and consumption and the food utilization indices of third and fourth instar hornworms were not significantly influenced by the interactive effect of dietary nicotine and parasitism. However, parasitism reduced the growth rate of fifth instar hornworms, resulting from a reduction in their consumption rate. Efficiency of digestion of ingested food was enhanced in parasitized larvae, but not when they ingested diets containing nicotine. Ingestion of dietary nicotine reduced the efficiency of conversion of digested and ingested food of unparasitized hornworms as reflected in ECD and ECI values, but these indices were larger than in parasitized hosts. Results suggest that when hornworm larvae are parasitized after ecdysis to the third instar, C. congregata does not influence feeding by its larval host until the host reaches its terminal instar. Nicotine, within host tissues, ‘over-rides’ any effect caused by parasitism. It is probable that any change observed may not result from a direct effect on the assimilation and conversion processes of the hornworm larva but due to parasitoids' exposure to nicotine in the hornworm's hemolymph.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349589
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  • 8
    Electronic Resource
    Electronic Resource
    Histochemical and ultrastructural studies on the enterochromaffin-like cell in the gastric mucosa of the opossum Didelphis albiventris (Marsupialia) (1990)
    Springer
    Cell & tissue research 262 (1990), S. 425-430 
    Details
    ISSN: 1432-0878
    Keywords: Stomach ; Enteroendocrine cells ; Enterochromaffin-like (ECL) cell ; Enterochromaffin cell (EC) ; Histamine ; Ultrastructure ; Secretory granules ; Didelphis albiventris (Marsupialia)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An ultrastructural study of enterochromaffin-like (ECL) cells in the gastric mucosa of the white-belly opossum Didelphis albiventris (Marsupialia) was carried out. In parallel, histochemical methods were used at the light-microscopical level to demonstrate argentaffin cells, argyrophilic cells, and serotonin- and histamine-immunoreactive elements. Argentaffin and serotonin-immunoreactive cells were scattered, and argyrophilic cells were numerous, within the full thickness of the mucosa. Argyrophilic cell distribution was similar to that of histamine-immunoreactive elements. At the electron-microscopical level, the oxyntic mucosa of D. albiventris presented endocrine cells with secretory granules morphologically similar to those of the ECL cell of eutherian mammals. However, in this marsupial, the ECL cell exhibited a variable mixture of two distinct types of secretory granules: (1) granules with the morphological appearance of the eutherian ECL cell, and (2) granules morphologically similar to those of the eutherian enterochromaffin (EC) cells. Based on this morphological pattern of the ECL cell granules, it is proposed that in the oxyntic mucosa of the opossum D. albiventris, the EC and ECL cells represent distinct steps in the same line of cell differentiation; the ECL cell should also be a site of histamine storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305239
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  • 9
    Electronic Resource
    Electronic Resource
    Differential effects of eight metal ions on lymphocyte differentiation antigens in vitro (1990)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 24 (1990), S. 1059-1068 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: In vitro studies were conducted to determine the effects of metal ions known to be released from metallic implants in vivo on the expression of lymphocyte surface antigens. Normal human peripheral blood lymphocytes were exposed to various concentrations of metal ions (Fe3+, Ni2+, Co2+, Mo6+, V5+, Cr6+, Cr3+, and Ti3+) for 30 min at 37°C in a 5% CO2 atmosphere, and then analyzed for their ability to form rosettes with sheep red blood cells. Following this preliminary analysis, lymphocytes were exposed to the metal ions found to inhibit the E-rosette reaction (Fe3+, Ni2+, and Co2+) in order to determine which of the following surface antigens were affected: CD2, CD3, CD4, CD8, CD1, CD22, CD10, and HLA-DR. Our results showed that the in vitro treatment of lymphocytes with Fe3+ or Co2+ caused inhibition of CD2 only, whereas Ni2+ caused inhibition of both CD2 and CD3 antigens. These findings suggest that Fe3+, Co2+, and Ni2+ ions may interfere with T cell activation since both CD2 and CD3 are involved in that process.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820240808
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  • 10
    Electronic Resource
    Electronic Resource
    Three-dimensional discrete element method for granular materials (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 14 (1990), S. 451-472 
    Details
    ISSN: 0363-9061
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: This paper describes a three-dimensional discrete element method of analysis for granular materials. Individual particles are modelled as rigid, six-sided solids with six degrees of freedom. Various types of contacts are possible among the three-dimensional discrete elements. Models for these contact types are described. Computational aspects of the method, such as techniques for contact detection and data structure, are addressed. Selective results of three examples that demonstrate the application of the method to granular flow problems are presented and discussed.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nag.1610140702
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