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  • 1
    Electronic Resource
    Electronic Resource
    Metabolic flexibility of Clostridium acetobutylicum in response to methyl viologen addition (1994)
    Springer
    Applied microbiology and biotechnology 42 (1994), S. 611-616 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Batch cultures of Clostridium acetobutylicum, were examined with 0, 0.1 and 1 mM methyl viologen addition at four different controlled pH values (between 4.5 and 6.5). Methyl viologen addition diverted the electron flow: reducing equivalents normally released as molecular hydrogen were directed towards NAD(P)H formation. Production of butanol, the most reduced non-gaseous product, was sharply increased (0.65 mol/mol glucose) at the expense of acetone and butyric and acetic acids. In addition to butanol and lactate production, NADH excess induced the formation of glycerol, a product that has never been reported to be formed by C. acetobutylicum. Metabolic perturbation brought about by the electron carrier led to a reduction of the growth rate and an increase of the lag phase. A correlation between the shape of the redox potential curve and the switch from an acidogenic to a solventogenic metabolism is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173928
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  • 2
    Electronic Resource
    Electronic Resource
    Metabolic flexibility of Clostridium acetobutylicum in response to methyl viologen addition (1994)
    Springer
    Applied microbiology and biotechnology 42 (1994), S. 611-616 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Batch cultures of Clostridium acetobutylicum, were examined with 0, 0.1 and 1 mM methyl viologen addition at four different controlled pH values (between 4.5 and 6.5). Methyl viologen addition diverted the electron flow: reducing equivalents normally released as molecular hydrogen were directed towards NAD(P)H formation. Production of butanol, the most reduced non-gaseous product, was sharply increased (0.65 mol/mol glucose) at the expense of acetone and butyric and acetic acids. In addition to butanol and lactate production, NADH excess induced the formation of glycerol, a product that has never been reported to be formed by C. acetobutylicum. Metabolic perturbation brought about by the electron carrier led to a reduction of the growth rate and an increase of the lag phase. A correlation between the shape of the redox potential curve and the switch from an acidogenic to a solventogenic metabolism is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050301
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  • 3
    Electronic Resource
    Electronic Resource
    Possible involvement of indolamines in the glycogenic effect of the convulsant methionine sulfoximine in rat brain (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 710-713 
    Details
    ISSN: 1420-9071
    Keywords: Methionine sulfoximine ; epileptogenesis ; serotonin ; glycogen ; glucose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The aim of the present investigation was to look for the mechanisms causing disturbances in carbohydrate metabolism during the action of the epileptogenic agent methionine sulfoximine The levels of glucose, glycogen, and indolamines were measured in seven different regions of rat brain. Methionine sulfoximine induced a decrease in serotonin level which was roughly dose-dependent. There were no obvious, changes in tryptophan and 5-hydroxyindoleacetic levels in any area. Methionine sulfoximine induced the known increase in glucose and glycogen levels. The direct precursor of serotonin, 5-hydroxytryptophan, and benserazide (a decarboxylase inhibitor) were then injected into rats in association with methionine sulfoximine. In this case, methionine sulfoximine failed to induce seizures. Moreover, the serotonin level was unchanged and the carbohydrate content did not significantly increase. There was only a rise in 5-hydroxyindoleacetic acid level. This work shows a striking parallelism between serotonin decrease and glycogen increase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01939942
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  • 4
    Electronic Resource
    Electronic Resource
    Multipliers for the convolution algebra of left and rightK-finite compactly supported smooth functions on a semi-simple Lie group (1984)
    Springer
    Inventiones mathematicae 75 (1984), S. 9-23 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01403087
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  • 5
    Electronic Resource
    Electronic Resource
    Le théorème de Paley-Wiener invariant pour les groupes de Lie réductifs (1984)
    Springer
    Inventiones mathematicae 77 (1984), S. 427-453 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01388832
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  • 6
    Electronic Resource
    Electronic Resource
    Coefficients généralisés de séries principales sphériques et distributions sphériques surG ℂ/G ℝ (1991)
    Springer
    Inventiones mathematicae 105 (1991), S. 305-346 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01232269
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  • 7
    Electronic Resource
    Electronic Resource
    Différenciation ultrastructurale des jonctions intercellulaires de l'endothélium des capillaires télencéphaliques chez l'embryon de poulet (1972)
    Springer
    Cell & tissue research 133 (1972), S. 571-582 
    Details
    ISSN: 1432-0878
    Keywords: Brain capillaries ; Chicken ; Intercellular junctions ; Differentiation ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Au cours du développement embryonnaire du Poulet, les cellules endothéliales des bourgeons vasculaires et des capillaires néo-formés du télencéphale sont unies par des jonctions transitoires au niveau desquelles les feuillets externes des membranes plasmiques n'ont pas fusionné et sont séparés par un espace intercellulaire mesurable. Des points de fusion de ces feuillets externes apparaissent peu à peu et au hasard dans la zone du contact intercellulaire. Entre ces points persistent des espaces intercellulaires qui assurent encore la communication entre la lumière du capillaire et l'espace extracellulaire du tissu nerveux. L'adjonction de nouveaux points de fusion, entre ceux existant déjà, conduit à la disparition progressive de l'espace intercellulaire et à la formation de véritables zonulae occludentes.
    Notes: Summary During the embryonic development of the chick, the endothelial cells of the vascular sprouts and of the newly-formed capillaries in the telencephalon are linked by transitory junctions at the level of which the external leaflets of the plasma membrane are not fused and are separated by a measurable intercellular space. Some points of fusion of these external leaflets gradually appear at random in the area of the intercellular contact. Between these points of fusion, some intercellular spaces persist which still allow the communication between the capillary lumen and the extracellular space in the nervous tissue. The adjunction of new points of fusion between the preexisting ones, leads progressively to the disappearance of these intercellular spaces and to the formation of true zonulae occludentes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307137
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  • 8
    Electronic Resource
    Electronic Resource
    Towards a Paley-Wiener theorem for semisimple symmetric spaces (1991)
    Springer
    Acta mathematica 167 (1991), S. 127-151 
    Details
    ISSN: 1871-2509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02392448
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  • 9
    Electronic Resource
    Electronic Resource
    Ultrastructure des capillaires dans le télencéphale du poulet au cours de l'embryogenèse et de la croissance postnatale (1968)
    Springer
    Cell & tissue research 87 (1968), S. 592-602 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Resumé Une étude en microscopie électronique de la structure des capillaires et des formations cellulaires qui les entourent a été faite au niveau du télencéphale, chez le Poulet, au cours du développement embryonnaire et de la croissance postnatale. L'endothélium capillaire est présent au premier stade embryonnaire étudié (embryon agé de 8 jours). La membrane basale se différencie vers le dix-neuvième jour du développement embryonnaire, et elle est précédée de l'apparition des péricytes qui restent inclus définitivement dans sa structure. L'espace extracellulaire dans l'environnement des capillaires, constitué par de larges lacunes au cours du développement embryonnaire, se réduit dès l'éclosion à des intervalles de 150–200 Å de diamètre. Les astrocytes et leurs prolongements (pieds vasculaires) atteignent leur complet développement, et entourent totalement le capillaire, vers le vingtième jour de la croissance postnatale. Nos observations mettent en évidence la relation étroite existant entre le développement des structures gliales péricapillaires et l'apparition de certains mécanismes du système de la barrière hémo-encéphalique chez le Poulet.
    Notes: Summary An electron microscopical study was made of the structure of the capillaries and of the surrounding cell formations in the chick telencephalon, during embryonic development and postnatal growth. The capillary endothelium is present in the embryonic stage first studied (i. e. the 8-day old embryo). The basement membrane differentiates about the nineteenth day of embryonic development, and it is preceded by the appearance of the pericytes which are finally included in its structure. The extracellular space in the vicinity of the capillaries, made of large gaps during the embryonic development, is confined from hatching time to intervals 150–200 Å diameter. The astrocytes and their processes (vascular feet) reach their complete development, and entirely surround the capillaries, on about the twentieth day of the postnatal growth. Our observations reveal the close connection between the development of the pericapillary glial structures and the appearance of some mechanisms of the blood-brain barrier system in the chick.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325588
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  • 10
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    Possible involvement of indolamines in the glycogenic effect of the convulsant methionine sulfoximine in rat brain (1990)
    Springer
    Details
    Publication Date: 1990-07-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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