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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 71 (1999), S. 229-242 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary ¶On August the 11th, 1999 Central Europe saw a spectacular astronomical event, a total solar eclipse. We present a model study concerning the meteorological effects of this eclipse in central Europe using the state-of-the-art limited area forecast model Deutschland-Modell DM from the German Weather Service DWD. Under typical summer radiation conditions very strong anomalies in the surface energy flux and temperature in screen height are simulated. The main temperature signal in the lower troposphere is delayed by about one hour with respect to the surface. Furthermore it is connected with a well defined dynamical signal which is reminiscent to a large scale land – sea circulation. The event could be used as a test case for mesoscale atmospheric models.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 251 (1996), S. 388-396 
    ISSN: 1617-4623
    Keywords: Escherichia coli ; Colicin M ; Immunity ; Periplasm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Colicin M (Cma) displays a unique activity that interferes with murein and O-antigen biosynthesis through inhibition of lipid-carrier regeneration. Immunity is conferred by a specific immunity protein (Cmi) that inhibits the action of colicin M in the periplasm. The subcellular location of Cmi was determined by constructing hybrid proteins between Cmi and the TEM-β-lactamase (BlaM), which confers resistance to ampicillin only when it is translocated across the cytoplasmic membrane with the aid of Cmi. The smallest Cmi'-BlaM hybrid that conferred resistance to 50 μg/ml ampicillin contained 19 amino acid residues of Cmi; cells expressing Cmi'-BlaM with only five N-terminal Cmi residues were ampicillin sensitive. These results support a model in which the hydrophobic sequence of Cmi comprising residues 3–23 serves to translocate residues 24–117 of Cmi into the periplasm and anchors Cmi to the cytoplasmic membrane. Residues 8–23 are integrated in the cytoplasmic membrane and are not involved in Cma recognition. This model was further tested by replacing residues 1–23 of Cmi by the hydrophobic amino acid sequence 1–42 of the penicillin binding protein 3 (PBP3). In vivo, PBP3'-'Cmi was as active as Cmi, demonstrating that translocation and anchoring of Cmi is not sequence-specific. Substitution of the 23 N-terminal residues of Cmi by the cleavable signal peptide of BlaM resulted in an active BlaM'-'Cmi hybrid protein. The immunity conferred by BlaM'-'Cmi was high, but not as high as that associated with Cmi and PBP3'-'Cmi, demonstrating that soluble Cmi lacking its membrane anchor is still active, but immobilization in the cytoplasmic membrane, the target site of Cma, increases its efficiency. CmiΔ1-23 remained in the cytoplasm and conferred no immunity. We propose that the immunity protein inactivates colicin M in the periplasm before Cma can reach its target in the cytoplasmic membrane.
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  • 3
    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.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 51 (1964), S. 509-510 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 102 (1971), S. 924-927 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Standardbildungsenthalpie von UCl5 [ΔH B ,298/0 UCl5 (s)=−247,7±0,5 kcal/Mol (−1036,4±2,1 kJ/ Mol)] wurde bestimmt, indem man Uran mit gasförmigem Chlor in Gegenwart eines Überschusses an flüssigem Chlor bei 298° K zur Reaktion brachte.
    Notes: Abstract The standard enthalpy of formation of UCl5 has been determined as ΔH f ,298/0 UCl5 (s)=−247.7±0.5 kcal/mol (−1036.4±2.1 kJ/mol) by reacting uranium with chlorine gas in the presence of excess liquid chlorine at 298° K.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 99 (1968), S. 652-657 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Für Untersuchungen über das Viskositäts- und Dichte-Temperatur-Verhalten und andere physikalische Eigenschaften wurden Äther-Ester und einige Diäther des Äthylenglykols synthetisiert. Die Verbindungen sind so ausgesucht, daß sie in einem experimentell leicht zugänglichen Temperaturbereich kinematische Viskositäten zwischen 1 und 15 cSt aufweisen.
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  • 7
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Zur Untersuchung des Viskositäts-Temperatur-Verhaltens wurden weitere 23 gemischte Diäther des Äthylenglykols und Diäthylenglykols, und zwar vier homologe Reihen, dargestellt, deren Arbeitsvorschriften und physikalische Eigenschaften mitgeteilt werden.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Das Viskositäts-Temperatur-Verhalten von 45 gemischten Äthern des Glykols, Diglykols, Triglykols und Butandiols-(1,4) wird diskutiert. Innerhalb der homologen Reihen der Äther steigt die Viskosität, jedoch nimmt die Temperaturabhängigkeit ab, und zwar stärker als bei den Paraffinen vergleichbarer Kettenlänge (Tab. 1 und 2). Ausgehend von derUmstätter-Gleichung wird eine Form entwickelt, die die Berechnung der „Steilheit”n vereinfacht. Als zweite Kennzahl für das Viskositäts-Temperaturverhalten wird die Temperatur benutzt, für diev=1 cSt wird.
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  • 9
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Es wird über nucleophile Substitutionen, Ringschlüsse und Fragmentierungen an Pentaerythrit-halogen- bzw. Pentaerythrit-tosylverbindungen unter dem Einfluß nucleophiler Agenzien (Alkoxylat, Alkalihalogenid, Phenolat) berichtet: Formelschema 1.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Planta 167 (1986), S. 140-145 
    ISSN: 1432-2048
    Keywords: Alkaline pyrophosphatase ; Amyloplast ; Arum (starch synthesis) ; Glycine (starch synthesis) ; Starch synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of this work was to see if amyloplasts contained inorganic pyrophosphatase. Alkaline pyrophosphatase activity, largely dependant upon MgCl2 but not affected by 100 μM ammonium molybdate or 60–100 mM KCl, was demonstrated in exracts of developing and mature clubs of the spadix of Arum maculatum L. and of suspension cultures of Glycine max L., but not in extracts of the developing bulb of Allium cepa L. The maximum catalytic activity of alkaline pyrophosphatase in the above tissues showed a positive correlation with starch synthesis, and in the first two tissues was shown to exceed the activity of ADPglucose pyrophosphorylase. Of the alkaline pyrophosphatase activity in lysates of protoplasts of suspension cultures of Glycine max, 57% was latent. Density-gradient centrifugation of these lysates showed a close correlation between the distribution of alkaline pyrophosphatase and the plastid marker, nitrite reductase. It is suggested that much, if not all, of the alkaline pyrophosphatase in suspension cultures of Glycine max is located in the plastids.
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