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  • Springer  (227)
  • Institute of Physics  (62)
  • American Institute of Physics  (53)
  • EDP Sciences  (51)
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  • 1
    ISSN: 1432-072X
    Keywords: Key words K+-ATPase ; Lactobacilli ; Potassium pump ; 2 ; 3-Butanedione ; Enzyme-phosphate complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lactobacillus helveticus ATCC 15009 (wild-type) membrane preparations hydrolyzed Mg2+-ATP as a function of K+ concentration (2–200 mM). Mg2+-ATP hydrolysis by L. helveticus membranes was strongly inhibited in the absence of exogenous K+, while it amounted to 6 nmol ATP hydrolyzed min–1 (mg membrane protein)–1 at 50 mM KCl (saturating conditions) and pH 7.2. The K+-dependent ATPase of L. helveticus displayed a relatively high affinity for potassium ions (K m = 800 μM) and was not affected by pretreatment of membranes with N,N’-dicyclohexylcarbodiimide. Membrane preparations were subjected to hypotonic shock to obtain a maximum yield of open profiles. The formation of a maximum level of enzyme-phosphate complex with a molecular mass of approximately 82 kDa was induced upon treatment of L. helveticus membrane preparations with low concentrations of [γ-32P]ATP in the presence of K+ and La3+ ions and was visualized by acidic SDS-PAGE. It was concluded that L. helveticus membranes contain an inwardly directed K+ pump whose presence is discussed in terms of its putative role in cytoplasmic pH regulation.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1997-09-08
    Print ISSN: 0302-8933
    Electronic ISSN: 1432-072X
    Topics: Biology
    Published by Springer
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  • 3
    Publication Date: 2009-01-30
    Print ISSN: 0004-6361
    Electronic ISSN: 1432-0746
    Topics: Physics
    Published by EDP Sciences
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of mathematical biology 44 (1982), S. 103-117 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We have numerically examined more than one million Large Complex Systems (LCS) of interacting variables (interpretable as interacting populations) governed by Generalized Lotka-Volterra Equations (GLV), with self-regulation term. The scope was to have some insight on the stability-complexity relationship. We considered systems of prey-predator type, and we gave appropriate rules for constructing the model systems, rules that specify the behaviour of model systems in order to put them near the biological reality. The results show, among other things, a strict correlation between the stability and the prey-predator ratio (which, in our model, uniquely determines the connectedness of the system).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 75 (1981), S. 211-217 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is known that the counting rate of both Nai and Csi hard X-ray detectors can have intense enhancements of brief (〈1 s) duration, which appear like very short cosmic gamma-ray bursts but probably are due to phosphorescence in the detector itself. Unfortunately, this problem is not limited to short bursts. We present here three much longer (up to 80 s) pseudo-gamma-ray bursts observed during a transatlantic ballon flight. We conclude that detections of gamma-ray bursts (and probably also of hard X-ray source flares) based only on a rate increase by a single scintillator should always be confirmed by at least one other instrument.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 18 (1950), S. 143-147 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary It is shown how is possible to give pratical applications toEötvös' formulas on relations between gravitational and magnetic anomalies, in such a way as to obtain informations on magnetic properties of rocks that cause the anomaly. It follows the opportunity of executing together with torsion balance measures, in as much as possible, also magnetic measurements.
    Notes: Riassunto Viene mostrato come sia possibile dare pratiche applicazioni alle formule diEötvös sulle relazioni fra anomalie gravimetriche e magnetiche, in modo da ricavare le proprietà magnetiche delle rocce che causano l'anomalia. Da ciò l'opportunità di eseguire sempre unitamente a misurazioni con la bilancia di torsione anche misure magnetiche.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 7 (1945), S. 1-15 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary Applying the proceedings of Malkin verified by experiments of Ramsayer is studied the influence on the declination in upper levels of some magnetic anomalies in Italy, for which exist detailed reliefs in the vertical component (Colli Euganei, Stromboli). For the anomalous zones capable to influence the maintaining of the route in compass-airnavigation special maps are proposed containing the position of the isogons at various fondamental heights, an instance of which is presented for the isle of Stromboli. An examination of the magnetic anomalies in Italy shows the zones of probable and those of secure danger for compass-airnavigation as long as it will not be possible to prepare maps in the proposed type. For the rest of the Italian air-space the opportunity is prospected to construct the isogons for the pilots on the basis of the normal field.
    Abstract: Zusammenfassung Nach dem Malkinschen Verfahren wird der Einfluss einiger magnetischer Störgebiete (Colli Euganei, Stromboli) auf die Flugnavigation berechnet. Es wird vorgeschlagen, wo nötig, spezielle Deklinationskarten mit den Isogonen zu verschiedenen Haupthöhen vorzubereiten; ein Beispiel hiefür wird für die Insel Stromboli gegeben. Die Störgebiete, welche eine Gefahr für die Flugnavigation mit dem Magnetkompass bilden können, werden für Italien begrenzt. In dem übrigen Raum in Italien wird als das beste Verfahren für die Flugnavigation vorgeschlagen, die Isogonen nach dem vom Verf. berechneten Normalfeld darzustellen.
    Notes: Riassunto Con i procedimenti del Malkin, verificati sperimentalmente dal Ramsayer, viene intrapreso lo studio dell'influsso sulla declinazione in quota di alcune anomalie magnetiche in Italia, per cui esistono rilievi di dettaglio nella componente verticale (Colli Euganei, Stromboli). Per le zone anomale, capaci di influenzare il mantenimento della rotta nella navigazione aerea con la bussola, vengono proposte carte speciali con l'andamento delle isogone a varie quote fondamentali, di cui si presenta un saggio per l'isola di Stromboli. Attraverso un esame delle anomalie magnetiche in Italia, si indicano le zone di probabile e quelle di sicuro pericolo per la navigazione aerea con la bussola finchè non si potrà costruire per esse carte del tipo proposto. Per il rimanente spazio aereo italiano si prospetta l'opportunità che le isogone per i piloti siano costruite sulla base del campo normale.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 6 (1944), S. 23-36 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Der Verfasser behandelt den Beitrag des ital. Geogr. Mil. Instituts zur Erkenntniss des erdmagnetischen Feldes in Italien und anderen Gegenden. Einzelheiten werden über die magnetischen Karten von Italien gegeben und die Deklinationskarten für Libien, Albanien, Dalmatien, Mittelmeer, Schweiz und Ostmark, usw. erwähnt. Für Italien sind auch die Karten der magnetischen (ΔD und ΔH) und gravimetrischen (Faye und Bouguer) Isanomalen konstruiert worden.
    Notes: Riassunto Si riferisce sul contributo portato dall'Istituto Geografico Militare alla conoscenza del campo magnetico terrestre in Italia ed altre regioni (Libia, Albania, Etiopia). Si forniscono particolari sulle carte magnetiche d'Italia e sulle carte delle isogone per la Libia, Albania, Dalmazia, Mediterraneo, Austria, Svizzera costruite dall'I.G.M. Per lo studio della geologia profonda in Italia sono state preparate anche le carte delle anomalie magnetiche (declinazione e componente orizzontale) e gravimetriche (secondo Faye e secondo Bouguer).
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 6 (1944), S. 14-22 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Das erdmagnetische Feld in Albanien ist (zum ersten Mal) von Ital. Mil. Geogr. Institut studiert worden. Ein magnetisches Netz erster Ordnung von 65 Stationen (ungefähr 20 Km Punktabstand) inD, H undI wurde gemessen. Die Ergebnisse sind in einer Karte dargestellt, Massstab 1∶750.000, Isolinien am 1942,0. Ausser zwei ausgedehnten Störgebieten von Eruptivgesteinen (Eozän) in Nord-und Süd-Ost-Albanien, sind drei andere Regionalstörungen im Gebiet NO von Scutari, SW von Kruja und NW Koriza, und eine Lokalstörung SO von Valona zu erkennen. Die erste und die dritte sind wahrscheinlich den Ergussgesteinen zuzuschreiben.
    Notes: Riassunto Il campo magnetico terrestre in Albania è stato studiato (per la prima volta) dall'Istituto Geografico Militare attraverso l'esecuzione di una rete del 10 crdine (65 stazioni assolute nei tre elementiD, H edI a circa 20 Km l'una dall'altra). I risultati sono compendiati in una carta magnetica della regione, scala 1∶750.000, isolinee al 1942.0. Oltre a due zone molto estese di anomalie dovute a rocce eruttive del periodo eocenico nell' Albania settentrionale e sud-orientale, sono messe in evidenza altre tre importanti anomalie regionali nella regione a NE di Scutari, a SO di Kruja, a NE di Korcia ed una locale a SE di Valona. L'esame geofisico indica come probabile causa per la prima e la terza la presenza di rocce basiche a profondità non molto rilevanti (dell' ordine di qualche Km).
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 59 (1997), S. 657-664 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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