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  • Springer  (16)
  • American Geophysical Union (AGU)  (1)
  • American Meteorological Society (AMS)
  • American Geophysical Union
  • 1980-1984  (17)
  • 1
    ISSN: 1615-6110
    Keywords: Lichens ; Rhizocarpon effiguratum ; Rhizocarpon norvegicum ; Rhizocarpon pusillum ; Rhizocarpon superficiale ; Depsides ; depsidones ; pulvinic acid derivatives ; chemotaxonomy ; high performance liquid chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The secondary lichen products of 31 specimens of theRhizocarpon superficiale group are examined by high performance liquid chromatography (HPLC). At 260 nm 13 different compounds have been detected. 6 of them are well-known lichen acids which occur in nearly all the species; but proportions are different and constant for each species. An analytical key is added.
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  • 2
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Nach Röntgenbestrahlung embryonierterCapillaria hepatica-Eier mit 0.5, 1 bzw. 2 Krd war bei den aus den Eilarven nach Infektion vonMastomys natalensis hervorgegangenen weiblichen Nematoden die Eiproduktion zunehmend reduziert. Sie unterblieb nach Bestrahlung mit 3, 4, 5, 10, 30, 50 bzw. 70 Krd. Die Leberinvasionsfähigkeit der Parasiten war nicht beeinträchtigt. Die Infektion vonM. natalensis mit unbestrahlten embryonierten Eiern führte bereits zwischen dem 6. und 8. Tag p.i. zu einem Anstieg der Serum-GLDH-Aktivitäten. Er erreichte in dieser Phase der Infektion die Höchstwerte. Hohe Werte wurden auch nach Beginn der Patenz festgestellt. Die erhöhte Aktivität hielt bis zum Versuchsende am 36. Tag p.i. an. Nach Infektion mit 2,2 bzw. 5 Krd bestrahlten Eiern waren die Aktivitätserhöhungen geringer und traten im Verlauf der Infektion mit 5 Krd bestrahlten Eiern auch verzögert auf. Nach Infektion mit unbestrahlten Eiern ließen sich im indirekten Hämagglutinationstest mit wässrigem Antigenextrakt aus nicht embryonierten Eiern die ersten Antikörper bereits 1 Woche p.i. nachweisen. Die Höchsttiter traten mit Beginn der Patenz auf. Nach anschließendem fast plateauartigem Verlauf setzte etwa mit Beendigung der Eiproduktion ungefähr um die 7. Woche p.i. ein kontinuierlicher Titerabfall ein. Der Antikörpernachweis gelang jedoch bis zum Versuchsende 17 Wochen p.i. — Nach Infektionen mit 2,2 bzw. 5 Krd bestrahlten Eiern gelang der Antikörpernachweis erst später. Die erreichten Höchsttiter waren geringfügig (2,2 Krd) bzw. auffällig (5 Krd) niedriger. Der anschließende Titerabfall führte zur Annäherung an die Werte nicht infizierterM. natalensis. Die Ergebnisse werden vergleichend mit an anderer Stelle mitgeteilten Befunden zur Leberpathohistologie der Capillariasis diskutiert.
    Notes: Abstract X-ray irradiation of embryonatedCapillaria hepatica eggs using 0.5, 1, or 2 Krd resulted in a progressive decrease of egg production of the female nematodes which had developed from irradiated first stage larvae inMastomys natalensis. Egg production did not occur after irradiation with 3, 4, 5, 10, 30, 50, or 70 Krd. The capacity of the parasites to invade the liver was not influenced. Infection ofM. natalensis using unirradiated eggs was followed by an increase of serum-GLDH-activities between days 6 and 8 post infection reaching maximum values in this period of infection. Furthermore high values have been determined after the beginning of patency. Increased activity persisted up to the end of the experiment on day 36 post infection. After infection with eggs which had received 2.2 or 5 Krd the increase of serum-GLDH-activities was decreased and occurred later in the course of infection using 5 Krd irradiated eggs. Antibodies could be demonstrated as early as one week after infection with unirradiated eggs. Employing the indirect haemagglutination test, using an aqueous extract from non-embryonated eggs as antigen, maximum titres occurred at the beginning of patency. After a nearly plateau-like course titres began to drop about 7 weeks p.i., i.e. about the end of egg production by the female worms, but antibodies were still detectable 17 weeks p.i. (end of the observation period). After infection with eggs which had received 2.2 or 5 Krd antibody development was delayed. Maximum titres were some-what (2.2 Krd) or markedly (5 Krd) lower. Thereafter titres dropped to values comparable to those of uninfectedM. natalensis. The results are compared with published reports on the pathohistology of capillariasis.
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  • 3
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Crude aqueousLitomosoides carinii adult worm extract was used as antigen for the detection of antibodies in sera from African patients with proven onchocerciasis (n=45) resident in rural endemic areas of Togo and Sierra Leone. In 71% of cases this extract was found to produce 1 to 5 precipitation arcs in immunoelectrophoresis. Using a crude aqueous extract from adultOnchocerca volvulus, precipitation tests were positive in 75% of cases. The complexity of theL. carinii curde extract was shown by PAG-disc electrophoresis, PAG-electrofocusing, immunoelectrophoresis and crossed immunoelectrophoresis with the appropriate rabbit-antiserum. An antigen detecting onchocercal antibodies was isolated by two step preparative flat bed electrofocusing in granulated gel (PEGG). The antigen (pI 6.55, molecular weight 55 to 60 kd as estimated by SDS-PAG electrophoresis) was very suitable for antibody demonstration in double diffusion test and immunoelectrophoresis. Preliminary controls for specificity were performed by diffusing the antigen against sera from human and animal helminthoses including filarial infections. In contrast to the crudeL. carinii extract no reaction was observed with sera from helminthic infections others than filariasis.
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  • 4
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract It is proposed that the rotational angular momentum of the lower Main Sequence stars determines the intensity of their magnetic spot activity. As a consequence of this feedback coupling, the stellar rotation and the activity decay exponentially by magnetic braking of the induced stellar flare- and wind-activity. Therefore, the Sun should have rotated much faster and must have shown a very enhanced activity in its early history. This strong solar activity in the past could have had influenced the evolution of terrestrial life, and may explain the stagnation of maritime life for about 2×109 yr, the diversification of species during the Cambrian formation, and the land conquest by life in the upper Silurian system.
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  • 5
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Over 100 sedimentary formations and groups are known from the epicontinental to continental Mesozoic (“Oriente Andino” sensu H.Bürgl) in the Andean region of Peru, Ecuador and Colombia. These lithostratigraphic (or facial) complexes are attached to 6 magnafacies-units which follow each other chronologically, thereby clearly evidencing a uniform paleogeographic-sedimentary development in the mentioned areas, although the geological structure of the Western respectively Coastal Cordilleras of the North (Colombia, Ecuador) is fundamentally different from that of the Southern ones (Peru, Chile).
    Abstract: Resumen Más de 100 grupos y formaciones sedimentarios des »Oriente Andino« (sensu H.Bürgl) en los Andes septentrionales (PerÚ, Ecuador, Colombia) están asociados a 6 unidades magnafaciales que se suceden cronológicamente. Este »Oriente Andino« abarca las cuencas sedimentarias de tipo epicontiental a continental de la época mesozoica. Se bosqueja así claramente, en las áreas mencionadas, una evolución paleogeográfica-sedimentológica bastante uniforme, aunque las estructuras geológicas de las Cordilleras Occidentales (o Costeras, respectivamente) de la parte septentrional (Colombia, Ecuador) se diferencian fundamentalmente de las del Sur (PerÚ, Chile).
    Notes: Zusammenfassung Die weit über 100 sedimentären Formationen und Gruppen im mesozoischen epikontinentalen bis kontinentalen „Oriente Andino“ der nördlichen Anden (Peru, Ekuador und Kolumbien) werden 6 zeitlich aufeinanderfolgenden Magnafazies-Einheiten zugeordnet. Dabei zeichnet sich deutlich eine einheitliche paläogeographisch-sedimentäre Entwicklung in den genannten Räumen ab, obwohl sich der geologische Bau der andinen West- bzw. Küstenkordilleren im Norden (Kolumbien, Ekuador) grundsätzlich vom Süden (Peru, Chile) unterscheidet.
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  • 6
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract During a seventeen day period an A. niger fungus ball evolved within a healed tuberculous cavity of a patient. Symptoms were a cough with a chocolate brown expectoration and dyspnea. The patient died and necropsy was performed. Crystals of calcium oxalate were deposited in the cavity lining and in the adjacent tissue of the lung. Fibrosis, mononuclear infiltration and intraalveolar purulent exudate were seen in these tissues. Some small vessels presented recent thrombosis and deposition of calcium oxalate. The bronchus connected with the cavity presented a disrupted epithelial layer, edema, polymorphonuclear infiltration and birefringent crystals. Scattered areas of tubular atrophy, glomerular sclerosis and lymphoid infiltration were seen in the cortex of the kidney. Oxalate crystals were also seen within the renal tubuli.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 69 (1980), S. 495-503 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Linear correlations between the diameter log Φ of ring-shaped nebulae and the total number logN of embedded stars for two absolute magnitude levels of −2m and +2m for the LMC have been found. This shows that less luminous stars are also contributing towards the illumination of the nebulae. A method for the determination of relative ages of these loop nebulae is described.
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  • 8
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A structural study of the old globular cluster NGC 1806 in the LMC has been carried out by star counts onB- andV-ESO 3.6 m telescope plates with three different limiting magnitude levels. The star density distribution was obtained directly from the surface strip count function with the Plummer formalism and the generalized Schuster law according to Lohmann. This yields beside the central density the structural parametern and the characteristic length parameterR 0 for each individual colour and magnitude level. The results show that the blue stellar content of NGC 1806 — the horizontal branch stars — is more concentrated towards the cluster center than the red giant and subgiant objects. Also such a dynamical mass segregation is observed for the red giants compared with the subgiants.
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  • 9
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A blue object was identified on POSS prints. Its position coincides with an X-ray source found by the HEAO-B satellite.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 97 (1983), S. 225-227 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract HEAO-B (Einstein) satellite measurements with the Imaging Proportional Counter revealed the W UMa binary system TZ Bootis as an X-ray source. It is estimated that the luminosity ratioL x/Lvof this system is about 10−3.8 indicating that TZ Bootis is in the transition region between A- and W-type W UMa systems.
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