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  • Springer  (166)
  • Institute of Physics  (24)
  • Wiley-Blackwell  (22)
  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 57 (1970), S. 456-456 
    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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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 73 (1986), S. 374-375 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 59 (1994), S. 179-185 
    ISSN: 1432-0649
    Keywords: 32.80.Pj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report some laser-cooling effects in a few172Yb+ ions held in a Paul trap. Pronounced cloud-to-crystal phase transitions have been observed as discontinuities in the Yb+ fluorescence spectrum of the 369 nm cooling transition. The first reported two-dimensional images of Yb+ clouds with evidence of crystal structure have been recorded using a photon-counting position-sensitive detector. An ion temperature of 100 mK has been estimated from the size of a single ion image. Step-wise cooling of a re-heated, few-ion Yb+ cloud was also observed.
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 50 (1990), S. 13-17 
    ISSN: 1432-0649
    Keywords: 32.80P
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 172Yb+ ions in an rf trap have been laser cooled for the first time by driving the 2 S 1/2–2 P 1/2 transition at 369.5 nm. It was necessary to irradiate the ions with 2.438 μm infra-red radiation to depopulate the metastable 2 D 3/2 state. An upper limit on ion energies was determined by observing the size of the trapped cloud and corresponds to a temperature below 2 K. Cooled ion lineshapes were compared with simulations and coherence nulls were observed in the infra-red frequency scans.
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  • 15
    Electronic Resource
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    Springer
    Applied physics 61 (1995), S. 385-390 
    ISSN: 1432-0649
    Keywords: 32.80.P1 ; 42.55.P
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of weak magnetic fields (≤ 1 mT) on small clouds and single ions of strontium has been studied. The fluorescence rate and hence the cooling efficiency is sharply reduced for fields of less than around 0.2 mT. The magnetic field also splits the various levels involved through the Zeeman effect. In particular, the2 S 1/2−2 D 5/2 transition at 674 nm, which is the basis for a potential optical frequency standard, is split into a maximum of 10 components, depending upon the experimental geometry. This is studied for various configurations of the magnetic field and 674 nm laser polarization. The implication for frequency-standards work is that the standard will need to be operated in a small but highly stable field.
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 34 (1913), S. 1291-1311 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 17
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Factors related to pathogenesis were studied in a murine model of pulmonary fungal infection with strains of Blastomyces dermatitidis. Strain 26199V was ⩾105-fold more lethal in pulmonary challenge than strain GA-1. This relationship between the two strains also occurred after intraperitoneal challenge. Serial studies with lung cultures and histology of sacrificed animals after pulmonary challenge with similar doses, and challenge studies in mice of differing maturity, indicated GA-1 is impaired in initial replication in situ, although the two strains grow equally well in the presence of murine substrates in vitro. In vitro studies indicated the two strains were indistinguishable in most studies of biochemical and metabolic markers, and in studies with chemical and physical inhibitors. The exceptions were their morphologic appearance in the yeast phase, ability to hydrolyze esculin, and susceptibility to crystal violet dye and bile. The last finding and previous work suggested possible differences in lipid content; these were confirmed in studies which also included two other strains. Greater phospholipid and palmitic acid content were associated with greater virulence.
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Histochemistry and cell biology 4 (1964), S. 238-251 
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung 1. Es wird die Verteilung des den Pentosephosphat-Cyclus einleitenden Fermentes Glukose-6-phosphat-Dehydrogenase in den verschiedenen Strukturen gesunder Organe beschrieben und nach Organsystemen gegliedert in Tabellenform wiedergegeben. 2. Die stärkste Enzymaktivität ist im Epithelgewebe, in den Drüsen mit innerer Sekretion und in Gliazellen des Nervensystems festzustellen. 3. Die Bedeutung des Pentosephosphat-Cyclus für die Bereitstellung von Ribose und TPNH-abhängiger Synthesen wird am Beispiel des enzymaktiven Epithelgewebes und der ebenfalls fermentaktiven Drüsen mit innerer Sekretion besprochen.
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Histochemistry and cell biology 21 (1970), S. 369-381 
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung In der vorliegenden Arbeit wird ein Verfahren zur autoradiographischen Bestimmung des Zellzyklus der Erythroblasten in vitro angegeben. Die Knochenmarkzellen wurden bei +37°C in autologem oder homologem Plasma, das H3- bzw. C14-Thymidin enthielt, bei verschiedenen O2-Drücken inkubiert. Zur Bestimmung der DNS-Synthesezeit wurde das Doppelmarkierungsverfahren und zur Bestimmung der G2-Phase das „%-markierte-Mitosen-Verfahren” angewandt. Vergleichende in vivo- und in vitro-Messungen zeigten, daß bei 2,2 atü reinen O2 bei der hier angewandten in vitro-Methode das Wachstumsverhalten der Erythroblasten beim Tier und offenbar auch beim Menschen den in vivo gefundenen Werten entspricht.
    Notes: Summary This paper describes an in-vitro-method for the autoradiographical determination of the cell cycle of erythroblasts (rat, mouse, and man). The bone marrow cells were incubated (37° C) for two hours in autologous or homologous plasma containing H3- and C14-thymidine respectively. For determination of DNA synthesis time the double labeling technique, for estimation of the premitotic G2-phase the method of labeled mitoses was applied. The comparison of in vivo and in vitro measurements shows that using 2,2 atm of pure oxygen by the described in-vitro-method the cell proliferation kinetics of erythroblasts of rat, mouse, and man were approximately the same as in vivo.
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  • 20
    Electronic Resource
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    Springer
    Human genetics 〈Berlin〉 28 (1975), S. 217-220 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Eine Familie mit 2 autoptisch gesicherten Neuroblastomen, einem Ganglioneuroblastom und Hinweisen auf 3 weitere Neuroblastome wurde cytogenetisch untersucht. Anlaß war der von Sandberg et al. (1972) mitgeteilte Befund von double-minute-Chromosomen in Lymphocyten des peripheren Blutes bei einem Neuroblastom. Die Untersuchung sollte klären, ob in dieser “Neuroblastom-Familie” eine chromosomale Aberration als erbliche Vorschädigung die Entstehung von Sympathicustumoren begüngstigt. Es fanden sich keine konstanten Chromosomenanomalien, auch keine double-minute-Chromosomen.
    Notes: Summary A cytogenetic investigation was performed in a family which included 2 individuals with congential neuroblastomas of the suprarenal gland confirmed by autopsy and one with a ganglioneuroblastoma of the thoracic wall as well as 3 other individuals with tumors which probably were also neuroblastomas. The lymphocytes of the peripheral blood of 5 healthy relatives as well as of the child with the treated ganglioneuroblastoma failed to show a constant alteration of chromosomes. In this family, therefore, the suggestion could not be proofed that the very rate familial aggregation of neuroblastomas is caused by a hereditary chromosomal aberration.
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