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  • Springer  (147)
  • American Association for the Advancement of Science (AAAS)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 29 (1990), S. 39-46 
    ISSN: 1436-6215
    Keywords: thiamine (vitaminB 1) ; pregnancy ; intrauterine growth retardation (IUGR) ; Thiamin (Vitamin B1) ; Schwangerschaft ; intrauterineMangelentwicklung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Der Gehalt an Thiamin (Vitamin B1) wurde im mütterlichen Blut jeweils in den Blutzellen und im Plasma bei normalem Schwangerschaftsverlauf und bei Schwangerschaft mit intrauteriner Mangelentwicklung des Feten bestimmt. Die Bestimmung der Thiaminkonzentration erfolgte mit der Thiochrom-Methode mittels HPLC-Trennung und anschließender fluorimetrischer Bestimmung nach der Methode von Weber et al. (2). Bei normalem Schwangerschaftsverlauf ist ein Abfall des Thiamingehalts in den Blutzellen von 230 nmol/l bis 170 nmol/l von der 28. bis zur 39. Schwangerschaftswoche zu beobachten. Bei schwerer intrauteriner Mangelentwicklung ist nur ein geringer Abfall des Thiamingehaltes von 140 nmol/l in der 30. Schwangerschaftswoche bis zu einem Gehalt von 130 nmol/l in der 39. Schwangerschaftswoche zu beobachten. Demgegenüber bleiben die Thiaminwerte in Plasma annähernd konstant. Um die Thiaminkonzentrationen bei normaler Schwangerschaft und bei schwerer intrauteriner Mangelentwicklung zu vergleichen, führten wir eine Einteilung in zwei Gruppen — eine von 28/0 bis 34/6 und eine von 35/0 bis 39/6 Schwangerschaftswochen durch. In beiden Gruppen waren die Thiaminwerte in den Blutzellen bei normaler Schwangerschaft signifikant höher als bei intrauteriner Mangelentwicklung (p=0,0001 und p=0,0005). Die Thiaminwerte im Plasma unterschieden sich jedoch nicht signifikant bei normalem Schwangerschaftsverlauf und bei Schwangerschaften mit intrauteriner Mangelentwicklung. Unsere Ergebnisse deuten darauf hin, daß mütterlicher Thiaminmangel einen Grund für eine intrauterine Mangelentwicklung darstellt.
    Notes: Summary The concentration of thiamine (vitamin B1) was measured in blood cells and plasma from mothers with normal pregnancy and from mothers whose pregnancy was complicated by intrauterine growth retardation (IUGR). Thiamine concentrations were estimated by the thiochrome method using HPLC separation and fluorimetric detection according to Weber et al. (2). During normal pregnancies the thiamine values in blood cells fall in the 28th to the 39th week of gestation from 230 nmol/l to 170 nmol/l. In cases with severe IUGR there is only a slight decrease in the thiamine levels from 140 nmol/l in the 30th week of gestation to a level of 130 nmol/l in the 39th week of gestation. During this period the thiamine values in plasma remain constant. To compare the thiamine concentrations in normal pregnancies and in those with IUGR we separated the thiamine values in a group from 28/0 to 34/6 and one from 35/0 to 39/6 weeks of gestation. In both groups mothers with normal pregnancy had significantly higher thiamine levels in the blood cells than mothers whose pregnancy was complicated by IUGR (p=0.0001 and p=0.0005). However, the thiamine values in plasma were not significantly different in normal pregnancies and pregnancies with IUGR. The results indicate that maternal thiamine deficiency might be one cause of IUGR.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 207 (1967), S. 505-510 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Mössbauer effect of theγ rays from the 74.5 keV state of Dy161 and the 80.7 keV state of Dy162 has been investigated. From hyperfine splitting patterns the magnetic moments μ(75 keV)=−(0.39±0.04) nm, μ(81 keV)=+(0.74±0.08) nm and the quadrupole momentQ(75 keV)=+(1.4±0.2)b have been determined. For the odd neutron nucleus Dy161 an effective spin g factorg s, eff=0.76 gs, free is deduced for the 75 keV level.
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  • 3
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production of fermium isotopes was attempted by complete fusion of different targets and projectiles spanning a wide range of effective entrance channel fissilities below and above the predicted threshold valuex eff thr ≃0.7. For the most asymmetric systems where fusion is expected to occur without dynamical hindrance we investigate to what extent the expected amount of sub-barrier fusion contributes to the production of fermium evaporation residues. For increasingly symmetric systems the experimental fusion barriers are found to exceed the fusion barriers predicted by the proximity formalism. The barrier heights are discussed in the framework of both the extra-push model and the surface friction model.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 13 (1957), S. 25-27 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the larval epidermal trunk region ofSalamandra maculosa, the total number of mitoses of both sides is approximately the same. This applies to the differentiated Leydig cells as well as to the rest of the epidermis cells. With respect to the meristic segmentation of the trunk, we find within the single segments a regular rise of the mitotic rate, which alternates from one side to the other. From the total number of mitoses found in the epidermis of the trunk, approximately 40% can be accounted for to the dorsal and 60% to the ventral region of the trunk. The number of cells is the same for both the ventral and dorsal region.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 16 (1960), S. 540-542 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mammary glands of the white mouse in different stages of lactation were fixed in Carnoy's fluid and the sections stained with Gallocyanin-chromalum für microscopic observation. After dislocation of the nucleolus to the nuclear membrane or the formation of a heterochromatic pathway between nucleolus and nuclear membrane the extrusion of nucleolar substance into the cytoplasm was observed.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 30 (1974), S. 1076-1077 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Light and electron microscope observations of the air sacs of the larva ofCorethra (Chaoborus)plumicornis reveal a network of nerve fibres scattered amongst the epithelium. In the axoplasma, accumulations of vesicles (synaptoid) are found. The arrangement and structure of these nervous elements make it possible to discuss the physiological colour change ofCorethra in terms of a double control mechanism.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 26 (1970), S. 1349-1350 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Nerve fibers in the olfactory bulb of the minnow with a mean diameter of 1.5 μm contain transversally arranged membranous septa with a periodicity of approximately 1 μm. These profiles are fenestrated by pores, each of them being occupied by a neurotubulus. The septa are connected by longitudinally arranged membranous tubuli.
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  • 8
    ISSN: 1572-879X
    Keywords: ellipsometry ; methane ; palladium ; palladium oxide ; oscillations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ellipsometry is used to follow the growth of a PdO layer on the surface of a thick Pd-film catalyst during methane oxidation at ∼ 500°C. The oxide layer that develops under rich conditions (excess CH4) is quite porous and roughens with time. Little CO is formed during this period, but the CO2 formation rate increases until spontaneous oscillations develop, which correlate with changes in the ellipsometric data. These changes indicate that the porous oxide rapidly converts to a metal-rich state, which has decreased catalytic activity, and then slowly reoxidizes.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 51 (1964), S. 321-321 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 91 (1986), S. 403-407 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We report an extraordinary depth range for Leptoseris fragilis (Milne Edwards and Haime), a reef building coral of the Red Sea living in cytosymbiosis with zooxanthellae. The coral harbours an as yet unknown pigment system. We suggest that the heterotrophic host — the coral — provides its photoautotrophic symbionts with additional light. The supplementary light is provided by host pigments which transform light of short wavelengths into suitable wavelengths for photosynthesis, thus amplifying and increasing the transfer of photoassimilates from the zooxanthellae to the host.
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