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  • 1985-1989  (11)
  • 1975-1979  (23)
  • 1955-1959  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the 6p 2(3 P 0)n p Rydberg series of bismuth by multiphoton excitation (1985)
    Springer
    The European physical journal 320 (1985), S. 71-79 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Rydberg states of the odd-parity series 6p 2(3 p 0)n p of BiI are excited by a three-photon process. A two-photon dissociation of Bi2 into excited atomic states followed by a one-photon absorption leads to highly excited atomic Rydberg states up ton = 32. States of the even-parity Rydberg series 6p 2(3 p 0)nsJ=1/2,ndJ=3/2 andndJ=5/2 are also observed. In order to avoid the background caused by ionization of the bismuth molecules we performed a two-color excitation with pulsed dye lasers. With this experiment the 6p 2(3 p 0)npJ=3/2 Rydberg series could be resolved up ton=75. The increasing quantum defect of this series is due to a perturbing state close to the first ionization limit. By a MQDT analysis we obtain the energy of the perturbing state and a value of 58,761.68±0.1 cm−1 for the first ionization limit of atomic bismuth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411927
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  • 2
    Electronic Resource
    Electronic Resource
    Embryonic death in mouse due to lead exposure (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1312-1313 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Female mice which displayed a vaginal plug after mating were given a diet containing 0, 0.125, 0.250, 0.500% of lead as lead acetate and were dissected 16 to 18 days later. Lead treatment was found to reduce significantly the incidence of pregnancies and to increase the postimplantation loss in the pregnant females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01945798
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  • 3
    Electronic Resource
    Electronic Resource
    Increased ALA dehydratase activity and spleen weight in lead-intoxicated rats. A consequence of increased blood cell destruction (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 381-382 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Lead was given in the diet (1%) to rats from birth and at different times the animals were studied for delta amino levulinic acid dehydratase (ALAD) activity, spleen weight,59Fe incorporation in erythrocytes and51Cr-labeled erythrocytes survival. The increased ALAD and spleen weight found after lead treatment is explained as a consequence of a shortened survival, which results in a younger age of circulating erythrocytes with higher ALAD activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923048
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  • 4
    Electronic Resource
    Electronic Resource
    Biochemical studies in embryos after exposure of pregnant mice to dietary lead (1977)
    Springer
    Bulletin of environmental contamination and toxicology 18 (1977), S. 271-277 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01683418
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  • 5
    Electronic Resource
    Electronic Resource
    Plasma hormone levels in normal and lead-treated pregnant mice (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1375-1377 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Dietary lead (0.5%) was given to mice which, after mating, exhibited a vaginal plug. Estradiol, progesterone and prostaglandins E and F 2α were determined in, the plasma by radioimmuno assay at different times thereafter. The increase in estradiol and decrease in prostaglandins prior implantation are not greatly altered by lead treatment, whereas the subsequent increase in progesterone and later in estradiol is abolished. It is concluded that the lower number of pregnancies seen in lead-treated mothers is due to a maternal hormonal imbalance caused by lead.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01920190
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  • 6
    Electronic Resource
    Electronic Resource
    Die Funktionen des Skineffekts klassischer Nutenleiter in graphischer Darstellung (1975)
    Springer
    Electrical engineering 57 (1975), S. 127-131 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The equivalent circuits of standard slot conductors of electrical machines are given, their elements are described, and the mathematical functions, especially the combination of the Bessel and Hankel functions that occur in the elements, are represented graphically in the gauss-plane or in the conjugate gauss-plane, respectively. The curves confirm that in layered conductors the effect of the uppermost layer on the total impedance increases according to the size of its reduced conductor height.
    Notes: Übersicht Die Ersatzbilder üblicher Nutenleiter werden angegeben, ihre Glieder werden beschrieben und die mathematischen Funktionen, insbesondere die Kombinationen der in den Gliedern auftretenden Besselschen und Hankelschen Funktionen, werden in der Gaußschen Zahlenebene bzw. in der konjugierten Gaußschen Zahlenebene graphisch dargestellt. Die Kurvenzüge bestätigen, daß bei geschichteten Leitern der Einfluß der obersten Schicht auf die Gesamtimpedanz um so größer wird, je größer dessen reduzierte Leiterhöhe ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573789
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  • 7
    Electronic Resource
    Electronic Resource
    Are development and growth of pea aphids, Acyrthosiphon pisum, in North America adapted to local temperatures? (1987)
    Springer
    Oecologia 72 (1987), S. 170-177 
    Details
    ISSN: 1432-1939
    Keywords: Developmental rate ; Adult weight ; Adaptation ; Temperature ; Acyrthosiphon pisum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Developmental rate and adult weight were studied at constant temperatures from 9.8 to 27.9°C for 18 clones from each of five populations of the pea aphid, Acyrthosiphon pisum (Harris), from locations between 39 and 53°N latitude in central North America. The response of developmental rate to temperature for each clone was accurately described by a three parameter non-linear equation. Adult weight usually decreased with increasing rearing temperature, but the shape of the response to temperature varied among clones. Variation in the developmental parameters was greater among clones within populations than among populations. No consistent trends were observed in the developmental parameters or adult weights either with latitude or the long term average temperatures at the locations. We conclude that previously reported geographic variation in the developmental threshold of this species, which was attributed to local adaptation, occurred either because the clones tested were not representative of the populations or because rearing methods differed among studies. The results are discussed in relation to the hypothesis that life history traits which are temperature sensitive are adapted to local thermal environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379263
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  • 8
    Electronic Resource
    Electronic Resource
    Absorption of different amino acids by an intestinal preparation from normal rats and from rats exposed to supralethal X-Irradiation (1977)
    Springer
    Radiation and environmental biophysics 14 (1977), S. 53-60 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary Absorption of different amino acids [lysine,α-amino isobutyrate (AIB), methionine, alanine, glycine] was studied in an intestinal in vivo preparation from normal and X-irradiated rats (1 and 3 days after 2000 R). Absorption of amino acids under loading and in presence of other amino acids was also followed. Lysine and AIB absorption follow a saturation kinetics with a maximal velocity of 35 and 85.6 µmoles/min and aK t of 10 and 67 µmoles for lysine and AIB respectively. Interference in absorption exists not only between amino acids of the same class, but also by lysine on neutral amino acids. One day after irradiation, absorption is normal or even enhanced, although active transport appears impaired as indicated by the increase inK t. Three days after exposure, absorption, particularly the active one, is severely depressed. This is indicated by the low Vm and highK t, as well as by the fact that loading has little influence on absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01331030
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  • 9
    Electronic Resource
    Electronic Resource
    Renal function and intra/extravascular distribution spaces in the rat after supralethal whole-body X-irradiation (1975)
    Springer
    Radiation and environmental biophysics 12 (1975), S. 291-302 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary Renal function and distribution of51Cr-EDTA in intra/extravascular space has been studied in rats suffering from the gastro-intestinal syndrome after supralethal doses of X-irradiation. Urine excretion and glomerular filtration were found to decrease until 50 hrp.i. Urine excretion and, in a less degree, glomerular filtration rate increase then to a peak at 67 hrs before falling off to zero values before death. The extravascular space was found to be expanded in several organs from 60 hrs on (kidney, liver, stomach, intestine). Only in kidney where weight follows changes in extravascular space, a return to normal values is seen before death. An expansion in extravascular space due to a reduced re-extraction into intravascular space and diminished excretion constant can also be discerned beginning early after exposure on the basis of compartmental analysis of the blood activity-time curves. It is postulated that the changes observed reflect a state of shock developing slowly after irradiation and entering its irreversible stage 60 to 65 hrs after exposure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323417
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  • 10
    Electronic Resource
    Electronic Resource
    Regional blood flow in rats exposed to supralethal doses of whole body X-irradiation (1975)
    Springer
    Radiation and environmental biophysics 12 (1975), S. 303-313 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary Relative blood flow in different organs of the supralethally (3 kR) whole body X-irradiated rat was studied using labeled 15 µ microspheres. Immediately after irradiation blood flow in brain diminishes. From 10 to 20 hrs a phase of increase in blood flowing to many parenchymal organs ensues. A second maximum 45 to 50 hrs and a third one at 60 hrs. In most organs except in brain and liver relative blood flow diminishes before death. The genesis of these changes as signs of a slowly developing shock is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323418
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