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  • Articles  (222)
  • Springer  (200)
  • American Physical Society  (12)
  • Nature Publishing Group  (10)
  • 1980-1984  (61)
  • 1970-1974  (46)
  • 1930-1934  (15)
  • 1925-1929  (100)
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  • Articles  (222)
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  • 1
    Electronic Resource
    Electronic Resource
    Light-dependent synthesis of cholecalciferol in a green plant (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 68-69 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For the present studies, T. flavescens and other grasses were sown in a dark room in wooden frames containing finely sieved soil and covered by cubic tents of aluminium foil to exclude all radiation from the outside. Inside, Grolux lamps of 30 W each were placed 60cm above the soil surface. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/283068a0
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  • 2
    Electronic Resource
    Electronic Resource
    Internal origin for lunar rilled craters and the maria? (1974)
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 573-575 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Evidence for lunar vertical crustal movement is provided by Apollo 15 photographs of dipping structures on Silver Spur (25 40' N, 3 58' E)8 and by craters containing rilles indicating either uplift9 or subsidence10. Principal lineaments such as rilles and faults, and craters larger than 10 km ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/248573a0
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular Oxygen Absorption of Solar Lyman-α observed by Interkosmos-1 (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 1298-1298 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Theoretical curves of optical thickness at grazing incidence were calculated from the O2 and N2 densities given by the CIRA 1965 model atmosphere, which are nearly equal to the mean values between the summer and winter models of the US Standard Atmosphere Supplement 1966. Absorption cross-sections ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2281298a0
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  • 4
    Electronic Resource
    Electronic Resource
    Proposed New Unit of Frequency (1970)
    [s.l.] : Nature Publishing Group
    Nature 225 (1970), S. 394-395 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR,-I propose the establishment of a new intermediate unit of frequency?pitts. The pitts equals "pulses per second", "nerve pulses per second" or "spikes per second", all relatively clumsy terms used indeterminantly by neurophysiologists, brain research workers and others. The proposed new unit ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/225394b0
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  • 5
    Electronic Resource
    Electronic Resource
    Polarisierte und gerichtete Röntgenstrahlung aus einem Kristall. (1930)
    [s.l.] : Nature Publishing Group
    Nature 125 (1930), S. 745-745 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURCH mehrere experimentelle Untersuchungen habe ich festgestellt, (fass die Atome der Elemente Wasserstoff und Helium eine ausgezeichnete Achse besitzen, in Bezug auf welche die Gleichgewichtslagen ihrer Elektronen angeordnet sind. Auf Grund spektraler Analogie kann man folgern, dass auch bei ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/125745b0
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  • 6
    Electronic Resource
    Electronic Resource
    Biological optimality: Comparison of generalized feasibility and optimality conditions for linear, error-minimizing systems (1982)
    Springer
    Bulletin of mathematical biology 44 (1982), S. 777-791 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract An attempt is made to compare the conditions for the general error-optimality of linear systems developed by Kalman with the conditions for feasibility of linear models of neuromuscular and physiological control systems. Models of three actual physiological systems are tested for both the above criteria. Theoretical analysis presented here shows that there are no simple relationships between the two sets of conditions. Analysis carried out on the physiological systems models suggests the need for a general set of conditions for other optimality criteria, such as time and energy minimization, similar to Kalman's condition for error minimization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02465180
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  • 7
    Electronic Resource
    Electronic Resource
    A cofferdam design optimization (1972)
    Springer
    Mathematical programming 3 (1972), S. 263-275 
    Details
    ISSN: 1436-4646
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The design of circular type cellular cofferdams is formulated as a nonlinear optimization model that takes explicit account of relevant economic and technologic aspects. The objective is minimization of total expected cost. The constraints arise from stability critera to protect against failures due to slipping of the sheet piles on the river side and interlock stresses at the joint. A solution achieved with geometric programming techniques, yields optimal cell sizes and design heights. The geometric programming approach provides important design insights by yielding the proportions of the total cost to be assigned to the cost components, fill material, sheet piling and flooding in an optimal design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01585000
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  • 8
    Electronic Resource
    Electronic Resource
    Photoreceptor properties of an ectopic eye in the fleshfly,Sarcophaga bullata (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 993-994 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ectopic eyes were produced on the fleshfly,Sarcophaga bullata by transplantation of imaginal eye discs. Electrophysiological and histological observations of these supernumerary eyes indicate the absence of synaptic connections between retinular cells and higher order neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01953841
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  • 9
    Electronic Resource
    Electronic Resource
    Development of visual sensitivity in the fly,Sarcophaga bullata (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 1318-1319 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ontogeny of light response in the compound eyes of the fly,Sarcophaga bullata was investigated. Even though the eyes are structurally differentiated before eclosion they become electrophysiologically functional only after eclosion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990392
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  • 10
    Electronic Resource
    Electronic Resource
    Information and evolution (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 1307-1308 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Les auteurs discutent la formulation quantitative de l'évolution comme un procès qui augmente le contenu de l'entité thermodynamique d'information dans la biosphère.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935133
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