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  • 1
    Electronic Resource
    Electronic Resource
    Les phases précoces de la formation des cils et le problème de l'origine du corpuscule basal (1968)
    Springer
    Cell & tissue research 87 (1968), S. 46-68 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Developing cilia and non-ciliated centrioles are both present in the rat choroid cell studied with the electron microscope. The development of the cilium begins with the appearance of a thick-walled vesicle close to the centriole or in contact with it. Very soon this vesicle lines the distal extremity of the centriole. The growing ciliary shaft invaginates the vesicle, forming a temporary ciliary sheath. This sheath isolates the growing cilium from its environment. Degenerating ciliary shafts are by no means rare. They are interpreted as evidence of a biological cycle of the cilia. Club-shaped forms are also frequent. Non-ciliated centrioles are sometimes in contact with striated structures consisting of alternating dark and light bands, separated by a distance of 600 Å. These formations (treillis) are different from the “pericentriolar satellites”. On morphological grounds, they might be considered as centriole precursors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326560
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  • 2
    Electronic Resource
    Electronic Resource
    A note on the derivation of the stevens power law (1967)
    Springer
    Bulletin of mathematical biology 29 (1967), S. 827-829 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Previous derivations of the Stevens Power Law relating loudness to intensity assume, in addition to level invariance, that the relation must be analytic or at least differentiable. This last condition is replaced here by the weaker one of requiring only continuity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02476930
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  • 3
    Electronic Resource
    Electronic Resource
    Biological similarity relative to allometric quantities (1965)
    Springer
    Bulletin of mathematical biology 27 (1965), S. 131-133 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract It is an empirical finding that an allometric quantity with dimensional exponents α, β and γ relative to mass, length, and time, respectively, has a value for its allometric exponentb satisfying the relation $$\tfrac{1}{3}(3\alpha + \beta + {\gamma \mathord{\left/ {\vphantom {\gamma 2}} \right. \kern-\nulldelimiterspace} 2}) \leqslant b \leqslant \tfrac{1}{3}(3\alpha + \beta + \gamma ).$$ A theoretical derivation is given of this double inequality using only the fact of constant density and the plausible assumption that metabolic rate is a dominant allometric quantity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02477269
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  • 4
    Electronic Resource
    Electronic Resource
    On the derivation of a mean growth equation for cell cultures (1966)
    Springer
    Bulletin of mathematical biology 28 (1966), S. 411-416 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract IfN(t) is the expected number of cells in a culture at timet, $$\dot N(t)$$ the corresponding time derivative, andf(t−τ)dt the probability that a cell of aget−τ at timet will divide in the succeeding time intervaldt, then according to Hirsch and Engelberg (this issue) there obtains the integral equation $$\dot N(t) = 2\int_{ - \infty }^t {f(t - \tau )\dot N(\tau )d\tau }$$ for describing the dynamics of the cell population. It is the purpose of this note to give two alternative derivations of this equation, one based on the age density equation of Von Foerster, and the other based on a generalized form of the Harris-Bellman equation describing the first moment of an age dependent, branching process. In addition, a probability model is posed from which the Von Foerster equation and, hence, the Hirsch-Engelberg equation readily follows.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02476822
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  • 5
    Electronic Resource
    Electronic Resource
    Role of the liver in systemic pyridine nucleotide metabolism (1968)
    Springer
    Naturwissenschaften 55 (1968), S. 231-232 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00606222
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  • 6
    Electronic Resource
    Electronic Resource
    Hydroxydithionates and hydroxythiosulphates of zinc (1966)
    Springer
    Colloid & polymer science 210 (1966), S. 79-80 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01500438
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  • 7
    Electronic Resource
    Electronic Resource
    Cambios Químicos y Fisiológicos en Hongos Filamentosos Durante la Autólisis (1969)
    Springer
    Mycopathologia 38 (1969), S. 199-207 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Summary The induced autolysis ofAspergillus flavus mycelium was studied. Mycelium ofA. flavus was obtained by growing this fungus in submerged cultures with aeration and mechanical agitation in fermentors at 24° C–25° C for 6 days. At that time culture fluid was discarded and the mycelium throughout washed in sterile conditions and suspended in distilled water. The induced autolysis ofAspergillus flavus mycelium was provoked by subjecting this suspension to a combined action of a flow of air (4 l/min) and mechanical agitation (150 rev/min) for a variable length of time. In these conditions a degree of autolysis amounting to 73 %–79 % has been obtained. Estimation of ammonia evolved during this induced autolysis ofAspergillus flavus gave maximum values (10 mg/24 h/l of suspension) at the beginning of the process, that is, by the 4th–8th days of autolysis, decreasing sharply thereafter. From the 30th day on the amount of NH3 given off remained fairly constant around the value 1 mg/24 h/l of suspension.
    Notes: Resumen En la presente comunicación se estudia la autólisis inducida del micelio delAspergillus flavus. Se cultivó elA. flavus durante 6 dias en el medio de Raulin-Thom con aireación y agitación mecánica en fermentador a 24°–25°. Transcurrido este tiempo se lavó el micelio obtenido con agua en condiciones estériles hasta dejarlo exento de las últimas porciones de líquido de cultivo, prescindiendo de estas aguas de lavado. Finalmente se añadió un volumen de agua destilada estéril igual al de líquido de cultivo que había durante el crecimiento, al principio de la experiencia. La suspensión resultante se autolizó frente a agua sometiendola a la acción conjunta de un flujo de aire (4 l/min) y agitación mecánica (150 rev/min) igual que durante la fase de crecimiento. En esta autólisis inducida se obtuvo una pérdida de peso del micelio que ascendía a un 73 – 79%. El amoníaco desprendido durante la autólisis se determinaba diariamente, obteniéndose valores máximos que llegaron a 10 mg NH3/24 h/l de suspensión, durante el comienzo del proceso, esto es, entre el 40 y 80 dia de autólisis, seguidos de una brusca disminución para finalmente permanecer constante alrededor del valor 1 mg/24 h/l de suspensión a partir de los 30 dias de autólisis en adelante.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02051692
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  • 8
    Electronic Resource
    Electronic Resource
    Identification of manganese(II) ions with p-aminophenylmercapto acetic acid (1969)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 247 (1969), S. 53-55 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00676504
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  • 9
    Electronic Resource
    Electronic Resource
    Las comunidades de los ventisqueros (Salicetea herbaceae) del Pirineo central (1969)
    Springer
    Plant ecology 17 (1969), S. 232-250 
    Details
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary A study is made on plant communities of stands that remain covered with snow almost all the year (Salicetea herbaceae) in the Central Pyrenes Mountains; they are compared with those of the Oriental Pyrenees and Occidental Alps. The author publishes 36 original relevées of 3 associations: Cardamino-Gnaphalietum supini, Anthelio-Salicetum herbaceae and Carici-Salicetum retusae. A floristical, ecological and chorological study of them is made. The phenomena of soils and vegetation zonation in the alpine range are emphasized.
    Abstract: Zusammenfassung Untersuchung der Schneetälchengesellschaften der zentralen Pyrenäen (Salicetea herbaceae) und Vergleich mit denen der Ostpyrenäen und der Westalpen. Die Arbeit beinhaltet 36 unveröffentlichte Aufnahmen, die in drei Ass. gegliedert werden: Cardamino-Gnaphalietum supini, Anthelio-Salicetum herbaceae und Carici-Salicetum retusae, die floristisch, ökologisch und chorologisch beschrieben werden. Besondere Aufmerksamkeit wird der Abstufung der Bodentypen und der alpinen Vegetation gewidmet.
    Notes: Resumen Se hace un estudio de las comunidades de los ventisqueros del Pirineo Central (Salicetea herbaceae) y se las compara con las de los Pirineos Orientales y Alpes Occidentales. El autor publica 36 inventarios originales correspondientes a tres asociaciones: Cardamino-Gnaphalietum supini, Anthelio-Salicetum herbaceae y Carici-Salicetum retusae, de las que hace un estudio florístico, ecológico y corológico. Los fenómenos de zonación de los suelos y de la vegetación del piso alpino, son destacados.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01965912
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  • 10
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    Identification of manganese(II) ions with p-aminophenylmercapto acetic acid (1969)
    Springer
    Details
    Publication Date: 1969-01-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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