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  • 1
    ISSN: 1432-0878
    Keywords: Sensilla ; Olfaction ; Dictyoptera (insect) ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les organes sensoriels du scape et du pédicelle sont essentiellement propriocepteurs. Le fouet est très riche en chimiorécepteurs (plus de 100000) mais chez Periplaneta et Blatta, on observe un net dimorphisme sexuel qui n'existe pas chez Blaberus. La relation entre un tel dimorphisme et la perception des phéromones sexuelles est discutée. L'ultrastructure des trois principaux types de sensilles est décrite: Ce sont des grandes soies gustatives et mécanoréceptrices, des petites soies olfactives à paroi mince et percée de pores et de tubules qui sont innervées par un ou deux neurones, des petites soies olfactives à paroi épaisse et striée qui contiennent toujours quatre neurones. L'étude électrophysiologique préliminaire confirme les résultats ci dessus en ce qui concerne le rôle des sensilles: La phéromone grégaire peut être perçue au niveau de certaines petites soies olfactives striées.
    Notes: Summary The antennae of cockroaches were studied with both scanning and transmission electron microscope. The sense organs of the scape and pedicel are essentially proprioceptors. The chemoreceptors are very numerous on the flagellum (more than 100000) but in the case of Periplaneta and Blatta, a significant sexuel dimorphism is noticed. Such a dimorphism does not exist in Blaberus and its relation with the perception of the sexual attractants is discussed. Three principal sense organs of Blaberus are described: big thick walled hairs with gustatory and mechanoreceptive function; thin walled olfactory hairs with pore-tubules innervated by one or two neurons; thick walled grooved hairs with four neurons and olfactory function. Special attention was given to the secretory aspect of the accessory cells in the olfactory sensilla. A preliminary electrophysiological investigation confirms the above mentioned functional interpretations. The gregarious pheromone seems to be perceived by some little thick walled grooved hairs.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 143 (1973), S. 367-385 
    ISSN: 1432-0878
    Keywords: Pineal ; Hedgehog ; Sexual cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les pinéalocytes (au sens strict: Wolfe, 1965) de l'épiphyse du Hérisson mâle, examinés au microscope électronique, ont été comparés à ceux d'autres Mammifères. Ils possèdent un ou plusieurs prolongements cellulaires, dont la terminaison en «massue» est caractéristique. A l'intérieur du noyau, un nucléole de forme alvéolaire facilite l'identification de ce type cellulaire. Dans le périkaryon, des mitochondries, des ribosomes, quelques lysosomes. et inclusions lipidiques sont présents. Des cils et de rares «rubans circonscrits par des vésicules» (Collin, 1969) sont observés. Le réticulum endoplasmique est peu abondant et est constitué, essentiellement, par la forme lisse. L'appareil de Golgi sécrét de petites vésicules claires de 300 à 450 Å de diamètre et des vésicules à coeur dense de 400 à 1500 Å de diamètre. La migration de ces grains vers l'extrémité des prolongements a été mise en évidence. Pendant les phases du cycle sexuel, on observe une évolution de certains éléments des pinéalocytes. D'une part, pendant la phase de mise au repos sexuel, il y a formation, à partir du réticulum, d'un système rectiligne composé de cavités et de vésicules, puis évolution de l'ensemble vers une forme lamellaire concentrique, D'autre part, on note l'apparition de «condensations cytoplasmiques» très importantes durant une partie de la phase de pleine activité sexuelle.
    Notes: Summary The pinealocytes of the male hedgehog have been examined with the electron microscope, and have been compared with those of other mammals. They possess one or more cytoplasmic processes which end in a terminal club. In the nucleus, an alveolar nucleolus facilitates the identification of this cellular type. In the perikaryon, mitochondria, ribosomes, lysosomes and lipid inclusions are present. Cilia and rare “rubans circonscrits par des vésicules” (Collin, 1969) are observed. The endoplasmic reticulum is not very abundant and essentially consists of the smooth type. Small clear vesicles (350–450 Å) and dense-cored vesicles (400–1500 Å) are produced by the Golgi apparatus. The migration of these densecored vesicles towards the terminal processes has been observed. It has been shown that there occurs a change of some cytoplasmic structures during the sexual cycle of this animal. On the one hand, during the period of sexual quiescence, a reticular formation—composed of lamellae and vesicles—is observed in the cytoplasm. This formation is transformed into annular lamellae. On the other hand, during the period of maximal sexual activity, just after the first mating period, numerous “cytoplasmic condensations” are observed.
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  • 3
    ISSN: 1573-6709
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Sectorization, which began as “a glorious underground movement,” is now official French policy-and so, inevitably, some of the romance and intense dedication has faded. Despite budget cuts for personnel, programs, and new construction, an administrative structure has been created to provide an adequate standard of community mental health for the French people.
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  • 4
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A variable sensitivity technique using the projection of a fringe pattern is demonstrated for mapping deformations, vibrations, contour lines and differences between two objects. The method does not require laser illumination and gives an opportunity for studying large objects with incoherent light, and is compared with other techniques such as holography or speckle. The limitations likely to be encountered in industrial environments are discussed. The realization and incoherent projection of gratings is also discussed.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 12 (1973), S. 563-566 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Metrika 20 (1973), S. 148-155 
    ISSN: 1435-926X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Let (X, ) be a measurable space, Θ⊂∔ an open interval,P ϑ| , ϑ∈Θ, a family of probability measures, and ϑ n , n∈ℕ a sequence of minimum contrast estimates.Pfanzagl [1971] shows that — under certain regularity conditions — for every ϑ∈Θ there exists a constantc ϑ such that for alln∈ℕt∈∔, $$|p_\vartheta ^n \left\{ {x \in X^n :n^{1/2} \frac{{\vartheta _n (x) - \vartheta }}{{\beta (\vartheta )}}〈 t} \right\} - \frac{1}{{\sqrt {2\pi } }}\int\limits_{ - \infty }^t {\exp } \left[ {\frac{1}{2}r^2 } \right]dr| \leqq c_\vartheta n^{ - 1/2} .$$ Pfanzagl's proof uses compactness arguments and yields therefore only the existence ofc ϑ, but gives no method to determine its value. In this paper we shall show howc ϑ can be estimated. This is done under an additional condition which, in the case of maximum likelihood estimates, reduces to the condition that the likelihood equation has one solution only.
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  • 7
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Wir beschreiben eine Familie mit mehreren dismorphischen und geistig zurückgebliebenen Kindern. Giemsafärbung des Karyotyps ergab beim Vater eine perizentrische Inversion des Chromosoms Nr. 5. Das erklärt durch “aneusomie de recombinaison” die Geburt eines Kindes mit “cri du chat” Syndrom und eines zweiten Kindes mit dem Syndrom “contre-type”.
    Notes: Summary We report the case of a family with several dysmorphic and mentally retarded children. Giemsa banding showed a pericentric inversion of chromosome No. 5 in the father. This rearrangement can explain the birth of one child with typical and another with atypical cat-cry syndrome as due to recombination aneusomy.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Inventiones mathematicae 21 (1973), S. 287-301 
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
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  • 9
    ISSN: 1432-2234
    Keywords: Choloroethylenes ; CNDO/S method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract CNDO/S method has been employed to evaluate different physical observables in chloroethylenic compounds: dipolar moments, transition energies in u.v. region and C-13 N.M.R. chemical shifts. Introduction of d orbitals in the basis improve the computed values, and the CNDO/S method appears to be better than CNDO/2 to evaluate these physical constants.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 342 (1973), S. 177-183 
    ISSN: 1432-2013
    Keywords: Citrate Excretion ; Kidney Excretion of Citrate ; Organic Acid Excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Clearance measurements were made in 15 dogs in order to study the urinary citrate excretion. The citrate determination is performed in blood plasma and urine, with an enzymatic specific method. The authors find that more than 99% of the citrate filtered through the glomerulus is reabsorbed. The greater sensitivity, specificity and accuracy of the enzymatic method, which has been compared with the usual chemical methods, may explain the discrepancy between these data and the results published by other authors. These results are consistent with the hypothesis that citrate is filtered, reabsorbed and not secreted by the tubule in the dog.
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