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  • 1
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The loud and elaborate songs of male songbirds are throught to serve in territorial defense and to stimulate reproductive behavior in the female. We report here that in contrast to several other species, song alone is inadequate to induce sexual (lordosis) behavior in female indigo and lazuli buntings (Passerina cyanea and P. amoena); they require a more elaborate stimulus configuration to develop the full expression of sexual receptivity as indicated by a stereotyped copulation solicitation display. A live male must be present near the female, singing must ensue, and in addition a second and unique vocal utterance must be heard by the female; this is a soft buzzy-sounding vocalization, audible for no more than a few meters, not recognized previously as a critical arousal signal of the male songbird repertoire. Females also utter similar soft sounds in an intimate vocal exchange with the male leading to solicitation of copulation.
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  • 2
    ISSN: 1615-6102
    Keywords: Proto-oncogene product Bcl-2 ; Calcium ; Mitochondria ; Plasma membrane NADH oxidoreductase ; Transcription factor NF-κB
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We discuss the involvement of several mammalian redox systems in the regulation of apoptosis. We focus especially on the role that mitochondria and the still ill-characterized plasma membrane NADH-oxidoreductase system play in apoptosis. The latter system was shown to respond to downregulation of mitochondrial function; inhibition of either system induces apoptosis. Apoptosis induced by inhibitors of the oxidase involves both Bcl-2 and calcineurin, two proteins recently shown to be capable of forming a tight complex. We suggest that Bcl-2 acts as an antioxidant, but in an electron sense rather than in an oxygen sense.
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  • 3
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract 25 new K-Ar data are presented for Upper Cenozoic andesites and ignimbrites from the Andes of north Chile between 20° 30′ S and 22° 30′ S. The original simple volcanic stratigraphy of andesites overlying ignimbrites has been refined. A more complicated stratigraphy, with some andesites predating the ignimbrites, is described. The sequence and timing of volcanic events differ along the length of the north Chilean Andes. Ages of the earliest widespread ignimbrite eruptions range from 21 m. y. to 10 m. y., in different segments of the volcanic chain. The existence of two large acid extrusives of Quaternary age suggests that generation of acid magmas has continued until recently.
    Abstract: Résumé On présente 25 valeurs nouvelles sur l'âge radiométrique des andésites et des ignimbrites du Cénozoïque supérieur des Andes du nord du Chili entre les latitudes 20° 30′ et 22° 30′ S. L'ancienne stratigraphie simplifiée où les andésites surmontent les ignimbrites a été révisée, et remplacée par une stratigraphie plus compliquée où quelques andéseites précèdent les ignimbrites. La succession et la chronologie des éruptions volcaniques diffèrent le long des Andes du nord du Chili. Dans les différentes parties de la chaîne volcanique, l'âge des premières grandes eruptions d'ignimbrites varie entre 21 et 10 M. a. La présence de deux grandes coulées acides d'âge quaternaire permet de supposer que des magmas acides continuent à se former.
    Notes: Zusammenfassung 25 neue K-Ar-Daten von känozoischen Andesiten und Ignimbriten der nordchilenischen Anden zwischen 20° 30′ S und 22° 30′ S werden vorgestellt. Die ursprünglich einfache Stratigraphie — Andesite überlagern Ignimbrite — wurde verfeinert, und eine komplexere Stratigraphie, bei der einige Andesite älter sind als die Ignimbrite, wird beschrieben. Die Reihenfolge und der zeitliche Ablauf vulkanischer Tätigkeit sind in den nordchilenischen Anden komplex. Die ältesten ausgedehnten Ignimbritdecken reichen in den verschiedenen Abschnitten der Vulkanzone von 21 bis 10 Mio. Jahre. Das Vorhandensein von zwei großen sauren quartären Extrusionszyklen läßt vermuten, daß die Bildung von sauren Magmen bis in die Gegenwart andauerte.
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  • 4
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production ofK 0, Λ and $$\bar \Lambda $$ particles is studied in the E665 muon-nucleon experiment at Fermilab. The average multiplicities and squared transverse momenta are measured as a function ofx F andW 2. Most features of the data can be well described by the Lund model. Within this model, the data on the K0/π± ratios and on the averageK 0 multiplicity in the forward region favor a strangeness suppression factors/u in the fragmentation process near 0.20. Clear evidence for QCD effects is seen in the average squared transverse momentum ofK 0 and Λ particles.
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  • 5
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production of charged hadrons is studied in μXe and μD interactions at 490 GeV beam energy. The data were taken at the Tevatron at Fermilab with the E665 spectrometer, equipped with a streamer chamber as vertex detector. Differences between the μXe and μD data are explained by cascading of hadrons in the Xe nucleus. The average multiplicity of charged hadrons in μXe scattering is compared to previously published pXe scattering data and is found to be strongly reduced. This is traced back to the low number of ‘projectile’ collisions in μXe interactions. From a study of thex Bj dependence of hadron production in μXe scattering, and by considering events with a large rapidity gap, evidence is found for a significant contribution of diffractive scattering, which is enhanced in the kinematic region where shadowing of the cross section is observed. This result supports recent models in which diffractive scattering and nuclear shadowing are closely related.
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  • 6
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Falcaustra mackini (Walton, 1941) is redescribed. The anterior extremity is shown to be supported by three cordons arising from between the lips; the two subdorsal cordons are always curved on to the dorsal lip, whereas the ventral cordon curves on to either the right or left subventral lip. This cephalic morphology differs markedly from Falcaustra sensu stricto. F. mackini is designated type of Cordonema n. g. (Kathlaniinae). Cordonema cryptobranchi (Walton, 1930) n. comb. and C. variabilis (Walton, 1941) n. comb., both occurring in Cryptobranchus allegheniensis, the host for C. mackini, are included in the new genus. ac]19801207
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Systematic parasitology 9 (1987), S. 199-201 
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Rhabdias collaris n. sp. (Rhabditoidea: Rhabdiasidae) is described from Leptopelis vermiculatus (Boulenger, 1909) (Hyperoliidae: Leptopelinae) (type host) and Hyperolius sp. (Hyperoliinae) of Amani, Tanzania. This species differs from all others in the genus in possessing a cephalic end which is markedly thickened by four peripheral muscle bundles. The muscular mass extends anteriorly forming a concave depression at the base of which the mouth is located.
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  • 8
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Entomelas entomelas (Dujardin, 1845) Travassos, 1930, the type species of Entomelas, is redescribed based on specimens from Anguis fragilis and Ophisaurus apodus. The generic diagnosis is emended. E. dujardini (Maupas, 1916) Travassos, 1930, Paraentomelas kazachstanika (Sharpilo & Vakker, 1972) Sharpilo, 1976 and Hexadontophorus ophisauri Kreis, 1939 are synonymized with E. entomelas and the genera Paraentomelas and Hexadontophorus fall as synonyms of Entomelas. Kurilonema Szczerbak & Sharpilo, 1969 is synonymized with Entomelas and the type species, K. markovi, is reclassified as Entomelas markovi (Szczerbak & Sharpilo, 1969) n. comb. Entomelas cruszi n. sp. is described from agamid lizards of Sri Lanka. The genera in the Rhabdiasidae are reviewed and a key is provided. Ophiorhabdias Yamaguti, 1943 and Shorttia Singh & Ratnamala, 1977 are designated synonyms of Rhabdias Stiles & Hassall, 1905. ac]19790201
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  • 9
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Aplectana gigantica Olsen, 1938 and Oxysomatium inglisi Anderson, 1964 (Cosmocercidae) have been re-examined. Study of cephalic, oesophageal and male caudal structures and of the egg demonstrates that both species belong in the Kathlaniidae and they are reclassified as Falcaustra inglisi (Anderson, 1964) n. comb. and Megalobatrachonema gigantica (Olsen, 1938) n. comb. The genus Megalobatrachonema Yamaguti, 1941 is divided into M. (Megalobatrachonema) n. subg. (with M. nipponica Yamaguti, 1941 and M. gigantica) and M. (Chabaudgolvania) n. subg. (with M. campanae Chabaud & Golvan, 1959 and M. terdentatum (Linstow, 1898)). M. (Chabaudgolvania) lacks oesophageal valves which are present in M. (Megalobatrachonema). It is suggested that F. inglisi and M. gigantica illustrate a trend in the evolution of the Kathlaniinae towards reduction of cephalic support structures and simplification of the oesophagus to a club-shaped form lacking valves. An evolutionary hypothesis linking the Kathlaniinae to the Quimperiidae (Seuratoidea) is presented. The genus Chabaudinema Díaz-Ungría, 1968 is synonymized with Spectatus Travassos, 1923 and its type species is designated Spectatus americana (Díaz-Ungría, 1968) n. comb. ac]19791109
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  • 10
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Spinicauda voltaensis n.sp. is described from a toad, Bufo sp., from Upper Volta, Africa. It differs from other Spinicauda spp. in the number, distribution and size of caudal papillae in males, in the lack of a gubernaculum, and in the possession of markedly elongate spicules and a relatively short male tail. S. mathevossianae Skarbilovich, 1950, is probably a synonym of Aplectana acuminata (Schrank, 1788) (Cosmocercidae). S. komodoensis Pinnell & Schmidt, 1977, is transferred to Moaciria.
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