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  • 1
    Electronic Resource
    Electronic Resource
    Etude experimentale de la regulation endocrinienne de l'ovogenese chez Lithobius forficatus L. (Myriapode Chilopode). Role du complexe ''cellules neurosecretrices protocerebrales-glandes ceebrales''
    Amsterdam : Elsevier
    General and Comparative Endocrinology 28 (1976), S. 264-276 
    Details
    ISSN: 0016-6480
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0016-6480(76)90178-7
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Etude experimentale de la regulation endocrinienne de l'ovogenese chez Lithobius forficatus L. (Myriapode Chilopode). Role de la pars intercereralis
    Amsterdam : Elsevier
    General and Comparative Endocrinology 27 (1975), S. 34-42 
    Details
    ISSN: 0016-6480
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0016-6480(75)90050-7
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Etude cytochimique et ultrastructurale de l'ovogenèse chezLithobius forficatus L. (Myriapode Chilopode) Evolution des constituants cellulaires (1972)
    Springer
    Development genes and evolution 170 (1972), S. 115-134 
    Details
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'évolution ovocytaire présente les quatre phases classiques: préméiose, prévitellogenèse, vitellogenèse et maturation. Au cours de la prévitellogenèse, l'accroissement du noyau et du cytoplasme est très important. Le matériel nucléolaire se fragmente en de nombreuses masses et lames nueléolaires; les extrusions nucléaires sont très fréquentes. Le nombre de ribosomes et de mitochondries augmente considérablement et les mitochondries subissent de profondes modifications morphologiques: empilement, apparition de figures en nid d'abeilles. Les formations lysosomiales sont importantes. Durant la vitellogenèse, le noyau semble peu actif et les réserves vitellines s'accumulent dans le cytoplasme. Le nombre des ribosomes et des mitochondries diminue. Pendant la phase de maturation, l'appareil de Golgi semble sécréter des vacuoles périphériques, localisées dans le cytoplasme péricellulaire. Les modifications cytologiques et cytochimiques sont discutées et sont reliées à l'évolution physiologique ovocytaire.
    Notes: Summary The development of the oocyte takes place in four classical phases: premeiosis, previtellogenesis, vitellogenesis and maturation. During previtellogenesis, nucleus and cytoplasm grow considerably. The nucleolar material breaks up into numerous masses and laminae and nuclear extrusions are very frequent. The number of ribosomes and mitochondria increases markedly; the mitochondria show pronounced morphological modifications: stacking, honeycomb-like figures. Lysosomal formations are numerous. During vitellogenesis, the nucleus shows little activity and yolk accumulates in the cytoplasm. The number of ribosomes and mitochondria decreases. During maturation, the Golgi apparatus seems to bud off vacuoles in the cortical cytoplasm. Cytological and cytochemical modifications are discussed in relation to the physiological development of the oocyte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00577012
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Nature et origine des réserves vitellines dans l'ovocyte de Lithobius forficatus L. (Myriapode Chilopode) (1972)
    Springer
    Cell & tissue research 130 (1972), S. 18-27 
    Details
    ISSN: 1432-0878
    Keywords: Oocytes ; Chilopoda ; Vitellogenesis ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Dans l'ovocyte de Lithobius forficatus L., les trois types classiques de réserves vitellines apparaissent successivement: glycogène, globules lipidiques et vitellus protéique. La synthèse du glycogène semble effectuée au contact des membranes ergastoplasmiques. Les globules lipidiques paraissent élaborés à partir d'un matériel qui transite par le reticulum puis l'appareil de Golgi. Le vitellus protéique est d'origine exogène et pénètre dans l'ovocyte par pinocytose. L'ovocyte mûr est très riche en réserves vitellines et ne renferme qu'une mince couche cytoplasmique périphérique, pauvre en organites.
    Notes: Summary In the oocyte of Lithobius forficatus L., the three classical types of vitelline reserves appear successively: glycogen, lipid droplets, and protein yolk. Glycogen synthesis seems to occur in contact with the rough endoplasmic reticulum. Lipid droplets appear to be elaborated from a material which passes through the endoplasmic reticulum and the Golgi apparatus. Protein yolk originates elsewhere and enters the oocyte by pinocytosis. The mature oocyte is almost completely filled with yolk. There remains only a thin outer coat of cytoplasm with very few organelles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306992
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  • 5
    Electronic Resource
    Electronic Resource
    Etude ultrastructurale de la spermatogènese chezTrichinella spiralis Owen 1835 (Nématode trichuroïde) (1981)
    Springer
    Parasitology research 64 (1981), S. 207-215 
    Details
    ISSN: 1432-1955
    Keywords: Ultrastructure ; Spermatogenesis ; Nematoda ; Trichinella spiralis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'étude ultrastructurale de la spermatogénèse chezT. spiralis a permis de retrouver chez cette espèce les caractères morphologiques observés dans la lignée mâle chez la plupart des Nématodes, c'est-à-dire absence de flagelle chez le spermatozoïde, absence de reconstitution de l'enveloppe nucléaire après divisions méiotiques, structure atypique du centriole. Elle a permis de situer le spermatozoïde par rapport aux classifications antérieurement proposées.
    Notes: Abstract The ultrastructural study of spermatogenesis inT. spiralis demonstrated the main characteristics of the male germ cells in the class Nematoda, i.e. lack of flagella, lack of reconstitution of the nuclear envelope after the meiotic divisions, and atypical structure of the centriole. The spermatozoon ofT. spiralis was compared with previous classifications of the Nematoda spermatozoa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00930498
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    Paper (German National Licenses)
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  • 6
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    The Labrador Sea deep convection experiment (1998)
    AMS (American Meteorological Society)
    In:  Bulletin of the American Meteorological Society, 79 (10). pp. 2033-2058.
    Details
    Publication Date: 2016-09-07
    Description: In the autumn of 1996 the field component of an experiment designed to observe water mass transformation began in the Labrador Sea. Intense observations of ocean convection were taken in the following two winters. The purpose of the experiment was, by a combination of meteorological and oceanographic field observations, laboratory studies, theory, and modeling, to improve understanding of the convective process in the ocean and its representation in models. The dataset that has been gathered far exceeds previous efforts to observe the convective process anywhere in the ocean, both in its scope and range of techniques deployed. Combined with a comprehensive set of meteorological and air-sea flux measurements, it is giving unprecedented insights into the dynamics and thermodynamics of a closely coupled, semienclosed system known to have direct influence on the processes that control global climate.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/1520-0477(1998)079〈2033:TLSDCE〉2.0.CO;2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Arctic Ocean freshwater: How robust are model simulations? (2012)
    AMER GEOPHYSICAL UNION
    In:  EPIC3Journal of Geophysical Research-Oceans, AMER GEOPHYSICAL UNION, 117(C00D16), ISSN: 0148-0227
    Details
    Publication Date: 2016-11-29
    Description: The Arctic freshwater (FW) has been the focus of many modeling studies, due to the potential impact of Arctic FW on the deep water formation in the North Atlantic. A comparison of the hindcasts from ten ocean-sea ice models shows that the simulation of the Arctic FW budget is quite different in the investigated models. While they agree on the general sink and source terms of the Arctic FW budget, the long-term means as well as the variability of the FW export vary among models. The best model-to-model agreement is found for the interannual and seasonal variability of the solid FW export and the solid FW storage, which also agree well with observations. For the interannual and seasonal variability of the liquid FW export, the agreement among models is better for the Canadian Arctic Archipelago (CAA) than for Fram Strait. The reason for this is that models are more consistent in simulating volume flux anomalies than salinity anomalies and volume-flux anomalies dominate the liquid FW export variability in the CAA but not in Fram Strait. The seasonal cycle of the liquid FW export generally shows a better agreement among models than the interannual variability, and compared to observations the models capture the seasonality of the liquid FW export rather well. In order to improve future simulations of the Arctic FW budget, the simulation of the salinity field needs to be improved, so that model results on the variability of the liquid FW export and storage become more robust.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
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