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  • Drosophila  (2)
  • Isolated brainstem  (2)
  • Springer  (4)
  • 1995-1999  (4)
  • 1960-1964
  • 1940-1944
  • 1935-1939
  • 1920-1924
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  • Springer  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Fictive respiratory rhythm in the isolated brainstem of frogs (1995)
    Springer
    Journal of comparative physiology 176 (1995), S. 703-713 
    Details
    ISSN: 1432-1351
    Keywords: Neural control of breathing ; Amphibian ; Isolated brainstem ; Respiration Pattern generation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Spontaneous rhythmically bursting activity was recorded from the trigeminal, vagal and hypoglossal nerve roots of the isolated brainstem from the frogsRana catesbeiana andRana pipiens superfused with a bicarbonate-free HEPES-buffer solution. Burst frequency, burst duration and the activity profile of the spontaneous neural discharges in vitro resembled those of a less radical preparation, the decerebrate, fictively breathing frog. After complete midsagittal section, each half of the isolated brainstem generated its own rhythmic neural activity which resembled that of the intact isolated brainstem. The spontaneous activity generated within each half of the brainstem is probably coordinated by decussating axons or by groups of neurons located along the midline of the brainstem. Our results suggest that these coordinating entities extend the length of the brainstem (in a rostro-caudal dimension) and the degree of contact rather than the location of the contact between the two halves of the brainstem determines the synchronization of the right and left halves. Burst frequency of both the intact and hemisected brainstem preparation was decreased by alkaline challenge and increased by acid challenge. We conclude that this endogeneous rhythmic activity represents the efferent motor output underlying lung ventilation in these animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021590
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  • 2
    Electronic Resource
    Electronic Resource
    Fictive respiratory rhythm in the isolated brainstem of frogs (1995)
    Springer
    Journal of comparative physiology 176 (1995), S. 703-713 
    Details
    ISSN: 1432-1351
    Keywords: Neural control of breathing ; Amphibian ; Isolated brainstem ; Respiration Pattern generation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Spontaneous rhythmically bursting activity was recorded from the trigeminal, vagal and hypoglossal nerve roots of the isolated brainstem from the frogs Rana catesbeiana and Rana pipiens superfused with a bicarbonate-free HEPES-buffer solution. Burst frequency, burst duration and the activity profile of the spontaneous neural discharges in vitro resembled those of a less radical preparation, the decerebrate, fictively breathing frog. After complete midsagittal section, each half of the isolated brainstem generated its own rhythmic neural activity which resembled that of the intact isolated brainstem. The spontaneous activity generated within each half of the brainstem is probably coordinated by decussating axons or by groups of neurons located along the midline of the brainstem. Our results suggest that these coordinating entities extend the length of the brainstem (in a rostro-caudal dimension) and the degree of contact rather than the location of the contact between the two halves of the brainstem determines the synchronization of the right and left halves. Burst frequency of both the intact and hemisected brainstem preparation was decreased by alkaline challenge and increased by acid challenge. We conclude that this endogeneous rhythmic activity represents the efferent motor output underlying lung ventilation in these animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192499
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    G2 arrest of cell cycle ensures a determination process of sensory mother cell formation in Drosophila (1997)
    Springer
    Development genes and evolution 207 (1997), S. 199-202 
    Details
    ISSN: 1432-041X
    Keywords: Key words Cell cycle ; Determination ; Sensory mother cell ; Cyclin A ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  In Drosophila, the sensory mother cells of macrochaetes are chosen from among the mitotically quiescent clusters of cells in wing imaginal discs, where other cells are proliferating. The pattern of cyclin A, one of the G2 cyclins, reveals that mitotically quiescent clusters of cells are arrested in G2. When precocious mitoses are induced during sensory mother cell determination by the ectopic expression of string, a known G2/M transition regulator, the formation of sensory mother cells is disturbed, resulting in the loss of macrochaetes in the adult notum. This suggests that G2 arrest of the cell cycle ensures the proper determination of sensory mother cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004270050108
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  • 4
    Electronic Resource
    Electronic Resource
    Feeding, reproductive and locomotor activities in diapausing and non-diapausing adults ofDrosophila (1995)
    Springer
    Ecological research 10 (1995), S. 87-93 
    Details
    ISSN: 1440-1703
    Keywords: diapause ; Drosophila ; feeding activity ; locomotor activity ; reproduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Feeding, reproductive and locomotor activities of fourDrosophila species were studied under short and long daylengths at 15°C. A short daylength induced firm reproductive diapause in experimental strains ofD. subauraria andD. triauraria from northern Japan, but very shallow diapause in those ofD. lutescens andD. rufa from southern Japan. A subtropical strain ofD. triauraria had no diapause. The influence of diapause on feeding activity was detected only in aged (〉 12 day old) females; that is, the feeding activity was lower in diapausing females than in non-diapausing ones. Females that do not produce eggs would not require so much energy. On the other hand, young adults of the study species exhibited a high feeding activity and rapidly increased bodyweight irrespective of sex and the diapause state. They would need nutrition to build up their adult body. In males, the feeding activity decreased with age irrespective of the diapause state. Males would not require so much energy for reproductive activity. Diapausing males became heavier than non-diapausing males, perhaps because they accumulated triacylglycerols in fat bodies. However, female bodyweight did not differ by the diapause state, perhaps because diapausing females accumulated triacylglycerols and reproducing females had eggs in their ovaries. InD. triauraria, diapausing individuals exhibited somewhat lower locomotor activity than non-diapausing ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347658
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