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  • Adult maturation Schistocerca gregaria  (1)
  • Bioelectric currents  (1)
  • Insect oviduct  (1)
  • Lipid metabolism  (1)
  • Oncopeltus fasciatus (Insecta, Heteroptera)  (1)
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  • 1
    ISSN: 0965-1748
    Keywords: Adult maturation Schistocerca gregaria ; Diacylglycerols ; Lipid metabolism ; Phase polymorphism ; Triacylglycerols
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9071
    Keywords: Insect oviduct ; larval-adult transformation ; juvenile hormone ; Oncopeltus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary It has been tested whether juvenile hormone plays a role in the larval-adult transformation of lateral oviducts in the milkweed bug. The transformation is ecdysteroid-dependent, as was reported previously2. Application of precocene or juvenile hormone III proved that the absence of juvenile hormone is required.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 113 (1982), S. 89-96 
    ISSN: 1615-6102
    Keywords: Bioelectric currents ; Extracellular current measurements ; Vibrating probe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This paper summarizes the fundamentals and describes advances in the vibrating probe, a tool that was developed and introduced into biological research byJaffe andNuccitelli in 1974. The improvements reported are concerned on the one hand with the construction, micropositioning and maintenance of the probe itself and, on the other hand, with the origin of artifacts and possible ways to avoid or, at least, to detect and monitor them. The advances in construction and the elucidation of possible artifacts may help extend the usefulness of this unique tool in investigations of ionic currents which cells and tissues drive through themselves during development and movement.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0878
    Keywords: Ecdysial glands ; Ecdysone ; Embryos, larvae ; Oncopeltus fasciatus (Insecta, Heteroptera) ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Active prothoracic glands and oenocytes of last larval stage are both characteristized by well-developed smooth and rough endoplasmic reticulum (ER). Prothoracic glands also show plasma membrane infoldings, but not oenocytes which contain a large number of pleomorphic vesicles. 2. The fine structure of embryonic oenocytes corresponds after blastokinesis with that of active larval and adult cells. Thus, an activity in the late embryo can be assumed. Embryonic prothoracic glands reveal no signs of activity: smooth and rough ER are absent. The subcellular structure resembles that of organ anlagen, i.e. not yet fully differentiated tissue. Hormone synthesis is not likely. 3. Ecdysone titer was determined throughout embryonic development and in mature adults. Although prothoracic glands break down during adult ecdysis, imagines contain in the Calliphora-bioassay active factors: females 0.9 CU/g and males 0.5 CU/g. As sites of synthesis the oenocytes are suggested. 4. A relatively high ecdysone titer of 7 CU/g is measured in newly deposited eggs. The hormone is presumably of maternal origin. Subsequent to blastokinesis the hormone content increases dramatically up to about 180 CU/g, apparently due to endocrine function of the embryo. Oenocytes are proposed as the source of ecdysone during late embryonic development. 5. The function of ecdysone during early and advanced embryogenesis, especially in view of “embryonic molts”, is discussed.
    Type of Medium: Electronic Resource
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