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  • 1
    Electronic Resource
    Electronic Resource
    The ultrastructure of the wreath cells ofDrosophila melanogaster larvae (1967)
    Springer
    Protoplasma 63 (1967), S. 343-352 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01252944
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  • 2
    Electronic Resource
    Electronic Resource
    The comparative submicroscopic morphology of the ring gland of Drosophila melanogaster during the second and third larval instars (1966)
    Springer
    Cell & tissue research 73 (1966), S. 272-285 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A description is given of the ultrastucture of the ring gland of late second and late third instar larvae of Drosophila melanogaster. The organ contains tissues of four types: (1) corpus allatum cells, (2) prothoracic gland cells, (3) corpus cardiacum cells, and (4) tracheal cells. Axons bearing spherical neurosecretory granules pass from the corpus cardiacum to the corpus allatum. Ecdysone and juvenile hormone are thought to be manufactured by smooth surfaced endoplasmic reticulum contained in the prothoracic gland cell and the corpus allatum cell, respectively. The morphology of these cells at the two developmental stages studied suggests that the switch over from larval to pupal development is preceded during the third larval stage by an increasing hormone secretion by the prothoracic gland cells and a decreasing secretion by the cells of the corpus allatum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334868
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  • 3
    Electronic Resource
    Electronic Resource
    The development of the female Drosophila reproductive system (1968)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 124 (1968), S. 143-165 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Light and electron microscopical studies allow a descriptive account to be given of the preadult development of the ovary of Drosophila melanogaster. The lineage of the cell groups which contribute to the tissues of the adult ovary has been determined. The earliest morphologically detectable event in the differeentiation of each ovariole is the formation during the larval period of its terminal filament. Oogonia play no role in the induction of terminal filaments. The developmental events which transform a spherical mass of ovarian cells into a collection of multicellular cylinders is described. The importance in morphogenesis of acellular membranes secreted at the interface separting cells of different prospective significances is stressed. Such membranes may serve to regulate the future migration of cell populations or as sites of attachment for monolayers of cells which later fuse to form multinucleated muscle sheaths. The transformation of oogonia to cystoblasts coincides with and presumably depends upon the same hormonal stimulus which causes metamorphosis. The first oocytes to undergo crossing over do so between 24 and 36 hours after puparium formation.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051240203
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  • 4
    Electronic Resource
    Electronic Resource
    Morphological and histochemical studies on oogenesis in Callosobruchus analis Fabr. (Bruchidae-Coleoptera) (1967)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 122 (1967), S. 19-33 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The ovary in Callosobruchus analis consists of telotrophic ovarioles with the so called nurse cells confined to one chamber at the anterior end of the ovariole. There are three types of lipids in the ovary: (1) L1 bodies that are present in the early oocytes, in the posterior prefollicular tissue and in the follicular epithelium and contain unsaturated phospholipids; (2) L2 bodies that have a complete or incomplete sheath of phospholipids and a triglyceride core; (3) L3 bodies that are formed of highly saturated triglycerides. Lipids are absent from the trophic tissue. In a mature oocyte the L1 and L2 bodies are cortical in distribution while the L3 bodies are centrally located.The mitochondria contain lipoproteins with RNA. The yolk spheres are acid mucopolysaccharides and protein in nature. The precursors of the yolk spheres appear first in the cortical coplasm and are absent from the follicular epithelium or the trophic tissue. The nucleolus of the oocyte shows evidence of extrusions that are believed to pass into the ooplasm.There are no nutritive cords connecting the trophic tissue to the oocytes; nor is there any evidence of any histochemically demonstrable nutritive material being contributed to the oocyte by the trophic tissue. The circumstantial evidence points towards a contribution of the raw materials to the oocyte by the haemolymph either through or in between the follicular epithelium in some soluble form or as submicroscopic particles.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051220103
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  • 5
    Electronic Resource
    Electronic Resource
    An electron microscopic study of the corpus cardiacum of adult Drosophila melanogaster and its afferent nerves (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 134 (1971), S. 437-445 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The left and right afferent nerves to the corpus cardiacum contain approximately 50 and 90 axons, respectively, when they enter the gland. Both bifurcate within the gland, so that four nerves leave the corpus cardiacum. These, however, contain a total of 90 axons. Of the 50 axons unaccounted for 30 are believed to terminate in the corpus cardiacum and 20 in the corpus allatum. The corpus cardiacum contains 12 intrinsic neurosecretory cells which are disposed laterally with respect to the extrinsic axons. Many of these contain neurosecretory spheres and presumably originate in the brain. The intrinsic corpus cardiacum cells also contain neurosecretory granules, and they produce short cytoplasmic processes which interdigitate with the extrinsic axons.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051340405
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  • 6
    Electronic Resource
    Electronic Resource
    A comparative study of the ring glands from wild type and 1(2)gl mutant Drosophila melanogaster (1969)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 129 (1969), S. 171-199 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Drosophila melanogaster homozygous for the second chromosomal, recessive lethal gene 1(2)gl form puparia much later than wild type (+) and are unable to metamorphose. Implantation of + ring glands accelerates puparium formation by 1(2)gl hosts. The ring gland is a compound structure containing the prothoracic glands (pg), corpus allatum (ca), and corpus cardiacum (cc). An electron microscopic study demonstrates that in both the pg and ca the most common subcellular component is smooth surfaced endoplasmic reticulum (ser). In + flies the amount of ser per pg increases by ten times during the four hour prepupal period. In 1(2)gl flies which have spent two days in the prepupal period the pg looks juvenile and contains only 1% the amount of ser per cell found in the + prepupal pg. The ca cells look alike in both + and 1(2)gl individuals, and the cortical cells of the cc in both contain abundant neurosecretory spheres. We suggest that the + allele of 1(2)gl indirectly influences the synthesis of ser by the pg and that this is the site where dietary cholesterol is transformed to ecdysone.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051290204
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  • 7
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    The comparative submicroscopic morphology of the ring gland of Drosophila melanogaster during the second and third larval instars (1966)
    Springer
    Details
    Publication Date: 1966-01-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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