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  • Ultrastructure  (5)
  • Hymenopteran  (2)
  • 1
    Digitale Medien
    Digitale Medien
    The ultrastructure of oösorption in Locusta migratoria migratorioides (1972)
    Springer
    Cell & tissue research 135 (1972), S. 275-286 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Oöcyte ; Resorption ; Locust ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The changes in the ultrastructure of the oöcyte and associated follicle cells during oösorption in Locusta migratoria migratoroides are described. Throughout the process the follicle cells act in a phagocytic manner and invade the oöplasm. Localizatio of acid phosphatase activity indicates that at the start of resorption the Golgi complexes of the follicle cells begin to produce lysosomes on a large scale, and that these are utilised in the breakdown of yolk spheres which have been taken up from the oöcyte. Partly degraded yolk spheres are collected together along with other cell organelles into cytolysomes. The significance of large numbers of microtubules within the follicle cells and of microvillar borders between the cells in late stage resorbing bodies is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00315130
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The structure of the rectal papilla in a parasitoid hymenopteran Nasonia vitripennis (Walker) (Hymenoptera Pteromalidae) (1975)
    Springer
    Cell & tissue research 161 (1975), S. 413-419 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Rectal papilla ; Insects ; Hymenoptera ; Cell Types ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The ultrastructure of the rectal papillae of the parasitoid hymenopteran, Nasonia vitripennis (Walk), is described. These organs in this insect consist of four distinct cell types arranged as a closed, hollow cone. The majority of the cells are present in the raised cone, and are characterised by large numbers of mitochondria arranged in a membranous labyrinth. A series of cells form a collar around the base of the cone. Junction cells have been identified which are present at the point of insertion of the cone into the rectal epithelium. The base of the cone consists of cells with elaborately folded plasma membranes facing both the central cavity of the cone, and the haemolymph. The structure of this rectal papilla is compared with those found in other insects.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00220008
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    The effect of age on the ultrastructure of the mid-gut cells of the hymenopteran Nasonia vitripennis (Walk.) (Hymenoptera, Pteromalidae) (1977)
    Springer
    Cell & tissue research 177 (1977), S. 239-245 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Insects ; Mid-gut ; Aging ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The ultrastructure of the mid-gut cells of aged female Nasonia vitripennis is described. The mid-gut is a shrunken and distorted organ in the aged animal. The individual cells are highly disorganised and the organelle components are altered. The small lipid droplets formed in the apical cell region do not coalesce to form the large central lipid inclusions characteristic of the young animal. The rough endoplasmic reticulum is reduced and some of the mitochondria enlarge. The mid- and apical cell regions also contain large numbers of cytolysosomes. The basal cell region is essentially unchanged, but the channels formed by the infolded basal plasma membranes are dilated. The changes observed are discussed in relation to previous observations on other insect species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00221085
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    The ultrastructure of the mid-gut cells of Nasonia vitripennis (Walker) (Hymenoptera, Pteromalidae) (1977)
    Springer
    Cell & tissue research 177 (1977), S. 227-238 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Insects ; Nasonia vitripennis ; Mid-gut ; Morphometry ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The ultrastructure of the mid-gut cells of female Nasonia vitripennis is described. The mid-gut consists of a uniform, single-cell epithelium. The cells of different gut regions were analysed using morphometric techniques in order to determine any differences in the components. The structure of the cells is described in the unfed animal, and after varying periods of feeding on host body-fluids. Tissues were sampled after 12 h and 24 h of feeding on host body-fluids and after 24 h feeding/24 h starvation. The cells were found to be complex and contain an organelle component that allows solute-transport and extensive lipid synthesis. A limited cytochemical analysis involving the lysosomal marker enzyme-acid phosphatase — and the respiratory enzyme — cytochrome oxidase was carried out.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00221084
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    The formation of “accessory nuclei” in the developing oöcytes of the parasitoid hymenopterans Ophion luteus (L.) and Apanteles glomeratus (L.) (1970)
    Springer
    Cell & tissue research 109 (1970), S. 158-170 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Accessory nuclei ; Hymenopteran ; Oöcytes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The appearance and subsequent distribution of accessory nuclei in the developing oöcytes of the Ichneumonoid Ophion luteus and Braconid Apanteles glomeratus is described. They are produced by a folding of annulate lamellae produced from the nuclear envelope. The nucleus and accessory nuclei give rise to other annulate lamellae by two distinct modes of budding. These organelles are involved in membrane formation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00365238
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Oögenesis in a braconid, Apanteles glomeratus (L.) possessing an hydropic type of egg (1971)
    Springer
    Cell & tissue research 119 (1971), S. 43-57 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Oögenesis ; Hymenopteran ; Hydropic egg
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary 1. Oögenesis in a braconid parasitoid Apanteles glomeratus (L.) is described and compared with that in other hymenoptera. 2. The processes are similar, except that there is no uptake of protein for yolk formation with the associated configurations in the follicle cells and the periphery of the oöcyte.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00330537
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Oögenesis in a marine teleost, Blennius pholis L. (1977)
    Springer
    Cell & tissue research 181 (1977), S. 105-128 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Oöcyte ; Oögenesis ; Teleost ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Oögenesis in the oviparous marine teleost, Blennius pholis L., is examined. Eleven developmental stages are identified by ultrastructural observations when changes in the distributions of the organelles and inclusions are described. An exogenous source for the protein yolk precursors is indicated, but less clear is the endogenous contribution. Changes in the follicle epithelium are described together with the formation of the zona which is considered to be follicular in origin. Two types of follicle cell are distinguished and these probably function differently in the process of zona formation. The zona becomes divided into the externa and interna, the latter probably resulting from the chemical ordering by disulphide bonding of the proteinaceous material of the former.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00222778
    Standort Signatur Erwartet Verfügbarkeit
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