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  • 1
    Electronic Resource
    Electronic Resource
    Amino acid incorporation by isolated oocytes of the marine teleost Blennius pholis L. (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 14 (1979), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The uptake of a labelled amino acid, tritiated leucine, by isolated oocytes of Blennius pholis L. is described. Uptake related to protein and RNA synthesis is distinguished by the use of two metabolic inhibitors. An endogenous contribution to the protein yolk is indicated but this may undergo turnover with time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1979.tb03545.x
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  • 2
    Electronic Resource
    Electronic Resource
    Protein yolk synthesis in Blennius pholis L. (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 13 (1978), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Acrylamide gel electrophoresis indicates the presence of a group of proteins in the blood serum and liver of the female fish which are probably responsible for the accumulation of the proteid yolk in the ovary. Immunological tests confirm that these high molecular weight proteins are the protein yolk precursors synthesized in the female liver and transported by the blood serum to the ovary where they accumulate in the developing oocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1978.tb03425.x
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  • 3
    Electronic Resource
    Electronic Resource
    A sterile sea water circulating system for the jar culture of developing fish eggs (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 12 (1978), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A sterile sea water circulating system for the jar culture of developing fish eggs is described. An ultra–violet filter unit is used to sterilise the water and the system is one of a double-circulation the advantages of which are discussed. This is an effective method for maintaining the developing embryos of Blennius pholis L. under controlled conditions, and would be applicable to studies on other demersal fish species or marine organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1978.tb04169.x
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of the parasitoid Diaeretiella rapae on the feeding rate of its host Brevicoryne brassicae (1979)
    Springer
    Entomologia experimentalis et applicata 25 (1979), S. 9-15 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Der Einfluss der Parasitierung durch den Parasitoiden Diaeretiella rapae auf die Futteraufnahme von Brevicoryne brassicae wurde mit Hilfe ausgeschnittener, mit Radiophosphor behandelter Blätter studiert. Während der ersten Phase, wenn das Ei und die Embryonalstadien des Parasitoiden vorhanden sind, bleibt die Futteraufnahme unverändert. Dagegen fällt sie auf ein gesicher niedrigeres Niveau als bei nichtparasitierten Blattläusen während des ersten Larvenstadiums des Parasitoiden (48 h). Dies ist eine Folge der aktiven Futteraufnahme des Parasitoiden. Während des zweiten Larvenstadiums des Parasitoiden steigt die Futteraufnahme des Wirts wieder an und zwar auf das Niveau nichtparasitierter Blattläuse. Das zweite Larvenstadium des Parasitoiden ist ein Ruhestadium und ernährt sich von flüssigen und halbflüssigen Nährstoffen. Während des dritten Larvenstadiums des Parasitoiden fällt die Futteraufnahme des Wirts und der Tod tritt während des vierten Larvenstadiums des Parasitoiden ein.
    Notes: Abstract The food uptake by Brevicoryne brassicae, as measured by accumulation of radiophosphorus, is influenced by the presence of developing larvae of the parasitoid Diaeretiella rapae. Though the egg and embryonic stages of the parasitoid have no effect on host feeding the presence of a first-instar larva lowers the food uptake. Feeding returns to a level similar to that of non-parasitised aphids when a second-instar parasitoid is present within a host, but drops again when the third instar is reached. Host death occurs during the fourth-larval instar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421812
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  • 5
    Electronic Resource
    Electronic Resource
    Egg development and the reproductive cycle in the pycnogonid Endeis laevis (1975)
    Springer
    Marine biology 33 (1975), S. 331-339 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Endeis laevis (Grube) is the more littoral of the two British members of the Endeidae (Pycnogonida). The process of vitellogenesis is examined. It closely resembles that of annelids and Limulus polyphemus, in which the majority of the yolk is synthesised within the oocyte with only a small contribution from outside the oocyte. This contrasts with the method in insects in which most of the yolk comes from outside the oocyte. The vitellogenic process is slow, the eggs accumulating yolk over the winter. Although E. laevis has two reproductive cycles each year, only one brood is produced, juveniles occurring over a restricted period (July and early August).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390571
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  • 6
    Electronic Resource
    Electronic Resource
    Shoot and embryo-like structure formation from cultured tissues of Sorghum bicolor (1977)
    Springer
    Naturwissenschaften 64 (1977), S. 587-587 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00450647
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  • 7
    Electronic Resource
    Electronic Resource
    Direct pollination of Zea mays ovules in vitro with Z. mays, Z. mexicana and Sorghum bicolor pollen (1978)
    Springer
    Theoretical and applied genetics 53 (1978), S. 43-46 
    Details
    ISSN: 1432-2242
    Keywords: Direct ovule pollination in vitro ; Embryo and endosperm development in vitro ; Hyperplastic nucellar growth ; In vitro pollination ; Sorghum ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sorghum (Sorghum bicolor) pollen tubes penetrated and grew in corn (Zea mays) styles. The limited length of the sorghum pollen tubes (3–5 mm) and the absence of stigmatic hairs on the basal (5–10 mm) section of the corn styles prevented effective pollination in vivo and in vitro. Normal fertilisation occurred after in vitro pollination of exposed corn ovules with either corn or teosinte (Zea mexicana) pollen. Six per cent of corn ovules pollinated directly with sorghum pollen responded by rapid, massive growth of nucellar tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00273135
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  • 8
    Electronic Resource
    Electronic Resource
    Biochemical selection of immature, haploid embryos of Zea mays L. (1979)
    Springer
    Theoretical and applied genetics 55 (1979), S. 257-262 
    Details
    ISSN: 1432-2242
    Keywords: Biochemical selection ; Zea mays ; Haploid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A method was devised for the biochemical selection of immature, haploid Zea mays embryos using Adh1 − and either the Stock 6 or indeterminate gametophyte (ig in W23) high haploid-inducing systems. Haploid (Adh1 −) embryos survived exposure to levels of allyl alcohol which killed diploid (Adh1 +/Adh1 −) embryos. Of the total surviving embryos which were examined cytologically 15% (using ig) and 22% (using Stock 6) were haploid. In two experiments with Stock 6, 100% of the surviving embryos were haploid. To obtain maximum effectiveness of Stock 6 and ig, Adh1 − was transferred to stock 6 and W23 backgrounds. Immature, haploid embryos are being used to develop haploid, morphogenic tissue cultures of Zea mays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265362
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  • 9
    Electronic Resource
    Electronic Resource
    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
    Keywords: Rectal papilla ; Insects ; Hymenoptera ; Cell Types ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220008
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  • 10
    Electronic Resource
    Electronic Resource
    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
    Keywords: Insects ; Mid-gut ; Aging ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221085
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