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  • Articles  (1,478,449)
  • 1990-1994  (1,478,449)
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  • 1
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    The European Macroseismic Scale 1992 : (up-dated MSK-scale) (1993)
    In:  Cahiers du Centre Européen de Géodynamique et de Séismologie ; 7
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    Publication Date: 2024-04-22
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/book
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  • 2
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    Dotterbloem en Waterviolier in Nederland (1993)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 19 no. 2, pp. 33-44
    Details
    Publication Date: 2024-04-02
    Description: Data from this century on the distribution of Caltha palustris and Hottonia palustris are used tot illustrate the role of volunteers in a monitoring scheme. Actual patterns in the distribution of the two species are discussed. About 40 percent of these data has been sampled by volunteers. It is demonstrated that both Caltha and Hottonia showed a decline in the period 1975—1989. In contrast to Caltha, the occurrence of Hottonia is strongly linked to areas with seapage water.
    Repository Name: National Museum of Natural History, Netherlands
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  • 3
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    A taxonomic revision of Willughbeia Roxb. (Apocynaceae) (1993)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 38 no. 1, pp. 1-24
    Details
    Publication Date: 2024-02-22
    Description: The genus Willughbeia Roxb. is revised. A total of 15 species are recognised. One new combination is made. Urnularia Stapf is reduced to synonymy within Willughbeia. Species exclusae have been given as well as an index of exsiccatae.
    Repository Name: National Museum of Natural History, Netherlands
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  • 4
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    A revision of Ichnocarpus (Apocynaceae) (1994)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 39 no. 1/2, pp. 73-94
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    Publication Date: 2024-02-22
    Description: The genus Ichnocarpus is revised. A total of 12 species are recognised, of which one new species is described. Three new combinations in Ichnocarpus and one in Anodendron are made. Micrechites and Lamechites are treated as synonyms of Ichnocarpus. Nomina nuda and species exclusae have been given as well as an index of exsiccatae.
    Repository Name: National Museum of Natural History, Netherlands
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  • 5
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    Biochemical systematics of the leaf mining moth family Nepticulidae (Lepidoptera). III. Allozyme variation patterns in the Ectoedemia subbimaculella group (1990)
    In:  Bijdragen tot de dierkunde vol. 60 no. 3/4, pp. 189-197
    Details
    Publication Date: 2024-02-22
    Description: Gel electrophoretic techniques were used to analyse patterns of variation at 12 genetic loci within and among species of the Ectoedemia subbimaculella group from western Europe. Geographically separated conspecific populations were similar to one another genetically, with the exception of E. subbimaculella where the malate dehydrogenase locus exhibited clinal variation. Genetic differences among species often concerned loci that were monomorphic or slightly polymorphic within populations. Three of the species could not be diagnosed by their allozyme content; allele distribution patterns at some loci suggest that speciation took place recently and did not involve a genetic bottleneck. Phylogenetic trees constructed from allozyme data paralleled closely the phylogeny based on morphology.
    Keywords: Allozyme variation ; biochemical genetics ; taxonomy ; speciation ; Insecta
    Repository Name: National Museum of Natural History, Netherlands
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  • 6
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    Zur Kenntnis der Mikrofossilien und Problematika aus der Lausitzer Grauwacke (Kamenzer Gruppe) (1990)
    In:  Veröffentlichungen des Museums der Westlausitz, Kamenz
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    Publication Date: 2024-02-16
    Keywords: 550 - Earth sciences
    Language: German
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  • 7
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    Die Grauwacken der Lausitz und ihre cadomische Prägung (1994)
    In:  Beiträge zur Geologie von Sachsen : Teil 2 | Abhandlungen des Staatlichen Museums für Mineralogie und Geologie zu Dresden
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    Publication Date: 2024-02-16
    Keywords: 550 - Earth sciences
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  • 8
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    Botanical Files on Lettuce (Lactuca sativa). On the chance for gene flow between wild and cultivated Lettuce (Lactuca sativa L. including L. serriola L., Compositae) and the generalized implications for risk-assessments on genetically modified plants (1994)
    In:  Gorteria. Supplement vol. 2 no. 1, pp. 1-44
    Details
    Publication Date: 2024-02-08
    Description: In Botanical Files, a study of the real chances for gene flow from cultivated plants to the wild a system of dispersal codes (Dpdf) was introduced (see text box Dpdf).\xc2\xb37 They are indications of already occurring gene flow from cultivated plants to the wild flora, as can be deduced from herbarium collections and florisdc archives. These codes apply to the Netherlands only.\nOne of the crops of which the real chances for gene flow could not be determined, because of uncertainties regarding the relationship between the cultivated plant and its wild relatives, is Lettuce (Lactuca sativa L.). Its relationship with the wild L. serriola L. is accepted to be very close, but the species are considered to be distinguishable. In a field trial, using 350 specimens from 67 genetically different populations, the distinction between the two species proved to depend largely on character states usually connected to domestication, like absence or presence of prickles, retention of achenes, leaf texture and colour.\nThe consequences are that both wild and cultivated lettuce must be considered to belong to the same species. The finding of some \xe2\x80\x98domesticated\xe2\x80\x99 character states in \xe2\x80\x98wild\xe2\x80\x99 lettuces indicates an already ongoing gene flow between cultivated lettuce and the wild flora, and the Dp(jf-code is adapted accordingly, indicating a substantial chance for gene flow from cultivated lettuce to its wild relative in the Netherlands.\nIf the scope of Dispersal codes as in Botanical Files is extended to Europe, European Dpdf-codes are needed. In this report a model is proposed using a plant geographical division of Europe into six vegetational regions. For each species six Dpdf-codes, summarizing the chances for gene flow to each of the regions, should be developed. For the major part of the species this can be done using the information already present in national herbarium collections.
    Repository Name: National Museum of Natural History, Netherlands
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  • 9
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    Botanical Files. A study of the real chances for spontaneous gene flow from cultivated plants to the wild flora of the Netherlands (1992)
    In:  Gorteria. Supplement vol. 1 no. 1, pp. 1-100
    Details
    Publication Date: 2024-02-08
    Description: Separate \xe2\x80\x98Botanical files\xe2\x80\x99 have been made for 42 species of cultivated plants. Each file gives information about the cultivated plant itself (use, origin, etc.), its wild relatives in the Netherlands, a report on actual hybridization and/or crossing (indicating gene flow by pollen), and observations on escapes from the field to nature (indicating gene flow by diaspores); the information is summarized to a conclusion and a numerical code, indicating the possible ecological effects of the cultivated plant on the wild flora of the Netherlands. This study was especially undertaken for questions regarding biosafety research on Genetically Modified Organisms (GMO\xe2\x80\x99s). The sources are the herbarium collections of the State Herbarium at Leiden, floristic archives and botanical literature, as well as expert judgment on the flora of the Netherlands and crop plants. An important consideration is that the absence of certain hybrids in the State Herbarium can be interpreted as a decisive indication that such a hybrid does not occur in the wild in the Netherlands. The botanical files show that in c. 50% of the cases no gene flow is expected; in c. 15% of the cases small, often local-scale effects are expected; in c. 25% of the cases considerable gene flow to the wild is expected; in c. 10% of the cases further research should be done before a definite conclusion can be drawn (most of the cases need further taxonomic research).
    Repository Name: National Museum of Natural History, Netherlands
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  • 10
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    Boekaankondigingen (1991)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 17 no. 3/4, pp. 72-72
    Details
    Publication Date: 2024-02-08
    Description: P. Bremer, Het Voorsterbos, over de ontwikkeling van flora en fauna, Zwolle, 1991, 116 pag., \xc6\x92 15, te bestellen via gironummer 3329375 t.n.v. P. Bremer, Zwolle. \xe2\x80\x94 Een gedetailleerd verslag over dit in de Noordoostpolder gelegen bos, met gegevens over Hogere planten, blad- en levermossen, lichenen, paddestoelen, vogels en andere diergroepen.\nP. Bremer, M.A. Heinen, A.J. Dijkstra & J. Brouwer, Flora en fauna van de Oldenzaalse stuwwal, Basisrapport Milieuinventarisatie, Provincie Overijssel, Zwolle, 1990, 216 pag., \xc6\x92 28,50, te bestellen via giro 833220 t.n.v. provincie Overijssel te Zwolle.
    Repository Name: National Museum of Natural History, Netherlands
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