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  • 1
    Electronic Resource
    Electronic Resource
    Hepatitis C virus-associated oral lichen planus: is the geographical heterogeneity related to HLA-DR6? (2005)
    Oxford, UK : Munksgaard International Publishers
    Journal of oral pathology & medicine 34 (2005), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background:  The association between hepatitis C virus (HCV) and oral lichen planus (OLP) is more common in the Mediterranean area and Japan, possibly because of immunogenetic factors.Methods:  Intermediate-resolution HLA-DRB typing by hybridization with oligonucleotide probes was performed in 31 Italian OLP patients with HCV infection, in 45 Italian OLP and in 48 British OLP patients without HCV infection. As healthy controls we included data from 145 unrelated Italian and 101 unrelated British bone marrow donors.Results:  Italian HCV+ve OLP patients possessed the HLA-DR6 allele more frequently than Italian and British OLP patients without HCV infection (51.6% vs. 17.7% vs. 16.7%; P corrected = 0.028 and 0.017, respectively). There was no difference in the frequency of the HLA-DR6 allele between Italian and British control subjects.Conclusions:  The present data suggest that HLA-DR6 may be responsible for the peculiar geographic heterogeneity of the association between HCV and OLP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.2005.00303.x
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  • 2
    Electronic Resource
    Electronic Resource
    Two new members in the Contracaecum osculatum complex (nematoda, ascaridoidea) from the antarctic
    Amsterdam : Elsevier
    International Journal for Parasitology 24 (1994), S. 367-377 
    Details
    ISSN: 0020-7519
    Keywords: Antarctic Ocean ; Ascaridoid nematodes ; Atlantic Arctic-Boreal region ; Contracaecum osculatum complex ; allozymic diagnostic keys ; gene flow ; genetic distance ; genetic relationships ; genetic variation ; multilocus electrophoresis ; reproductive isolation ; sibling species
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0020-7519(94)90084-1
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  • 3
    Electronic Resource
    Electronic Resource
    Gene variation and gene flow inOrchis morio (Orchidaceae) from Italy (1992)
    Springer
    Plant systematics and evolution 179 (1992), S. 43-58 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Orchidaceae ; Orchis morio subsp.morio ; O. morio subsp.picta ; O. longicornu ; Multilocus electrophoresis ; genetic variation ; gene flow ; morphology ; Flora of Italy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Data are presented on genetic variation at 27 enzyme loci of the Green-Winged orchid,Orchis morio, in 18 population samples from Italy. The existence in Italy of two subspecies, i.e. subspp.morio andpicta, is not supported by allozyme data. No genetic heterogeneity was found betweenmorio-like andpicta-like samples and specimens. Moreover, morphological transition between the two forms was observed in different Italian populations. The parameters of genetic variability estimated forO. morio populations are consistent with those found among monocotyledon plants, and among those outcrossing, animal-pollinated and with wind-dispersed seeds. Genetic diversity of ItalianO. morio is mostly within populations. Correspondingly, low values of interpopulational genetic distance were found. This appears to be due to high levels of gene flow, which were estimated with different methods. The lack ofO. longicornu from Italian samples, as well as of any hybrid withO. morio (F1, backcrossed or recombinant individuals) is demonstrated on the basis of genetic data. It is concluded that recurrent reports ofO. longicornu from Italy are due to confusion withO. morio or with otherOrchis species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00938018
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  • 4
    Electronic Resource
    Electronic Resource
    Isozyme variation and taxonomic rank of Contracaecum radiatum (v. Linstow, 1907) from the Antarctic Ocean (Nematoda, Ascaridoidea) (1995)
    Springer
    Systematic parasitology 30 (1995), S. 1-9 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Genetic variation of the Antarctic anisakid Contracaecum radiatum from the Ross and Weddell Seas is studied at 24 enzyme loci. All polymorphic loci proved to be in Hardy-Weinberg equilibrium, with no significant differences between the samples tested. Several loci were found to be diagnostic between C. radiatum and the five known members of the C. osculatum complex, indicating that no gene exchange occurs between them and confirming their specific status. No F1 hybrids, recombinant or introgressed individuals, sharing radiatum and osculatum alleles, were detected in the Antarctic Contracaecum samples; this directly proves the reproductive isolation of C. radiatum. Biochemical keys are given for the identification of Antarctic C. radiatum, C. osculatum D and E, both for adults (males and females) and larvae. Higher values of genetic variability were observed in these Antarctic Contracaecum species than in the Arctic-Boreal C. osculatum members, possibly related to a lower degree of habitat disturbance (i.e. by pollution, fishing and hunting) in the Antarctic region. On the basis of genetic distances, the evolutionary divergence between C. radiatum and C. osculatum (sensu lato) started about 5 million years ago, possibly with the first colonisation of the Antarctic region by seals. Data on paratenic (fish) and definitive (seal) hosts of C. radiatum and C. osculatum D and E are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009238
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