The cellular architecture of the female gonoduct of 68 nematode populations representing 42 speci... more The cellular architecture of the female gonoduct of 68 nematode populations representing 42 species belonging to Tylenchidae, Belonolaimidae, Hoplolaimidae and Meloinema is shown to have an overall similarity in cellular gonoduct structure. The oviduct consists of two rows of four cells; the spermatheca is comprised of 10 to 20 cells, and the uterus cells, except in the case of Psilenchus, are arranged in four (Tylenchidae) or three (Belonolaimidae, Hoplolaimidae and Meloinema) regular rows. Although the genus Meloinema is classified within Meloidogynidae, its spermatheca is clearly hoplolaimid-like and lacks the spherical shape with lobe-like protruding cells typical of Meloidogyne. Detailed morphology of expelled gonoducts may provide a valuable character set in phylogenetic analysis, and the cellular morphology of the spermatheca appears to be a distinguishing feature at species level, especially in the genera Tylenchus and Geocenamus. Ultrastructural data on the oviduct-spermath...
Organisms living in extreme habitats require costly adaptations to cope with these conditions. Am... more Organisms living in extreme habitats require costly adaptations to cope with these conditions. Among the suggested potential benefits that trade off these costs is refuge from predation. To study these interactions in extreme environments, samples were taken in the cave Cueva de Villa Luz, Tabasco, Mexico, where more than 32 subterranean springs, some H(2)S rich, rise from the floor. Hydrogen sulfide gas plus oxygen is absorbed by freshwater, and oxidation forms concentrated sulfuric acid. Snottites, whitish hollow mucous tubes, hang from the ceiling of the cave. Fluid drops from these snottites were recorded as having pH values of 0-3. We report the discovery of a new species of nematode that thrives in the highly acidic environment of the snottite. Micro CT scan of snottites reveals a complex interaction between the acidic snottite, nematodes, and abundant nematode-eating mites. The nematode adaptation to low pH probably protects them against mite predation, for which nematodes ar...
Several strains of microorganisms and relevant bio-markers were embedded within a Mars analog reg... more Several strains of microorganisms and relevant bio-markers were embedded within a Mars analog regolith, exposed to 41 days of diurnal martian conditions, and sampled with respect to depth for viable cell counts and extent of organic matter oxidation.
Microorganism and relevant biomarkers were exposed to several weeks of simulated martian conditio... more Microorganism and relevant biomarkers were exposed to several weeks of simulated martian conditions while embedded within a synthetic Mars analog regolith. Survival of organisms and biomarkers was related to burial depth and UV exposure with time.
Filenchus fungivorus n. sp., isolated from autumn bellflower (Gentiana scrabra Bunge) in Japan an... more Filenchus fungivorus n. sp., isolated from autumn bellflower (Gentiana scrabra Bunge) in Japan and maintained on a fungus culture, is described based on LM, SEM and molecular data. The new species is characterised by combination of the following features: two lateral lines, short body (284-331 μm), short stylet (7.0-8.7 μm), amphid aperture associated with characteristic depression, short ovary, undifferentiated spermatheca, post-vulval sac shorter than corresponding body diam. and short (59-80 μm) non-filiform, almost straight tail and absence of males. According to a principal component analysis, a small tail/vulva-anus (1.3-1.8) and V′ ratio have the highest morphometrical power to separate F. fungivorus n. sp. from the remaining analysed Filenchus spp. (with the exception of F. misellus). Molecular analyses based on SSU rDNA placed F. fungivorus n. sp. within a clade that contained Filenchus sp. (heathland, Belgium), F. (Ottolenchus) discrepans, Malenchus andrassyi and F. misell...
Gonads from living young females, belonging to 15 Meloidogyne species and 80 other species, were ... more Gonads from living young females, belonging to 15 Meloidogyne species and 80 other species, were extruded to study the cellular structure of the female genital structure. Within the genus Meloidogyne, the spermatheca is always spherical and formed by a variable ...
Since first described, acoels were considered members of the flatworms (Platyhelminthes). However... more Since first described, acoels were considered members of the flatworms (Platyhelminthes). However, no clear synapomorphies among the three large flatworm taxa -- the Catenulida, the Acoelomorpha and the Rhabditophora -- have been characterized to date. Molecular phylogenies, on the other hand, commonly positioned acoels separate from other flatworms. Accordingly, our own multi-locus phylogenetic analysis using 43 genes and 23 animal species places the acoel flatworm Isodiametra pulchra at the base of all Bilateria, distant from other flatworms. By contrast, novel data on the distribution and proliferation of stem cells and the specific mode of epidermal replacement constitute a strong synapomorphy for the Acoela plus the major group of flatworms, the Rhabditophora. The expression of a piwi-like gene not only in gonadal, but also in adult somatic stem cells is another unique feature among bilaterians. These two independent stem-cell-related characters put the Acoela into the Platyhel...
... Please use this identifier to cite or link to this item: Record Details. Record ID, 534323. R... more ... Please use this identifier to cite or link to this item: Record Details. Record ID, 534323. Record Type, conference. Author, Wim Bert [801001095652] - Ghent University Wim.Bert@UGent.be; Frédérik Leliaert [801001131321] - Ghent University Frederik.Leliaert@UGent.be; ...
... Please use this identifier to cite or link to this item: Record Details. Record ID, 525519. R... more ... Please use this identifier to cite or link to this item: Record Details. Record ID, 525519. Record Type, conference. Author, Yves Meyvis [801001929347] - Ghent University Yves.Meyvis@UGent. be; Wouter Houthoofd [801001607732] - Ghent University Wouter.Houthoofd@UGent.be ...
Diversity studies of South African deep groundwater environments revealed diverse microbial commu... more Diversity studies of South African deep groundwater environments revealed diverse microbial communities with a variety of metabolic capabilities. These analyses has always been represented by grab samples and correlated to geochemical parameters. Monitoring a single borehole over an extended period of time mimics work done at other deep sampling sites. Access was secured at a borehole in a diamond mine that allowed for not only monitoring microbial diversity over an extended period of time but also cartridges with solid matrixes allowed for in situ biofilm development to describe the biomes in their natural geochemical environment (up to 40 meters). The samples were retrieved and preserved for analysis, where diversity shifts can be correlated to previous samplings, chemistry determined of the fissure water and employing classical molecular methods but also pyrotagging as well as metagenomics will reveal more on microbial diversity and metabolic adaptability. The biofilm was allowed...
abstract Composting is the heat-producing, aerobe disintegration of organic materials by several ... more abstract Composting is the heat-producing, aerobe disintegration of organic materials by several organisms which form a complex and fast changing community. Up to now only the dynamics of the bacterial community have been thoroughly investigated in relation to composting processes. This research focuses on the taxonomical composition and the succession of the nematode community during the composting process. Nematodes show several characteristics which make them ideal bio-indicators to analyze the ecosystem ...
abstract Composting is the heat-producing, aerobe disintegration of organic materials by several ... more abstract Composting is the heat-producing, aerobe disintegration of organic materials by several organisms which form a complex and fast changing community. Until now only the dynamics of the bacterial community has been thoroughly investigated in relation to decomposing processes. This research focuses on the taxonomical composition and the succession of the nematode community during the composting process. Nematodes show several characteristics which make them ideal bio-indicators to analyze the ecosystem ...
The cellular architecture of the female gonoduct of 68 nematode populations representing 42 speci... more The cellular architecture of the female gonoduct of 68 nematode populations representing 42 species belonging to Tylenchidae, Belonolaimidae, Hoplolaimidae and Meloinema is shown to have an overall similarity in cellular gonoduct structure. The oviduct consists of two rows of four cells; the spermatheca is comprised of 10 to 20 cells, and the uterus cells, except in the case of Psilenchus, are arranged in four (Tylenchidae) or three (Belonolaimidae, Hoplolaimidae and Meloinema) regular rows. Although the genus Meloinema is classified within Meloidogynidae, its spermatheca is clearly hoplolaimid-like and lacks the spherical shape with lobe-like protruding cells typical of Meloidogyne. Detailed morphology of expelled gonoducts may provide a valuable character set in phylogenetic analysis, and the cellular morphology of the spermatheca appears to be a distinguishing feature at species level, especially in the genera Tylenchus and Geocenamus. Ultrastructural data on the oviduct-spermath...
Organisms living in extreme habitats require costly adaptations to cope with these conditions. Am... more Organisms living in extreme habitats require costly adaptations to cope with these conditions. Among the suggested potential benefits that trade off these costs is refuge from predation. To study these interactions in extreme environments, samples were taken in the cave Cueva de Villa Luz, Tabasco, Mexico, where more than 32 subterranean springs, some H(2)S rich, rise from the floor. Hydrogen sulfide gas plus oxygen is absorbed by freshwater, and oxidation forms concentrated sulfuric acid. Snottites, whitish hollow mucous tubes, hang from the ceiling of the cave. Fluid drops from these snottites were recorded as having pH values of 0-3. We report the discovery of a new species of nematode that thrives in the highly acidic environment of the snottite. Micro CT scan of snottites reveals a complex interaction between the acidic snottite, nematodes, and abundant nematode-eating mites. The nematode adaptation to low pH probably protects them against mite predation, for which nematodes ar...
Several strains of microorganisms and relevant bio-markers were embedded within a Mars analog reg... more Several strains of microorganisms and relevant bio-markers were embedded within a Mars analog regolith, exposed to 41 days of diurnal martian conditions, and sampled with respect to depth for viable cell counts and extent of organic matter oxidation.
Microorganism and relevant biomarkers were exposed to several weeks of simulated martian conditio... more Microorganism and relevant biomarkers were exposed to several weeks of simulated martian conditions while embedded within a synthetic Mars analog regolith. Survival of organisms and biomarkers was related to burial depth and UV exposure with time.
Filenchus fungivorus n. sp., isolated from autumn bellflower (Gentiana scrabra Bunge) in Japan an... more Filenchus fungivorus n. sp., isolated from autumn bellflower (Gentiana scrabra Bunge) in Japan and maintained on a fungus culture, is described based on LM, SEM and molecular data. The new species is characterised by combination of the following features: two lateral lines, short body (284-331 μm), short stylet (7.0-8.7 μm), amphid aperture associated with characteristic depression, short ovary, undifferentiated spermatheca, post-vulval sac shorter than corresponding body diam. and short (59-80 μm) non-filiform, almost straight tail and absence of males. According to a principal component analysis, a small tail/vulva-anus (1.3-1.8) and V′ ratio have the highest morphometrical power to separate F. fungivorus n. sp. from the remaining analysed Filenchus spp. (with the exception of F. misellus). Molecular analyses based on SSU rDNA placed F. fungivorus n. sp. within a clade that contained Filenchus sp. (heathland, Belgium), F. (Ottolenchus) discrepans, Malenchus andrassyi and F. misell...
Gonads from living young females, belonging to 15 Meloidogyne species and 80 other species, were ... more Gonads from living young females, belonging to 15 Meloidogyne species and 80 other species, were extruded to study the cellular structure of the female genital structure. Within the genus Meloidogyne, the spermatheca is always spherical and formed by a variable ...
Since first described, acoels were considered members of the flatworms (Platyhelminthes). However... more Since first described, acoels were considered members of the flatworms (Platyhelminthes). However, no clear synapomorphies among the three large flatworm taxa -- the Catenulida, the Acoelomorpha and the Rhabditophora -- have been characterized to date. Molecular phylogenies, on the other hand, commonly positioned acoels separate from other flatworms. Accordingly, our own multi-locus phylogenetic analysis using 43 genes and 23 animal species places the acoel flatworm Isodiametra pulchra at the base of all Bilateria, distant from other flatworms. By contrast, novel data on the distribution and proliferation of stem cells and the specific mode of epidermal replacement constitute a strong synapomorphy for the Acoela plus the major group of flatworms, the Rhabditophora. The expression of a piwi-like gene not only in gonadal, but also in adult somatic stem cells is another unique feature among bilaterians. These two independent stem-cell-related characters put the Acoela into the Platyhel...
... Please use this identifier to cite or link to this item: Record Details. Record ID, 534323. R... more ... Please use this identifier to cite or link to this item: Record Details. Record ID, 534323. Record Type, conference. Author, Wim Bert [801001095652] - Ghent University Wim.Bert@UGent.be; Frédérik Leliaert [801001131321] - Ghent University Frederik.Leliaert@UGent.be; ...
... Please use this identifier to cite or link to this item: Record Details. Record ID, 525519. R... more ... Please use this identifier to cite or link to this item: Record Details. Record ID, 525519. Record Type, conference. Author, Yves Meyvis [801001929347] - Ghent University Yves.Meyvis@UGent. be; Wouter Houthoofd [801001607732] - Ghent University Wouter.Houthoofd@UGent.be ...
Diversity studies of South African deep groundwater environments revealed diverse microbial commu... more Diversity studies of South African deep groundwater environments revealed diverse microbial communities with a variety of metabolic capabilities. These analyses has always been represented by grab samples and correlated to geochemical parameters. Monitoring a single borehole over an extended period of time mimics work done at other deep sampling sites. Access was secured at a borehole in a diamond mine that allowed for not only monitoring microbial diversity over an extended period of time but also cartridges with solid matrixes allowed for in situ biofilm development to describe the biomes in their natural geochemical environment (up to 40 meters). The samples were retrieved and preserved for analysis, where diversity shifts can be correlated to previous samplings, chemistry determined of the fissure water and employing classical molecular methods but also pyrotagging as well as metagenomics will reveal more on microbial diversity and metabolic adaptability. The biofilm was allowed...
abstract Composting is the heat-producing, aerobe disintegration of organic materials by several ... more abstract Composting is the heat-producing, aerobe disintegration of organic materials by several organisms which form a complex and fast changing community. Up to now only the dynamics of the bacterial community have been thoroughly investigated in relation to composting processes. This research focuses on the taxonomical composition and the succession of the nematode community during the composting process. Nematodes show several characteristics which make them ideal bio-indicators to analyze the ecosystem ...
abstract Composting is the heat-producing, aerobe disintegration of organic materials by several ... more abstract Composting is the heat-producing, aerobe disintegration of organic materials by several organisms which form a complex and fast changing community. Until now only the dynamics of the bacterial community has been thoroughly investigated in relation to decomposing processes. This research focuses on the taxonomical composition and the succession of the nematode community during the composting process. Nematodes show several characteristics which make them ideal bio-indicators to analyze the ecosystem ...
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