The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
A G Papeschi - One of the best experts on this subject based on the ideXlab platform.
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meiotic studies in Largus rufipennis castelnau largidae heteroptera ii reciprocal translocation heterozygosity
Caryologia, 1998Co-Authors: L M Mola, A G Papeschi, Maria Jose Bressa, Marcelo L LarramendyAbstract:SUMMARYSpecimens of Largus rufipennis (Castelnau) (Largidae, Heteroptera) from three different populations from Argentina (Itaembe, Misiones Province; Tornquist and Ciudad Universitaria, Buenos Aires Province) were cytogenetically studied. Meiotic characteristics of these populations are compared with previous reports on the species. In the population from Itaembe, heterozygosity for a reciprocal translocation was encountered; this finding is the first report for this type of chromosome rearrangement in the order Heteroptera. The role of reciprocal translocations in karyotype evolution in organisms with holokinetic chromosomes is analyzed and discussed.
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meiotic studies in Largus rufipennis castelnau largidae heteroptera frequency and behaviour of ring bivalents univalents and b chromosomes
Heredity, 1993Co-Authors: L M Mola, A G PapeschiAbstract:Meiotic studies in Largus rufipennis (Castelnau) (Largidae, Heteroptera): frequency and behaviour of ring bivalents, univalents and B chromosomes
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Meiotic studies in Largus rufipennis (Castelnau) (Largidae, Heteroptera): frequency and behaviour of ring bivalents, univalents and B chromosomes
Heredity, 1993Co-Authors: L M Mola, A G PapeschiAbstract:Cytogenetic analysis of an Argentine population of Largus rufipennis has revealed the presence of autosomal univalents and a supernumerary chromosome. All individuals present univalents at a variable frequency (0.31–21.83 per cent), and half of them carry a B chromosome at low frequency. Both the B chromosome and univalents divide equationally at anaphase I and reductionally at the second division. The present population is very heterogeneous with respect to chiasma frequency and distribution: desynapsis is responsible for the appearance of univalents, while the presence of the B chromosome is associated with an increase in chiasma frequency. However, two individuals that lack the supernumerary chromosome show a strikingly high chiasma frequency. This variation in chiasma frequency should be the result of the interaction between genes controlling chiasmata and the environmental conditions (both internal and external) together with the genetic background of each individual.
L M Mola - One of the best experts on this subject based on the ideXlab platform.
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meiotic studies in Largus rufipennis castelnau largidae heteroptera ii reciprocal translocation heterozygosity
Caryologia, 1998Co-Authors: L M Mola, A G Papeschi, Maria Jose Bressa, Marcelo L LarramendyAbstract:SUMMARYSpecimens of Largus rufipennis (Castelnau) (Largidae, Heteroptera) from three different populations from Argentina (Itaembe, Misiones Province; Tornquist and Ciudad Universitaria, Buenos Aires Province) were cytogenetically studied. Meiotic characteristics of these populations are compared with previous reports on the species. In the population from Itaembe, heterozygosity for a reciprocal translocation was encountered; this finding is the first report for this type of chromosome rearrangement in the order Heteroptera. The role of reciprocal translocations in karyotype evolution in organisms with holokinetic chromosomes is analyzed and discussed.
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meiotic studies in Largus rufipennis castelnau largidae heteroptera frequency and behaviour of ring bivalents univalents and b chromosomes
Heredity, 1993Co-Authors: L M Mola, A G PapeschiAbstract:Meiotic studies in Largus rufipennis (Castelnau) (Largidae, Heteroptera): frequency and behaviour of ring bivalents, univalents and B chromosomes
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Meiotic studies in Largus rufipennis (Castelnau) (Largidae, Heteroptera): frequency and behaviour of ring bivalents, univalents and B chromosomes
Heredity, 1993Co-Authors: L M Mola, A G PapeschiAbstract:Cytogenetic analysis of an Argentine population of Largus rufipennis has revealed the presence of autosomal univalents and a supernumerary chromosome. All individuals present univalents at a variable frequency (0.31–21.83 per cent), and half of them carry a B chromosome at low frequency. Both the B chromosome and univalents divide equationally at anaphase I and reductionally at the second division. The present population is very heterogeneous with respect to chiasma frequency and distribution: desynapsis is responsible for the appearance of univalents, while the presence of the B chromosome is associated with an increase in chiasma frequency. However, two individuals that lack the supernumerary chromosome show a strikingly high chiasma frequency. This variation in chiasma frequency should be the result of the interaction between genes controlling chiasmata and the environmental conditions (both internal and external) together with the genetic background of each individual.
Katerina Kousoulaki - One of the best experts on this subject based on the ideXlab platform.
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Efficacy of 2-phenoxyethanol as an anaesthetic for two size classes of white sea bream, Diplodus sargus L., and sharp snout sea bream, Diplodus puntazzo C.
Aquaculture, 2006Co-Authors: H. Tsantilas, A. D. Galatos, N. N. Prassinos, F Athanassopoulou, Katerina KousoulakiAbstract:The objective of this study was to evaluate the efficacy of 2-phenoxyethanol as an anaesthetic for two size classes of white sea bream, Diplodus sargus L. (30 and 60 g), and sharp snout sea bream, Diplodus puntazzo C., (15 and 30 g) and establish the minimum concentration producing desirable anaesthetic effects on them. Fish were exposed to concentrations varying from 0.1 to 0.4 mL/L for a 60-min period. At concentrations of 0.1, 0.117 and 0.133 mL/L, 2-phenoxyethanol failed to induce anaesthesia, whereas at concentrations of 0.167, 0.2, 0.3 and 0.4 mL/L all the fish were anaesthetised within 3 min of exposure. However, mortality was observed with the two higher concentrations. Induction time decreased and recovery time increased with increasing concentrations, being significantly concentration-dependent in both species (P ≤ 0.01). Following exposure of D. sargus to concentrations of 0.2 or 0.3 mL/L, both induction and recovery time were significantly weight-dependent (P ≤ 0.01). However, erratic weight dependencies of both induction and recovery time were observed in D. puntazzo. 2-Phenoxyethanol proved to be an effective and safe anaesthetic in both species permitting rapid and uneventful induction and recovery after a 60-min exposure period. The minimum concentration producing desirable anaesthetic effects was 0.167 mL/L. © 2005 Elsevier B.V. All rights reserved.
Reinhold Kärcher - One of the best experts on this subject based on the ideXlab platform.
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Resurrection of Cortinarius coalescens: taxonomy, chemistry, and ecology
Mycological Progress, 2017Co-Authors: Jan Borovička, Simone Braeuer, Anna Žigová, Milan Gryndler, Bálint Dima, Walter Goessler, Tobias G. Frøslev, Jan Kameník, Reinhold KärcherAbstract:Cortinarius coalescens Kärcher & Seibt is a rare European species of the subgenus Phlegmacium , section Phlegmacioides , neglected in recent molecular studies. New primers (CortF and CortR) designed for species in the section Phlegmacioides allowed to obtain ITS rDNA sequence data from the holotype collection of C. coalescens ; according to the results, this epithet has priority over C. crassorum Rob. Henry ex Rob. Henry, C. pardinus Reumaux, and C. parargutus Bidaud, Moënne-Locc. & Reumaux. Morphological and ecological observations on recent collections of C. coalescens from the Czech Republic in comparison with the co-occurring C. Largus are discussed. Nomenclatural and taxonomic comments on C. tomentosus Rob. Henry, C. balteatotomentosus Rob. Henry, and C. subtomentosus Reumaux are also provided. So far, C. coalescens is known with certainty from Germany, France, and the Czech Republic, where it grows in deciduous forests on acid to neutral soils. Arsenic and its compounds were determined in C. coalescens and related species of the section Phlegmacioides : C. Largus , C. pseudodaulnoyae , and C. variecolor . Total arsenic concentrations were in the range 3.6–30.2 mg kg^−1 (dry matter) and arsenobetaine was the major arsenic compound.
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Resurrection of Cortinarius coalescens : taxonomy, chemistry, and ecology
Mycological Progress, 2017Co-Authors: Jan Borovička, Simone Braeuer, Anna Žigová, Milan Gryndler, Bálint Dima, Walter Goessler, Tobias G. Frøslev, Jan Kameník, Reinhold KärcherAbstract:Cortinarius coalescens Karcher & Seibt is a rare European species of the subgenus Phlegmacium, section Phlegmacioides, neglected in recent molecular studies. New primers (CortF and CortR) designed for species in the section Phlegmacioides allowed to obtain ITS rDNA sequence data from the holotype collection of C. coalescens; according to the results, this epithet has priority over C. crassorum Rob. Henry ex Rob. Henry, C. pardinus Reumaux, and C. parargutus Bidaud, Moenne-Locc. & Reumaux. Morphological and ecological observations on recent collections of C. coalescens from the Czech Republic in comparison with the co-occurring C. Largus are discussed. Nomenclatural and taxonomic comments on C. tomentosus Rob. Henry, C. balteatotomentosus Rob. Henry, and C. subtomentosus Reumaux are also provided. So far, C. coalescens is known with certainty from Germany, France, and the Czech Republic, where it grows in deciduous forests on acid to neutral soils. Arsenic and its compounds were determined in C. coalescens and related species of the section Phlegmacioides: C. Largus, C. pseudodaulnoyae, and C. variecolor. Total arsenic concentrations were in the range 3.6–30.2 mg kg−1 (dry matter) and arsenobetaine was the major arsenic compound.
Giovanni Danna - One of the best experts on this subject based on the ideXlab platform.
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diel activity and variability in habitat use of white sea bream in a temperate marine protected area
Marine Environmental Research, 2016Co-Authors: Manfredi Di Lorenzo, Tomas Vega Fernandez, Fabio Badalamenti, Paolo Guidetti, Richard M Starr, V M Giacalone, Antonio Di Franco, Giovanni DannaAbstract:Abstract Fish populations are often comprised of individuals that use habitats and associated resources in different ways. We placed sonic transmitters in, and tracked movements of, white sea bream ( Diplodus sargus sargus ) in the no-take zone of a Mediterranean marine protected area: the Torre Guaceto marine protected area, (Adriatic Sea, Italy). Tagged fish displayed three types of diel activity patterns in three different habitats: sand, rocky reefs and “matte” of the seagrass Posidonia oceanica . Individuals were more active during the day than at night. Overall, white sea bream displayed a remarkable behavioural plasticity in habitat use. Our results indicate that the observed behavioural plasticity in the marine protected area could be the result of multiple ecological and environmental drivers such as size, sex and increased intra-specific competition. Our findings support the view that habitat diversity helps support high densities of fishes.
