leptotene

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Related to Leptonema: pachynema, zygonema

leptotene

(ˈlɛptəʊˌtiːn)
n
(Biochemistry) the first stage of the prophase of meiosis during which the nuclear material becomes resolved into slender single-stranded chromosomes
[C20: from lepto- + -tene, from Greek tainia band, filament]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.leptotene - the first stage of the prophase of meiosis
prophase - the first stage of meiosis
synapsis - the side by side pairing of homologous maternal and paternal chromosomes at the start of meiosis
phase, stage - any distinct time period in a sequence of events; "we are in a transitional stage in which many former ideas must be revised or rejected"
References in periodicals archive ?
Morphology of mouthparts and feeding habits of Leptonema and Smicridea (Trichoptera: Hydropsychidae) from Gaira river, Sierra Nevada de Santa Marta, Colombia.
La fauna de EPT en la SNSM esta conformada por generos sensibles a la degradacion del habitat y la calidad del agua como Mayobaetis, Lachlania, Anacroneuria, Pylloicus y Xiphocentron, asi como otros grupos de amplio espectro ambiental, entre ellos, Camelobaetidius, Baetodes, Leptonema, Smicridea y Atanatolica [3,41,54].
Familia Hydropsychidae: de distribucion mundial, con ocho generos presentes en Argentina, de estos, cinco estan representados en Misiones: Blepharopus, Leptonema, Macrostemun, Plectromacronema, Smicridea y Synoestropsis.
Psphenus, Thraulodes, Leptonema, Chimarra, and baetid mayflies were collected at six of the seven sites sampled (Table 3).
Con respecto a la composicion de macroinvertebrados (Figura 2), se obtuvo que 72 generos fueron compartidos por las dos quebradas, entre ellos Anacroneuria, Andesiops, Atopsyche, Baetodes, Camelobaetidius, Cricotopus, Cyphon, Elodes, Farrodes, Gigantodax, Heterelmis, Lachlania, Leptohyphes, Leptonema, Macrelmis, Polypedilum, Prebaetodes, Rheotanytarsus, Scirtes, Simulium, Smicridea, Stenelmis y Tipula.
1 PLECOPTERA: Anacroneuria Klapalek, 1909 66,7 38,5 Perlidae TRICHOPTERA Calamoceratidae Phylloicus Mueller, 1880 Glossosomatidae Culoptila Mosely, 1954 293,7 307,5 (4,71%) Protoptila Banks, 1904 Helicopsychidae Helicopsyche von Siebold, 1856 25,9 12,8 Hydrobiosidae Atopsyche Banks, 1905 13,9 5,6 Hydropsychidae Leptonema Guerin-Meneville, 1843 13,0 4,5 (4,73) Smicridea McLachlan, 1871 13,3 5,0 Hydroptilidae Hydroptila Dalman, 1819 22,2 0,0 Neotrichia Morton, 1905 Ochrotrichia Mosely, 1934 11,1 0,0 Oxyethira Eaton, 1873 Leptoceridae Grumichella Mueller, 1979 11,1 0,0 Nectopsyche sp2 Mueller, 1879 16,7 7,9 Oecetis McLachlan, 1877 11,1 0,0 Philopotamidae Chimarra Stephens, 1829 Xiphocentronidae Xiphocentron Brauer, 1870 11,1 0,0 SERIATA: Planariidae Planariidae Riqueza especifica 45 R.
En el Peru se han registrado 6 generos de esta familia: Centro-macronema, Leptonema, Macronema, Macrostemum, Smicridea y Synoestropsis.
Otros taxa significativos en este grupo dietario fueron Leptonema, Marilia, Triplectides y Tipulidae.
Real-time homogeneous assay of rapid cycle polymerase chain reaction product for identification of Leptonema illini.
Leptonema cfL Leptonema Lma Smicridea Smi Hydroptilidae Hydroptila Hyd Metrichia Met Leptoceridae Nectopsyche Nec Oecetis Oec Triplectides Tri Odontoceridae Marilia Mar Philopotamidae Chimarra Cra Polycentropodidae Polycentropus Pol Polyplectropus Pus Total de individuos (N) Completitud (Cn) % [sup.
5 7 0 Smicridea 2 3 Atanatolica 7 0 Hydropsychidae Leptonema 15 7 Hydroptilidae Hydroptila 5 0 Ochrotrichia 0 0 Helicopsychidae Helicopsyche 0 0 borealis Philopotamidae Chimarra 14 3 Odontoceridae Marilia 6 1 Calamoceratidae Phylloicus sp 0 0 Lepidoptera Pyralidae Eoparargyractis 0 0 1 0 Acari N.