Results 51 to 60 of about 6,081 (176)

Reevaluating introduced herbivores in conservation

Conservation Biology, Volume 40, Issue 5, October 2026.
Jonas Trepel, Robert Buitenwerf, Kristy Ferraro, Elizabeth le Roux, Erick Lundgren, Brian Maitner, Tanya Strydom, Jens‐Christian Svenning, Matthew R. Kerr   +8 more
wiley   +1 more source

Patterns of ribosomal DNA distribution in hylid frogs from the Hypsiboas faber and H. semilineatus species groups

Genetics and Molecular Biology, 2008
We performed a comparative analysis of the nucleolus organizer region (NOR) distribution in the karyotypes of hylid frogs from two different taxonomic groups, Hypsiboas faber and H. semilineatus. Silver nitrate staining of NORs (Ag-NORs) and fluorescence
Rosana dos Reis Abrante Nunes, Valéria Fagundes   +1 more
doaj  

Histomorfometria e histoquímica dos ovários, tubas e útero de ratas hipotireóideas em metaestro-diestro Histomorphometry and histochemistry of the ovaries, oviduct and uterus in hypothyroid rats in the metaestrus-diestrus

Arquivo Brasileiro de Medicina Veterinária e Zootecnia, 2004
A foliculogênese ovariana foi estudada em ratas adultas Wistar, hipotireóideas na fase de metaestro-diestro. O hipotireoidismo foi induzido pela administração oral e diária de propiltiouracil (1mg/animal). As ratas eutireóideas receberam placebo.
C.M. Silva, R. Serakides, T.S. Oliveira, N.M. Ocarino, E.F. Nascimento, V.A. Nunes   +5 more
doaj   +1 more source

Care Arrangements and Infant Development: The First Thousand Days Study in Santiago, Chile

Infancy, Volume 31, Issue 5, September/October 2026.
ABSTRACT This study draws on data from the Chilean Longitudinal First Thousand Days Study to examine early caregiving arrangements and their associations with developmental outcomes among 14‐month‐old children (n = 1161) in Santiago, Chile. We describe the types of care arrangements—parental, grandparental, relatives, center‐based, and non‐relatives—by
Marigen Narea, Camila Ayala, Felipe Godoy, Pamela Soto‐Ramirez   +3 more
wiley   +1 more source

Forord ved redaktøren og innholdsliste

Rangifer, 2013
NORs arbeidsutvalg vedtok i møte i Helsingfors 25. februar 1981 at det første forskermøte i NORs regi skulle vies temaet ”Tap av rein”. Som sted for møtet ble valgt Hemavan i Sverige. Konferansen samlet 38 deltakere. Hovedhensikten med konferansen var:
Sven Skjenneberg
doaj   +1 more source

Dynamic evolution and hierarchical regulation of rDNA in polyploid oat

The Plant Journal, Volume 127, Issue 6, September 2026.
SUMMARY Ribosomal DNA (rDNA) encodes the RNA core of ribosomes, yet it remains one of the least understood components of eukaryotic genomes, particularly in complex polyploids. Here, we present a comprehensive analysis of rDNA organization, evolution, and transcription across the Avena genus. We show that rDNA copy number varies extensively across loci
Ziyang Wan, Haorang Wang, Jie Qin, Wentao Ding, Xin Wang, Qianqian Ge, Handong Su   +6 more
wiley   +1 more source

Cytogenetic studies in three species of Lutjanus (Perciformes: Lutjanidae: Lutjaninae) from the Isla Margarita, Venezuela

Neotropical Ichthyology
In the present study, three species of Lutjaninae, Lutjanus analis, L. griseus and L. synagris, were analyzed by conventional Giemsa staining, C-banding and silver staining, to reveal active Nucleolus Organizer Regions (NORs).
Mauro Nirchio, Rodolfo Rondón, Claudio Oliveira, Irani A. Ferreira, Cesar Martins, Julio Pérez, Luciana Sola, Anna Rita Rossi   +7 more
doaj   +1 more source

Chromosome study in Schistocerca (Orthoptera-Acrididae-Cyrtacanthacridinae): karyotypes and distribution patterns of constitutive heterochromatin and nucleolus organizer regions (NORs)

Genetics and Molecular Biology, 2007
Chromosome analyses were performed in two grasshopper species of the genus Schistocerca, S. pallens and S. flavofasciata. Both species shared the same diploid number (2n = 23, X in males; 2n = 24, XX in females);and a conserved karyotype composed ...
Maria José de Souza, Natoniel Franklin de Melo   +1 more
doaj   +1 more source

Silver-negative NORs in Pamphagus ortolaniae (Orthoptera: Pamphagidae)

European Journal of Entomology, 2008
The present paper reports some cytogenetic peculiarities observed in the Ag-NORs of Pamphagus ortolaniae chromosomes, the unusual behaviour of ribosomal sites after silver staining and the intense Ag-positive reaction of centromeric regions at ...
Roberto VITTURI, Antonella LANNINO, Caterina MANSUETO, Valentina MANSUETO, Mariastella COLOMBA   +4 more
doaj   +1 more source

Number and location of rDNA clusters in the superfamilies Tenthredinoidea and Cynipoidea (Hymenoptera): an update [PDF]

Comparative Cytogenetics
To identify nucleolus organizing regions (NORs), fluorescence in situ hybridization (FISH) with 18S rDNA probe was performed on chromosomes of Tenthredo campestris Linnaeus, 1758 (Tenthredinidae), Arge ciliaris (Linnaeus, 1767) (Argidae) (n = 10 in both)
Vladimir E. Gokhman, Valentina G. Kuznetsova, Boris A. Anokhin   +2 more
doaj   +3 more sources