Results 21 to 30 of about 2,921 (283)

Non-random distribution of microsatellite motifs and (TTAGGG)n repeats in the monkey frog Pithecopus rusticus (Anura, Phyllomedusidae) karyotype [PDF]

open access: yesGenetics and Molecular Biology, 2020
The monkey frog, Pithecopus rusticus (Anura, Phyllomedusidae) is endemic to the grasslands of the Araucarias Plateau, southern Brazil. This species is known only from a small population found at the type locality. Here, we analyzed for the first time the
Julia R. Ernetti   +4 more
doaj   +1 more source

Exfoliative Cytology in the Oral Mucosa of Patients with Fanconi Anaemia: A Morphometric Approach

open access: yesJournal of Dentistry Indonesia, 2017
Patients with Fanconi anaemia (FA) are prone to develop squamous cell carcinomas at an early age. Exfoliative cytology can be used to detect changes to the health of the oral mucosa.
Maria Angela Naval Machado   +5 more
doaj   +1 more source

Personal Perspectives on Plant Ribosomal RNA Genes Research: From Precursor-rRNA to Molecular Evolution

open access: yesFrontiers in Plant Science, 2021
The history of rDNA research started almost 90 years ago when the geneticist, Barbara McClintock observed that in interphase nuclei of maize the nucleolus was formed in association with a specific region normally located near the end of a chromosome ...
Vera Hemleben   +4 more
doaj   +1 more source

Chromosomal characterization of Hyla bischoffi and Hyla guentheri (Anura, Hylidae) [PDF]

open access: yesPhyllomedusa: Journal of Herpetology, 2004
Hyla bischoffi and H. guentheri share some morphological and call characters with the H. pulchella and H. polytaenia groups. The inclusion of these two species in one of these two groups is still controversial. This study showed that both species have 2n
Simone C. Raber   +4 more
doaj   +1 more source

Karyotype characterization, constitutive heterochromatin and nucleolus organizer regions of Paranaita opima (Coleoptera, Chrysomelidae, Alticinae)

open access: yesGenetics and Molecular Biology, 2006
Species of the subtribe Oedionychina not only have a highly uniform diploid number of 2n = 22 (20+X+y) but have the karyotypic peculiarity of possessing extremely large sex chromosomes.
Mara Cristina de Almeida   +2 more
doaj   +1 more source

Quantitative analysis of Argyrophilic Nucleolar organizer regions in odontogenic cysts and tumor – A comparative study

open access: yesJournal of Oral Biology and Craniofacial Research, 2018
Background: The nucleolar organizer region (NOR) is by definition part of a chromosome, and nucleolus is a structure containing this chromosomal part and in addition the material which accumulate around the NOR, mostly rRNAs and their precursors as well ...
Bhavana Gupta   +3 more
doaj   +1 more source

Cytogenetic characterization of Hypostomus nigromaculatus (Siluriformes: Loricariidae)

open access: yesNeotropical Ichthyology
Hypostomus is the most speciose genus in the family Loricariidae, with approximately 120 species. These fish show a wide morphological and color variation, which hinders the identification of species, mainly of widely distributed representatives. The aim
Marceléia Rubert   +2 more
doaj   +1 more source

Cytogenetic studies in four cultivated Amaranthus (Amaranthaceae) species

open access: yesComparative Cytogenetics, 2013
In the present study, the chromosomes numbers were confirmed, 2n = 34 for Amaranthus cruentus Linnaeus, 1759, and 2n = 32 for A. hypochondriacus Linnaeus, 1753, A. mantegazzianus Passer, 1864, and A. caudatus Linnaeus, 1753.
Marisa Bonasora   +2 more
doaj   +1 more source

Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, Brazil

open access: yesGenetics and Molecular Biology, 2006
Cytogenetic studies were performed on two sympatric species of Characidium, C. gomesi and C. cf. zebra, from the Grande River basin, Minas Gerais State, Brazil.
Alexandre Rodrigues da Silva   +1 more
doaj   +1 more source

Revisiting the polyploidy in the genus Odontophrynus (Anura: Odontophrynidae)

open access: yesActa Herpetologica, 2023
The genus Odontophrynus, composed of ten species, is found in practically the entire south of South America. Odontophrynus americanus was the first vertebrate registered to present natural polyploidy, considering that most individuals have 2N = 4x = 44 ...
André Luis de Souza   +3 more
doaj   +1 more source

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