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	Provedor de dados Biol. Res. (2) Phyton (1) Autor Ayarza,Eliana (1) Berríos,Soledad (1) Fernández–Donoso,Raúl (1) Ivanova,Julia L (1) Ivlev,Yuri F (1) Karajan,Bella P (1) Leonova,Olga G (1) Liu,DH (1) Popenko,Vladimir I (1) Skarlato,Sergei O (1) Wang,QL (1) Yue,JY (1) Mais... Palavra-chave Nucleoli (3) 3D reconstruction (1) Allium cepa var. agrogarum L (1) Autophagy (1) Cadmium (Cd) (1) Chromosome aberration (1) Ciliates (1) Electron microscopy (1) Macronucleus (1) Mouse spermatocytes (1) Nuclear architecture (1) Nucleolar organizing region (1) Quadrivalents (1) Robertsonian chromosomes (1) Mais... Tipo do documento Journal article (2) Info:eu-repo/semantics/article (1) Ano 2017 (1) 2016 (1) 2013 (1) País Chile (2) Argentina (1) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Quantitative analysis of nucleolar chromatin distribution in the complex convoluted nucleoli of Didinium nasutum (Ciliophora) Biol. Res. Leonova,Olga G; Karajan,Bella P; Ivlev,Yuri F; Ivanova,Julia L; Skarlato,Sergei O; Popenko,Vladimir I. We have earlier shown that the typical Didinium nasutum nucleolus is a complex convoluted branched domain, comprising a dense fibrillar component located at the periphery of the nucleolus and a granular component located in the central part. Here our main interest was to study quantitatively the spatial distribution of nucleolar chromatin structures in these convoluted nucleoli. There are no "classical" fibrillar centers in D.nasutum nucleoli. The spatial distribution of nucleolar chromatin bodies, which play the role of nucleolar organizers in the macronucleus of D.nasutum, was studied using 3D reconstructions based on serial ultrathin sections. The relative number of nucleolar chromatin bodies was determined in macronuclei of recently fed, starved... Tipo: Journal article Palavras-chave: 3D reconstruction; Ciliates; Electron microscopy; Macronucleus; Nucleoli. Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000100010 Synaptic configuration of quadrivalents and their association with the XY bivalent in spermatocytes of Robertsonian heterozygotes of Mus domesticus Biol. Res. Berríos,Soledad; Fernández–Donoso,Raúl; Ayarza,Eliana. Abstract Background The nuclear architecture of meiotic prophase spermatocytes is based on higher–order patterns of spatial associations among chromosomal domains and consequently is prone to modification by chromosomal rearrangements. We have shown that nuclear architecture is modified in spermatocytes of Robertsonian (Rb) homozygotes of Mus domesticus. In this study we analyse the synaptic configuration of the quadrivalents formed in the meiotic pro– phase of spermatocytes of mice double heterozygotes for the dependent Rb chromosomes: Rbs 11.16 and 16.17. Results Electron microscope spreads of 60 pachytene spermatocytes from four animals of Mus domesticus 2n = 38 were studied and their respective quadrivalents analysed in detail.... Tipo: Journal article Palavras-chave: Quadrivalents; Robertsonian chromosomes; Mouse spermatocytes; Nucleoli; Nuclear architecture. Ano: 2017 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100405 The uptake of cadmium by Allium cepa var. agrogarum L. and its effects on chromosome and nucleolar behavior in root tip cells Phyton Wang,QL; Liu,DH; Yue,JY. Allium cepa var. agrogarum L. seedlings are sensitive to Cd stress. We used fluorescence imaging to indicate that Cd2+ was localized in cytoplasm in the epidermis of the basal parts of root and vascular tissues after Cd treatment. The nucleoli and the cell walls were the first storage sites of Cd2+. When Cd exposure was prolonged, severe irregularly-shaped nuclei were induced. We used silver nitrate staining to analyze the effects of different concentrations (1-300 µM) of cadmium chloride on chromosome, nucleolus and nucleolus organizer regions (NORs) in root tip cells. Cd2+ induced c-mitosis, chromosome bridges, chromosome stickiness and micronuclei. More than 100 µM Cd2+ could induce nucleolar material extruded from the nucleus into the cytoplasm. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Cadmium (Cd); Allium cepa var. agrogarum L; Chromosome aberration; Nucleoli; Nucleolar organizing region; Autophagy. Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100021 Registros recuperados: 3 Primeira ... 1 ... Última

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