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Faria,Karina de Cassia; Morielle-Versute,Eliana. |
The purpose of this work was to verify the ability of the enzyme Alu I to cleave and/or remove satellite DNA sequences from heterochromatic regions in chromosomes of bats, by identifying the occurrence of modifications in the pattern of fluorescence in situ hybridization with telomeric DNA. The localization and fluorescence intensity of the telomeric DNA sites of the Alu-digested and undigested chromosomes of species Eumops glaucinus, Carollia perspicillata, and Platyrrhinus lineatus were analyzed. Telomeric sequences were detected at the termini of chromosomes of all three species, although, in C. perspicillata, the signals were very faint or absent in most chromosomes. This finding was interpreted as being due to a reduced number of copies of the... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AluI; FISH; Chiroptera; Telomeric sites; DAPI. |
Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000400003 |
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GALLARDO-ESCÁRATE,CRISTIAN; ÁLVAREZ-BORREGO,JOSUÉ; VON BRAND,ELISABETH; DUPRÉ,ENRIQUE; DEL RÍO-PORTILLA,MIGUEL ÁNGEL. |
In observations by confocal or conventional fluorescence microscopy, important factors should be considered in order to obtain accurate images. One of them, such as the fluorescence bleaching from highest intensity to lowest signal of fluorescence is a common problem with several DNA fluorochromes and especially for DAPI stain. The fluorescence of DAPI fades rapidly when it is exposed to UV light, under optimal conditions of observation. Although the fading process can be retarded using a mounting medium with antifading reagents, the photochemical process underlying the fluorescence decay has not yet been fully explained. In addition, no relationship between fluorescence fading and nuclear DNA content has been tested. In order to test this relationship, we... |
Tipo: Journal article |
Palavras-chave: Nuclear DNA content; Fluorescence fading; Image analysis; DAPI. |
Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000100004 |
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Labory,Cláudia Regina Gontijo; Dias,Eustáquio Souza; Davide,Lisete Chamma; Schawan,Rosane Freitas; Wenzel,Inajá Marchizeli. |
Com o objetivo de se estudar o comportamento nuclear durante o ciclo sexual do cogumelo Agaricus blazei , técnicas de coloração e a utilização de fluorocromos foram testadas, visando a uma padronização metodológica para estudos citogenéticos futuros. Das técnicas avaliadas neste trabalho (método de Feulgen, coloração com Giemsa e fluorescência-DAPI), a coloração com Giemsa e o fluorocromo DAPI apresentaram os melhores resultados para evidenciar núcleos. O corante Giemsa permitiu a visualização de compartimentos multinucleados. Com o DAPI, não foi possível a visualização dos septos, sendo necessária a utilização adicional de calcofluor, que tem a propriedade de corar a quitina que delimita os compartimentos das hifas. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agaricus blazei; Giemsa; DAPI; Calcofluor; Citogenética. |
Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542003000200030 |
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